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Added memory diff to memory mutation (ledgerwatch#1068)
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,58 @@ | ||
package memdb | ||
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import "github.com/ledgerwatch/erigon-lib/kv" | ||
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type entry struct { | ||
k []byte | ||
v []byte | ||
} | ||
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type MemoryDiff struct { | ||
diff map[table][]entry // god. | ||
deletedEntries map[string][]string | ||
clearedTableNames []string | ||
} | ||
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type table struct { | ||
name string | ||
dupsort bool | ||
} | ||
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func (m *MemoryDiff) Flush(tx kv.RwTx) error { | ||
// Obliterate buckets who are to be deleted | ||
for _, bucket := range m.clearedTableNames { | ||
if err := tx.ClearBucket(bucket); err != nil { | ||
return err | ||
} | ||
} | ||
// Obliterate entries who are to be deleted | ||
for bucket, keys := range m.deletedEntries { | ||
for _, key := range keys { | ||
if err := tx.Delete(bucket, []byte(key)); err != nil { | ||
return err | ||
} | ||
} | ||
} | ||
// Iterate over each bucket and apply changes accordingly. | ||
for bucketInfo, bucketDiff := range m.diff { | ||
if bucketInfo.dupsort { | ||
dbCursor, err := tx.RwCursorDupSort(bucketInfo.name) | ||
if err != nil { | ||
return err | ||
} | ||
defer dbCursor.Close() | ||
for _, entry := range bucketDiff { | ||
if err := dbCursor.Put(entry.k, entry.v); err != nil { | ||
return err | ||
} | ||
} | ||
} else { | ||
for _, entry := range bucketDiff { | ||
if err := tx.Put(bucketInfo.name, entry.k, entry.v); err != nil { | ||
return err | ||
} | ||
} | ||
} | ||
} | ||
return nil | ||
} |