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Remove locking in (*BlockChain).ExportN #25254

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merged 5 commits into from
Jul 14, 2022
Merged

Remove locking in (*BlockChain).ExportN #25254

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8b32520
Remove locking in (*BlockChain).ExportN
henridf Jul 6, 2022
8fc7da9
Add hash check to detect reorgs during export.
henridf Jul 14, 2022
46e131e
fix check order
henridf Jul 14, 2022
77522a0
Update blockchain.go
rjl493456442 Jul 14, 2022
3eb5c42
Update blockchain.go
rjl493456442 Jul 14, 2022
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15 changes: 9 additions & 6 deletions core/blockchain.go
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Original file line number Diff line number Diff line change
Expand Up @@ -739,22 +739,25 @@ func (bc *BlockChain) Export(w io.Writer) error {

// ExportN writes a subset of the active chain to the given writer.
func (bc *BlockChain) ExportN(w io.Writer, first uint64, last uint64) error {
if !bc.chainmu.TryLock() {
return errChainStopped
}
defer bc.chainmu.Unlock()

if first > last {
return fmt.Errorf("export failed: first (%d) is greater than last (%d)", first, last)
}
log.Info("Exporting batch of blocks", "count", last-first+1)

start, reported := time.Now(), time.Now()
var (
parentHash common.Hash
start = time.Now()
reported = time.Now()
)
for nr := first; nr <= last; nr++ {
block := bc.GetBlockByNumber(nr)
if block == nil {
return fmt.Errorf("export failed on #%d: not found", nr)
}
if nr > first && block.ParentHash() != parentHash {
return fmt.Errorf("export failed: chain reorg during export")
}
parentHash = block.Hash()
if err := block.EncodeRLP(w); err != nil {
return err
}
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