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backend.go
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backend.go
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// Copyright 2016 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"fmt"
"path/filepath"
"github.com/boltdb/bolt"
"github.com/coreos/etcd/mvcc"
"github.com/coreos/etcd/mvcc/backend"
)
func snapDir(dataDir string) string {
return filepath.Join(dataDir, "member", "snap")
}
func getBuckets(dbPath string) (buckets []string, err error) {
db, derr := bolt.Open(dbPath, 0600, &bolt.Options{})
if derr != nil {
return nil, derr
}
defer db.Close()
err = db.View(func(tx *bolt.Tx) error {
return tx.ForEach(func(b []byte, _ *bolt.Bucket) error {
buckets = append(buckets, string(b))
return nil
})
})
return
}
func iterateBucket(dbPath, bucket string, limit uint64) (err error) {
db, derr := bolt.Open(dbPath, 0600, &bolt.Options{})
if derr != nil {
return derr
}
defer db.Close()
err = db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(bucket))
if b == nil {
return fmt.Errorf("got nil bucket for %s", bucket)
}
c := b.Cursor()
// iterate in reverse order (use First() and Next() for ascending order)
for k, v := c.Last(); k != nil; k, v = c.Prev() {
fmt.Printf("key=%q, value=%q\n", k, v)
limit--
if limit == 0 {
break
}
}
return nil
})
return
}
func getHash(dbPath string) (hash uint32, err error) {
b := backend.NewDefaultBackend(dbPath)
return b.Hash(mvcc.DefaultIgnores)
}
// TODO: revert by revision and find specified hash value
// currently, it's hard because lease is in separate bucket
// and does not modify revision