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core: better document reason for dropping error on return (#30811)

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Add a comment for error return of nil

Signed-off-by: wangjingcun <wangjingcun@aliyun.com>
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wangjingcun 2024-11-27 14:17:03 +08:00 committed by GitHub
parent 915248cd6b
commit e0deac7f6f
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7
core/blockchain_reader.go
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@ -277,6 +277,13 @@ func (bc *BlockChain) GetTransactionLookup(hash common.Hash) (*rawdb.LegacyTxLoo
if tx == nil { if tx == nil {
progress, err := bc.TxIndexProgress() progress, err := bc.TxIndexProgress()
if err != nil { if err != nil {
// No error is returned if the transaction indexing progress is unreachable
// due to unexpected internal errors. In such cases, it is impossible to
// determine whether the transaction does not exist or has simply not been
// indexed yet without a progress marker.
//
// In such scenarios, the transaction is treated as unreachable, though
// this is clearly an unintended and unexpected situation.
return nil, nil, nil return nil, nil, nil
} }
// The transaction indexing is not finished yet, returning an // The transaction indexing is not finished yet, returning an