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