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eth: enforce chain above CHT before accepting txs into the pool

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Péter Szilágyi 2019-04-26 12:11:22 +03:00
parent 3873a7314d
commit ed47f29bc8
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GPG Key ID: E9AE538CEDF8293D
2 changed files with 33 additions and 7 deletions
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27
eth/handler.go
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@ -181,13 +181,30 @@ func NewProtocolManager(config *params.ChainConfig, mode downloader.SyncMode, ne
return blockchain.CurrentBlock().NumberU64()
}
inserter := func(blocks types.Blocks) (int, error) {
// If fast sync is running, deny importing weird blocks
if atomic.LoadUint32(&manager.fastSync) == 1 {
log.Warn("Discarded bad propagated block", "number", blocks[0].Number(), "hash", blocks[0].Hash())
// If sync hasn't reached the checkpoint yet, deny importing weird blocks.
//
// Ideally we would also compare the head block's timestamp and similarly reject
// the propagated block if the head is too old. Unfortunately there is a corner
// case when starting new networks, where the genesis might be ancient (0 unix)
// which would prevent full nodes from accepting it.
if manager.blockchain.CurrentBlock().NumberU64() < manager.checkpointNumber {
log.Warn("Unsynced yet, discarded propagated block", "number", blocks[0].Number(), "hash", blocks[0].Hash())
return 0, nil
}
atomic.StoreUint32(&manager.acceptTxs, 1) // Mark initial sync done on any fetcher import
return manager.blockchain.InsertChain(blocks)
// If fast sync is running, deny importing weird blocks. This is a problematic
// clause when starting up a new network, because fast-syncing miners might not
// accept each others' blocks until a restart. Unfortunately we haven't figured
// out a way yet where nodes can decide unilaterally whether the network is new
// or not. This should be fixed if we figure out a solution.
if atomic.LoadUint32(&manager.fastSync) == 1 {
log.Warn("Fast syncing, discarded propagated block", "number", blocks[0].Number(), "hash", blocks[0].Hash())
return 0, nil
}
n, err := manager.blockchain.InsertChain(blocks)
if err == nil {
atomic.StoreUint32(&manager.acceptTxs, 1) // Mark initial sync done on any fetcher import
}
return n, err
}
manager.fetcher = fetcher.New(blockchain.GetBlockByHash, validator, manager.BroadcastBlock, heighter, inserter, manager.removePeer)

13
eth/sync.go
View File

@ -202,8 +202,17 @@ func (pm *ProtocolManager) synchronise(peer *peer) {
log.Info("Fast sync complete, auto disabling")
atomic.StoreUint32(&pm.fastSync, 0)
}
atomic.StoreUint32(&pm.acceptTxs, 1) // Mark initial sync done
if head := pm.blockchain.CurrentBlock(); head.NumberU64() > 0 {
// If we've successfully finished a sync cycle and passed any required checkpoint,
// enable accepting transactions from the network.
head := pm.blockchain.CurrentBlock()
if head.NumberU64() >= pm.checkpointNumber {
// Checkpoint passed, sanity check the timestamp to have a fallback mechanism
// for non-checkpointed (number = 0) private networks.
if head.Time() >= uint64(time.Now().AddDate(0, -1, 0).Unix()) {
atomic.StoreUint32(&pm.acceptTxs, 1)
}
}
if head.NumberU64() > 0 {
// We've completed a sync cycle, notify all peers of new state. This path is
// essential in star-topology networks where a gateway node needs to notify
// all its out-of-date peers of the availability of a new block. This failure