mirror of
https://github.com/sigp/lighthouse.git
synced 2026-03-11 18:04:18 +00:00
Sync Re-Write (#663)
* Apply clippy lints to beacon node * Remove unnecessary logging and correct formatting * Initial bones of load-balanced range-sync * Port bump meshsup tests * Further structure and network handling logic added * Basic structure, ignoring error handling * Correct max peers delay bug * Clean up and re-write message processor and sync manager * Restructure directory, correct type issues * Fix compiler issues * Completed first testing of new sync * Correct merge issues * Clean up warnings * Push attestation processed log down to dbg * Correct math error, downgraded logs * Add RPC error handling and improved syncing code * Add libp2p stream error handling and dropping of invalid peers * Lower logs * Add discovery tweak * Correct libp2p service locking * Handles peer disconnects for sync * Add logs downgrade discovery log * Less fork choice (#679) * Try merge in change to reduce fork choice calls * Remove fork choice from process block * Minor log fix * Check successes > 0 * Fix failing beacon chain tests * Fix re-org warnings * Fix mistake in prev commit * Range sync refactor - Introduces `ChainCollection` - Correct Disconnect node handling - Removes duplicate code * Various bug fixes * Remove unnecessary logs * Maintain syncing state in the transition from finalied to head * Improved disconnect handling * Adds forwards block interator * Notifies lighthouse on stream timeouts * Apply new gossipsub updates
This commit is contained in:
649
beacon_node/network/src/sync/range_sync/chain.rs
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649
beacon_node/network/src/sync/range_sync/chain.rs
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@@ -0,0 +1,649 @@
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use crate::sync::message_processor::FUTURE_SLOT_TOLERANCE;
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use crate::sync::network_context::SyncNetworkContext;
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use beacon_chain::{BeaconChain, BeaconChainTypes, BlockProcessingOutcome};
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use eth2_libp2p::rpc::methods::*;
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use eth2_libp2p::rpc::RequestId;
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use eth2_libp2p::PeerId;
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use fnv::FnvHashMap;
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use slog::{crit, debug, error, trace, warn, Logger};
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use std::cmp::Ordering;
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use std::collections::HashSet;
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use std::ops::Sub;
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use std::sync::Weak;
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use types::{BeaconBlock, EthSpec, Hash256, Slot};
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/// Blocks are downloaded in batches from peers. This constant specifies how many blocks per batch
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/// is requested. There is a timeout for each batch request. If this value is too high, we will
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/// downvote peers with poor bandwidth. This can be set arbitrarily high, in which case the
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/// responder will fill the response up to the max request size, assuming they have the bandwidth
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/// to do so.
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//TODO: Make this dynamic based on peer's bandwidth
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const BLOCKS_PER_BATCH: u64 = 50;
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/// The number of times to retry a batch before the chain is considered failed and removed.
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const MAX_BATCH_RETRIES: u8 = 5;
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#[derive(PartialEq)]
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pub struct Batch<T: EthSpec> {
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/// The ID of the batch, batches are ID's sequentially.
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id: u64,
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/// The requested start slot of the batch, inclusive.
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start_slot: Slot,
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/// The requested end slot of batch, exclusive.
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end_slot: Slot,
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/// The hash of the chain root to requested from the peer.
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head_root: Hash256,
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/// The peer that was originally assigned to the batch.
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_original_peer: PeerId,
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/// The peer that is currently assigned to the batch.
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pub current_peer: PeerId,
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/// The number of retries this batch has undergone.
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retries: u8,
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/// The blocks that have been downloaded.
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downloaded_blocks: Vec<BeaconBlock<T>>,
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}
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impl<T: EthSpec> Ord for Batch<T> {
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fn cmp(&self, other: &Self) -> Ordering {
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self.id.cmp(&other.id)
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}
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}
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impl<T: EthSpec> PartialOrd for Batch<T> {
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fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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Some(self.cmp(other))
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}
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}
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pub enum ProcessingResult {
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KeepChain,
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RemoveChain,
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}
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impl<T: EthSpec> Eq for Batch<T> {}
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impl<T: EthSpec> Batch<T> {
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fn new(id: u64, start_slot: Slot, end_slot: Slot, head_root: Hash256, peer_id: PeerId) -> Self {
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Batch {
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id,
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start_slot,
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end_slot,
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head_root,
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_original_peer: peer_id.clone(),
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current_peer: peer_id,
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retries: 0,
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downloaded_blocks: Vec::new(),
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}
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}
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fn to_blocks_by_range_request(&self) -> BlocksByRangeRequest {
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BlocksByRangeRequest {
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head_block_root: self.head_root,
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start_slot: self.start_slot.into(),
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count: std::cmp::min(BLOCKS_PER_BATCH, self.end_slot.sub(self.start_slot).into()),
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step: 1,
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}
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}
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}
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pub struct SyncingChain<T: BeaconChainTypes> {
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/// The original start slot when this chain was initialised.
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pub start_slot: Slot,
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/// The target head slot.
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pub target_head_slot: Slot,
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/// The target head root.
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pub target_head_root: Hash256,
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/// The batches that are currently awaiting a response from a peer. An RPC request for these
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/// have been sent.
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pub pending_batches: FnvHashMap<RequestId, Batch<T::EthSpec>>,
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/// The batches that have been downloaded and are awaiting processing and/or validation.
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completed_batches: Vec<Batch<T::EthSpec>>,
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/// The peers that agree on the `target_head_slot` and `target_head_root` as a canonical chain
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/// and thus available to download this chain from.
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pub peer_pool: HashSet<PeerId>,
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/// The next batch_id that needs to be downloaded.
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to_be_downloaded_id: u64,
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/// The next batch id that needs to be processed.
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to_be_processed_id: u64,
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/// The last batch id that was processed.
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last_processed_id: u64,
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/// The current state of the chain.
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pub state: ChainSyncingState,
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}
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#[derive(PartialEq)]
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pub enum ChainSyncingState {
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/// The chain is not being synced.
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Stopped,
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/// The chain is undergoing syncing.
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Syncing,
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/// The chain is temporarily paused whilst an error is rectified.
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Paused,
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}
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impl<T: BeaconChainTypes> SyncingChain<T> {
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pub fn new(
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start_slot: Slot,
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target_head_slot: Slot,
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target_head_root: Hash256,
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peer_id: PeerId,
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) -> Self {
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let mut peer_pool = HashSet::new();
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peer_pool.insert(peer_id);
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SyncingChain {
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start_slot,
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target_head_slot,
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target_head_root,
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pending_batches: FnvHashMap::default(),
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completed_batches: Vec::new(),
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peer_pool,
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to_be_downloaded_id: 1,
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to_be_processed_id: 1,
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last_processed_id: 0,
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state: ChainSyncingState::Stopped,
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}
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}
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pub fn on_block_response(
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&mut self,
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chain: &Weak<BeaconChain<T>>,
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network: &mut SyncNetworkContext,
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request_id: RequestId,
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beacon_block: &Option<BeaconBlock<T::EthSpec>>,
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log: &slog::Logger,
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) -> Option<ProcessingResult> {
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if let Some(block) = beacon_block {
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let batch = self.pending_batches.get_mut(&request_id)?;
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// This is not a stream termination, simply add the block to the request
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batch.downloaded_blocks.push(block.clone());
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return Some(ProcessingResult::KeepChain);
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} else {
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// A stream termination has been sent. This batch has ended. Process a completed batch.
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let batch = self.pending_batches.remove(&request_id)?;
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Some(self.process_completed_batch(chain.clone(), network, batch, log))
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}
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}
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fn process_completed_batch(
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&mut self,
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chain: Weak<BeaconChain<T>>,
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network: &mut SyncNetworkContext,
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batch: Batch<T::EthSpec>,
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log: &slog::Logger,
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) -> ProcessingResult {
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// An entire batch of blocks has been received. This functions checks to see if it can be processed,
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// remove any batches waiting to be verified and if this chain is syncing, request new
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// blocks for the peer.
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debug!(log, "Completed batch received"; "id"=>batch.id, "blocks"=>batch.downloaded_blocks.len(), "awaiting_batches" => self.completed_batches.len());
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// The peer that completed this batch, may be re-requested if this batch doesn't complete
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// the chain and there is no error in processing
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let current_peer = batch.current_peer.clone();
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// verify the range of received blocks
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// Note that the order of blocks is verified in block processing
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if let Some(last_slot) = batch.downloaded_blocks.last().map(|b| b.slot) {
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// the batch is non-empty
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if batch.start_slot > batch.downloaded_blocks[0].slot || batch.end_slot < last_slot {
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warn!(log, "BlocksByRange response returned out of range blocks";
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"response_initial_slot" => batch.downloaded_blocks[0].slot,
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"requested_initial_slot" => batch.start_slot);
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network.downvote_peer(batch.current_peer);
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self.to_be_processed_id = batch.id; // reset the id back to here, when incrementing, it will check against completed batches
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return ProcessingResult::KeepChain;
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}
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}
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// Add this completed batch to the list of completed batches. This list will then need to
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// be checked if any batches can be processed and verified for errors or invalid responses
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// from peers. The logic is simpler to create this ordered batch list and to then process
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// the list.
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let insert_index = self
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.completed_batches
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.binary_search(&batch)
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.unwrap_or_else(|index| index);
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self.completed_batches.insert(insert_index, batch);
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// We have a list of completed batches. It is not sufficient to process batch successfully
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// to consider the batch correct. This is because batches could be erroneously empty, or
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// incomplete. Therefore, a batch is considered valid, only if the next sequential batch is
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// processed successfully. Therefore the `completed_batches` will store batches that have
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// already be processed but not verified and therefore have Id's less than
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// `self.to_be_processed_id`.
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//TODO: Run the processing of blocks in a separate thread. Build a queue of completed
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//blocks here, manage the queue and process them in another thread as they become
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//available.
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if self.state != ChainSyncingState::Paused {
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// pre-emptively request more blocks from peers whilst we process current blocks,
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self.send_range_request(network, current_peer);
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// Try and process batches sequentially in the ordered list.
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let current_process_id = self.to_be_processed_id;
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for batch in self
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.completed_batches
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.iter()
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.filter(|batch| batch.id >= current_process_id)
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{
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if batch.id == self.to_be_processed_id {
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if batch.downloaded_blocks.is_empty() {
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// the batch was empty, progress to the next block
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self.to_be_processed_id += 1;
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continue;
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} else {
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let mut successes = 0;
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debug!(log, "Processing batch"; "batch_id" => batch.id);
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match process_batch(chain.clone(), batch, &mut successes, log) {
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Ok(_) => {
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// batch was successfully processed
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self.last_processed_id = self.to_be_processed_id;
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self.to_be_processed_id += 1;
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if let Some(chain) = chain.upgrade() {
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match chain.fork_choice() {
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Ok(()) => trace!(
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log,
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"Fork choice success";
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"location" => "batch import success"
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),
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Err(e) => error!(
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log,
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"Fork choice failed";
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"error" => format!("{:?}", e),
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"location" => "batch import success"
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),
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}
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}
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}
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Err(e) => {
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warn!(log, "Block processing error"; "error"=> format!("{:?}", e));
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if successes > 0 {
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if let Some(chain) = chain.upgrade() {
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match chain.fork_choice() {
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Ok(()) => trace!(
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log,
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"Fork choice success";
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"block_imports" => successes,
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"location" => "batch import error"
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),
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Err(e) => error!(
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log,
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"Fork choice failed";
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"error" => format!("{:?}", e),
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"location" => "batch import error"
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),
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}
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}
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}
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// batch processing failed
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// this could be because this batch is invalid, or a previous invalidated batch
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// is invalid. We need to find out which and downvote the peer that has sent us
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// an invalid batch.
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// firstly remove any validated batches
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return self.handle_invalid_batch(chain, network);
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}
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}
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}
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} else {
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// there are no more batches to be processed, end
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break;
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}
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}
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// remove any validated batches
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let last_processed_id = self.last_processed_id;
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self.completed_batches
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.retain(|batch| batch.id >= last_processed_id);
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// check if the chain has completed syncing, if not, request another batch from this peer
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if self.start_slot + self.last_processed_id * BLOCKS_PER_BATCH >= self.target_head_slot
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{
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// chain is completed
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ProcessingResult::RemoveChain
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} else {
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// chain is not completed
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ProcessingResult::KeepChain
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}
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} else {
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ProcessingResult::KeepChain
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}
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}
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fn handle_invalid_batch(
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&mut self,
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_chain: Weak<BeaconChain<T>>,
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network: &mut SyncNetworkContext,
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) -> ProcessingResult {
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// The current batch could not be processed, indicating either the current or previous
|
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// batches are invalid
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// The previous batch could be
|
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// incomplete due to the block sizes being too large to fit in a single RPC
|
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// request or there could be consecutive empty batches which are not supposed to be there
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// Address these two cases individually.
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// Firstly, check if the past batch is invalid.
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//
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//TODO: Implement this logic
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// Currently just fail the chain, and drop all associated peers
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for peer_id in self.peer_pool.iter() {
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network.downvote_peer(peer_id.clone());
|
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}
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ProcessingResult::RemoveChain
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}
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pub fn stop_syncing(&mut self) {
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self.state = ChainSyncingState::Stopped;
|
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}
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// Either a new chain, or an old one with a peer list
|
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pub fn start_syncing(
|
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&mut self,
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network: &mut SyncNetworkContext,
|
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local_finalized_slot: Slot,
|
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log: &slog::Logger,
|
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) {
|
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// A local finalized slot is provided as other chains may have made
|
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// progress whilst this chain was Stopped or paused. If so, update the `processed_batch_id` to
|
||||
// accommodate potentially downloaded batches from other chains. Also prune any old batches
|
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// awaiting processing
|
||||
|
||||
// Only important if the local head is more than a batch worth of blocks ahead of
|
||||
// what this chain believes is downloaded
|
||||
let batches_ahead = local_finalized_slot
|
||||
.as_u64()
|
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.saturating_sub(self.start_slot.as_u64() + self.last_processed_id * BLOCKS_PER_BATCH)
|
||||
/ BLOCKS_PER_BATCH;
|
||||
|
||||
if batches_ahead != 0 {
|
||||
// there are `batches_ahead` whole batches that have been downloaded by another
|
||||
// chain. Set the current processed_batch_id to this value.
|
||||
debug!(log, "Updating chains processed batches"; "old_completed_slot" => self.start_slot + self.last_processed_id*BLOCKS_PER_BATCH, "new_completed_slot" => self.start_slot + (self.last_processed_id + batches_ahead)*BLOCKS_PER_BATCH);
|
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self.last_processed_id += batches_ahead;
|
||||
|
||||
if self.start_slot + self.last_processed_id * BLOCKS_PER_BATCH
|
||||
> self.target_head_slot.as_u64()
|
||||
{
|
||||
crit!(
|
||||
log,
|
||||
"Current head slot is above the target head";
|
||||
"target_head_slot" => self.target_head_slot.as_u64(),
|
||||
"new_start" => self.start_slot + self.last_processed_id * BLOCKS_PER_BATCH,
|
||||
);
|
||||
return;
|
||||
}
|
||||
|
||||
// update the `to_be_downloaded_id`
|
||||
if self.to_be_downloaded_id < self.last_processed_id {
|
||||
self.to_be_downloaded_id = self.last_processed_id;
|
||||
}
|
||||
|
||||
let last_processed_id = self.last_processed_id;
|
||||
self.completed_batches
|
||||
.retain(|batch| batch.id >= last_processed_id.saturating_sub(1));
|
||||
}
|
||||
|
||||
// Now begin requesting blocks from the peer pool. Ignore any peers with currently
|
||||
// pending requests
|
||||
let pending_peers = self
|
||||
.pending_batches
|
||||
.values()
|
||||
.map(|batch| batch.current_peer.clone())
|
||||
.collect::<Vec<_>>();
|
||||
|
||||
let peers = self
|
||||
.peer_pool
|
||||
.iter()
|
||||
.filter(|peer| !pending_peers.contains(peer))
|
||||
.cloned()
|
||||
.collect::<Vec<_>>();
|
||||
|
||||
for peer_id in peers {
|
||||
// send a blocks by range request to the peer
|
||||
self.send_range_request(network, peer_id);
|
||||
}
|
||||
|
||||
self.state = ChainSyncingState::Syncing;
|
||||
}
|
||||
|
||||
// A peer has been added, start batch requests for this peer
|
||||
// this should only be called for a syncing chain
|
||||
pub fn peer_added(
|
||||
&mut self,
|
||||
network: &mut SyncNetworkContext,
|
||||
peer_id: PeerId,
|
||||
log: &slog::Logger,
|
||||
) {
|
||||
// do not request blocks if the chain is not syncing
|
||||
if let ChainSyncingState::Stopped = self.state {
|
||||
debug!(log, "Peer added to a non-syncing chain"; "peer_id" => format!("{:?}", peer_id));
|
||||
return;
|
||||
}
|
||||
|
||||
// find the next batch and request it from the peer
|
||||
self.send_range_request(network, peer_id);
|
||||
}
|
||||
|
||||
// Re-STATUS all the peers in this chain
|
||||
pub fn status_peers(&self, chain: Weak<BeaconChain<T>>, network: &mut SyncNetworkContext) {
|
||||
for peer_id in self.peer_pool.iter() {
|
||||
network.status_peer(chain.clone(), peer_id.clone());
|
||||
}
|
||||
}
|
||||
|
||||
fn send_range_request(&mut self, network: &mut SyncNetworkContext, peer_id: PeerId) {
|
||||
// find the next pending batch and request it from the peer
|
||||
if let Some(batch) = self.get_next_batch(peer_id) {
|
||||
// send the batch
|
||||
self.send_batch(network, batch);
|
||||
}
|
||||
}
|
||||
|
||||
fn send_batch(&mut self, network: &mut SyncNetworkContext, batch: Batch<T::EthSpec>) {
|
||||
let request = batch.to_blocks_by_range_request();
|
||||
if let Ok(request_id) = network.blocks_by_range_request(batch.current_peer.clone(), request)
|
||||
{
|
||||
// add the batch to pending list
|
||||
self.pending_batches.insert(request_id, batch);
|
||||
}
|
||||
}
|
||||
|
||||
fn get_next_batch(&mut self, peer_id: PeerId) -> Option<Batch<T::EthSpec>> {
|
||||
let batch_start_slot =
|
||||
self.start_slot + self.to_be_downloaded_id.saturating_sub(1) * BLOCKS_PER_BATCH;
|
||||
if batch_start_slot > self.target_head_slot {
|
||||
return None;
|
||||
}
|
||||
let batch_end_slot = std::cmp::min(
|
||||
batch_start_slot + BLOCKS_PER_BATCH,
|
||||
self.target_head_slot.saturating_add(1u64),
|
||||
);
|
||||
|
||||
let batch_id = self.to_be_downloaded_id;
|
||||
// find the next batch id. The largest of the next sequential idea, of the next uncompleted
|
||||
// id
|
||||
let max_completed_id =
|
||||
self.completed_batches
|
||||
.iter()
|
||||
.fold(0, |max, batch| if batch.id > max { batch.id } else { max });
|
||||
self.to_be_downloaded_id =
|
||||
std::cmp::max(self.to_be_downloaded_id + 1, max_completed_id + 1);
|
||||
|
||||
Some(Batch::new(
|
||||
batch_id,
|
||||
batch_start_slot,
|
||||
batch_end_slot,
|
||||
self.target_head_root,
|
||||
peer_id,
|
||||
))
|
||||
}
|
||||
|
||||
// Checks if the request_id is associated with this chain. If so, attempts to re-request the
|
||||
// batch. If the batch has exceeded the number of retries, returns Some(true), indicating
|
||||
// the chain should be dropped.
|
||||
pub fn inject_error(
|
||||
&mut self,
|
||||
network: &mut SyncNetworkContext,
|
||||
peer_id: &PeerId,
|
||||
request_id: &RequestId,
|
||||
log: &slog::Logger,
|
||||
) -> Option<ProcessingResult> {
|
||||
if let Some(batch) = self.pending_batches.remove(&request_id) {
|
||||
warn!(log, "Batch failed. RPC Error"; "id" => batch.id, "retries" => batch.retries, "peer" => format!("{:?}", peer_id));
|
||||
|
||||
Some(self.failed_batch(network, batch))
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
pub fn failed_batch(
|
||||
&mut self,
|
||||
network: &mut SyncNetworkContext,
|
||||
mut batch: Batch<T::EthSpec>,
|
||||
) -> ProcessingResult {
|
||||
batch.retries += 1;
|
||||
|
||||
if batch.retries > MAX_BATCH_RETRIES {
|
||||
// chain is unrecoverable, remove it
|
||||
ProcessingResult::RemoveChain
|
||||
} else {
|
||||
// try to re-process the request using a different peer, if possible
|
||||
let current_peer = &batch.current_peer;
|
||||
let new_peer = self
|
||||
.peer_pool
|
||||
.iter()
|
||||
.find(|peer| *peer != current_peer)
|
||||
.unwrap_or_else(|| current_peer);
|
||||
|
||||
batch.current_peer = new_peer.clone();
|
||||
self.send_batch(network, batch);
|
||||
ProcessingResult::KeepChain
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Helper function to process block batches which only consumes the chain and blocks to process
|
||||
fn process_batch<T: BeaconChainTypes>(
|
||||
chain: Weak<BeaconChain<T>>,
|
||||
batch: &Batch<T::EthSpec>,
|
||||
successes: &mut usize,
|
||||
log: &Logger,
|
||||
) -> Result<(), String> {
|
||||
for block in &batch.downloaded_blocks {
|
||||
if let Some(chain) = chain.upgrade() {
|
||||
let processing_result = chain.process_block(block.clone());
|
||||
|
||||
if let Ok(outcome) = processing_result {
|
||||
match outcome {
|
||||
BlockProcessingOutcome::Processed { block_root } => {
|
||||
// The block was valid and we processed it successfully.
|
||||
trace!(
|
||||
log, "Imported block from network";
|
||||
"slot" => block.slot,
|
||||
"block_root" => format!("{}", block_root),
|
||||
);
|
||||
|
||||
*successes += 1
|
||||
}
|
||||
BlockProcessingOutcome::ParentUnknown { parent } => {
|
||||
// blocks should be sequential and all parents should exist
|
||||
trace!(
|
||||
log, "Parent block is unknown";
|
||||
"parent_root" => format!("{}", parent),
|
||||
"baby_block_slot" => block.slot,
|
||||
);
|
||||
return Err(format!(
|
||||
"Block at slot {} has an unknown parent.",
|
||||
block.slot
|
||||
));
|
||||
}
|
||||
BlockProcessingOutcome::BlockIsAlreadyKnown => {
|
||||
// this block is already known to us, move to the next
|
||||
debug!(
|
||||
log, "Imported a block that is already known";
|
||||
"block_slot" => block.slot,
|
||||
);
|
||||
}
|
||||
BlockProcessingOutcome::FutureSlot {
|
||||
present_slot,
|
||||
block_slot,
|
||||
} => {
|
||||
if present_slot + FUTURE_SLOT_TOLERANCE >= block_slot {
|
||||
// The block is too far in the future, drop it.
|
||||
trace!(
|
||||
log, "Block is ahead of our slot clock";
|
||||
"msg" => "block for future slot rejected, check your time",
|
||||
"present_slot" => present_slot,
|
||||
"block_slot" => block_slot,
|
||||
"FUTURE_SLOT_TOLERANCE" => FUTURE_SLOT_TOLERANCE,
|
||||
);
|
||||
return Err(format!(
|
||||
"Block at slot {} is too far in the future",
|
||||
block.slot
|
||||
));
|
||||
} else {
|
||||
// The block is in the future, but not too far.
|
||||
trace!(
|
||||
log, "Block is slightly ahead of our slot clock, ignoring.";
|
||||
"present_slot" => present_slot,
|
||||
"block_slot" => block_slot,
|
||||
"FUTURE_SLOT_TOLERANCE" => FUTURE_SLOT_TOLERANCE,
|
||||
);
|
||||
}
|
||||
}
|
||||
BlockProcessingOutcome::WouldRevertFinalizedSlot { .. } => {
|
||||
trace!(
|
||||
log, "Finalized or earlier block processed";
|
||||
"outcome" => format!("{:?}", outcome),
|
||||
);
|
||||
// block reached our finalized slot or was earlier, move to the next block
|
||||
}
|
||||
BlockProcessingOutcome::GenesisBlock => {
|
||||
trace!(
|
||||
log, "Genesis block was processed";
|
||||
"outcome" => format!("{:?}", outcome),
|
||||
);
|
||||
}
|
||||
_ => {
|
||||
warn!(
|
||||
log, "Invalid block received";
|
||||
"msg" => "peer sent invalid block",
|
||||
"outcome" => format!("{:?}", outcome),
|
||||
);
|
||||
return Err(format!("Invalid block at slot {}", block.slot));
|
||||
}
|
||||
}
|
||||
} else {
|
||||
warn!(
|
||||
log, "BlockProcessingFailure";
|
||||
"msg" => "unexpected condition in processing block.",
|
||||
"outcome" => format!("{:?}", processing_result)
|
||||
);
|
||||
return Err(format!(
|
||||
"Unexpected block processing error: {:?}",
|
||||
processing_result
|
||||
));
|
||||
}
|
||||
} else {
|
||||
return Ok(()); // terminate early due to dropped beacon chain
|
||||
}
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
Reference in New Issue
Block a user