eth: fetch announced hashes from origin, periodically

This commit is contained in:
Péter Szilágyi 2015-06-08 19:24:56 +03:00
parent 8c012e103f
commit fdccce781e
2 changed files with 80 additions and 32 deletions

View File

@ -21,7 +21,8 @@ import (
const (
forceSyncCycle = 10 * time.Second // Time interval to force syncs, even if few peers are available
blockProcCycle = 500 * time.Millisecond // Time interval to check for new blocks to process
blockArrivalTimeout = 500 * time.Millisecond // Time allowance before an announced block is explicitly requested
notifyCheckCycle = 100 * time.Millisecond // Time interval to allow hash notifies to fulfill before hard fetching
notifyArriveTimeout = 500 * time.Millisecond // Time allowance before an announced block is explicitly requested
minDesiredPeerCount = 5 // Amount of peers desired to start syncing
blockProcAmount = 256
)
@ -57,6 +58,7 @@ type ProtocolManager struct {
minedBlockSub event.Subscription
newPeerCh chan *peer
newHashCh chan []*blockAnnounce
quitSync chan struct{}
// wait group is used for graceful shutdowns during downloading
// and processing
@ -74,6 +76,7 @@ func NewProtocolManager(protocolVersion, networkId int, mux *event.TypeMux, txpo
downloader: downloader,
peers: newPeerSet(),
newPeerCh: make(chan *peer, 1),
newHashCh: make(chan []*blockAnnounce, 1),
quitSync: make(chan struct{}),
}
@ -121,7 +124,8 @@ func (pm *ProtocolManager) Start() {
pm.minedBlockSub = pm.eventMux.Subscribe(core.NewMinedBlockEvent{})
go pm.minedBroadcastLoop()
go pm.update()
go pm.syncer()
go pm.fetcher()
}
func (pm *ProtocolManager) Stop() {
@ -302,32 +306,24 @@ func (self *ProtocolManager) handleMsg(p *peer) error {
p.blockHashes.Add(hash)
p.recentHash = hash
}
// Wait a bit for potentially receiving the blocks, fetch if not
go func() {
time.Sleep(blockArrivalTimeout)
// Drop all the hashes that are already known
unknown := make([]common.Hash, 0, len(hashes))
for _, hash := range hashes {
if !self.chainman.HasBlock(hash) {
unknown = append(unknown, hash)
}
// Schedule all the unknown hashes for retrieval
unknown := make([]common.Hash, 0, len(hashes))
for _, hash := range hashes {
if !self.chainman.HasBlock(hash) {
unknown = append(unknown, hash)
}
if len(unknown) == 0 {
return
}
announces := make([]*blockAnnounce, len(unknown))
for i, hash := range unknown {
announces[i] = &blockAnnounce{
hash: hash,
peer: p,
time: time.Now(),
}
// Retrieve all the unknown hashes
if err := p.requestBlocks(unknown); err != nil {
glog.V(logger.Debug).Infof("%s: failed to request blocks: %v", p.id, err)
}
if glog.V(logger.Detail) {
hashes := make([]string, len(unknown))
for i, hash := range unknown {
hashes[i] = fmt.Sprintf("%x", hash[:4])
}
glog.Infof("%s: requested blocks explicitly: %v", p.id, hashes)
}
}()
}
if len(announces) > 0 {
self.newHashCh <- announces
}
case NewBlockMsg:
var request newBlockMsgData
@ -407,13 +403,13 @@ func (pm *ProtocolManager) BroadcastBlock(hash common.Hash, block *types.Block)
split := int(math.Sqrt(float64(len(peers))))
transfer := peers[:split]
nofity := peers[split:]
notify := peers[split:]
// Send out the data transfers and the notifications
for _, peer := range nofity {
for _, peer := range notify {
peer.sendNewBlockHashes([]common.Hash{hash})
}
glog.V(logger.Detail).Infoln("broadcast hash to", len(nofity), "peers.")
glog.V(logger.Detail).Infoln("broadcast hash to", len(notify), "peers.")
for _, peer := range transfer {
peer.sendNewBlock(block)

View File

@ -5,15 +5,67 @@ import (
"sync/atomic"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/eth/downloader"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
)
// update periodically tries to synchronise with the network, both downloading
// hashes and blocks as well as retrieving cached ones.
func (pm *ProtocolManager) update() {
// blockAnnounce is the hash notification of the availability of a new block in
// the network.
type blockAnnounce struct {
hash common.Hash
peer *peer
time time.Time
}
// fetcher is responsible for collecting hash notifications, and periodically
// checking all unknown ones and individually fetching them.
func (pm *ProtocolManager) fetcher() {
announces := make(map[common.Hash]*blockAnnounce)
request := make(map[*peer][]common.Hash)
cycle := time.Tick(notifyCheckCycle)
// Iterate the block fetching until a quit is requested
for {
select {
case notifications := <-pm.newHashCh:
// A batch of hashes the notified, schedule them for retrieval
glog.V(logger.Detail).Infof("Scheduling %d hash announces from %s", len(notifications), notifications[0].peer.id)
for _, announce := range notifications {
announces[announce.hash] = announce
}
case <-cycle:
// Check if any notified blocks failed to arrive
for hash, announce := range announces {
if time.Since(announce.time) > notifyArriveTimeout {
if !pm.chainman.HasBlock(hash) {
request[announce.peer] = append(request[announce.peer], hash)
}
delete(announces, hash)
}
}
if len(request) == 0 {
break
}
// Send out all block requests
for peer, hashes := range request {
glog.V(logger.Detail).Infof("Fetching specific %d blocks from %s", len(hashes), peer.id)
peer.requestBlocks(hashes)
}
request = make(map[*peer][]common.Hash)
case <-pm.quitSync:
return
}
}
}
// syncer is responsible for periodically synchronising with the network, both
// downloading hashes and blocks as well as retrieving cached ones.
func (pm *ProtocolManager) syncer() {
forceSync := time.Tick(forceSyncCycle)
blockProc := time.Tick(blockProcCycle)
blockProcPend := int32(0)