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eth: port the synchronisation algo to eth/62

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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
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678
eth/downloader/downloader.go
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@ -26,12 +26,10 @@ import (
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"gopkg.in/fatih/set.v0"
)
const (
@ -40,40 +38,44 @@ const (
)
var (
MinHashFetch = 512 // Minimum amount of hashes to not consider a peer stalling
MaxHashFetch = 512 // Amount of hashes to be fetched per retrieval request
MaxBlockFetch = 128 // Amount of blocks to be fetched per retrieval request
MaxHeaderFetch = 256 // Amount of block headers to be fetched per retrieval request
MaxHeaderFetch = 192 // Amount of block headers to be fetched per retrieval request
MaxBodyFetch = 128 // Amount of block bodies to be fetched per retrieval request
MaxStateFetch = 384 // Amount of node state values to allow fetching per request
MaxReceiptsFetch = 384 // Amount of transaction receipts to allow fetching per request
hashTTL = 5 * time.Second // Time it takes for a hash request to time out
blockSoftTTL = 3 * time.Second // Request completion threshold for increasing or decreasing a peer's bandwidth
blockHardTTL = 3 * blockSoftTTL // Maximum time allowance before a block request is considered expired
crossCheckCycle = time.Second // Period after which to check for expired cross checks
hashTTL = 5 * time.Second // [eth/61] Time it takes for a hash request to time out
blockSoftTTL = 3 * time.Second // [eth/61] Request completion threshold for increasing or decreasing a peer's bandwidth
blockHardTTL = 3 * blockSoftTTL // [eth/61] Maximum time allowance before a block request is considered expired
headerTTL = 5 * time.Second // [eth/62] Time it takes for a header request to time out
bodySoftTTL = 3 * time.Second // [eth/62] Request completion threshold for increasing or decreasing a peer's bandwidth
bodyHardTTL = 3 * bodySoftTTL // [eth/62] Maximum time allowance before a block body request is considered expired
maxQueuedHashes = 256 * 1024 // Maximum number of hashes to queue for import (DOS protection)
maxBannedHashes = 4096 // Number of bannable hashes before phasing old ones out
maxBlockProcess = 256 // Number of blocks to import at once into the chain
maxQueuedHashes = 256 * 1024 // [eth/61] Maximum number of hashes to queue for import (DOS protection)
maxQueuedHeaders = 256 * 1024 // [eth/62] Maximum number of headers to queue for import (DOS protection)
maxBlockProcess = 256 // Number of blocks to import at once into the chain
)
var (
errBusy = errors.New("busy")
errUnknownPeer = errors.New("peer is unknown or unhealthy")
errBadPeer = errors.New("action from bad peer ignored")
errStallingPeer = errors.New("peer is stalling")
errBannedHead = errors.New("peer head hash already banned")
errNoPeers = errors.New("no peers to keep download active")
errPendingQueue = errors.New("pending items in queue")
errTimeout = errors.New("timeout")
errEmptyHashSet = errors.New("empty hash set by peer")
errPeersUnavailable = errors.New("no peers available or all peers tried for block download process")
errAlreadyInPool = errors.New("hash already in pool")
errInvalidChain = errors.New("retrieved hash chain is invalid")
errCrossCheckFailed = errors.New("block cross-check failed")
errCancelHashFetch = errors.New("hash fetching canceled (requested)")
errCancelBlockFetch = errors.New("block downloading canceled (requested)")
errNoSyncActive = errors.New("no sync active")
errBusy = errors.New("busy")
errUnknownPeer = errors.New("peer is unknown or unhealthy")
errBadPeer = errors.New("action from bad peer ignored")
errStallingPeer = errors.New("peer is stalling")
errNoPeers = errors.New("no peers to keep download active")
errPendingQueue = errors.New("pending items in queue")
errTimeout = errors.New("timeout")
errEmptyHashSet = errors.New("empty hash set by peer")
errEmptyHeaderSet = errors.New("empty header set by peer")
errPeersUnavailable = errors.New("no peers available or all peers tried for block download process")
errAlreadyInPool = errors.New("hash already in pool")
errInvalidChain = errors.New("retrieved hash chain is invalid")
errInvalidBody = errors.New("retrieved block body is invalid")
errCancelHashFetch = errors.New("hash fetching canceled (requested)")
errCancelBlockFetch = errors.New("block downloading canceled (requested)")
errCancelHeaderFetch = errors.New("block header fetching canceled (requested)")
errCancelBodyFetch = errors.New("block body downloading canceled (requested)")
errNoSyncActive = errors.New("no sync active")
)
// hashCheckFn is a callback type for verifying a hash's presence in the local chain.
@ -91,28 +93,36 @@ type chainInsertFn func(types.Blocks) (int, error)
// peerDropFn is a callback type for dropping a peer detected as malicious.
type peerDropFn func(id string)
type blockPack struct {
peerId string
blocks []*types.Block
}
// hashPack is a batch of block hashes returned by a peer (eth/61).
type hashPack struct {
peerId string
hashes []common.Hash
}
type crossCheck struct {
expire time.Time
parent common.Hash
// blockPack is a batch of blocks returned by a peer (eth/61).
type blockPack struct {
peerId string
blocks []*types.Block
}
// headerPack is a batch of block headers returned by a peer.
type headerPack struct {
peerId string
headers []*types.Header
}
// bodyPack is a batch of block bodies returned by a peer.
type bodyPack struct {
peerId string
transactions [][]*types.Transaction
uncles [][]*types.Header
}
type Downloader struct {
mux *event.TypeMux
queue *queue // Scheduler for selecting the hashes to download
peers *peerSet // Set of active peers from which download can proceed
checks map[common.Hash]*crossCheck // Pending cross checks to verify a hash chain
banned *set.Set // Set of hashes we've received and banned
queue *queue // Scheduler for selecting the hashes to download
peers *peerSet // Set of active peers from which download can proceed
interrupt int32 // Atomic boolean to signal termination
@ -137,12 +147,18 @@ type Downloader struct {
// Channels
newPeerCh chan *peer
hashCh chan hashPack // Channel receiving inbound hashes
blockCh chan blockPack // Channel receiving inbound blocks
processCh chan bool // Channel to signal the block fetcher of new or finished work
hashCh chan hashPack // [eth/61] Channel receiving inbound hashes
blockCh chan blockPack // [eth/61] Channel receiving inbound blocks
headerCh chan headerPack // [eth/62] Channel receiving inbound block headers
bodyCh chan bodyPack // [eth/62] Channel receiving inbound block bodies
processCh chan bool // Channel to signal the block fetcher of new or finished work
cancelCh chan struct{} // Channel to cancel mid-flight syncs
cancelLock sync.RWMutex // Lock to protect the cancel channel in delivers
// Testing hooks
bodyFetchHook func([]*types.Header) // Method to call upon starting a block body fetch
chainInsertHook func([]*Block) // Method to call upon inserting a chain of blocks (possibly in multiple invocations)
}
// Block is an origin-tagged blockchain block.
@ -153,8 +169,7 @@ type Block struct {
// New creates a new downloader to fetch hashes and blocks from remote peers.
func New(mux *event.TypeMux, hasBlock hashCheckFn, getBlock blockRetrievalFn, headBlock headRetrievalFn, insertChain chainInsertFn, dropPeer peerDropFn) *Downloader {
// Create the base downloader
downloader := &Downloader{
return &Downloader{
mux: mux,
queue: newQueue(),
peers: newPeerSet(),
@ -166,14 +181,10 @@ func New(mux *event.TypeMux, hasBlock hashCheckFn, getBlock blockRetrievalFn, he
newPeerCh: make(chan *peer, 1),
hashCh: make(chan hashPack, 1),
blockCh: make(chan blockPack, 1),
headerCh: make(chan headerPack, 1),
bodyCh: make(chan bodyPack, 1),
processCh: make(chan bool, 1),
}
// Inject all the known bad hashes
downloader.banned = set.New()
for hash, _ := range core.BadHashes {
downloader.banned.Add(hash)
}
return downloader
}
// Stats retrieves the current status of the downloader.
@ -206,15 +217,12 @@ func (d *Downloader) Synchronising() bool {
// RegisterPeer injects a new download peer into the set of block source to be
// used for fetching hashes and blocks from.
func (d *Downloader) RegisterPeer(id string, version int, head common.Hash, getRelHashes relativeHashFetcherFn, getAbsHashes absoluteHashFetcherFn, getBlocks blockFetcherFn) error {
// If the peer wants to send a banned hash, reject
if d.banned.Has(head) {
glog.V(logger.Debug).Infoln("Register rejected, head hash banned:", id)
return errBannedHead
}
// Otherwise try to construct and register the peer
func (d *Downloader) RegisterPeer(id string, version int, head common.Hash,
getRelHashes relativeHashFetcherFn, getAbsHashes absoluteHashFetcherFn, getBlocks blockFetcherFn, // eth/61 callbacks, remove when upgrading
getRelHeaders relativeHeaderFetcherFn, getAbsHeaders absoluteHeaderFetcherFn, getBlockBodies blockBodyFetcherFn) error {
glog.V(logger.Detail).Infoln("Registering peer", id)
if err := d.peers.Register(newPeer(id, version, head, getRelHashes, getAbsHashes, getBlocks)); err != nil {
if err := d.peers.Register(newPeer(id, version, head, getRelHashes, getAbsHashes, getBlocks, getRelHeaders, getAbsHeaders, getBlockBodies)); err != nil {
glog.V(logger.Error).Infoln("Register failed:", err)
return err
}
@ -235,7 +243,7 @@ func (d *Downloader) UnregisterPeer(id string) error {
// Synchronise tries to sync up our local block chain with a remote peer, both
// adding various sanity checks as well as wrapping it with various log entries.
func (d *Downloader) Synchronise(id string, head common.Hash, td *big.Int) {
glog.V(logger.Detail).Infof("Attempting synchronisation: %v, head 0x%x, TD %v", id, head[:4], td)
glog.V(logger.Detail).Infof("Attempting synchronisation: %v, head [%x…], TD %v", id, head[:4], td)
switch err := d.synchronise(id, head, td); err {
case nil:
@ -244,7 +252,7 @@ func (d *Downloader) Synchronise(id string, head common.Hash, td *big.Int) {
case errBusy:
glog.V(logger.Detail).Infof("Synchronisation already in progress")
case errTimeout, errBadPeer, errStallingPeer, errBannedHead, errEmptyHashSet, errPeersUnavailable, errInvalidChain, errCrossCheckFailed:
case errTimeout, errBadPeer, errStallingPeer, errEmptyHashSet, errEmptyHeaderSet, errPeersUnavailable, errInvalidChain:
glog.V(logger.Debug).Infof("Removing peer %v: %v", id, err)
d.dropPeer(id)
@ -270,10 +278,6 @@ func (d *Downloader) synchronise(id string, hash common.Hash, td *big.Int) error
}
defer atomic.StoreInt32(&d.synchronising, 0)
// If the head hash is banned, terminate immediately
if d.banned.Has(hash) {
return errBannedHead
}
// Post a user notification of the sync (only once per session)
if atomic.CompareAndSwapInt32(&d.notified, 0, 1) {
glog.V(logger.Info).Infoln("Block synchronisation started")
@ -285,7 +289,6 @@ func (d *Downloader) synchronise(id string, hash common.Hash, td *big.Int) error
// Reset the queue and peer set to clean any internal leftover state
d.queue.Reset()
d.peers.Reset()
d.checks = make(map[common.Hash]*crossCheck)
// Create cancel channel for aborting mid-flight
d.cancelLock.Lock()
@ -320,17 +323,37 @@ func (d *Downloader) syncWithPeer(p *peer, hash common.Hash, td *big.Int) (err e
}
}()
glog.V(logger.Debug).Infof("Synchronizing with the network using: %s, eth/%d", p.id, p.version)
switch p.version {
case eth61:
glog.V(logger.Debug).Infof("Synchronising with the network using: %s [eth/%d]", p.id, p.version)
defer glog.V(logger.Debug).Infof("Synchronisation terminated")
switch {
case p.version == eth61:
// Old eth/61, use forward, concurrent hash and block retrieval algorithm
number, err := d.findAncestor61(p)
if err != nil {
return err
}
errc := make(chan error, 2)
go func() { errc <- d.fetchHashes61(p, td, number+1) }()
go func() { errc <- d.fetchBlocks61(number + 1) }()
// If any fetcher fails, cancel the other
if err := <-errc; err != nil {
d.cancel()
<-errc
return err
}
return <-errc
case p.version >= eth62:
// New eth/62, use forward, concurrent header and block body retrieval algorithm
number, err := d.findAncestor(p)
if err != nil {
return err
}
errc := make(chan error, 2)
go func() { errc <- d.fetchHashes(p, td, number+1) }()
go func() { errc <- d.fetchBlocks(number + 1) }()
go func() { errc <- d.fetchHeaders(p, td, number+1) }()
go func() { errc <- d.fetchBodies(number + 1) }()
// If any fetcher fails, cancel the other
if err := <-errc; err != nil {
@ -373,17 +396,17 @@ func (d *Downloader) Terminate() {
d.cancel()
}
// findAncestor tries to locate the common ancestor block of the local chain and
// findAncestor61 tries to locate the common ancestor block of the local chain and
// a remote peers blockchain. In the general case when our node was in sync and
// on the correct chain, checking the top N blocks should already get us a match.
// In the rare scenario when we ended up on a long soft fork (i.e. none of the
// head blocks match), we do a binary search to find the common ancestor.
func (d *Downloader) findAncestor(p *peer) (uint64, error) {
// In the rare scenario when we ended up on a long reorganization (i.e. none of
// the head blocks match), we do a binary search to find the common ancestor.
func (d *Downloader) findAncestor61(p *peer) (uint64, error) {
glog.V(logger.Debug).Infof("%v: looking for common ancestor", p)
// Request out head blocks to short circuit ancestor location
head := d.headBlock().NumberU64()
from := int64(head) - int64(MaxHashFetch)
from := int64(head) - int64(MaxHashFetch) + 1
if from < 0 {
from = 0
}
@ -422,6 +445,12 @@ func (d *Downloader) findAncestor(p *peer) (uint64, error) {
case <-d.blockCh:
// Out of bounds blocks received, ignore them
case <-d.headerCh:
// Out of bounds eth/62 block headers received, ignore them
case <-d.bodyCh:
// Out of bounds eth/62 block bodies received, ignore them
case <-timeout:
glog.V(logger.Debug).Infof("%v: head hash timeout", p)
return 0, errTimeout
@ -429,7 +458,7 @@ func (d *Downloader) findAncestor(p *peer) (uint64, error) {
}
// If the head fetch already found an ancestor, return
if !common.EmptyHash(hash) {
glog.V(logger.Debug).Infof("%v: common ancestor: #%d [%x]", p, number, hash[:4])
glog.V(logger.Debug).Infof("%v: common ancestor: #%d [%x…]", p, number, hash[:4])
return number, nil
}
// Ancestor not found, we need to binary search over our chain
@ -468,7 +497,7 @@ func (d *Downloader) findAncestor(p *peer) (uint64, error) {
break
}
if block.NumberU64() != check {
glog.V(logger.Debug).Infof("%v: non requested hash #%d [%x], instead of #%d", p, block.NumberU64(), block.Hash().Bytes()[:4], check)
glog.V(logger.Debug).Infof("%v: non requested hash #%d [%x…], instead of #%d", p, block.NumberU64(), block.Hash().Bytes()[:4], check)
return 0, errBadPeer
}
start = check
@ -476,6 +505,12 @@ func (d *Downloader) findAncestor(p *peer) (uint64, error) {
case <-d.blockCh:
// Out of bounds blocks received, ignore them
case <-d.headerCh:
// Out of bounds eth/62 block headers received, ignore them
case <-d.bodyCh:
// Out of bounds eth/62 block bodies received, ignore them
case <-timeout:
glog.V(logger.Debug).Infof("%v: search hash timeout", p)
return 0, errTimeout
@ -485,9 +520,9 @@ func (d *Downloader) findAncestor(p *peer) (uint64, error) {
return start, nil
}
// fetchHashes keeps retrieving hashes from the requested number, until no more
// fetchHashes61 keeps retrieving hashes from the requested number, until no more
// are returned, potentially throttling on the way.
func (d *Downloader) fetchHashes(p *peer, td *big.Int, from uint64) error {
func (d *Downloader) fetchHashes61(p *peer, td *big.Int, from uint64) error {
glog.V(logger.Debug).Infof("%v: downloading hashes from #%d", p, from)
// Create a timeout timer, and the associated hash fetcher
@ -510,6 +545,12 @@ func (d *Downloader) fetchHashes(p *peer, td *big.Int, from uint64) error {
case <-d.cancelCh:
return errCancelHashFetch
case <-d.headerCh:
// Out of bounds eth/62 block headers received, ignore them
case <-d.bodyCh:
// Out of bounds eth/62 block bodies received, ignore them
case hashPack := <-d.hashCh:
// Make sure the active peer is giving us the hashes
if hashPack.peerId != p.id {
@ -548,7 +589,7 @@ func (d *Downloader) fetchHashes(p *peer, td *big.Int, from uint64) error {
// Otherwise insert all the new hashes, aborting in case of junk
glog.V(logger.Detail).Infof("%v: inserting %d hashes from #%d", p, len(hashPack.hashes), from)
inserts := d.queue.Insert(hashPack.hashes, true)
inserts := d.queue.Insert61(hashPack.hashes, true)
if len(inserts) != len(hashPack.hashes) {
glog.V(logger.Debug).Infof("%v: stale hashes", p)
return errBadPeer
@ -573,10 +614,10 @@ func (d *Downloader) fetchHashes(p *peer, td *big.Int, from uint64) error {
}
}
// fetchBlocks iteratively downloads the scheduled hashes, taking any available
// fetchBlocks61 iteratively downloads the scheduled hashes, taking any available
// peers, reserving a chunk of blocks for each, waiting for delivery and also
// periodically checking for timeouts.
func (d *Downloader) fetchBlocks(from uint64) error {
func (d *Downloader) fetchBlocks61(from uint64) error {
glog.V(logger.Debug).Infof("Downloading blocks from #%d", from)
defer glog.V(logger.Debug).Infof("Block download terminated")
@ -595,24 +636,30 @@ func (d *Downloader) fetchBlocks(from uint64) error {
case <-d.cancelCh:
return errCancelBlockFetch
case <-d.headerCh:
// Out of bounds eth/62 block headers received, ignore them
case <-d.bodyCh:
// Out of bounds eth/62 block bodies received, ignore them
case blockPack := <-d.blockCh:
// If the peer was previously banned and failed to deliver it's pack
// in a reasonable time frame, ignore it's message.
if peer := d.peers.Peer(blockPack.peerId); peer != nil {
// Deliver the received chunk of blocks, and demote in case of errors
err := d.queue.Deliver(blockPack.peerId, blockPack.blocks)
err := d.queue.Deliver61(blockPack.peerId, blockPack.blocks)
switch err {
case nil:
// If no blocks were delivered, demote the peer (need the delivery above)
if len(blockPack.blocks) == 0 {
peer.Demote()
peer.SetIdle()
peer.SetIdle61()
glog.V(logger.Detail).Infof("%s: no blocks delivered", peer)
break
}
// All was successful, promote the peer and potentially start processing
peer.Promote()
peer.SetIdle()
peer.SetIdle61()
glog.V(logger.Detail).Infof("%s: delivered %d blocks", peer, len(blockPack.blocks))
go d.process()
@ -624,7 +671,7 @@ func (d *Downloader) fetchBlocks(from uint64) error {
// Peer probably timed out with its delivery but came through
// in the end, demote, but allow to to pull from this peer.
peer.Demote()
peer.SetIdle()
peer.SetIdle61()
glog.V(logger.Detail).Infof("%s: out of bound delivery", peer)
case errStaleDelivery:
@ -638,7 +685,7 @@ func (d *Downloader) fetchBlocks(from uint64) error {
default:
// Peer did something semi-useful, demote but keep it around
peer.Demote()
peer.SetIdle()
peer.SetIdle61()
glog.V(logger.Detail).Infof("%s: delivery partially failed: %v", peer, err)
go d.process()
}
@ -696,7 +743,7 @@ func (d *Downloader) fetchBlocks(from uint64) error {
// Reserve a chunk of hashes for a peer. A nil can mean either that
// no more hashes are available, or that the peer is known not to
// have them.
request := d.queue.Reserve(peer, peer.Capacity())
request := d.queue.Reserve61(peer, peer.Capacity())
if request == nil {
continue
}
@ -704,7 +751,7 @@ func (d *Downloader) fetchBlocks(from uint64) error {
glog.Infof("%s: requesting %d blocks", peer, len(request.Hashes))
}
// Fetch the chunk and make sure any errors return the hashes to the queue
if err := peer.Fetch(request); err != nil {
if err := peer.Fetch61(request); err != nil {
glog.V(logger.Error).Infof("%v: fetch failed, rescheduling", peer)
d.queue.Cancel(request)
}
@ -718,6 +765,401 @@ func (d *Downloader) fetchBlocks(from uint64) error {
}
}
// findAncestor tries to locate the common ancestor block of the local chain and
// a remote peers blockchain. In the general case when our node was in sync and
// on the correct chain, checking the top N blocks should already get us a match.
// In the rare scenario when we ended up on a long reorganization (i.e. none of
// the head blocks match), we do a binary search to find the common ancestor.
func (d *Downloader) findAncestor(p *peer) (uint64, error) {
glog.V(logger.Debug).Infof("%v: looking for common ancestor", p)
// Request our head blocks to short circuit ancestor location
head := d.headBlock().NumberU64()
from := int64(head) - int64(MaxHeaderFetch) + 1
if from < 0 {
from = 0
}
go p.getAbsHeaders(uint64(from), MaxHeaderFetch, 0, false)
// Wait for the remote response to the head fetch
number, hash := uint64(0), common.Hash{}
timeout := time.After(hashTTL)
for finished := false; !finished; {
select {
case <-d.cancelCh:
return 0, errCancelHashFetch
case headerPack := <-d.headerCh:
// Discard anything not from the origin peer
if headerPack.peerId != p.id {
glog.V(logger.Debug).Infof("Received headers from incorrect peer(%s)", headerPack.peerId)
break
}
// Make sure the peer actually gave something valid
headers := headerPack.headers
if len(headers) == 0 {
glog.V(logger.Debug).Infof("%v: empty head header set", p)
return 0, errEmptyHeaderSet
}
// Check if a common ancestor was found
finished = true
for i := len(headers) - 1; i >= 0; i-- {
if d.hasBlock(headers[i].Hash()) {
number, hash = headers[i].Number.Uint64(), headers[i].Hash()
break
}
}
case <-d.bodyCh:
// Out of bounds block bodies received, ignore them
case <-d.hashCh:
// Out of bounds eth/61 hashes received, ignore them
case <-d.blockCh:
// Out of bounds eth/61 blocks received, ignore them
case <-timeout:
glog.V(logger.Debug).Infof("%v: head header timeout", p)
return 0, errTimeout
}
}
// If the head fetch already found an ancestor, return
if !common.EmptyHash(hash) {
glog.V(logger.Debug).Infof("%v: common ancestor: #%d [%x…]", p, number, hash[:4])
return number, nil
}
// Ancestor not found, we need to binary search over our chain
start, end := uint64(0), head
for start+1 < end {
// Split our chain interval in two, and request the hash to cross check
check := (start + end) / 2
timeout := time.After(hashTTL)
go p.getAbsHeaders(uint64(check), 1, 0, false)
// Wait until a reply arrives to this request
for arrived := false; !arrived; {
select {
case <-d.cancelCh:
return 0, errCancelHashFetch
case headerPack := <-d.headerCh:
// Discard anything not from the origin peer
if headerPack.peerId != p.id {
glog.V(logger.Debug).Infof("Received headers from incorrect peer(%s)", headerPack.peerId)
break
}
// Make sure the peer actually gave something valid
headers := headerPack.headers
if len(headers) != 1 {
glog.V(logger.Debug).Infof("%v: invalid search header set (%d)", p, len(headers))
return 0, errBadPeer
}
arrived = true
// Modify the search interval based on the response
block := d.getBlock(headers[0].Hash())
if block == nil {
end = check
break
}
if block.NumberU64() != check {
glog.V(logger.Debug).Infof("%v: non requested header #%d [%x…], instead of #%d", p, block.NumberU64(), block.Hash().Bytes()[:4], check)
return 0, errBadPeer
}
start = check
case <-d.bodyCh:
// Out of bounds block bodies received, ignore them
case <-d.hashCh:
// Out of bounds eth/61 hashes received, ignore them
case <-d.blockCh:
// Out of bounds eth/61 blocks received, ignore them
case <-timeout:
glog.V(logger.Debug).Infof("%v: search header timeout", p)
return 0, errTimeout
}
}
}
return start, nil
}
// fetchHeaders keeps retrieving headers from the requested number, until no more
// are returned, potentially throttling on the way.
func (d *Downloader) fetchHeaders(p *peer, td *big.Int, from uint64) error {
glog.V(logger.Debug).Infof("%v: downloading headers from #%d", p, from)
defer glog.V(logger.Debug).Infof("%v: header download terminated", p)
// Create a timeout timer, and the associated hash fetcher
timeout := time.NewTimer(0) // timer to dump a non-responsive active peer
<-timeout.C // timeout channel should be initially empty
defer timeout.Stop()
getHeaders := func(from uint64) {
glog.V(logger.Detail).Infof("%v: fetching %d headers from #%d", p, MaxHeaderFetch, from)
go p.getAbsHeaders(from, MaxHeaderFetch, 0, false)
timeout.Reset(headerTTL)
}
// Start pulling headers, until all are exhausted
getHeaders(from)
gotHeaders := false
for {
select {
case <-d.cancelCh:
return errCancelHeaderFetch
case <-d.hashCh:
// Out of bounds eth/61 hashes received, ignore them
case <-d.blockCh:
// Out of bounds eth/61 blocks received, ignore them
case headerPack := <-d.headerCh:
// Make sure the active peer is giving us the headers
if headerPack.peerId != p.id {
glog.V(logger.Debug).Infof("Received headers from incorrect peer (%s)", headerPack.peerId)
break
}
timeout.Stop()
// If no more headers are inbound, notify the body fetcher and return
if len(headerPack.headers) == 0 {
glog.V(logger.Debug).Infof("%v: no available headers", p)
select {
case d.processCh <- false:
case <-d.cancelCh:
}
// If no headers were retrieved at all, the peer violated it's TD promise that it had a
// better chain compared to ours. The only exception is if it's promised blocks were
// already imported by other means (e.g. fecher):
//
// R <remote peer>, L <local node>: Both at block 10
// R: Mine block 11, and propagate it to L
// L: Queue block 11 for import
// L: Notice that R's head and TD increased compared to ours, start sync
// L: Import of block 11 finishes
// L: Sync begins, and finds common ancestor at 11
// L: Request new headers up from 11 (R's TD was higher, it must have something)
// R: Nothing to give
if !gotHeaders && td.Cmp(d.headBlock().Td) > 0 {
return errStallingPeer
}
return nil
}
gotHeaders = true
// Otherwise insert all the new headers, aborting in case of junk
glog.V(logger.Detail).Infof("%v: inserting %d headers from #%d", p, len(headerPack.headers), from)
inserts := d.queue.Insert(headerPack.headers)
if len(inserts) != len(headerPack.headers) {
glog.V(logger.Debug).Infof("%v: stale headers", p)
return errBadPeer
}
// Notify the block fetcher of new headers, but stop if queue is full
cont := d.queue.Pending() < maxQueuedHeaders
select {
case d.processCh <- cont:
default:
}
if !cont {
return nil
}
// Queue not yet full, fetch the next batch
from += uint64(len(headerPack.headers))
getHeaders(from)
case <-timeout.C:
// Header retrieval timed out, consider the peer bad and drop
glog.V(logger.Debug).Infof("%v: header request timed out", p)
d.dropPeer(p.id)
// Finish the sync gracefully instead of dumping the gathered data though
select {
case d.processCh <- false:
default:
}
return nil
}
}
}
// fetchBodies iteratively downloads the scheduled block bodies, taking any
// available peers, reserving a chunk of blocks for each, waiting for delivery
// and also periodically checking for timeouts.
func (d *Downloader) fetchBodies(from uint64) error {
glog.V(logger.Debug).Infof("Downloading block bodies from #%d", from)
defer glog.V(logger.Debug).Infof("Block body download terminated")
// Create a timeout timer for scheduling expiration tasks
ticker := time.NewTicker(100 * time.Millisecond)
defer ticker.Stop()
update := make(chan struct{}, 1)
// Prepare the queue and fetch block bodies until the block header fetcher's done
d.queue.Prepare(from)
finished := false
for {
select {
case <-d.cancelCh:
return errCancelBlockFetch
case <-d.hashCh:
// Out of bounds eth/61 hashes received, ignore them
case <-d.blockCh:
// Out of bounds eth/61 blocks received, ignore them
case bodyPack := <-d.bodyCh:
// If the peer was previously banned and failed to deliver it's pack
// in a reasonable time frame, ignore it's message.
if peer := d.peers.Peer(bodyPack.peerId); peer != nil {
// Deliver the received chunk of bodies, and demote in case of errors
err := d.queue.Deliver(bodyPack.peerId, bodyPack.transactions, bodyPack.uncles)
switch err {
case nil:
// If no blocks were delivered, demote the peer (need the delivery above)
if len(bodyPack.transactions) == 0 || len(bodyPack.uncles) == 0 {
peer.Demote()
peer.SetIdle()
glog.V(logger.Detail).Infof("%s: no block bodies delivered", peer)
break
}
// All was successful, promote the peer and potentially start processing
peer.Promote()
peer.SetIdle()
glog.V(logger.Detail).Infof("%s: delivered %d:%d block bodies", peer, len(bodyPack.transactions), len(bodyPack.uncles))
go d.process()
case errInvalidChain:
// The hash chain is invalid (blocks are not ordered properly), abort
return err
case errInvalidBody:
// The peer delivered something very bad, drop immediately
glog.V(logger.Error).Infof("%s: delivered invalid block, dropping", peer)
d.dropPeer(peer.id)
case errNoFetchesPending:
// Peer probably timed out with its delivery but came through
// in the end, demote, but allow to to pull from this peer.
peer.Demote()
peer.SetIdle()
glog.V(logger.Detail).Infof("%s: out of bound delivery", peer)
case errStaleDelivery:
// Delivered something completely else than requested, usually
// caused by a timeout and delivery during a new sync cycle.
// Don't set it to idle as the original request should still be
// in flight.
peer.Demote()
glog.V(logger.Detail).Infof("%s: stale delivery", peer)
default:
// Peer did something semi-useful, demote but keep it around
peer.Demote()
peer.SetIdle()
glog.V(logger.Detail).Infof("%s: delivery partially failed: %v", peer, err)
go d.process()
}
}
// Blocks assembled, try to update the progress
select {
case update <- struct{}{}:
default:
}
case cont := <-d.processCh:
// The header fetcher sent a continuation flag, check if it's done
if !cont {
finished = true
}
// Headers arrive, try to update the progress
select {
case update <- struct{}{}:
default:
}
case <-ticker.C:
// Sanity check update the progress
select {
case update <- struct{}{}:
default:
}
case <-update:
// Short circuit if we lost all our peers
if d.peers.Len() == 0 {
return errNoPeers
}
// Check for block body request timeouts and demote the responsible peers
for _, pid := range d.queue.Expire(bodyHardTTL) {
if peer := d.peers.Peer(pid); peer != nil {
peer.Demote()
glog.V(logger.Detail).Infof("%s: block body delivery timeout", peer)
}
}
// If there's noting more to fetch, wait or terminate
if d.queue.Pending() == 0 {
if d.queue.InFlight() == 0 && finished {
glog.V(logger.Debug).Infof("Block body fetching completed")
return nil
}
break
}
// Send a download request to all idle peers, until throttled
queuedEmptyBlocks, throttled := false, false
for _, peer := range d.peers.IdlePeers() {
// Short circuit if throttling activated
if d.queue.Throttle() {
throttled = true
break
}
// Reserve a chunk of hashes for a peer. A nil can mean either that
// no more hashes are available, or that the peer is known not to
// have them.
request, process, err := d.queue.Reserve(peer, peer.Capacity())
if err != nil {
return err
}
if process {
queuedEmptyBlocks = true
go d.process()
}
if request == nil {
continue
}
if glog.V(logger.Detail) {
glog.Infof("%s: requesting %d block bodies", peer, len(request.Headers))
}
// Fetch the chunk and make sure any errors return the hashes to the queue
if d.bodyFetchHook != nil {
d.bodyFetchHook(request.Headers)
}
if err := peer.Fetch(request); err != nil {
glog.V(logger.Error).Infof("%v: fetch failed, rescheduling", peer)
d.queue.Cancel(request)
}
}
// Make sure that we have peers available for fetching. If all peers have been tried
// and all failed throw an error
if !queuedEmptyBlocks && !throttled && d.queue.InFlight() == 0 {
return errPeersUnavailable
}
}
}
}
// process takes blocks from the queue and tries to import them into the chain.
//
// The algorithmic flow is as follows:
@ -763,6 +1205,9 @@ func (d *Downloader) process() {
if len(blocks) == 0 {
return
}
if d.chainInsertHook != nil {
d.chainInsertHook(blocks)
}
// Reset the import statistics
d.importLock.Lock()
d.importStart = time.Now()
@ -796,9 +1241,31 @@ func (d *Downloader) process() {
}
}
// DeliverBlocks injects a new batch of blocks received from a remote node.
// DeliverHashes61 injects a new batch of hashes received from a remote node into
// the download schedule. This is usually invoked through the BlockHashesMsg by
// the protocol handler.
func (d *Downloader) DeliverHashes61(id string, hashes []common.Hash) error {
// Make sure the downloader is active
if atomic.LoadInt32(&d.synchronising) == 0 {
return errNoSyncActive
}
// Deliver or abort if the sync is canceled while queuing
d.cancelLock.RLock()
cancel := d.cancelCh
d.cancelLock.RUnlock()
select {
case d.hashCh <- hashPack{id, hashes}:
return nil
case <-cancel:
return errNoSyncActive
}
}
// DeliverBlocks61 injects a new batch of blocks received from a remote node.
// This is usually invoked through the BlocksMsg by the protocol handler.
func (d *Downloader) DeliverBlocks(id string, blocks []*types.Block) error {
func (d *Downloader) DeliverBlocks61(id string, blocks []*types.Block) error {
// Make sure the downloader is active
if atomic.LoadInt32(&d.synchronising) == 0 {
return errNoSyncActive
@ -817,10 +1284,9 @@ func (d *Downloader) DeliverBlocks(id string, blocks []*types.Block) error {
}
}
// DeliverHashes injects a new batch of hashes received from a remote node into
// the download schedule. This is usually invoked through the BlockHashesMsg by
// the protocol handler.
func (d *Downloader) DeliverHashes(id string, hashes []common.Hash) error {
// DeliverHeaders injects a new batch of blck headers received from a remote
// node into the download schedule.
func (d *Downloader) DeliverHeaders(id string, headers []*types.Header) error {
// Make sure the downloader is active
if atomic.LoadInt32(&d.synchronising) == 0 {
return errNoSyncActive
@ -831,7 +1297,27 @@ func (d *Downloader) DeliverHashes(id string, hashes []common.Hash) error {
d.cancelLock.RUnlock()
select {
case d.hashCh <- hashPack{id, hashes}:
case d.headerCh <- headerPack{id, headers}:
return nil
case <-cancel:
return errNoSyncActive
}
}
// DeliverBodies injects a new batch of block bodies received from a remote node.
func (d *Downloader) DeliverBodies(id string, transactions [][]*types.Transaction, uncles [][]*types.Header) error {
// Make sure the downloader is active
if atomic.LoadInt32(&d.synchronising) == 0 {
return errNoSyncActive
}
// Deliver or abort if the sync is canceled while queuing
d.cancelLock.RLock()
cancel := d.cancelCh
d.cancelLock.RUnlock()
select {
case d.bodyCh <- bodyPack{id, transactions, uncles}:
return nil
case <-cancel:

337
eth/downloader/downloader_test.go
View File

@ -27,20 +27,39 @@ import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/params"
)
var (
testdb, _ = ethdb.NewMemDatabase()
genesis = core.GenesisBlockForTesting(testdb, common.Address{}, big.NewInt(0))
testdb, _ = ethdb.NewMemDatabase()
testKey, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
testAddress = crypto.PubkeyToAddress(testKey.PublicKey)
genesis = core.GenesisBlockForTesting(testdb, testAddress, big.NewInt(1000000000))
)
// makeChain creates a chain of n blocks starting at but not including
// parent. the returned hash chain is ordered head->parent.
// makeChain creates a chain of n blocks starting at and including parent.
// the returned hash chain is ordered head->parent. In addition, every 3rd block
// contains a transaction and every 5th an uncle to allow testing correct block
// reassembly.
func makeChain(n int, seed byte, parent *types.Block) ([]common.Hash, map[common.Hash]*types.Block) {
blocks := core.GenerateChain(parent, testdb, n, func(i int, gen *core.BlockGen) {
gen.SetCoinbase(common.Address{seed})
blocks := core.GenerateChain(parent, testdb, n, func(i int, block *core.BlockGen) {
block.SetCoinbase(common.Address{seed})
// If the block number is multiple of 3, send a bonus transaction to the miner
if parent == genesis && i%3 == 0 {
tx, err := types.NewTransaction(block.TxNonce(testAddress), common.Address{seed}, big.NewInt(1000), params.TxGas, nil, nil).SignECDSA(testKey)
if err != nil {
panic(err)
}
block.AddTx(tx)
}
// If the block number is a multiple of 5, add a bonus uncle to the block
if i%5 == 0 {
block.AddUncle(&types.Header{ParentHash: block.PrevBlock(i - 1).Hash(), Number: big.NewInt(int64(i - 1))})
}
})
hashes := make([]common.Hash, n+1)
hashes[len(hashes)-1] = parent.Hash()
@ -78,8 +97,6 @@ type downloadTester struct {
ownBlocks map[common.Hash]*types.Block // Blocks belonging to the tester
peerHashes map[string][]common.Hash // Hash chain belonging to different test peers
peerBlocks map[string]map[common.Hash]*types.Block // Blocks belonging to different test peers
maxHashFetch int // Overrides the maximum number of retrieved hashes
}
// newTester creates a new downloader test mocker.
@ -156,7 +173,9 @@ func (dl *downloadTester) newPeer(id string, version int, hashes []common.Hash,
// specific delay time on processing the network packets sent to it, simulating
// potentially slow network IO.
func (dl *downloadTester) newSlowPeer(id string, version int, hashes []common.Hash, blocks map[common.Hash]*types.Block, delay time.Duration) error {
err := dl.downloader.RegisterPeer(id, version, hashes[0], dl.peerGetRelHashesFn(id, delay), dl.peerGetAbsHashesFn(id, version, delay), dl.peerGetBlocksFn(id, delay))
err := dl.downloader.RegisterPeer(id, version, hashes[0],
dl.peerGetRelHashesFn(id, delay), dl.peerGetAbsHashesFn(id, delay), dl.peerGetBlocksFn(id, delay),
nil, dl.peerGetAbsHeadersFn(id, delay), dl.peerGetBodiesFn(id, delay))
if err == nil {
// Assign the owned hashes and blocks to the peer (deep copy)
dl.peerHashes[id] = make([]common.Hash, len(hashes))
@ -184,13 +203,9 @@ func (dl *downloadTester) peerGetRelHashesFn(id string, delay time.Duration) fun
return func(head common.Hash) error {
time.Sleep(delay)
limit := MaxHashFetch
if dl.maxHashFetch > 0 {
limit = dl.maxHashFetch
}
// Gather the next batch of hashes
hashes := dl.peerHashes[id]
result := make([]common.Hash, 0, limit)
result := make([]common.Hash, 0, MaxHashFetch)
for i, hash := range hashes {
if hash == head {
i++
@ -204,7 +219,7 @@ func (dl *downloadTester) peerGetRelHashesFn(id string, delay time.Duration) fun
// Delay delivery a bit to allow attacks to unfold
go func() {
time.Sleep(time.Millisecond)
dl.downloader.DeliverHashes(id, result)
dl.downloader.DeliverHashes61(id, result)
}()
return nil
}
@ -213,24 +228,20 @@ func (dl *downloadTester) peerGetRelHashesFn(id string, delay time.Duration) fun
// peerGetAbsHashesFn constructs a GetHashesFromNumber function associated with
// a particular peer in the download tester. The returned function can be used to
// retrieve batches of hashes from the particularly requested peer.
func (dl *downloadTester) peerGetAbsHashesFn(id string, version int, delay time.Duration) func(uint64, int) error {
func (dl *downloadTester) peerGetAbsHashesFn(id string, delay time.Duration) func(uint64, int) error {
return func(head uint64, count int) error {
time.Sleep(delay)
limit := count
if dl.maxHashFetch > 0 {
limit = dl.maxHashFetch
}
// Gather the next batch of hashes
hashes := dl.peerHashes[id]
result := make([]common.Hash, 0, limit)
for i := 0; i < limit && len(hashes)-int(head)-1-i >= 0; i++ {
result := make([]common.Hash, 0, count)
for i := 0; i < count && len(hashes)-int(head)-1-i >= 0; i++ {
result = append(result, hashes[len(hashes)-int(head)-1-i])
}
// Delay delivery a bit to allow attacks to unfold
go func() {
time.Sleep(time.Millisecond)
dl.downloader.DeliverHashes(id, result)
dl.downloader.DeliverHashes61(id, result)
}()
return nil
}
@ -249,7 +260,55 @@ func (dl *downloadTester) peerGetBlocksFn(id string, delay time.Duration) func([
result = append(result, block)
}
}
go dl.downloader.DeliverBlocks(id, result)
go dl.downloader.DeliverBlocks61(id, result)
return nil
}
}
// peerGetAbsHeadersFn constructs a GetBlockHeaders function based on a numbered
// origin; associated with a particular peer in the download tester. The returned
// function can be used to retrieve batches of headers from the particular peer.
func (dl *downloadTester) peerGetAbsHeadersFn(id string, delay time.Duration) func(uint64, int, int, bool) error {
return func(origin uint64, amount int, skip int, reverse bool) error {
time.Sleep(delay)
// Gather the next batch of hashes
hashes := dl.peerHashes[id]
blocks := dl.peerBlocks[id]
result := make([]*types.Header, 0, amount)
for i := 0; i < amount && len(hashes)-int(origin)-1-i >= 0; i++ {
if block, ok := blocks[hashes[len(hashes)-int(origin)-1-i]]; ok {
result = append(result, block.Header())
}
}
// Delay delivery a bit to allow attacks to unfold
go func() {
time.Sleep(time.Millisecond)
dl.downloader.DeliverHeaders(id, result)
}()
return nil
}
}
// peerGetBodiesFn constructs a getBlockBodies method associated with a particular
// peer in the download tester. The returned function can be used to retrieve
// batches of block bodies from the particularly requested peer.
func (dl *downloadTester) peerGetBodiesFn(id string, delay time.Duration) func([]common.Hash) error {
return func(hashes []common.Hash) error {
time.Sleep(delay)
blocks := dl.peerBlocks[id]
transactions := make([][]*types.Transaction, 0, len(hashes))
uncles := make([][]*types.Header, 0, len(hashes))
for _, hash := range hashes {
if block, ok := blocks[hash]; ok {
transactions = append(transactions, block.Transactions())
uncles = append(uncles, block.Uncles())
}
}
go dl.downloader.DeliverBodies(id, transactions, uncles)
return nil
}
@ -258,13 +317,18 @@ func (dl *downloadTester) peerGetBlocksFn(id string, delay time.Duration) func([
// Tests that simple synchronization against a canonical chain works correctly.
// In this test common ancestor lookup should be short circuited and not require
// binary searching.
func TestCanonicalSynchronisation61(t *testing.T) {
func TestCanonicalSynchronisation61(t *testing.T) { testCanonicalSynchronisation(t, 61) }
func TestCanonicalSynchronisation62(t *testing.T) { testCanonicalSynchronisation(t, 62) }
func TestCanonicalSynchronisation63(t *testing.T) { testCanonicalSynchronisation(t, 63) }
func TestCanonicalSynchronisation64(t *testing.T) { testCanonicalSynchronisation(t, 64) }
func testCanonicalSynchronisation(t *testing.T, protocol int) {
// Create a small enough block chain to download
targetBlocks := blockCacheLimit - 15
hashes, blocks := makeChain(targetBlocks, 0, genesis)
tester := newTester()
tester.newPeer("peer", eth61, hashes, blocks)
tester.newPeer("peer", protocol, hashes, blocks)
// Synchronise with the peer and make sure all blocks were retrieved
if err := tester.sync("peer", nil); err != nil {
@ -277,7 +341,10 @@ func TestCanonicalSynchronisation61(t *testing.T) {
// Tests that if a large batch of blocks are being downloaded, it is throttled
// until the cached blocks are retrieved.
func TestThrottling61(t *testing.T) { testThrottling(t, eth61) }
func TestThrottling61(t *testing.T) { testThrottling(t, 61) }
func TestThrottling62(t *testing.T) { testThrottling(t, 62) }
func TestThrottling63(t *testing.T) { testThrottling(t, 63) }
func TestThrottling64(t *testing.T) { testThrottling(t, 64) }
func testThrottling(t *testing.T, protocol int) {
// Create a long block chain to download and the tester
@ -288,11 +355,10 @@ func testThrottling(t *testing.T, protocol int) {
tester.newPeer("peer", protocol, hashes, blocks)
// Wrap the importer to allow stepping
done := make(chan int)
tester.downloader.insertChain = func(blocks types.Blocks) (int, error) {
n, err := tester.insertChain(blocks)
done <- n
return n, err
blocked, proceed := uint32(0), make(chan struct{})
tester.downloader.chainInsertHook = func(blocks []*Block) {
atomic.StoreUint32(&blocked, uint32(len(blocks)))
<-proceed
}
// Start a synchronisation concurrently
errc := make(chan error)
@ -303,27 +369,25 @@ func testThrottling(t *testing.T, protocol int) {
for len(tester.ownBlocks) < targetBlocks+1 {
// Wait a bit for sync to throttle itself
var cached int
for start := time.Now(); time.Since(start) < 3*time.Second; {
for start := time.Now(); time.Since(start) < time.Second; {
time.Sleep(25 * time.Millisecond)
cached = len(tester.downloader.queue.blockPool)
if cached == blockCacheLimit || len(tester.ownBlocks)+cached == targetBlocks+1 {
if cached == blockCacheLimit || len(tester.ownBlocks)+cached+int(atomic.LoadUint32(&blocked)) == targetBlocks+1 {
break
}
}
// Make sure we filled up the cache, then exhaust it
time.Sleep(25 * time.Millisecond) // give it a chance to screw up
if cached != blockCacheLimit && len(tester.ownBlocks)+cached < targetBlocks+1 {
t.Fatalf("block count mismatch: have %v, want %v", cached, blockCacheLimit)
if cached != blockCacheLimit && len(tester.ownBlocks)+cached+int(atomic.LoadUint32(&blocked)) != targetBlocks+1 {
t.Fatalf("block count mismatch: have %v, want %v (owned %v, target %v)", cached, blockCacheLimit, len(tester.ownBlocks), targetBlocks+1)
}
<-done // finish previous blocking import
for cached > maxBlockProcess {
cached -= <-done
// Permit the blocked blocks to import
if atomic.LoadUint32(&blocked) > 0 {
atomic.StoreUint32(&blocked, uint32(0))
proceed <- struct{}{}
}
time.Sleep(25 * time.Millisecond) // yield to the insertion
}
<-done // finish the last blocking import
// Check that we haven't pulled more blocks than available
if len(tester.ownBlocks) > targetBlocks+1 {
t.Fatalf("target block count mismatch: have %v, want %v", len(tester.ownBlocks), targetBlocks+1)
@ -336,14 +400,19 @@ func testThrottling(t *testing.T, protocol int) {
// Tests that simple synchronization against a forked chain works correctly. In
// this test common ancestor lookup should *not* be short circuited, and a full
// binary search should be executed.
func TestForkedSynchronisation61(t *testing.T) {
func TestForkedSynchronisation61(t *testing.T) { testForkedSynchronisation(t, 61) }
func TestForkedSynchronisation62(t *testing.T) { testForkedSynchronisation(t, 62) }
func TestForkedSynchronisation63(t *testing.T) { testForkedSynchronisation(t, 63) }
func TestForkedSynchronisation64(t *testing.T) { testForkedSynchronisation(t, 64) }
func testForkedSynchronisation(t *testing.T, protocol int) {
// Create a long enough forked chain
common, fork := MaxHashFetch, 2*MaxHashFetch
hashesA, hashesB, blocksA, blocksB := makeChainFork(common+fork, fork, genesis)
tester := newTester()
tester.newPeer("fork A", eth61, hashesA, blocksA)
tester.newPeer("fork B", eth61, hashesB, blocksB)
tester.newPeer("fork A", protocol, hashesA, blocksA)
tester.newPeer("fork B", protocol, hashesB, blocksB)
// Synchronise with the peer and make sure all blocks were retrieved
if err := tester.sync("fork A", nil); err != nil {
@ -362,20 +431,36 @@ func TestForkedSynchronisation61(t *testing.T) {
}
// Tests that an inactive downloader will not accept incoming hashes and blocks.
func TestInactiveDownloader(t *testing.T) {
func TestInactiveDownloader61(t *testing.T) {
tester := newTester()
// Check that neither hashes nor blocks are accepted
if err := tester.downloader.DeliverHashes("bad peer", []common.Hash{}); err != errNoSyncActive {
if err := tester.downloader.DeliverHashes61("bad peer", []common.Hash{}); err != errNoSyncActive {
t.Errorf("error mismatch: have %v, want %v", err, errNoSyncActive)
}
if err := tester.downloader.DeliverBlocks("bad peer", []*types.Block{}); err != errNoSyncActive {
if err := tester.downloader.DeliverBlocks61("bad peer", []*types.Block{}); err != errNoSyncActive {
t.Errorf("error mismatch: have %v, want %v", err, errNoSyncActive)
}
}
// Tests that an inactive downloader will not accept incoming block headers and bodies.
func TestInactiveDownloader62(t *testing.T) {
tester := newTester()
// Check that neither block headers nor bodies are accepted
if err := tester.downloader.DeliverHeaders("bad peer", []*types.Header{}); err != errNoSyncActive {
t.Errorf("error mismatch: have %v, want %v", err, errNoSyncActive)
}
if err := tester.downloader.DeliverBodies("bad peer", [][]*types.Transaction{}, [][]*types.Header{}); err != errNoSyncActive {
t.Errorf("error mismatch: have %v, want %v", err, errNoSyncActive)
}
}
// Tests that a canceled download wipes all previously accumulated state.
func TestCancel61(t *testing.T) { testCancel(t, eth61) }
func TestCancel61(t *testing.T) { testCancel(t, 61) }
func TestCancel62(t *testing.T) { testCancel(t, 62) }
func TestCancel63(t *testing.T) { testCancel(t, 63) }
func TestCancel64(t *testing.T) { testCancel(t, 64) }
func testCancel(t *testing.T, protocol int) {
// Create a small enough block chain to download and the tester
@ -383,6 +468,9 @@ func testCancel(t *testing.T, protocol int) {
if targetBlocks >= MaxHashFetch {
targetBlocks = MaxHashFetch - 15
}
if targetBlocks >= MaxHeaderFetch {
targetBlocks = MaxHeaderFetch - 15
}
hashes, blocks := makeChain(targetBlocks, 0, genesis)
tester := newTester()
@ -390,27 +478,30 @@ func testCancel(t *testing.T, protocol int) {
// Make sure canceling works with a pristine downloader
tester.downloader.cancel()
hashCount, blockCount := tester.downloader.queue.Size()
if hashCount > 0 || blockCount > 0 {
t.Errorf("block or hash count mismatch: %d hashes, %d blocks, want 0", hashCount, blockCount)
downloading, importing := tester.downloader.queue.Size()
if downloading > 0 || importing > 0 {
t.Errorf("download or import count mismatch: %d downloading, %d importing, want 0", downloading, importing)
}
// Synchronise with the peer, but cancel afterwards
if err := tester.sync("peer", nil); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
tester.downloader.cancel()
hashCount, blockCount = tester.downloader.queue.Size()
if hashCount > 0 || blockCount > 0 {
t.Errorf("block or hash count mismatch: %d hashes, %d blocks, want 0", hashCount, blockCount)
downloading, importing = tester.downloader.queue.Size()
if downloading > 0 || importing > 0 {
t.Errorf("download or import count mismatch: %d downloading, %d importing, want 0", downloading, importing)
}
}
// Tests that synchronisation from multiple peers works as intended (multi thread sanity test).
func TestMultiSynchronisation61(t *testing.T) { testMultiSynchronisation(t, eth61) }
func TestMultiSynchronisation61(t *testing.T) { testMultiSynchronisation(t, 61) }
func TestMultiSynchronisation62(t *testing.T) { testMultiSynchronisation(t, 62) }
func TestMultiSynchronisation63(t *testing.T) { testMultiSynchronisation(t, 63) }
func TestMultiSynchronisation64(t *testing.T) { testMultiSynchronisation(t, 64) }
func testMultiSynchronisation(t *testing.T, protocol int) {
// Create various peers with various parts of the chain
targetPeers := 16
targetPeers := 8
targetBlocks := targetPeers*blockCacheLimit - 15
hashes, blocks := makeChain(targetBlocks, 0, genesis)
@ -436,45 +527,130 @@ func testMultiSynchronisation(t *testing.T, protocol int) {
}
}
// Tests that if a block is empty (i.e. header only), no body request should be
// made, and instead the header should be assembled into a whole block in itself.
func TestEmptyBlockShortCircuit62(t *testing.T) { testEmptyBlockShortCircuit(t, 62) }
func TestEmptyBlockShortCircuit63(t *testing.T) { testEmptyBlockShortCircuit(t, 63) }
func TestEmptyBlockShortCircuit64(t *testing.T) { testEmptyBlockShortCircuit(t, 64) }
func testEmptyBlockShortCircuit(t *testing.T, protocol int) {
// Create a small enough block chain to download
targetBlocks := blockCacheLimit - 15
hashes, blocks := makeChain(targetBlocks, 0, genesis)
tester := newTester()
tester.newPeer("peer", protocol, hashes, blocks)
// Instrument the downloader to signal body requests
requested := int32(0)
tester.downloader.bodyFetchHook = func(headers []*types.Header) {
atomic.AddInt32(&requested, int32(len(headers)))
}
// Synchronise with the peer and make sure all blocks were retrieved
if err := tester.sync("peer", nil); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
if imported := len(tester.ownBlocks); imported != targetBlocks+1 {
t.Fatalf("synchronised block mismatch: have %v, want %v", imported, targetBlocks+1)
}
// Validate the number of block bodies that should have been requested
needed := 0
for _, block := range blocks {
if block != genesis && (len(block.Transactions()) > 0 || len(block.Uncles()) > 0) {
needed++
}
}
if int(requested) != needed {
t.Fatalf("block body retrieval count mismatch: have %v, want %v", requested, needed)
}
}
// Tests that if a peer sends an invalid body for a requested block, it gets
// dropped immediately by the downloader.
func TestInvalidBlockBodyAttack62(t *testing.T) { testInvalidBlockBodyAttack(t, 62) }
func TestInvalidBlockBodyAttack63(t *testing.T) { testInvalidBlockBodyAttack(t, 63) }
func TestInvalidBlockBodyAttack64(t *testing.T) { testInvalidBlockBodyAttack(t, 64) }
func testInvalidBlockBodyAttack(t *testing.T, protocol int) {
// Create two peers, one feeding invalid block bodies
targetBlocks := 4*blockCacheLimit - 15
hashes, validBlocks := makeChain(targetBlocks, 0, genesis)
invalidBlocks := make(map[common.Hash]*types.Block)
for hash, block := range validBlocks {
invalidBlocks[hash] = types.NewBlockWithHeader(block.Header())
}
tester := newTester()
tester.newPeer("valid", protocol, hashes, validBlocks)
tester.newPeer("attack", protocol, hashes, invalidBlocks)
// Synchronise with the valid peer (will pull contents from the attacker too)
if err := tester.sync("valid", nil); err != nil {
t.Fatalf("failed to synchronise blocks: %v", err)
}
if imported := len(tester.ownBlocks); imported != len(hashes) {
t.Fatalf("synchronised block mismatch: have %v, want %v", imported, len(hashes))
}
// Make sure the attacker was detected and dropped in the mean time
if _, ok := tester.peerHashes["attack"]; ok {
t.Fatalf("block body attacker not detected/dropped")
}
}
// Tests that a peer advertising an high TD doesn't get to stall the downloader
// afterwards by not sending any useful hashes.
func TestHighTDStarvationAttack61(t *testing.T) {
func TestHighTDStarvationAttack61(t *testing.T) { testHighTDStarvationAttack(t, 61) }
func TestHighTDStarvationAttack62(t *testing.T) { testHighTDStarvationAttack(t, 62) }
func TestHighTDStarvationAttack63(t *testing.T) { testHighTDStarvationAttack(t, 63) }
func TestHighTDStarvationAttack64(t *testing.T) { testHighTDStarvationAttack(t, 64) }
func testHighTDStarvationAttack(t *testing.T, protocol int) {
tester := newTester()
tester.newPeer("attack", eth61, []common.Hash{genesis.Hash()}, nil)
hashes, blocks := makeChain(0, 0, genesis)
tester.newPeer("attack", protocol, []common.Hash{hashes[0]}, blocks)
if err := tester.sync("attack", big.NewInt(1000000)); err != errStallingPeer {
t.Fatalf("synchronisation error mismatch: have %v, want %v", err, errStallingPeer)
}
}
// Tests that misbehaving peers are disconnected, whilst behaving ones are not.
func TestHashAttackerDropping(t *testing.T) {
func TestBlockHeaderAttackerDropping61(t *testing.T) { testBlockHeaderAttackerDropping(t, 61) }
func TestBlockHeaderAttackerDropping62(t *testing.T) { testBlockHeaderAttackerDropping(t, 62) }
func TestBlockHeaderAttackerDropping63(t *testing.T) { testBlockHeaderAttackerDropping(t, 63) }
func TestBlockHeaderAttackerDropping64(t *testing.T) { testBlockHeaderAttackerDropping(t, 64) }
func testBlockHeaderAttackerDropping(t *testing.T, protocol int) {
// Define the disconnection requirement for individual hash fetch errors
tests := []struct {
result error
drop bool
}{
{nil, false}, // Sync succeeded, all is well
{errBusy, false}, // Sync is already in progress, no problem
{errUnknownPeer, false}, // Peer is unknown, was already dropped, don't double drop
{errBadPeer, true}, // Peer was deemed bad for some reason, drop it
{errStallingPeer, true}, // Peer was detected to be stalling, drop it
{errBannedHead, true}, // Peer's head hash is a known bad hash, drop it
{errNoPeers, false}, // No peers to download from, soft race, no issue
{errPendingQueue, false}, // There are blocks still cached, wait to exhaust, no issue
{errTimeout, true}, // No hashes received in due time, drop the peer
{errEmptyHashSet, true}, // No hashes were returned as a response, drop as it's a dead end
{errPeersUnavailable, true}, // Nobody had the advertised blocks, drop the advertiser
{errInvalidChain, true}, // Hash chain was detected as invalid, definitely drop
{errCrossCheckFailed, true}, // Hash-origin failed to pass a block cross check, drop
{errCancelHashFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
{errCancelBlockFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
{nil, false}, // Sync succeeded, all is well
{errBusy, false}, // Sync is already in progress, no problem
{errUnknownPeer, false}, // Peer is unknown, was already dropped, don't double drop
{errBadPeer, true}, // Peer was deemed bad for some reason, drop it
{errStallingPeer, true}, // Peer was detected to be stalling, drop it
{errNoPeers, false}, // No peers to download from, soft race, no issue
{errPendingQueue, false}, // There are blocks still cached, wait to exhaust, no issue
{errTimeout, true}, // No hashes received in due time, drop the peer
{errEmptyHashSet, true}, // No hashes were returned as a response, drop as it's a dead end
{errEmptyHeaderSet, true}, // No headers were returned as a response, drop as it's a dead end
{errPeersUnavailable, true}, // Nobody had the advertised blocks, drop the advertiser
{errInvalidChain, true}, // Hash chain was detected as invalid, definitely drop
{errInvalidBody, false}, // A bad peer was detected, but not the sync origin
{errCancelHashFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
{errCancelBlockFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
{errCancelHeaderFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
{errCancelBodyFetch, false}, // Synchronisation was canceled, origin may be innocent, don't drop
}
// Run the tests and check disconnection status
tester := newTester()
for i, tt := range tests {
// Register a new peer and ensure it's presence
id := fmt.Sprintf("test %d", i)
if err := tester.newPeer(id, eth61, []common.Hash{genesis.Hash()}, nil); err != nil {
if err := tester.newPeer(id, protocol, []common.Hash{genesis.Hash()}, nil); err != nil {
t.Fatalf("test %d: failed to register new peer: %v", i, err)
}
if _, ok := tester.peerHashes[id]; !ok {
@ -491,7 +667,12 @@ func TestHashAttackerDropping(t *testing.T) {
}
// Tests that feeding bad blocks will result in a peer drop.
func TestBlockAttackerDropping(t *testing.T) {
func TestBlockBodyAttackerDropping61(t *testing.T) { testBlockBodyAttackerDropping(t, 61) }
func TestBlockBodyAttackerDropping62(t *testing.T) { testBlockBodyAttackerDropping(t, 62) }
func TestBlockBodyAttackerDropping63(t *testing.T) { testBlockBodyAttackerDropping(t, 63) }
func TestBlockBodyAttackerDropping64(t *testing.T) { testBlockBodyAttackerDropping(t, 64) }
func testBlockBodyAttackerDropping(t *testing.T, protocol int) {
// Define the disconnection requirement for individual block import errors
tests := []struct {
failure bool
@ -506,7 +687,7 @@ func TestBlockAttackerDropping(t *testing.T) {
for i, tt := range tests {
// Register a new peer and ensure it's presence
id := fmt.Sprintf("test %d", i)
if err := tester.newPeer(id, eth61, []common.Hash{common.Hash{}}, nil); err != nil {
if err := tester.newPeer(id, protocol, []common.Hash{common.Hash{}}, nil); err != nil {
t.Fatalf("test %d: failed to register new peer: %v", i, err)
}
if _, ok := tester.peerHashes[id]; !ok {

92
eth/downloader/peer.go
View File

@ -31,10 +31,16 @@ import (
"gopkg.in/fatih/set.v0"
)
// Hash and block fetchers belonging to eth/61 and below
type relativeHashFetcherFn func(common.Hash) error
type absoluteHashFetcherFn func(uint64, int) error
type blockFetcherFn func([]common.Hash) error
// Block header and body fethers belonging to eth/62 and above
type relativeHeaderFetcherFn func(common.Hash, int, int, bool) error
type absoluteHeaderFetcherFn func(uint64, int, int, bool) error
type blockBodyFetcherFn func([]common.Hash) error
var (
errAlreadyFetching = errors.New("already fetching blocks from peer")
errAlreadyRegistered = errors.New("peer is already registered")
@ -54,25 +60,37 @@ type peer struct {
ignored *set.Set // Set of hashes not to request (didn't have previously)
getRelHashes relativeHashFetcherFn // Method to retrieve a batch of hashes from an origin hash
getAbsHashes absoluteHashFetcherFn // Method to retrieve a batch of hashes from an absolute position
getBlocks blockFetcherFn // Method to retrieve a batch of blocks
getRelHashes relativeHashFetcherFn // [eth/61] Method to retrieve a batch of hashes from an origin hash
getAbsHashes absoluteHashFetcherFn // [eth/61] Method to retrieve a batch of hashes from an absolute position
getBlocks blockFetcherFn // [eth/61] Method to retrieve a batch of blocks
getRelHeaders relativeHeaderFetcherFn // [eth/62] Method to retrieve a batch of headers from an origin hash
getAbsHeaders absoluteHeaderFetcherFn // [eth/62] Method to retrieve a batch of headers from an absolute position
getBlockBodies blockBodyFetcherFn // [eth/62] Method to retrieve a batch of block bodies
version int // Eth protocol version number to switch strategies
}
// newPeer create a new downloader peer, with specific hash and block retrieval
// mechanisms.
func newPeer(id string, version int, head common.Hash, getRelHashes relativeHashFetcherFn, getAbsHashes absoluteHashFetcherFn, getBlocks blockFetcherFn) *peer {
func newPeer(id string, version int, head common.Hash,
getRelHashes relativeHashFetcherFn, getAbsHashes absoluteHashFetcherFn, getBlocks blockFetcherFn, // eth/61 callbacks, remove when upgrading
getRelHeaders relativeHeaderFetcherFn, getAbsHeaders absoluteHeaderFetcherFn, getBlockBodies blockBodyFetcherFn) *peer {
return &peer{
id: id,
head: head,
capacity: 1,
id: id,
head: head,
capacity: 1,
ignored: set.New(),
getRelHashes: getRelHashes,
getAbsHashes: getAbsHashes,
getBlocks: getBlocks,
ignored: set.New(),
version: version,
getRelHeaders: getRelHeaders,
getAbsHeaders: getAbsHeaders,
getBlockBodies: getBlockBodies,
version: version,
}
}
@ -83,8 +101,8 @@ func (p *peer) Reset() {
p.ignored.Clear()
}
// Fetch sends a block retrieval request to the remote peer.
func (p *peer) Fetch(request *fetchRequest) error {
// Fetch61 sends a block retrieval request to the remote peer.
func (p *peer) Fetch61(request *fetchRequest) error {
// Short circuit if the peer is already fetching
if !atomic.CompareAndSwapInt32(&p.idle, 0, 1) {
return errAlreadyFetching
@ -101,10 +119,28 @@ func (p *peer) Fetch(request *fetchRequest) error {
return nil
}
// SetIdle sets the peer to idle, allowing it to execute new retrieval requests.
// Fetch sends a block body retrieval request to the remote peer.
func (p *peer) Fetch(request *fetchRequest) error {
// Short circuit if the peer is already fetching
if !atomic.CompareAndSwapInt32(&p.idle, 0, 1) {
return errAlreadyFetching
}
p.started = time.Now()
// Convert the header set to a retrievable slice
hashes := make([]common.Hash, 0, len(request.Headers))
for _, header := range request.Headers {
hashes = append(hashes, header.Hash())
}
go p.getBlockBodies(hashes)
return nil
}
// SetIdle61 sets the peer to idle, allowing it to execute new retrieval requests.
// Its block retrieval allowance will also be updated either up- or downwards,
// depending on whether the previous fetch completed in time or not.
func (p *peer) SetIdle() {
func (p *peer) SetIdle61() {
// Update the peer's download allowance based on previous performance
scale := 2.0
if time.Since(p.started) > blockSoftTTL {
@ -131,6 +167,36 @@ func (p *peer) SetIdle() {
atomic.StoreInt32(&p.idle, 0)
}
// SetIdle sets the peer to idle, allowing it to execute new retrieval requests.
// Its block body retrieval allowance will also be updated either up- or downwards,
// depending on whether the previous fetch completed in time or not.
func (p *peer) SetIdle() {
// Update the peer's download allowance based on previous performance
scale := 2.0
if time.Since(p.started) > bodySoftTTL {
scale = 0.5
if time.Since(p.started) > bodyHardTTL {
scale = 1 / float64(MaxBodyFetch) // reduces capacity to 1
}
}
for {
// Calculate the new download bandwidth allowance
prev := atomic.LoadInt32(&p.capacity)
next := int32(math.Max(1, math.Min(float64(MaxBodyFetch), float64(prev)*scale)))
// Try to update the old value
if atomic.CompareAndSwapInt32(&p.capacity, prev, next) {
// If we're having problems at 1 capacity, try to find better peers
if next == 1 {
p.Demote()
}
break
}
}
// Set the peer to idle to allow further block requests
atomic.StoreInt32(&p.idle, 0)
}
// Capacity retrieves the peers block download allowance based on its previously
// discovered bandwidth capacity.
func (p *peer) Capacity() int {

239
eth/downloader/queue.go
View File

@ -43,16 +43,20 @@ var (
// fetchRequest is a currently running block retrieval operation.
type fetchRequest struct {
Peer *peer // Peer to which the request was sent
Hashes map[common.Hash]int // Requested hashes with their insertion index (priority)
Time time.Time // Time when the request was made
Peer *peer // Peer to which the request was sent
Hashes map[common.Hash]int // [eth/61] Requested hashes with their insertion index (priority)
Headers []*types.Header // [eth/62] Requested headers, sorted by request order
Time time.Time // Time when the request was made
}
// queue represents hashes that are either need fetching or are being fetched
type queue struct {
hashPool map[common.Hash]int // Pending hashes, mapping to their insertion index (priority)
hashQueue *prque.Prque // Priority queue of the block hashes to fetch
hashCounter int // Counter indexing the added hashes to ensure retrieval order
hashPool map[common.Hash]int // [eth/61] Pending hashes, mapping to their insertion index (priority)
hashQueue *prque.Prque // [eth/61] Priority queue of the block hashes to fetch
hashCounter int // [eth/61] Counter indexing the added hashes to ensure retrieval order
headerPool map[common.Hash]*types.Header // [eth/62] Pending headers, mapping from their hashes
headerQueue *prque.Prque // [eth/62] Priority queue of the headers to fetch the bodies for
pendPool map[string]*fetchRequest // Currently pending block retrieval operations
@ -66,11 +70,13 @@ type queue struct {
// newQueue creates a new download queue for scheduling block retrieval.
func newQueue() *queue {
return &queue{
hashPool: make(map[common.Hash]int),
hashQueue: prque.New(),
pendPool: make(map[string]*fetchRequest),
blockPool: make(map[common.Hash]uint64),
blockCache: make([]*Block, blockCacheLimit),
hashPool: make(map[common.Hash]int),
hashQueue: prque.New(),
headerPool: make(map[common.Hash]*types.Header),
headerQueue: prque.New(),
pendPool: make(map[string]*fetchRequest),
blockPool: make(map[common.Hash]uint64),
blockCache: make([]*Block, blockCacheLimit),
}
}
@ -83,6 +89,9 @@ func (q *queue) Reset() {
q.hashQueue.Reset()
q.hashCounter = 0
q.headerPool = make(map[common.Hash]*types.Header)
q.headerQueue.Reset()
q.pendPool = make(map[string]*fetchRequest)
q.blockPool = make(map[common.Hash]uint64)
@ -90,21 +99,21 @@ func (q *queue) Reset() {
q.blockCache = make([]*Block, blockCacheLimit)
}
// Size retrieves the number of hashes in the queue, returning separately for
// Size retrieves the number of blocks in the queue, returning separately for
// pending and already downloaded.
func (q *queue) Size() (int, int) {
q.lock.RLock()
defer q.lock.RUnlock()
return len(q.hashPool), len(q.blockPool)
return len(q.hashPool) + len(q.headerPool), len(q.blockPool)
}
// Pending retrieves the number of hashes pending for retrieval.
// Pending retrieves the number of blocks pending for retrieval.
func (q *queue) Pending() int {
q.lock.RLock()
defer q.lock.RUnlock()
return q.hashQueue.Size()
return q.hashQueue.Size() + q.headerQueue.Size()
}
// InFlight retrieves the number of fetch requests currently in flight.
@ -124,7 +133,7 @@ func (q *queue) Throttle() bool {
// Calculate the currently in-flight block requests
pending := 0
for _, request := range q.pendPool {
pending += len(request.Hashes)
pending += len(request.Hashes) + len(request.Headers)
}
// Throttle if more blocks are in-flight than free space in the cache
return pending >= len(q.blockCache)-len(q.blockPool)
@ -138,15 +147,18 @@ func (q *queue) Has(hash common.Hash) bool {
if _, ok := q.hashPool[hash]; ok {
return true
}
if _, ok := q.headerPool[hash]; ok {
return true
}
if _, ok := q.blockPool[hash]; ok {
return true
}
return false
}
// Insert adds a set of hashes for the download queue for scheduling, returning
// Insert61 adds a set of hashes for the download queue for scheduling, returning
// the new hashes encountered.
func (q *queue) Insert(hashes []common.Hash, fifo bool) []common.Hash {
func (q *queue) Insert61(hashes []common.Hash, fifo bool) []common.Hash {
q.lock.Lock()
defer q.lock.Unlock()
@ -172,6 +184,29 @@ func (q *queue) Insert(hashes []common.Hash, fifo bool) []common.Hash {
return inserts
}
// Insert adds a set of headers for the download queue for scheduling, returning
// the new headers encountered.
func (q *queue) Insert(headers []*types.Header) []*types.Header {
q.lock.Lock()
defer q.lock.Unlock()
// Insert all the headers prioritized by the contained block number
inserts := make([]*types.Header, 0, len(headers))
for _, header := range headers {
// Make sure no duplicate requests are executed
hash := header.Hash()
if _, ok := q.headerPool[hash]; ok {
glog.V(logger.Warn).Infof("Header %x already scheduled", hash)
continue
}
// Queue the header for body retrieval
inserts = append(inserts, header)
q.headerPool[hash] = header
q.headerQueue.Push(header, -float32(header.Number.Uint64()))
}
return inserts
}
// GetHeadBlock retrieves the first block from the cache, or nil if it hasn't
// been downloaded yet (or simply non existent).
func (q *queue) GetHeadBlock() *Block {
@ -227,9 +262,9 @@ func (q *queue) TakeBlocks() []*Block {
return blocks
}
// Reserve reserves a set of hashes for the given peer, skipping any previously
// Reserve61 reserves a set of hashes for the given peer, skipping any previously
// failed download.
func (q *queue) Reserve(p *peer, count int) *fetchRequest {
func (q *queue) Reserve61(p *peer, count int) *fetchRequest {
q.lock.Lock()
defer q.lock.Unlock()
@ -276,6 +311,68 @@ func (q *queue) Reserve(p *peer, count int) *fetchRequest {
return request
}
// Reserve reserves a set of headers for the given peer, skipping any previously
// failed download. Beside the next batch of needed fetches, it also returns a
// flag whether empty blocks were queued requiring processing.
func (q *queue) Reserve(p *peer, count int) (*fetchRequest, bool, error) {
q.lock.Lock()
defer q.lock.Unlock()
// Short circuit if the pool has been depleted, or if the peer's already
// downloading something (sanity check not to corrupt state)
if q.headerQueue.Empty() {
return nil, false, nil
}
if _, ok := q.pendPool[p.id]; ok {
return nil, false, nil
}
// Calculate an upper limit on the bodies we might fetch (i.e. throttling)
space := len(q.blockCache) - len(q.blockPool)
for _, request := range q.pendPool {
space -= len(request.Headers)
}
// Retrieve a batch of headers, skipping previously failed ones
send := make([]*types.Header, 0, count)
skip := make([]*types.Header, 0)
process := false
for proc := 0; proc < space && len(send) < count && !q.headerQueue.Empty(); proc++ {
header := q.headerQueue.PopItem().(*types.Header)
// If the header defines an empty block, deliver straight
if header.TxHash == types.DeriveSha(types.Transactions{}) && header.UncleHash == types.CalcUncleHash([]*types.Header{}) {
if err := q.enqueue("", types.NewBlockWithHeader(header)); err != nil {
return nil, false, errInvalidChain
}
delete(q.headerPool, header.Hash())
process, space, proc = true, space-1, proc-1
continue
}
// If it's a content block, add to the body fetch request
if p.ignored.Has(header.Hash()) {
skip = append(skip, header)
} else {
send = append(send, header)
}
}
// Merge all the skipped headers back
for _, header := range skip {
q.headerQueue.Push(header, -float32(header.Number.Uint64()))
}
// Assemble and return the block download request
if len(send) == 0 {
return nil, process, nil
}
request := &fetchRequest{
Peer: p,
Headers: send,
Time: time.Now(),
}
q.pendPool[p.id] = request
return request, process, nil
}
// Cancel aborts a fetch request, returning all pending hashes to the queue.
func (q *queue) Cancel(request *fetchRequest) {
q.lock.Lock()
@ -284,6 +381,9 @@ func (q *queue) Cancel(request *fetchRequest) {
for hash, index := range request.Hashes {
q.hashQueue.Push(hash, float32(index))
}
for _, header := range request.Headers {
q.headerQueue.Push(header, -float32(header.Number.Uint64()))
}
delete(q.pendPool, request.Peer.id)
}
@ -310,8 +410,8 @@ func (q *queue) Expire(timeout time.Duration) []string {
return peers
}
// Deliver injects a block retrieval response into the download queue.
func (q *queue) Deliver(id string, blocks []*types.Block) (err error) {
// Deliver61 injects a block retrieval response into the download queue.
func (q *queue) Deliver61(id string, blocks []*types.Block) (err error) {
q.lock.Lock()
defer q.lock.Unlock()
@ -337,19 +437,12 @@ func (q *queue) Deliver(id string, blocks []*types.Block) (err error) {
errs = append(errs, fmt.Errorf("non-requested block %x", hash))
continue
}
// If a requested block falls out of the range, the hash chain is invalid
index := int(int64(block.NumberU64()) - int64(q.blockOffset))
if index >= len(q.blockCache) || index < 0 {
return errInvalidChain
}
// Otherwise merge the block and mark the hash block
q.blockCache[index] = &Block{
RawBlock: block,
OriginPeer: id,
// Queue the block up for processing
if err := q.enqueue(id, block); err != nil {
return err
}
delete(request.Hashes, hash)
delete(q.hashPool, hash)
q.blockPool[hash] = block.NumberU64()
}
// Return all failed or missing fetches to the queue
for hash, index := range request.Hashes {
@ -365,6 +458,88 @@ func (q *queue) Deliver(id string, blocks []*types.Block) (err error) {
return nil
}
// Deliver injects a block body retrieval response into the download queue.
func (q *queue) Deliver(id string, txLists [][]*types.Transaction, uncleLists [][]*types.Header) error {
q.lock.Lock()
defer q.lock.Unlock()
// Short circuit if the block bodies were never requested
request := q.pendPool[id]
if request == nil {
return errNoFetchesPending
}
delete(q.pendPool, id)
// If no block bodies were retrieved, mark them as unavailable for the origin peer
if len(txLists) == 0 || len(uncleLists) == 0 {
for hash, _ := range request.Headers {
request.Peer.ignored.Add(hash)
}
}
// Assemble each of the block bodies with their headers and queue for processing
errs := make([]error, 0)
for i, header := range request.Headers {
// Short circuit block assembly if no more bodies are found
if i >= len(txLists) || i >= len(uncleLists) {
break
}
// Reconstruct the next block if contents match up
if types.DeriveSha(types.Transactions(txLists[i])) != header.TxHash || types.CalcUncleHash(uncleLists[i]) != header.UncleHash {
errs = []error{errInvalidBody}
break
}
block := types.NewBlockWithHeader(header).WithBody(txLists[i], uncleLists[i])
// Queue the block up for processing
if err := q.enqueue(id, block); err != nil {
errs = []error{err}
break
}
request.Headers[i] = nil
delete(q.headerPool, header.Hash())
}
// Return all failed or missing fetches to the queue
for _, header := range request.Headers {
if header != nil {
q.headerQueue.Push(header, -float32(header.Number.Uint64()))
}
}
// If none of the blocks were good, it's a stale delivery
switch {
case len(errs) == 0:
return nil
case len(errs) == 1 && errs[0] == errInvalidBody:
return errInvalidBody
case len(errs) == 1 && errs[0] == errInvalidChain:
return errInvalidChain
case len(errs) == len(request.Headers):
return errStaleDelivery
default:
return fmt.Errorf("multiple failures: %v", errs)
}
}
// enqueue inserts a new block into the final delivery queue, waiting for pickup
// by the processor.
func (q *queue) enqueue(origin string, block *types.Block) error {
// If a requested block falls out of the range, the hash chain is invalid
index := int(int64(block.NumberU64()) - int64(q.blockOffset))
if index >= len(q.blockCache) || index < 0 {
return errInvalidChain
}
// Otherwise merge the block and mark the hash done
q.blockCache[index] = &Block{
RawBlock: block,
OriginPeer: origin,
}
q.blockPool[block.Header().Hash()] = block.NumberU64()
return nil
}
// Prepare configures the block cache offset to allow accepting inbound blocks.
func (q *queue) Prepare(offset uint64) {
q.lock.Lock()