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cmd, eth: added light client and light server modes

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This commit is contained in:
zsfelfoldi
2016-01-13 19:35:48 +01:00
committed by Felix Lange
parent 9f8d192991
commit 7db7109a5b
17 changed files with 298 additions and 94 deletions
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27
eth/downloader/downloader.go
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@ -164,13 +164,13 @@ type Downloader struct {
}
// New creates a new downloader to fetch hashes and blocks from remote peers.
func New(stateDb ethdb.Database, mux *event.TypeMux, hasHeader headerCheckFn, hasBlockAndState blockAndStateCheckFn,
func New(mode SyncMode, stateDb ethdb.Database, mux *event.TypeMux, hasHeader headerCheckFn, hasBlockAndState blockAndStateCheckFn,
getHeader headerRetrievalFn, getBlock blockRetrievalFn, headHeader headHeaderRetrievalFn, headBlock headBlockRetrievalFn,
headFastBlock headFastBlockRetrievalFn, commitHeadBlock headBlockCommitterFn, getTd tdRetrievalFn, insertHeaders headerChainInsertFn,
insertBlocks blockChainInsertFn, insertReceipts receiptChainInsertFn, rollback chainRollbackFn, dropPeer peerDropFn) *Downloader {
dl := &Downloader{
mode: FullSync,
mode: mode,
mux: mux,
queue: newQueue(stateDb),
peers: newPeerSet(),
@ -1179,10 +1179,23 @@ func (d *Downloader) processHeaders(origin uint64, td *big.Int) error {
for i, header := range rollback {
hashes[i] = header.Hash()
}
lastHeader, lastFastBlock, lastBlock := d.headHeader().Number, d.headFastBlock().Number(), d.headBlock().Number()
lastHeader, lastFastBlock, lastBlock := d.headHeader().Number, common.Big0, common.Big0
if d.headFastBlock != nil {
lastFastBlock = d.headFastBlock().Number()
}
if d.headBlock != nil {
lastBlock = d.headBlock().Number()
}
d.rollback(hashes)
curFastBlock, curBlock := common.Big0, common.Big0
if d.headFastBlock != nil {
curFastBlock = d.headFastBlock().Number()
}
if d.headBlock != nil {
curBlock = d.headBlock().Number()
}
glog.V(logger.Warn).Infof("Rolled back %d headers (LH: %d->%d, FB: %d->%d, LB: %d->%d)",
len(hashes), lastHeader, d.headHeader().Number, lastFastBlock, d.headFastBlock().Number(), lastBlock, d.headBlock().Number())
len(hashes), lastHeader, d.headHeader().Number, lastFastBlock, curFastBlock, lastBlock, curBlock)
// If we're already past the pivot point, this could be an attack, thread carefully
if rollback[len(rollback)-1].Number.Uint64() > pivot {
@ -1229,8 +1242,10 @@ func (d *Downloader) processHeaders(origin uint64, td *big.Int) error {
// 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.getTd(d.headBlock().Hash())) > 0 {
return errStallingPeer
if d.mode != LightSync {
if !gotHeaders && td.Cmp(d.getTd(d.headBlock().Hash())) > 0 {
return errStallingPeer
}
}
// If fast or light syncing, ensure promised headers are indeed delivered. This is
// needed to detect scenarios where an attacker feeds a bad pivot and then bails out