117 lines
3.5 KiB
Go
117 lines
3.5 KiB
Go
package eth
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import (
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"math"
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"sync/atomic"
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"time"
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"github.com/ethereum/go-ethereum/eth/downloader"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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)
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// update periodically tries to synchronise with the network, both downloading
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// hashes and blocks as well as retrieving cached ones.
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func (pm *ProtocolManager) update() {
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forceSync := time.Tick(forceSyncCycle)
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blockProc := time.Tick(blockProcCycle)
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blockProcPend := int32(0)
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for {
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select {
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case <-pm.newPeerCh:
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// Make sure we have peers to select from, then sync
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if pm.peers.Len() < minDesiredPeerCount {
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break
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}
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go pm.synchronise(pm.peers.BestPeer())
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case <-forceSync:
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// Force a sync even if not enough peers are present
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go pm.synchronise(pm.peers.BestPeer())
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case <-blockProc:
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// Try to pull some blocks from the downloaded
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if atomic.CompareAndSwapInt32(&blockProcPend, 0, 1) {
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go func() {
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pm.processBlocks()
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atomic.StoreInt32(&blockProcPend, 0)
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}()
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}
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case <-pm.quitSync:
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return
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}
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}
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}
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// processBlocks retrieves downloaded blocks from the download cache and tries
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// to construct the local block chain with it. Note, since the block retrieval
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// order matters, access to this function *must* be synchronized/serialized.
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func (pm *ProtocolManager) processBlocks() error {
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pm.wg.Add(1)
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defer pm.wg.Done()
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// Short circuit if no blocks are available for insertion
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blocks := pm.downloader.TakeBlocks()
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if len(blocks) == 0 {
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return nil
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}
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glog.V(logger.Debug).Infof("Inserting chain with %d blocks (#%v - #%v)\n", len(blocks), blocks[0].Number(), blocks[len(blocks)-1].Number())
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for len(blocks) != 0 && !pm.quit {
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max := int(math.Min(float64(len(blocks)), float64(blockProcAmount)))
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_, err := pm.chainman.InsertChain(blocks[:max])
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if err != nil {
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glog.V(logger.Warn).Infof("Block insertion failed: %v", err)
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pm.downloader.Cancel()
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return err
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}
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blocks = blocks[max:]
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}
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return nil
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}
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// synchronise tries to sync up our local block chain with a remote peer, both
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// adding various sanity checks as well as wrapping it with various log entries.
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func (pm *ProtocolManager) synchronise(peer *peer) {
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// Short circuit if no peers are available
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if peer == nil {
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glog.V(logger.Debug).Infoln("Synchronisation canceled: no peers available")
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return
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}
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// Make sure the peer's TD is higher than our own. If not drop.
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if peer.td.Cmp(pm.chainman.Td()) <= 0 {
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glog.V(logger.Debug).Infoln("Synchronisation canceled: peer TD too small")
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return
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}
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// FIXME if we have the hash in our chain and the TD of the peer is
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// much higher than ours, something is wrong with us or the peer.
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// Check if the hash is on our own chain
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if pm.chainman.HasBlock(peer.recentHash) {
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glog.V(logger.Debug).Infoln("Synchronisation canceled: head already known")
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return
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}
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// Get the hashes from the peer (synchronously)
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glog.V(logger.Debug).Infof("Attempting synchronisation: %v, 0x%x", peer.id, peer.recentHash)
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err := pm.downloader.Synchronise(peer.id, peer.recentHash)
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switch err {
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case nil:
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glog.V(logger.Debug).Infof("Synchronisation completed")
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case downloader.ErrBusy:
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glog.V(logger.Debug).Infof("Synchronisation already in progress")
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case downloader.ErrTimeout, downloader.ErrBadPeer, downloader.ErrInvalidChain, downloader.ErrCrossCheckFailed:
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glog.V(logger.Debug).Infof("Removing peer %v: %v", peer.id, err)
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pm.removePeer(peer)
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case downloader.ErrPendingQueue:
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glog.V(logger.Debug).Infoln("Synchronisation aborted:", err)
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default:
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glog.V(logger.Warn).Infof("Synchronisation failed: %v", err)
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}
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}
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