mirror of https://github.com/poanetwork/quorum.git
80 lines
2.4 KiB
Go
80 lines
2.4 KiB
Go
package downloader
|
|
|
|
import (
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/core/types"
|
|
"github.com/ethereum/go-ethereum/logger"
|
|
"github.com/ethereum/go-ethereum/logger/glog"
|
|
)
|
|
|
|
// THIS IS PENDING AND TO DO CHANGES FOR MAKING THE DOWNLOADER SYNCHRONOUS
|
|
|
|
// SynchroniseWithPeer will select the peer and use it for synchronising. If an empty string is given
|
|
// it will use the best peer possible and synchronise if it's TD is higher than our own. If any of the
|
|
// checks fail an error will be returned. This method is synchronous
|
|
func (d *Downloader) SynchroniseWithPeer(id string) (types.Blocks, error) {
|
|
// Check if we're busy
|
|
if d.isBusy() {
|
|
return nil, errBusy
|
|
}
|
|
|
|
// Attempt to select a peer. This can either be nothing, which returns, best peer
|
|
// or selected peer. If no peer could be found an error will be returned
|
|
var p *peer
|
|
if len(id) == 0 {
|
|
p = d.peers[id]
|
|
if p == nil {
|
|
return nil, errUnknownPeer
|
|
}
|
|
} else {
|
|
p = d.peers.bestPeer()
|
|
}
|
|
|
|
// Make sure our td is lower than the peer's td
|
|
if p.td.Cmp(d.currentTd()) <= 0 || d.hasBlock(p.recentHash) {
|
|
return nil, errLowTd
|
|
}
|
|
|
|
// Get the hash from the peer and initiate the downloading progress.
|
|
err := d.getFromPeer(p, p.recentHash, false)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return d.queue.blocks, nil
|
|
}
|
|
|
|
// Synchronise will synchronise using the best peer.
|
|
func (d *Downloader) Synchronise() (types.Blocks, error) {
|
|
return d.SynchroniseWithPeer("")
|
|
}
|
|
|
|
func (d *Downloader) getFromPeer(p *peer, hash common.Hash, ignoreInitial bool) error {
|
|
d.activePeer = p.id
|
|
|
|
glog.V(logger.Detail).Infoln("Synchronising with the network using:", p.id)
|
|
// Start the fetcher. This will block the update entirely
|
|
// interupts need to be send to the appropriate channels
|
|
// respectively.
|
|
if err := d.startFetchingHashes(p, hash, ignoreInitial); err != nil {
|
|
// handle error
|
|
glog.V(logger.Debug).Infoln("Error fetching hashes:", err)
|
|
// XXX Reset
|
|
return err
|
|
}
|
|
|
|
// 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(p); err != nil {
|
|
glog.V(logger.Debug).Infoln("Error downloading blocks:", err)
|
|
// XXX reset
|
|
return err
|
|
}
|
|
|
|
glog.V(logger.Detail).Infoln("Sync completed")
|
|
|
|
return nil
|
|
}
|