99 lines
2.2 KiB
Go
99 lines
2.2 KiB
Go
package backend
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import (
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"bytes"
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"log"
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"sync"
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"github.com/boltdb/bolt"
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)
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type BatchTx interface {
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Lock()
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Unlock()
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UnsafeCreateBucket(name []byte)
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UnsafePut(bucketName []byte, key []byte, value []byte)
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UnsafeRange(bucketName []byte, key, endKey []byte, limit int64) [][]byte
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UnsafeDelete(bucketName []byte, key []byte)
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}
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type batchTx struct {
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mu sync.Mutex
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tx *bolt.Tx
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backend *backend
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pending int
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}
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func (t *batchTx) Lock() {
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t.mu.Lock()
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}
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func (t *batchTx) Unlock() {
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t.mu.Unlock()
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}
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func (t *batchTx) UnsafeCreateBucket(name []byte) {
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_, err := t.tx.CreateBucket(name)
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if err != nil && err != bolt.ErrBucketExists {
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log.Fatalf("storage: cannot create bucket %s (%v)", string(name), err)
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}
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}
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// before calling unsafePut, the caller MUST hold the lock on tnx.
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func (t *batchTx) UnsafePut(bucketName []byte, key []byte, value []byte) {
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bucket := t.tx.Bucket(bucketName)
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if bucket == nil {
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log.Fatalf("storage: bucket %s does not exist", string(bucketName))
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}
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if err := bucket.Put(key, value); err != nil {
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log.Fatalf("storage: cannot put key into bucket (%v)", err)
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}
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t.pending++
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if t.pending > t.backend.batchLimit {
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t.backend.commitAndBegin()
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t.pending = 0
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}
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}
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// before calling unsafeRange, the caller MUST hold the lock on tnx.
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func (t *batchTx) UnsafeRange(bucketName []byte, key, endKey []byte, limit int64) [][]byte {
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bucket := t.tx.Bucket(bucketName)
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if bucket == nil {
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log.Fatalf("storage: bucket %s does not exist", string(bucketName))
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}
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var vs [][]byte
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if len(endKey) == 0 {
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if v := bucket.Get(key); v == nil {
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return vs
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} else {
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return append(vs, v)
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}
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}
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c := bucket.Cursor()
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for ck, cv := c.Seek(key); ck != nil && bytes.Compare(ck, endKey) < 0; ck, cv = c.Next() {
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vs = append(vs, cv)
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}
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return vs
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}
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// before calling unsafeDelete, the caller MUST hold the lock on tnx.
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func (t *batchTx) UnsafeDelete(bucketName []byte, key []byte) {
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bucket := t.tx.Bucket(bucketName)
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if bucket == nil {
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log.Fatalf("storage: bucket %s does not exist", string(bucketName))
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}
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err := bucket.Delete(key)
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if err != nil {
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log.Fatalf("storage: cannot delete key from bucket (%v)", err)
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}
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t.pending++
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if t.pending > t.backend.batchLimit {
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t.backend.commitAndBegin()
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t.pending = 0
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}
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}
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