Settings

* env var prefix

* tag-service workflow

.circleci/config.yml

@@ -16,6 +16,8 @@ workflows:
           # <regex path-to-test> <parameter-to-set> <value-of-pipeline-parameter>
           mapping: |
             op-conductor-mon/.* run-build-op-conductor-mon true
+            op-signer/.* run-build-op-signer true
+            op-txproxy/.* run-build-op-txproxy true
             op-ufm/.* run-build-op-ufm true
             proxyd/.* run-build-proxyd true
             .circleci/.* run-all true

.circleci/continue_config.yml

@@ -10,6 +10,12 @@ parameters:
   run-build-op-conductor-mon:
     type: boolean
     default: false
+  run-build-op-signer:
+    type: boolean
+    default: false
+  run-build-op-txproxy:
+    type: boolean
+    default: false
   run-build-op-ufm:
     type: boolean
     default: false
@@ -76,6 +82,7 @@ jobs:
           command: |
             echo "Configuration Results:"
             echo "run-build-op-conductor-mon: << pipeline.parameters.run-build-op-conductor-mon >>"
+            echo "run-build-op-signer: << pipeline.parameters.run-build-op-signer >>"
             echo "run-build-op-ufm: << pipeline.parameters.run-build-op-ufm >>"
             echo "run-build-proxyd: << pipeline.parameters.run-build-proxyd >>"
             echo "run-all: << pipeline.parameters.run-all >>"
@@ -100,6 +107,12 @@ jobs:
               echo "op-conductor-mon tag regex match: false"
             fi
 
+            if [[ $CURRENT_TAG =~ ^op-signer/v.* ]]; then
+              echo "op-signer tag regex match: true"
+            else
+              echo "op-signer tag regex match: false"
+            fi
+
             if [[ $CURRENT_TAG =~ ^op-ufm/v.* ]]; then
               echo "op-ufm tag regex match: true"
             else
@@ -408,6 +421,38 @@ workflows:
           docker_name: op-conductor-mon
           docker_tags: <<pipeline.git.revision>>,<<pipeline.git.branch>>
           docker_context: .
+  op-signer:
+    when:
+      or: [<< pipeline.parameters.run-build-op-signer >>, << pipeline.parameters.run-all >>]
+    jobs:
+      - go-lint:
+          name: op-signer-lint
+          module: op-signer
+      - go-test:
+          name: op-signer-tests
+          module: op-signer
+      - docker-build:
+          name: op-signer-docker-build
+          docker_file: op-signer/Dockerfile
+          docker_name: op-signer
+          docker_tags: <<pipeline.git.revision>>,<<pipeline.git.branch>>
+          docker_context: .
+  op-txproxy:
+    when:
+      or: [<< pipeline.parameters.run-build-op-txproxy >>, << pipeline.parameters.run-all >>]
+    jobs:
+      - go-lint:
+          name: op-txproxy-lint
+          module: op-txproxy
+      - go-test:
+          name: op-txproxy-tests
+          module: op-txproxy
+      - docker-build:
+          name: op-txproxy-docker-build
+          docker_file: op-txproxy/Dockerfile
+          docker_name: op-txproxy
+          docker_tags: <<pipeline.git.revision>>,<<pipeline.git.branch>>
+          docker_context: .
   op-ufm:
     when:
       or: [<< pipeline.parameters.run-build-op-ufm >>, << pipeline.parameters.run-all >>]
@@ -455,6 +500,41 @@ workflows:
               only: /^(proxyd|ufm-[a-z0-9\-]*|op-[a-z0-9\-]*)\/v.*/
             branches:
               ignore: /.*/
+      - docker-build:
+          name: op-signer-docker-build
+          filters:
+            tags:
+              only: /^op-signer\/v.*/
+          docker_name: op-signer
+          docker_tags: <<pipeline.git.revision>>
+          docker_context: .
+          docker_file: op-signer/Dockerfile
+          context:
+            - oplabs-gcr-release
+          requires:
+            - hold
+      - docker-publish:
+          name: op-signer-docker-publish
+          filters:
+            tags:
+              only: /^op-signer\/v.*/
+          docker_name: op-signer
+          docker_tags: <<pipeline.git.revision>>
+          context:
+            - oplabs-gcr-release
+          requires:
+            - op-signer-docker-build
+      - docker-tag-op-stack-release:
+          name: op-signer-docker-tag
+          filters:
+            tags:
+              only: /^op-signer\/v.*/
+            branches:
+              ignore: /.*/
+          context:
+            - oplabs-gcr-release
+          requires:
+            - op-signer-docker-publish
       - docker-build:
           name: op-ufm-docker-build
           filters:
@@ -470,6 +550,9 @@ workflows:
             - hold
       - docker-publish:
           name: op-ufm-docker-publish
+          filters:
+            tags:
+              only: /^op-ufm\/v.*/
           docker_name: op-ufm
           docker_tags: <<pipeline.git.revision>>
           context:
@@ -477,7 +560,7 @@ workflows:
           requires:
             - op-ufm-docker-build
       - docker-tag-op-stack-release:
-          name: docker-tag-op-ufm-release
+          name: op-ufm-docker-tag
           filters:
             tags:
               only: /^op-ufm\/v.*/
@@ -501,7 +584,7 @@ workflows:
           requires:
             - hold
       - docker-publish:
-          name: proxyd-docker-release
+          name: proxyd-docker-publish
           filters:
             tags:
               only: /^proxyd\/v.*/
@@ -512,7 +595,7 @@ workflows:
           requires:
             - proxyd-docker-build
       - docker-tag-op-stack-release:
-          name: docker-tag-op-stack-release
+          name: proxyd-docker-tag
           filters:
             tags:
               only: /^proxyd\/v.*/
@@ -521,7 +604,7 @@ workflows:
           context:
             - oplabs-gcr-release
           requires:
-            - proxyd-docker-release
+            - proxyd-docker-publish
       - docker-build:
           name: op-conductor-mon-docker-build
           filters:
@@ -537,6 +620,9 @@ workflows:
             - hold
       - docker-publish:
           name: op-conductor-mon-docker-publish
+          filters:
+            tags:
+              only: /^op-conductor-mon\/v.*/
           docker_name: op-conductor-mon
           docker_tags: <<pipeline.git.revision>>,<<pipeline.git.branch>>
           context:
@@ -544,7 +630,7 @@ workflows:
           requires:
             - op-conductor-mon-docker-build
       - docker-tag-op-stack-release:
-          name: docker-tag-op-stack-release
+          name: op-conductor-mon-docker-tag
           filters:
             tags:
               only: /^op-conductor-mon\/v.*/

.github/CODEOWNERS

@@ -1 +1,3 @@
 * @ethereum-optimism/infra-reviewers
+
+/op-txproxy @ethereum-optimism/devxpod

.github/workflows/tag-service.yml

@@ -1,5 +1,8 @@
 name: Tag Service
 
+permissions:
+  contents: write
+
 on:
   workflow_dispatch:
     inputs:
@@ -18,7 +21,9 @@ on:
         required: true
         type: choice
         options:
+          - op-signer
           - op-ufm
+          - op-txproxy
           - proxyd
       prerelease:
         description: Increment major/minor/patch as prerelease?

README.md

@@ -4,4 +4,5 @@ This repository is an extension of the [Optimism monorepo](https://github.com/et
 
 ## Components
 - op-conductor-mon: Monitors multiple op-conductor instances and provides a unified interface for reporting metrics.
+- op-signer: Thin gateway that supports `eth_signTransaction` RPC endpoint to sign ethereum tx payloads using private key stored in KMS
 - op-ufm: User facing monitoring creates transactions at regular intervals and observe transaction propagation across different RPC providers.

op-conductor-ops/README.md

@@ -0,0 +1,51 @@
+# op-conductor-ops
+
+op-conductor-ops is a CLI tool for managing op-conductor sequencer clusters.
+
+**WARNING!!! This tool can cause a network outage if used improperly. Please consult #pod-devinfra before using.**
+
+## Setup
+
+Requires [poetry](https://github.com/python-poetry/poetry).
+
+Install python dependencies with `poetry install`.
+
+Recommended updates to your .bashrc/zshrc:
+
+1. `export PATH="export PATH="<path-to-infra-repo>/op-conductor-ops:$PATH""`
+2. `export CONDUCTOR_CONFIG="<path-to-op-conductor-ops-config.toml>"`
+
+## Usage
+
+After installing dependencies with `poetry`, the tool can be invoked with `./op-conductor-ops`,
+which just calls `poetry run python main.py` and passes on any arguments.
+
+### Example Usage
+
+* Example usage with implicit config file with lookup at ./config.toml
+```./op-conductor-ops status <network-name>```
+
+* Usage with explicit path to config and certificate
+```./op-conductor-ops  -c ./<path>/config.toml --cert ./<path>/cacert.pem  <command> <network-name>```
+
+## Example Configuration File: example.config.toml
+
+This configuration file is used to set up the networks and sequencers for your application.
+
+### Structure
+
+The configuration file is divided into two main sections:
+
+1. **Networks**: This section defines the networks that your application will use. There is an example network configuration (`op-network-1`) and a blank network configuration (`op-network-N`) for you to fill out.
+
+2. **Sequencers**: This section defines the sequencers for each network. Again, there is an example sequencer configuration for `op-network-1` and a blank sequencer configuration for `op-network-N`.
+
+Is is recommended to update the network name and sequencer names for your specifc configuration in the toml object declaration
+
+### Config Usage
+
+1. Copy this file to `config.toml` in your application's root directory.
+2. Modify the example configurations or fill out the blank configurations as needed for your application.
+3. Save the `config.toml` file and use it to configure your application's networks and sequencers.
+
+Remember, the example configurations are provided for your convenience, but you should review and update them to match your specific requirements.

op-conductor-ops/config.py

@@ -0,0 +1,32 @@
+from network import Network
+from sequencer import Sequencer
+import toml
+
+
+def read_config(config_path: str) -> tuple[dict[str, Sequencer], str]:
+    config = toml.load(config_path)
+
+    cert_path = config.get('cert_path', "")
+    # if cert path is relative, pre-pend the config path
+    if not cert_path.startswith('/'):
+        cert_path = f"{config_path.rsplit('/', 1)[0]}/{cert_path}"
+
+    # load sequencers into a map
+    sequencers = {}
+    for name, seq_config in config['sequencers'].items():
+        sequencers[name] = Sequencer(
+            sequencer_id=name,
+            raft_addr=seq_config['raft_addr'],
+            conductor_rpc_url=seq_config['conductor_rpc_url'],
+            node_rpc_url=seq_config['node_rpc_url'],
+            voting=seq_config['voting']
+        )
+
+    # Initialize network, with list of sequencers
+    networks = {}
+    for network_name, network_config in config['networks'].items():
+        network_sequencers = [sequencers[seq_name]
+                              for seq_name in network_config['sequencers']]
+        networks[network_name] = Network(network_name, network_sequencers)
+
+    return networks, cert_path

op-conductor-ops/example.config.toml

@@ -0,0 +1,62 @@
+# Path to the SSL/TLS certificate file
+cert_path = "./cacert.pem"
+
+# Network configurations
+[networks]
+
+# Example network configuration
+[networks.op-network-1]
+sequencers = [
+    "op-network-1-sequencer-0",
+    "op-network-1-sequencer-1",
+    "op-network-1-sequencer-2",
+]
+
+# Blank network configuration
+[networks.op-network-N]
+sequencers = [
+    "op-network-N-sequencer-0",
+    "op-network-N-sequencer-1",
+    "op-network-N-sequencer-2",
+]
+
+# Sequencer configurations
+[sequencers]
+
+# Example sequencer configuration for op-network-1 with three sequencers
+[sequencers.op-network-1-sequencer-0]
+raft_addr = "op-network-1-sequencer-0-op-conductor-raft:50050"
+conductor_rpc_url = "https://op-network-1-sequencer-0-op-conductor"
+node_rpc_url = "https://op-network-1-sequencer-0-op-node"
+voting = true
+
+[sequencers.op-network-1-sequencer-1]
+raft_addr = "op-network-1-sequencer-1-op-conductor-raft.50050"
+conductor_rpc_url = "https://op-network-1-sequencer-1-op-conductor"
+node_rpc_url = "https://op-network-1-sequencer-1-op-node"
+voting = false
+
+[sequencers.op-network-1-sequencer-2]
+raft_addr = "op-network-1-sequencer-2-op-conductor-raft:50050"
+conductor_rpc_url = "https://op-network-1-sequencer-2-op-conductor"
+node_rpc_url = "https://op-network-1-sequencer-2-op-node"
+voting = true
+
+# Blank sequencer configuration for op-network-N with three blank sequencers
+[sequencers.op-network-N-sequencer-0]
+raft_addr = ""
+conductor_rpc_url = ""
+node_rpc_url = ""
+voting = true
+
+[sequencers.op-network-N-sequencer-1]
+raft_addr = ""
+conductor_rpc_url = ""
+node_rpc_url = ""
+voting = true
+
+[sequencers.op-network-N-sequencer-2]
+raft_addr = ""
+conductor_rpc_url = ""
+node_rpc_url = ""
+voting = true

op-conductor-ops/network.py

@@ -0,0 +1,35 @@
+import concurrent.futures
+
+
+class Network:
+    def __init__(self, name, sequencers):
+        self.name = name
+        self.sequencers = sequencers
+
+    def update(self):
+        def _update(sequencer):
+            sequencer.update()
+        with concurrent.futures.ThreadPoolExecutor() as executor:
+            list(executor.map(_update, self.sequencers))
+
+    def get_sequencer_by_id(self, sequencer_id: str):
+        return next(
+            (
+                sequencer
+                for sequencer in self.sequencers
+                if sequencer.sequencer_id == sequencer_id
+            ),
+            None,
+        )
+
+    def find_conductor_leader(self):
+        return next(
+            (sequencer for sequencer in self.sequencers if sequencer.conductor_leader),
+            None,
+        )
+
+    def find_active_sequencer(self):
+        return next(
+            (sequencer for sequencer in self.sequencers if sequencer.sequencer_active),
+            None,
+        )

op-conductor-ops/op-conductor-ops

@@ -0,0 +1,7 @@
+#!/bin/sh
+set -e
+
+# cd to the directory of the script
+cd "$(dirname "$0")"
+poetry install --no-interaction --quiet
+poetry run python op-conductor-ops.py "${@}"

op-conductor-ops/op-conductor-ops.py

@@ -0,0 +1,372 @@
+#!/usr/bin/env python
+
+import os
+import time
+import requests
+from rich.console import Console
+from rich.table import Table
+import typer
+from typing_extensions import Annotated
+
+from config import read_config
+from utils import make_rpc_payload, print_boolean, print_warn, print_error
+
+
+app = typer.Typer(
+    help="CLI for managing OP Conductor sequencers. WARNING: This tool can cause a network outage if used improperly. Please consult #pod-devinfra before using."
+)
+
+console = Console()
+
+
+@app.callback()
+def load_config(
+    cert: Annotated[str, typer.Option(
+        "--cert",
+        help="[Optional] Certificate file path for https. Takes precedece over cert_path config",
+        envvar="CONDUCTOR_CERT",
+    )] = "",
+    config_path: Annotated[str, typer.Option(
+        "--config", "-c",
+        help="Path to config file.",
+        envvar="CONDUCTOR_CONFIG",
+    )] = "./config.toml",
+):
+    networks, config_cert_path = read_config(config_path)
+    global NETWORKS
+    NETWORKS = networks
+
+    # Use the cert path from the command line if provided,
+    # otherwise use the one from the config
+    # Export the certificate for https connections
+    cert_path = cert or config_cert_path
+    if cert_path:
+        os.environ["REQUESTS_CA_BUNDLE"] = cert_path
+        os.environ["SSL_CERT_FILE"] = cert_path
+
+
+def get_network(network: str):
+    if network not in NETWORKS:
+        typer.echo(f"Network must be one of {', '.join(NETWORKS.keys())}")
+        raise typer.Exit(code=1)
+    network_obj = NETWORKS[network]
+    network_obj.update()
+    return network_obj
+
+
+@app.command()
+def status(network: str):
+    """Print the status of all sequencers in a network."""
+    network_obj = get_network(network)
+    sequencers = network_obj.sequencers
+    table = Table(
+        "Sequencer ID",
+        "Conductor Active",
+        "Sequencer Healthy",
+        "Conductor Leader",
+        "Active Sequencer",
+        "Unsafe Number",
+        "Unsafe Hash",
+    )
+    for sequencer in sequencers:
+        table.add_row(
+            sequencer.sequencer_id,
+            print_boolean(sequencer.conductor_active),
+            print_boolean(sequencer.sequencer_healthy),
+            print_boolean(sequencer.conductor_leader),
+            print_boolean(sequencer.sequencer_active),
+            str(sequencer.unsafe_l2_number),
+            str(sequencer.unsafe_l2_hash),
+        )
+    console.print(table)
+
+    leader = network_obj.find_conductor_leader()
+    if leader is None:
+        print_warn(f"Could not find current leader in network {network}")
+    else:
+        display_correction = False
+        membership = {x["id"]: x for x in leader.cluster_membership()}
+        for sequencer in sequencers:
+            if sequencer.sequencer_id in membership:
+                if (
+                    int(not sequencer.voting)
+                    != membership[sequencer.sequencer_id]["suffrage"]
+                ):
+                    print_error(
+                        f": {sequencer.sequencer_id} does not have the correct voting status.")
+                    display_correction = True
+            else:
+                print_warn(
+                    f": {sequencer.sequencer_id} is not in the cluster")
+                display_correction = True
+        if display_correction:
+            print_warn(
+                "Run 'update-cluster-membership' to correct membership issues")
+
+
+@app.command()
+def transfer_leader(network: str, sequencer_id: str):
+    """Transfer leadership to a specific sequencer."""
+    network_obj = get_network(network)
+
+    sequencer = network_obj.get_sequencer_by_id(sequencer_id)
+    if sequencer is None:
+        print_error(
+            f"Sequencer ID {sequencer_id} not found in network {network}")
+        raise typer.Exit(code=1)
+    if sequencer.voting is False:
+        print_error(f"Sequencer {sequencer_id} is not a voter")
+        raise typer.Exit(code=1)
+
+    healthy = sequencer.sequencer_healthy
+    if not healthy:
+        print_error(f"Target sequencer {sequencer_id} is not healthy")
+        raise typer.Exit(code=1)
+
+    leader = network_obj.find_conductor_leader()
+    if leader is None:
+        print_error(f"Could not find current leader in network {network}")
+        raise typer.Exit(code=1)
+
+    resp = requests.post(
+        leader.conductor_rpc_url,
+        json=make_rpc_payload(
+            "conductor_transferLeaderToServer",
+            params=[sequencer.sequencer_id, sequencer.raft_addr],
+        ),
+    )
+    resp.raise_for_status()
+    if "error" in resp.json():
+        print_error(
+            f"Failed to transfer leader to {sequencer_id}: {resp.json()['error']}"
+        )
+        raise typer.Exit(code=1)
+
+    typer.echo(f"Successfully transferred leader to {sequencer_id}")
+
+
+@app.command()
+def pause(network: str, sequencer_id: str = None):
+    """Pause all conductors.
+    If --sequencer-id is provided, only pause conductor for that sequencer.
+    """
+    network_obj = get_network(network)
+    sequencers = network_obj.sequencers
+
+    if sequencer_id is not None:
+        sequencer = network_obj.get_sequencer_by_id(sequencer_id)
+        if sequencer is None:
+            print_error(
+                f"Sequencer ID {sequencer_id} not found in network {network}")
+            raise typer.Exit(code=1)
+        sequencers = [sequencer]
+
+    error = False
+    for sequencer in sequencers:
+        resp = requests.post(
+            sequencer.conductor_rpc_url,
+            json=make_rpc_payload("conductor_pause"),
+        )
+        try:
+            resp.raise_for_status()
+            if "error" in resp.json():
+                raise Exception(resp.json()["error"])
+            typer.echo(f"Successfully paused {sequencer.sequencer_id}")
+        except Exception as e:
+            typer.echo(f"Failed to pause {sequencer.sequencer_id}: {e}")
+    if error:
+        raise typer.Exit(code=1)
+
+
+@app.command()
+def resume(network: str, sequencer_id: str = None):
+    """Resume all conductors.
+    If --sequencer-id is provided, only resume conductor for that sequencer.
+    """
+    network_obj = get_network(network)
+    sequencers = network_obj.sequencers
+
+    if sequencer_id is not None:
+        sequencer = network_obj.get_sequencer_by_id(sequencer_id)
+        if sequencer is None:
+            print_error(
+                f"sequencer ID {sequencer_id} not found in network {network}")
+            raise typer.Exit(code=1)
+        sequencers = [sequencer]
+
+    error = False
+    for sequencer in sequencers:
+        resp = requests.post(
+            sequencer.conductor_rpc_url,
+            json=make_rpc_payload("conductor_resume"),
+        )
+        try:
+            resp.raise_for_status()
+            if "error" in resp.json():
+                raise Exception(resp.json()["error"])
+            typer.echo(f"Successfully resumed {sequencer.sequencer_id}")
+        except Exception as e:
+            print_error(f"Failed to resume {sequencer.sequencer_id}: {e}")
+    if error:
+        raise typer.Exit(code=1)
+
+
+@app.command()
+def override_leader(network: str, sequencer_id: str):
+    """Override the conductor_leader response for a sequencer to True.
+    Note that this does not affect consensus and it should only be used for disaster recovery purposes.
+    """
+    network_obj = get_network(network)
+    sequencer = network_obj.get_sequencer_by_id(sequencer_id)
+    if sequencer is None:
+        print_error(
+            f"sequencer ID {sequencer_id} not found in network {network}")
+        raise typer.Exit(code=1)
+
+    resp = requests.post(
+        sequencer.conductor_rpc_url,
+        json=make_rpc_payload("conductor_overrideLeader"),
+    )
+    resp.raise_for_status()
+    if "error" in resp.json():
+        print_error(
+            f"Failed to override conductor leader status for {sequencer_id}: {resp.json()['error']}"
+        )
+        raise typer.Exit(code=1)
+
+    resp = requests.post(
+        sequencer.node_rpc_url,
+        json=make_rpc_payload("admin_overrideLeader"),
+    )
+    resp.raise_for_status()
+    if "error" in resp.json():
+        print_error(
+            f"Failed to override sequencer leader status for {sequencer_id}: {resp.json()['error']}"
+        )
+        raise typer.Exit(code=1)
+
+    typer.echo(f"Successfully overrode leader for {sequencer_id}")
+
+
+@app.command()
+def remove_server(network: str, sequencer_id: str):
+    """Remove a sequencer from the cluster."""
+    network_obj = get_network(network)
+    sequencer = network_obj.get_sequencer_by_id(sequencer_id)
+    if sequencer is None:
+        print_error(
+            f"sequencer ID {sequencer_id} not found in network {network}")
+        raise typer.Exit(code=1)
+
+    leader = network_obj.find_conductor_leader()
+
+    resp = requests.post(
+        leader.conductor_rpc_url,
+        json=make_rpc_payload("conductor_removeServer",
+                              params=[sequencer_id, 0]),
+    )
+    resp.raise_for_status()
+    if "error" in resp.json():
+        print_error(f"Failed to remove {sequencer_id}: {resp.json()['error']}")
+        raise typer.Exit(code=1)
+
+    typer.echo(f"Successfully removed {sequencer_id}")
+
+
+@app.command()
+def update_cluster_membership(network: str):
+    """Update the cluster membership to match the sequencer configuration."""
+    network_obj = get_network(network)
+
+    sequencers = network_obj.sequencers
+
+    leader = network_obj.find_conductor_leader()
+    if leader is None:
+        print_error(f"Could not find current leader in network {network}")
+        raise typer.Exit(code=1)
+
+    membership = {x["id"]: x for x in leader.cluster_membership()}
+
+    error = False
+    for sequencer in sequencers:
+        if sequencer.sequencer_id in membership:
+            if (
+                int(not sequencer.voting)
+                != membership[sequencer.sequencer_id]["suffrage"]
+            ):
+                typer.echo(
+                    f"Removing {sequencer.sequencer_id} from cluster to update voting status"
+                )
+                remove_server(network, sequencer.sequencer_id)
+        method = (
+            "conductor_addServerAsVoter"
+            if sequencer.voting
+            else "conductor_addServerAsNonvoter"
+        )
+        resp = requests.post(
+            leader.conductor_rpc_url,
+            json=make_rpc_payload(
+                method,
+                params=[sequencer.sequencer_id, sequencer.raft_addr, 0],
+            ),
+        )
+        try:
+            resp.raise_for_status()
+            if "error" in resp.json():
+                raise Exception(resp.json()["error"])
+            typer.echo(
+                f"Successfully added {sequencer.sequencer_id} as {'voter' if sequencer.voting else 'non-voter'}"
+            )
+        except Exception as e:
+            print_warn(f"Failed to add {sequencer.sequencer_id} as voter: {e}")
+    if error:
+        raise typer.Exit(code=1)
+
+
+@app.command()
+def force_active_sequencer(network: str, sequencer_id: str):
+    """Forces a sequencer to become active using stop/start."""
+    network_obj = get_network(network)
+    sequencer = network_obj.get_sequencer_by_id(sequencer_id)
+    if sequencer is None:
+        typer.echo(f"sequencer ID {sequencer_id} not found in network {network}")
+        raise typer.Exit(code=1)
+
+    hash = sequencer.unsafe_l2_hash
+
+    active_sequencer = network_obj.find_active_sequencer()
+    if active_sequencer:
+      typer.echo(f"Stopping {active_sequencer.sequencer_id}")
+      resp = requests.post(
+          active_sequencer.node_rpc_url,
+          json=make_rpc_payload("admin_stopSequencer", params=[]),
+      )
+      resp.raise_for_status()
+      if "error" in resp.json():
+          typer.echo(f"Failed to stop {active_sequencer.sequencer_id}: {resp.json()['error']}")
+          raise typer.Exit(code=1)
+      hash = resp.json()["result"]
+
+    if not hash:
+        typer.echo(f"Failed to get a hash to start sequencer")
+        raise typer.Exit(code=1)
+
+    # sleep for a bit to allow sequencer to catch up
+    time.sleep(1)
+
+    # start sequencer
+    typer.echo(f"Starting {sequencer_id} with hash {hash}")
+    resp = requests.post(
+        sequencer.node_rpc_url,
+        json=make_rpc_payload("admin_startSequencer", params=[hash]),
+    )
+    resp.raise_for_status()
+    if "error" in resp.json():
+        typer.echo(f"Failed to start {sequencer_id}: {resp.json()['error']}")
+        raise typer.Exit(code=1)
+
+    typer.echo(f"Successfully forced {sequencer_id} to become active")
+
+
+if __name__ == "__main__":
+    app()

op-conductor-ops/poetry.lock

@@ -0,0 +1,307 @@
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+
+[[package]]
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+version = "2024.7.4"
+description = "Python package for providing Mozilla's CA Bundle."
+optional = false
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+]
+
+[[package]]
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+
+[[package]]
+name = "click"
+version = "8.1.7"
+description = "Composable command line interface toolkit"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "click-8.1.7-py3-none-any.whl", hash = "sha256:ae74fb96c20a0277a1d615f1e4d73c8414f5a98db8b799a7931d1582f3390c28"},
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+]
+
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+description = "Cross-platform colored terminal text."
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+files = [
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+]
+
+[[package]]
+name = "idna"
+version = "3.7"
+description = "Internationalized Domain Names in Applications (IDNA)"
+optional = false
+python-versions = ">=3.5"
+files = [
+    {file = "idna-3.7-py3-none-any.whl", hash = "sha256:82fee1fc78add43492d3a1898bfa6d8a904cc97d8427f683ed8e798d07761aa0"},
+    {file = "idna-3.7.tar.gz", hash = "sha256:028ff3aadf0609c1fd278d8ea3089299412a7a8b9bd005dd08b9f8285bcb5cfc"},
+]
+
+[[package]]
+name = "markdown-it-py"
+version = "3.0.0"
+description = "Python port of markdown-it. Markdown parsing, done right!"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "markdown-it-py-3.0.0.tar.gz", hash = "sha256:e3f60a94fa066dc52ec76661e37c851cb232d92f9886b15cb560aaada2df8feb"},
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+[package.dependencies]
+mdurl = ">=0.1,<1.0"
+
+[package.extras]
+benchmarking = ["psutil", "pytest", "pytest-benchmark"]
+code-style = ["pre-commit (>=3.0,<4.0)"]
+compare = ["commonmark (>=0.9,<1.0)", "markdown (>=3.4,<4.0)", "mistletoe (>=1.0,<2.0)", "mistune (>=2.0,<3.0)", "panflute (>=2.3,<3.0)"]
+linkify = ["linkify-it-py (>=1,<3)"]
+plugins = ["mdit-py-plugins"]
+profiling = ["gprof2dot"]
+rtd = ["jupyter_sphinx", "mdit-py-plugins", "myst-parser", "pyyaml", "sphinx", "sphinx-copybutton", "sphinx-design", "sphinx_book_theme"]
+testing = ["coverage", "pytest", "pytest-cov", "pytest-regressions"]
+
+[[package]]
+name = "mdurl"
+version = "0.1.2"
+description = "Markdown URL utilities"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "mdurl-0.1.2-py3-none-any.whl", hash = "sha256:84008a41e51615a49fc9966191ff91509e3c40b939176e643fd50a5c2196b8f8"},
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+]
+
+[[package]]
+name = "pygments"
+version = "2.18.0"
+description = "Pygments is a syntax highlighting package written in Python."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pygments-2.18.0-py3-none-any.whl", hash = "sha256:b8e6aca0523f3ab76fee51799c488e38782ac06eafcf95e7ba832985c8e7b13a"},
+    {file = "pygments-2.18.0.tar.gz", hash = "sha256:786ff802f32e91311bff3889f6e9a86e81505fe99f2735bb6d60ae0c5004f199"},
+]
+
+[package.extras]
+windows-terminal = ["colorama (>=0.4.6)"]
+
+[[package]]
+name = "requests"
+version = "2.32.3"
+description = "Python HTTP for Humans."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "requests-2.32.3-py3-none-any.whl", hash = "sha256:70761cfe03c773ceb22aa2f671b4757976145175cdfca038c02654d061d6dcc6"},
+    {file = "requests-2.32.3.tar.gz", hash = "sha256:55365417734eb18255590a9ff9eb97e9e1da868d4ccd6402399eaf68af20a760"},
+]
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+[package.dependencies]
+certifi = ">=2017.4.17"
+charset-normalizer = ">=2,<4"
+idna = ">=2.5,<4"
+urllib3 = ">=1.21.1,<3"
+
+[package.extras]
+socks = ["PySocks (>=1.5.6,!=1.5.7)"]
+use-chardet-on-py3 = ["chardet (>=3.0.2,<6)"]
+
+[[package]]
+name = "rich"
+version = "13.7.1"
+description = "Render rich text, tables, progress bars, syntax highlighting, markdown and more to the terminal"
+optional = false
+python-versions = ">=3.7.0"
+files = [
+    {file = "rich-13.7.1-py3-none-any.whl", hash = "sha256:4edbae314f59eb482f54e9e30bf00d33350aaa94f4bfcd4e9e3110e64d0d7222"},
+    {file = "rich-13.7.1.tar.gz", hash = "sha256:9be308cb1fe2f1f57d67ce99e95af38a1e2bc71ad9813b0e247cf7ffbcc3a432"},
+]
+
+[package.dependencies]
+markdown-it-py = ">=2.2.0"
+pygments = ">=2.13.0,<3.0.0"
+
+[package.extras]
+jupyter = ["ipywidgets (>=7.5.1,<9)"]
+
+[[package]]
+name = "shellingham"
+version = "1.5.4"
+description = "Tool to Detect Surrounding Shell"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "shellingham-1.5.4-py2.py3-none-any.whl", hash = "sha256:7ecfff8f2fd72616f7481040475a65b2bf8af90a56c89140852d1120324e8686"},
+    {file = "shellingham-1.5.4.tar.gz", hash = "sha256:8dbca0739d487e5bd35ab3ca4b36e11c4078f3a234bfce294b0a0291363404de"},
+]
+
+[[package]]
+name = "toml"
+version = "0.10.2"
+description = "Python Library for Tom's Obvious, Minimal Language"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+files = [
+    {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
+    {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
+]
+
+[[package]]
+name = "typer"
+version = "0.12.3"
+description = "Typer, build great CLIs. Easy to code. Based on Python type hints."
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "typer-0.12.3-py3-none-any.whl", hash = "sha256:070d7ca53f785acbccba8e7d28b08dcd88f79f1fbda035ade0aecec71ca5c914"},
+    {file = "typer-0.12.3.tar.gz", hash = "sha256:49e73131481d804288ef62598d97a1ceef3058905aa536a1134f90891ba35482"},
+]
+
+[package.dependencies]
+click = ">=8.0.0"
+rich = ">=10.11.0"
+shellingham = ">=1.3.0"
+typing-extensions = ">=3.7.4.3"
+
+[[package]]
+name = "typing-extensions"
+version = "4.12.2"
+description = "Backported and Experimental Type Hints for Python 3.8+"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "typing_extensions-4.12.2-py3-none-any.whl", hash = "sha256:04e5ca0351e0f3f85c6853954072df659d0d13fac324d0072316b67d7794700d"},
+    {file = "typing_extensions-4.12.2.tar.gz", hash = "sha256:1a7ead55c7e559dd4dee8856e3a88b41225abfe1ce8df57b7c13915fe121ffb8"},
+]
+
+[[package]]
+name = "urllib3"
+version = "2.2.2"
+description = "HTTP library with thread-safe connection pooling, file post, and more."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "urllib3-2.2.2-py3-none-any.whl", hash = "sha256:a448b2f64d686155468037e1ace9f2d2199776e17f0a46610480d311f73e3472"},
+    {file = "urllib3-2.2.2.tar.gz", hash = "sha256:dd505485549a7a552833da5e6063639d0d177c04f23bc3864e41e5dc5f612168"},
+]
+
+[package.extras]
+brotli = ["brotli (>=1.0.9)", "brotlicffi (>=0.8.0)"]
+h2 = ["h2 (>=4,<5)"]
+socks = ["pysocks (>=1.5.6,!=1.5.7,<2.0)"]
+zstd = ["zstandard (>=0.18.0)"]
+
+[metadata]
+lock-version = "2.0"
+python-versions = "^3.12"
+content-hash = "b56021bf3dca52508e895f8746030fedc8d5d4a7b5e91cd9e25874ed1970f580"

op-conductor-ops/pyproject.toml

@@ -0,0 +1,17 @@
+[tool.poetry]
+name = "op-conductor-ops"
+description = "CLI tool for managing op-conductor sequencer clusters"
+authors = ["Zach Howard <zach@oplabs.co>"]
+license = "MIT"
+readme = "README.md"
+package-mode = false
+
+[tool.poetry.dependencies]
+python = "^3.12"
+typer = "^0.12.3"
+requests = "^2.31.0"
+toml = "^0.10.2"
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"

op-conductor-ops/sequencer.py

@@ -0,0 +1,105 @@
+import concurrent.futures
+
+import requests
+import typer
+
+from utils import make_rpc_payload
+
+
+class Sequencer:
+    def __init__(
+        self, sequencer_id, raft_addr, conductor_rpc_url, node_rpc_url, voting
+    ):
+        self.sequencer_id = sequencer_id
+        self.raft_addr = raft_addr
+        self.conductor_rpc_url = conductor_rpc_url
+        self.node_rpc_url = node_rpc_url
+        self.voting = voting
+        self.conductor_active = None
+        self.conductor_leader = None
+        self.sequencer_healthy = None
+        self.sequencer_active = None
+        self.unsafe_l2_hash = None
+        self.unsafe_l2_number = None
+
+    def _get_sequencer_active(self):
+        resp = requests.post(
+            self.node_rpc_url,
+            json=make_rpc_payload("admin_sequencerActive"),
+        )
+        try:
+            resp.raise_for_status()
+        except Exception as e:
+            return None
+        self.sequencer_active = resp.json()["result"]
+
+    def _get_sequencer_healthy(self):
+        resp = requests.post(
+            self.conductor_rpc_url,
+            json=make_rpc_payload("conductor_sequencerHealthy"),
+        )
+        try:
+            resp.raise_for_status()
+        except Exception as e:
+            return None
+        self.sequencer_healthy = resp.json()["result"]
+
+    def _get_conductor_active(self):
+        resp = requests.post(
+            self.conductor_rpc_url,
+            json=make_rpc_payload("conductor_active"),
+        )
+        try:
+            resp.raise_for_status()
+        except Exception as e:
+            return None
+        self.conductor_active = resp.json()["result"]
+
+    def _get_conductor_leader(self):
+        resp = requests.post(
+            self.conductor_rpc_url,
+            json=make_rpc_payload("conductor_leader"),
+        )
+        try:
+            resp.raise_for_status()
+        except Exception as e:
+            return None
+        self.conductor_leader = resp.json()["result"]
+
+    def _get_unsafe_l2(self):
+        resp = requests.post(
+            self.node_rpc_url,
+            json=make_rpc_payload("optimism_syncStatus"),
+        )
+        try:
+            resp.raise_for_status()
+        except Exception as e:
+            return None
+        result = resp.json()["result"]
+        self.unsafe_l2_number = result["unsafe_l2"]["number"]
+        self.unsafe_l2_hash = result["unsafe_l2"]["hash"]
+
+    def cluster_membership(self):
+        resp = requests.post(
+            self.conductor_rpc_url,
+            json=make_rpc_payload("conductor_clusterMembership"),
+        )
+        resp.raise_for_status()
+        return resp.json()["result"]["servers"]
+
+    def update(self):
+        functions = [
+            self._get_conductor_active,
+            self._get_conductor_leader,
+            self._get_sequencer_healthy,
+            self._get_sequencer_active,
+            self._get_unsafe_l2,
+        ]
+        with concurrent.futures.ThreadPoolExecutor() as executor:
+            futures = {executor.submit(func): func for func in functions}
+            for future in concurrent.futures.as_completed(futures):
+                func = futures[future]
+                try:
+                    result = future.result()
+                except Exception as e:
+                    typer.echo(f"{func.__name__} raised an exception: {e}")

op-conductor-ops/utils.py

@@ -0,0 +1,26 @@
+from rich import print
+
+
+def print_boolean(value):
+    if value is None:
+        return "❓"
+    return "✅" if value else "❌"
+
+
+def make_rpc_payload(method: str, params: list = None):
+    if params is None:
+        params = []
+    return {
+        "id": 1,
+        "jsonrpc": "2.0",
+        "method": method,
+        "params": params,
+    }
+
+
+def print_error(msg: str):
+    print(f"[bold red]ERROR![/bold red] {msg}")
+
+
+def print_warn(msg: str):
+    print(f"[bold yellow]WARNING![/bold yellow] {msg}")

op-signer/.air.toml

@@ -0,0 +1,37 @@
+root = "."
+testdata_dir = "testdata"
+tmp_dir = "bin"
+
+[build]
+  args_bin = []
+  bin = "./bin/op-signer"
+  cmd = "make build"
+  delay = 1000
+  exclude_dir = ["bin"]
+  exclude_file = []
+  exclude_regex = ["_test.go"]
+  exclude_unchanged = false
+  follow_symlink = false
+  full_bin = ""
+  include_dir = []
+  include_ext = ["go", "tpl", "tmpl", "html"]
+  kill_delay = "0s"
+  log = "build-errors.log"
+  send_interrupt = false
+  stop_on_error = true
+
+[color]
+  app = ""
+  build = "yellow"
+  main = "magenta"
+  runner = "green"
+  watcher = "cyan"
+
+[log]
+  time = false
+
+[misc]
+  clean_on_exit = false
+
+[screen]
+  clear_on_rebuild = false

op-signer/.envrc

@@ -0,0 +1,4 @@
+export OP_SIGNER_LOG_LEVEL=debug
+export OP_SIGNER_LOG_COLOR=true
+export OP_SIGNER_RPC_PORT=8080
+export OP_SIGNER_METRICS_ENABLED=true

op-signer/.gitignore

@@ -0,0 +1,2 @@
+bin/
+tls/

op-signer/CHANGELOG.md

@@ -0,0 +1 @@
+# @eth-optimism/signer

op-signer/Dockerfile

@@ -0,0 +1,18 @@
+FROM golang:1.21.3-alpine3.18 as builder
+
+COPY ./op-signer /app
+
+WORKDIR /app
+RUN apk --no-cache add make jq bash git alpine-sdk
+RUN make build
+
+FROM alpine:3.18
+RUN apk --no-cache add ca-certificates
+
+RUN addgroup -S app && adduser -S app -G app
+USER app
+WORKDIR /app
+
+COPY --from=builder /app/bin/op-signer /app
+
+ENTRYPOINT ["/app/op-signer"]

op-signer/Makefile

@@ -0,0 +1,37 @@
+GITCOMMIT := $(shell git rev-parse HEAD)
+GITDATE := $(shell git show -s --format='%ct')
+VERSION := v0.0.0
+
+LDFLAGSSTRING +=-X main.GitCommit=$(GITCOMMIT)
+LDFLAGSSTRING +=-X main.GitDate=$(GITDATE)
+LDFLAGSSTRING +=-X main.Version=$(VERSION)
+LDFLAGS := -ldflags "$(LDFLAGSSTRING)"
+
+all: build
+
+docker:
+	docker build ../ -f Dockerfile -t op-signer:latest
+
+build:
+	env GO111MODULE=on go build -v $(LDFLAGS) -o ./bin/op-signer ./cmd
+
+clean:
+	rm ./bin/op-signer
+
+generate:
+	[ '$(shell mockgen --version)' = 'v1.6.0' ] || go install github.com/golang/mock/mockgen@v1.6.0
+	go generate ./...
+
+test: generate
+	go test -v ./...
+
+lint:
+	golangci-lint run ./...
+
+.PHONY: \
+	build \
+	clean \
+	test \
+	generate \
+	lint \
+	docker

op-signer/README.md

@@ -0,0 +1,14 @@
+# @eth-optimism/signer
+
+Signer service and client library
+
+## Setup
+
+Install go1.18
+
+```bash
+make build
+
+source .env.example # (or copy to .envrc if using direnv)
+./bin/signer
+```

op-signer/app.go

@@ -0,0 +1,239 @@
+package app
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"fmt"
+	"os"
+	"sync/atomic"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/urfave/cli/v2"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/log"
+
+	"github.com/ethereum-optimism/optimism/op-service/cliapp"
+	"github.com/ethereum-optimism/optimism/op-service/httputil"
+	oplog "github.com/ethereum-optimism/optimism/op-service/log"
+	opmetrics "github.com/ethereum-optimism/optimism/op-service/metrics"
+	"github.com/ethereum-optimism/optimism/op-service/oppprof"
+	oprpc "github.com/ethereum-optimism/optimism/op-service/rpc"
+	"github.com/ethereum-optimism/optimism/op-service/tls/certman"
+
+	"github.com/ethereum-optimism/infra/op-signer/client"
+	"github.com/ethereum-optimism/infra/op-signer/service"
+)
+
+type SignerApp struct {
+	log log.Logger
+
+	version string
+
+	pprofServer   *oppprof.Service
+	metricsServer *httputil.HTTPServer
+	registry      *prometheus.Registry
+
+	signer *service.SignerService
+
+	rpc *oprpc.Server
+
+	stopped atomic.Bool
+}
+
+func InitFromConfig(ctx context.Context, log log.Logger, cfg *Config, version string) (*SignerApp, error) {
+	if err := cfg.Check(); err != nil {
+		return nil, fmt.Errorf("invalid config: %w", err)
+	}
+	app := &SignerApp{log: log, version: version}
+	if err := app.init(cfg); err != nil {
+		return nil, errors.Join(err, app.Stop(ctx)) // clean up the failed init attempt
+	}
+	return app, nil
+}
+
+func (s *SignerApp) init(cfg *Config) error {
+	if err := s.initPprof(cfg); err != nil {
+		return fmt.Errorf("pprof error: %w", err)
+	}
+	if err := s.initMetrics(cfg); err != nil {
+		return fmt.Errorf("metrics error: %w", err)
+	}
+	if err := s.initRPC(cfg); err != nil {
+		return fmt.Errorf("metrics error: %w", err)
+	}
+	return nil
+}
+
+func (s *SignerApp) initPprof(cfg *Config) error {
+	if !cfg.PprofConfig.ListenEnabled {
+		return nil
+	}
+	s.pprofServer = oppprof.New(
+		cfg.PprofConfig.ListenEnabled,
+		cfg.PprofConfig.ListenAddr,
+		cfg.PprofConfig.ListenPort,
+		cfg.PprofConfig.ProfileType,
+		cfg.PprofConfig.ProfileDir,
+		cfg.PprofConfig.ProfileFilename,
+	)
+	s.log.Info("Starting pprof server", "addr", cfg.PprofConfig.ListenAddr, "port", cfg.PprofConfig.ListenPort)
+	if err := s.pprofServer.Start(); err != nil {
+		return fmt.Errorf("failed to start pprof server: %w", err)
+	}
+	return nil
+}
+
+func (s *SignerApp) initMetrics(cfg *Config) error {
+	registry := opmetrics.NewRegistry()
+	registry.MustRegister(service.MetricSignTransactionTotal)
+	s.registry = registry // some things require metrics registry
+
+	if !cfg.MetricsConfig.Enabled {
+		return nil
+	}
+
+	metricsCfg := cfg.MetricsConfig
+	s.log.Info("Starting metrics server", "addr", metricsCfg.ListenAddr, "port", metricsCfg.ListenPort)
+	metricsServer, err := opmetrics.StartServer(registry, metricsCfg.ListenAddr, metricsCfg.ListenPort)
+	if err != nil {
+		return fmt.Errorf("failed to start metrics server: %w", err)
+	}
+	s.log.Info("Started metrics server", "endpoint", metricsServer.Addr())
+	s.metricsServer = metricsServer
+	return nil
+}
+
+func (s *SignerApp) initRPC(cfg *Config) error {
+	caCert, err := os.ReadFile(cfg.TLSConfig.TLSCaCert)
+	if err != nil {
+		return fmt.Errorf("failed to read tls ca cert: %s", string(caCert))
+	}
+	caCertPool := x509.NewCertPool()
+	caCertPool.AppendCertsFromPEM(caCert)
+
+	cm, err := certman.New(s.log, cfg.TLSConfig.TLSCert, cfg.TLSConfig.TLSKey)
+	if err != nil {
+		return fmt.Errorf("failed to read tls cert or key: %w", err)
+	}
+	if err := cm.Watch(); err != nil {
+		return fmt.Errorf("failed to start certman watcher: %w", err)
+	}
+
+	tlsConfig := &tls.Config{
+		GetCertificate: cm.GetCertificate,
+		ClientCAs:      caCertPool,
+		ClientAuth:     tls.VerifyClientCertIfGiven, // necessary for k8s healthz probes, but we check the cert in service/auth.go
+	}
+	serverTlsConfig := &oprpc.ServerTLSConfig{
+		Config:    tlsConfig,
+		CLIConfig: &cfg.TLSConfig,
+	}
+
+	rpcCfg := cfg.RPCConfig
+	s.rpc = oprpc.NewServer(
+		rpcCfg.ListenAddr,
+		rpcCfg.ListenPort,
+		s.version,
+		oprpc.WithLogger(s.log),
+		oprpc.WithTLSConfig(serverTlsConfig),
+		oprpc.WithMiddleware(service.NewAuthMiddleware()),
+		oprpc.WithHTTPRecorder(opmetrics.NewPromHTTPRecorder(s.registry, "signer")),
+	)
+
+	serviceCfg, err := service.ReadConfig(cfg.ServiceConfigPath)
+	if err != nil {
+		return fmt.Errorf("failed to read service config: %w", err)
+	}
+	s.signer = service.NewSignerService(s.log, serviceCfg)
+	s.signer.RegisterAPIs(s.rpc)
+
+	if err := s.rpc.Start(); err != nil {
+		return fmt.Errorf("error starting RPC server: %w", err)
+	}
+	s.log.Info("Started op-signer RPC server", "addr", s.rpc.Endpoint())
+
+	return nil
+}
+
+func (s *SignerApp) Start(ctx context.Context) error {
+	return nil
+}
+
+func (s *SignerApp) Stop(ctx context.Context) error {
+	var result error
+	if s.rpc != nil {
+		if err := s.rpc.Stop(); err != nil {
+			result = errors.Join(result, fmt.Errorf("failed to stop RPC server: %w", err))
+		}
+	}
+	if s.pprofServer != nil {
+		if err := s.pprofServer.Stop(ctx); err != nil {
+			result = errors.Join(result, fmt.Errorf("failed to stop pprof server: %w", err))
+		}
+	}
+	if s.metricsServer != nil {
+		if err := s.metricsServer.Stop(ctx); err != nil {
+			result = errors.Join(result, fmt.Errorf("failed to stop metrics server: %w", err))
+		}
+	}
+	return result
+}
+
+func (s *SignerApp) Stopped() bool {
+	return s.stopped.Load()
+}
+
+var _ cliapp.Lifecycle = (*SignerApp)(nil)
+
+func MainAppAction(version string) cliapp.LifecycleAction {
+	return func(cliCtx *cli.Context, _ context.CancelCauseFunc) (cliapp.Lifecycle, error) {
+		cfg := NewConfig(cliCtx)
+		logger := oplog.NewLogger(cliCtx.App.Writer, cfg.LogConfig)
+		return InitFromConfig(cliCtx.Context, logger, cfg, version)
+	}
+}
+
+func ClientSign(version string) func(cliCtx *cli.Context) error {
+	return func(cliCtx *cli.Context) error {
+		cfg := NewConfig(cliCtx)
+		if err := cfg.Check(); err != nil {
+			return fmt.Errorf("invalid CLI flags: %w", err)
+		}
+
+		l := oplog.NewLogger(os.Stdout, cfg.LogConfig)
+		log.Root().SetHandler(l.GetHandler())
+
+		txarg := cliCtx.Args().First()
+		if txarg == "" {
+			return errors.New("no transaction argument was provided")
+		}
+		txraw, err := hexutil.Decode(txarg)
+		if err != nil {
+			return errors.New("failed to decode transaction argument")
+		}
+
+		client, err := client.NewSignerClient(l, cfg.ClientEndpoint, cfg.TLSConfig)
+		if err != nil {
+			return err
+		}
+
+		tx := &types.Transaction{}
+		if err := tx.UnmarshalBinary(txraw); err != nil {
+			return fmt.Errorf("failed to unmarshal transaction argument: %w", err)
+		}
+
+		tx, err = client.SignTransaction(context.Background(), tx)
+		if err != nil {
+			return err
+		}
+
+		result, _ := tx.MarshalJSON()
+		fmt.Println(string(result))
+
+		return nil
+	}
+}

op-signer/client/client.go

@@ -0,0 +1,91 @@
+package client
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"net/http"
+	"os"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/rpc"
+
+	"github.com/ethereum-optimism/optimism/op-service/signer"
+	optls "github.com/ethereum-optimism/optimism/op-service/tls"
+)
+
+type SignerClient struct {
+	client *rpc.Client
+	status string
+	logger log.Logger
+}
+
+func NewSignerClient(logger log.Logger, endpoint string, tlsConfig optls.CLIConfig) (*SignerClient, error) {
+
+	caCert, err := os.ReadFile(tlsConfig.TLSCaCert)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read tls.ca: %w", err)
+	}
+	caCertPool := x509.NewCertPool()
+	caCertPool.AppendCertsFromPEM(caCert)
+
+	cert, err := tls.LoadX509KeyPair(tlsConfig.TLSCert, tlsConfig.TLSKey)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read tls.cert or tls.key: %w", err)
+	}
+
+	httpClient := &http.Client{
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{
+				RootCAs:      caCertPool,
+				Certificates: []tls.Certificate{cert},
+			},
+		},
+	}
+
+	rpcClient, err := rpc.DialOptions(context.Background(), endpoint, rpc.WithHTTPClient(httpClient))
+	if err != nil {
+		return nil, err
+	}
+
+	signerClient := &SignerClient{logger: logger, client: rpcClient}
+	// Check if reachable
+	version, err := signerClient.pingVersion()
+	if err != nil {
+		return nil, err
+	}
+	signerClient.status = fmt.Sprintf("ok [version=%v]", version)
+	return signerClient, nil
+}
+
+func (s *SignerClient) pingVersion() (string, error) {
+	var v string
+	if err := s.client.Call(&v, "health_status"); err != nil {
+		return "", err
+	}
+	return v, nil
+}
+
+func (s *SignerClient) SignTransaction(
+	ctx context.Context,
+	tx *types.Transaction,
+) (*types.Transaction, error) {
+
+	args := signer.NewTransactionArgsFromTransaction(tx.ChainId(), nil, tx)
+
+	var result hexutil.Bytes
+
+	if err := s.client.Call(&result, "eth_signTransaction", args); err != nil {
+		return nil, fmt.Errorf("eth_signTransaction failed: %w", err)
+	}
+
+	signed := &types.Transaction{}
+	if err := signed.UnmarshalBinary(result); err != nil {
+		return nil, err
+	}
+
+	return signed, nil
+}

op-signer/cmd/main.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/urfave/cli/v2"
+
+	"github.com/ethereum/go-ethereum/log"
+
+	signer "github.com/ethereum-optimism/infra/op-signer"
+	"github.com/ethereum-optimism/optimism/op-service/cliapp"
+	oplog "github.com/ethereum-optimism/optimism/op-service/log"
+)
+
+var (
+	Version   = ""
+	GitCommit = ""
+	GitDate   = ""
+)
+
+func main() {
+	oplog.SetupDefaults()
+
+	app := cli.NewApp()
+	app.Flags = cliapp.ProtectFlags(signer.CLIFlags("OP_SIGNER"))
+	app.Version = fmt.Sprintf("%s-%s-%s", Version, GitCommit, GitDate)
+	app.Name = "op-signer"
+	app.Usage = "OP Signing Service"
+	app.Description = ""
+	app.Commands = []*cli.Command{
+		{
+			Name:  "client",
+			Usage: "test client for signer service",
+			Subcommands: []*cli.Command{
+				{
+					Name:   "sign",
+					Usage:  "sign a transaction",
+					Action: signer.ClientSign(Version),
+					Flags:  cliapp.ProtectFlags(signer.ClientSignCLIFlags("SIGNER")),
+				},
+			},
+		},
+	}
+
+	app.Action = cliapp.LifecycleCmd(signer.MainAppAction(Version))
+	err := app.Run(os.Args)
+	if err != nil {
+		log.Crit("Application failed", "message", err)
+	}
+}

op-signer/config.go

@@ -0,0 +1,85 @@
+package app
+
+import (
+	"github.com/urfave/cli/v2"
+
+	opservice "github.com/ethereum-optimism/optimism/op-service"
+	oplog "github.com/ethereum-optimism/optimism/op-service/log"
+	opmetrics "github.com/ethereum-optimism/optimism/op-service/metrics"
+	"github.com/ethereum-optimism/optimism/op-service/oppprof"
+	oprpc "github.com/ethereum-optimism/optimism/op-service/rpc"
+	optls "github.com/ethereum-optimism/optimism/op-service/tls"
+)
+
+const (
+	ServiceConfigPathFlagName = "config"
+	ClientEndpointFlagName    = "endpoint"
+)
+
+func CLIFlags(envPrefix string) []cli.Flag {
+	flags := []cli.Flag{
+		&cli.StringFlag{
+			Name:    ServiceConfigPathFlagName,
+			Usage:   "Signer service configuration file path",
+			Value:   "config.yaml",
+			EnvVars: opservice.PrefixEnvVar(envPrefix, "SERVICE_CONFIG"),
+		},
+	}
+	flags = append(flags, oprpc.CLIFlags(envPrefix)...)
+	flags = append(flags, oplog.CLIFlags(envPrefix)...)
+	flags = append(flags, opmetrics.CLIFlags(envPrefix)...)
+	flags = append(flags, oppprof.CLIFlags(envPrefix)...)
+	flags = append(flags, optls.CLIFlags(envPrefix)...)
+	return flags
+}
+
+func ClientSignCLIFlags(envPrefix string) []cli.Flag {
+	flags := []cli.Flag{
+		&cli.StringFlag{
+			Name:    ClientEndpointFlagName,
+			Usage:   "Signer endpoint the client will connect to",
+			Value:   "http://localhost:8080",
+			EnvVars: opservice.PrefixEnvVar(envPrefix, "CLIENT_ENDPOINT"),
+		},
+	}
+	return flags
+}
+
+type Config struct {
+	ClientEndpoint    string
+	ServiceConfigPath string
+
+	TLSConfig     optls.CLIConfig
+	RPCConfig     oprpc.CLIConfig
+	LogConfig     oplog.CLIConfig
+	MetricsConfig opmetrics.CLIConfig
+	PprofConfig   oppprof.CLIConfig
+}
+
+func (c Config) Check() error {
+	if err := c.RPCConfig.Check(); err != nil {
+		return err
+	}
+	if err := c.MetricsConfig.Check(); err != nil {
+		return err
+	}
+	if err := c.PprofConfig.Check(); err != nil {
+		return err
+	}
+	if err := c.TLSConfig.Check(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func NewConfig(ctx *cli.Context) *Config {
+	return &Config{
+		ClientEndpoint:    ctx.String(ClientEndpointFlagName),
+		ServiceConfigPath: ctx.String(ServiceConfigPathFlagName),
+		TLSConfig:         optls.ReadCLIConfig(ctx),
+		RPCConfig:         oprpc.ReadCLIConfig(ctx),
+		LogConfig:         oplog.ReadCLIConfig(ctx),
+		MetricsConfig:     opmetrics.ReadCLIConfig(ctx),
+		PprofConfig:       oppprof.ReadCLIConfig(ctx),
+	}
+}

op-signer/config.yaml

@@ -0,0 +1,3 @@
+auth:
+  - name: localhost
+    key: projects/my-gcp-project/locations/my-region/keyRings/my-ring/cryptoKeys/my-key/cryptoKeyVersions/1

op-signer/gen-local-tls.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+TLS_DIR=$SCRIPT_DIR/tls
+
+version=$(openssl version)
+
+if [[ "$version" != "LibreSSL"* ]] && [[ "$version" != "OpenSSL 1.1"* ]]; then
+  echo "openssl version: $version"
+  echo "script only works with LibreSSL (darwin) or OpenSSL 1.1*"
+  exit 1
+fi
+
+echo "Generating mTLS credentials for local development..."
+echo ""
+
+mkdir -p "$TLS_DIR"
+
+if [ ! -f "$TLS_DIR/ca.crt" ]; then
+  echo 'Generating CA'
+  openssl req -newkey rsa:2048 \
+    -new -nodes -x509 \
+    -days 365 \
+    -sha256 \
+    -out "$TLS_DIR/ca.crt" \
+    -keyout "$TLS_DIR/ca.key" \
+    -subj "/O=OP Labs/CN=root"
+fi
+
+echo 'Generating TLS certificate request'
+openssl genrsa -out "$TLS_DIR/tls.key" 2048
+openssl req -new -key "$TLS_DIR/tls.key" \
+  -days 1 \
+  -sha256 \
+  -out "$TLS_DIR/tls.csr" \
+  -keyout "$TLS_DIR/tls.key" \
+  -subj "/O=OP Labs/CN=localhost" \
+  -extensions san \
+  -config <(echo '[req]'; echo 'distinguished_name=req'; \
+            echo '[san]'; echo 'subjectAltName=DNS:localhost')
+
+openssl x509 -req -in "$TLS_DIR/tls.csr" \
+  -sha256 \
+  -CA "$TLS_DIR/ca.crt" \
+  -CAkey "$TLS_DIR/ca.key" \
+  -CAcreateserial \
+  -out "$TLS_DIR/tls.crt" \
+  -days 3 \
+  -extfile <(echo 'subjectAltName=DNS:localhost')

op-signer/go.mod

@@ -0,0 +1,115 @@
+module github.com/ethereum-optimism/infra/op-signer
+
+go 1.21
+
+require (
+	cloud.google.com/go/kms v1.10.1
+	github.com/ethereum-optimism/optimism v1.4.3-0.20240125020216-6a3b1ec12399
+	github.com/ethereum/go-ethereum v1.13.5
+	github.com/golang/mock v1.6.0
+	github.com/googleapis/gax-go v1.0.3
+	github.com/googleapis/gax-go/v2 v2.11.0
+	github.com/holiman/uint256 v1.2.3
+	github.com/prometheus/client_golang v1.18.0
+	github.com/stretchr/testify v1.8.4
+	github.com/urfave/cli/v2 v2.27.1
+	google.golang.org/protobuf v1.33.0
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	cloud.google.com/go/compute v1.20.1 // indirect
+	cloud.google.com/go/compute/metadata v0.2.3 // indirect
+	cloud.google.com/go/iam v0.13.0 // indirect
+	github.com/BurntSushi/toml v1.3.2 // indirect
+	github.com/DataDog/zstd v1.5.2 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/VictoriaMetrics/fastcache v1.12.1 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/bits-and-blooms/bitset v1.7.0 // indirect
+	github.com/btcsuite/btcd/btcec/v2 v2.2.0 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/cockroachdb/errors v1.11.1 // indirect
+	github.com/cockroachdb/logtags v0.0.0-20230118201751-21c54148d20b // indirect
+	github.com/cockroachdb/pebble v0.0.0-20231018212520-f6cde3fc2fa4 // indirect
+	github.com/cockroachdb/redact v1.1.5 // indirect
+	github.com/cockroachdb/tokenbucket v0.0.0-20230807174530-cc333fc44b06 // indirect
+	github.com/consensys/bavard v0.1.13 // indirect
+	github.com/consensys/gnark-crypto v0.12.1 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
+	github.com/crate-crypto/go-kzg-4844 v0.7.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/deckarep/golang-set/v2 v2.1.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 // indirect
+	github.com/ethereum-optimism/superchain-registry/superchain v0.0.0-20240123193359-a5fc767e225a // indirect
+	github.com/ethereum/c-kzg-4844 v0.4.0 // indirect
+	github.com/fjl/memsize v0.0.1 // indirect
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/getsentry/sentry-go v0.18.0 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
+	github.com/go-stack/stack v1.8.1 // indirect
+	github.com/gofrs/flock v0.8.1 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang-jwt/jwt/v4 v4.5.0 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/golang/snappy v0.0.5-0.20220116011046-fa5810519dcb // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/s2a-go v0.1.4 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.2.3 // indirect
+	github.com/gorilla/websocket v1.5.0 // indirect
+	github.com/hashicorp/go-bexpr v0.1.11 // indirect
+	github.com/huin/goupnp v1.3.0 // indirect
+	github.com/jackpal/go-nat-pmp v1.0.2 // indirect
+	github.com/klauspost/compress v1.17.2 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-runewidth v0.0.14 // indirect
+	github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/mitchellh/pointerstructure v1.2.1 // indirect
+	github.com/mmcloughlin/addchain v0.4.0 // indirect
+	github.com/olekukonko/tablewriter v0.0.5 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/client_model v0.5.0 // indirect
+	github.com/prometheus/common v0.45.0 // indirect
+	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/rivo/uniseg v0.4.3 // indirect
+	github.com/rogpeppe/go-internal v1.10.0 // indirect
+	github.com/rs/cors v1.9.0 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/shirou/gopsutil v3.21.11+incompatible // indirect
+	github.com/supranational/blst v0.3.11 // indirect
+	github.com/syndtr/goleveldb v1.0.1-0.20220614013038-64ee5596c38a // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
+	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
+	github.com/yusufpapurcu/wmi v1.2.2 // indirect
+	go.opencensus.io v0.24.0 // indirect
+	golang.org/x/crypto v0.18.0 // indirect
+	golang.org/x/exp v0.0.0-20231006140011-7918f672742d // indirect
+	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
+	golang.org/x/mod v0.14.0 // indirect
+	golang.org/x/net v0.19.0 // indirect
+	golang.org/x/oauth2 v0.12.0 // indirect
+	golang.org/x/sync v0.6.0 // indirect
+	golang.org/x/sys v0.16.0 // indirect
+	golang.org/x/term v0.16.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/tools v0.16.1 // indirect
+	google.golang.org/api v0.126.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/genproto v0.0.0-20230530153820-e85fd2cbaebc // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20230530153820-e85fd2cbaebc // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20230530153820-e85fd2cbaebc // indirect
+	google.golang.org/grpc v1.55.0 // indirect
+	gopkg.in/natefinch/lumberjack.v2 v2.0.0 // indirect
+	honnef.co/go/tools v0.0.1-2020.1.4 // indirect
+	rsc.io/tmplfunc v0.0.3 // indirect
+)
+
+replace github.com/ethereum/go-ethereum v1.13.5 => github.com/ethereum-optimism/op-geth v1.101305.3-rc.1.0.20240124221225-5c6f10d449ab

op-signer/go.sum

@@ -0,0 +1,496 @@
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op-signer/service/auth.go

@@ -0,0 +1,44 @@
+package service
+
+import (
+	"context"
+	"net/http"
+
+	oprpc "github.com/ethereum-optimism/optimism/op-service/rpc"
+	optls "github.com/ethereum-optimism/optimism/op-service/tls"
+)
+
+type ClientInfo struct {
+	ClientName string
+}
+
+type clientInfoContextKey struct{}
+
+func NewAuthMiddleware() oprpc.Middleware {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			clientInfo := ClientInfo{}
+
+			// PeerTLSInfo is attached to context by upstream op-service middleware
+			peerTlsInfo := optls.PeerTLSInfoFromContext(r.Context())
+			if peerTlsInfo.LeafCertificate == nil {
+				http.Error(w, "client certificate was not provided", 401)
+				return
+			}
+			// Note that the certificate is already verified by http server if we get here
+			if len(peerTlsInfo.LeafCertificate.DNSNames) < 1 {
+				http.Error(w, "client certificate verified but did not contain DNS SAN extension", 401)
+				return
+			}
+			clientInfo.ClientName = peerTlsInfo.LeafCertificate.DNSNames[0]
+
+			ctx := context.WithValue(r.Context(), clientInfoContextKey{}, clientInfo)
+			next.ServeHTTP(w, r.WithContext(ctx))
+		})
+	}
+}
+
+func ClientInfoFromContext(ctx context.Context) ClientInfo {
+	info, _ := ctx.Value(clientInfoContextKey{}).(ClientInfo)
+	return info
+}

op-signer/service/auth_test.go

@@ -0,0 +1,63 @@
+package service
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	optls "github.com/ethereum-optimism/optimism/op-service/tls"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAuthMiddleware_NoCertificate(t *testing.T) {
+	var handler http.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		assert.NotNil(t, nil, "handler should not have been invoked")
+	})
+	handler = NewAuthMiddleware()(handler)
+	handler = optls.NewPeerTLSMiddleware(handler)
+	assert.HTTPStatusCode(t, handler.ServeHTTP, "GET", "/", nil, 401)
+}
+
+func TestAuthMiddleware_CertificateMissingDNS(t *testing.T) {
+	req, _ := http.NewRequest("GET", "/", nil)
+	req.TLS = &tls.ConnectionState{PeerCertificates: []*x509.Certificate{}}
+
+	var handler http.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		assert.NotNil(t, nil, "handler should not have been invoked")
+	})
+
+	handler = NewAuthMiddleware()(handler)
+	handler = optls.NewPeerTLSMiddleware(handler)
+
+	rr := httptest.NewRecorder()
+	handler.ServeHTTP(rr, req)
+	result := rr.Result()
+	defer result.Body.Close()
+	assert.Equal(t, 401, result.StatusCode)
+}
+
+func TestAuthMiddleware_HappyPath(t *testing.T) {
+	req, _ := http.NewRequest("GET", "/", nil)
+	req.TLS = &tls.ConnectionState{
+		PeerCertificates: []*x509.Certificate{{DNSNames: []string{"client.oplabs.co"}}},
+	}
+
+	handlerInvoked := false
+	var handler http.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		clientInfo := ClientInfoFromContext(r.Context())
+		assert.Equal(t, "client.oplabs.co", clientInfo.ClientName)
+		handlerInvoked = true
+	})
+
+	handler = NewAuthMiddleware()(handler)
+	handler = optls.NewPeerTLSMiddleware(handler)
+
+	rr := httptest.NewRecorder()
+	handler.ServeHTTP(rr, req)
+	result := rr.Result()
+	defer result.Body.Close()
+	assert.Equal(t, 200, result.StatusCode)
+	assert.True(t, handlerInvoked)
+}

op-signer/service/config.go

@@ -0,0 +1,62 @@
+package service
+
+import (
+	"errors"
+	"fmt"
+	"math/big"
+	"os"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"gopkg.in/yaml.v3"
+)
+
+type AuthConfig struct {
+	ClientName  string   `yaml:"name"`
+	KeyName     string   `yaml:"key"`
+	ToAddresses []string `yaml:"toAddresses"`
+	MaxValue    string   `yaml:"maxValue"`
+}
+
+func (c AuthConfig) MaxValueToInt() *big.Int {
+	return hexutil.MustDecodeBig(c.MaxValue)
+}
+
+type SignerServiceConfig struct {
+	Auth []AuthConfig `yaml:"auth"`
+}
+
+func ReadConfig(path string) (SignerServiceConfig, error) {
+	config := SignerServiceConfig{}
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return config, err
+	}
+	if err := yaml.Unmarshal(data, &config); err != nil {
+		return config, err
+	}
+	for _, authConfig := range config.Auth {
+		for _, toAddress := range authConfig.ToAddresses {
+			if _, err := hexutil.Decode(toAddress); err != nil {
+				return config, fmt.Errorf("invalid toAddress '%s' in auth config: %w", toAddress, err)
+			}
+			if authConfig.MaxValue != "" {
+				if _, err := hexutil.DecodeBig(authConfig.MaxValue); err != nil {
+					return config, fmt.Errorf("invalid maxValue '%s' in auth config: %w", toAddress, err)
+				}
+			}
+		}
+	}
+	return config, err
+}
+
+func (s SignerServiceConfig) GetAuthConfigForClient(clientName string) (*AuthConfig, error) {
+	if clientName == "" {
+		return nil, errors.New("client name is empty")
+	}
+	for _, ac := range s.Auth {
+		if ac.ClientName == clientName {
+			return &ac, nil
+		}
+	}
+	return nil, fmt.Errorf("client '%s' is not authorized to use any keys", clientName)
+}

op-signer/service/errors.go

@@ -0,0 +1,11 @@
+package service
+
+type InvalidTransactionError struct{ message string }
+
+func (e *InvalidTransactionError) Error() string  { return e.message }
+func (e *InvalidTransactionError) ErrorCode() int { return -32010 }
+
+type UnauthorizedTransactionError struct{ message string }
+
+func (e *UnauthorizedTransactionError) Error() string  { return e.message }
+func (e *UnauthorizedTransactionError) ErrorCode() int { return -32011 }

op-signer/service/metrics.go

@@ -0,0 +1,12 @@
+package service
+
+import "github.com/prometheus/client_golang/prometheus"
+
+var (
+	MetricSignTransactionTotal = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "signer_signtransaction_total",
+			Help: ""},
+		[]string{"client", "status", "error"},
+	)
+)

op-signer/service/provider/cloudkms.go

@@ -0,0 +1,275 @@
+//go:generate mockgen -destination=mock_kms.go -package=provider github.com/ethereum-optimism/infra/op-signer/service/provider CloudKMSClient
+package provider
+
+import (
+	"bytes"
+	"context"
+	"crypto/x509/pkix"
+	"encoding/asn1"
+	"encoding/pem"
+	"errors"
+	"fmt"
+	"hash/crc32"
+	"math/big"
+
+	kms "cloud.google.com/go/kms/apiv1"
+	"cloud.google.com/go/kms/apiv1/kmspb"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/crypto/secp256k1"
+	"github.com/ethereum/go-ethereum/log"
+	gax "github.com/googleapis/gax-go"
+	"google.golang.org/protobuf/types/known/wrapperspb"
+)
+
+var (
+	oidPublicKeyECDSA      = asn1.ObjectIdentifier{1, 2, 840, 10045, 2, 1}
+	oidNamedCurveSECP256K1 = asn1.ObjectIdentifier{1, 3, 132, 0, 10}
+)
+
+type publicKeyInfo struct {
+	Raw       asn1.RawContent
+	Algorithm pkix.AlgorithmIdentifier
+	PublicKey asn1.BitString
+}
+
+type CloudKMSClient interface {
+	GetPublicKey(ctx context.Context, req *kmspb.GetPublicKeyRequest, opts ...gax.CallOption) (*kmspb.PublicKey, error)
+	AsymmetricSign(context context.Context, req *kmspb.AsymmetricSignRequest, opts ...gax.CallOption) (*kmspb.AsymmetricSignResponse, error)
+}
+
+type CloudKMSSignatureProvider struct {
+	logger log.Logger
+	client CloudKMSClient
+}
+
+func NewCloudKMSSignatureProvider(logger log.Logger) SignatureProvider {
+	ctx := context.Background()
+	client, err := kms.NewKeyManagementClient(ctx)
+	if err != nil {
+		logger.Error("failed to initialize kms client", "error", err)
+		panic(err)
+	}
+	return &CloudKMSSignatureProvider{logger, client}
+}
+
+func NewCloudKMSSignatureProviderWithClient(logger log.Logger, client CloudKMSClient) SignatureProvider {
+	return &CloudKMSSignatureProvider{logger, client}
+}
+
+func crc32c(data []byte) uint32 {
+	t := crc32.MakeTable(crc32.Castagnoli)
+	return crc32.Checksum(data, t)
+}
+
+func createSignRequestFromDigest(keyName string, digest []byte) *kmspb.AsymmetricSignRequest {
+	digestCRC32C := crc32c(digest)
+	return &kmspb.AsymmetricSignRequest{
+		Name: keyName,
+		Digest: &kmspb.Digest{
+			Digest: &kmspb.Digest_Sha256{
+				Sha256: digest,
+			},
+		},
+		DigestCrc32C: wrapperspb.Int64(int64(digestCRC32C)),
+	}
+}
+
+// SignDigest signs the digest with a given Cloud KMS keyname and returns a compact recoverable signature.
+// If the keyName provided is not a EC_SIGN_SECP256K1_SHA256 key, the result will be an error.
+func (c *CloudKMSSignatureProvider) SignDigest(
+	ctx context.Context,
+	keyName string,
+	digest []byte,
+) ([]byte, error) {
+	publicKey, err := c.GetPublicKey(ctx, keyName)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get public key: %w", err)
+	}
+
+	request := createSignRequestFromDigest(keyName, digest)
+	result, err := c.client.AsymmetricSign(ctx, request)
+	if err != nil {
+		return nil, fmt.Errorf("cloud kms sign request failed: %w", err)
+	}
+	if result.Name != request.Name {
+		return nil, errors.New("cloud kms sign request corrupted in transit")
+	}
+	if !result.VerifiedDigestCrc32C {
+		return nil, errors.New("cloud kms sign request corrupted in transit")
+	}
+	if int64(crc32c(result.Signature)) != result.SignatureCrc32C.Value {
+		return nil, errors.New("cloud kms sign response corrupted in transit")
+	}
+
+	c.logger.Debug(fmt.Sprintf("der signature: %s", hexutil.Encode(result.Signature)))
+
+	return convertToCompactRecoverableSignature(result.Signature, digest, publicKey)
+}
+
+func convertToCompactRecoverableSignature(derSignature, digest, publicKey []byte) ([]byte, error) {
+	signature, err := convertToCompactSignature(derSignature)
+	if err != nil {
+		// should never happen
+		return nil, fmt.Errorf("failed to convert to compact signature: %w", err)
+	}
+
+	// NOTE: so far I haven't seen CloudKMS produce a malleable signature
+	// but if it does happen, this can be handled as a retryable error by the client
+	if err := compactSignatureMalleabilityCheck(signature); err != nil {
+		// should never happen
+		return nil, fmt.Errorf("signature failed malleability check: %w", err)
+	}
+
+	if !secp256k1.VerifySignature(publicKey, digest, signature) {
+		// should never happen
+		return nil, errors.New("signature could not be verified with public key")
+	}
+
+	recId, err := calculateRecoveryID(signature, digest, publicKey)
+	if err != nil {
+		// should never happen
+		return nil, fmt.Errorf("failed to calculate recovery id: %w", err)
+	}
+
+	signature = append(signature, byte(recId))
+
+	return signature, nil
+}
+
+// convertToCompactSignature compacts a DER signature output from kms (>70 bytes) into 64 bytes
+func convertToCompactSignature(derSignature []byte) ([]byte, error) {
+	var parsedSig struct{ R, S *big.Int }
+	if _, err := asn1.Unmarshal(derSignature, &parsedSig); err != nil {
+		return nil, fmt.Errorf("asn1.Unmarshal error: %w", err)
+	}
+
+	curveOrderLen := 32
+	signature := make([]byte, 2*curveOrderLen)
+
+	// if S is non-canonical, lower it
+	curveOrder := secp256k1.S256().Params().Params().N
+	if parsedSig.S.Cmp(new(big.Int).Div(curveOrder, big.NewInt(2))) > 0 {
+		parsedSig.S = new(big.Int).Sub(curveOrder, parsedSig.S)
+	}
+
+	// left pad R and S with zeroes
+	rBytes := parsedSig.R.Bytes()
+	sBytes := parsedSig.S.Bytes()
+	copy(signature[curveOrderLen-len(rBytes):], rBytes)
+	copy(signature[len(signature)-len(sBytes):], sBytes)
+
+	return signature, nil
+}
+
+// calculateRecoveryID calculates the signature recovery id (65th byte, [0-3])
+func calculateRecoveryID(signature, digest, pubKey []byte) (int, error) {
+	recId := -1
+	var errorRes error
+
+	for i := 0; i < 4; i++ {
+		recSig := append(signature, byte(i))
+		publicKey, err := secp256k1.RecoverPubkey(digest, recSig)
+		if err != nil {
+			errorRes = err
+			continue
+		}
+		if bytes.Equal(publicKey, pubKey) {
+			recId = i
+			break
+		}
+	}
+
+	if recId == -1 {
+		return recId, fmt.Errorf("failed to calculate recovery id, should never happen: %w", errorRes)
+	}
+	return recId, nil
+}
+
+// compactSignatureMalleabilityCheck checks if signature can be used to produce a new valid signature
+// pulled from go-ethereum/crypto/secp256k1/secp256_test.go
+// see: http://coders-errand.com/malleability-ecdsa-signatures/
+func compactSignatureMalleabilityCheck(sig []byte) error {
+	b := int(sig[32])
+	if b < 0 {
+		return fmt.Errorf("highest bit is negative: %d", b)
+	}
+	if ((b >> 7) == 1) != ((b & 0x80) == 0x80) {
+		return fmt.Errorf("highest bit: %d bit >> 7: %d", b, b>>7)
+	}
+	if (b & 0x80) == 0x80 {
+		return fmt.Errorf("highest bit: %d bit & 0x80: %d", b, b&0x80)
+	}
+	return nil
+}
+
+// GetPublicKey returns a decoded secp256k1 public key.
+func (c *CloudKMSSignatureProvider) GetPublicKey(
+	ctx context.Context,
+	keyName string,
+) ([]byte, error) {
+	request := kmspb.GetPublicKeyRequest{
+		Name: keyName,
+	}
+
+	result, err := c.client.GetPublicKey(ctx, &request)
+	if err != nil {
+		return nil, fmt.Errorf("kms get public key request failed: %w", err)
+	}
+
+	key := []byte(result.Pem)
+	if int64(crc32c(key)) != result.PemCrc32C.Value {
+		return nil, errors.New("cloud kms public key response corrupted in transit")
+	}
+
+	return decodePublicKeyPEM(key)
+}
+
+// decodePublicKeyPEM decodes a PEM ECDSA public key with secp256k1 curve
+func decodePublicKeyPEM(key []byte) ([]byte, error) {
+	block, rest := pem.Decode([]byte(key))
+	if len(rest) > 0 {
+		return nil, fmt.Errorf("crypto: failed to parse PEM string, not all bytes in PEM key were decoded: %x", rest)
+	}
+
+	pkBytes, err := x509ParseECDSAPublicKey(block.Bytes)
+	if err != nil {
+		return nil, fmt.Errorf("crypto: failed to parse PEM string: %w", err)
+	}
+
+	return pkBytes, err
+}
+
+// x509ParseECDSAPublicKey parses a DER-encoded public key and ensures secp256k1 curve
+func x509ParseECDSAPublicKey(derBytes []byte) ([]byte, error) {
+	var pki publicKeyInfo
+	if rest, err := asn1.Unmarshal(derBytes, &pki); err != nil {
+		return nil, err
+	} else if len(rest) != 0 {
+		return nil, errors.New("x509: trailing data after ASN.1 of public-key")
+	}
+
+	if !pki.Algorithm.Algorithm.Equal(oidPublicKeyECDSA) {
+		return nil, errors.New("x509: unknown public key algorithm")
+	}
+
+	asn1Data := pki.PublicKey.RightAlign()
+	paramsData := pki.Algorithm.Parameters.FullBytes
+	namedCurveOID := new(asn1.ObjectIdentifier)
+	rest, err := asn1.Unmarshal(paramsData, namedCurveOID)
+	if err != nil {
+		return nil, fmt.Errorf("x509: failed to parse ECDSA parameters as named curve: %w", err)
+	}
+	if len(rest) != 0 {
+		return nil, errors.New("x509: trailing data after ECDSA parameters")
+	}
+
+	if !namedCurveOID.Equal(oidNamedCurveSECP256K1) {
+		return nil, errors.New("x509: unsupported elliptic curve")
+	}
+
+	if asn1Data[0] != 4 { // uncompressed form
+		return nil, errors.New("x509: only uncompressed keys are supported")
+	}
+
+	return asn1Data, nil
+}

op-signer/service/provider/cloudkms_test.go

@@ -0,0 +1,194 @@
+package provider
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"crypto/rand"
+	"io"
+	"testing"
+
+	gomock "github.com/golang/mock/gomock"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"cloud.google.com/go/kms/apiv1/kmspb"
+	"google.golang.org/protobuf/types/known/wrapperspb"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/crypto/secp256k1"
+	"github.com/ethereum/go-ethereum/log"
+)
+
+const (
+	CloudKMSPemPublicKey = `-----BEGIN PUBLIC KEY-----
+MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAEQpdToIk9lwjBdl0VcqXl7AwqhB9NwRf+
+IHRNqIUNa8vAH/5l5MGXO/qVT5D/4sOTfpd29BQAkDVOgTAneA2Vrg==
+-----END PUBLIC KEY-----`
+)
+
+func generateKey() *ecdsa.PrivateKey {
+	key, err := ecdsa.GenerateKey(secp256k1.S256(), rand.Reader)
+	if err != nil {
+		panic(err)
+	}
+	return key
+}
+
+// pulled from go-ethereum/crypto/secp256k1/secp256_test.go
+func csprngEntropy(n int) []byte {
+	buf := make([]byte, n)
+	if _, err := io.ReadFull(rand.Reader, buf); err != nil {
+		panic("reading from crypto/rand failed: " + err.Error())
+	}
+	return buf
+}
+
+func TestCloudKMS_SignDigest(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	mockClient := NewMockCloudKMSClient(ctrl)
+	provider := NewCloudKMSSignatureProviderWithClient(log.Root(), mockClient)
+
+	keyName := "keyName"
+	digest, _ := hexutil.Decode("0x8dabbae6d856bb7ab93bc35b74c1303975a3f70f942d033e8591a9f8c897ae42")
+	derSignature, _ := hexutil.Decode("0x30450221008680faa49fd6653d273fb34393a47efac44b8f4a4de62bbe11a65ee53739e9bb0220350897677c32d67dc1e520d7458c5cca4a7fe49a3e9d74bdef1ec96836148661")
+	pemPublicKey := []byte(CloudKMSPemPublicKey)
+
+	var tests = []struct {
+		testName                 string
+		keyName                  string
+		digest                   []byte
+		respError                error
+		respVerifiedDigestCrc32C bool
+		respSignatureCrc32       uint32
+		wantErr                  bool
+	}{
+		{"happy path", keyName, digest, nil, true, crc32c(derSignature), false},
+		{"req failure", keyName, digest, assert.AnError, true, crc32c(derSignature), true},
+		{"invalid req keyName", "wrongKeyName", digest, nil, true, crc32c(derSignature), true},
+		{"invalid req crc32", keyName, digest, nil, false, crc32c(derSignature), true},
+		{"invalid resp crc32", keyName, digest, nil, true, crc32c([]byte("")), true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.testName, func(t *testing.T) {
+			signRequest := createSignRequestFromDigest(tt.keyName, tt.digest)
+			mockClient.EXPECT().AsymmetricSign(gomock.Any(), signRequest).Return(
+				&kmspb.AsymmetricSignResponse{
+					Name:                 keyName,
+					Signature:            derSignature,
+					VerifiedDigestCrc32C: tt.respVerifiedDigestCrc32C,
+					SignatureCrc32C:      wrapperspb.Int64(int64(tt.respSignatureCrc32)),
+				},
+				tt.respError,
+			)
+
+			getPublicKeyRequest := &kmspb.GetPublicKeyRequest{Name: tt.keyName}
+			mockClient.EXPECT().GetPublicKey(gomock.Any(), getPublicKeyRequest).Return(
+				&kmspb.PublicKey{
+					Pem:       string(pemPublicKey),
+					PemCrc32C: wrapperspb.Int64(int64(crc32c(pemPublicKey))),
+				},
+				nil,
+			)
+			publicKey, _ := decodePublicKeyPEM(pemPublicKey)
+			wantSignature, _ := convertToCompactRecoverableSignature(derSignature, tt.digest, publicKey)
+
+			signature, err := provider.SignDigest(context.TODO(), tt.keyName, tt.digest)
+			if !tt.wantErr {
+				assert.Nil(t, err)
+				assert.Equal(t, wantSignature, signature)
+				// make sure recoverable pubkey is as expected
+				recoveredPublicKey, err := crypto.Ecrecover(tt.digest, signature)
+				assert.Nil(t, err)
+				assert.Equal(t, publicKey, recoveredPublicKey)
+			} else {
+				assert.Error(t, err)
+				assert.Nil(t, signature)
+			}
+		})
+	}
+}
+
+func TestCloudKMS_GetPublicKey(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	mockClient := NewMockCloudKMSClient(ctrl)
+	provider := NewCloudKMSSignatureProviderWithClient(log.Root(), mockClient)
+
+	keyName := "keyName"
+	pemPublicKey := []byte(CloudKMSPemPublicKey)
+	wantPublicKey, _ := hexutil.Decode("0x04429753a0893d9708c1765d1572a5e5ec0c2a841f4dc117fe20744da8850d6bcbc01ffe65e4c1973bfa954f90ffe2c3937e9776f4140090354e813027780d95ae")
+
+	var tests = []struct {
+		testName     string
+		keyName      string
+		respError    error
+		respPemCrc32 uint32
+		wantErr      bool
+	}{
+		{"happy path", keyName, nil, crc32c(pemPublicKey), false},
+		{"req failure", keyName, assert.AnError, crc32c(pemPublicKey), false},
+		{"invalid resp crc32", keyName, assert.AnError, crc32c([]byte("")), true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.testName, func(t *testing.T) {
+			request := &kmspb.GetPublicKeyRequest{Name: tt.keyName}
+			mockClient.EXPECT().GetPublicKey(gomock.Any(), request).Return(
+				&kmspb.PublicKey{
+					Pem:       string(pemPublicKey),
+					PemCrc32C: wrapperspb.Int64(int64(tt.respPemCrc32)),
+				},
+				nil,
+			)
+			publicKey, err := provider.GetPublicKey(context.TODO(), tt.keyName)
+			if !tt.wantErr {
+				assert.Nil(t, err)
+				assert.Equal(t, wantPublicKey, publicKey)
+			} else {
+				assert.Error(t, err)
+				assert.Nil(t, publicKey)
+			}
+		})
+	}
+}
+
+// TestVerifySignatureFromRecoveredPublicKey tests that the compact signature can
+// recover a publicKey that can be used to verify the original DER signature.
+// Since all other reference implementations produce compact, recoverable signatures already,
+// this serves as the test that converToCompactSignture and calculateRecoveryID produce expected results,
+func TestVerifySignatureFromRecoveredPublicKey(t *testing.T) {
+	key := generateKey()
+	pubKey := crypto.FromECDSAPub(&key.PublicKey)
+
+	const TestCount = 1000
+	for i := 0; i < TestCount; i++ {
+		digest := csprngEntropy(32)
+		derSig, err := ecdsa.SignASN1(rand.Reader, key, digest)
+		if err != nil {
+			panic(err)
+		}
+
+		sig, err := convertToCompactSignature(derSig)
+		assert.Nil(t, err)
+		assert.Len(t, sig, 64)
+		assert.Nil(t, compactSignatureMalleabilityCheck(sig))
+
+		recId, err := calculateRecoveryID(sig, digest, pubKey)
+		assert.Nil(t, err)
+		assert.GreaterOrEqual(t, recId, 0)
+		assert.Less(t, recId, 4)
+
+		sig = append(sig, byte(recId))
+		recoveredRawPubKey, err := secp256k1.RecoverPubkey(digest, sig)
+		assert.Nil(t, err)
+
+		recoveredPubKey, err := crypto.UnmarshalPubkey(recoveredRawPubKey)
+		require.NoError(t, err)
+
+		assert.True(t, ecdsa.VerifyASN1(recoveredPubKey, digest, derSig))
+	}
+}

op-signer/service/provider/mock_kms.go

@@ -0,0 +1,77 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/ethereum-optimism/infra/op-signer/service/provider (interfaces: CloudKMSClient)
+
+// Package provider is a generated GoMock package.
+package provider
+
+import (
+	context "context"
+	reflect "reflect"
+
+	kmspb "cloud.google.com/go/kms/apiv1/kmspb"
+	gomock "github.com/golang/mock/gomock"
+	gax "github.com/googleapis/gax-go/v2"
+)
+
+// MockCloudKMSClient is a mock of CloudKMSClient interface.
+type MockCloudKMSClient struct {
+	ctrl     *gomock.Controller
+	recorder *MockCloudKMSClientMockRecorder
+}
+
+// MockCloudKMSClientMockRecorder is the mock recorder for MockCloudKMSClient.
+type MockCloudKMSClientMockRecorder struct {
+	mock *MockCloudKMSClient
+}
+
+// NewMockCloudKMSClient creates a new mock instance.
+func NewMockCloudKMSClient(ctrl *gomock.Controller) *MockCloudKMSClient {
+	mock := &MockCloudKMSClient{ctrl: ctrl}
+	mock.recorder = &MockCloudKMSClientMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use.
+func (m *MockCloudKMSClient) EXPECT() *MockCloudKMSClientMockRecorder {
+	return m.recorder
+}
+
+// AsymmetricSign mocks base method.
+func (m *MockCloudKMSClient) AsymmetricSign(arg0 context.Context, arg1 *kmspb.AsymmetricSignRequest, arg2 ...gax.CallOption) (*kmspb.AsymmetricSignResponse, error) {
+	m.ctrl.T.Helper()
+	varargs := []interface{}{arg0, arg1}
+	for _, a := range arg2 {
+		varargs = append(varargs, a)
+	}
+	ret := m.ctrl.Call(m, "AsymmetricSign", varargs...)
+	ret0, _ := ret[0].(*kmspb.AsymmetricSignResponse)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// AsymmetricSign indicates an expected call of AsymmetricSign.
+func (mr *MockCloudKMSClientMockRecorder) AsymmetricSign(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	varargs := append([]interface{}{arg0, arg1}, arg2...)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AsymmetricSign", reflect.TypeOf((*MockCloudKMSClient)(nil).AsymmetricSign), varargs...)
+}
+
+// GetPublicKey mocks base method.
+func (m *MockCloudKMSClient) GetPublicKey(arg0 context.Context, arg1 *kmspb.GetPublicKeyRequest, arg2 ...gax.CallOption) (*kmspb.PublicKey, error) {
+	m.ctrl.T.Helper()
+	varargs := []interface{}{arg0, arg1}
+	for _, a := range arg2 {
+		varargs = append(varargs, a)
+	}
+	ret := m.ctrl.Call(m, "GetPublicKey", varargs...)
+	ret0, _ := ret[0].(*kmspb.PublicKey)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// GetPublicKey indicates an expected call of GetPublicKey.
+func (mr *MockCloudKMSClientMockRecorder) GetPublicKey(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	varargs := append([]interface{}{arg0, arg1}, arg2...)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetPublicKey", reflect.TypeOf((*MockCloudKMSClient)(nil).GetPublicKey), varargs...)
+}

op-signer/service/provider/mock_provider.go

@@ -0,0 +1,65 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: github.com/ethereum-optimism/infra/op-signer/service/provider (interfaces: SignatureProvider)
+
+// Package provider is a generated GoMock package.
+package provider
+
+import (
+	context "context"
+	reflect "reflect"
+
+	gomock "github.com/golang/mock/gomock"
+)
+
+// MockSignatureProvider is a mock of SignatureProvider interface.
+type MockSignatureProvider struct {
+	ctrl     *gomock.Controller
+	recorder *MockSignatureProviderMockRecorder
+}
+
+// MockSignatureProviderMockRecorder is the mock recorder for MockSignatureProvider.
+type MockSignatureProviderMockRecorder struct {
+	mock *MockSignatureProvider
+}
+
+// NewMockSignatureProvider creates a new mock instance.
+func NewMockSignatureProvider(ctrl *gomock.Controller) *MockSignatureProvider {
+	mock := &MockSignatureProvider{ctrl: ctrl}
+	mock.recorder = &MockSignatureProviderMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use.
+func (m *MockSignatureProvider) EXPECT() *MockSignatureProviderMockRecorder {
+	return m.recorder
+}
+
+// GetPublicKey mocks base method.
+func (m *MockSignatureProvider) GetPublicKey(arg0 context.Context, arg1 string) ([]byte, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetPublicKey", arg0, arg1)
+	ret0, _ := ret[0].([]byte)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// GetPublicKey indicates an expected call of GetPublicKey.
+func (mr *MockSignatureProviderMockRecorder) GetPublicKey(arg0, arg1 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetPublicKey", reflect.TypeOf((*MockSignatureProvider)(nil).GetPublicKey), arg0, arg1)
+}
+
+// SignDigest mocks base method.
+func (m *MockSignatureProvider) SignDigest(arg0 context.Context, arg1 string, arg2 []byte) ([]byte, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "SignDigest", arg0, arg1, arg2)
+	ret0, _ := ret[0].([]byte)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// SignDigest indicates an expected call of SignDigest.
+func (mr *MockSignatureProviderMockRecorder) SignDigest(arg0, arg1, arg2 interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SignDigest", reflect.TypeOf((*MockSignatureProvider)(nil).SignDigest), arg0, arg1, arg2)
+}

op-signer/service/provider/provider.go

@@ -0,0 +1,9 @@
+//go:generate mockgen -destination=mock_provider.go -package=provider github.com/ethereum-optimism/infra/op-signer/service/provider SignatureProvider
+package provider
+
+import "context"
+
+type SignatureProvider interface {
+	SignDigest(ctx context.Context, keyName string, digest []byte) ([]byte, error)
+	GetPublicKey(ctx context.Context, keyName string) ([]byte, error)
+}

op-signer/service/service.go

@@ -0,0 +1,148 @@
+package service
+
+import (
+	"context"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/rpc"
+	"github.com/prometheus/client_golang/prometheus"
+
+	"github.com/ethereum-optimism/infra/op-signer/service/provider"
+	oprpc "github.com/ethereum-optimism/optimism/op-service/rpc"
+	"github.com/ethereum-optimism/optimism/op-service/signer"
+)
+
+type SignerService struct {
+	logger   log.Logger
+	config   SignerServiceConfig
+	provider provider.SignatureProvider
+}
+
+func NewSignerService(logger log.Logger, config SignerServiceConfig) *SignerService {
+	return NewSignerServiceWithProvider(logger, config, provider.NewCloudKMSSignatureProvider(logger))
+}
+
+func NewSignerServiceWithProvider(
+	logger log.Logger,
+	config SignerServiceConfig,
+	provider provider.SignatureProvider,
+) *SignerService {
+	return &SignerService{logger, config, provider}
+}
+
+func (s *SignerService) RegisterAPIs(server *oprpc.Server) {
+	server.AddAPI(rpc.API{
+		Namespace: "eth",
+		Service:   s,
+	})
+}
+
+func containsNormalized(s []string, e string) bool {
+	for _, a := range s {
+		if strings.EqualFold(a, e) {
+			return true
+		}
+	}
+	return false
+}
+
+// SignTransaction will sign the given transaction with the key configured for the authenticated client
+func (s *SignerService) SignTransaction(ctx context.Context, args signer.TransactionArgs) (hexutil.Bytes, error) {
+	clientInfo := ClientInfoFromContext(ctx)
+	authConfig, err := s.config.GetAuthConfigForClient(clientInfo.ClientName)
+	if err != nil {
+		return nil, rpc.HTTPError{StatusCode: 403, Status: "Forbidden", Body: []byte(err.Error())}
+	}
+
+	labels := prometheus.Labels{"client": clientInfo.ClientName, "status": "error", "error": ""}
+	defer func() {
+		MetricSignTransactionTotal.With(labels).Inc()
+	}()
+
+	if err := args.Check(); err != nil {
+		s.logger.Warn("invalid signing arguments", "err", err)
+		labels["error"] = "invalid_transaction"
+		return nil, &InvalidTransactionError{message: err.Error()}
+	}
+
+	if len(authConfig.ToAddresses) > 0 && !containsNormalized(authConfig.ToAddresses, args.To.Hex()) {
+		return nil, &UnauthorizedTransactionError{"to address not authorized"}
+	}
+	if len(authConfig.MaxValue) > 0 && args.Value.ToInt().Cmp(authConfig.MaxValueToInt()) > 0 {
+		return nil, &UnauthorizedTransactionError{"value exceeds maximum"}
+	}
+
+	txData, err := args.ToTransactionData()
+	if err != nil {
+		labels["error"] = "transaction_args_error"
+		return nil, &InvalidTransactionError{err.Error()}
+	}
+	tx := types.NewTx(txData)
+
+	txSigner := types.LatestSignerForChainID(tx.ChainId())
+	digest := txSigner.Hash(tx)
+
+	signature, err := s.provider.SignDigest(ctx, authConfig.KeyName, digest.Bytes())
+	if err != nil {
+		labels["error"] = "sign_error"
+		return nil, &InvalidTransactionError{err.Error()}
+	}
+
+	signed, err := tx.WithSignature(txSigner, signature)
+	if err != nil {
+		labels["error"] = "invalid_transaction_error"
+		return nil, &InvalidTransactionError{err.Error()}
+	}
+	signerFrom, err := txSigner.Sender(signed)
+	if err != nil {
+		labels["error"] = "sign_error"
+		return nil, &InvalidTransactionError{err.Error()}
+	}
+
+	// sanity check that we used the right account
+	if args.From != nil && *args.From != signerFrom {
+		s.logger.Warn("user is trying to sign with different account than actual signer-provider",
+			"provider", signerFrom, "request", *args.From)
+		labels["error"] = "sign_error"
+		return nil, &InvalidTransactionError{"unexpected from address"}
+	}
+
+	txraw, err := signed.MarshalBinary()
+	if err != nil {
+		labels["error"] = "transaction_marshal_error"
+		return nil, &InvalidTransactionError{err.Error()}
+	}
+
+	labels["status"] = "success"
+	txTo := ""
+	if tx.To() != nil {
+		txTo = tx.To().Hex()
+	}
+
+	s.logger.Info(
+		"Signed transaction",
+		"digest", hexutil.Encode(digest.Bytes()),
+		"client.name", clientInfo.ClientName,
+		"client.keyname", authConfig.KeyName,
+		"tx.type", tx.Type(),
+		"tx.raw", hexutil.Encode(txraw),
+		"tx.value", tx.Value(),
+		"tx.to", txTo,
+		"tx.nonce", tx.Nonce(),
+		"tx.gas", tx.Gas(),
+		"tx.gasprice", tx.GasPrice(),
+		"tx.gastipcap", tx.GasTipCap(),
+		"tx.gasfeecap", tx.GasFeeCap(),
+		"tx.type", tx.Type(),
+		"tx.hash", tx.Hash().Hex(),
+		"tx.chainid", tx.ChainId(),
+		"tx.blobhashes", tx.BlobHashes(),
+		"tx.blobfeecap", tx.BlobGasFeeCap(),
+		"signature", hexutil.Encode(signature),
+	)
+
+	return hexutil.Bytes(txraw), nil
+}

op-signer/service/service_test.go

@@ -0,0 +1,182 @@
+package service
+
+import (
+	"context"
+	"errors"
+	"math/big"
+	"testing"
+
+	"github.com/golang/mock/gomock"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/holiman/uint256"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/rpc"
+
+	"github.com/ethereum-optimism/infra/op-signer/service/provider"
+	clientSigner "github.com/ethereum-optimism/optimism/op-service/signer"
+)
+
+func createEIP1559Tx() *types.Transaction {
+	aa := common.HexToAddress("0x000000000000000000000000000000000000aaaa")
+	accesses := types.AccessList{types.AccessTuple{
+		Address:     aa,
+		StorageKeys: []common.Hash{{0}},
+	}}
+	txdata := &types.DynamicFeeTx{
+		ChainID:    params.AllEthashProtocolChanges.ChainID,
+		Nonce:      0,
+		To:         &aa,
+		Gas:        30000,
+		GasFeeCap:  big.NewInt(1),
+		GasTipCap:  big.NewInt(1),
+		AccessList: accesses,
+		Data:       []byte{},
+		Value:      big.NewInt(1),
+	}
+	tx := types.NewTx(txdata)
+	return tx
+}
+
+func createBlobTx() *types.Transaction {
+	aa := common.HexToAddress("0x000000000000000000000000000000000000aaaa")
+	accesses := types.AccessList{types.AccessTuple{
+		Address:     aa,
+		StorageKeys: []common.Hash{{0}},
+	}}
+
+	txdata := &types.BlobTx{
+		ChainID:    uint256.MustFromBig(params.AllEthashProtocolChanges.ChainID),
+		Nonce:      0,
+		To:         aa,
+		Gas:        30000,
+		GasFeeCap:  uint256.NewInt(1),
+		GasTipCap:  uint256.NewInt(1),
+		AccessList: accesses,
+		Data:       []byte{},
+		Value:      uint256.NewInt(1),
+		BlobFeeCap: uint256.NewInt(1),
+		BlobHashes: []common.Hash{common.HexToHash("c0ffee")},
+	}
+	tx := types.NewTx(txdata)
+	return tx
+}
+
+var config = SignerServiceConfig{
+	Auth: []AuthConfig{
+		{ClientName: "client.oplabs.co", KeyName: "keyName"},
+		{ClientName: "alt-client.oplabs.co", KeyName: "altKeyName"},
+		{ClientName: "authorized-to.oplabs.co", KeyName: "keyName", ToAddresses: []string{"0x000000000000000000000000000000000000Aaaa"}},
+		{ClientName: "unauthorized-to.oplabs.co", KeyName: "keyName", ToAddresses: []string{"0x000000000000000000000000000000000000bbbb"}},
+		{ClientName: "within-max-value.oplabs.co", KeyName: "keyName", MaxValue: hexutil.EncodeBig(big.NewInt(2))},
+		{ClientName: "exceeds-max-value.oplabs.co", KeyName: "keyName", MaxValue: hexutil.EncodeBig(big.NewInt(0))},
+	},
+}
+
+type testCase struct {
+	name     string
+	template func() *types.Transaction
+}
+
+var testTxs = []testCase{
+	{"regular", createEIP1559Tx},
+	{"blob-tx", createBlobTx},
+}
+
+func TestSignTransaction(t *testing.T) {
+	for _, tc := range testTxs {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			testSignTransaction(t, tc.template())
+		})
+	}
+}
+
+func testSignTransaction(t *testing.T, tx *types.Transaction) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	signer := types.LatestSignerForChainID(tx.ChainId())
+	digest := signer.Hash(tx).Bytes()
+
+	priv, err := crypto.GenerateKey()
+	require.NoError(t, err)
+
+	sender := crypto.PubkeyToAddress(priv.PublicKey)
+
+	signature, err := crypto.Sign(digest, priv)
+	require.NoError(t, err)
+
+	args := clientSigner.NewTransactionArgsFromTransaction(tx.ChainId(), nil, tx)
+	missingNonce := clientSigner.NewTransactionArgsFromTransaction(tx.ChainId(), nil, tx)
+	missingNonce.Nonce = nil
+
+	validFrom := clientSigner.NewTransactionArgsFromTransaction(tx.ChainId(), nil, tx)
+	validFrom.From = &sender
+
+	invalidFrom := clientSigner.NewTransactionArgsFromTransaction(tx.ChainId(), nil, tx)
+	random := common.HexToAddress("1234")
+	invalidFrom.From = &random
+
+	// signature, _ := hexutil.Decode("0x5392c93b50eb9e3412ab43d378048d4f7d644f3cea02acb529f07e2babba1d3a332377f4abe24a40030b3ff6bff3413a44364aad4665f4e24117466328ce8d3600")
+
+	tests := []struct {
+		testName    string
+		args        clientSigner.TransactionArgs
+		digest      []byte
+		clientName  string
+		wantKeyName string
+		wantErrCode int
+	}{
+		{"happy path", *args, digest, "client.oplabs.co", "keyName", 0},
+		{"nonce not specified", *missingNonce, digest, "client.oplabs.co", "keyName", -32010},
+		{"happy path - different client and key", *args, digest, "alt-client.oplabs.co", "altKeyName", 0},
+		{"client not authorized", *args, digest, "forbidden-client.oplabs.co", "keyName", 403},
+		{"client empty", *args, digest, "", "", 403},
+		{"authorized to address", *args, digest, "authorized-to.oplabs.co", "keyName", 0},
+		{"unauthorized to address", *args, digest, "unauthorized-to.oplabs.co", "keyName", -32011},
+		{"within max value", *args, digest, "within-max-value.oplabs.co", "keyName", 0},
+		{"exceeds max value", *args, digest, "exceeds-max-value.oplabs.co", "keyName", -32011},
+		{"valid from", *validFrom, digest, "client.oplabs.co", "keyName", 0},
+		{"invalid from", *invalidFrom, digest, "client.oplabs.co", "keyName", -32010},
+	}
+	for _, tt := range tests {
+		t.Run(tt.testName, func(t *testing.T) {
+			mockSignatureProvider := provider.NewMockSignatureProvider(ctrl)
+			service := NewSignerServiceWithProvider(log.Root(), config, mockSignatureProvider)
+
+			ctx := context.WithValue(context.TODO(), clientInfoContextKey{}, ClientInfo{ClientName: tt.clientName})
+			if tt.wantErrCode == 0 || tt.testName == "invalid from" {
+				mockSignatureProvider.EXPECT().
+					SignDigest(ctx, tt.wantKeyName, tt.digest).
+					Return(signature, nil)
+			}
+			resp, err := service.SignTransaction(ctx, tt.args)
+			if tt.wantErrCode == 0 {
+				assert.Nil(t, err)
+				if assert.NotNil(t, resp) {
+					assert.NotEmpty(t, resp)
+				}
+			} else {
+				assert.NotNil(t, err)
+				assert.Nil(t, resp)
+				var rpcErr rpc.Error
+				var httpErr rpc.HTTPError
+				if errors.As(err, &rpcErr) {
+					assert.Equal(t, tt.wantErrCode, rpcErr.ErrorCode())
+				} else if errors.As(err, &httpErr) {
+					assert.Equal(t, tt.wantErrCode, httpErr.StatusCode)
+				} else {
+					assert.Fail(t, "returned error is not an rpc.Error or rpc.HTTPError")
+				}
+			}
+		})
+	}
+}

op-signer/test-rpc.json

@@ -0,0 +1,53 @@
+[
+  {
+    "id": "1",
+    "jsonrpc": "2.0",
+    "method": "eth_signTransaction",
+    "params": [
+      {
+        "to": "0x000000000000000000000000000000000000aaaa",
+        "gas": "0x7530",
+        "gasPrice": null,
+        "maxFeePerGas": "0x1",
+        "maxPriorityFeePerGas": "0x1",
+        "value": "0x1",
+        "nonce": "0x0",
+        "data": "0x",
+        "accessList": [
+          {
+            "address": "0x000000000000000000000000000000000000aaaa",
+            "storageKeys": [
+              "0x0000000000000000000000000000000000000000000000000000000000000000"
+            ]
+          }
+        ],
+        "chainId": "0x539"
+      }
+    ]
+  },
+  {
+    "id": "1",
+    "jsonrpc": "2.0",
+    "method": "eth_signTransaction",
+    "params": [
+      {
+        "to": "0x000000000000000000000000000000000000aaaa",
+        "gas": "0x7530",
+        "gasPrice": null,
+        "maxFeePerGas": "0x1",
+        "maxPriorityFeePerGas": "0x1",
+        "value": "0x1",
+        "data": "0x",
+        "accessList": [
+          {
+            "address": "0x000000000000000000000000000000000000aaaa",
+            "storageKeys": [
+              "0x0000000000000000000000000000000000000000000000000000000000000000"
+            ]
+          }
+        ],
+        "chainId": "0x539"
+      }
+    ]
+  }
+]

op-txproxy/.gitignore

@@ -0,0 +1 @@
+bin

op-txproxy/Dockerfile

@@ -0,0 +1,18 @@
+FROM golang:1.21.3-alpine3.18 as builder
+
+COPY ./op-txproxy /app
+
+WORKDIR /app
+RUN apk --no-cache add make jq bash git alpine-sdk
+RUN make build
+
+FROM alpine:3.18
+RUN apk --no-cache add ca-certificates
+
+RUN addgroup -S app && adduser -S app -G app
+USER app
+WORKDIR /app
+
+COPY --from=builder /app/bin/op-txproxy /app
+
+ENTRYPOINT ["/app/op-txproxy"]

op-txproxy/Makefile

@@ -0,0 +1,28 @@
+GIT_COMMIT := $(shell git rev-parse HEAD)
+GIT_DATE := $(shell git show -s --format='%ct')
+
+LDFLAGSSTRING +=-X main.GitCommit=$(GIT_COMMIT)
+LDFLAGSSTRING +=-X main.GitDate=$(GITDGIT_DATEATE)
+LDFLAGSSTRING +=-X main.Version=$(OP_CONDUCTOR_MON_VERSION)
+LDFLAGS := -ldflags "$(LDFLAGSSTRING)"
+
+
+all: build
+
+build:
+	env GO111MODULE=on go build -v $(LDFLAGS) -o ./bin/op-txproxy ./cmd
+
+clean:
+	rm ./bin/op-txproxy
+
+test:
+	go test -v ./...
+
+lint:
+	golangci-lint run ./...
+
+.PHONY: \
+	build \
+	clean \
+	test \
+	lint

op-txproxy/README.md

@@ -0,0 +1,36 @@
+# op-txproxy
+
+A supplemental passthrough proxy for some execution engine endpoints. This proxy does not forward all rpc traffic and only exposes a specific set of endpoints.
+Operationally, the public ingress proxy should  only re-route requests for these endpoints.
+
+```mermaid
+stateDiagram-v2
+    proxyd --> txproxy: intercepted methods
+    proxyd --> backend: unintercepted methods
+    txproxy --> backend
+```
+
+## Setup
+Install go 1.21
+```
+make build
+./bin/op-txproxy --help
+```
+
+## Endpoints
+
+### eth_sendRawTransactionConditional
+
+An outcome of how to integrate this [spec](https://notes.ethereum.org/@yoav/SkaX2lS9j) safely for permissionless 4337 bundler participation. This solution in the design doc [proposal](https://github.com/ethereum-optimism/design-docs/blob/main/ecosystem/sendRawTransactionConditional/proposal.md)
+requires a validating proxy that can be horizontally scaled and pre-emptively reject invalid conditional transaction. The implemented endpoint covers
+these objectives:
+1. **Auth**. preemptively put in place to enable a variety of auth policies (allowlist, rate limits, etc).
+
+    The caller authenticates themselves with any valid ECDSA-secp256k1 key, like an Ethereum key. The computed signature is over the [EIP-191](https://eips.ethereum.org/EIPS/eip-191) hash of the request body (up to the 5MB request body limit).
+
+    With the signature and signing address, the request is authenticated via the `X-Optimism-Signature` header of the request with the value `<public key address>: <signature>`.
+
+2. **Rate Limits**. global rate limits on the endpoint are applied here.
+2. **Rejection Switch**. this proxy can be rolled with a flag/env switch to reject conditional transaction without needing to interrupt the execution engine.
+3. **Basic Validation**. stateless validation is done in the endpoint to reject invalid conditional transactions and apply additional restricts on the usage (only 4337 entrypoint tx target support).
+4. **Metrics**. performance of this endpoint can be observed in order to inform adjustments to rate limits, shutoff, or auth policies to implement.

op-txproxy/auth_handler.go

@@ -0,0 +1,101 @@
+package op_txproxy
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"net/http"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/accounts"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+var (
+	defaultBodyLimit = 5 * 1024 * 1024 // default in op-geth
+
+	DefaultAuthHeaderKey = "X-Optimism-Signature"
+)
+
+type authHandler struct {
+	headerKey string
+	next      http.Handler
+}
+
+// This middleware detects when authentication information is present on the request. If
+// so, it will validate and set the caller in the request context. It does not reject
+// if authentication information is missing. It is up to the request handler to do so via
+// the missing `AuthContext`
+//   - NOTE: only up to the default body limit (5MB) is read when constructing the text hash
+//     that is signed over by the caller
+func AuthMiddleware(headerKey string) func(next http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return &authHandler{headerKey, next}
+	}
+}
+
+type authContextKey struct{}
+
+type AuthContext struct {
+	Caller common.Address
+}
+
+// ServeHTTP serves JSON-RPC requests over HTTP, implements http.Handler
+func (h *authHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	authHeader := r.Header.Get(h.headerKey)
+	if authHeader == "" {
+		h.next.ServeHTTP(w, r)
+		return
+	}
+	authElems := strings.Split(authHeader, ":")
+	if len(authElems) != 2 {
+		http.Error(w, "misformatted auth header", http.StatusBadRequest)
+		return
+	}
+
+	if r.Body == nil {
+		// edge case from unit tests
+		r.Body = io.NopCloser(bytes.NewBuffer(nil))
+	}
+
+	// Since this middleware runs prior to the server, we need to manually apply the body limit when reading.
+	bodyBytes, err := io.ReadAll(io.LimitReader(r.Body, int64(defaultBodyLimit)))
+	if err != nil {
+		http.Error(w, "unable to parse request body", http.StatusInternalServerError)
+		return
+	}
+
+	r.Body = struct {
+		io.Reader
+		io.Closer
+	}{
+		io.MultiReader(bytes.NewReader(bodyBytes), r.Body),
+		r.Body,
+	}
+
+	txtHash := accounts.TextHash(bodyBytes)
+	caller, signature := common.HexToAddress(authElems[0]), common.FromHex(authElems[1])
+	sigPubKey, err := crypto.SigToPub(txtHash, signature)
+	if err != nil {
+		http.Error(w, "invalid authentication signature", http.StatusBadRequest)
+		return
+	}
+
+	if caller != crypto.PubkeyToAddress(*sigPubKey) {
+		http.Error(w, "mismatched recovered signer", http.StatusBadRequest)
+		return
+	}
+
+	// Set the authenticated caller in the context
+	newCtx := context.WithValue(r.Context(), authContextKey{}, &AuthContext{caller})
+	h.next.ServeHTTP(w, r.WithContext(newCtx))
+}
+
+func AuthFromContext(ctx context.Context) *AuthContext {
+	auth, ok := ctx.Value(authContextKey{}).(*AuthContext)
+	if !ok {
+		return nil
+	}
+	return auth
+}

op-txproxy/auth_handler_test.go

@@ -0,0 +1,148 @@
+package op_txproxy
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	oprpc "github.com/ethereum-optimism/optimism/op-service/rpc"
+
+	"github.com/ethereum/go-ethereum/accounts"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/rpc"
+
+	"github.com/stretchr/testify/require"
+)
+
+var pingHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "ping")
+})
+
+func TestAuthHandlerMissingAuth(t *testing.T) {
+	handler := authHandler{next: pingHandler}
+
+	rr := httptest.NewRecorder()
+	r, _ := http.NewRequest("GET", "/", nil)
+	handler.ServeHTTP(rr, r)
+
+	// simply forwards the request
+	require.Equal(t, http.StatusOK, rr.Code)
+	require.Equal(t, "ping", rr.Body.String())
+}
+
+func TestAuthHandlerBadHeader(t *testing.T) {
+	handler := authHandler{headerKey: "auth", next: pingHandler}
+
+	rr := httptest.NewRecorder()
+	r, _ := http.NewRequest("GET", "/", nil)
+	r.Header.Set("auth", "foobarbaz")
+
+	handler.ServeHTTP(rr, r)
+	require.Equal(t, http.StatusBadRequest, rr.Code)
+}
+
+func TestAuthHandlerBadSignature(t *testing.T) {
+	handler := authHandler{headerKey: "auth", next: pingHandler}
+
+	rr := httptest.NewRecorder()
+	r, _ := http.NewRequest("GET", "/", nil)
+	r.Header.Set("auth", fmt.Sprintf("%s:%s", common.HexToAddress("0xa"), "foobar"))
+
+	handler.ServeHTTP(rr, r)
+	require.Equal(t, http.StatusBadRequest, rr.Code)
+}
+
+func TestAuthHandlerMismatchedCaller(t *testing.T) {
+	handler := authHandler{headerKey: "auth", next: pingHandler}
+
+	rr := httptest.NewRecorder()
+	r, _ := http.NewRequest("GET", "/", strings.NewReader("body"))
+
+	privKey, _ := crypto.GenerateKey()
+	sig, _ := crypto.Sign(accounts.TextHash([]byte("body")), privKey)
+	r.Header.Set("auth", fmt.Sprintf("%s:%s", common.HexToAddress("0xa"), sig))
+
+	handler.ServeHTTP(rr, r)
+	require.Equal(t, http.StatusBadRequest, rr.Code)
+}
+
+func TestAuthHandlerSetContext(t *testing.T) {
+	var ctx *AuthContext
+	ctxHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ctx = AuthFromContext(r.Context())
+		w.WriteHeader(http.StatusOK)
+	})
+
+	handler := authHandler{headerKey: "auth", next: ctxHandler}
+
+	rr := httptest.NewRecorder()
+	body := bytes.NewBufferString("body")
+	r, _ := http.NewRequest("GET", "/", body)
+
+	privKey, _ := crypto.GenerateKey()
+	sig, _ := crypto.Sign(accounts.TextHash(body.Bytes()), privKey)
+	addr := crypto.PubkeyToAddress(privKey.PublicKey)
+	r.Header.Set("auth", fmt.Sprintf("%s:%s", addr, common.Bytes2Hex(sig)))
+
+	handler.ServeHTTP(rr, r)
+	require.Equal(t, http.StatusOK, rr.Code)
+
+	require.NotNil(t, ctx)
+	require.Equal(t, addr, ctx.Caller)
+}
+
+func TestAuthHandlerRpcMiddleware(t *testing.T) {
+	rpcServer := oprpc.NewServer("127.0.0.1", 0, "", oprpc.WithMiddleware(AuthMiddleware("auth")))
+	require.NoError(t, rpcServer.Start())
+	t.Cleanup(func() { _ = rpcServer.Stop() })
+
+	url := fmt.Sprintf("http://%s", rpcServer.Endpoint())
+	clnt, err := rpc.Dial(url)
+	require.NoError(t, err)
+	defer clnt.Close()
+
+	// pass without auth (default handler does not deny)
+	err = clnt.CallContext(context.Background(), nil, "rpc_modules")
+	require.Nil(t, err)
+
+	// denied with bad auth header
+	clnt.SetHeader("auth", "foobar")
+	err = clnt.CallContext(context.Background(), nil, "rpc_modules")
+	require.NotNil(t, err)
+}
+
+func TestAuthHandlerRequestBodyLimit(t *testing.T) {
+	var body []byte
+	bodyHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		body, _ = io.ReadAll(r.Body)
+		w.WriteHeader(http.StatusOK)
+	})
+
+	handler := authHandler{headerKey: "auth", next: bodyHandler}
+
+	// only up to limit is read when validating the request body
+	authBody := strings.Repeat("*", defaultBodyLimit)
+	excess := strings.Repeat("-", 10)
+
+	rr := httptest.NewRecorder()
+	r, _ := http.NewRequest("GET", "/", strings.NewReader(authBody+excess))
+
+	// sign over just the auth body
+	privKey, _ := crypto.GenerateKey()
+	sig, _ := crypto.Sign(accounts.TextHash([]byte(authBody)), privKey)
+	addr := crypto.PubkeyToAddress(privKey.PublicKey)
+	r.Header.Set("auth", fmt.Sprintf("%s:%s", addr, common.Bytes2Hex(sig)))
+
+	// Auth handler successfully only parses through the max body limit
+	handler.ServeHTTP(rr, r)
+	require.Equal(t, http.StatusOK, rr.Code, rr.Body)
+
+	// The next handler has the full request body present
+	require.Len(t, body, len(authBody)+len(excess))
+}

op-txproxy/cli.go

@@ -0,0 +1,49 @@
+package op_txproxy
+
+import (
+	opservice "github.com/ethereum-optimism/optimism/op-service"
+
+	"github.com/urfave/cli/v2"
+)
+
+const (
+	SendRawTransactionConditionalEnabledFlagName   = "sendRawTxConditional.enabled"
+	SendRawTransactionConditionalBackendFlagName   = "sendRawTxConditional.backend"
+	SendRawTransactionConditionalRateLimitFlagName = "sendRawTxConditional.ratelimit"
+)
+
+type CLIConfig struct {
+	SendRawTransactionConditionalEnabled   bool
+	SendRawTransactionConditionalBackend   string
+	SendRawTransactionConditionalRateLimit uint64
+}
+
+func CLIFlags(envPrefix string) []cli.Flag {
+	return []cli.Flag{
+		&cli.BoolFlag{
+			Name:    SendRawTransactionConditionalEnabledFlagName,
+			Usage:   "Decider if eth_sendRawTransactionConditional requests should passthrough or be rejected",
+			Value:   true,
+			EnvVars: opservice.PrefixEnvVar(envPrefix, "SENDRAWTXCONDITIONAL_ENABLED"),
+		},
+		&cli.StringSliceFlag{
+			Name:    SendRawTransactionConditionalBackendFlagName,
+			Usage:   "block builder to broadcast conditional transactions",
+			EnvVars: opservice.PrefixEnvVar(envPrefix, "SENDRAWTXCONDITIONAL_BACKENDS"),
+		},
+		&cli.Uint64Flag{
+			Name:    SendRawTransactionConditionalRateLimitFlagName,
+			Usage:   "Maximum cost -- storage lookups -- allowed for conditional transactions in a given second",
+			Value:   5000,
+			EnvVars: opservice.PrefixEnvVar(envPrefix, "SENDRAWTXCONDITIONAL_RATELIMIT"),
+		},
+	}
+}
+
+func ReadCLIConfig(ctx *cli.Context) CLIConfig {
+	return CLIConfig{
+		SendRawTransactionConditionalEnabled:   ctx.Bool(SendRawTransactionConditionalEnabledFlagName),
+		SendRawTransactionConditionalBackend:   ctx.String(SendRawTransactionConditionalBackendFlagName),
+		SendRawTransactionConditionalRateLimit: ctx.Uint64(SendRawTransactionConditionalRateLimitFlagName),
+	}
+}

op-txproxy/cmd/main.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	optxproxy "github.com/ethereum-optimism/infra/op-txproxy"
+
+	"github.com/ethereum-optimism/optimism/op-service/cliapp"
+	oplog "github.com/ethereum-optimism/optimism/op-service/log"
+	"github.com/ethereum-optimism/optimism/op-service/metrics"
+	"github.com/ethereum-optimism/optimism/op-service/opio"
+	"github.com/ethereum-optimism/optimism/op-service/rpc"
+
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/params"
+
+	"github.com/urfave/cli/v2"
+)
+
+var (
+	GitCommit    = ""
+	GitDate      = ""
+	EnvVarPrefix = "OP_TXPROXY"
+)
+
+func main() {
+	oplog.SetupDefaults()
+
+	app := cli.NewApp()
+	app.Version = params.VersionWithCommit(GitCommit, GitDate)
+	app.Name = "op-txproxy"
+	app.Usage = "Optimism TxProxy Service"
+	app.Description = "Auxiliary service to supplement op-stack transaction pool management"
+	app.Action = cliapp.LifecycleCmd(TxProxyMain)
+
+	logFlags := oplog.CLIFlags(EnvVarPrefix)
+	rpcFlags := rpc.CLIFlags(EnvVarPrefix)
+	backendFlags := optxproxy.CLIFlags(EnvVarPrefix)
+	app.Flags = append(append(backendFlags, rpcFlags...), logFlags...)
+
+	ctx := opio.WithInterruptBlocker(context.Background())
+	if err := app.RunContext(ctx, os.Args); err != nil {
+		log.Crit("Application Failed", "err", err)
+	}
+}
+
+func TxProxyMain(ctx *cli.Context, closeApp context.CancelCauseFunc) (cliapp.Lifecycle, error) {
+	log := oplog.NewLogger(oplog.AppOut(ctx), oplog.ReadCLIConfig(ctx))
+	m := metrics.With(metrics.NewRegistry())
+
+	cfg := optxproxy.ReadCLIConfig(ctx)
+	txproxy, err := optxproxy.NewTxProxy(ctx.Context, log, m, &cfg)
+	if err != nil {
+		return nil, fmt.Errorf("unable to start superchain backend: %w", err)
+	}
+
+	rpcConfig := rpc.ReadCLIConfig(ctx)
+	rpcOpts := []rpc.ServerOption{
+		rpc.WithAPIs(txproxy.GetAPIs()),
+		rpc.WithLogger(log),
+		rpc.WithMiddleware(optxproxy.AuthMiddleware(optxproxy.DefaultAuthHeaderKey)),
+	}
+
+	rpcServer := rpc.NewServer(rpcConfig.ListenAddr, rpcConfig.ListenPort, ctx.App.Version, rpcOpts...)
+	return rpc.NewService(log, rpcServer), nil
+}

op-txproxy/conditional_txs.go

@@ -0,0 +1,140 @@
+package op_txproxy
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/ethereum-optimism/optimism/op-service/client"
+	"github.com/ethereum-optimism/optimism/op-service/metrics"
+	"github.com/ethereum-optimism/optimism/op-service/predeploys"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/rpc"
+
+	"github.com/prometheus/client_golang/prometheus"
+
+	"golang.org/x/time/rate"
+)
+
+var (
+	// errs
+	rateLimitErr             = &rpc.JsonError{Message: "rate limited", Code: params.TransactionConditionalCostExceededMaxErrCode}
+	endpointDisabledErr      = &rpc.JsonError{Message: "endpoint disabled", Code: params.TransactionConditionalRejectedErrCode}
+	missingAuthenticationErr = &rpc.JsonError{Message: "missing authentication", Code: params.TransactionConditionalRejectedErrCode}
+	entrypointSupportErr     = &rpc.JsonError{Message: "only 4337 Entrypoint contract support", Code: params.TransactionConditionalRejectedErrCode}
+)
+
+type ConditionalTxService struct {
+	log log.Logger
+	cfg *CLIConfig
+
+	limiter             *rate.Limiter
+	backend             client.RPC
+	entrypointAddresses map[common.Address]bool
+
+	costSummary prometheus.Summary
+	requests    prometheus.Counter
+	failures    *prometheus.CounterVec
+}
+
+func NewConditionalTxService(ctx context.Context, log log.Logger, m metrics.Factory, cfg *CLIConfig) (*ConditionalTxService, error) {
+	rpc, err := client.NewRPC(ctx, log, cfg.SendRawTransactionConditionalBackend)
+	if err != nil {
+		return nil, fmt.Errorf("failed to dial backend %s: %w", cfg.SendRawTransactionConditionalBackend, err)
+	}
+
+	rpcMetrics := metrics.MakeRPCClientMetrics("backend", m)
+	backend := client.NewInstrumentedRPC(rpc, &rpcMetrics)
+
+	limiter := rate.NewLimiter(rate.Limit(cfg.SendRawTransactionConditionalRateLimit), params.TransactionConditionalMaxCost)
+	entrypointAddresses := map[common.Address]bool{predeploys.EntryPoint_v060Addr: true, predeploys.EntryPoint_v070Addr: true}
+
+	return &ConditionalTxService{
+		log: log,
+		cfg: cfg,
+
+		limiter:             limiter,
+		backend:             backend,
+		entrypointAddresses: entrypointAddresses,
+
+		costSummary: m.NewSummary(prometheus.SummaryOpts{
+			Namespace: MetricsNameSpace,
+			Name:      "txconditional_cost",
+			Help:      "summary of cost observed by *accepted* conditional txs",
+		}),
+		requests: m.NewCounter(prometheus.CounterOpts{
+			Namespace: MetricsNameSpace,
+			Name:      "txconditional_requests",
+			Help:      "number of conditional transaction requests",
+		}),
+		failures: m.NewCounterVec(prometheus.CounterOpts{
+			Namespace: MetricsNameSpace,
+			Name:      "txconditional_failures",
+			Help:      "number of conditional transaction failures",
+		}, []string{"err"}),
+	}, nil
+}
+
+func (s *ConditionalTxService) SendRawTransactionConditional(ctx context.Context, txBytes hexutil.Bytes, cond types.TransactionConditional) (common.Hash, error) {
+	s.requests.Inc()
+	if !s.cfg.SendRawTransactionConditionalEnabled {
+		s.failures.WithLabelValues("disabled").Inc()
+		return common.Hash{}, endpointDisabledErr
+	}
+
+	// Ensure the request is authenticated
+	authInfo := AuthFromContext(ctx)
+	if authInfo == nil {
+		s.failures.WithLabelValues("missing auth").Inc()
+		return common.Hash{}, missingAuthenticationErr
+	}
+
+	// Handle the request. For now, we do nothing with the authenticated signer
+	hash, err := s.sendCondTx(ctx, authInfo.Caller, txBytes, &cond)
+	if err != nil {
+		s.failures.WithLabelValues(err.Error()).Inc()
+		s.log.Error("failed transaction conditional", "caller", authInfo.Caller.String(), "hash", hash.String(), "err", err)
+		return common.Hash{}, err
+	}
+
+	return hash, err
+}
+
+func (s *ConditionalTxService) sendCondTx(ctx context.Context, caller common.Address, txBytes hexutil.Bytes, cond *types.TransactionConditional) (common.Hash, error) {
+	tx := new(types.Transaction)
+	if err := tx.UnmarshalBinary(txBytes); err != nil {
+		return common.Hash{}, fmt.Errorf("failed to unmarshal tx: %w", err)
+	}
+
+	txHash, cost := tx.Hash(), cond.Cost()
+
+	// external checks (tx target, conditional cost & validation)
+	if tx.To() == nil || !s.entrypointAddresses[*tx.To()] {
+		return txHash, entrypointSupportErr
+	}
+	if err := cond.Validate(); err != nil {
+		return txHash, &rpc.JsonError{
+			Message: fmt.Sprintf("failed conditional validation: %s", err),
+			Code:    params.TransactionConditionalRejectedErrCode,
+		}
+	}
+	if cost > params.TransactionConditionalMaxCost {
+		return txHash, &rpc.JsonError{
+			Message: fmt.Sprintf("conditional cost, %d, exceeded max: %d", cost, params.TransactionConditionalMaxCost),
+			Code:    params.TransactionConditionalCostExceededMaxErrCode,
+		}
+	}
+
+	// enforce rate limit on the cost to be observed
+	if err := s.limiter.WaitN(ctx, cost); err != nil {
+		return txHash, rateLimitErr
+	}
+
+	s.costSummary.Observe(float64(cost))
+	s.log.Info("broadcasting conditional transaction", "caller", caller.String(), "hash", txHash.String())
+	return txHash, s.backend.CallContext(ctx, nil, "eth_sendRawTransactionConditional", txBytes, cond)
+}

op-txproxy/conditional_txs_test.go

@@ -0,0 +1,135 @@
+package op_txproxy
+
+import (
+	"context"
+	"math/big"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/ethereum-optimism/optimism/op-service/metrics"
+	"github.com/ethereum-optimism/optimism/op-service/predeploys"
+	"github.com/ethereum-optimism/optimism/op-service/testlog"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/rlp"
+	"github.com/ethereum/go-ethereum/rpc"
+
+	"github.com/stretchr/testify/require"
+)
+
+type testBackend struct{}
+
+func (b *testBackend) SendRawTransactionConditional(ctx context.Context, txBytes hexutil.Bytes, cond types.TransactionConditional) (common.Hash, error) {
+	return common.Hash{}, nil
+}
+
+func setupSvc(t *testing.T) *ConditionalTxService {
+	// setup no-op backend
+	srv := rpc.NewServer()
+	t.Cleanup(func() { srv.Stop() })
+	require.NoError(t, srv.RegisterName("eth", new(testBackend)))
+
+	httpSrv := httptest.NewServer(srv)
+	t.Cleanup(func() { httpSrv.Close() })
+
+	log := testlog.Logger(t, log.LevelInfo)
+	cfg := &CLIConfig{
+		SendRawTransactionConditionalEnabled:   true,
+		SendRawTransactionConditionalBackend:   httpSrv.URL,
+		SendRawTransactionConditionalRateLimit: 10_000,
+	}
+
+	svc, err := NewConditionalTxService(context.Background(), log, metrics.With(metrics.NewRegistry()), cfg)
+	require.NoError(t, err)
+
+	return svc
+}
+
+func TestSendRawTransactionConditionalDisabled(t *testing.T) {
+	svc := setupSvc(t)
+	svc.cfg.SendRawTransactionConditionalEnabled = false
+	hash, err := svc.SendRawTransactionConditional(context.Background(), nil, types.TransactionConditional{})
+	require.Zero(t, hash)
+	require.Equal(t, endpointDisabledErr, err)
+}
+
+func TestSendRawTransactionConditionalMissingAuth(t *testing.T) {
+	svc := setupSvc(t)
+	hash, err := svc.SendRawTransactionConditional(context.Background(), nil, types.TransactionConditional{})
+	require.Zero(t, hash)
+	require.Equal(t, missingAuthenticationErr, err)
+}
+
+func TestSendRawTransactionConditionalInvalidTxTarget(t *testing.T) {
+	svc := setupSvc(t)
+
+	txBytes, err := rlp.EncodeToBytes(types.NewTransaction(0, common.Address{19: 1}, big.NewInt(0), 0, big.NewInt(0), nil))
+	require.NoError(t, err)
+
+	// setup auth
+	ctx := context.WithValue(context.Background(), authContextKey{}, &AuthContext{Caller: common.HexToAddress("0xa")})
+	hash, err := svc.SendRawTransactionConditional(ctx, txBytes, types.TransactionConditional{})
+	require.Zero(t, hash)
+	require.Equal(t, entrypointSupportErr, err)
+}
+
+func TestSendRawTransactionConditionals(t *testing.T) {
+	costExcessiveCond := types.TransactionConditional{KnownAccounts: make(types.KnownAccounts)}
+	for i := 0; i < (params.TransactionConditionalMaxCost + 1); i++ {
+		iBig := big.NewInt(int64(i))
+		root := common.BigToHash(iBig)
+		costExcessiveCond.KnownAccounts[common.BigToAddress(iBig)] = types.KnownAccount{StorageRoot: &root}
+	}
+
+	uint64Ptr := func(num uint64) *uint64 { return &num }
+	tests := []struct {
+		name     string
+		cond     types.TransactionConditional
+		mustFail bool
+	}{
+
+		{
+			name:     "passes",
+			cond:     types.TransactionConditional{BlockNumberMin: big.NewInt(1), BlockNumberMax: big.NewInt(2), TimestampMin: uint64Ptr(1), TimestampMax: uint64Ptr(2)},
+			mustFail: false,
+		},
+		{
+			name:     "validation. block min greater than max",
+			cond:     types.TransactionConditional{BlockNumberMin: big.NewInt(2), BlockNumberMax: big.NewInt(1)},
+			mustFail: true,
+		},
+		{
+			name:     "validation. timestamp min greater than max",
+			cond:     types.TransactionConditional{TimestampMin: uint64Ptr(2), TimestampMax: uint64Ptr(1)},
+			mustFail: true,
+		},
+		{
+			name:     "excessive cost",
+			cond:     costExcessiveCond,
+			mustFail: true,
+		},
+	}
+
+	svc := setupSvc(t)
+	txBytes, err := rlp.EncodeToBytes(types.NewTransaction(0, predeploys.EntryPoint_v060Addr, big.NewInt(0), 0, big.NewInt(0), nil))
+	require.NoError(t, err)
+
+	for _, test := range tests {
+		ctx := context.Background()
+		if !test.mustFail {
+			ctx = context.WithValue(ctx, authContextKey{}, &AuthContext{Caller: common.HexToAddress("0xa")})
+		}
+
+		_, err := svc.SendRawTransactionConditional(ctx, txBytes, test.cond)
+		if test.mustFail && err == nil {
+			t.Errorf("Test %s should fail", test.name)
+		}
+		if !test.mustFail && err != nil {
+			t.Errorf("Test %s should pass but got err: %v", test.name, err)
+		}
+	}
+}

op-txproxy/go.mod

@@ -0,0 +1,92 @@
+module github.com/ethereum-optimism/infra/op-txproxy
+
+go 1.21
+
+require (
+	github.com/ethereum-optimism/optimism v1.9.1-0.20240827163921-45e129c8ca4b
+	github.com/ethereum/go-ethereum v1.14.8
+	github.com/prometheus/client_golang v1.20.2
+	github.com/stretchr/testify v1.9.0
+	github.com/urfave/cli/v2 v2.27.4
+	golang.org/x/time v0.6.0
+)
+
+require (
+	github.com/BurntSushi/toml v1.4.0 // indirect
+	github.com/DataDog/zstd v1.5.6-0.20230824185856-869dae002e5e // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/bits-and-blooms/bitset v1.10.0 // indirect
+	github.com/btcsuite/btcd/btcec/v2 v2.3.4 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/cockroachdb/errors v1.11.3 // indirect
+	github.com/cockroachdb/fifo v0.0.0-20240606204812-0bbfbd93a7ce // indirect
+	github.com/cockroachdb/logtags v0.0.0-20230118201751-21c54148d20b // indirect
+	github.com/cockroachdb/pebble v1.1.2 // indirect
+	github.com/cockroachdb/redact v1.1.5 // indirect
+	github.com/cockroachdb/tokenbucket v0.0.0-20230807174530-cc333fc44b06 // indirect
+	github.com/consensys/bavard v0.1.13 // indirect
+	github.com/consensys/gnark-crypto v0.12.1 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.4 // indirect
+	github.com/crate-crypto/go-ipa v0.0.0-20240223125850-b1e8a79f509c // indirect
+	github.com/crate-crypto/go-kzg-4844 v1.0.0 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/deckarep/golang-set/v2 v2.6.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.3.0 // indirect
+	github.com/ethereum-optimism/superchain-registry/superchain v0.0.0-20240828144951-4e6edcb7d36c // indirect
+	github.com/ethereum/c-kzg-4844 v1.0.0 // indirect
+	github.com/ethereum/go-verkle v0.1.1-0.20240306133620-7d920df305f0 // indirect
+	github.com/getsentry/sentry-go v0.27.0 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
+	github.com/gofrs/flock v0.8.1 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang-jwt/jwt/v4 v4.5.0 // indirect
+	github.com/golang/snappy v0.0.5-0.20220116011046-fa5810519dcb // indirect
+	github.com/gorilla/websocket v1.5.3 // indirect
+	github.com/hashicorp/go-bexpr v0.1.11 // indirect
+	github.com/holiman/uint256 v1.3.1 // indirect
+	github.com/huin/goupnp v1.3.0 // indirect
+	github.com/jackpal/go-nat-pmp v1.0.2 // indirect
+	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-runewidth v0.0.14 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/mitchellh/pointerstructure v1.2.1 // indirect
+	github.com/mmcloughlin/addchain v0.4.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/olekukonko/tablewriter v0.0.5 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.55.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	github.com/rivo/uniseg v0.4.4 // indirect
+	github.com/rogpeppe/go-internal v1.10.0 // indirect
+	github.com/rs/cors v1.11.0 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/shirou/gopsutil v3.21.11+incompatible // indirect
+	github.com/supranational/blst v0.3.11 // indirect
+	github.com/syndtr/goleveldb v1.0.1-0.20220614013038-64ee5596c38a // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
+	github.com/xrash/smetrics v0.0.0-20240521201337-686a1a2994c1 // indirect
+	github.com/yusufpapurcu/wmi v1.2.3 // indirect
+	golang.org/x/crypto v0.26.0 // indirect
+	golang.org/x/exp v0.0.0-20240808152545-0cdaa3abc0fa // indirect
+	golang.org/x/mod v0.20.0 // indirect
+	golang.org/x/sync v0.8.0 // indirect
+	golang.org/x/sys v0.24.0 // indirect
+	golang.org/x/term v0.23.0 // indirect
+	golang.org/x/text v0.17.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
+	gopkg.in/natefinch/lumberjack.v2 v2.2.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	rsc.io/tmplfunc v0.0.3 // indirect
+)
+
+replace github.com/ethereum/go-ethereum => github.com/ethereum-optimism/op-geth v1.101408.1-dev.1
+
+//replace github.com/ethereum/go-ethereum => ../../op-geth

op-txproxy/go.sum

@@ -0,0 +1,334 @@
+github.com/BurntSushi/toml v1.4.0 h1:kuoIxZQy2WRRk1pttg9asf+WVv6tWQuBNVmK8+nqPr0=
+github.com/BurntSushi/toml v1.4.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
+github.com/DataDog/zstd v1.5.6-0.20230824185856-869dae002e5e h1:ZIWapoIRN1VqT8GR8jAwb1Ie9GyehWjVcGh32Y2MznE=
+github.com/DataDog/zstd v1.5.6-0.20230824185856-869dae002e5e/go.mod h1:g4AWEaM3yOg3HYfnJ3YIawPnVdXJh9QME85blwSAmyw=
+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
+github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
+github.com/VictoriaMetrics/fastcache v1.12.2 h1:N0y9ASrJ0F6h0QaC3o6uJb3NIZ9VKLjCM7NQbSmF7WI=
+github.com/VictoriaMetrics/fastcache v1.12.2/go.mod h1:AmC+Nzz1+3G2eCPapF6UcsnkThDcMsQicp4xDukwJYI=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/bits-and-blooms/bitset v1.10.0 h1:ePXTeiPEazB5+opbv5fr8umg2R/1NlzgDsyepwsSr88=
+github.com/bits-and-blooms/bitset v1.10.0/go.mod h1:7hO7Gc7Pp1vODcmWvKMRA9BNmbv6a/7QIWpPxHddWR8=
+github.com/btcsuite/btcd v0.24.2 h1:aLmxPguqxza+4ag8R1I2nnJjSu2iFn/kqtHTIImswcY=
+github.com/btcsuite/btcd/btcec/v2 v2.3.4 h1:3EJjcN70HCu/mwqlUsGK8GcNVyLVxFDlWurTXGPFfiQ=
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+github.com/btcsuite/btcd/chaincfg/chainhash v1.1.0 h1:59Kx4K6lzOW5w6nFlA0v5+lk/6sjybR934QNHSJZPTQ=
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+github.com/fsnotify/fsnotify v1.5.4/go.mod h1:OVB6XrOHzAwXMpEM7uPOzcehqUV2UqJxmVXmkdnm1bU=
+github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
+github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
+github.com/gballet/go-libpcsclite v0.0.0-20191108122812-4678299bea08 h1:f6D9Hr8xV8uYKlyuj8XIruxlh9WjVjdh1gIicAS7ays=
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op-txproxy/txproxy.go

@@ -0,0 +1,32 @@
+package op_txproxy
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/ethereum-optimism/optimism/op-service/metrics"
+
+	"github.com/ethereum/go-ethereum/log"
+	gethrpc "github.com/ethereum/go-ethereum/rpc"
+)
+
+var (
+	MetricsNameSpace = "op_txproxy"
+)
+
+type TxProxy struct {
+	conditionalTxService *ConditionalTxService
+}
+
+func NewTxProxy(ctx context.Context, log log.Logger, m metrics.Factory, cfg *CLIConfig) (*TxProxy, error) {
+	conditionalTxService, err := NewConditionalTxService(ctx, log, m, cfg)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create conditional tx service: %w", err)
+	}
+
+	return &TxProxy{conditionalTxService}, nil
+}
+
+func (txp *TxProxy) GetAPIs() []gethrpc.API {
+	return []gethrpc.API{{Namespace: "eth", Service: txp.conditionalTxService}}
+}

ops/tag-service/tag-service.py

@@ -11,6 +11,7 @@ import semver
 # Minimum version numbers for packages migrating from legacy versioning.
 MIN_VERSIONS = {
     'proxyd': '4.6.1',
+    'op-signer': '0.0.1',
 }
 
 VALID_BUMPS = ('major', 'minor', 'patch', 'prerelease', 'finalize-prerelease')

ops/tag-service/tag-tool.py

@@ -6,7 +6,9 @@ import semver
 SERVICES  = [
     'proxyd',
     'op-ufm',
+    'op-signer',
     'op-conductor-mon',
+    'op-txproxy',
 ]
 VERSION_PATTERN = '^{service}/v\\d+\\.\\d+\\.\\d+(-rc\\.\\d+)?$'
 GIT_TAG_COMMAND = 'git tag -a {tag} -m "{message}"'

proxyd/backend.go

@@ -17,7 +17,7 @@ import (
 	"sync"
 	"time"
 
-	sw "github.com/ethereum-optimism/optimism/proxyd/pkg/avg-sliding-window"
+	sw "github.com/ethereum-optimism/infra/proxyd/pkg/avg-sliding-window"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/rpc"
@@ -56,7 +56,7 @@ var (
 	}
 	ErrNoBackends = &RPCErr{
 		Code:          JSONRPCErrorInternal - 11,
-		Message:       "no backends available for method",
+		Message:       "no backend is currently healthy to serve traffic",
 		HTTPErrorCode: 503,
 	}
 	ErrBackendOverCapacity = &RPCErr{

proxyd/cache.go

@@ -45,13 +45,14 @@ func (c *cache) Put(ctx context.Context, key string, value string) error {
 }
 
 type redisCache struct {
-	rdb    *redis.Client
+	redisClient     *redis.Client
-	prefix string
+	redisReadClient *redis.Client
-	ttl    time.Duration
+	prefix          string
+	ttl             time.Duration
 }
 
-func newRedisCache(rdb *redis.Client, prefix string, ttl time.Duration) *redisCache {
+func newRedisCache(redisClient *redis.Client, redisReadClient *redis.Client, prefix string, ttl time.Duration) *redisCache {
-	return &redisCache{rdb, prefix, ttl}
+	return &redisCache{redisClient, redisReadClient, prefix, ttl}
 }
 
 func (c *redisCache) namespaced(key string) string {
@@ -63,7 +64,7 @@ func (c *redisCache) namespaced(key string) string {
 
 func (c *redisCache) Get(ctx context.Context, key string) (string, error) {
 	start := time.Now()
-	val, err := c.rdb.Get(ctx, c.namespaced(key)).Result()
+	val, err := c.redisReadClient.Get(ctx, c.namespaced(key)).Result()
 	redisCacheDurationSumm.WithLabelValues("GET").Observe(float64(time.Since(start).Milliseconds()))
 
 	if err == redis.Nil {
@@ -77,7 +78,7 @@ func (c *redisCache) Get(ctx context.Context, key string) (string, error) {
 
 func (c *redisCache) Put(ctx context.Context, key string, value string) error {
 	start := time.Now()
-	err := c.rdb.SetEx(ctx, c.namespaced(key), value, c.ttl).Err()
+	err := c.redisClient.SetEx(ctx, c.namespaced(key), value, c.ttl).Err()
 	redisCacheDurationSumm.WithLabelValues("SETEX").Observe(float64(time.Since(start).Milliseconds()))
 
 	if err != nil {

proxyd/cmd/proxyd/main.go

@@ -16,7 +16,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/log"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 )
 
 var (

proxyd/config.go

@@ -43,6 +43,7 @@ type CacheConfig struct {
 type RedisConfig struct {
 	URL       string `toml:"url"`
 	Namespace string `toml:"namespace"`
+	ReadURL   string `toml:"read_url"`
 }
 
 type MetricsConfig struct {

proxyd/go.mod

@@ -1,4 +1,4 @@
-module github.com/ethereum-optimism/optimism/proxyd
+module github.com/ethereum-optimism/infra/proxyd
 
 go 1.21
 
@@ -15,7 +15,7 @@ require (
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.17.0
 	github.com/redis/go-redis/v9 v9.2.1
-	github.com/rs/cors v1.10.1
+	github.com/rs/cors v1.11.0
 	github.com/stretchr/testify v1.8.4
 	github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7
 	github.com/xaionaro-go/weightedshuffle v0.0.0-20211213010739-6a74fbc7d24a

proxyd/go.sum

@@ -179,8 +179,8 @@ github.com/rivo/uniseg v0.4.4/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUc
 github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
 github.com/rogpeppe/go-internal v1.11.0 h1:cWPaGQEPrBb5/AsnsZesgZZ9yb1OQ+GOISoDNXVBh4M=
 github.com/rogpeppe/go-internal v1.11.0/go.mod h1:ddIwULY96R17DhadqLgMfk9H9tvdUzkipdSkR5nkCZA=
-github.com/rs/cors v1.10.1 h1:L0uuZVXIKlI1SShY2nhFfo44TYvDPQ1w4oFkUJNfhyo=
+github.com/rs/cors v1.11.0 h1:0B9GE/r9Bc2UxRMMtymBkHTenPkHDv0CW4Y98GBY+po=
-github.com/rs/cors v1.10.1/go.mod h1:XyqrcTp5zjWr1wsJ8PIRZssZ8b/WMcMf71DJnit4EMU=
+github.com/rs/cors v1.11.0/go.mod h1:XyqrcTp5zjWr1wsJ8PIRZssZ8b/WMcMf71DJnit4EMU=
 github.com/shirou/gopsutil v3.21.11+incompatible h1:+1+c1VGhc88SSonWP6foOcLhvnKlUeu/erjjvaPEYiI=
 github.com/shirou/gopsutil v3.21.11+incompatible/go.mod h1:5b4v6he4MtMOwMlS0TUMTu2PcXUg8+E1lC7eC3UO/RA=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=

proxyd/integration_tests/batch_timeout_test.go

@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 	"github.com/stretchr/testify/require"
 )
 

proxyd/integration_tests/batching_test.go

@@ -5,7 +5,7 @@ import (
 	"os"
 	"testing"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 	"github.com/stretchr/testify/require"
 )
 
@@ -66,8 +66,8 @@ func TestBatching(t *testing.T) {
 				NewRPCReq("2", "eth_chainId", nil),
 			},
 			expectedRes: asArray(
-				`{"error":{"code":-32011,"message":"no backends available for method"},"id":1,"jsonrpc":"2.0"}`,
+				`{"error":{"code":-32011,"message":"no backend is currently healthy to serve traffic"},"id":1,"jsonrpc":"2.0"}`,
-				`{"error":{"code":-32011,"message":"no backends available for method"},"id":2,"jsonrpc":"2.0"}`,
+				`{"error":{"code":-32011,"message":"no backend is currently healthy to serve traffic"},"id":2,"jsonrpc":"2.0"}`,
 			),
 			maxUpstreamBatchSize: 10,
 			numExpectedForwards:  1,
@@ -80,8 +80,8 @@ func TestBatching(t *testing.T) {
 				NewRPCReq("2", "eth_chainId", nil),
 			},
 			expectedRes: asArray(
-				`{"error":{"code":-32011,"message":"no backends available for method"},"id":1,"jsonrpc":"2.0"}`,
+				`{"error":{"code":-32011,"message":"no backend is currently healthy to serve traffic"},"id":1,"jsonrpc":"2.0"}`,
-				`{"error":{"code":-32011,"message":"no backends available for method"},"id":2,"jsonrpc":"2.0"}`,
+				`{"error":{"code":-32011,"message":"no backend is currently healthy to serve traffic"},"id":2,"jsonrpc":"2.0"}`,
 			),
 			maxUpstreamBatchSize: 1,
 			numExpectedForwards:  2,

proxyd/integration_tests/block_height_zero_and_network_errors_test.go

@@ -9,9 +9,9 @@ import (
 
 	"time"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
-	sw "github.com/ethereum-optimism/optimism/proxyd/pkg/avg-sliding-window"
+	sw "github.com/ethereum-optimism/infra/proxyd/pkg/avg-sliding-window"
-	ms "github.com/ethereum-optimism/optimism/proxyd/tools/mockserver/handler"
+	ms "github.com/ethereum-optimism/infra/proxyd/tools/mockserver/handler"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/stretchr/testify/require"
 )

proxyd/integration_tests/caching_test.go

@@ -8,7 +8,7 @@ import (
 	"time"
 
 	"github.com/alicebob/miniredis"
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 	"github.com/stretchr/testify/require"
 )
 
@@ -264,6 +264,63 @@ func TestBatchCaching(t *testing.T) {
 	require.Equal(t, 1, countRequests(backend, "eth_call"))
 }
 
+func TestCachingWithReadReplica(t *testing.T) {
+	primary, err := miniredis.Run()
+	require.NoError(t, err)
+	defer primary.Close()
+
+	replica, err := miniredis.Run()
+	require.NoError(t, err)
+	defer replica.Close()
+
+	hdlr := NewBatchRPCResponseRouter()
+	hdlr.SetRoute("eth_getBlockByHash", "999", "eth_getBlockByHash")
+
+	backend := NewMockBackend(hdlr)
+	defer backend.Close()
+
+	require.NoError(t, os.Setenv("GOOD_BACKEND_RPC_URL", backend.URL()))
+	require.NoError(t, os.Setenv("REDIS_URL", fmt.Sprintf("redis://%s", primary.Addr())))
+	require.NoError(t, os.Setenv("REDIS_READ_URL", fmt.Sprintf("redis://%s", replica.Addr())))
+
+	config := ReadConfig("caching_replica")
+	client := NewProxydClient("http://127.0.0.1:8545")
+	_, shutdown, err := proxyd.Start(config)
+	require.NoError(t, err)
+	defer shutdown()
+
+	// allow time for the block number fetcher to fire
+	time.Sleep(1500 * time.Millisecond)
+
+	params := []interface{}{"0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b", "false"}
+	response := "{\"jsonrpc\": \"2.0\", \"result\": \"eth_getBlockByHash\", \"id\": 999}"
+	resRaw, _, err := client.SendRPC("eth_getBlockByHash", params)
+	require.NoError(t, err)
+
+	// because the cache is not replicated to the replica, count request must be increased
+	resCache, _, err := client.SendRPC("eth_getBlockByHash", params)
+	require.NoError(t, err)
+	RequireEqualJSON(t, []byte(response), resCache)
+	RequireEqualJSON(t, resRaw, resCache)
+	require.Equal(t, 2, countRequests(backend, "eth_getBlockByHash"))
+
+	// replicate cache data
+	for _, key := range primary.Keys() {
+		value, err := primary.Get(key)
+		require.NoError(t, err)
+
+		err = replica.Set(key, value)
+		require.NoError(t, err)
+	}
+
+	// now cache hit. count request must be same
+	resCache, _, err = client.SendRPC("eth_getBlockByHash", params)
+	require.NoError(t, err)
+	RequireEqualJSON(t, []byte(response), resCache)
+	RequireEqualJSON(t, resRaw, resCache)
+	require.Equal(t, 2, countRequests(backend, "eth_getBlockByHash"))
+}
+
 func countRequests(backend *MockBackend, name string) int {
 	var count int
 	for _, req := range backend.Requests() {

proxyd/integration_tests/consensus_test.go

@@ -12,8 +12,8 @@ import (
 
 	"github.com/ethereum/go-ethereum/common/hexutil"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
-	ms "github.com/ethereum-optimism/optimism/proxyd/tools/mockserver/handler"
+	ms "github.com/ethereum-optimism/infra/proxyd/tools/mockserver/handler"
 	"github.com/stretchr/testify/require"
 )
 

proxyd/integration_tests/failover_test.go

@@ -9,13 +9,13 @@ import (
 	"time"
 
 	"github.com/alicebob/miniredis"
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 	"github.com/stretchr/testify/require"
 )
 
 const (
 	goodResponse       = `{"jsonrpc": "2.0", "result": "hello", "id": 999}`
-	noBackendsResponse = `{"error":{"code":-32011,"message":"no backends available for method"},"id":999,"jsonrpc":"2.0"}`
+	noBackendsResponse = `{"error":{"code":-32011,"message":"no backend is currently healthy to serve traffic"},"id":999,"jsonrpc":"2.0"}`
 	unexpectedResponse = `{"error":{"code":-32011,"message":"some error"},"id":999,"jsonrpc":"2.0"}`
 )
 
@@ -110,7 +110,7 @@ func TestFailover(t *testing.T) {
 		}))
 		res, statusCode, _ := client.SendRPC("eth_chainId", nil)
 		require.Equal(t, 503, statusCode)
-		RequireEqualJSON(t, []byte(noBackendsResponse), res) // return no backend available since both failed
+		RequireEqualJSON(t, []byte(noBackendsResponse), res) // return currently not healthy since both failed
 		require.Equal(t, 1, len(goodBackend.Requests()))
 		require.Equal(t, 1, len(badBackend.Requests())) // bad backend is still called
 		goodBackend.Reset()

proxyd/integration_tests/fallback_test.go

@@ -11,8 +11,8 @@ import (
 
 	"github.com/ethereum/go-ethereum/common/hexutil"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
-	ms "github.com/ethereum-optimism/optimism/proxyd/tools/mockserver/handler"
+	ms "github.com/ethereum-optimism/infra/proxyd/tools/mockserver/handler"
 	"github.com/stretchr/testify/require"
 )
 

proxyd/integration_tests/max_rpc_conns_test.go

@@ -8,7 +8,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 	"github.com/stretchr/testify/require"
 )
 

proxyd/integration_tests/mock_backend_test.go

@@ -10,7 +10,7 @@ import (
 	"strings"
 	"sync"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 	"github.com/gorilla/websocket"
 )
 

proxyd/integration_tests/multicall_test.go

@@ -3,7 +3,6 @@ package integration_tests
 import (
 	"bytes"
 	"encoding/json"
-	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -12,8 +11,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
-	ms "github.com/ethereum-optimism/optimism/proxyd/tools/mockserver/handler"
+	ms "github.com/ethereum-optimism/infra/proxyd/tools/mockserver/handler"
 	"github.com/stretchr/testify/require"
 )
 
@@ -58,7 +57,6 @@ func setupMulticall(t *testing.T) (map[string]nodeContext, *proxyd.BackendGroup,
 
 	// setup proxyd
 	config := ReadConfig("multicall")
-	fmt.Printf("[SetupMulticall] Using Timeout of %d \n", config.Server.TimeoutSeconds)
 	svr, shutdown, err := proxyd.Start(config)
 	require.NoError(t, err)
 
@@ -93,6 +91,7 @@ func setupMulticall(t *testing.T) (map[string]nodeContext, *proxyd.BackendGroup,
 
 	handlers := []*ms.MockedHandler{&h1, &h2, &h3}
 
+	// Default Handler configurations
 	nodes["node1"].mockBackend.SetHandler(SingleResponseHandler(200, txAccepted))
 	nodes["node2"].mockBackend.SetHandler(http.HandlerFunc(handlers[1].Handler))
 	//Node 3 has no handler empty handler never respondes should always context timeout
@@ -194,16 +193,30 @@ func TestMulticall(t *testing.T) {
 		defer nodes["node3"].mockBackend.Close()
 		defer shutdown()
 
-		nodes["node1"].mockBackend.SetHandler(SingleResponseHandlerWithSleep(200, txAccepted, 3*time.Second))
+		triggerBackend1 := make(chan struct{})
-		nodes["node2"].mockBackend.SetHandler(SingleResponseHandler(200, txAccepted))
+		triggerBackend2 := make(chan struct{})
+		triggerBackend3 := make(chan struct{})
+
+		nodes["node1"].mockBackend.SetHandler(TriggerResponseHandler(200, txAccepted, triggerBackend1))
+		nodes["node2"].mockBackend.SetHandler(TriggerResponseHandler(200, txAccepted, triggerBackend2))
+		nodes["node3"].mockBackend.SetHandler(TriggerResponseHandler(200, txAccepted, triggerBackend3))
 
 		localSvr := setServerBackend(svr, nodes)
-
 		body := makeSendRawTransaction(txHex1)
 		req, _ := http.NewRequest("POST", "https://1.1.1.1:8080", bytes.NewReader(body))
 		req.Header.Set("X-Forwarded-For", "203.0.113.1")
 		rr := httptest.NewRecorder()
 
+		var wg sync.WaitGroup
+		wg.Add(1)
+		go func() {
+			triggerBackend2 <- struct{}{}
+			time.Sleep(2 * time.Second)
+			triggerBackend1 <- struct{}{}
+			triggerBackend3 <- struct{}{}
+			wg.Done()
+		}()
+
 		localSvr.HandleRPC(rr, req)
 
 		resp := rr.Result()
@@ -219,6 +232,7 @@ func TestMulticall(t *testing.T) {
 		require.Equal(t, resp.Header["X-Served-By"], []string{"node/node2"})
 		require.False(t, rpcRes.IsError())
 
+		wg.Wait()
 		require.Equal(t, 1, nodeBackendRequestCount(nodes, "node1"))
 		require.Equal(t, 1, nodeBackendRequestCount(nodes, "node2"))
 		require.Equal(t, 1, nodeBackendRequestCount(nodes, "node3"))
@@ -232,21 +246,13 @@ func TestMulticall(t *testing.T) {
 
 		defer shutdown()
 
-		shutdownChan1 := make(chan struct{})
+		triggerBackend1 := make(chan struct{})
-		shutdownChan2 := make(chan struct{})
+		triggerBackend2 := make(chan struct{})
 
-		nodes["node1"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(200, nonceErrorResponse, shutdownChan1, 4*time.Second))
+		nodes["node1"].mockBackend.SetHandler(TriggerResponseHandler(200, nonceErrorResponse, triggerBackend1))
-		nodes["node2"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(200, nonceErrorResponse, shutdownChan2, 1*time.Second))
+		nodes["node2"].mockBackend.SetHandler(TriggerResponseHandler(200, nonceErrorResponse, triggerBackend2))
 		nodes["node3"].mockBackend.SetHandler(SingleResponseHandler(403, dummyRes))
 
-		var wg sync.WaitGroup
-		wg.Add(1)
-		go func() {
-			shutdownChan2 <- struct{}{}
-			shutdownChan1 <- struct{}{}
-			wg.Done()
-		}()
-
 		localSvr := setServerBackend(svr, nodes)
 
 		body := makeSendRawTransaction(txHex1)
@@ -254,6 +260,15 @@ func TestMulticall(t *testing.T) {
 		req.Header.Set("X-Forwarded-For", "203.0.113.1")
 		rr := httptest.NewRecorder()
 
+		var wg sync.WaitGroup
+		wg.Add(1)
+		go func() {
+			triggerBackend2 <- struct{}{}
+			time.Sleep(3 * time.Second)
+			triggerBackend1 <- struct{}{}
+			wg.Done()
+		}()
+
 		localSvr.HandleRPC(rr, req)
 
 		resp := rr.Result()
@@ -281,8 +296,10 @@ func TestMulticall(t *testing.T) {
 		defer nodes["node3"].mockBackend.Close()
 		defer shutdown()
 
+		triggerBackend1 := make(chan struct{})
+
 		// We should ignore node2 first response cause 429, and return node 1 because 200
-		nodes["node1"].mockBackend.SetHandler(SingleResponseHandlerWithSleep(200, txAccepted, 3*time.Second))
+		nodes["node1"].mockBackend.SetHandler(TriggerResponseHandler(200, txAccepted, triggerBackend1))
 		nodes["node2"].mockBackend.SetHandler(SingleResponseHandler(429, txAccepted))
 
 		localSvr := setServerBackend(svr, nodes)
@@ -292,6 +309,14 @@ func TestMulticall(t *testing.T) {
 		req.Header.Set("X-Forwarded-For", "203.0.113.1")
 		rr := httptest.NewRecorder()
 
+		var wg sync.WaitGroup
+		wg.Add(1)
+		go func() {
+			time.Sleep(2 * time.Second)
+			triggerBackend1 <- struct{}{}
+			wg.Done()
+		}()
+
 		localSvr.HandleRPC(rr, req)
 
 		resp := rr.Result()
@@ -305,6 +330,7 @@ func TestMulticall(t *testing.T) {
 		require.Equal(t, "2.0", rpcRes.JSONRPC)
 
 		require.Equal(t, resp.Header["X-Served-By"], []string{"node/node1"})
+		wg.Wait()
 		require.Equal(t, 1, nodeBackendRequestCount(nodes, "node1"))
 		require.Equal(t, 1, nodeBackendRequestCount(nodes, "node2"))
 		require.Equal(t, 1, nodeBackendRequestCount(nodes, "node3"))
@@ -317,9 +343,9 @@ func TestMulticall(t *testing.T) {
 		defer nodes["node3"].mockBackend.Close()
 		defer shutdown()
 
-		shutdownChan := make(chan struct{})
+		triggerBackend := make(chan struct{})
 		nodes["node1"].mockBackend.SetHandler(SingleResponseHandler(200, dummyRes))
-		nodes["node2"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(200, dummyRes, shutdownChan, 7*time.Second))
+		nodes["node2"].mockBackend.SetHandler(TriggerResponseHandler(200, dummyRes, triggerBackend))
 
 		localSvr := setServerBackend(svr, nodes)
 
@@ -329,8 +355,14 @@ func TestMulticall(t *testing.T) {
 		rr := httptest.NewRecorder()
 
 		localSvr.HandleRPC(rr, req)
+		var wg sync.WaitGroup
+		wg.Add(1)
+		go func() {
+			time.Sleep(7 * time.Second)
+			triggerBackend <- struct{}{}
+			wg.Done()
+		}()
 		resp := rr.Result()
-		shutdownChan <- struct{}{}
 		defer resp.Body.Close()
 
 		require.NotNil(t, resp.Body)
@@ -342,6 +374,7 @@ func TestMulticall(t *testing.T) {
 		require.NoError(t, json.NewDecoder(resp.Body).Decode(rpcRes))
 		require.False(t, rpcRes.IsError())
 
+		wg.Wait()
 		require.Equal(t, 1, nodeBackendRequestCount(nodes, "node1"))
 		require.Equal(t, 1, nodeBackendRequestCount(nodes, "node2"))
 		require.Equal(t, 1, nodeBackendRequestCount(nodes, "node3"))
@@ -355,10 +388,10 @@ func TestMulticall(t *testing.T) {
 		defer nodes["node3"].mockBackend.Close()
 		defer shutdown()
 
-		shutdownChan1 := make(chan struct{})
+		triggerBackend1 := make(chan struct{})
-		shutdownChan2 := make(chan struct{})
+		triggerBackend2 := make(chan struct{})
-		nodes["node1"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(200, dummyRes, shutdownChan1, 7*time.Second))
+		nodes["node1"].mockBackend.SetHandler(TriggerResponseHandler(200, dummyRes, triggerBackend1))
-		nodes["node2"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(200, dummyRes, shutdownChan2, 7*time.Second))
+		nodes["node2"].mockBackend.SetHandler(TriggerResponseHandler(200, dummyRes, triggerBackend2))
 
 		localSvr := setServerBackend(svr, nodes)
 
@@ -370,12 +403,12 @@ func TestMulticall(t *testing.T) {
 		var wg sync.WaitGroup
 		wg.Add(1)
 		go func() {
-			shutdownChan1 <- struct{}{}
+			time.Sleep(7 * time.Second)
-			shutdownChan2 <- struct{}{}
+			triggerBackend1 <- struct{}{}
+			triggerBackend2 <- struct{}{}
 			wg.Done()
 		}()
 
-		fmt.Println("sending request")
 		localSvr.HandleRPC(rr, req)
 
 		resp := rr.Result()
@@ -388,7 +421,6 @@ func TestMulticall(t *testing.T) {
 		require.True(t, rpcRes.IsError())
 		require.Equal(t, rpcRes.Error.Code, proxyd.ErrNoBackends.Code)
 
-		// Wait for test response to complete before checking query count
 		wg.Wait()
 		require.Equal(t, 1, nodeBackendRequestCount(nodes, "node1"))
 		require.Equal(t, 1, nodeBackendRequestCount(nodes, "node2"))
@@ -403,24 +435,24 @@ func TestMulticall(t *testing.T) {
 		defer shutdown()
 
 		for i := 1; i < 4; i++ {
-			shutdownChan1 := make(chan struct{})
+			triggerBackend1 := make(chan struct{})
-			shutdownChan2 := make(chan struct{})
+			triggerBackend2 := make(chan struct{})
-			shutdownChan3 := make(chan struct{})
+			triggerBackend3 := make(chan struct{})
 
 			switch {
 			case i == 1:
-				nodes["node1"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(200, txAccepted, shutdownChan1, 1*time.Second))
+				nodes["node1"].mockBackend.SetHandler(TriggerResponseHandler(200, txAccepted, triggerBackend1))
-				nodes["node2"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(429, dummyRes, shutdownChan2, 1*time.Second))
+				nodes["node2"].mockBackend.SetHandler(TriggerResponseHandler(429, dummyRes, triggerBackend2))
-				nodes["node3"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(503, dummyRes, shutdownChan3, 1*time.Second))
+				nodes["node3"].mockBackend.SetHandler(TriggerResponseHandler(503, dummyRes, triggerBackend3))
 			case i == 2:
-				nodes["node1"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(404, dummyRes, shutdownChan1, 1*time.Second))
+				nodes["node1"].mockBackend.SetHandler(TriggerResponseHandler(404, dummyRes, triggerBackend1))
-				nodes["node2"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(200, nonceErrorResponse, shutdownChan2, 1*time.Second))
+				nodes["node2"].mockBackend.SetHandler(TriggerResponseHandler(200, nonceErrorResponse, triggerBackend2))
-				nodes["node3"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(405, dummyRes, shutdownChan3, 1*time.Second))
+				nodes["node3"].mockBackend.SetHandler(TriggerResponseHandler(405, dummyRes, triggerBackend3))
 			case i == 3:
 				// Return the quickest response
-				nodes["node1"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(404, dummyRes, shutdownChan1, 1*time.Second))
+				nodes["node1"].mockBackend.SetHandler(TriggerResponseHandler(404, dummyRes, triggerBackend1))
-				nodes["node2"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(500, dummyRes, shutdownChan2, 1*time.Second))
+				nodes["node2"].mockBackend.SetHandler(TriggerResponseHandler(500, dummyRes, triggerBackend2))
-				nodes["node3"].mockBackend.SetHandler(SingleResponseHandlerWithSleepShutdown(200, nonceErrorResponse, shutdownChan3, 1*time.Second))
+				nodes["node3"].mockBackend.SetHandler(TriggerResponseHandler(200, nonceErrorResponse, triggerBackend3))
 			}
 
 			localSvr := setServerBackend(svr, nodes)
@@ -433,9 +465,9 @@ func TestMulticall(t *testing.T) {
 			var wg sync.WaitGroup
 			wg.Add(1)
 			go func() {
-				shutdownChan1 <- struct{}{}
+				triggerBackend1 <- struct{}{}
-				shutdownChan2 <- struct{}{}
+				triggerBackend2 <- struct{}{}
-				shutdownChan3 <- struct{}{}
+				triggerBackend3 <- struct{}{}
 				wg.Done()
 			}()
 
@@ -475,25 +507,13 @@ func TestMulticall(t *testing.T) {
 			require.Equal(t, i, nodeBackendRequestCount(nodes, "node3"))
 		}
 	})
-
 }
 
-func SingleResponseHandlerWithSleep(code int, response string, duration time.Duration) http.HandlerFunc {
+// TriggerResponseHandler uses a channel to control when a backend returns
+// test cases can add an element to the triggerResponse channel to control the when a specific backend returns
+func TriggerResponseHandler(code int, response string, triggerResponse chan struct{}) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		fmt.Println("sleeping")
+		<-triggerResponse
-		time.Sleep(duration)
-		fmt.Println("Shutting down Single Response Handler")
-		w.WriteHeader(code)
-		_, _ = w.Write([]byte(response))
-	}
-}
-
-func SingleResponseHandlerWithSleepShutdown(code int, response string, shutdownServer chan struct{}, duration time.Duration) http.HandlerFunc {
-	return func(w http.ResponseWriter, r *http.Request) {
-		fmt.Println("sleeping")
-		time.Sleep(duration)
-		<-shutdownServer
-		fmt.Println("Shutting down Single Response Handler")
 		w.WriteHeader(code)
 		_, _ = w.Write([]byte(response))
 	}

proxyd/integration_tests/rate_limit_test.go

@@ -7,7 +7,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 	"github.com/stretchr/testify/require"
 )
 

proxyd/integration_tests/sender_rate_limit_test.go

@@ -9,7 +9,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 	"github.com/stretchr/testify/require"
 )
 

proxyd/integration_tests/smoke_test.go

@@ -7,7 +7,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/stretchr/testify/require"
 )

proxyd/integration_tests/testdata/caching_replica.toml

@@ -0,0 +1,37 @@
+[server]
+rpc_port = 8545
+
+[backend]
+response_timeout_seconds = 1
+
+[redis]
+url = "$REDIS_URL"
+read_url = "$REDIS_READ_URL"
+namespace = "proxyd"
+
+[cache]
+enabled = true
+
+[backends]
+[backends.good]
+rpc_url = "$GOOD_BACKEND_RPC_URL"
+ws_url = "$GOOD_BACKEND_RPC_URL"
+
+[backend_groups]
+[backend_groups.main]
+backends = ["good"]
+
+[rpc_method_mappings]
+eth_chainId = "main"
+net_version = "main"
+eth_getBlockByNumber = "main"
+eth_blockNumber = "main"
+eth_call = "main"
+eth_getBlockTransactionCountByHash = "main"
+eth_getUncleCountByBlockHash = "main"
+eth_getBlockByHash = "main"
+eth_getTransactionByHash = "main"
+eth_getTransactionByBlockHashAndIndex = "main"
+eth_getUncleByBlockHashAndIndex = "main"
+eth_getTransactionReceipt = "main"
+debug_getRawReceipts = "main"

proxyd/integration_tests/util_test.go

@@ -17,7 +17,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/log"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 )
 
 type ProxydHTTPClient struct {

proxyd/integration_tests/validation_test.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 	"github.com/stretchr/testify/require"
 )
 

proxyd/integration_tests/ws_test.go

@@ -7,7 +7,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 	"github.com/gorilla/websocket"
 	"github.com/stretchr/testify/require"
 )

proxyd/proxyd.go

@@ -39,6 +39,7 @@ func Start(config *Config) (*Server, func(), error) {
 		}
 	}
 
+	// redis primary client
 	var redisClient *redis.Client
 	if config.Redis.URL != "" {
 		rURL, err := ReadFromEnvOrConfig(config.Redis.URL)
@@ -51,6 +52,23 @@ func Start(config *Config) (*Server, func(), error) {
 		}
 	}
 
+	// redis read replica client
+	// if read endpoint is not set, use primary endpoint
+	var redisReadClient = redisClient
+	if config.Redis.ReadURL != "" {
+		if redisClient == nil {
+			return nil, nil, errors.New("must specify a Redis primary URL. only read endpoint is set")
+		}
+		rURL, err := ReadFromEnvOrConfig(config.Redis.ReadURL)
+		if err != nil {
+			return nil, nil, err
+		}
+		redisReadClient, err = NewRedisClient(rURL)
+		if err != nil {
+			return nil, nil, err
+		}
+	}
+
 	if redisClient == nil && config.RateLimit.UseRedis {
 		return nil, nil, errors.New("must specify a Redis URL if UseRedis is true in rate limit config")
 	}
@@ -276,7 +294,7 @@ func Start(config *Config) (*Server, func(), error) {
 			if config.Cache.TTL != 0 {
 				ttl = time.Duration(config.Cache.TTL)
 			}
-			cache = newRedisCache(redisClient, config.Redis.Namespace, ttl)
+			cache = newRedisCache(redisClient, redisReadClient, config.Redis.Namespace, ttl)
 		}
 		rpcCache = newRPCCache(newCacheWithCompression(cache))
 	}

proxyd/tools/mockserver/handler/handler.go

@@ -8,7 +8,7 @@ import (
 	"os"
 	"strings"
 
-	"github.com/ethereum-optimism/optimism/proxyd"
+	"github.com/ethereum-optimism/infra/proxyd"
 
 	"github.com/gorilla/mux"
 	"github.com/pkg/errors"

proxyd/tools/mockserver/main.go

@@ -6,7 +6,7 @@ import (
 	"path"
 	"strconv"
 
-	"github.com/ethereum-optimism/optimism/proxyd/tools/mockserver/handler"
+	"github.com/ethereum-optimism/infra/proxyd/tools/mockserver/handler"
 )
 
 func main() {