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minio/pkg/donut/donut-v1.go

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11 KiB

/*
* Minimalist Object Storage, (C) 2015 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 donut
import (
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/minio/minio/pkg/donut/disk"
"github.com/minio/minio/pkg/iodine"
)
// config files used inside Donut
const (
// donut system config
donutConfig = "donutConfig.json"
// bucket, object metadata
bucketMetadataConfig = "bucketMetadata.json"
objectMetadataConfig = "objectMetadata.json"
// versions
objectMetadataVersion = "1.0.0"
bucketMetadataVersion = "1.0.0"
)
/// v1 API functions
// makeBucket - make a new bucket
func (donut API) makeBucket(bucket string, acl BucketACL) error {
if bucket == "" || strings.TrimSpace(bucket) == "" {
return iodine.New(InvalidArgument{}, nil)
}
return donut.makeDonutBucket(bucket, acl.String())
}
// getBucketMetadata - get bucket metadata
func (donut API) getBucketMetadata(bucketName string) (BucketMetadata, error) {
if err := donut.listDonutBuckets(); err != nil {
return BucketMetadata{}, iodine.New(err, nil)
}
if _, ok := donut.buckets[bucketName]; !ok {
return BucketMetadata{}, iodine.New(BucketNotFound{Bucket: bucketName}, nil)
}
metadata, err := donut.getDonutBucketMetadata()
if err != nil {
return BucketMetadata{}, iodine.New(err, nil)
}
return metadata.Buckets[bucketName], nil
}
// setBucketMetadata - set bucket metadata
func (donut API) setBucketMetadata(bucketName string, bucketMetadata map[string]string) error {
if err := donut.listDonutBuckets(); err != nil {
return iodine.New(err, nil)
}
metadata, err := donut.getDonutBucketMetadata()
if err != nil {
return iodine.New(err, nil)
}
oldBucketMetadata := metadata.Buckets[bucketName]
acl, ok := bucketMetadata["acl"]
if !ok {
return iodine.New(InvalidArgument{}, nil)
}
oldBucketMetadata.ACL = BucketACL(acl)
metadata.Buckets[bucketName] = oldBucketMetadata
return donut.setDonutBucketMetadata(metadata)
}
// listBuckets - return list of buckets
func (donut API) listBuckets() (map[string]BucketMetadata, error) {
if err := donut.listDonutBuckets(); err != nil {
return nil, iodine.New(err, nil)
}
metadata, err := donut.getDonutBucketMetadata()
if err != nil {
// intentionally left out the error when Donut is empty
// but we need to revisit this area in future - since we need
// to figure out between acceptable and unacceptable errors
return make(map[string]BucketMetadata), nil
}
if metadata == nil {
return make(map[string]BucketMetadata), nil
}
return metadata.Buckets, nil
}
// listObjects - return list of objects
func (donut API) listObjects(bucket, prefix, marker, delimiter string, maxkeys int) (ListObjectsResults, error) {
errParams := map[string]string{
"bucket": bucket,
"prefix": prefix,
"marker": marker,
"delimiter": delimiter,
"maxkeys": strconv.Itoa(maxkeys),
}
if err := donut.listDonutBuckets(); err != nil {
return ListObjectsResults{}, iodine.New(err, errParams)
}
if _, ok := donut.buckets[bucket]; !ok {
return ListObjectsResults{}, iodine.New(BucketNotFound{Bucket: bucket}, errParams)
}
listObjects, err := donut.buckets[bucket].ListObjects(prefix, marker, delimiter, maxkeys)
if err != nil {
return ListObjectsResults{}, iodine.New(err, errParams)
}
return listObjects, nil
}
// putObject - put object
func (donut API) putObject(bucket, object, expectedMD5Sum string, reader io.Reader, metadata map[string]string, signature *Signature) (ObjectMetadata, error) {
errParams := map[string]string{
"bucket": bucket,
"object": object,
}
if bucket == "" || strings.TrimSpace(bucket) == "" {
return ObjectMetadata{}, iodine.New(InvalidArgument{}, errParams)
}
if object == "" || strings.TrimSpace(object) == "" {
return ObjectMetadata{}, iodine.New(InvalidArgument{}, errParams)
}
if err := donut.listDonutBuckets(); err != nil {
return ObjectMetadata{}, iodine.New(err, errParams)
}
if _, ok := donut.buckets[bucket]; !ok {
return ObjectMetadata{}, iodine.New(BucketNotFound{Bucket: bucket}, nil)
}
bucketMeta, err := donut.getDonutBucketMetadata()
if err != nil {
return ObjectMetadata{}, iodine.New(err, errParams)
}
if _, ok := bucketMeta.Buckets[bucket].BucketObjects[object]; ok {
return ObjectMetadata{}, iodine.New(ObjectExists{Object: object}, errParams)
}
objMetadata, err := donut.buckets[bucket].WriteObject(object, reader, expectedMD5Sum, metadata, signature)
if err != nil {
return ObjectMetadata{}, iodine.New(err, errParams)
}
bucketMeta.Buckets[bucket].BucketObjects[object] = struct{}{}
if err := donut.setDonutBucketMetadata(bucketMeta); err != nil {
return ObjectMetadata{}, iodine.New(err, errParams)
}
return objMetadata, nil
}
// getObject - get object
func (donut API) getObject(bucket, object string) (reader io.ReadCloser, size int64, err error) {
errParams := map[string]string{
"bucket": bucket,
"object": object,
}
if bucket == "" || strings.TrimSpace(bucket) == "" {
return nil, 0, iodine.New(InvalidArgument{}, errParams)
}
if object == "" || strings.TrimSpace(object) == "" {
return nil, 0, iodine.New(InvalidArgument{}, errParams)
}
if err := donut.listDonutBuckets(); err != nil {
return nil, 0, iodine.New(err, nil)
}
if _, ok := donut.buckets[bucket]; !ok {
return nil, 0, iodine.New(BucketNotFound{Bucket: bucket}, errParams)
}
return donut.buckets[bucket].ReadObject(object)
}
// getObjectMetadata - get object metadata
func (donut API) getObjectMetadata(bucket, object string) (ObjectMetadata, error) {
errParams := map[string]string{
"bucket": bucket,
"object": object,
}
if err := donut.listDonutBuckets(); err != nil {
return ObjectMetadata{}, iodine.New(err, errParams)
}
if _, ok := donut.buckets[bucket]; !ok {
return ObjectMetadata{}, iodine.New(BucketNotFound{Bucket: bucket}, errParams)
}
bucketMeta, err := donut.getDonutBucketMetadata()
if err != nil {
return ObjectMetadata{}, iodine.New(err, errParams)
}
if _, ok := bucketMeta.Buckets[bucket].BucketObjects[object]; !ok {
return ObjectMetadata{}, iodine.New(ObjectNotFound{Object: object}, errParams)
}
objectMetadata, err := donut.buckets[bucket].GetObjectMetadata(object)
if err != nil {
return ObjectMetadata{}, iodine.New(err, nil)
}
return objectMetadata, nil
}
//// internal functions
// getBucketMetadataWriters -
func (donut API) getBucketMetadataWriters() ([]io.WriteCloser, error) {
var writers []io.WriteCloser
for _, node := range donut.nodes {
disks, err := node.ListDisks()
if err != nil {
return nil, iodine.New(err, nil)
}
writers = make([]io.WriteCloser, len(disks))
for order, disk := range disks {
bucketMetaDataWriter, err := disk.CreateFile(filepath.Join(donut.config.DonutName, bucketMetadataConfig))
if err != nil {
return nil, iodine.New(err, nil)
}
writers[order] = bucketMetaDataWriter
}
}
return writers, nil
}
// getBucketMetadataReaders - readers are returned in map rather than slice
func (donut API) getBucketMetadataReaders() (map[int]io.ReadCloser, error) {
readers := make(map[int]io.ReadCloser)
disks := make(map[int]disk.Disk)
var err error
for _, node := range donut.nodes {
nDisks, err := node.ListDisks()
if err != nil {
return nil, iodine.New(err, nil)
}
for k, v := range nDisks {
disks[k] = v
}
}
var bucketMetaDataReader io.ReadCloser
for order, disk := range disks {
bucketMetaDataReader, err = disk.OpenFile(filepath.Join(donut.config.DonutName, bucketMetadataConfig))
if err != nil {
continue
}
readers[order] = bucketMetaDataReader
}
if err != nil {
return nil, iodine.New(err, nil)
}
return readers, nil
}
// setDonutBucketMetadata -
func (donut API) setDonutBucketMetadata(metadata *AllBuckets) error {
writers, err := donut.getBucketMetadataWriters()
if err != nil {
return iodine.New(err, nil)
}
for _, writer := range writers {
jenc := json.NewEncoder(writer)
if err := jenc.Encode(metadata); err != nil {
CleanupWritersOnError(writers)
return iodine.New(err, nil)
}
}
for _, writer := range writers {
writer.Close()
}
return nil
}
// getDonutBucketMetadata -
func (donut API) getDonutBucketMetadata() (*AllBuckets, error) {
metadata := &AllBuckets{}
var err error
readers, err := donut.getBucketMetadataReaders()
if err != nil {
return nil, iodine.New(err, nil)
}
for _, reader := range readers {
defer reader.Close()
}
for _, reader := range readers {
jenc := json.NewDecoder(reader)
if err = jenc.Decode(metadata); err == nil {
return metadata, nil
}
}
return nil, iodine.New(err, nil)
}
// makeDonutBucket -
func (donut API) makeDonutBucket(bucketName, acl string) error {
if err := donut.listDonutBuckets(); err != nil {
return iodine.New(err, nil)
}
if _, ok := donut.buckets[bucketName]; ok {
return iodine.New(BucketExists{Bucket: bucketName}, nil)
}
bucket, bucketMetadata, err := newBucket(bucketName, acl, donut.config.DonutName, donut.nodes)
if err != nil {
return iodine.New(err, nil)
}
nodeNumber := 0
donut.buckets[bucketName] = bucket
for _, node := range donut.nodes {
disks, err := node.ListDisks()
if err != nil {
return iodine.New(err, nil)
}
for order, disk := range disks {
bucketSlice := fmt.Sprintf("%s$%d$%d", bucketName, nodeNumber, order)
err := disk.MakeDir(filepath.Join(donut.config.DonutName, bucketSlice))
if err != nil {
return iodine.New(err, nil)
}
}
nodeNumber = nodeNumber + 1
}
metadata, err := donut.getDonutBucketMetadata()
if err != nil {
if os.IsNotExist(iodine.ToError(err)) {
metadata := new(AllBuckets)
metadata.Buckets = make(map[string]BucketMetadata)
metadata.Buckets[bucketName] = bucketMetadata
err = donut.setDonutBucketMetadata(metadata)
if err != nil {
return iodine.New(err, nil)
}
return nil
}
return iodine.New(err, nil)
}
metadata.Buckets[bucketName] = bucketMetadata
err = donut.setDonutBucketMetadata(metadata)
if err != nil {
return iodine.New(err, nil)
}
return nil
}
// listDonutBuckets -
func (donut API) listDonutBuckets() error {
var disks map[int]disk.Disk
var err error
for _, node := range donut.nodes {
disks, err = node.ListDisks()
if err != nil {
return iodine.New(err, nil)
}
}
var dirs []os.FileInfo
for _, disk := range disks {
dirs, err = disk.ListDir(donut.config.DonutName)
if err == nil {
break
}
}
// if all disks are missing then return error
if err != nil {
return iodine.New(err, nil)
}
for _, dir := range dirs {
splitDir := strings.Split(dir.Name(), "$")
if len(splitDir) < 3 {
return iodine.New(CorruptedBackend{Backend: dir.Name()}, nil)
}
bucketName := splitDir[0]
// we dont need this once we cache from makeDonutBucket()
bucket, _, err := newBucket(bucketName, "private", donut.config.DonutName, donut.nodes)
if err != nil {
return iodine.New(err, nil)
}
donut.buckets[bucketName] = bucket
}
return nil
}