Further remove EE redundancy (#3324)
## Issue Addressed Resolves #3176 ## Proposed Changes Continues from PRs by @divagant-martian to gradually remove EL redundancy (see #3284, #3257). This PR achieves: - Removes the `broadcast` and `first_success` methods. The functional impact is that every request to the EE will always be tried immediately, regardless of the cached `EngineState` (this resolves #3176). Previously we would check the engine state before issuing requests, this doesn't make sense in a single-EE world; there's only one EE so we might as well try it for every request. - Runs the upcheck/watchdog routine once per slot rather than thrice. When we had multiple EEs frequent polling was useful to try and detect when the primary EE had come back online and we could switch to it. That's not as relevant now. - Always creates logs in the `Engines::upcheck` function. Previously we would mute some logs since they could get really noisy when one EE was down but others were functioning fine. Now we only have one EE and are upcheck-ing it less, it makes sense to always produce logs. This PR purposefully does not achieve: - Updating all occurances of "engines" to "engine". I'm trying to keep the diff small and manageable. We can come back for this. ## Additional Info NA
This commit is contained in:
Paul Hauner
parent
a390695e0f
commit
7a6e6928a3
@ -1003,6 +1003,11 @@ async fn payload_preparation_before_transition_block() {
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let rig = InvalidPayloadRig::new();
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let el = rig.execution_layer();
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// Run the watchdog routine so that the status of the execution engine is set. This ensures
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// that we don't end up with `eth_syncing` requests later in this function that will impede
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// testing.
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el.watchdog_task().await;
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let head = rig.harness.chain.head_snapshot();
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assert_eq!(
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head.beacon_block
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@ -5,8 +5,10 @@ use crate::engine_api::{
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};
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use crate::HttpJsonRpc;
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use lru::LruCache;
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use slog::{crit, debug, info, warn, Logger};
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use slog::{debug, error, info, Logger};
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use std::future::Future;
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use std::sync::Arc;
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use task_executor::TaskExecutor;
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use tokio::sync::{Mutex, RwLock};
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use types::{Address, ExecutionBlockHash, Hash256};
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@ -16,7 +18,7 @@ use types::{Address, ExecutionBlockHash, Hash256};
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const PAYLOAD_ID_LRU_CACHE_SIZE: usize = 512;
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/// Stores the remembered state of a engine.
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#[derive(Copy, Clone, PartialEq)]
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#[derive(Copy, Clone, PartialEq, Debug)]
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enum EngineState {
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Synced,
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Offline,
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@ -31,22 +33,6 @@ pub struct ForkChoiceState {
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pub finalized_block_hash: ExecutionBlockHash,
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}
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/// Used to enable/disable logging on some tasks.
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#[derive(Copy, Clone, PartialEq)]
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pub enum Logging {
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Enabled,
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Disabled,
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}
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impl Logging {
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pub fn is_enabled(&self) -> bool {
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match self {
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Logging::Enabled => true,
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Logging::Disabled => false,
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}
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}
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}
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#[derive(Hash, PartialEq, std::cmp::Eq)]
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struct PayloadIdCacheKey {
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pub head_block_hash: ExecutionBlockHash,
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@ -69,17 +55,19 @@ pub struct Engine {
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payload_id_cache: Mutex<LruCache<PayloadIdCacheKey, PayloadId>>,
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state: RwLock<EngineState>,
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pub latest_forkchoice_state: RwLock<Option<ForkChoiceState>>,
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pub executor: TaskExecutor,
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pub log: Logger,
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}
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impl Engine {
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/// Creates a new, offline engine.
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pub fn new(api: HttpJsonRpc, log: &Logger) -> Self {
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pub fn new(api: HttpJsonRpc, executor: TaskExecutor, log: &Logger) -> Self {
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Self {
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api,
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payload_id_cache: Mutex::new(LruCache::new(PAYLOAD_ID_LRU_CACHE_SIZE)),
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state: RwLock::new(EngineState::Offline),
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latest_forkchoice_state: Default::default(),
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executor,
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log: log.clone(),
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}
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}
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@ -179,168 +167,121 @@ impl Engine {
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pub async fn is_synced(&self) -> bool {
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*self.state.read().await == EngineState::Synced
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}
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/// Run the `EngineApi::upcheck` function if the node's last known state is not synced. This
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/// might be used to recover the node if offline.
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pub async fn upcheck_not_synced(&self, logging: Logging) {
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let mut state_lock = self.state.write().await;
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if *state_lock != EngineState::Synced {
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match self.api.upcheck().await {
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pub async fn upcheck(&self) {
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let state: EngineState = match self.api.upcheck().await {
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Ok(()) => {
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if logging.is_enabled() {
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let mut state = self.state.write().await;
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if *state != EngineState::Synced {
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info!(
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self.log,
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"Execution engine online";
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);
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}
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// Send the node our latest forkchoice_state.
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self.send_latest_forkchoice_state().await;
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} else {
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debug!(
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self.log,
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"Execution engine online";
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);
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}
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*state_lock = EngineState::Synced
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*state = EngineState::Synced;
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*state
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}
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Err(EngineApiError::IsSyncing) => {
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if logging.is_enabled() {
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warn!(
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self.log,
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"Execution engine syncing";
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)
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}
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// Send the node our latest forkchoice_state, it may assist with syncing.
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self.send_latest_forkchoice_state().await;
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*state_lock = EngineState::Syncing
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let mut state = self.state.write().await;
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*state = EngineState::Syncing;
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*state
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}
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Err(EngineApiError::Auth(err)) => {
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if logging.is_enabled() {
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warn!(
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error!(
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self.log,
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"Failed jwt authorization";
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"error" => ?err,
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);
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}
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*state_lock = EngineState::AuthFailed
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let mut state = self.state.write().await;
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*state = EngineState::AuthFailed;
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*state
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}
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Err(e) => {
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if logging.is_enabled() {
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warn!(
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error!(
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self.log,
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"Execution engine offline";
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"Error during execution engine upcheck";
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"error" => ?e,
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)
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}
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}
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}
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}
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);
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if *state_lock != EngineState::Synced && logging.is_enabled() {
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crit!(
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self.log,
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"No synced execution engines";
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)
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let mut state = self.state.write().await;
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*state = EngineState::Offline;
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*state
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}
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}
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/// Run `func` on the node.
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///
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/// This function might try to run `func` twice. If the node returns an error it will try to
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/// upcheck it and then run the function again.
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pub async fn first_success<'a, F, G, H>(&'a self, func: F) -> Result<H, EngineError>
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where
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F: Fn(&'a Engine) -> G + Copy,
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G: Future<Output = Result<H, EngineApiError>>,
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{
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match self.first_success_without_retry(func).await {
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Ok(result) => Ok(result),
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Err(e) => {
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debug!(self.log, "First engine call failed. Retrying"; "err" => ?e);
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// Try to recover the node.
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self.upcheck_not_synced(Logging::Enabled).await;
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// Try again.
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self.first_success_without_retry(func).await
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}
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}
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}
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/// Run `func` on the node.
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pub async fn first_success_without_retry<'a, F, G, H>(
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&'a self,
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func: F,
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) -> Result<H, EngineError>
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where
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F: Fn(&'a Engine) -> G,
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G: Future<Output = Result<H, EngineApiError>>,
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{
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let (engine_synced, engine_auth_failed) = {
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let state = self.state.read().await;
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(
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*state == EngineState::Synced,
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*state == EngineState::AuthFailed,
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)
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};
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if engine_synced {
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match func(self).await {
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Ok(result) => Ok(result),
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Err(error) => {
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debug!(
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self.log,
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"Execution engine call failed";
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"error" => ?error,
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"Execution engine upcheck complete";
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"state" => ?state,
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);
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*self.state.write().await = EngineState::Offline;
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Err(EngineError::Api { error })
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}
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}
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} else if engine_auth_failed {
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Err(EngineError::Auth)
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} else {
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Err(EngineError::Offline)
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}
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}
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/// Runs `func` on the node.
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/// Run `func` on the node regardless of the node's current state.
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///
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/// This function might try to run `func` twice. If all nodes return an error on the first time
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/// it runs, it will try to upcheck all offline nodes and then run the function again.
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pub async fn broadcast<'a, F, G, H>(&'a self, func: F) -> Result<H, EngineError>
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where
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F: Fn(&'a Engine) -> G + Copy,
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G: Future<Output = Result<H, EngineApiError>>,
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{
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match self.broadcast_without_retry(func).await {
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Err(EngineError::Offline { .. }) => {
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self.upcheck_not_synced(Logging::Enabled).await;
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self.broadcast_without_retry(func).await
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}
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other => other,
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}
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}
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/// Runs `func` on the node if it's last state is not offline.
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pub async fn broadcast_without_retry<'a, F, G, H>(&'a self, func: F) -> Result<H, EngineError>
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/// ## Note
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///
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/// This function takes locks on `self.state`, holding a conflicting lock might cause a
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/// deadlock.
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pub async fn request<'a, F, G, H>(self: &'a Arc<Self>, func: F) -> Result<H, EngineError>
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where
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F: Fn(&'a Engine) -> G,
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G: Future<Output = Result<H, EngineApiError>>,
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{
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let func = &func;
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if *self.state.read().await == EngineState::Offline {
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Err(EngineError::Offline)
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} else {
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match func(self).await {
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Ok(res) => Ok(res),
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Ok(result) => {
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// Take a clone *without* holding the read-lock since the `upcheck` function will
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// take a write-lock.
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let state: EngineState = *self.state.read().await;
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// If this request just returned successfully but we don't think this node is
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// synced, check to see if it just became synced. This helps to ensure that the
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// networking stack can get fast feedback about a synced engine.
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if state != EngineState::Synced {
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// Spawn the upcheck in another task to avoid slowing down this request.
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let inner_self = self.clone();
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self.executor.spawn(
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async move { inner_self.upcheck().await },
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"upcheck_after_success",
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);
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}
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Ok(result)
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}
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Err(error) => {
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debug!(
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error!(
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self.log,
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"Execution engine call failed";
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"error" => ?error,
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);
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*self.state.write().await = EngineState::Offline;
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// The node just returned an error, run an upcheck so we can update the endpoint
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// state.
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//
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// Spawn the upcheck in another task to avoid slowing down this request.
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let inner_self = self.clone();
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self.executor.spawn(
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async move { inner_self.upcheck().await },
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"upcheck_after_error",
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);
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Err(EngineError::Api { error })
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}
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}
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}
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}
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}
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impl PayloadIdCacheKey {
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fn new(state: &ForkChoiceState, attributes: &PayloadAttributes) -> Self {
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@ -10,7 +10,7 @@ use engine_api::Error as ApiError;
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pub use engine_api::*;
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pub use engine_api::{http, http::deposit_methods, http::HttpJsonRpc};
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pub use engines::ForkChoiceState;
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use engines::{Engine, EngineError, Logging};
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use engines::{Engine, EngineError};
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use lru::LruCache;
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use payload_status::process_payload_status;
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pub use payload_status::PayloadStatus;
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@ -27,7 +27,7 @@ use std::time::{Duration, SystemTime, UNIX_EPOCH};
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use task_executor::TaskExecutor;
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use tokio::{
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sync::{Mutex, MutexGuard, RwLock},
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time::{sleep, sleep_until, Instant},
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time::sleep,
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};
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use types::{
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BlindedPayload, BlockType, ChainSpec, Epoch, ExecPayload, ExecutionBlockHash,
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@ -101,7 +101,7 @@ pub struct Proposer {
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}
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struct Inner<E: EthSpec> {
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engine: Engine,
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engine: Arc<Engine>,
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builder: Option<BuilderHttpClient>,
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execution_engine_forkchoice_lock: Mutex<()>,
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suggested_fee_recipient: Option<Address>,
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@ -132,22 +132,15 @@ pub struct Config {
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pub default_datadir: PathBuf,
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}
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/// Provides access to one or more execution engines and provides a neat interface for consumption
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/// by the `BeaconChain`.
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///
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/// When there is more than one execution node specified, the others will be used in a "fallback"
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/// fashion. Some requests may be broadcast to all nodes and others might only be sent to the first
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/// node that returns a valid response. Ultimately, the purpose of fallback nodes is to provide
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/// redundancy in the case where one node is offline.
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///
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/// The fallback nodes have an ordering. The first supplied will be the first contacted, and so on.
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/// Provides access to one execution engine and provides a neat interface for consumption by the
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/// `BeaconChain`.
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#[derive(Clone)]
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pub struct ExecutionLayer<T: EthSpec> {
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inner: Arc<Inner<T>>,
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}
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impl<T: EthSpec> ExecutionLayer<T> {
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/// Instantiate `Self` with Execution engines specified using `Config`, all using the JSON-RPC via HTTP.
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/// Instantiate `Self` with an Execution engine specified in `Config`, using JSON-RPC via HTTP.
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pub fn from_config(config: Config, executor: TaskExecutor, log: Logger) -> Result<Self, Error> {
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let Config {
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execution_endpoints: urls,
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@ -202,7 +195,7 @@ impl<T: EthSpec> ExecutionLayer<T> {
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let auth = Auth::new(jwt_key, jwt_id, jwt_version);
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debug!(log, "Loaded execution endpoint"; "endpoint" => %execution_url, "jwt_path" => ?secret_file.as_path());
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let api = HttpJsonRpc::new_with_auth(execution_url, auth).map_err(Error::ApiError)?;
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Engine::new(api, &log)
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Engine::new(api, executor.clone(), &log)
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};
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let builder = builder_url
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@ -210,7 +203,7 @@ impl<T: EthSpec> ExecutionLayer<T> {
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.transpose()?;
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let inner = Inner {
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engine,
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engine: Arc::new(engine),
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builder,
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execution_engine_forkchoice_lock: <_>::default(),
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suggested_fee_recipient,
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@ -229,7 +222,7 @@ impl<T: EthSpec> ExecutionLayer<T> {
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}
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impl<T: EthSpec> ExecutionLayer<T> {
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fn engines(&self) -> &Engine {
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fn engine(&self) -> &Arc<Engine> {
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&self.inner.engine
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}
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@ -276,54 +269,18 @@ impl<T: EthSpec> ExecutionLayer<T> {
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self.executor().spawn(generate_future(self.clone()), name);
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}
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/// Spawns a routine which attempts to keep the execution engines online.
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/// Spawns a routine which attempts to keep the execution engine online.
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pub fn spawn_watchdog_routine<S: SlotClock + 'static>(&self, slot_clock: S) {
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let watchdog = |el: ExecutionLayer<T>| async move {
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// Run one task immediately.
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el.watchdog_task().await;
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let recurring_task =
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|el: ExecutionLayer<T>, now: Instant, duration_to_next_slot: Duration| async move {
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// We run the task three times per slot.
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//
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// The interval between each task is 1/3rd of the slot duration. This matches nicely
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// with the attestation production times (unagg. at 1/3rd, agg at 2/3rd).
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//
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// Each task is offset by 3/4ths of the interval.
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//
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// On mainnet, this means we will run tasks at:
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//
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// - 3s after slot start: 1s before publishing unaggregated attestations.
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// - 7s after slot start: 1s before publishing aggregated attestations.
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// - 11s after slot start: 1s before the next slot starts.
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let interval = duration_to_next_slot / 3;
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let offset = (interval / 4) * 3;
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let first_execution = duration_to_next_slot + offset;
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let second_execution = first_execution + interval;
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let third_execution = second_execution + interval;
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|
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sleep_until(now + first_execution).await;
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el.engines().upcheck_not_synced(Logging::Disabled).await;
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sleep_until(now + second_execution).await;
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el.engines().upcheck_not_synced(Logging::Disabled).await;
|
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|
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sleep_until(now + third_execution).await;
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el.engines().upcheck_not_synced(Logging::Disabled).await;
|
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};
|
||||
|
||||
// Start the loop to periodically update.
|
||||
loop {
|
||||
if let Some(duration) = slot_clock.duration_to_next_slot() {
|
||||
let now = Instant::now();
|
||||
|
||||
// Spawn a new task rather than waiting for this to finish. This ensure that a
|
||||
// slow run doesn't prevent the next run from starting.
|
||||
el.spawn(|el| recurring_task(el, now, duration), "exec_watchdog_task");
|
||||
} else {
|
||||
error!(el.log(), "Failed to spawn watchdog task");
|
||||
}
|
||||
el.spawn(
|
||||
|el| async move { el.watchdog_task().await },
|
||||
"exec_watchdog_task",
|
||||
);
|
||||
sleep(slot_clock.slot_duration()).await;
|
||||
}
|
||||
};
|
||||
@ -333,8 +290,7 @@ impl<T: EthSpec> ExecutionLayer<T> {
|
||||
|
||||
/// Performs a single execution of the watchdog routine.
|
||||
pub async fn watchdog_task(&self) {
|
||||
// Disable logging since this runs frequently and may get annoying.
|
||||
self.engines().upcheck_not_synced(Logging::Disabled).await;
|
||||
self.engine().upcheck().await;
|
||||
}
|
||||
|
||||
/// Spawns a routine which cleans the cached proposer data periodically.
|
||||
@ -394,9 +350,9 @@ impl<T: EthSpec> ExecutionLayer<T> {
|
||||
self.spawn(routine, "exec_config_poll");
|
||||
}
|
||||
|
||||
/// Returns `true` if there is at least one synced and reachable engine.
|
||||
/// Returns `true` if the execution engine is synced and reachable.
|
||||
pub async fn is_synced(&self) -> bool {
|
||||
self.engines().is_synced().await
|
||||
self.engine().is_synced().await
|
||||
}
|
||||
|
||||
/// Updates the proposer preparation data provided by validators
|
||||
@ -632,8 +588,8 @@ impl<T: EthSpec> ExecutionLayer<T> {
|
||||
"timestamp" => timestamp,
|
||||
"parent_hash" => ?parent_hash,
|
||||
);
|
||||
self.engines()
|
||||
.first_success(|engine| async move {
|
||||
self.engine()
|
||||
.request(|engine| async move {
|
||||
let payload_id = if let Some(id) = engine
|
||||
.get_payload_id(parent_hash, timestamp, prev_randao, suggested_fee_recipient)
|
||||
.await
|
||||
@ -736,12 +692,12 @@ impl<T: EthSpec> ExecutionLayer<T> {
|
||||
"block_number" => execution_payload.block_number,
|
||||
);
|
||||
|
||||
let broadcast_result = self
|
||||
.engines()
|
||||
.broadcast(|engine| engine.api.new_payload_v1(execution_payload.clone()))
|
||||
let result = self
|
||||
.engine()
|
||||
.request(|engine| engine.api.new_payload_v1(execution_payload.clone()))
|
||||
.await;
|
||||
|
||||
process_payload_status(execution_payload.block_hash, broadcast_result, self.log())
|
||||
process_payload_status(execution_payload.block_hash, result, self.log())
|
||||
.map_err(Box::new)
|
||||
.map_err(Error::EngineError)
|
||||
}
|
||||
@ -867,13 +823,13 @@ impl<T: EthSpec> ExecutionLayer<T> {
|
||||
finalized_block_hash,
|
||||
};
|
||||
|
||||
self.engines()
|
||||
self.engine()
|
||||
.set_latest_forkchoice_state(forkchoice_state)
|
||||
.await;
|
||||
|
||||
let broadcast_result = self
|
||||
.engines()
|
||||
.broadcast(|engine| async move {
|
||||
let result = self
|
||||
.engine()
|
||||
.request(|engine| async move {
|
||||
engine
|
||||
.notify_forkchoice_updated(forkchoice_state, payload_attributes, self.log())
|
||||
.await
|
||||
@ -882,7 +838,7 @@ impl<T: EthSpec> ExecutionLayer<T> {
|
||||
|
||||
process_payload_status(
|
||||
head_block_hash,
|
||||
broadcast_result.map(|response| response.payload_status),
|
||||
result.map(|response| response.payload_status),
|
||||
self.log(),
|
||||
)
|
||||
.map_err(Box::new)
|
||||
@ -896,12 +852,12 @@ impl<T: EthSpec> ExecutionLayer<T> {
|
||||
terminal_block_number: 0,
|
||||
};
|
||||
|
||||
let broadcast_result = self
|
||||
.engines()
|
||||
.broadcast(|engine| engine.api.exchange_transition_configuration_v1(local))
|
||||
let result = self
|
||||
.engine()
|
||||
.request(|engine| engine.api.exchange_transition_configuration_v1(local))
|
||||
.await;
|
||||
|
||||
match broadcast_result {
|
||||
match result {
|
||||
Ok(remote) => {
|
||||
if local.terminal_total_difficulty != remote.terminal_total_difficulty
|
||||
|| local.terminal_block_hash != remote.terminal_block_hash
|
||||
@ -953,8 +909,8 @@ impl<T: EthSpec> ExecutionLayer<T> {
|
||||
);
|
||||
|
||||
let hash_opt = self
|
||||
.engines()
|
||||
.first_success(|engine| async move {
|
||||
.engine()
|
||||
.request(|engine| async move {
|
||||
let terminal_block_hash = spec.terminal_block_hash;
|
||||
if terminal_block_hash != ExecutionBlockHash::zero() {
|
||||
if self
|
||||
@ -1040,8 +996,8 @@ impl<T: EthSpec> ExecutionLayer<T> {
|
||||
/// - `Some(true)` if the given `block_hash` is the terminal proof-of-work block.
|
||||
/// - `Some(false)` if the given `block_hash` is certainly *not* the terminal proof-of-work
|
||||
/// block.
|
||||
/// - `None` if the `block_hash` or its parent were not present on the execution engines.
|
||||
/// - `Err(_)` if there was an error connecting to the execution engines.
|
||||
/// - `None` if the `block_hash` or its parent were not present on the execution engine.
|
||||
/// - `Err(_)` if there was an error connecting to the execution engine.
|
||||
///
|
||||
/// ## Fallback Behaviour
|
||||
///
|
||||
@ -1069,8 +1025,8 @@ impl<T: EthSpec> ExecutionLayer<T> {
|
||||
&[metrics::IS_VALID_TERMINAL_POW_BLOCK_HASH],
|
||||
);
|
||||
|
||||
self.engines()
|
||||
.broadcast(|engine| async move {
|
||||
self.engine()
|
||||
.request(|engine| async move {
|
||||
if let Some(pow_block) = self.get_pow_block(engine, block_hash).await? {
|
||||
if let Some(pow_parent) =
|
||||
self.get_pow_block(engine, pow_block.parent_hash).await?
|
||||
@ -1136,8 +1092,8 @@ impl<T: EthSpec> ExecutionLayer<T> {
|
||||
&self,
|
||||
hash: ExecutionBlockHash,
|
||||
) -> Result<Option<ExecutionPayload<T>>, Error> {
|
||||
self.engines()
|
||||
.first_success(|engine| async move {
|
||||
self.engine()
|
||||
.request(|engine| async move {
|
||||
self.get_payload_by_block_hash_from_engine(engine, hash)
|
||||
.await
|
||||
})
|
||||
@ -1240,7 +1196,7 @@ mod test {
|
||||
MockExecutionLayer::default_params(runtime.task_executor.clone())
|
||||
.move_to_block_prior_to_terminal_block()
|
||||
.with_terminal_block(|spec, el, _| async move {
|
||||
el.engines().upcheck_not_synced(Logging::Disabled).await;
|
||||
el.engine().upcheck().await;
|
||||
assert_eq!(el.get_terminal_pow_block_hash(&spec).await.unwrap(), None)
|
||||
})
|
||||
.await
|
||||
@ -1260,7 +1216,7 @@ mod test {
|
||||
MockExecutionLayer::default_params(runtime.task_executor.clone())
|
||||
.move_to_terminal_block()
|
||||
.with_terminal_block(|spec, el, terminal_block| async move {
|
||||
el.engines().upcheck_not_synced(Logging::Disabled).await;
|
||||
el.engine().upcheck().await;
|
||||
assert_eq!(
|
||||
el.is_valid_terminal_pow_block_hash(terminal_block.unwrap().block_hash, &spec)
|
||||
.await
|
||||
@ -1277,7 +1233,7 @@ mod test {
|
||||
MockExecutionLayer::default_params(runtime.task_executor.clone())
|
||||
.move_to_terminal_block()
|
||||
.with_terminal_block(|spec, el, terminal_block| async move {
|
||||
el.engines().upcheck_not_synced(Logging::Disabled).await;
|
||||
el.engine().upcheck().await;
|
||||
let invalid_terminal_block = terminal_block.unwrap().parent_hash;
|
||||
|
||||
assert_eq!(
|
||||
@ -1296,7 +1252,7 @@ mod test {
|
||||
MockExecutionLayer::default_params(runtime.task_executor.clone())
|
||||
.move_to_terminal_block()
|
||||
.with_terminal_block(|spec, el, _| async move {
|
||||
el.engines().upcheck_not_synced(Logging::Disabled).await;
|
||||
el.engine().upcheck().await;
|
||||
let missing_terminal_block = ExecutionBlockHash::repeat_byte(42);
|
||||
|
||||
assert_eq!(
|
||||
|
||||
Loading…
Reference in New Issue
Block a user