735 lines
26 KiB
Go
735 lines
26 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package fetcher contains the block announcement based synchronisation.
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package fetcher
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import (
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"errors"
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"math/rand"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/prque"
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"github.com/ethereum/go-ethereum/consensus"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/log"
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)
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const (
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arriveTimeout = 500 * time.Millisecond // Time allowance before an announced block is explicitly requested
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gatherSlack = 100 * time.Millisecond // Interval used to collate almost-expired announces with fetches
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fetchTimeout = 5 * time.Second // Maximum allotted time to return an explicitly requested block
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maxUncleDist = 7 // Maximum allowed backward distance from the chain head
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maxQueueDist = 32 // Maximum allowed distance from the chain head to queue
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hashLimit = 256 // Maximum number of unique blocks a peer may have announced
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blockLimit = 64 // Maximum number of unique blocks a peer may have delivered
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)
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var (
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errTerminated = errors.New("terminated")
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)
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// blockRetrievalFn is a callback type for retrieving a block from the local chain.
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type blockRetrievalFn func(common.Hash) *types.Block
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// headerRequesterFn is a callback type for sending a header retrieval request.
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type headerRequesterFn func(common.Hash) error
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// bodyRequesterFn is a callback type for sending a body retrieval request.
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type bodyRequesterFn func([]common.Hash) error
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// headerVerifierFn is a callback type to verify a block's header for fast propagation.
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type headerVerifierFn func(header *types.Header) error
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// blockBroadcasterFn is a callback type for broadcasting a block to connected peers.
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type blockBroadcasterFn func(block *types.Block, propagate bool)
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// chainHeightFn is a callback type to retrieve the current chain height.
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type chainHeightFn func() uint64
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// chainInsertFn is a callback type to insert a batch of blocks into the local chain.
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type chainInsertFn func(types.Blocks) (int, error)
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// peerDropFn is a callback type for dropping a peer detected as malicious.
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type peerDropFn func(id string)
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// announce is the hash notification of the availability of a new block in the
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// network.
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type announce struct {
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hash common.Hash // Hash of the block being announced
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number uint64 // Number of the block being announced (0 = unknown | old protocol)
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header *types.Header // Header of the block partially reassembled (new protocol)
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time time.Time // Timestamp of the announcement
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origin string // Identifier of the peer originating the notification
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fetchHeader headerRequesterFn // Fetcher function to retrieve the header of an announced block
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fetchBodies bodyRequesterFn // Fetcher function to retrieve the body of an announced block
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}
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// headerFilterTask represents a batch of headers needing fetcher filtering.
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type headerFilterTask struct {
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peer string // The source peer of block headers
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headers []*types.Header // Collection of headers to filter
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time time.Time // Arrival time of the headers
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}
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// bodyFilterTask represents a batch of block bodies (transactions and uncles)
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// needing fetcher filtering.
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type bodyFilterTask struct {
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peer string // The source peer of block bodies
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transactions [][]*types.Transaction // Collection of transactions per block bodies
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uncles [][]*types.Header // Collection of uncles per block bodies
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time time.Time // Arrival time of the blocks' contents
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}
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// inject represents a schedules import operation.
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type inject struct {
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origin string
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block *types.Block
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}
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// Fetcher is responsible for accumulating block announcements from various peers
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// and scheduling them for retrieval.
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type Fetcher struct {
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// Various event channels
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notify chan *announce
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inject chan *inject
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headerFilter chan chan *headerFilterTask
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bodyFilter chan chan *bodyFilterTask
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done chan common.Hash
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quit chan struct{}
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// Announce states
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announces map[string]int // Per peer announce counts to prevent memory exhaustion
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announced map[common.Hash][]*announce // Announced blocks, scheduled for fetching
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fetching map[common.Hash]*announce // Announced blocks, currently fetching
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fetched map[common.Hash][]*announce // Blocks with headers fetched, scheduled for body retrieval
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completing map[common.Hash]*announce // Blocks with headers, currently body-completing
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// Block cache
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queue *prque.Prque // Queue containing the import operations (block number sorted)
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queues map[string]int // Per peer block counts to prevent memory exhaustion
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queued map[common.Hash]*inject // Set of already queued blocks (to dedupe imports)
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// Callbacks
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getBlock blockRetrievalFn // Retrieves a block from the local chain
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verifyHeader headerVerifierFn // Checks if a block's headers have a valid proof of work
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broadcastBlock blockBroadcasterFn // Broadcasts a block to connected peers
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chainHeight chainHeightFn // Retrieves the current chain's height
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insertChain chainInsertFn // Injects a batch of blocks into the chain
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dropPeer peerDropFn // Drops a peer for misbehaving
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// Testing hooks
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announceChangeHook func(common.Hash, bool) // Method to call upon adding or deleting a hash from the announce list
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queueChangeHook func(common.Hash, bool) // Method to call upon adding or deleting a block from the import queue
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fetchingHook func([]common.Hash) // Method to call upon starting a block (eth/61) or header (eth/62) fetch
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completingHook func([]common.Hash) // Method to call upon starting a block body fetch (eth/62)
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importedHook func(*types.Block) // Method to call upon successful block import (both eth/61 and eth/62)
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}
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// New creates a block fetcher to retrieve blocks based on hash announcements.
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func New(getBlock blockRetrievalFn, verifyHeader headerVerifierFn, broadcastBlock blockBroadcasterFn, chainHeight chainHeightFn, insertChain chainInsertFn, dropPeer peerDropFn) *Fetcher {
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return &Fetcher{
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notify: make(chan *announce),
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inject: make(chan *inject),
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headerFilter: make(chan chan *headerFilterTask),
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bodyFilter: make(chan chan *bodyFilterTask),
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done: make(chan common.Hash),
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quit: make(chan struct{}),
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announces: make(map[string]int),
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announced: make(map[common.Hash][]*announce),
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fetching: make(map[common.Hash]*announce),
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fetched: make(map[common.Hash][]*announce),
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completing: make(map[common.Hash]*announce),
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queue: prque.New(nil),
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queues: make(map[string]int),
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queued: make(map[common.Hash]*inject),
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getBlock: getBlock,
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verifyHeader: verifyHeader,
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broadcastBlock: broadcastBlock,
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chainHeight: chainHeight,
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insertChain: insertChain,
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dropPeer: dropPeer,
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}
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}
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// Start boots up the announcement based synchroniser, accepting and processing
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// hash notifications and block fetches until termination requested.
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func (f *Fetcher) Start() {
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go f.loop()
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}
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// Stop terminates the announcement based synchroniser, canceling all pending
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// operations.
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func (f *Fetcher) Stop() {
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close(f.quit)
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}
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// Notify announces the fetcher of the potential availability of a new block in
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// the network.
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func (f *Fetcher) Notify(peer string, hash common.Hash, number uint64, time time.Time,
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headerFetcher headerRequesterFn, bodyFetcher bodyRequesterFn) error {
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block := &announce{
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hash: hash,
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number: number,
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time: time,
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origin: peer,
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fetchHeader: headerFetcher,
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fetchBodies: bodyFetcher,
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}
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select {
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case f.notify <- block:
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return nil
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case <-f.quit:
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return errTerminated
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}
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}
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// Enqueue tries to fill gaps the fetcher's future import queue.
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func (f *Fetcher) Enqueue(peer string, block *types.Block) error {
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op := &inject{
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origin: peer,
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block: block,
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}
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select {
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case f.inject <- op:
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return nil
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case <-f.quit:
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return errTerminated
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}
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}
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// FilterHeaders extracts all the headers that were explicitly requested by the fetcher,
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// returning those that should be handled differently.
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func (f *Fetcher) FilterHeaders(peer string, headers []*types.Header, time time.Time) []*types.Header {
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log.Trace("Filtering headers", "peer", peer, "headers", len(headers))
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// Send the filter channel to the fetcher
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filter := make(chan *headerFilterTask)
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select {
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case f.headerFilter <- filter:
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case <-f.quit:
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return nil
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}
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// Request the filtering of the header list
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select {
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case filter <- &headerFilterTask{peer: peer, headers: headers, time: time}:
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case <-f.quit:
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return nil
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}
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// Retrieve the headers remaining after filtering
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select {
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case task := <-filter:
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return task.headers
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case <-f.quit:
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return nil
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}
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}
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// FilterBodies extracts all the block bodies that were explicitly requested by
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// the fetcher, returning those that should be handled differently.
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func (f *Fetcher) FilterBodies(peer string, transactions [][]*types.Transaction, uncles [][]*types.Header, time time.Time) ([][]*types.Transaction, [][]*types.Header) {
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log.Trace("Filtering bodies", "peer", peer, "txs", len(transactions), "uncles", len(uncles))
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// Send the filter channel to the fetcher
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filter := make(chan *bodyFilterTask)
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select {
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case f.bodyFilter <- filter:
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case <-f.quit:
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return nil, nil
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}
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// Request the filtering of the body list
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select {
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case filter <- &bodyFilterTask{peer: peer, transactions: transactions, uncles: uncles, time: time}:
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case <-f.quit:
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return nil, nil
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}
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// Retrieve the bodies remaining after filtering
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select {
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case task := <-filter:
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return task.transactions, task.uncles
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case <-f.quit:
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return nil, nil
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}
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}
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// Loop is the main fetcher loop, checking and processing various notification
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// events.
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func (f *Fetcher) loop() {
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// Iterate the block fetching until a quit is requested
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fetchTimer := time.NewTimer(0)
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completeTimer := time.NewTimer(0)
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for {
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// Clean up any expired block fetches
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for hash, announce := range f.fetching {
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if time.Since(announce.time) > fetchTimeout {
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f.forgetHash(hash)
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}
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}
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// Import any queued blocks that could potentially fit
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height := f.chainHeight()
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for !f.queue.Empty() {
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op := f.queue.PopItem().(*inject)
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hash := op.block.Hash()
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if f.queueChangeHook != nil {
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f.queueChangeHook(hash, false)
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}
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// If too high up the chain or phase, continue later
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number := op.block.NumberU64()
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if number > height+1 {
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f.queue.Push(op, -int64(number))
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if f.queueChangeHook != nil {
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f.queueChangeHook(hash, true)
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}
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break
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}
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// Otherwise if fresh and still unknown, try and import
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if number+maxUncleDist < height || f.getBlock(hash) != nil {
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f.forgetBlock(hash)
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continue
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}
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f.insert(op.origin, op.block)
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}
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// Wait for an outside event to occur
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select {
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case <-f.quit:
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// Fetcher terminating, abort all operations
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return
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case notification := <-f.notify:
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// A block was announced, make sure the peer isn't DOSing us
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propAnnounceInMeter.Mark(1)
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count := f.announces[notification.origin] + 1
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if count > hashLimit {
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log.Debug("Peer exceeded outstanding announces", "peer", notification.origin, "limit", hashLimit)
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propAnnounceDOSMeter.Mark(1)
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break
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}
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// If we have a valid block number, check that it's potentially useful
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if notification.number > 0 {
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if dist := int64(notification.number) - int64(f.chainHeight()); dist < -maxUncleDist || dist > maxQueueDist {
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log.Debug("Peer discarded announcement", "peer", notification.origin, "number", notification.number, "hash", notification.hash, "distance", dist)
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propAnnounceDropMeter.Mark(1)
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break
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}
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}
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// All is well, schedule the announce if block's not yet downloading
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if _, ok := f.fetching[notification.hash]; ok {
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break
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}
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if _, ok := f.completing[notification.hash]; ok {
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break
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}
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f.announces[notification.origin] = count
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f.announced[notification.hash] = append(f.announced[notification.hash], notification)
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if f.announceChangeHook != nil && len(f.announced[notification.hash]) == 1 {
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f.announceChangeHook(notification.hash, true)
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}
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if len(f.announced) == 1 {
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f.rescheduleFetch(fetchTimer)
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}
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case op := <-f.inject:
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// A direct block insertion was requested, try and fill any pending gaps
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propBroadcastInMeter.Mark(1)
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f.enqueue(op.origin, op.block)
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case hash := <-f.done:
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// A pending import finished, remove all traces of the notification
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f.forgetHash(hash)
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f.forgetBlock(hash)
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case <-fetchTimer.C:
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// At least one block's timer ran out, check for needing retrieval
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request := make(map[string][]common.Hash)
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for hash, announces := range f.announced {
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if time.Since(announces[0].time) > arriveTimeout-gatherSlack {
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// Pick a random peer to retrieve from, reset all others
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announce := announces[rand.Intn(len(announces))]
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f.forgetHash(hash)
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// If the block still didn't arrive, queue for fetching
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if f.getBlock(hash) == nil {
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request[announce.origin] = append(request[announce.origin], hash)
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f.fetching[hash] = announce
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}
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}
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}
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// Send out all block header requests
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for peer, hashes := range request {
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log.Trace("Fetching scheduled headers", "peer", peer, "list", hashes)
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// Create a closure of the fetch and schedule in on a new thread
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fetchHeader, hashes := f.fetching[hashes[0]].fetchHeader, hashes
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go func() {
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if f.fetchingHook != nil {
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f.fetchingHook(hashes)
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}
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for _, hash := range hashes {
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headerFetchMeter.Mark(1)
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fetchHeader(hash) // Suboptimal, but protocol doesn't allow batch header retrievals
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}
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}()
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}
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// Schedule the next fetch if blocks are still pending
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f.rescheduleFetch(fetchTimer)
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case <-completeTimer.C:
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// At least one header's timer ran out, retrieve everything
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request := make(map[string][]common.Hash)
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for hash, announces := range f.fetched {
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// Pick a random peer to retrieve from, reset all others
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announce := announces[rand.Intn(len(announces))]
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f.forgetHash(hash)
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// If the block still didn't arrive, queue for completion
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if f.getBlock(hash) == nil {
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request[announce.origin] = append(request[announce.origin], hash)
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f.completing[hash] = announce
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}
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}
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// Send out all block body requests
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for peer, hashes := range request {
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log.Trace("Fetching scheduled bodies", "peer", peer, "list", hashes)
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// Create a closure of the fetch and schedule in on a new thread
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if f.completingHook != nil {
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f.completingHook(hashes)
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}
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bodyFetchMeter.Mark(int64(len(hashes)))
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go f.completing[hashes[0]].fetchBodies(hashes)
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}
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// Schedule the next fetch if blocks are still pending
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f.rescheduleComplete(completeTimer)
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case filter := <-f.headerFilter:
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// Headers arrived from a remote peer. Extract those that were explicitly
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// requested by the fetcher, and return everything else so it's delivered
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// to other parts of the system.
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var task *headerFilterTask
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select {
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case task = <-filter:
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case <-f.quit:
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return
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}
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headerFilterInMeter.Mark(int64(len(task.headers)))
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// Split the batch of headers into unknown ones (to return to the caller),
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// known incomplete ones (requiring body retrievals) and completed blocks.
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unknown, incomplete, complete := []*types.Header{}, []*announce{}, []*types.Block{}
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for _, header := range task.headers {
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hash := header.Hash()
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// Filter fetcher-requested headers from other synchronisation algorithms
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if announce := f.fetching[hash]; announce != nil && announce.origin == task.peer && f.fetched[hash] == nil && f.completing[hash] == nil && f.queued[hash] == nil {
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// If the delivered header does not match the promised number, drop the announcer
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if header.Number.Uint64() != announce.number {
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log.Trace("Invalid block number fetched", "peer", announce.origin, "hash", header.Hash(), "announced", announce.number, "provided", header.Number)
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f.dropPeer(announce.origin)
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f.forgetHash(hash)
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continue
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}
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// Only keep if not imported by other means
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if f.getBlock(hash) == nil {
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announce.header = header
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announce.time = task.time
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// If the block is empty (header only), short circuit into the final import queue
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if header.TxHash == types.DeriveSha(types.Transactions{}) && header.UncleHash == types.CalcUncleHash([]*types.Header{}) {
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log.Trace("Block empty, skipping body retrieval", "peer", announce.origin, "number", header.Number, "hash", header.Hash())
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block := types.NewBlockWithHeader(header)
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block.ReceivedAt = task.time
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complete = append(complete, block)
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f.completing[hash] = announce
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continue
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}
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// Otherwise add to the list of blocks needing completion
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incomplete = append(incomplete, announce)
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} else {
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log.Trace("Block already imported, discarding header", "peer", announce.origin, "number", header.Number, "hash", header.Hash())
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f.forgetHash(hash)
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}
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} else {
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// Fetcher doesn't know about it, add to the return list
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unknown = append(unknown, header)
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}
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}
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headerFilterOutMeter.Mark(int64(len(unknown)))
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select {
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case filter <- &headerFilterTask{headers: unknown, time: task.time}:
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case <-f.quit:
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return
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}
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// Schedule the retrieved headers for body completion
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for _, announce := range incomplete {
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hash := announce.header.Hash()
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if _, ok := f.completing[hash]; ok {
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continue
|
|
}
|
|
f.fetched[hash] = append(f.fetched[hash], announce)
|
|
if len(f.fetched) == 1 {
|
|
f.rescheduleComplete(completeTimer)
|
|
}
|
|
}
|
|
// Schedule the header-only blocks for import
|
|
for _, block := range complete {
|
|
if announce := f.completing[block.Hash()]; announce != nil {
|
|
f.enqueue(announce.origin, block)
|
|
}
|
|
}
|
|
|
|
case filter := <-f.bodyFilter:
|
|
// Block bodies arrived, extract any explicitly requested blocks, return the rest
|
|
var task *bodyFilterTask
|
|
select {
|
|
case task = <-filter:
|
|
case <-f.quit:
|
|
return
|
|
}
|
|
bodyFilterInMeter.Mark(int64(len(task.transactions)))
|
|
|
|
blocks := []*types.Block{}
|
|
for i := 0; i < len(task.transactions) && i < len(task.uncles); i++ {
|
|
// Match up a body to any possible completion request
|
|
matched := false
|
|
|
|
for hash, announce := range f.completing {
|
|
if f.queued[hash] == nil {
|
|
txnHash := types.DeriveSha(types.Transactions(task.transactions[i]))
|
|
uncleHash := types.CalcUncleHash(task.uncles[i])
|
|
|
|
if txnHash == announce.header.TxHash && uncleHash == announce.header.UncleHash && announce.origin == task.peer {
|
|
// Mark the body matched, reassemble if still unknown
|
|
matched = true
|
|
|
|
if f.getBlock(hash) == nil {
|
|
block := types.NewBlockWithHeader(announce.header).WithBody(task.transactions[i], task.uncles[i])
|
|
block.ReceivedAt = task.time
|
|
|
|
blocks = append(blocks, block)
|
|
} else {
|
|
f.forgetHash(hash)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if matched {
|
|
task.transactions = append(task.transactions[:i], task.transactions[i+1:]...)
|
|
task.uncles = append(task.uncles[:i], task.uncles[i+1:]...)
|
|
i--
|
|
continue
|
|
}
|
|
}
|
|
|
|
bodyFilterOutMeter.Mark(int64(len(task.transactions)))
|
|
select {
|
|
case filter <- task:
|
|
case <-f.quit:
|
|
return
|
|
}
|
|
// Schedule the retrieved blocks for ordered import
|
|
for _, block := range blocks {
|
|
if announce := f.completing[block.Hash()]; announce != nil {
|
|
f.enqueue(announce.origin, block)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// rescheduleFetch resets the specified fetch timer to the next announce timeout.
|
|
func (f *Fetcher) rescheduleFetch(fetch *time.Timer) {
|
|
// Short circuit if no blocks are announced
|
|
if len(f.announced) == 0 {
|
|
return
|
|
}
|
|
// Otherwise find the earliest expiring announcement
|
|
earliest := time.Now()
|
|
for _, announces := range f.announced {
|
|
if earliest.After(announces[0].time) {
|
|
earliest = announces[0].time
|
|
}
|
|
}
|
|
fetch.Reset(arriveTimeout - time.Since(earliest))
|
|
}
|
|
|
|
// rescheduleComplete resets the specified completion timer to the next fetch timeout.
|
|
func (f *Fetcher) rescheduleComplete(complete *time.Timer) {
|
|
// Short circuit if no headers are fetched
|
|
if len(f.fetched) == 0 {
|
|
return
|
|
}
|
|
// Otherwise find the earliest expiring announcement
|
|
earliest := time.Now()
|
|
for _, announces := range f.fetched {
|
|
if earliest.After(announces[0].time) {
|
|
earliest = announces[0].time
|
|
}
|
|
}
|
|
complete.Reset(gatherSlack - time.Since(earliest))
|
|
}
|
|
|
|
// enqueue schedules a new future import operation, if the block to be imported
|
|
// has not yet been seen.
|
|
func (f *Fetcher) enqueue(peer string, block *types.Block) {
|
|
hash := block.Hash()
|
|
|
|
// Ensure the peer isn't DOSing us
|
|
count := f.queues[peer] + 1
|
|
if count > blockLimit {
|
|
log.Debug("Discarded propagated block, exceeded allowance", "peer", peer, "number", block.Number(), "hash", hash, "limit", blockLimit)
|
|
propBroadcastDOSMeter.Mark(1)
|
|
f.forgetHash(hash)
|
|
return
|
|
}
|
|
// Discard any past or too distant blocks
|
|
if dist := int64(block.NumberU64()) - int64(f.chainHeight()); dist < -maxUncleDist || dist > maxQueueDist {
|
|
log.Debug("Discarded propagated block, too far away", "peer", peer, "number", block.Number(), "hash", hash, "distance", dist)
|
|
propBroadcastDropMeter.Mark(1)
|
|
f.forgetHash(hash)
|
|
return
|
|
}
|
|
// Schedule the block for future importing
|
|
if _, ok := f.queued[hash]; !ok {
|
|
op := &inject{
|
|
origin: peer,
|
|
block: block,
|
|
}
|
|
f.queues[peer] = count
|
|
f.queued[hash] = op
|
|
f.queue.Push(op, -int64(block.NumberU64()))
|
|
if f.queueChangeHook != nil {
|
|
f.queueChangeHook(op.block.Hash(), true)
|
|
}
|
|
log.Debug("Queued propagated block", "peer", peer, "number", block.Number(), "hash", hash, "queued", f.queue.Size())
|
|
}
|
|
}
|
|
|
|
// insert spawns a new goroutine to run a block insertion into the chain. If the
|
|
// block's number is at the same height as the current import phase, it updates
|
|
// the phase states accordingly.
|
|
func (f *Fetcher) insert(peer string, block *types.Block) {
|
|
hash := block.Hash()
|
|
|
|
// Run the import on a new thread
|
|
log.Debug("Importing propagated block", "peer", peer, "number", block.Number(), "hash", hash)
|
|
go func() {
|
|
defer func() { f.done <- hash }()
|
|
|
|
// If the parent's unknown, abort insertion
|
|
parent := f.getBlock(block.ParentHash())
|
|
if parent == nil {
|
|
log.Debug("Unknown parent of propagated block", "peer", peer, "number", block.Number(), "hash", hash, "parent", block.ParentHash())
|
|
return
|
|
}
|
|
// Quickly validate the header and propagate the block if it passes
|
|
switch err := f.verifyHeader(block.Header()); err {
|
|
case nil:
|
|
// All ok, quickly propagate to our peers
|
|
propBroadcastOutTimer.UpdateSince(block.ReceivedAt)
|
|
go f.broadcastBlock(block, true)
|
|
|
|
case consensus.ErrFutureBlock:
|
|
// Weird future block, don't fail, but neither propagate
|
|
|
|
default:
|
|
// Something went very wrong, drop the peer
|
|
log.Debug("Propagated block verification failed", "peer", peer, "number", block.Number(), "hash", hash, "err", err)
|
|
f.dropPeer(peer)
|
|
return
|
|
}
|
|
// Run the actual import and log any issues
|
|
if _, err := f.insertChain(types.Blocks{block}); err != nil {
|
|
log.Debug("Propagated block import failed", "peer", peer, "number", block.Number(), "hash", hash, "err", err)
|
|
return
|
|
}
|
|
// If import succeeded, broadcast the block
|
|
propAnnounceOutTimer.UpdateSince(block.ReceivedAt)
|
|
go f.broadcastBlock(block, false)
|
|
|
|
// Invoke the testing hook if needed
|
|
if f.importedHook != nil {
|
|
f.importedHook(block)
|
|
}
|
|
}()
|
|
}
|
|
|
|
// forgetHash removes all traces of a block announcement from the fetcher's
|
|
// internal state.
|
|
func (f *Fetcher) forgetHash(hash common.Hash) {
|
|
// Remove all pending announces and decrement DOS counters
|
|
for _, announce := range f.announced[hash] {
|
|
f.announces[announce.origin]--
|
|
if f.announces[announce.origin] == 0 {
|
|
delete(f.announces, announce.origin)
|
|
}
|
|
}
|
|
delete(f.announced, hash)
|
|
if f.announceChangeHook != nil {
|
|
f.announceChangeHook(hash, false)
|
|
}
|
|
// Remove any pending fetches and decrement the DOS counters
|
|
if announce := f.fetching[hash]; announce != nil {
|
|
f.announces[announce.origin]--
|
|
if f.announces[announce.origin] == 0 {
|
|
delete(f.announces, announce.origin)
|
|
}
|
|
delete(f.fetching, hash)
|
|
}
|
|
|
|
// Remove any pending completion requests and decrement the DOS counters
|
|
for _, announce := range f.fetched[hash] {
|
|
f.announces[announce.origin]--
|
|
if f.announces[announce.origin] == 0 {
|
|
delete(f.announces, announce.origin)
|
|
}
|
|
}
|
|
delete(f.fetched, hash)
|
|
|
|
// Remove any pending completions and decrement the DOS counters
|
|
if announce := f.completing[hash]; announce != nil {
|
|
f.announces[announce.origin]--
|
|
if f.announces[announce.origin] == 0 {
|
|
delete(f.announces, announce.origin)
|
|
}
|
|
delete(f.completing, hash)
|
|
}
|
|
}
|
|
|
|
// forgetBlock removes all traces of a queued block from the fetcher's internal
|
|
// state.
|
|
func (f *Fetcher) forgetBlock(hash common.Hash) {
|
|
if insert := f.queued[hash]; insert != nil {
|
|
f.queues[insert.origin]--
|
|
if f.queues[insert.origin] == 0 {
|
|
delete(f.queues, insert.origin)
|
|
}
|
|
delete(f.queued, hash)
|
|
}
|
|
}
|