Harshavardhana
9 years ago
parent
a2c205ff2e
commit
57a2b53178
@ -1,223 +0,0 @@ |
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/* |
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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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|
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package donut |
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import ( |
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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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"time" |
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"crypto/md5" |
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"encoding/hex" |
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"github.com/minio/minio/pkg/iodine" |
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) |
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// internal struct carrying bucket specific information
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type bucket struct { |
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name string |
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acl string |
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time time.Time |
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donutName string |
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nodes map[string]Node |
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objects map[string]object |
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} |
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// NewBucket - instantiate a new bucket
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func NewBucket(bucketName, aclType, donutName string, nodes map[string]Node) (bucket, map[string]string, error) { |
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errParams := map[string]string{ |
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"bucketName": bucketName, |
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"donutName": donutName, |
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"aclType": aclType, |
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} |
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if strings.TrimSpace(bucketName) == "" || strings.TrimSpace(donutName) == "" { |
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return bucket{}, nil, iodine.New(InvalidArgument{}, errParams) |
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} |
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bucketMetadata := make(map[string]string) |
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bucketMetadata["acl"] = aclType |
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t := time.Now().UTC() |
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bucketMetadata["created"] = t.Format(time.RFC3339Nano) |
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b := bucket{} |
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b.name = bucketName |
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b.acl = aclType |
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b.time = t |
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b.donutName = donutName |
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b.objects = make(map[string]object) |
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b.nodes = nodes |
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return b, bucketMetadata, nil |
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} |
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// ListObjects - list all objects
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func (b bucket) ListObjects() (map[string]object, error) { |
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nodeSlice := 0 |
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for _, node := range b.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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for order, disk := range disks { |
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bucketSlice := fmt.Sprintf("%s$%d$%d", b.name, nodeSlice, order) |
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bucketPath := filepath.Join(b.donutName, bucketSlice) |
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objects, err := disk.ListDir(bucketPath) |
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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 _, object := range objects { |
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newObject, err := NewObject(object.Name(), filepath.Join(disk.GetPath(), bucketPath)) |
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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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newObjectMetadata, err := newObject.GetObjectMetadata() |
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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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objectName, ok := newObjectMetadata["object"] |
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if !ok { |
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return nil, iodine.New(ObjectCorrupted{Object: object.Name()}, nil) |
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} |
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b.objects[objectName] = newObject |
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} |
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} |
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nodeSlice = nodeSlice + 1 |
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} |
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return b.objects, nil |
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} |
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// GetObject - get object
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func (b bucket) GetObject(objectName string) (reader io.ReadCloser, size int64, err error) { |
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reader, writer := io.Pipe() |
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// get list of objects
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objects, err := b.ListObjects() |
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if err != nil { |
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return nil, 0, iodine.New(err, nil) |
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} |
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// check if object exists
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object, ok := objects[objectName] |
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if !ok { |
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return nil, 0, iodine.New(os.ErrNotExist, nil) |
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} |
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// verify if objectMetadata is readable, before we serve the request
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objectMetadata, err := object.GetObjectMetadata() |
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if err != nil { |
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return nil, 0, iodine.New(err, nil) |
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} |
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if objectName == "" || writer == nil || len(objectMetadata) == 0 { |
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return nil, 0, iodine.New(InvalidArgument{}, nil) |
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} |
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size, err = strconv.ParseInt(objectMetadata["size"], 10, 64) |
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if err != nil { |
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return nil, 0, iodine.New(err, nil) |
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} |
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// verify if donutObjectMetadata is readable, before we server the request
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donutObjectMetadata, err := object.GetDonutObjectMetadata() |
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if err != nil { |
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return nil, 0, iodine.New(err, nil) |
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} |
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// read and reply back to GetObject() request in a go-routine
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go b.readEncodedData(b.normalizeObjectName(objectName), writer, donutObjectMetadata) |
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return reader, size, nil |
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} |
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// PutObject - put a new object
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func (b bucket) PutObject(objectName string, objectData io.Reader, expectedMD5Sum string, metadata map[string]string) (string, error) { |
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if objectName == "" || objectData == nil { |
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return "", iodine.New(InvalidArgument{}, nil) |
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} |
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writers, err := b.getDiskWriters(b.normalizeObjectName(objectName), "data") |
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if err != nil { |
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return "", iodine.New(err, nil) |
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} |
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summer := md5.New() |
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objectMetadata := make(map[string]string) |
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donutObjectMetadata := make(map[string]string) |
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objectMetadata["version"] = objectMetadataVersion |
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donutObjectMetadata["version"] = donutObjectMetadataVersion |
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size := metadata["contentLength"] |
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sizeInt, err := strconv.ParseInt(size, 10, 64) |
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if err != nil { |
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return "", iodine.New(err, nil) |
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} |
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// if total writers are only '1' do not compute erasure
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switch len(writers) == 1 { |
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case true: |
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mw := io.MultiWriter(writers[0], summer) |
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totalLength, err := io.CopyN(mw, objectData, sizeInt) |
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if err != nil { |
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return "", iodine.New(err, nil) |
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} |
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donutObjectMetadata["sys.size"] = strconv.FormatInt(totalLength, 10) |
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objectMetadata["size"] = strconv.FormatInt(totalLength, 10) |
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case false: |
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// calculate data and parity dictated by total number of writers
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k, m, err := b.getDataAndParity(len(writers)) |
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if err != nil { |
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return "", iodine.New(err, nil) |
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} |
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// encoded data with k, m and write
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chunkCount, totalLength, err := b.writeEncodedData(k, m, writers, objectData, summer) |
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if err != nil { |
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return "", iodine.New(err, nil) |
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} |
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/// donutMetadata section
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donutObjectMetadata["sys.blockSize"] = strconv.Itoa(10 * 1024 * 1024) |
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donutObjectMetadata["sys.chunkCount"] = strconv.Itoa(chunkCount) |
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donutObjectMetadata["sys.erasureK"] = strconv.FormatUint(uint64(k), 10) |
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donutObjectMetadata["sys.erasureM"] = strconv.FormatUint(uint64(m), 10) |
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donutObjectMetadata["sys.erasureTechnique"] = "Cauchy" |
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donutObjectMetadata["sys.size"] = strconv.Itoa(totalLength) |
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// keep size inside objectMetadata as well for Object API requests
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objectMetadata["size"] = strconv.Itoa(totalLength) |
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} |
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objectMetadata["bucket"] = b.name |
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objectMetadata["object"] = objectName |
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// store all user provided metadata
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for k, v := range metadata { |
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objectMetadata[k] = v |
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} |
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dataMd5sum := summer.Sum(nil) |
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objectMetadata["created"] = time.Now().UTC().Format(time.RFC3339Nano) |
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// keeping md5sum for the object in two different places
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// one for object storage and another is for internal use
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objectMetadata["md5"] = hex.EncodeToString(dataMd5sum) |
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donutObjectMetadata["sys.md5"] = hex.EncodeToString(dataMd5sum) |
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// Verify if the written object is equal to what is expected, only if it is requested as such
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if strings.TrimSpace(expectedMD5Sum) != "" { |
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if err := b.isMD5SumEqual(strings.TrimSpace(expectedMD5Sum), objectMetadata["md5"]); err != nil { |
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return "", iodine.New(err, nil) |
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} |
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} |
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// write donut specific metadata
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if err := b.writeDonutObjectMetadata(b.normalizeObjectName(objectName), donutObjectMetadata); err != nil { |
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return "", iodine.New(err, nil) |
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} |
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// write object specific metadata
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if err := b.writeObjectMetadata(b.normalizeObjectName(objectName), objectMetadata); err != nil { |
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return "", iodine.New(err, nil) |
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} |
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// close all writers, when control flow reaches here
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for _, writer := range writers { |
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writer.Close() |
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} |
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return objectMetadata["md5"], nil |
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} |
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@ -1,184 +0,0 @@ |
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/* |
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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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"strings" |
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"github.com/minio/minio/pkg/iodine" |
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) |
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/// This file contains all the internal functions used by Object interface
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// getDiskWriters -
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func (d donut) getBucketMetadataWriters() ([]io.WriteCloser, error) { |
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var writers []io.WriteCloser |
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for _, node := range d.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, disk := range disks { |
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bucketMetaDataWriter, err := disk.CreateFile(filepath.Join(d.name, 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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func (d donut) getBucketMetadataReaders() ([]io.ReadCloser, error) { |
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var readers []io.ReadCloser |
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for _, node := range d.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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readers = make([]io.ReadCloser, len(disks)) |
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for order, disk := range disks { |
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bucketMetaDataReader, err := disk.OpenFile(filepath.Join(d.name, 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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readers[order] = bucketMetaDataReader |
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} |
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} |
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return readers, nil |
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} |
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//
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func (d donut) setDonutBucketMetadata(metadata map[string]map[string]string) error { |
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writers, err := d.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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defer writer.Close() |
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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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return iodine.New(err, nil) |
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} |
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} |
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return nil |
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} |
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func (d donut) getDonutBucketMetadata() (map[string]map[string]string, error) { |
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metadata := make(map[string]map[string]string) |
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readers, err := d.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 nil, iodine.New(err, nil) |
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} |
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} |
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return metadata, nil |
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} |
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func (d donut) makeDonutBucket(bucketName, acl string) error { |
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err := d.getDonutBuckets() |
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if err != nil { |
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return iodine.New(err, nil) |
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} |
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if _, ok := d.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, d.name, d.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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d.buckets[bucketName] = bucket |
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for _, node := range d.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(d.name, 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 := d.getDonutBucketMetadata() |
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if err != nil { |
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err = iodine.ToError(err) |
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if os.IsNotExist(err) { |
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metadata := make(map[string]map[string]string) |
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metadata[bucketName] = bucketMetadata |
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err = d.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[bucketName] = bucketMetadata |
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err = d.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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func (d donut) getDonutBuckets() error { |
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for _, node := range d.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 _, disk := range disks { |
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dirs, err := disk.ListDir(d.name) |
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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 NewBucket once we cache from makeDonutBucket()
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bucket, _, err := NewBucket(bucketName, "private", d.name, d.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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d.buckets[bucketName] = bucket |
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} |
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} |
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} |
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return nil |
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} |
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