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384 lines
11 KiB
384 lines
11 KiB
/*
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* Minimalist Object Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package donut
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import (
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"encoding/json"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"github.com/minio/minio/pkg/donut/disk"
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"github.com/minio/minio/pkg/iodine"
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)
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// config files used inside Donut
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const (
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// donut system config
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donutConfig = "donutConfig.json"
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// bucket, object metadata
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bucketMetadataConfig = "bucketMetadata.json"
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objectMetadataConfig = "objectMetadata.json"
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// versions
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objectMetadataVersion = "1.0.0"
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bucketMetadataVersion = "1.0.0"
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)
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/// v1 API functions
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// makeBucket - make a new bucket
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func (donut API) makeBucket(bucket string, acl BucketACL) error {
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if bucket == "" || strings.TrimSpace(bucket) == "" {
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return iodine.New(InvalidArgument{}, nil)
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}
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return donut.makeDonutBucket(bucket, acl.String())
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}
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// getBucketMetadata - get bucket metadata
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func (donut API) getBucketMetadata(bucketName string) (BucketMetadata, error) {
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if err := donut.listDonutBuckets(); err != nil {
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return BucketMetadata{}, iodine.New(err, nil)
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}
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if _, ok := donut.buckets[bucketName]; !ok {
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return BucketMetadata{}, iodine.New(BucketNotFound{Bucket: bucketName}, nil)
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}
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metadata, err := donut.getDonutBucketMetadata()
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if err != nil {
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return BucketMetadata{}, iodine.New(err, nil)
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}
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return metadata.Buckets[bucketName], nil
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}
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// setBucketMetadata - set bucket metadata
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func (donut API) setBucketMetadata(bucketName string, bucketMetadata map[string]string) error {
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if err := donut.listDonutBuckets(); err != nil {
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return iodine.New(err, nil)
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}
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metadata, err := donut.getDonutBucketMetadata()
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if err != nil {
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return iodine.New(err, nil)
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}
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oldBucketMetadata := metadata.Buckets[bucketName]
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acl, ok := bucketMetadata["acl"]
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if !ok {
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return iodine.New(InvalidArgument{}, nil)
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}
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oldBucketMetadata.ACL = BucketACL(acl)
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metadata.Buckets[bucketName] = oldBucketMetadata
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return donut.setDonutBucketMetadata(metadata)
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}
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// listBuckets - return list of buckets
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func (donut API) listBuckets() (map[string]BucketMetadata, error) {
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if err := donut.listDonutBuckets(); err != nil {
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return nil, iodine.New(err, nil)
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}
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metadata, err := donut.getDonutBucketMetadata()
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if err != nil {
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// intentionally left out the error when Donut is empty
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// but we need to revisit this area in future - since we need
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// to figure out between acceptable and unacceptable errors
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return make(map[string]BucketMetadata), nil
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}
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if metadata == nil {
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return make(map[string]BucketMetadata), nil
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}
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return metadata.Buckets, nil
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}
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// listObjects - return list of objects
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func (donut API) listObjects(bucket, prefix, marker, delimiter string, maxkeys int) (ListObjectsResults, error) {
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errParams := map[string]string{
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"bucket": bucket,
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"prefix": prefix,
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"marker": marker,
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"delimiter": delimiter,
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"maxkeys": strconv.Itoa(maxkeys),
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}
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if err := donut.listDonutBuckets(); err != nil {
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return ListObjectsResults{}, iodine.New(err, errParams)
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}
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if _, ok := donut.buckets[bucket]; !ok {
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return ListObjectsResults{}, iodine.New(BucketNotFound{Bucket: bucket}, errParams)
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}
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listObjects, err := donut.buckets[bucket].ListObjects(prefix, marker, delimiter, maxkeys)
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if err != nil {
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return ListObjectsResults{}, iodine.New(err, errParams)
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}
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return listObjects, nil
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}
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// putObject - put object
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func (donut API) putObject(bucket, object, expectedMD5Sum string, reader io.Reader, metadata map[string]string, signature *Signature) (ObjectMetadata, error) {
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errParams := map[string]string{
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"bucket": bucket,
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"object": object,
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}
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if bucket == "" || strings.TrimSpace(bucket) == "" {
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return ObjectMetadata{}, iodine.New(InvalidArgument{}, errParams)
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}
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if object == "" || strings.TrimSpace(object) == "" {
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return ObjectMetadata{}, iodine.New(InvalidArgument{}, errParams)
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}
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if err := donut.listDonutBuckets(); err != nil {
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return ObjectMetadata{}, iodine.New(err, errParams)
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}
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if _, ok := donut.buckets[bucket]; !ok {
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return ObjectMetadata{}, iodine.New(BucketNotFound{Bucket: bucket}, nil)
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}
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bucketMeta, err := donut.getDonutBucketMetadata()
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if err != nil {
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return ObjectMetadata{}, iodine.New(err, errParams)
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}
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if _, ok := bucketMeta.Buckets[bucket].BucketObjects[object]; ok {
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return ObjectMetadata{}, iodine.New(ObjectExists{Object: object}, errParams)
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}
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objMetadata, err := donut.buckets[bucket].WriteObject(object, reader, expectedMD5Sum, metadata, signature)
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if err != nil {
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return ObjectMetadata{}, iodine.New(err, errParams)
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}
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bucketMeta.Buckets[bucket].BucketObjects[object] = struct{}{}
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if err := donut.setDonutBucketMetadata(bucketMeta); err != nil {
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return ObjectMetadata{}, iodine.New(err, errParams)
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}
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return objMetadata, nil
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}
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// getObject - get object
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func (donut API) getObject(bucket, object string) (reader io.ReadCloser, size int64, err error) {
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errParams := map[string]string{
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"bucket": bucket,
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"object": object,
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}
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if bucket == "" || strings.TrimSpace(bucket) == "" {
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return nil, 0, iodine.New(InvalidArgument{}, errParams)
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}
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if object == "" || strings.TrimSpace(object) == "" {
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return nil, 0, iodine.New(InvalidArgument{}, errParams)
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}
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if err := donut.listDonutBuckets(); err != nil {
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return nil, 0, iodine.New(err, nil)
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}
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if _, ok := donut.buckets[bucket]; !ok {
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return nil, 0, iodine.New(BucketNotFound{Bucket: bucket}, errParams)
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}
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return donut.buckets[bucket].ReadObject(object)
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}
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// getObjectMetadata - get object metadata
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func (donut API) getObjectMetadata(bucket, object string) (ObjectMetadata, error) {
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errParams := map[string]string{
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"bucket": bucket,
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"object": object,
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}
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if err := donut.listDonutBuckets(); err != nil {
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return ObjectMetadata{}, iodine.New(err, errParams)
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}
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if _, ok := donut.buckets[bucket]; !ok {
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return ObjectMetadata{}, iodine.New(BucketNotFound{Bucket: bucket}, errParams)
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}
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bucketMeta, err := donut.getDonutBucketMetadata()
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if err != nil {
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return ObjectMetadata{}, iodine.New(err, errParams)
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}
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if _, ok := bucketMeta.Buckets[bucket].BucketObjects[object]; !ok {
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return ObjectMetadata{}, iodine.New(ObjectNotFound{Object: object}, errParams)
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}
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objectMetadata, err := donut.buckets[bucket].GetObjectMetadata(object)
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if err != nil {
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return ObjectMetadata{}, iodine.New(err, nil)
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}
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return objectMetadata, nil
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}
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//// internal functions
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// getBucketMetadataWriters -
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func (donut API) getBucketMetadataWriters() ([]io.WriteCloser, error) {
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var writers []io.WriteCloser
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for _, node := range donut.nodes {
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disks, err := node.ListDisks()
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if err != nil {
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return nil, iodine.New(err, nil)
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}
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writers = make([]io.WriteCloser, len(disks))
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for order, dd := range disks {
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bucketMetaDataWriter, err := dd.CreateFile(filepath.Join(donut.config.DonutName, bucketMetadataConfig))
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if err != nil {
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return nil, iodine.New(err, nil)
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}
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writers[order] = bucketMetaDataWriter
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}
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}
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return writers, nil
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}
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// getBucketMetadataReaders - readers are returned in map rather than slice
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func (donut API) getBucketMetadataReaders() (map[int]io.ReadCloser, error) {
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readers := make(map[int]io.ReadCloser)
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var disks map[int]disk.Disk
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var err error
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for _, node := range donut.nodes {
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disks, err = node.ListDisks()
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if err != nil {
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return nil, iodine.New(err, nil)
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}
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}
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var bucketMetaDataReader io.ReadCloser
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for order, dsk := range disks {
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bucketMetaDataReader, err = dsk.OpenFile(filepath.Join(donut.config.DonutName, bucketMetadataConfig))
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if err != nil {
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continue
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}
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readers[order] = bucketMetaDataReader
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}
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if err != nil {
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return nil, iodine.New(err, nil)
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}
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return readers, nil
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}
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// setDonutBucketMetadata -
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func (donut API) setDonutBucketMetadata(metadata *AllBuckets) error {
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writers, err := donut.getBucketMetadataWriters()
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if err != nil {
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return iodine.New(err, nil)
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}
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for _, writer := range writers {
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jenc := json.NewEncoder(writer)
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if err := jenc.Encode(metadata); err != nil {
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CleanupWritersOnError(writers)
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return iodine.New(err, nil)
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}
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}
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for _, writer := range writers {
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writer.Close()
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}
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return nil
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}
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// getDonutBucketMetadata -
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func (donut API) getDonutBucketMetadata() (*AllBuckets, error) {
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metadata := &AllBuckets{}
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var err error
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readers, err := donut.getBucketMetadataReaders()
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if err != nil {
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return nil, iodine.New(err, nil)
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}
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for _, reader := range readers {
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defer reader.Close()
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}
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for _, reader := range readers {
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jenc := json.NewDecoder(reader)
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if err = jenc.Decode(metadata); err == nil {
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return metadata, nil
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}
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}
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return nil, iodine.New(err, nil)
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}
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// makeDonutBucket -
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func (donut API) makeDonutBucket(bucketName, acl string) error {
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if err := donut.listDonutBuckets(); err != nil {
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return iodine.New(err, nil)
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}
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if _, ok := donut.buckets[bucketName]; ok {
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return iodine.New(BucketExists{Bucket: bucketName}, nil)
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}
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bucket, bucketMetadata, err := newBucket(bucketName, acl, donut.config.DonutName, donut.nodes)
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if err != nil {
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return iodine.New(err, nil)
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}
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nodeNumber := 0
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donut.buckets[bucketName] = bucket
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for _, node := range donut.nodes {
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disks, err := node.ListDisks()
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if err != nil {
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return iodine.New(err, nil)
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}
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for order, disk := range disks {
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bucketSlice := fmt.Sprintf("%s$%d$%d", bucketName, nodeNumber, order)
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err := disk.MakeDir(filepath.Join(donut.config.DonutName, bucketSlice))
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if err != nil {
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return iodine.New(err, nil)
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}
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}
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nodeNumber = nodeNumber + 1
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}
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metadata, err := donut.getDonutBucketMetadata()
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if err != nil {
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if os.IsNotExist(iodine.ToError(err)) {
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metadata := new(AllBuckets)
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metadata.Buckets = make(map[string]BucketMetadata)
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metadata.Buckets[bucketName] = bucketMetadata
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err = donut.setDonutBucketMetadata(metadata)
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if err != nil {
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return iodine.New(err, nil)
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}
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return nil
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}
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return iodine.New(err, nil)
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}
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metadata.Buckets[bucketName] = bucketMetadata
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err = donut.setDonutBucketMetadata(metadata)
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if err != nil {
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return iodine.New(err, nil)
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}
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return nil
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}
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// listDonutBuckets -
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func (donut API) listDonutBuckets() error {
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var disks map[int]disk.Disk
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var err error
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for _, node := range donut.nodes {
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disks, err = node.ListDisks()
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if err != nil {
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return iodine.New(err, nil)
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}
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}
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var dirs []os.FileInfo
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for _, disk := range disks {
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dirs, err = disk.ListDir(donut.config.DonutName)
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if err == nil {
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break
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}
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}
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// if all disks are missing then return error
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if err != nil {
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return iodine.New(err, nil)
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}
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for _, dir := range dirs {
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splitDir := strings.Split(dir.Name(), "$")
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if len(splitDir) < 3 {
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return iodine.New(CorruptedBackend{Backend: dir.Name()}, nil)
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}
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bucketName := splitDir[0]
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// we dont need this once we cache from makeDonutBucket()
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bucket, _, err := newBucket(bucketName, "private", donut.config.DonutName, donut.nodes)
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if err != nil {
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return iodine.New(err, nil)
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}
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donut.buckets[bucketName] = bucket
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}
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return nil
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}
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