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core/state: enable partial-functional reader (snapshot integration pt 3) #30650

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Dec 10, 2024
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core/state: enable partial-functional reader (snapshot integration pt 3) #30650

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9 changes: 9 additions & 0 deletions core/state/database.go
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Original file line number Diff line number Diff line change
Expand Up @@ -179,10 +179,19 @@ func (db *CachingDB) Reader(stateRoot common.Hash) (Reader, error) {
// is optional and may be partially useful if it's not fully
// generated.
if db.snap != nil {
// If standalone state snapshot is available (hash scheme),
// then construct the legacy snap reader.
snap := db.snap.Snapshot(stateRoot)
if snap != nil {
readers = append(readers, newFlatReader(snap))
}
} else {
// If standalone state snapshot is not available, try to construct
// the state reader with database.
reader, err := db.triedb.StateReader(stateRoot)
if err == nil {
readers = append(readers, newFlatReader(reader)) // state reader is optional
}
}
// Set up the trie reader, which is expected to always be available
// as the gatekeeper unless the state is corrupted.
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