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core: remove lock in BlockChain.ExportN (#25254)

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* Remove locking in (*BlockChain).ExportN

Since ExportN is read-only, it shouldn't need the lock. (?)

* Add hash check to detect reorgs during export.

* fix check order

* Update blockchain.go

* Update blockchain.go

Co-authored-by: rjl493456442 <garyrong0905@gmail.com>
This commit is contained in:
henridf 2022-07-14 14:55:54 +02:00 committed by GitHub
parent 434ca026c9
commit 4766b1107f
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 9 additions and 6 deletions
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15
core/blockchain.go
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@ -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
}