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minio/fs-objects.go

225 lines
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/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* 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 (
"crypto/md5"
"encoding/hex"
"io"
"path/filepath"
"strings"
"sync"
"github.com/minio/minio/pkg/mimedb"
)
// fsObjects - Implements fs object layer.
type fsObjects struct {
storage StorageAPI
listObjectMap map[listParams][]*treeWalker
listObjectMapMutex *sync.Mutex
}
// newFSObjects - initialize new fs object layer.
func newFSObjects(exportPath string) (ObjectLayer, error) {
var storage StorageAPI
var err error
if !strings.ContainsRune(exportPath, ':') || filepath.VolumeName(exportPath) != "" {
// Initialize filesystem storage API.
storage, err = newPosix(exportPath)
if err != nil {
return nil, err
}
} else {
// Initialize rpc client storage API.
storage, err = newRPCClient(exportPath)
if err != nil {
return nil, err
}
}
// Initialize object layer - like creating minioMetaBucket,
// cleaning up tmp files etc.
initObjectLayer(storage)
// Return successfully initialized object layer.
return fsObjects{
storage: storage,
listObjectMap: make(map[listParams][]*treeWalker),
listObjectMapMutex: &sync.Mutex{},
}, nil
}
/// Bucket operations
// MakeBucket - make a bucket.
func (fs fsObjects) MakeBucket(bucket string) error {
return makeBucket(fs.storage, bucket)
}
// GetBucketInfo - get bucket info.
func (fs fsObjects) GetBucketInfo(bucket string) (BucketInfo, error) {
return getBucketInfo(fs.storage, bucket)
}
// ListBuckets - list buckets.
func (fs fsObjects) ListBuckets() ([]BucketInfo, error) {
return listBuckets(fs.storage)
}
// DeleteBucket - delete a bucket.
func (fs fsObjects) DeleteBucket(bucket string) error {
return deleteBucket(fs.storage, bucket)
}
/// Object Operations
// GetObject - get an object.
func (fs fsObjects) GetObject(bucket, object string, startOffset int64) (io.ReadCloser, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return nil, BucketNameInvalid{Bucket: bucket}
}
// Verify if object is valid.
if !IsValidObjectName(object) {
return nil, ObjectNameInvalid{Bucket: bucket, Object: object}
}
fileReader, err := fs.storage.ReadFile(bucket, object, startOffset)
if err != nil {
return nil, toObjectErr(err, bucket, object)
}
return fileReader, nil
}
// GetObjectInfo - get object info.
func (fs fsObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return ObjectInfo{}, (BucketNameInvalid{Bucket: bucket})
}
// Verify if object is valid.
if !IsValidObjectName(object) {
return ObjectInfo{}, (ObjectNameInvalid{Bucket: bucket, Object: object})
}
fi, err := fs.storage.StatFile(bucket, object)
if err != nil {
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
contentType := "application/octet-stream"
if objectExt := filepath.Ext(object); objectExt != "" {
content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]
if ok {
contentType = content.ContentType
}
}
return ObjectInfo{
Bucket: bucket,
Name: object,
ModTime: fi.ModTime,
Size: fi.Size,
IsDir: fi.Mode.IsDir(),
ContentType: contentType,
MD5Sum: "", // Read from metadata.
}, nil
}
// PutObject - create an object.
func (fs fsObjects) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string) (string, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return "", BucketNameInvalid{Bucket: bucket}
}
if !IsValidObjectName(object) {
return "", ObjectNameInvalid{
Bucket: bucket,
Object: object,
}
}
fileWriter, err := fs.storage.CreateFile(bucket, object)
if err != nil {
return "", toObjectErr(err, bucket, object)
}
// Initialize md5 writer.
md5Writer := md5.New()
// Instantiate a new multi writer.
multiWriter := io.MultiWriter(md5Writer, fileWriter)
// Instantiate checksum hashers and create a multiwriter.
if size > 0 {
if _, err = io.CopyN(multiWriter, data, size); err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", clErr
}
return "", toObjectErr(err, bucket, object)
}
} else {
if _, err = io.Copy(multiWriter, data); err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", clErr
}
return "", toObjectErr(err, bucket, object)
}
}
newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
// md5Hex representation.
var md5Hex string
if len(metadata) != 0 {
md5Hex = metadata["md5Sum"]
}
if md5Hex != "" {
if newMD5Hex != md5Hex {
if err = safeCloseAndRemove(fileWriter); err != nil {
return "", err
}
return "", BadDigest{md5Hex, newMD5Hex}
}
}
err = fileWriter.Close()
if err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", clErr
}
return "", err
}
// Return md5sum, successfully wrote object.
return newMD5Hex, nil
}
func (fs fsObjects) DeleteObject(bucket, object string) error {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return BucketNameInvalid{Bucket: bucket}
}
if !IsValidObjectName(object) {
return ObjectNameInvalid{Bucket: bucket, Object: object}
}
if err := fs.storage.DeleteFile(bucket, object); err != nil {
return toObjectErr(err, bucket, object)
}
return nil
}
// ListObjects - list all objects.
func (fs fsObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
return listObjectsCommon(fs, bucket, prefix, marker, delimiter, maxKeys)
}