op-txproxy: external validating proxy for conditional transactions (#42)

* txpool svc

* change mod github path

* tag-tool

* codeowners

.circleci/config.yml

@@ -17,6 +17,7 @@ workflows:
           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

@@ -13,6 +13,9 @@ parameters:
   run-build-op-signer:
     type: boolean
     default: false
+  run-build-op-txproxy:
+    type: boolean
+    default: false
   run-build-op-ufm:
     type: boolean
     default: false
@@ -434,6 +437,22 @@ workflows:
           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 >>]

.github/CODEOWNERS

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

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=
+github.com/btcsuite/btcd/btcec/v2 v2.3.4/go.mod h1:zYzJ8etWJQIv1Ogk7OzpWjowwOdXY1W/17j2MW85J04=
+github.com/btcsuite/btcd/chaincfg/chainhash v1.1.0 h1:59Kx4K6lzOW5w6nFlA0v5+lk/6sjybR934QNHSJZPTQ=
+github.com/btcsuite/btcd/chaincfg/chainhash v1.1.0/go.mod h1:7SFka0XMvUgj3hfZtydOrQY2mwhPclbT2snogU7SQQc=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
+github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
+github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
+github.com/cockroachdb/datadriven v1.0.3-0.20230413201302-be42291fc80f h1:otljaYPt5hWxV3MUfO5dFPFiOXg9CyG5/kCfayTqsJ4=
+github.com/cockroachdb/datadriven v1.0.3-0.20230413201302-be42291fc80f/go.mod h1:a9RdTaap04u637JoCzcUoIcDmvwSUtcUFtT/C3kJlTU=
+github.com/cockroachdb/errors v1.11.3 h1:5bA+k2Y6r+oz/6Z/RFlNeVCesGARKuC6YymtcDrbC/I=
+github.com/cockroachdb/errors v1.11.3/go.mod h1:m4UIW4CDjx+R5cybPsNrRbreomiFqt8o1h1wUVazSd8=
+github.com/cockroachdb/fifo v0.0.0-20240606204812-0bbfbd93a7ce h1:giXvy4KSc/6g/esnpM7Geqxka4WSqI1SZc7sMJFd3y4=
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+github.com/cockroachdb/pebble v1.1.2 h1:CUh2IPtR4swHlEj48Rhfzw6l/d0qA31fItcIszQVIsA=
+github.com/cockroachdb/pebble v1.1.2/go.mod h1:4exszw1r40423ZsmkG/09AFEG83I0uDgfujJdbL6kYU=
+github.com/cockroachdb/redact v1.1.5 h1:u1PMllDkdFfPWaNGMyLD1+so+aq3uUItthCFqzwPJ30=
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+github.com/cockroachdb/tokenbucket v0.0.0-20230807174530-cc333fc44b06 h1:zuQyyAKVxetITBuuhv3BI9cMrmStnpT18zmgmTxunpo=
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+github.com/consensys/bavard v0.1.13 h1:oLhMLOFGTLdlda/kma4VOJazblc7IM5y5QPd2A/YjhQ=
+github.com/consensys/bavard v0.1.13/go.mod h1:9ItSMtA/dXMAiL7BG6bqW2m3NdSEObYWoH223nGHukI=
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+github.com/crate-crypto/go-kzg-4844 v1.0.0 h1:TsSgHwrkTKecKJ4kadtHi4b3xHW5dCFUDFnUp1TsawI=
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+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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+github.com/deckarep/golang-set/v2 v2.6.0 h1:XfcQbWM1LlMB8BsJ8N9vW5ehnnPVIw0je80NsVHagjM=
+github.com/deckarep/golang-set/v2 v2.6.0/go.mod h1:VAky9rY/yGXJOLEDv3OMci+7wtDpOF4IN+y82NBOac4=
+github.com/decred/dcrd/crypto/blake256 v1.0.1 h1:7PltbUIQB7u/FfZ39+DGa/ShuMyJ5ilcvdfma9wOH6Y=
+github.com/decred/dcrd/crypto/blake256 v1.0.1/go.mod h1:2OfgNZ5wDpcsFmHmCK5gZTPcCXqlm2ArzUIkw9czNJo=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.3.0 h1:rpfIENRNNilwHwZeG5+P150SMrnNEcHYvcCuK6dPZSg=
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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-tool.py

@@ -8,6 +8,7 @@ SERVICES  = [
     '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}"'