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core: don't panic on init when there are less than 2000 hashes

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If you're to sync less than 2000 headers no batched header key-value is
gonna be written into the DB and init() would panic because
bc.headerList.Len() would return 0. Use genesis block as a target in this
case.
This commit is contained in:
Roman Khimov 2019-10-21 08:37:01 +03:00
parent dafd385f57
commit b533dfceba
1 changed files with 10 additions and 1 deletions
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11
pkg/core/blockchain.go
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@ -137,7 +137,16 @@ func (bc *Blockchain) init() error {
// that with stored blocks.
if currHeaderHeight > bc.storedHeaderCount {
hash := currHeaderHash
targetHash := bc.headerList.Get(bc.headerList.Len() - 1)
var targetHash util.Uint256
if bc.headerList.Len() > 0 {
targetHash = bc.headerList.Get(bc.headerList.Len() - 1)
} else {
genesisBlock, err := createGenesisBlock(bc.config)
if err != nil {
return err
}
targetHash = genesisBlock.Hash()
}
headers := make([]*Header, 0)
for hash != targetHash {