mirror of https://github.com/perkeep/perkeep.git
66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
/*
|
|
Copyright 2013 The Perkeep 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 kvutil contains helpers related to
|
|
// github.com/cznic/kv.
|
|
package kvutil // import "perkeep.org/pkg/kvutil"
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"strconv"
|
|
|
|
"github.com/cznic/kv"
|
|
|
|
"go4.org/lock"
|
|
)
|
|
|
|
// Open opens the named kv DB file for reading/writing. It
|
|
// creates the file if it does not exist yet.
|
|
func Open(dbFile string, opts *kv.Options) (*kv.DB, error) {
|
|
createOpen := kv.Open
|
|
verb := "opening"
|
|
if _, err := os.Stat(dbFile); os.IsNotExist(err) {
|
|
createOpen = kv.Create
|
|
verb = "creating"
|
|
}
|
|
if opts == nil {
|
|
opts = &kv.Options{}
|
|
}
|
|
if opts.Locker == nil {
|
|
opts.Locker = func(dbFile string) (io.Closer, error) {
|
|
lkfile := dbFile + ".lock"
|
|
cl, err := lock.Lock(lkfile)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to acquire lock on %s: %v", lkfile, err)
|
|
}
|
|
return cl, nil
|
|
}
|
|
}
|
|
if v, _ := strconv.ParseBool(os.Getenv("CAMLI_KV_VERIFY")); v {
|
|
opts.VerifyDbBeforeOpen = true
|
|
opts.VerifyDbAfterOpen = true
|
|
opts.VerifyDbBeforeClose = true
|
|
opts.VerifyDbAfterClose = true
|
|
}
|
|
db, err := createOpen(dbFile, opts)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error %s %s: %v", verb, dbFile, err)
|
|
}
|
|
return db, nil
|
|
}
|