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cmd/geth: add code exporter for db export

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Adds a 'code' exporter to 'geth db export' that iterates over all
contract bytecode entries (CodePrefix + code_hash -> bytecode).

Usage: geth --datadir <dir> db export code code.rlp

This enables exporting contract bytecode for use by alternative
clients that need to build state trees with different key schemes.
This commit is contained in:
Edgar Luque 2026-04-10 14:10:10 +02:00
parent be4dc0c4be
commit b706162776
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GPG key ID: 70ADAE8F35904387
1 changed files with 22 additions and 0 deletions
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22
cmd/geth/dbcmd.go
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@ -806,6 +806,24 @@ func (iter *snapshotIterator) Release() {
iter.storage.Release() iter.storage.Release()
} }
type codeIterator struct {
iter ethdb.Iterator
}
func (iter *codeIterator) Next() (byte, []byte, []byte, bool) {
for iter.iter.Next() {
key := iter.iter.Key()
if bytes.HasPrefix(key, rawdb.CodePrefix) && len(key) == (len(rawdb.CodePrefix)+common.HashLength) {
return utils.OpBatchAdd, key, iter.iter.Value(), true
}
}
return 0, nil, nil, false
}
func (iter *codeIterator) Release() {
iter.iter.Release()
}
// chainExporters defines the export scheme for all exportable chain data. // chainExporters defines the export scheme for all exportable chain data.
var chainExporters = map[string]func(db ethdb.Database) utils.ChainDataIterator{ var chainExporters = map[string]func(db ethdb.Database) utils.ChainDataIterator{
"preimage": func(db ethdb.Database) utils.ChainDataIterator { "preimage": func(db ethdb.Database) utils.ChainDataIterator {
@ -817,6 +835,10 @@ var chainExporters = map[string]func(db ethdb.Database) utils.ChainDataIterator{
storage := db.NewIterator(rawdb.SnapshotStoragePrefix, nil) storage := db.NewIterator(rawdb.SnapshotStoragePrefix, nil)
return &snapshotIterator{account: account, storage: storage} return &snapshotIterator{account: account, storage: storage}
}, },
"code": func(db ethdb.Database) utils.ChainDataIterator {
iter := db.NewIterator(rawdb.CodePrefix, nil)
return &codeIterator{iter: iter}
},
} }
func exportChaindata(ctx *cli.Context) error { func exportChaindata(ctx *cli.Context) error {