/
client.go
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/
client.go
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// Copyright The OpenTelemetry 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 filestorage // import "github.com/open-telemetry/opentelemetry-collector-contrib/extension/storage/filestorage"
import (
"context"
"errors"
"io/ioutil"
"os"
"time"
"go.etcd.io/bbolt"
"go.opentelemetry.io/collector/extension/experimental/storage"
)
var defaultBucket = []byte(`default`)
type fileStorageClient struct {
db *bbolt.DB
}
func newClient(filePath string, timeout time.Duration) (*fileStorageClient, error) {
options := &bbolt.Options{
Timeout: timeout,
NoSync: true,
}
db, err := bbolt.Open(filePath, 0600, options)
if err != nil {
return nil, err
}
initBucket := func(tx *bbolt.Tx) error {
_, err := tx.CreateBucketIfNotExists(defaultBucket)
return err
}
if err := db.Update(initBucket); err != nil {
return nil, err
}
return &fileStorageClient{db}, nil
}
// Get will retrieve data from storage that corresponds to the specified key
func (c *fileStorageClient) Get(ctx context.Context, key string) ([]byte, error) {
op := storage.GetOperation(key)
err := c.Batch(ctx, op)
if err != nil {
return nil, err
}
return op.Value, nil
}
// Set will store data. The data can be retrieved using the same key
func (c *fileStorageClient) Set(ctx context.Context, key string, value []byte) error {
return c.Batch(ctx, storage.SetOperation(key, value))
}
// Delete will delete data associated with the specified key
func (c *fileStorageClient) Delete(ctx context.Context, key string) error {
return c.Batch(ctx, storage.DeleteOperation(key))
}
// Batch executes the specified operations in order. Get operation results are updated in place
func (c *fileStorageClient) Batch(_ context.Context, ops ...storage.Operation) error {
batch := func(tx *bbolt.Tx) error {
bucket := tx.Bucket(defaultBucket)
if bucket == nil {
return errors.New("storage not initialized")
}
var err error
for _, op := range ops {
switch op.Type {
case storage.Get:
op.Value = bucket.Get([]byte(op.Key))
case storage.Set:
err = bucket.Put([]byte(op.Key), op.Value)
case storage.Delete:
err = bucket.Delete([]byte(op.Key))
default:
return errors.New("wrong operation type")
}
if err != nil {
return err
}
}
return nil
}
return c.db.Update(batch)
}
// Close will close the database
func (c *fileStorageClient) Close(_ context.Context) error {
return c.db.Close()
}
// Compact database. Use temporary file as helper as we cannot replace database in-place
func (c *fileStorageClient) Compact(ctx context.Context, compactionDirectory string, timeout time.Duration, maxTransactionSize int64) (*fileStorageClient, error) {
// create temporary file in compactionDirectory
file, err := ioutil.TempFile(compactionDirectory, "tempdb")
if err != nil {
return nil, err
}
// use temporary file as compaction target
options := &bbolt.Options{
Timeout: timeout,
NoSync: true,
}
// cannot reuse newClient as db shouldn't contain any bucket
db, err := bbolt.Open(file.Name(), 0600, options)
if err != nil {
return nil, err
}
if err := bbolt.Compact(db, c.db, maxTransactionSize); err != nil {
return nil, err
}
dbPath := c.db.Path()
tempDBPath := db.Path()
db.Close()
c.Close(ctx)
// replace current db file with compacted db file
if err := os.Remove(dbPath); err != nil {
return nil, err
}
if err := os.Rename(tempDBPath, dbPath); err != nil {
return nil, err
}
return newClient(dbPath, timeout)
}