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165 lines
4.3 KiB
165 lines
4.3 KiB
package inmemory
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import (
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"bytes"
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"crypto/sha256"
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"fmt"
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"io"
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"sort"
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"strings"
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"time"
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mstorage "github.com/minio-io/minio/pkg/storage"
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)
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type storage struct {
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bucketdata map[string]storedBucket
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objectdata map[string]storedObject
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}
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type storedBucket struct {
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metadata mstorage.BucketMetadata
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// owner string // TODO
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// id string // TODO
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}
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type storedObject struct {
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metadata mstorage.ObjectMetadata
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data []byte
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}
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func (storage *storage) CopyObjectToWriter(w io.Writer, bucket string, object string) (int64, error) {
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// TODO synchronize access
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// get object
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key := bucket + ":" + object
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if val, ok := storage.objectdata[key]; ok {
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objectBuffer := bytes.NewBuffer(val.data)
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written, err := io.Copy(w, objectBuffer)
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return written, err
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} else {
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return 0, mstorage.ObjectNotFound{Bucket: bucket, Object: object}
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}
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}
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func (storage *storage) StoreObject(bucket, key, contentType string, data io.Reader) error {
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objectKey := bucket + ":" + key
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if _, ok := storage.bucketdata[bucket]; ok == false {
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return mstorage.BucketNotFound{Bucket: bucket}
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}
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if _, ok := storage.objectdata[objectKey]; ok == true {
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return mstorage.ObjectExists{Bucket: bucket, Key: key}
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}
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if contentType == "" {
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contentType = "application/octet-stream"
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}
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contentType = strings.TrimSpace(contentType)
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var bytesBuffer bytes.Buffer
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var newObject = storedObject{}
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if _, ok := io.Copy(&bytesBuffer, data); ok == nil {
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size := bytesBuffer.Len()
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etag := fmt.Sprintf("%x", sha256.Sum256(bytesBuffer.Bytes()))
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newObject.metadata = mstorage.ObjectMetadata{
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Bucket: bucket,
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Key: key,
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ContentType: contentType,
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Created: time.Now(),
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ETag: etag,
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Size: int64(size),
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}
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newObject.data = bytesBuffer.Bytes()
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}
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storage.objectdata[objectKey] = newObject
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return nil
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}
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func (storage *storage) StoreBucket(bucketName string) error {
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if !mstorage.IsValidBucket(bucketName) {
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return mstorage.BucketNameInvalid{Bucket: bucketName}
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}
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if _, ok := storage.bucketdata[bucketName]; ok == true {
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return mstorage.BucketExists{Bucket: bucketName}
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}
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var newBucket = storedBucket{}
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newBucket.metadata = mstorage.BucketMetadata{}
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newBucket.metadata.Name = bucketName
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newBucket.metadata.Created = time.Now()
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storage.bucketdata[bucketName] = newBucket
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return nil
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}
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func (storage *storage) ListObjects(bucket, prefix string, count int) ([]mstorage.ObjectMetadata, bool, error) {
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if _, ok := storage.bucketdata[bucket]; ok == false {
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return []mstorage.ObjectMetadata{}, false, mstorage.BucketNotFound{Bucket: bucket}
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}
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// TODO prefix and count handling
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var results []mstorage.ObjectMetadata
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var keys []string
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for key := range storage.objectdata {
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if strings.HasPrefix(key, bucket+":"+prefix) {
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keys = append(keys, key)
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}
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}
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sort.Strings(keys)
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for _, key := range keys {
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if len(results) == count {
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return results, true, nil
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}
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object := storage.objectdata[key]
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if bucket == object.metadata.Bucket {
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if strings.HasPrefix(key, bucket+":") {
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results = append(results, object.metadata)
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}
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}
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}
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return results, false, nil
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}
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type ByBucketName []mstorage.BucketMetadata
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func (b ByBucketName) Len() int { return len(b) }
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func (b ByBucketName) Swap(i, j int) { b[i], b[j] = b[j], b[i] }
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func (b ByBucketName) Less(i, j int) bool { return b[i].Name < b[j].Name }
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func (storage *storage) ListBuckets(prefix string) ([]mstorage.BucketMetadata, error) {
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var results []mstorage.BucketMetadata
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for key, bucket := range storage.bucketdata {
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if strings.HasPrefix(key, prefix) {
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results = append(results, bucket.metadata)
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}
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}
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sort.Sort(ByBucketName(results))
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return results, nil
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}
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func Start() (chan<- string, <-chan error, *storage) {
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ctrlChannel := make(chan string)
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errorChannel := make(chan error)
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go start(ctrlChannel, errorChannel)
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return ctrlChannel, errorChannel, &storage{
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bucketdata: make(map[string]storedBucket),
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objectdata: make(map[string]storedObject),
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}
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}
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func start(ctrlChannel <-chan string, errorChannel chan<- error) {
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close(errorChannel)
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}
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func (storage *storage) GetObjectMetadata(bucket, key string) (mstorage.ObjectMetadata, error) {
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objectKey := bucket + ":" + key
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if object, ok := storage.objectdata[objectKey]; ok == true {
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return object.metadata, nil
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} else {
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return mstorage.ObjectMetadata{}, mstorage.ObjectNotFound{Bucket: bucket, Object: key}
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}
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}
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