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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| package bbolt | ||
|
|
||
| // Compact will create a copy of the source DB and in the destination DB. This may | ||
| // reclaim space that the source database no longer has use for. txMaxSize can be | ||
| // used to limit the transactions size of this process and may trigger intermittent | ||
| // commits. A value of zero will ignore transaction sizes. | ||
| // TODO: merge with: https://github.com/etcd-io/etcd/blob/b7f0f52a16dbf83f18ca1d803f7892d750366a94/mvcc/backend/backend.go#L349 | ||
| func Compact(dst, src *DB, txMaxSize int64) error { | ||
| // commit regularly, or we'll run out of memory for large datasets if using one transaction. | ||
| var size int64 | ||
| tx, err := dst.Begin(true) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer tx.Rollback() | ||
|
|
||
| if err := walk(src, func(keys [][]byte, k, v []byte, seq uint64) error { | ||
| // On each key/value, check if we have exceeded tx size. | ||
| sz := int64(len(k) + len(v)) | ||
| if size+sz > txMaxSize && txMaxSize != 0 { | ||
| // Commit previous transaction. | ||
| if err := tx.Commit(); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // Start new transaction. | ||
| tx, err = dst.Begin(true) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| size = 0 | ||
| } | ||
| size += sz | ||
|
|
||
| // Create bucket on the root transaction if this is the first level. | ||
| nk := len(keys) | ||
| if nk == 0 { | ||
| bkt, err := tx.CreateBucket(k) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if err := bkt.SetSequence(seq); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Create buckets on subsequent levels, if necessary. | ||
| b := tx.Bucket(keys[0]) | ||
| if nk > 1 { | ||
| for _, k := range keys[1:] { | ||
| b = b.Bucket(k) | ||
| } | ||
| } | ||
|
|
||
| // Fill the entire page for best compaction. | ||
| b.FillPercent = 1.0 | ||
|
|
||
| // If there is no value then this is a bucket call. | ||
| if v == nil { | ||
| bkt, err := b.CreateBucket(k) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if err := bkt.SetSequence(seq); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Otherwise treat it as a key/value pair. | ||
| return b.Put(k, v) | ||
| }); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return tx.Commit() | ||
| } | ||
|
|
||
| // walkFunc is the type of the function called for keys (buckets and "normal" | ||
| // values) discovered by Walk. keys is the list of keys to descend to the bucket | ||
| // owning the discovered key/value pair k/v. | ||
| type walkFunc func(keys [][]byte, k, v []byte, seq uint64) error | ||
|
|
||
| // walk walks recursively the bolt database db, calling walkFn for each key it finds. | ||
| func walk(db *DB, walkFn walkFunc) error { | ||
| return db.View(func(tx *Tx) error { | ||
| return tx.ForEach(func(name []byte, b *Bucket) error { | ||
| return walkBucket(b, nil, name, nil, b.Sequence(), walkFn) | ||
| }) | ||
| }) | ||
| } | ||
|
|
||
| func walkBucket(b *Bucket, keypath [][]byte, k, v []byte, seq uint64, fn walkFunc) error { | ||
| // Execute callback. | ||
| if err := fn(keypath, k, v, seq); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // If this is not a bucket then stop. | ||
| if v != nil { | ||
| return nil | ||
| } | ||
|
|
||
| // Iterate over each child key/value. | ||
| keypath = append(keypath, k) | ||
| return b.ForEach(func(k, v []byte) error { | ||
| if v == nil { | ||
| bkt := b.Bucket(k) | ||
| return walkBucket(bkt, keypath, k, nil, bkt.Sequence(), fn) | ||
| } | ||
| return walkBucket(b, keypath, k, v, b.Sequence(), fn) | ||
| }) | ||
| } |
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