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core: fixed unwinding bad hash (#3347) 

Fixed unwinding of bad hashes when already on the canon chain
This commit is contained in:
Jeffrey Wilcke 2016-11-28 10:37:42 +01:00 committed by GitHub
parent eea8d6aa96
commit 801a13f791
1 changed files with 8 additions and 3 deletions
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5
core/blockchain.go
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@ -152,11 +152,16 @@ func NewBlockChain(chainDb ethdb.Database, config *params.ChainConfig, pow pow.P
// Check the current state of the block hashes and make sure that we do not have any of the bad blocks in our chain // Check the current state of the block hashes and make sure that we do not have any of the bad blocks in our chain
for hash, _ := range BadHashes { for hash, _ := range BadHashes {
if header := bc.GetHeaderByHash(hash); header != nil { if header := bc.GetHeaderByHash(hash); header != nil {
// get the canonical block corresponding to the offending header's number
headerByNumber := bc.GetHeaderByNumber(header.Number.Uint64())
// make sure the headerByNumber (if present) is in our current canonical chain
if headerByNumber != nil && headerByNumber.Hash() == header.Hash() {
glog.V(logger.Error).Infof("Found bad hash, rewinding chain to block #%d [%x…]", header.Number, header.ParentHash[:4]) glog.V(logger.Error).Infof("Found bad hash, rewinding chain to block #%d [%x…]", header.Number, header.ParentHash[:4])
bc.SetHead(header.Number.Uint64() - 1) bc.SetHead(header.Number.Uint64() - 1)
glog.V(logger.Error).Infoln("Chain rewind was successful, resuming normal operation") glog.V(logger.Error).Infoln("Chain rewind was successful, resuming normal operation")
} }
} }
}
// Take ownership of this particular state // Take ownership of this particular state
go bc.update() go bc.update()
return bc, nil return bc, nil