gaspersic/go-ethereum
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

eth: port the synchronisation algo to eth/62

Browse Source
This commit is contained in:
Péter Szilágyi
2015-08-14 21:25:41 +03:00
parent ca88e18f59
commit 47a7fe5d22
10 changed files with 2012 additions and 343 deletions
Download Patch File Download Diff File Expand all files Collapse all files

401
eth/fetcher/fetcher.go
View File

@ -51,6 +51,12 @@ type blockRetrievalFn func(common.Hash) *types.Block
// blockRequesterFn is a callback type for sending a block retrieval request.
type blockRequesterFn func([]common.Hash) error
// 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
// blockValidatorFn is a callback type to verify a block's header for fast propagation.
type blockValidatorFn func(block *types.Block, parent *types.Block) error
@ -69,12 +75,30 @@ 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)
time time.Time // Timestamp of the announcement
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
fetch blockRequesterFn // Fetcher function to retrieve
origin string // Identifier of the peer originating the notification
fetch61 blockRequesterFn // [eth/61] Fetcher function to retrieve an announced block
fetchHeader headerRequesterFn // [eth/62] Fetcher function to retrieve the header of an announced block
fetchBodies bodyRequesterFn // [eth/62] Fetcher function to retrieve the body of an announced block
}
// headerFilterTask represents a batch of headers needing fetcher filtering.
type headerFilterTask struct {
headers []*types.Header // Collection of headers to filter
time time.Time // Arrival time of the headers
}
// headerFilterTask represents a batch of block bodies (transactions and uncles)
// needing fetcher filtering.
type bodyFilterTask struct {
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.
@ -89,14 +113,20 @@ type Fetcher struct {
// Various event channels
notify chan *announce
inject chan *inject
filter chan chan []*types.Block
done chan common.Hash
quit chan struct{}
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
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)
@ -112,8 +142,9 @@ type Fetcher struct {
dropPeer peerDropFn // Drops a peer for misbehaving
// Testing hooks
fetchingHook func([]common.Hash) // Method to call upon starting a block fetch
importedHook func(*types.Block) // Method to call upon successful block import
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.
@ -121,12 +152,16 @@ func New(getBlock blockRetrievalFn, validateBlock blockValidatorFn, broadcastBlo
return &Fetcher{
notify: make(chan *announce),
inject: make(chan *inject),
filter: make(chan chan []*types.Block),
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(),
queues: make(map[string]int),
queued: make(map[common.Hash]*inject),
@ -153,13 +188,17 @@ func (f *Fetcher) Stop() {
// 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, fetcher blockRequesterFn) error {
func (f *Fetcher) Notify(peer string, hash common.Hash, number uint64, time time.Time,
blockFetcher blockRequesterFn, // eth/61 specific whole block fetcher
headerFetcher headerRequesterFn, bodyFetcher bodyRequesterFn) error {
block := &announce{
hash: hash,
number: number,
time: time,
origin: peer,
fetch: fetcher,
hash: hash,
number: number,
time: time,
origin: peer,
fetch61: blockFetcher,
fetchHeader: headerFetcher,
fetchBodies: bodyFetcher,
}
select {
case f.notify <- block:
@ -183,14 +222,16 @@ func (f *Fetcher) Enqueue(peer string, block *types.Block) error {
}
}
// Filter extracts all the blocks that were explicitly requested by the fetcher,
// FilterBlocks extracts all the blocks that were explicitly requested by the fetcher,
// returning those that should be handled differently.
func (f *Fetcher) Filter(blocks types.Blocks) types.Blocks {
func (f *Fetcher) FilterBlocks(blocks types.Blocks) types.Blocks {
glog.V(logger.Detail).Infof("[eth/61] filtering %d blocks", len(blocks))
// Send the filter channel to the fetcher
filter := make(chan []*types.Block)
select {
case f.filter <- filter:
case f.blockFilter <- filter:
case <-f.quit:
return nil
}
@ -209,11 +250,69 @@ func (f *Fetcher) Filter(blocks types.Blocks) types.Blocks {
}
}
// FilterHeaders extracts all the headers that were explicitly requested by the fetcher,
// returning those that should be handled differently.
func (f *Fetcher) FilterHeaders(headers []*types.Header, time time.Time) []*types.Header {
glog.V(logger.Detail).Infof("[eth/62] filtering %d 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{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(transactions [][]*types.Transaction, uncles [][]*types.Header, time time.Time) ([][]*types.Transaction, [][]*types.Header) {
glog.V(logger.Detail).Infof("[eth/62] filtering %d:%d bodies", len(transactions), 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{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
fetch := time.NewTimer(0)
fetchTimer := time.NewTimer(0)
completeTimer := time.NewTimer(0)
for {
// Clean up any expired block fetches
for hash, announce := range f.fetching {
@ -255,14 +354,25 @@ func (f *Fetcher) loop() {
glog.V(logger.Debug).Infof("Peer %s: exceeded outstanding announces (%d)", notification.origin, hashLimit)
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 {
glog.V(logger.Debug).Infof("[eth/62] Peer %s: discarded announcement #%d [%x…], distance %d", notification.origin, notification.number, notification.hash[:4], dist)
discardMeter.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 len(f.announced) == 1 {
f.reschedule(fetch)
f.rescheduleFetch(fetchTimer)
}
case op := <-f.inject:
@ -275,7 +385,7 @@ func (f *Fetcher) loop() {
f.forgetHash(hash)
f.forgetBlock(hash)
case <-fetch.C:
case <-fetchTimer.C:
// At least one block's timer ran out, check for needing retrieval
request := make(map[string][]common.Hash)
@ -292,30 +402,77 @@ func (f *Fetcher) loop() {
}
}
}
// Send out all block requests
// Send out all block (eth/61) or header (eth/62) requests
for peer, hashes := range request {
if glog.V(logger.Detail) && len(hashes) > 0 {
list := "["
for _, hash := range hashes {
list += fmt.Sprintf("%x, ", hash[:4])
list += fmt.Sprintf("%x…, ", hash[:4])
}
list = list[:len(list)-2] + "]"
glog.V(logger.Detail).Infof("Peer %s: fetching %s", peer, list)
if f.fetching[hashes[0]].fetch61 != nil {
glog.V(logger.Detail).Infof("[eth/61] Peer %s: fetching blocks %s", peer, list)
} else {
glog.V(logger.Detail).Infof("[eth/62] Peer %s: fetching headers %s", peer, list)
}
}
// Create a closure of the fetch and schedule in on a new thread
fetcher, hashes := f.fetching[hashes[0]].fetch, hashes
fetchBlocks, fetchHeader, hashes := f.fetching[hashes[0]].fetch61, f.fetching[hashes[0]].fetchHeader, hashes
go func() {
if f.fetchingHook != nil {
f.fetchingHook(hashes)
}
fetcher(hashes)
if fetchBlocks != nil {
// Use old eth/61 protocol to retrieve whole blocks
fetchBlocks(hashes)
} else {
// Use new eth/62 protocol to retrieve headers first
for _, hash := range hashes {
fetchHeader(hash) // Suboptimal, but protocol doesn't allow batch header retrievals
}
}
}()
}
// Schedule the next fetch if blocks are still pending
f.reschedule(fetch)
f.rescheduleFetch(fetchTimer)
case filter := <-f.filter:
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 {
if glog.V(logger.Detail) && len(hashes) > 0 {
list := "["
for _, hash := range hashes {
list += fmt.Sprintf("%x…, ", hash[:4])
}
list = list[:len(list)-2] + "]"
glog.V(logger.Detail).Infof("[eth/62] Peer %s: fetching bodies %s", peer, list)
}
// Create a closure of the fetch and schedule in on a new thread
if f.completingHook != nil {
f.completingHook(hashes)
}
go f.completing[hashes[0]].fetchBodies(hashes)
}
// Schedule the next fetch if blocks are still pending
f.rescheduleComplete(completeTimer)
case filter := <-f.blockFilter:
// Blocks arrived, extract any explicit fetches, return all else
var blocks types.Blocks
select {
@ -352,12 +509,135 @@ func (f *Fetcher) loop() {
f.enqueue(announce.origin, block)
}
}
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
}
// 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 && 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 {
glog.V(logger.Detail).Infof("[eth/62] Peer %s: invalid block number for [%x…]: announced %d, provided %d", announce.origin, header.Hash().Bytes()[:4], announce.number, header.Number.Uint64())
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{}) {
glog.V(logger.Detail).Infof("[eth/62] Peer %s: block #%d [%x…] empty, skipping body retrieval", announce.origin, header.Number.Uint64(), header.Hash().Bytes()[:4])
complete = append(complete, types.NewBlockWithHeader(header))
f.completing[hash] = announce
continue
}
// Otherwise add to the list of blocks needing completion
incomplete = append(incomplete, announce)
} else {
glog.V(logger.Detail).Infof("[eth/62] Peer %s: block #%d [%x…] already imported, discarding header", announce.origin, header.Number.Uint64(), header.Hash().Bytes()[:4])
f.forgetHash(hash)
}
} else {
// Fetcher doesn't know about it, add to the return list
unknown = append(unknown, header)
}
}
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
}
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 {
// Mark the body matched, reassemble if still unknown
matched = true
if f.getBlock(hash) == nil {
blocks = append(blocks, types.NewBlockWithHeader(announce.header).WithBody(task.transactions[i], task.uncles[i]))
} 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
}
}
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)
}
}
}
}
}
// reschedule resets the specified fetch timer to the next announce timeout.
func (f *Fetcher) reschedule(fetch *time.Timer) {
// 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
@ -372,6 +652,22 @@ func (f *Fetcher) reschedule(fetch *time.Timer) {
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) {
@ -380,13 +676,15 @@ func (f *Fetcher) enqueue(peer string, block *types.Block) {
// Ensure the peer isn't DOSing us
count := f.queues[peer] + 1
if count > blockLimit {
glog.V(logger.Debug).Infof("Peer %s: discarded block #%d [%x], exceeded allowance (%d)", peer, block.NumberU64(), hash.Bytes()[:4], blockLimit)
glog.V(logger.Debug).Infof("Peer %s: discarded block #%d [%x…], exceeded allowance (%d)", peer, block.NumberU64(), hash.Bytes()[:4], blockLimit)
f.forgetHash(hash)
return
}
// Discard any past or too distant blocks
if dist := int64(block.NumberU64()) - int64(f.chainHeight()); dist < -maxUncleDist || dist > maxQueueDist {
glog.V(logger.Debug).Infof("Peer %s: discarded block #%d [%x], distance %d", peer, block.NumberU64(), hash.Bytes()[:4], dist)
glog.V(logger.Debug).Infof("Peer %s: discarded block #%d [%x…], distance %d", peer, block.NumberU64(), hash.Bytes()[:4], dist)
discardMeter.Mark(1)
f.forgetHash(hash)
return
}
// Schedule the block for future importing
@ -400,7 +698,7 @@ func (f *Fetcher) enqueue(peer string, block *types.Block) {
f.queue.Push(op, -float32(block.NumberU64()))
if glog.V(logger.Debug) {
glog.Infof("Peer %s: queued block #%d [%x], total %v", peer, block.NumberU64(), hash.Bytes()[:4], f.queue.Size())
glog.Infof("Peer %s: queued block #%d [%x…], total %v", peer, block.NumberU64(), hash.Bytes()[:4], f.queue.Size())
}
}
}
@ -412,13 +710,14 @@ func (f *Fetcher) insert(peer string, block *types.Block) {
hash := block.Hash()
// Run the import on a new thread
glog.V(logger.Debug).Infof("Peer %s: importing block #%d [%x]", peer, block.NumberU64(), hash[:4])
glog.V(logger.Debug).Infof("Peer %s: importing block #%d [%x…]", peer, block.NumberU64(), hash[:4])
go func() {
defer func() { f.done <- hash }()
// If the parent's unknown, abort insertion
parent := f.getBlock(block.ParentHash())
if parent == nil {
glog.V(logger.Debug).Infof("Peer %s: parent []%x] of block #%d [%x…] unknown", block.ParentHash().Bytes()[:4], peer, block.NumberU64(), hash[:4])
return
}
// Quickly validate the header and propagate the block if it passes
@ -434,13 +733,13 @@ func (f *Fetcher) insert(peer string, block *types.Block) {
default:
// Something went very wrong, drop the peer
glog.V(logger.Debug).Infof("Peer %s: block #%d [%x] verification failed: %v", peer, block.NumberU64(), hash[:4], err)
glog.V(logger.Debug).Infof("Peer %s: block #%d [%x…] verification failed: %v", peer, block.NumberU64(), hash[:4], err)
f.dropPeer(peer)
return
}
// Run the actual import and log any issues
if _, err := f.insertChain(types.Blocks{block}); err != nil {
glog.V(logger.Warn).Infof("Peer %s: block #%d [%x] import failed: %v", peer, block.NumberU64(), hash[:4], err)
glog.V(logger.Warn).Infof("Peer %s: block #%d [%x…] import failed: %v", peer, block.NumberU64(), hash[:4], err)
return
}
// If import succeeded, broadcast the block
@ -474,9 +773,27 @@ func (f *Fetcher) forgetHash(hash common.Hash) {
}
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 frmo the fetcher's internal
// 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 {