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blob.go
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blob.go
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// 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
//
// https://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.
//
// Original source: github.com/micro/go-micro/v3/store/file/blob.go
package file
import (
"bytes"
"io"
"io/ioutil"
"os"
"path/filepath"
"time"
"github.com/micro/micro/v3/service/store"
bolt "go.etcd.io/bbolt"
)
// NewBlobStore returns a blob file store
func NewBlobStore(opts ...store.StoreOption) (store.BlobStore, error) {
// parse the options
var options store.StoreOptions
for _, o := range opts {
o(&options)
}
var dir string
if options.Context != nil {
if d, ok := options.Context.Value(dirKey{}).(string); ok {
dir = d
}
}
if len(dir) == 0 {
dir = DefaultDir
}
// ensure the parent directory exists
os.MkdirAll(dir, 0700)
return &blobStore{dir}, nil
}
type blobStore struct {
dir string
}
func (b *blobStore) db() (*bolt.DB, error) {
dbPath := filepath.Join(b.dir, "blob.db")
return bolt.Open(dbPath, 0700, &bolt.Options{Timeout: 5 * time.Second})
}
func (b *blobStore) Read(key string, opts ...store.BlobOption) (io.Reader, error) {
// validate the key
if len(key) == 0 {
return nil, store.ErrMissingKey
}
// parse the options
var options store.BlobOptions
for _, o := range opts {
o(&options)
}
if len(options.Namespace) == 0 {
options.Namespace = "micro"
}
// open a connection to the database
db, err := b.db()
if err != nil {
return nil, err
}
defer db.Close()
// execute the transaction
var value []byte
readValue := func(tx *bolt.Tx) error {
// check for the namespaces bucket
bucket := tx.Bucket([]byte(options.Namespace))
if bucket == nil {
return store.ErrNotFound
}
// look for the blob within the bucket
res := bucket.Get([]byte(key))
if res == nil {
return store.ErrNotFound
}
// the res object is only valid for the duration of the blot transaction, see:
// https://github.com/golang/go/issues/33047
value = make([]byte, len(res))
copy(value, res)
return nil
}
if err := db.View(readValue); err != nil {
return nil, err
}
// return the blob
return bytes.NewBuffer(value), nil
}
func (b *blobStore) Write(key string, blob io.Reader, opts ...store.BlobOption) error {
// validate the key
if len(key) == 0 {
return store.ErrMissingKey
}
// parse the options
var options store.BlobOptions
for _, o := range opts {
o(&options)
}
if len(options.Namespace) == 0 {
options.Namespace = "micro"
}
// open a connection to the database
db, err := b.db()
if err != nil {
return err
}
defer db.Close()
// execute the transaction
return db.Update(func(tx *bolt.Tx) error {
// create the bucket
bucket, err := tx.CreateBucketIfNotExists([]byte(options.Namespace))
if err != nil {
return err
}
// write to the bucket
value, err := ioutil.ReadAll(blob)
if err != nil {
return err
}
return bucket.Put([]byte(key), value)
})
}
func (b *blobStore) Delete(key string, opts ...store.BlobOption) error {
// validate the key
if len(key) == 0 {
return store.ErrMissingKey
}
// parse the options
var options store.BlobOptions
for _, o := range opts {
o(&options)
}
if len(options.Namespace) == 0 {
options.Namespace = "micro"
}
// open a connection to the database
db, err := b.db()
if err != nil {
return err
}
defer db.Close()
// execute the transaction
return db.Update(func(tx *bolt.Tx) error {
// check for the namespaces bucket
bucket := tx.Bucket([]byte(options.Namespace))
if bucket == nil {
return nil
}
return bucket.Delete([]byte(key))
})
}