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提交 a8a2b2a4 编写于 作者: O obscuren
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downloader: added missing blocks catchup functionality 

When a parent is missing in the block list an attempt should be made to
fetch the missing parent and grandparents.
上级 7dcb9825
隐藏空白更改
内联 并排
Showing with 303 addition and 133 deletion
eth/downloader/downloader.go
浏览文件 @ a8a2b2a4
......@@ -8,63 +8,44 @@ 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/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"gopkg.in/fatih/set.v0"
)
const maxBlockFetch = 256
const (
maxBlockFetch = 256 // Amount of max blocks to be fetched per chunk
minDesiredPeerCount = 3 // Amount of peers desired to start syncing
)
type hashFetcherFn func(common.Hash) error
type blockFetcherFn func([]common.Hash) error
type hashCheckFn func(common.Hash) bool
type chainInsertFn func(types.Blocks) error
type hashIterFn func() (common.Hash, error)
// XXX make threadsafe!!!!
type peers map[string]*peer
func (p peers) get(state int) []*peer {
var peers []*peer
for _, peer := range p {
peer.mu.RLock()
if peer.state == state {
peers = append(peers, peer)
}
peer.mu.RUnlock()
}
return peers
}
func (p peers) setState(id string, state int) {
if peer, exist := p[id]; exist {
peer.mu.Lock()
defer peer.mu.Unlock()
peer.state = state
}
}
type currentTdFn func() *big.Int
type Downloader struct {
mu sync.RWMutex
queue *queue
peers peers
// Callbacks
hasBlock hashCheckFn
insertChain chainInsertFn
currentTd currentTdFn
mu sync.RWMutex
peers peers
currentPeer *peer
// Status
fetchingHashes int32
downloadingBlocks int32
newPeerCh chan *peer
selectPeerCh chan *peer
HashCh chan []common.Hash
blockCh chan blockPack
quit chan struct{}
processingBlocks int32
// Channels
newPeerCh chan *peer
syncCh chan syncPack
HashCh chan []common.Hash
blockCh chan blockPack
quit chan struct{}
}
type blockPack struct {
......@@ -72,17 +53,23 @@ type blockPack struct {
blocks []*types.Block
}
func New(hasBlock hashCheckFn, insertChain chainInsertFn) *Downloader {
type syncPack struct {
peer *peer
hash common.Hash
}
func New(hasBlock hashCheckFn, insertChain chainInsertFn, currentTd currentTdFn) *Downloader {
downloader := &Downloader{
queue: newqueue(),
peers: make(peers),
hasBlock: hasBlock,
insertChain: insertChain,
newPeerCh: make(chan *peer, 1),
selectPeerCh: make(chan *peer, 1),
HashCh: make(chan []common.Hash, 1),
blockCh: make(chan blockPack, 1),
quit: make(chan struct{}),
queue: newqueue(),
peers: make(peers),
hasBlock: hasBlock,
insertChain: insertChain,
currentTd: currentTd,
newPeerCh: make(chan *peer, 1),
syncCh: make(chan syncPack, 1),
HashCh: make(chan []common.Hash, 1),
blockCh: make(chan blockPack, 1),
quit: make(chan struct{}),
}
go downloader.peerHandler()
go downloader.update()
......@@ -116,89 +103,88 @@ func (d *Downloader) UnregisterPeer(id string) {
}
func (d *Downloader) peerHandler() {
// Fields defined here so we can reduce the amount of locking
// that needs to be done
var highestTd = new(big.Int)
// itimer is used to determine when to start ignoring `minDesiredPeerCount`
itimer := time.NewTicker(5 * time.Second)
out:
for {
select {
case newPeer := <-d.newPeerCh:
// Check if TD of peer is higher than our current
if newPeer.td.Cmp(highestTd) > 0 {
glog.V(logger.Detail).Infoln("New peer with highest TD =", newPeer.td)
highestTd.Set(newPeer.td)
// select the peer for downloading
d.selectPeerCh <- newPeer
case <-d.newPeerCh:
// Meet the `minDesiredPeerCount` before we select our best peer
if len(d.peers) < minDesiredPeerCount {
break
}
d.selectPeer(d.peers.bestPeer())
case <-itimer.C:
// The timer will make sure that the downloader keeps an active state
// in which it attempts to always check the network for highest td peers
d.selectPeer(d.peers.bestPeer())
case <-d.quit:
break out
}
}
}
func (d *Downloader) selectPeer(p *peer) {
// Make sure it's doing neither. Once done we can restart the
// downloading process if the TD is higher. For now just get on
// with whatever is going on. This prevents unecessary switching.
if !(d.isFetchingHashes() || d.isDownloadingBlocks() || d.isProcessing()) {
// selected peer must be better than our own
// XXX we also check the peer's recent hash to make sure we
// don't have it. Some peers report (i think) incorrect TD.
if p.td.Cmp(d.currentTd()) <= 0 || d.hasBlock(p.recentHash) {
return
}
glog.V(logger.Detail).Infoln("New peer with highest TD =", p.td)
d.syncCh <- syncPack{p, p.recentHash}
}
}
func (d *Downloader) update() {
out:
for {
select {
case selectedPeer := <-d.selectPeerCh:
// Make sure it's doing neither. Once done we can restart the
// downloading process if the TD is higher. For now just get on
// with whatever is going on. This prevents unecessary switching.
if !(d.isFetchingHashes() || d.isDownloadingBlocks()) {
glog.V(logger.Detail).Infoln("Selected new peer", selectedPeer.id)
// Start the fetcher. This will block the update entirely
// interupts need to be send to the appropriate channels
// respectively.
if err := d.startFetchingHashes(selectedPeer); err != nil {
// handle error
glog.V(logger.Debug).Infoln("Error fetching hashes:", err)
// Reset
break
}
// Start fetching blocks in paralel. The strategy is simple
// take any available peers, seserve a chunk for each peer available,
// let the peer deliver the chunkn and periodically check if a peer
// has timedout. When done downloading, process blocks.
if err := d.startFetchingBlocks(selectedPeer); err != nil {
glog.V(logger.Debug).Infoln("Error downloading blocks:", err)
// reset
break
}
case sync := <-d.syncCh:
selectedPeer := sync.peer
glog.V(logger.Detail).Infoln("Synchronising with network using:", selectedPeer.id)
// Start the fetcher. This will block the update entirely
// interupts need to be send to the appropriate channels
// respectively.
if err := d.startFetchingHashes(selectedPeer, sync.hash); err != nil {
// handle error
glog.V(logger.Debug).Infoln("Error fetching hashes:", err)
// XXX Reset
break
}
// XXX this will move when optimised
// Sort the blocks by number. This bit needs much improvement. Right now
// it assumes full honesty form peers (i.e. it's not checked when the blocks
// link). We should at least check whihc queue match. This code could move
// to a seperate goroutine where it periodically checks for linked pieces.
types.BlockBy(types.Number).Sort(d.queue.blocks)
blocks := d.queue.blocks
glog.V(logger.Debug).Infoln("Inserting chain with", len(blocks), "blocks")
// Loop untill we're out of queue
for len(blocks) != 0 {
max := int(math.Min(float64(len(blocks)), 256))
// TODO check for parent error. When there's a parent error we should stop
// processing and start requesting the `block.hash` so that it's parent and
// grandparents can be requested and queued.
d.insertChain(blocks[:max])
blocks = blocks[max:]
}
// Start fetching blocks in paralel. The strategy is simple
// take any available peers, seserve a chunk for each peer available,
// let the peer deliver the chunkn and periodically check if a peer
// has timedout. When done downloading, process blocks.
if err := d.startFetchingBlocks(selectedPeer); err != nil {
glog.V(logger.Debug).Infoln("Error downloading blocks:", err)
// XXX reset
break
}
glog.V(logger.Detail).Infoln("Sync completed")
d.process()
case <-d.quit:
break out
}
}
}
func (d *Downloader) startFetchingHashes(p *peer) error {
// XXX Make synchronous
func (d *Downloader) startFetchingHashes(p *peer, hash common.Hash) error {
glog.V(logger.Debug).Infoln("Downloading hashes")
start := time.Now()
// Get the first batch of hashes
p.getHashes(p.recentHash)
p.getHashes(hash)
atomic.StoreInt32(&d.fetchingHashes, 1)
out:
......@@ -237,10 +223,6 @@ out:
return nil
}
func (d *Downloader) DeliverBlocks(id string, block []*types.Block) {
d.blockCh <- blockPack{id, block}
}
func (d *Downloader) startFetchingBlocks(p *peer) error {
glog.V(logger.Detail).Infoln("Downloading", d.queue.hashPool.Size(), "blocks")
atomic.StoreInt32(&d.downloadingBlocks, 1)
......@@ -253,8 +235,6 @@ out:
for {
select {
case blockPack := <-d.blockCh:
//fmt.Println("get for", blockPack.peerId)
d.queue.deliver(blockPack.peerId, blockPack.blocks)
d.peers.setState(blockPack.peerId, idleState)
case <-ticker.C:
......@@ -266,21 +246,24 @@ out:
// Get a possible chunk. If nil is returned no chunk
// could be returned due to no hashes available.
chunk := d.queue.get(peer, maxBlockFetch)
if chunk != nil {
//fmt.Println("fetching for", peer.id)
// Fetch the chunk and check for error. If the peer was somehow
// already fetching a chunk due to a bug, it will be returned to
// the queue
if err := peer.fetch(chunk); err != nil {
// log for tracing
glog.V(logger.Debug).Infof("peer %s received double work (state = %v)\n", peer.id, peer.state)
d.queue.put(chunk.hashes)
}
if chunk == nil {
continue
}
//fmt.Println("fetching for", peer.id)
// XXX make fetch blocking.
// Fetch the chunk and check for error. If the peer was somehow
// already fetching a chunk due to a bug, it will be returned to
// the queue
if err := peer.fetch(chunk); err != nil {
// log for tracing
glog.V(logger.Debug).Infof("peer %s received double work (state = %v)\n", peer.id, peer.state)
d.queue.put(chunk.hashes)
}
}
atomic.StoreInt32(&d.downloadingBlocks, 1)
} else if len(d.queue.fetching) == 0 {
// Whene there are no more queue and no more `fetching`. We can
// When there are no more queue and no more `fetching`. We can
// safely assume we're done. Another part of the process will check
// for parent errors and will re-request anything that's missing
atomic.StoreInt32(&d.downloadingBlocks, 0)
......@@ -325,6 +308,88 @@ out:
return nil
}
// Add an (unrequested) block to the downloader. This is usually done through the
// NewBlockMsg by the protocol handler.
func (d *Downloader) AddBlock(id string, block *types.Block, td *big.Int) {
hash := block.Hash()
if d.hasBlock(hash) {
return
}
glog.V(logger.Detail).Infoln("Inserting new block from:", id)
d.queue.addBlock(id, block, td)
// if the peer is in our healthy list of peers; update the td
// here is a good chance to add the peer back to the list
if peer := d.peers.getPeer(id); peer != nil {
peer.mu.Lock()
peer.td = td
peer.recentHash = block.Hash()
peer.mu.Unlock()
}
// if neither go ahead to process
if !(d.isFetchingHashes() || d.isDownloadingBlocks()) {
d.process()
}
}
// Deliver a chunk to the downloader. This is usually done through the BlocksMsg by
// the protocol handler.
func (d *Downloader) DeliverChunk(id string, blocks []*types.Block) {
d.blockCh <- blockPack{id, blocks}
}
func (d *Downloader) process() error {
atomic.StoreInt32(&d.processingBlocks, 1)
defer atomic.StoreInt32(&d.processingBlocks, 0)
// XXX this will move when optimised
// Sort the blocks by number. This bit needs much improvement. Right now
// it assumes full honesty form peers (i.e. it's not checked when the blocks
// link). We should at least check whihc queue match. This code could move
// to a seperate goroutine where it periodically checks for linked pieces.
types.BlockBy(types.Number).Sort(d.queue.blocks)
blocks := d.queue.blocks
glog.V(logger.Debug).Infoln("Inserting chain with", len(blocks), "blocks")
var err error
// Loop untill we're out of blocks
for len(blocks) != 0 {
max := int(math.Min(float64(len(blocks)), 256))
// TODO check for parent error. When there's a parent error we should stop
// processing and start requesting the `block.hash` so that it's parent and
// grandparents can be requested and queued.
err = d.insertChain(blocks[:max])
if err != nil && core.IsParentErr(err) {
glog.V(logger.Debug).Infoln("Aborting process due to missing parent. Fetching hashes")
// TODO change this. This shite
for i, block := range blocks[:max] {
if !d.hasBlock(block.ParentHash()) {
d.syncCh <- syncPack{d.peers.bestPeer(), block.Hash()}
// remove processed blocks
blocks = blocks[i:]
break
}
}
break
}
blocks = blocks[max:]
}
// This will allow the GC to remove the in memory blocks
if len(blocks) == 0 {
d.queue.blocks = nil
} else {
d.queue.blocks = blocks
}
return err
}
func (d *Downloader) isFetchingHashes() bool {
return atomic.LoadInt32(&d.fetchingHashes) == 1
}
......@@ -332,3 +397,7 @@ func (d *Downloader) isFetchingHashes() bool {
func (d *Downloader) isDownloadingBlocks() bool {
return atomic.LoadInt32(&d.downloadingBlocks) == 1
}
func (d *Downloader) isProcessing() bool {
return atomic.LoadInt32(&d.processingBlocks) == 1
}
eth/downloader/downloader_test.go
浏览文件 @ a8a2b2a4
......@@ -14,7 +14,7 @@ import (
var knownHash = common.Hash{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
func createHashes(amount int) (hashes []common.Hash) {
func createHashes(start, amount int) (hashes []common.Hash) {
hashes = make([]common.Hash, amount+1)
hashes[len(hashes)-1] = knownHash
......@@ -49,7 +49,7 @@ type downloadTester struct {
func newTester(t *testing.T, hashes []common.Hash, blocks map[common.Hash]*types.Block) *downloadTester {
tester := &downloadTester{t: t, hashes: hashes, blocks: blocks, done: make(chan bool)}
downloader := New(tester.hasBlock, tester.insertChain)
downloader := New(tester.hasBlock, tester.insertChain, func() *big.Int { return new(big.Int) })
tester.downloader = downloader
return tester
......@@ -84,7 +84,7 @@ func (dl *downloadTester) getBlocks(id string) func([]common.Hash) error {
blocks[i] = dl.blocks[hash]
}
go dl.downloader.DeliverBlocks(id, blocks)
go dl.downloader.DeliverChunk(id, blocks)
return nil
}
......@@ -109,11 +109,11 @@ func TestDownload(t *testing.T) {
glog.SetV(logger.Detail)
glog.SetToStderr(true)
hashes := createHashes(1000)
hashes := createHashes(0, 1000)
blocks := createBlocksFromHashes(hashes)
tester := newTester(t, hashes, blocks)
tester.newPeer("peer1", big.NewInt(10000), hashes[len(hashes)-1])
tester.newPeer("peer1", big.NewInt(10000), hashes[0])
tester.newPeer("peer2", big.NewInt(0), common.Hash{})
tester.badBlocksPeer("peer3", big.NewInt(0), common.Hash{})
tester.badBlocksPeer("peer4", big.NewInt(0), common.Hash{})
......@@ -126,3 +126,30 @@ success:
t.Error("timout")
}
}
func TestMissing(t *testing.T) {
t.Skip()
glog.SetV(logger.Detail)
glog.SetToStderr(true)
hashes := createHashes(0, 1000)
extraHashes := createHashes(1001, 1003)
blocks := createBlocksFromHashes(append(extraHashes, hashes...))
tester := newTester(t, hashes, blocks)
tester.newPeer("peer1", big.NewInt(10000), hashes[len(hashes)-1])
hashes = append(extraHashes, hashes[:len(hashes)-1]...)
tester.newPeer("peer2", big.NewInt(0), common.Hash{})
success1:
select {
case <-tester.done:
break success1
case <-time.After(10 * time.Second): // XXX this could actually fail on a slow computer
t.Error("timout")
}
tester.downloader.AddBlock("peer2", blocks[hashes[len(hashes)-1]], big.NewInt(10001))
}
eth/downloader/peer.go
浏览文件 @ a8a2b2a4
......@@ -13,9 +13,51 @@ const (
idleState = 4
)
type hashFetcherFn func(common.Hash) error
type blockFetcherFn func([]common.Hash) error
// XXX make threadsafe!!!!
type peers map[string]*peer
func (p peers) get(state int) []*peer {
var peers []*peer
for _, peer := range p {
peer.mu.RLock()
if peer.state == state {
peers = append(peers, peer)
}
peer.mu.RUnlock()
}
return peers
}
func (p peers) setState(id string, state int) {
if peer, exist := p[id]; exist {
peer.mu.Lock()
defer peer.mu.Unlock()
peer.state = state
}
}
func (p peers) getPeer(id string) *peer {
return p[id]
}
func (p peers) bestPeer() *peer {
var peer *peer
for _, cp := range p {
if peer == nil || cp.td.Cmp(peer.td) > 0 {
peer = cp
}
}
return peer
}
// peer represents an active peer
type peer struct {
state int
state int // Peer state (working, idle)
rep int // TODO peer reputation
mu sync.RWMutex
id string
......
eth/downloader/queue.go
浏览文件 @ a8a2b2a4
......@@ -2,16 +2,20 @@ package downloader
import (
"math"
"math/big"
"sync"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"gopkg.in/fatih/set.v0"
)
// queue represents hashes that are either need fetching or are being fetched
type queue struct {
hashPool *set.Set
hashPool *set.Set
fetchPool *set.Set
blockHashes *set.Set
mu sync.Mutex
fetching map[string]*chunk
......@@ -20,8 +24,10 @@ type queue struct {
func newqueue() *queue {
return &queue{
hashPool: set.New(),
fetching: make(map[string]*chunk),
hashPool: set.New(),
fetchPool: set.New(),
blockHashes: set.New(),
fetching: make(map[string]*chunk),
}
}
......@@ -50,6 +56,8 @@ func (c *queue) get(p *peer, max int) *chunk {
})
// remove the fetchable hashes from hash pool
c.hashPool.Separate(hashes)
c.fetchPool.Merge(hashes)
// Create a new chunk for the seperated hashes. The time is being used
// to reset the chunk (timeout)
chunk := &chunk{hashes, time.Now()}
......@@ -60,6 +68,22 @@ func (c *queue) get(p *peer, max int) *chunk {
return chunk
}
func (c *queue) has(hash common.Hash) bool {
return c.hashPool.Has(hash) || c.fetchPool.Has(hash)
}
func (c *queue) addBlock(id string, block *types.Block, td *big.Int) {
c.mu.Lock()
defer c.mu.Unlock()
// when adding a block make sure it doesn't already exist
if !c.blockHashes.Has(block.Hash()) {
c.hashPool.Remove(block.Hash())
c.blocks = append(c.blocks, block)
}
}
// deliver delivers a chunk to the queue that was requested of the peer
func (c *queue) deliver(id string, blocks []*types.Block) {
c.mu.Lock()
defer c.mu.Unlock()
......@@ -70,15 +94,19 @@ func (c *queue) deliver(id string, blocks []*types.Block) {
delete(c.fetching, id)
// seperate the blocks and the hashes
chunk.seperate(blocks)
blockHashes := chunk.fetchedHashes(blocks)
// merge block hashes
c.blockHashes.Merge(blockHashes)
// Add the blocks
c.blocks = append(c.blocks, blocks...)
// Add back whatever couldn't be delivered
c.hashPool.Merge(chunk.hashes)
c.fetchPool.Separate(chunk.hashes)
}
}
// puts puts sets of hashes on to the queue for fetching
func (c *queue) put(hashes *set.Set) {
c.mu.Lock()
defer c.mu.Unlock()
......@@ -91,8 +119,12 @@ type chunk struct {
itime time.Time
}
func (ch *chunk) seperate(blocks []*types.Block) {
func (ch *chunk) fetchedHashes(blocks []*types.Block) *set.Set {
fhashes := set.New()
for _, block := range blocks {
ch.hashes.Remove(block.Hash())
fhashes.Add(block.Hash())
}
ch.hashes.Separate(fhashes)
return fhashes
}
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