1396 lines
52 KiB
Rust
1396 lines
52 KiB
Rust
///! Load balanced communication with a group of web3 providers
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use super::blockchain::{ArcBlock, BlockHashesCache};
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use super::connection::Web3Connection;
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use super::request::{
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OpenRequestHandle, OpenRequestHandleMetrics, OpenRequestResult, RequestRevertHandler,
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};
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use super::synced_connections::ConsensusConnections;
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use crate::app::{flatten_handle, AnyhowJoinHandle};
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use crate::config::{BlockAndRpc, TxHashAndRpc, Web3ConnectionConfig};
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use crate::frontend::authorization::{Authorization, RequestMetadata};
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use crate::frontend::rpc_proxy_ws::ProxyMode;
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use crate::jsonrpc::{JsonRpcForwardedResponse, JsonRpcRequest};
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use crate::rpcs::transactions::TxStatus;
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use arc_swap::ArcSwap;
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use counter::Counter;
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use derive_more::From;
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use ethers::prelude::{ProviderError, TxHash, H256, U64};
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use futures::future::{join_all, try_join_all};
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use futures::stream::FuturesUnordered;
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use futures::StreamExt;
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use hashbrown::HashMap;
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use log::{debug, error, info, trace, warn, Level};
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use migration::sea_orm::DatabaseConnection;
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use moka::future::{Cache, ConcurrentCacheExt};
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use serde::ser::{SerializeStruct, Serializer};
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use serde::Serialize;
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use serde_json::json;
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use serde_json::value::RawValue;
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use std::collections::BTreeMap;
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use std::fmt;
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use std::sync::atomic::Ordering;
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use std::sync::Arc;
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use thread_fast_rng::rand::seq::SliceRandom;
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use tokio::sync::{broadcast, watch};
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use tokio::task;
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use tokio::time::{interval, sleep, sleep_until, Duration, Instant, MissedTickBehavior};
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/// A collection of web3 connections. Sends requests either the current best server or all servers.
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#[derive(From)]
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pub struct Web3Connections {
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pub(crate) conns: HashMap<String, Arc<Web3Connection>>,
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/// any requests will be forwarded to one (or more) of these connections
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pub(super) synced_connections: ArcSwap<ConsensusConnections>,
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pub(super) pending_transactions:
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Cache<TxHash, TxStatus, hashbrown::hash_map::DefaultHashBuilder>,
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/// TODO: this map is going to grow forever unless we do some sort of pruning. maybe store pruned in redis?
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/// all blocks, including orphans
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pub(super) block_hashes: BlockHashesCache,
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/// blocks on the heaviest chain
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pub(super) block_numbers: Cache<U64, H256, hashbrown::hash_map::DefaultHashBuilder>,
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pub(super) min_head_rpcs: usize,
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pub(super) min_sum_soft_limit: u32,
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}
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impl Web3Connections {
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/// Spawn durable connections to multiple Web3 providers.
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#[allow(clippy::too_many_arguments)]
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pub async fn spawn(
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chain_id: u64,
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db_conn: Option<DatabaseConnection>,
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server_configs: HashMap<String, Web3ConnectionConfig>,
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http_client: Option<reqwest::Client>,
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redis_pool: Option<redis_rate_limiter::RedisPool>,
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block_map: BlockHashesCache,
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head_block_sender: Option<watch::Sender<ArcBlock>>,
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min_sum_soft_limit: u32,
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min_head_rpcs: usize,
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pending_tx_sender: Option<broadcast::Sender<TxStatus>>,
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pending_transactions: Cache<TxHash, TxStatus, hashbrown::hash_map::DefaultHashBuilder>,
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open_request_handle_metrics: Arc<OpenRequestHandleMetrics>,
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) -> anyhow::Result<(Arc<Self>, AnyhowJoinHandle<()>)> {
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let (pending_tx_id_sender, pending_tx_id_receiver) = flume::unbounded();
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let (block_sender, block_receiver) = flume::unbounded::<BlockAndRpc>();
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// TODO: query the rpc to get the actual expected block time, or get from config?
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let expected_block_time_ms = match chain_id {
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// ethereum
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1 => 12_000,
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// polygon
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137 => 2_000,
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// fantom
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250 => 1_000,
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// arbitrum
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42161 => 500,
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// anything else
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_ => {
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warn!("unexpected chain_id. polling every {} seconds", 10);
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10_000
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}
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};
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let http_interval_sender = if http_client.is_some() {
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let (sender, receiver) = broadcast::channel(1);
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drop(receiver);
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// TODO: what interval? follow a websocket also? maybe by watching synced connections with a timeout. will need debounce
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let mut interval = interval(Duration::from_millis(expected_block_time_ms));
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interval.set_missed_tick_behavior(MissedTickBehavior::Delay);
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let sender = Arc::new(sender);
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let f = {
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let sender = sender.clone();
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async move {
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loop {
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// TODO: every time a head_block arrives (with a small delay for known slow servers), or on the interval.
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interval.tick().await;
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// // trace!("http interval ready");
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// errors are okay. they mean that all receivers have been dropped
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let _ = sender.send(());
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}
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}
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};
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// TODO: do something with this handle?
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tokio::spawn(f);
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Some(sender)
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} else {
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None
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};
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// turn configs into connections (in parallel)
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// TODO: move this into a helper function. then we can use it when configs change (will need a remove function too)
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let spawn_handles: Vec<_> = server_configs
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.into_iter()
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.filter_map(|(server_name, server_config)| {
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if server_config.disabled {
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return None;
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}
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let db_conn = db_conn.clone();
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let http_client = http_client.clone();
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let redis_pool = redis_pool.clone();
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let http_interval_sender = http_interval_sender.clone();
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let block_sender = if head_block_sender.is_some() {
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Some(block_sender.clone())
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} else {
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None
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};
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let pending_tx_id_sender = Some(pending_tx_id_sender.clone());
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let block_map = block_map.clone();
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let open_request_handle_metrics = open_request_handle_metrics.clone();
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let handle = tokio::spawn(async move {
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server_config
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.spawn(
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server_name,
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db_conn,
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redis_pool,
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chain_id,
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http_client,
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http_interval_sender,
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block_map,
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block_sender,
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pending_tx_id_sender,
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open_request_handle_metrics,
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)
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.await
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});
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Some(handle)
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})
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.collect();
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// map of connection names to their connection
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let mut connections = HashMap::new();
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let mut handles = vec![];
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// TODO: do we need to join this?
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for x in join_all(spawn_handles).await {
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// TODO: how should we handle errors here? one rpc being down shouldn't cause the program to exit
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match x {
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Ok(Ok((connection, handle))) => {
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connections.insert(connection.name.clone(), connection);
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handles.push(handle);
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}
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Ok(Err(err)) => {
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// if we got an error here, it is not retryable
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// TODO: include context about which connection failed
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error!("Unable to create connection. err={:?}", err);
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}
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Err(err) => {
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return Err(err.into());
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}
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}
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}
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let synced_connections = ConsensusConnections::default();
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// TODO: max_capacity and time_to_idle from config
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// all block hashes are the same size, so no need for weigher
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let block_hashes = Cache::builder()
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.time_to_idle(Duration::from_secs(600))
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.max_capacity(10_000)
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.build_with_hasher(hashbrown::hash_map::DefaultHashBuilder::default());
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// all block numbers are the same size, so no need for weigher
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let block_numbers = Cache::builder()
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.time_to_idle(Duration::from_secs(600))
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.max_capacity(10_000)
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.build_with_hasher(hashbrown::hash_map::DefaultHashBuilder::default());
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let connections = Arc::new(Self {
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conns: connections,
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synced_connections: ArcSwap::new(Arc::new(synced_connections)),
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pending_transactions,
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block_hashes,
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block_numbers,
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min_sum_soft_limit,
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min_head_rpcs,
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});
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let authorization = Arc::new(Authorization::internal(db_conn.clone())?);
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let handle = {
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let connections = connections.clone();
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tokio::spawn(async move {
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// TODO: try_join_all with the other handles here
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connections
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.subscribe(
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authorization,
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pending_tx_id_receiver,
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block_receiver,
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head_block_sender,
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pending_tx_sender,
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)
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.await
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})
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};
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Ok((connections, handle))
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}
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pub fn get(&self, conn_name: &str) -> Option<&Arc<Web3Connection>> {
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self.conns.get(conn_name)
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}
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/// subscribe to blocks and transactions from all the backend rpcs.
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/// blocks are processed by all the `Web3Connection`s and then sent to the `block_receiver`
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/// transaction ids from all the `Web3Connection`s are deduplicated and forwarded to `pending_tx_sender`
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async fn subscribe(
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self: Arc<Self>,
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authorization: Arc<Authorization>,
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pending_tx_id_receiver: flume::Receiver<TxHashAndRpc>,
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block_receiver: flume::Receiver<BlockAndRpc>,
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head_block_sender: Option<watch::Sender<ArcBlock>>,
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pending_tx_sender: Option<broadcast::Sender<TxStatus>>,
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) -> anyhow::Result<()> {
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let mut futures = vec![];
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// setup the transaction funnel
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// it skips any duplicates (unless they are being orphaned)
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// fetches new transactions from the notifying rpc
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// forwards new transacitons to pending_tx_receipt_sender
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if let Some(pending_tx_sender) = pending_tx_sender.clone() {
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let clone = self.clone();
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let authorization = authorization.clone();
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let handle = task::spawn(async move {
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// TODO: set up this future the same as the block funnel
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while let Ok((pending_tx_id, rpc)) = pending_tx_id_receiver.recv_async().await {
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let f = clone.clone().process_incoming_tx_id(
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authorization.clone(),
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rpc,
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pending_tx_id,
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pending_tx_sender.clone(),
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);
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tokio::spawn(f);
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}
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Ok(())
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});
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futures.push(flatten_handle(handle));
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}
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// setup the block funnel
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if let Some(head_block_sender) = head_block_sender {
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let connections = Arc::clone(&self);
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let pending_tx_sender = pending_tx_sender.clone();
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let handle = task::Builder::default()
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.name("process_incoming_blocks")
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.spawn(async move {
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connections
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.process_incoming_blocks(
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&authorization,
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block_receiver,
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head_block_sender,
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pending_tx_sender,
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)
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.await
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})?;
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futures.push(flatten_handle(handle));
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}
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if futures.is_empty() {
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// no transaction or block subscriptions.
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let handle = task::Builder::default().name("noop").spawn(async move {
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loop {
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sleep(Duration::from_secs(600)).await;
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// TODO: "every interval, check that the provider is still connected"
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}
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})?;
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futures.push(flatten_handle(handle));
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}
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if let Err(e) = try_join_all(futures).await {
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error!("subscriptions over: {:?}", self);
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return Err(e);
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}
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info!("subscriptions over: {:?}", self);
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Ok(())
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}
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/// Send the same request to all the handles. Returning the most common success or most common error.
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/// TODO: option to return the fastest response and handles for all the others instead?
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pub async fn try_send_parallel_requests(
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&self,
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active_request_handles: Vec<OpenRequestHandle>,
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id: Box<RawValue>,
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method: &str,
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params: Option<&serde_json::Value>,
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error_level: Level,
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// TODO: remove this box once i figure out how to do the options
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) -> anyhow::Result<JsonRpcForwardedResponse> {
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// TODO: if only 1 active_request_handles, do self.try_send_request?
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let responses = active_request_handles
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.into_iter()
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.map(|active_request_handle| async move {
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let result: Result<Box<RawValue>, _> = active_request_handle
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.request(method, &json!(¶ms), error_level.into())
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.await;
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result
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})
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.collect::<FuturesUnordered<_>>()
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.collect::<Vec<Result<Box<RawValue>, ProviderError>>>()
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.await;
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// TODO: Strings are not great keys, but we can't use RawValue or ProviderError as keys because they don't implement Hash or Eq
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let mut count_map: HashMap<String, _> = HashMap::new();
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let mut counts: Counter<String> = Counter::new();
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let mut any_ok_with_json_result = false;
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let mut any_ok_but_maybe_json_error = false;
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for partial_response in responses {
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if partial_response.is_ok() {
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any_ok_with_json_result = true;
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}
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let response =
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JsonRpcForwardedResponse::try_from_response_result(partial_response, id.clone());
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// TODO: better key?
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let s = format!("{:?}", response);
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if count_map.get(&s).is_none() {
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if response.is_ok() {
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any_ok_but_maybe_json_error = true;
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}
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count_map.insert(s.clone(), response);
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}
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counts.update([s].into_iter());
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}
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for (most_common, _) in counts.most_common_ordered() {
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let most_common = count_map
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.remove(&most_common)
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.expect("most_common key must exist");
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match most_common {
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Ok(x) => {
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if any_ok_with_json_result && x.error.is_some() {
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// this one may be an "Ok", but the json has an error inside it
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continue;
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}
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// return the most common success
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return Ok(x);
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}
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Err(err) => {
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if any_ok_but_maybe_json_error {
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// the most common is an error, but there is an Ok in here somewhere. loop to find it
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continue;
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}
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return Err(err);
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}
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}
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}
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// TODO: what should we do if we get here? i don't think we will
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unimplemented!("this shouldn't be possible")
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}
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pub async fn best_consensus_head_connection(
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&self,
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authorization: &Arc<Authorization>,
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request_metadata: Option<&Arc<RequestMetadata>>,
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skip: &[Arc<Web3Connection>],
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min_block_needed: Option<&U64>,
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) -> anyhow::Result<OpenRequestResult> {
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if let Ok(without_backups) = self
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._best_consensus_head_connection(
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false,
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authorization,
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request_metadata,
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skip,
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min_block_needed,
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)
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.await
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{
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return Ok(without_backups);
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}
|
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|
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self._best_consensus_head_connection(
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true,
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authorization,
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request_metadata,
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skip,
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min_block_needed,
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)
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.await
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}
|
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|
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/// get the best available rpc server with the consensus head block. it might have blocks after the consensus head
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async fn _best_consensus_head_connection(
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&self,
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allow_backups: bool,
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authorization: &Arc<Authorization>,
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request_metadata: Option<&Arc<RequestMetadata>>,
|
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skip: &[Arc<Web3Connection>],
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min_block_needed: Option<&U64>,
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) -> anyhow::Result<OpenRequestResult> {
|
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let usable_rpcs_by_head_num_and_weight: BTreeMap<
|
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(Option<U64>, u64),
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Vec<Arc<Web3Connection>>,
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> = if let Some(min_block_needed) = min_block_needed {
|
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// need a potentially old block. check all the rpcs. prefer the most synced
|
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let mut m = BTreeMap::new();
|
|
|
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for x in self
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.conns
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.values()
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.filter(|x| if allow_backups { true } else { !x.backup })
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.filter(|x| !skip.contains(x))
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.filter(|x| x.has_block_data(min_block_needed))
|
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.cloned()
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{
|
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let x_head_block = x.head_block.read().clone();
|
|
|
|
match x_head_block {
|
|
None => continue,
|
|
Some(x_head) => {
|
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let key = (Some(x_head.number()), u64::MAX - x.tier);
|
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|
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m.entry(key).or_insert_with(Vec::new).push(x);
|
|
}
|
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}
|
|
}
|
|
|
|
m
|
|
} else {
|
|
// need latest. filter the synced rpcs
|
|
let synced_connections = self.synced_connections.load();
|
|
|
|
// TODO: if head_block is super old. emit an error!
|
|
|
|
let mut m = BTreeMap::new();
|
|
|
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for x in synced_connections
|
|
.conns
|
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.iter()
|
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.filter(|x| !skip.contains(x))
|
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{
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let key = (None, u64::MAX - x.tier);
|
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|
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m.entry(key).or_insert_with(Vec::new).push(x.clone());
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}
|
|
|
|
m
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};
|
|
|
|
let mut earliest_retry_at = None;
|
|
|
|
for usable_rpcs in usable_rpcs_by_head_num_and_weight.into_values().rev() {
|
|
// under heavy load, it is possible for even our best server to be negative
|
|
let mut minimum = f64::MAX;
|
|
let mut maximum = f64::MIN;
|
|
|
|
// we sort on a combination of values. cache them here so that we don't do this math multiple times.
|
|
let mut available_request_map: HashMap<_, f64> = usable_rpcs
|
|
.iter()
|
|
.map(|rpc| {
|
|
// TODO: are active requests what we want? do we want a counter for requests in the last second + any actives longer than that?
|
|
// TODO: get active requests out of redis (that's definitely too slow)
|
|
// TODO: do something with hard limit instead? (but that is hitting redis too much)
|
|
let active_requests = rpc.active_requests() as f64;
|
|
let soft_limit = rpc.soft_limit as f64;
|
|
|
|
let available_requests = soft_limit - active_requests;
|
|
|
|
trace!("available requests on {}: {}", rpc, available_requests);
|
|
|
|
minimum = minimum.min(available_requests);
|
|
maximum = maximum.max(available_requests);
|
|
|
|
(rpc, available_requests)
|
|
})
|
|
.collect();
|
|
|
|
trace!("minimum available requests: {}", minimum);
|
|
trace!("maximum available requests: {}", maximum);
|
|
|
|
if maximum < 0.0 {
|
|
// TODO: if maximum < 0 and there are other tiers on the same block, we should include them now
|
|
warn!("soft limits overloaded: {} to {}", minimum, maximum)
|
|
}
|
|
|
|
// choose_multiple_weighted can't have negative numbers. shift up if any are negative
|
|
// TODO: is this a correct way to shift?
|
|
if minimum < 0.0 {
|
|
available_request_map = available_request_map
|
|
.into_iter()
|
|
.map(|(rpc, available_requests)| {
|
|
// TODO: is simple addition the right way to shift everyone?
|
|
// TODO: probably want something non-linear
|
|
// minimum is negative, so we subtract to make available requests bigger
|
|
let x = available_requests - minimum;
|
|
|
|
(rpc, x)
|
|
})
|
|
.collect()
|
|
}
|
|
|
|
let sorted_rpcs = {
|
|
if usable_rpcs.len() == 1 {
|
|
// TODO: return now instead? we shouldn't need another alloc
|
|
vec![usable_rpcs.get(0).expect("there should be 1")]
|
|
} else {
|
|
let mut rng = thread_fast_rng::thread_fast_rng();
|
|
|
|
usable_rpcs
|
|
.choose_multiple_weighted(&mut rng, usable_rpcs.len(), |rpc| {
|
|
*available_request_map
|
|
.get(rpc)
|
|
.expect("rpc should always be in available_request_map")
|
|
})
|
|
.unwrap()
|
|
.collect::<Vec<_>>()
|
|
}
|
|
};
|
|
|
|
// now that the rpcs are sorted, try to get an active request handle for one of them
|
|
for best_rpc in sorted_rpcs.into_iter() {
|
|
// increment our connection counter
|
|
match best_rpc
|
|
.try_request_handle(authorization, min_block_needed.is_none())
|
|
.await
|
|
{
|
|
Ok(OpenRequestResult::Handle(handle)) => {
|
|
trace!("opened handle: {}", best_rpc);
|
|
return Ok(OpenRequestResult::Handle(handle));
|
|
}
|
|
Ok(OpenRequestResult::RetryAt(retry_at)) => {
|
|
earliest_retry_at = earliest_retry_at.min(Some(retry_at));
|
|
}
|
|
Ok(OpenRequestResult::NotReady) => {
|
|
// TODO: log a warning? emit a stat?
|
|
}
|
|
Err(err) => {
|
|
warn!("No request handle for {}. err={:?}", best_rpc, err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if let Some(request_metadata) = request_metadata {
|
|
request_metadata.no_servers.fetch_add(1, Ordering::Release);
|
|
}
|
|
|
|
match earliest_retry_at {
|
|
None => {
|
|
// none of the servers gave us a time to retry at
|
|
|
|
// TODO: bring this back? need to think about how to do this with `allow_backups`
|
|
// we could return an error here, but maybe waiting a second will fix the problem
|
|
// TODO: configurable max wait? the whole max request time, or just some portion?
|
|
// let handle = sorted_rpcs
|
|
// .get(0)
|
|
// .expect("at least 1 is available")
|
|
// .wait_for_request_handle(authorization, Duration::from_secs(3), false)
|
|
// .await?;
|
|
// Ok(OpenRequestResult::Handle(handle))
|
|
|
|
// TODO: should we log here?
|
|
|
|
Ok(OpenRequestResult::NotReady)
|
|
}
|
|
Some(earliest_retry_at) => {
|
|
warn!("no servers on {:?}! {:?}", self, earliest_retry_at);
|
|
|
|
Ok(OpenRequestResult::RetryAt(earliest_retry_at))
|
|
}
|
|
}
|
|
}
|
|
|
|
/// get all rpc servers that are not rate limited
|
|
/// returns servers even if they aren't fully in sync. This is useful for broadcasting signed transactions
|
|
// TODO: better type on this that can return an anyhow::Result
|
|
pub async fn all_synced_connections(
|
|
&self,
|
|
authorization: &Arc<Authorization>,
|
|
block_needed: Option<&U64>,
|
|
max_count: Option<usize>,
|
|
) -> Result<Vec<OpenRequestHandle>, Option<Instant>> {
|
|
if let Ok(without_backups) = self
|
|
._all_synced_connections(false, authorization, block_needed, max_count)
|
|
.await
|
|
{
|
|
return Ok(without_backups);
|
|
}
|
|
|
|
self._all_synced_connections(true, authorization, block_needed, max_count)
|
|
.await
|
|
}
|
|
|
|
async fn _all_synced_connections(
|
|
&self,
|
|
allow_backups: bool,
|
|
authorization: &Arc<Authorization>,
|
|
block_needed: Option<&U64>,
|
|
max_count: Option<usize>,
|
|
) -> Result<Vec<OpenRequestHandle>, Option<Instant>> {
|
|
let mut earliest_retry_at = None;
|
|
// TODO: with capacity?
|
|
let mut selected_rpcs = vec![];
|
|
|
|
let mut max_count = if max_count.is_none() {
|
|
self.conns.len()
|
|
} else {
|
|
self.conns.len().min(max_count.unwrap())
|
|
};
|
|
|
|
for connection in self.conns.values() {
|
|
if max_count == 0 {
|
|
break;
|
|
}
|
|
|
|
if !allow_backups && connection.backup {
|
|
continue;
|
|
}
|
|
|
|
if let Some(block_needed) = block_needed {
|
|
if !connection.has_block_data(block_needed) {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// check rate limits and increment our connection counter
|
|
match connection
|
|
.try_request_handle(authorization, block_needed.is_none())
|
|
.await
|
|
{
|
|
Ok(OpenRequestResult::RetryAt(retry_at)) => {
|
|
// this rpc is not available. skip it
|
|
earliest_retry_at = earliest_retry_at.min(Some(retry_at));
|
|
}
|
|
Ok(OpenRequestResult::Handle(handle)) => {
|
|
max_count -= 1;
|
|
selected_rpcs.push(handle)
|
|
}
|
|
Ok(OpenRequestResult::NotReady) => {
|
|
warn!("no request handle for {}", connection)
|
|
}
|
|
Err(err) => {
|
|
warn!(
|
|
"error getting request handle for {}. err={:?}",
|
|
connection, err
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
if !selected_rpcs.is_empty() {
|
|
return Ok(selected_rpcs);
|
|
}
|
|
|
|
// return the earliest retry_after (if no rpcs are synced, this will be None)
|
|
Err(earliest_retry_at)
|
|
}
|
|
|
|
/// be sure there is a timeout on this or it might loop forever
|
|
pub async fn try_send_best_consensus_head_connection(
|
|
&self,
|
|
authorization: &Arc<Authorization>,
|
|
request: JsonRpcRequest,
|
|
request_metadata: Option<&Arc<RequestMetadata>>,
|
|
min_block_needed: Option<&U64>,
|
|
) -> anyhow::Result<JsonRpcForwardedResponse> {
|
|
let mut skip_rpcs = vec![];
|
|
|
|
// TODO: maximum retries? right now its the total number of servers
|
|
loop {
|
|
if skip_rpcs.len() == self.conns.len() {
|
|
// no servers to try
|
|
break;
|
|
}
|
|
match self
|
|
.best_consensus_head_connection(
|
|
authorization,
|
|
request_metadata,
|
|
&skip_rpcs,
|
|
min_block_needed,
|
|
)
|
|
.await?
|
|
{
|
|
OpenRequestResult::Handle(active_request_handle) => {
|
|
// save the rpc in case we get an error and want to retry on another server
|
|
skip_rpcs.push(active_request_handle.clone_connection());
|
|
|
|
if let Some(request_metadata) = request_metadata {
|
|
// TODO: request_metadata.backend_requests instead of skip_rpcs
|
|
request_metadata
|
|
.backend_requests
|
|
.lock()
|
|
.push(active_request_handle.clone_connection());
|
|
}
|
|
|
|
// TODO: get the log percent from the user data
|
|
let response_result = active_request_handle
|
|
.request(
|
|
&request.method,
|
|
&json!(request.params),
|
|
RequestRevertHandler::Save,
|
|
)
|
|
.await;
|
|
|
|
match JsonRpcForwardedResponse::try_from_response_result(
|
|
response_result,
|
|
request.id.clone(),
|
|
) {
|
|
Ok(response) => {
|
|
if let Some(error) = &response.error {
|
|
// trace!(?response, "rpc error");
|
|
|
|
if let Some(request_metadata) = request_metadata {
|
|
request_metadata
|
|
.error_response
|
|
.store(true, Ordering::Release);
|
|
}
|
|
|
|
// some errors should be retried on other nodes
|
|
let error_msg = error.message.as_str();
|
|
|
|
// different providers do different codes. check all of them
|
|
// TODO: there's probably more strings to add here
|
|
let rate_limit_substrings = ["limit", "exceeded"];
|
|
for rate_limit_substr in rate_limit_substrings {
|
|
if error_msg.contains(rate_limit_substr) {
|
|
warn!("rate limited by {}", skip_rpcs.last().unwrap());
|
|
continue;
|
|
}
|
|
}
|
|
|
|
match error.code {
|
|
-32000 => {
|
|
// TODO: regex?
|
|
let retry_prefixes = [
|
|
"header not found",
|
|
"header for hash not found",
|
|
"missing trie node",
|
|
"node not started",
|
|
"RPC timeout",
|
|
];
|
|
for retry_prefix in retry_prefixes {
|
|
if error_msg.starts_with(retry_prefix) {
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
-32601 => {
|
|
let error_msg = error.message.as_str();
|
|
|
|
if error_msg.starts_with("the method")
|
|
&& error_msg.ends_with("is not available")
|
|
{
|
|
continue;
|
|
}
|
|
}
|
|
_ => {}
|
|
}
|
|
} else {
|
|
// trace!(?response, "rpc success");
|
|
}
|
|
|
|
return Ok(response);
|
|
}
|
|
Err(err) => {
|
|
let rpc = skip_rpcs
|
|
.last()
|
|
.expect("there must have been a provider if we got an error");
|
|
|
|
// TODO: emit a stat. if a server is getting skipped a lot, something is not right
|
|
|
|
debug!(
|
|
"Backend server error on {}! Retrying on another. err={:?}",
|
|
rpc, err
|
|
);
|
|
|
|
// TODO: sleep how long? until synced_connections changes or rate limits are available
|
|
// sleep(Duration::from_millis(100)).await;
|
|
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
OpenRequestResult::RetryAt(retry_at) => {
|
|
// TODO: move this to a helper function
|
|
// sleep (TODO: with a lock?) until our rate limits should be available
|
|
// TODO: if a server catches up sync while we are waiting, we could stop waiting
|
|
warn!("All rate limits exceeded. Sleeping until {:?}", retry_at);
|
|
|
|
// TODO: have a separate column for rate limited?
|
|
if let Some(request_metadata) = request_metadata {
|
|
request_metadata.no_servers.fetch_add(1, Ordering::Release);
|
|
}
|
|
|
|
sleep_until(retry_at).await;
|
|
|
|
continue;
|
|
}
|
|
OpenRequestResult::NotReady => {
|
|
if let Some(request_metadata) = request_metadata {
|
|
request_metadata.no_servers.fetch_add(1, Ordering::Release);
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// TODO: do we need this here, or do we do it somewhere else?
|
|
if let Some(request_metadata) = request_metadata {
|
|
request_metadata
|
|
.error_response
|
|
.store(true, Ordering::Release);
|
|
}
|
|
|
|
let num_conns = self.conns.len();
|
|
|
|
error!("No servers synced ({} known)", num_conns);
|
|
|
|
Err(anyhow::anyhow!("No servers synced ({} known)", num_conns))
|
|
}
|
|
|
|
/// be sure there is a timeout on this or it might loop forever
|
|
pub async fn try_send_all_synced_connections(
|
|
&self,
|
|
authorization: &Arc<Authorization>,
|
|
request: &JsonRpcRequest,
|
|
request_metadata: Option<Arc<RequestMetadata>>,
|
|
block_needed: Option<&U64>,
|
|
error_level: Level,
|
|
max_count: Option<usize>,
|
|
) -> anyhow::Result<JsonRpcForwardedResponse> {
|
|
loop {
|
|
match self
|
|
.all_synced_connections(authorization, block_needed, max_count)
|
|
.await
|
|
{
|
|
Ok(active_request_handles) => {
|
|
// TODO: benchmark this compared to waiting on unbounded futures
|
|
// TODO: do something with this handle?
|
|
// TODO: this is not working right. simplify
|
|
|
|
if let Some(request_metadata) = request_metadata {
|
|
request_metadata
|
|
.backend_requests
|
|
.lock()
|
|
.extend(active_request_handles.iter().map(|x| x.clone_connection()));
|
|
}
|
|
|
|
return self
|
|
.try_send_parallel_requests(
|
|
active_request_handles,
|
|
request.id.clone(),
|
|
request.method.as_ref(),
|
|
request.params.as_ref(),
|
|
error_level,
|
|
)
|
|
.await;
|
|
}
|
|
Err(None) => {
|
|
warn!("No servers in sync on {:?}! Retrying", self);
|
|
|
|
if let Some(request_metadata) = &request_metadata {
|
|
request_metadata.no_servers.fetch_add(1, Ordering::Release);
|
|
}
|
|
|
|
// TODO: i don't think this will ever happen
|
|
// TODO: return a 502? if it does?
|
|
// return Err(anyhow::anyhow!("no available rpcs!"));
|
|
// TODO: sleep how long?
|
|
// TODO: subscribe to something in ConsensusConnections instead
|
|
sleep(Duration::from_millis(200)).await;
|
|
|
|
continue;
|
|
}
|
|
Err(Some(retry_at)) => {
|
|
// TODO: move this to a helper function
|
|
// sleep (TODO: with a lock?) until our rate limits should be available
|
|
// TODO: if a server catches up sync while we are waiting, we could stop waiting
|
|
warn!("All rate limits exceeded. Sleeping");
|
|
|
|
if let Some(request_metadata) = &request_metadata {
|
|
request_metadata.no_servers.fetch_add(1, Ordering::Release);
|
|
}
|
|
|
|
sleep_until(retry_at).await;
|
|
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub async fn try_proxy_connection(
|
|
&self,
|
|
proxy_mode: ProxyMode,
|
|
authorization: &Arc<Authorization>,
|
|
request: JsonRpcRequest,
|
|
request_metadata: Option<&Arc<RequestMetadata>>,
|
|
min_block_needed: Option<&U64>,
|
|
) -> anyhow::Result<JsonRpcForwardedResponse> {
|
|
match proxy_mode {
|
|
ProxyMode::Best => {
|
|
self.try_send_best_consensus_head_connection(
|
|
authorization,
|
|
request,
|
|
request_metadata,
|
|
min_block_needed,
|
|
)
|
|
.await
|
|
}
|
|
ProxyMode::Fastest(x) => todo!("Fastest"),
|
|
ProxyMode::Versus => todo!("Versus"),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl fmt::Debug for Web3Connections {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
// TODO: the default formatter takes forever to write. this is too quiet though
|
|
f.debug_struct("Web3Connections")
|
|
.field("conns", &self.conns)
|
|
.finish_non_exhaustive()
|
|
}
|
|
}
|
|
|
|
impl Serialize for Web3Connections {
|
|
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
|
|
where
|
|
S: Serializer,
|
|
{
|
|
let mut state = serializer.serialize_struct("Web3Connections", 6)?;
|
|
|
|
let conns: Vec<&Web3Connection> = self.conns.values().map(|x| x.as_ref()).collect();
|
|
state.serialize_field("conns", &conns)?;
|
|
|
|
let synced_connections = &**self.synced_connections.load();
|
|
state.serialize_field("synced_connections", synced_connections)?;
|
|
|
|
self.block_hashes.sync();
|
|
self.block_numbers.sync();
|
|
state.serialize_field("block_hashes_count", &self.block_hashes.entry_count())?;
|
|
state.serialize_field("block_hashes_size", &self.block_hashes.weighted_size())?;
|
|
state.serialize_field("block_numbers_count", &self.block_numbers.entry_count())?;
|
|
state.serialize_field("block_numbers_size", &self.block_numbers.weighted_size())?;
|
|
state.end()
|
|
}
|
|
}
|
|
|
|
mod tests {
|
|
// TODO: why is this allow needed? does tokio::test get in the way somehow?
|
|
#![allow(unused_imports)]
|
|
use super::*;
|
|
use crate::rpcs::{
|
|
blockchain::{ConsensusFinder, SavedBlock},
|
|
connection::ProviderState,
|
|
provider::Web3Provider,
|
|
};
|
|
use ethers::types::{Block, U256};
|
|
use log::{trace, LevelFilter};
|
|
use parking_lot::RwLock;
|
|
use std::time::{SystemTime, UNIX_EPOCH};
|
|
use tokio::sync::RwLock as AsyncRwLock;
|
|
|
|
#[tokio::test]
|
|
async fn test_server_selection_by_height() {
|
|
// TODO: do this better. can test_env_logger and tokio test be stacked?
|
|
let _ = env_logger::builder()
|
|
.filter_level(LevelFilter::Error)
|
|
.filter_module("web3_proxy", LevelFilter::Trace)
|
|
.is_test(true)
|
|
.try_init();
|
|
|
|
let now: U256 = SystemTime::now()
|
|
.duration_since(UNIX_EPOCH)
|
|
.unwrap()
|
|
.as_secs()
|
|
.into();
|
|
|
|
let lagged_block = Block {
|
|
hash: Some(H256::random()),
|
|
number: Some(0.into()),
|
|
timestamp: now - 1,
|
|
..Default::default()
|
|
};
|
|
|
|
let head_block = Block {
|
|
hash: Some(H256::random()),
|
|
number: Some(1.into()),
|
|
parent_hash: lagged_block.hash.unwrap(),
|
|
timestamp: now,
|
|
..Default::default()
|
|
};
|
|
|
|
let lagged_block = Arc::new(lagged_block);
|
|
let head_block = Arc::new(head_block);
|
|
|
|
// TODO: write a impl From for Block -> BlockId?
|
|
let mut lagged_block: SavedBlock = lagged_block.into();
|
|
let mut head_block: SavedBlock = head_block.into();
|
|
|
|
let block_data_limit = u64::MAX;
|
|
|
|
let head_rpc = Web3Connection {
|
|
name: "synced".to_string(),
|
|
db_conn: None,
|
|
display_name: None,
|
|
url: "ws://example.com/synced".to_string(),
|
|
http_client: None,
|
|
active_requests: 0.into(),
|
|
frontend_requests: 0.into(),
|
|
internal_requests: 0.into(),
|
|
provider_state: AsyncRwLock::new(ProviderState::Ready(Arc::new(Web3Provider::Mock))),
|
|
hard_limit: None,
|
|
soft_limit: 1_000,
|
|
automatic_block_limit: true,
|
|
backup: false,
|
|
block_data_limit: block_data_limit.into(),
|
|
tier: 0,
|
|
head_block: RwLock::new(Some(head_block.clone())),
|
|
open_request_handle_metrics: Arc::new(Default::default()),
|
|
};
|
|
|
|
let lagged_rpc = Web3Connection {
|
|
name: "lagged".to_string(),
|
|
db_conn: None,
|
|
display_name: None,
|
|
url: "ws://example.com/lagged".to_string(),
|
|
http_client: None,
|
|
active_requests: 0.into(),
|
|
frontend_requests: 0.into(),
|
|
internal_requests: 0.into(),
|
|
provider_state: AsyncRwLock::new(ProviderState::Ready(Arc::new(Web3Provider::Mock))),
|
|
hard_limit: None,
|
|
soft_limit: 1_000,
|
|
automatic_block_limit: false,
|
|
backup: false,
|
|
block_data_limit: block_data_limit.into(),
|
|
tier: 0,
|
|
head_block: RwLock::new(Some(lagged_block.clone())),
|
|
open_request_handle_metrics: Arc::new(Default::default()),
|
|
};
|
|
|
|
assert!(head_rpc.has_block_data(&lagged_block.number()));
|
|
assert!(head_rpc.has_block_data(&head_block.number()));
|
|
|
|
assert!(lagged_rpc.has_block_data(&lagged_block.number()));
|
|
assert!(!lagged_rpc.has_block_data(&head_block.number()));
|
|
|
|
let head_rpc = Arc::new(head_rpc);
|
|
let lagged_rpc = Arc::new(lagged_rpc);
|
|
|
|
let conns = HashMap::from([
|
|
(head_rpc.name.clone(), head_rpc.clone()),
|
|
(lagged_rpc.name.clone(), lagged_rpc.clone()),
|
|
]);
|
|
|
|
let conns = Web3Connections {
|
|
conns,
|
|
synced_connections: Default::default(),
|
|
pending_transactions: Cache::builder()
|
|
.max_capacity(10_000)
|
|
.build_with_hasher(hashbrown::hash_map::DefaultHashBuilder::default()),
|
|
block_hashes: Cache::builder()
|
|
.max_capacity(10_000)
|
|
.build_with_hasher(hashbrown::hash_map::DefaultHashBuilder::default()),
|
|
block_numbers: Cache::builder()
|
|
.max_capacity(10_000)
|
|
.build_with_hasher(hashbrown::hash_map::DefaultHashBuilder::default()),
|
|
min_head_rpcs: 1,
|
|
min_sum_soft_limit: 1,
|
|
};
|
|
|
|
let authorization = Arc::new(Authorization::internal(None).unwrap());
|
|
|
|
let (head_block_sender, _head_block_receiver) =
|
|
watch::channel::<ArcBlock>(Default::default());
|
|
let mut connection_heads = ConsensusFinder::default();
|
|
|
|
// process None so that
|
|
conns
|
|
.process_block_from_rpc(
|
|
&authorization,
|
|
&mut connection_heads,
|
|
None,
|
|
lagged_rpc.clone(),
|
|
&head_block_sender,
|
|
&None,
|
|
)
|
|
.await
|
|
.unwrap();
|
|
conns
|
|
.process_block_from_rpc(
|
|
&authorization,
|
|
&mut connection_heads,
|
|
None,
|
|
head_rpc.clone(),
|
|
&head_block_sender,
|
|
&None,
|
|
)
|
|
.await
|
|
.unwrap();
|
|
|
|
// no head block because the rpcs haven't communicated through their channels
|
|
assert!(conns.head_block_hash().is_none());
|
|
|
|
// all_backend_connections gives everything regardless of sync status
|
|
assert_eq!(
|
|
conns
|
|
.all_synced_connections(&authorization, None, None)
|
|
.await
|
|
.unwrap()
|
|
.len(),
|
|
2
|
|
);
|
|
|
|
// best_synced_backend_connection requires servers to be synced with the head block
|
|
let x = conns
|
|
.best_consensus_head_connection(&authorization, None, &[], None)
|
|
.await
|
|
.unwrap();
|
|
|
|
dbg!(&x);
|
|
|
|
assert!(matches!(x, OpenRequestResult::NotReady));
|
|
|
|
// add lagged blocks to the conns. both servers should be allowed
|
|
lagged_block.block = conns.save_block(lagged_block.block, true).await.unwrap();
|
|
|
|
conns
|
|
.process_block_from_rpc(
|
|
&authorization,
|
|
&mut connection_heads,
|
|
Some(lagged_block.clone()),
|
|
lagged_rpc,
|
|
&head_block_sender,
|
|
&None,
|
|
)
|
|
.await
|
|
.unwrap();
|
|
conns
|
|
.process_block_from_rpc(
|
|
&authorization,
|
|
&mut connection_heads,
|
|
Some(lagged_block.clone()),
|
|
head_rpc.clone(),
|
|
&head_block_sender,
|
|
&None,
|
|
)
|
|
.await
|
|
.unwrap();
|
|
|
|
assert_eq!(conns.num_synced_rpcs(), 2);
|
|
|
|
// add head block to the conns. lagged_rpc should not be available
|
|
head_block.block = conns.save_block(head_block.block, true).await.unwrap();
|
|
|
|
conns
|
|
.process_block_from_rpc(
|
|
&authorization,
|
|
&mut connection_heads,
|
|
Some(head_block.clone()),
|
|
head_rpc,
|
|
&head_block_sender,
|
|
&None,
|
|
)
|
|
.await
|
|
.unwrap();
|
|
|
|
assert_eq!(conns.num_synced_rpcs(), 1);
|
|
|
|
assert!(matches!(
|
|
conns
|
|
.best_consensus_head_connection(&authorization, None, &[], None)
|
|
.await,
|
|
Ok(OpenRequestResult::Handle(_))
|
|
));
|
|
|
|
assert!(matches!(
|
|
conns
|
|
.best_consensus_head_connection(&authorization, None, &[], Some(&0.into()))
|
|
.await,
|
|
Ok(OpenRequestResult::Handle(_))
|
|
));
|
|
|
|
assert!(matches!(
|
|
conns
|
|
.best_consensus_head_connection(&authorization, None, &[], Some(&1.into()))
|
|
.await,
|
|
Ok(OpenRequestResult::Handle(_))
|
|
));
|
|
|
|
// future block should not get a handle
|
|
assert!(matches!(
|
|
conns
|
|
.best_consensus_head_connection(&authorization, None, &[], Some(&2.into()))
|
|
.await,
|
|
Ok(OpenRequestResult::NotReady)
|
|
));
|
|
}
|
|
|
|
#[tokio::test]
|
|
async fn test_server_selection_by_archive() {
|
|
// TODO: do this better. can test_env_logger and tokio test be stacked?
|
|
let _ = env_logger::builder()
|
|
.filter_level(LevelFilter::Error)
|
|
.filter_module("web3_proxy", LevelFilter::Trace)
|
|
.is_test(true)
|
|
.try_init();
|
|
|
|
let now: U256 = SystemTime::now()
|
|
.duration_since(UNIX_EPOCH)
|
|
.unwrap()
|
|
.as_secs()
|
|
.into();
|
|
|
|
let head_block = Block {
|
|
hash: Some(H256::random()),
|
|
number: Some(1_000_000.into()),
|
|
parent_hash: H256::random(),
|
|
timestamp: now,
|
|
..Default::default()
|
|
};
|
|
|
|
let head_block: SavedBlock = Arc::new(head_block).into();
|
|
|
|
let pruned_rpc = Web3Connection {
|
|
name: "pruned".to_string(),
|
|
db_conn: None,
|
|
display_name: None,
|
|
url: "ws://example.com/pruned".to_string(),
|
|
http_client: None,
|
|
active_requests: 0.into(),
|
|
frontend_requests: 0.into(),
|
|
internal_requests: 0.into(),
|
|
provider_state: AsyncRwLock::new(ProviderState::Ready(Arc::new(Web3Provider::Mock))),
|
|
hard_limit: None,
|
|
soft_limit: 3_000,
|
|
automatic_block_limit: false,
|
|
backup: false,
|
|
block_data_limit: 64.into(),
|
|
tier: 1,
|
|
head_block: RwLock::new(Some(head_block.clone())),
|
|
open_request_handle_metrics: Arc::new(Default::default()),
|
|
};
|
|
|
|
let archive_rpc = Web3Connection {
|
|
name: "archive".to_string(),
|
|
db_conn: None,
|
|
display_name: None,
|
|
url: "ws://example.com/archive".to_string(),
|
|
http_client: None,
|
|
active_requests: 0.into(),
|
|
frontend_requests: 0.into(),
|
|
internal_requests: 0.into(),
|
|
provider_state: AsyncRwLock::new(ProviderState::Ready(Arc::new(Web3Provider::Mock))),
|
|
hard_limit: None,
|
|
soft_limit: 1_000,
|
|
automatic_block_limit: false,
|
|
backup: false,
|
|
block_data_limit: u64::MAX.into(),
|
|
tier: 2,
|
|
head_block: RwLock::new(Some(head_block.clone())),
|
|
open_request_handle_metrics: Arc::new(Default::default()),
|
|
};
|
|
|
|
assert!(pruned_rpc.has_block_data(&head_block.number()));
|
|
assert!(archive_rpc.has_block_data(&head_block.number()));
|
|
assert!(!pruned_rpc.has_block_data(&1.into()));
|
|
assert!(archive_rpc.has_block_data(&1.into()));
|
|
|
|
let pruned_rpc = Arc::new(pruned_rpc);
|
|
let archive_rpc = Arc::new(archive_rpc);
|
|
|
|
let conns = HashMap::from([
|
|
(pruned_rpc.name.clone(), pruned_rpc.clone()),
|
|
(archive_rpc.name.clone(), archive_rpc.clone()),
|
|
]);
|
|
|
|
let conns = Web3Connections {
|
|
conns,
|
|
synced_connections: Default::default(),
|
|
pending_transactions: Cache::builder()
|
|
.max_capacity(10)
|
|
.build_with_hasher(hashbrown::hash_map::DefaultHashBuilder::default()),
|
|
block_hashes: Cache::builder()
|
|
.max_capacity(10)
|
|
.build_with_hasher(hashbrown::hash_map::DefaultHashBuilder::default()),
|
|
block_numbers: Cache::builder()
|
|
.max_capacity(10)
|
|
.build_with_hasher(hashbrown::hash_map::DefaultHashBuilder::default()),
|
|
min_head_rpcs: 1,
|
|
min_sum_soft_limit: 3_000,
|
|
};
|
|
|
|
let authorization = Arc::new(Authorization::internal(None).unwrap());
|
|
|
|
let (head_block_sender, _head_block_receiver) =
|
|
watch::channel::<ArcBlock>(Default::default());
|
|
let mut connection_heads = ConsensusFinder::default();
|
|
|
|
conns
|
|
.process_block_from_rpc(
|
|
&authorization,
|
|
&mut connection_heads,
|
|
Some(head_block.clone()),
|
|
pruned_rpc.clone(),
|
|
&head_block_sender,
|
|
&None,
|
|
)
|
|
.await
|
|
.unwrap();
|
|
conns
|
|
.process_block_from_rpc(
|
|
&authorization,
|
|
&mut connection_heads,
|
|
Some(head_block.clone()),
|
|
archive_rpc.clone(),
|
|
&head_block_sender,
|
|
&None,
|
|
)
|
|
.await
|
|
.unwrap();
|
|
|
|
assert_eq!(conns.num_synced_rpcs(), 2);
|
|
|
|
// best_synced_backend_connection requires servers to be synced with the head block
|
|
let best_head_server = conns
|
|
.best_consensus_head_connection(&authorization, None, &[], Some(&head_block.number()))
|
|
.await;
|
|
|
|
assert!(matches!(
|
|
best_head_server.unwrap(),
|
|
OpenRequestResult::Handle(_)
|
|
));
|
|
|
|
let best_archive_server = conns
|
|
.best_consensus_head_connection(&authorization, None, &[], Some(&1.into()))
|
|
.await;
|
|
|
|
match best_archive_server {
|
|
Ok(OpenRequestResult::Handle(x)) => {
|
|
assert_eq!(x.clone_connection().name, "archive".to_string())
|
|
}
|
|
x => {
|
|
error!("unexpected result: {:?}", x);
|
|
}
|
|
}
|
|
}
|
|
}
|