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533 lines
17 KiB
533 lines
17 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 memory
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import (
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"bufio"
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"bytes"
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"io"
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"sort"
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"strconv"
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"strings"
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"sync"
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"time"
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"crypto/md5"
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"encoding/base64"
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"encoding/hex"
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"errors"
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"io/ioutil"
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"github.com/minio-io/minio/pkg/iodine"
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"github.com/minio-io/minio/pkg/storage/drivers"
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"github.com/minio-io/minio/pkg/storage/drivers/memory/lru"
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"github.com/minio-io/minio/pkg/utils/log"
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"github.com/minio-io/minio/pkg/utils/split"
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)
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// memoryDriver - local variables
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type memoryDriver struct {
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bucketMetadata map[string]storedBucket
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objectMetadata map[string]storedObject
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objects *lru.Cache
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lock *sync.RWMutex
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totalSize uint64
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maxSize uint64
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expiration time.Duration
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shutdown bool
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}
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type storedBucket struct {
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metadata drivers.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 drivers.ObjectMetadata
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lastAccessed time.Time
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}
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const (
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totalBuckets = 100
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)
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// Start memory object server
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func Start(maxSize uint64, expiration time.Duration) (chan<- string, <-chan error, drivers.Driver) {
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ctrlChannel := make(chan string)
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errorChannel := make(chan error)
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var memory *memoryDriver
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memory = new(memoryDriver)
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memory.bucketMetadata = make(map[string]storedBucket)
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memory.objectMetadata = make(map[string]storedObject)
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memory.objects = lru.New(0)
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memory.lock = new(sync.RWMutex)
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memory.expiration = expiration
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memory.shutdown = false
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switch {
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case maxSize == 0:
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memory.maxSize = 9223372036854775807
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case maxSize > 0:
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memory.maxSize = maxSize
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default:
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log.Println("Error")
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}
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memory.objects.OnEvicted = memory.evictObject
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// set up memory expiration
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go memory.expireObjects()
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go start(ctrlChannel, errorChannel)
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return ctrlChannel, errorChannel, memory
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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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// GetObject - GET object from memory buffer
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func (memory *memoryDriver) GetObject(w io.Writer, bucket string, object string) (int64, error) {
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memory.lock.RLock()
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defer memory.lock.RUnlock()
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if !drivers.IsValidBucket(bucket) {
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return 0, iodine.New(drivers.BucketNameInvalid{Bucket: bucket}, nil)
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}
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if !drivers.IsValidObject(object) {
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return 0, iodine.New(drivers.ObjectNameInvalid{Object: object}, nil)
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}
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if _, ok := memory.bucketMetadata[bucket]; ok == false {
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return 0, iodine.New(drivers.BucketNotFound{Bucket: bucket}, nil)
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}
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// get object
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objectKey := bucket + "/" + object
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if _, ok := memory.objectMetadata[objectKey]; ok {
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if data, ok := memory.objects.Get(objectKey); ok {
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dataSlice := data.([]byte)
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objectBuffer := bytes.NewBuffer(dataSlice)
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written, err := io.Copy(w, objectBuffer)
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go memory.updateAccessTime(objectKey)
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return written, iodine.New(err, nil)
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}
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}
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return 0, iodine.New(drivers.ObjectNotFound{Bucket: bucket, Object: object}, nil)
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}
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// GetPartialObject - GET object from memory buffer range
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func (memory *memoryDriver) GetPartialObject(w io.Writer, bucket, object string, start, length int64) (int64, error) {
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memory.lock.RLock()
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defer memory.lock.RUnlock()
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var sourceBuffer bytes.Buffer
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if !drivers.IsValidBucket(bucket) {
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return 0, iodine.New(drivers.BucketNameInvalid{Bucket: bucket}, nil)
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}
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if !drivers.IsValidObject(object) {
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return 0, iodine.New(drivers.ObjectNameInvalid{Object: object}, nil)
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}
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if _, err := memory.GetObject(&sourceBuffer, bucket, object); err != nil {
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return 0, iodine.New(err, nil)
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}
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if _, err := io.CopyN(ioutil.Discard, &sourceBuffer, start); err != nil {
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return 0, iodine.New(err, nil)
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}
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return io.CopyN(w, &sourceBuffer, length)
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}
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// GetBucketMetadata -
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func (memory *memoryDriver) GetBucketMetadata(bucket string) (drivers.BucketMetadata, error) {
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memory.lock.RLock()
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defer memory.lock.RUnlock()
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if !drivers.IsValidBucket(bucket) {
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return drivers.BucketMetadata{}, iodine.New(drivers.BucketNameInvalid{Bucket: bucket}, nil)
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}
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if _, ok := memory.bucketMetadata[bucket]; ok == false {
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return drivers.BucketMetadata{}, iodine.New(drivers.BucketNotFound{Bucket: bucket}, nil)
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}
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return memory.bucketMetadata[bucket].metadata, nil
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}
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// SetBucketMetadata -
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func (memory *memoryDriver) SetBucketMetadata(bucket, acl string) error {
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memory.lock.RLock()
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if !drivers.IsValidBucket(bucket) {
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memory.lock.RUnlock()
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return iodine.New(drivers.BucketNameInvalid{Bucket: bucket}, nil)
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}
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if _, ok := memory.bucketMetadata[bucket]; ok == false {
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memory.lock.RUnlock()
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return iodine.New(drivers.BucketNotFound{Bucket: bucket}, nil)
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}
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if strings.TrimSpace(acl) == "" {
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acl = "private"
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}
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memory.lock.RUnlock()
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memory.lock.Lock()
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defer memory.lock.Unlock()
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storedBucket := memory.bucketMetadata[bucket]
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storedBucket.metadata.ACL = drivers.BucketACL(acl)
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memory.bucketMetadata[bucket] = storedBucket
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return nil
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}
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// isMD5SumEqual - returns error if md5sum mismatches, success its `nil`
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func isMD5SumEqual(expectedMD5Sum, actualMD5Sum string) error {
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if strings.TrimSpace(expectedMD5Sum) != "" && strings.TrimSpace(actualMD5Sum) != "" {
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expectedMD5SumBytes, err := hex.DecodeString(expectedMD5Sum)
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if err != nil {
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return iodine.New(err, nil)
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}
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actualMD5SumBytes, err := hex.DecodeString(actualMD5Sum)
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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 !bytes.Equal(expectedMD5SumBytes, actualMD5SumBytes) {
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return iodine.New(errors.New("bad digest, md5sum mismatch"), nil)
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}
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return nil
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}
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return iodine.New(errors.New("invalid argument"), nil)
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}
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// CreateObject - PUT object to memory buffer
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func (memory *memoryDriver) CreateObject(bucket, key, contentType, expectedMD5Sum string, data io.Reader) error {
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memory.lock.RLock()
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if !drivers.IsValidBucket(bucket) {
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memory.lock.RUnlock()
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return iodine.New(drivers.BucketNameInvalid{Bucket: bucket}, nil)
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}
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if !drivers.IsValidObject(key) {
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memory.lock.RUnlock()
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return iodine.New(drivers.ObjectNameInvalid{Object: key}, nil)
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}
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if _, ok := memory.bucketMetadata[bucket]; ok == false {
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memory.lock.RUnlock()
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return iodine.New(drivers.BucketNotFound{Bucket: bucket}, nil)
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}
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objectKey := bucket + "/" + key
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if _, ok := memory.objectMetadata[objectKey]; ok == true {
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memory.lock.RUnlock()
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return iodine.New(drivers.ObjectExists{Bucket: bucket, Object: key}, nil)
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}
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memory.lock.RUnlock()
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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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if strings.TrimSpace(expectedMD5Sum) != "" {
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expectedMD5SumBytes, err := base64.StdEncoding.DecodeString(strings.TrimSpace(expectedMD5Sum))
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if err != nil {
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// pro-actively close the connection
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return iodine.New(drivers.InvalidDigest{Md5: expectedMD5Sum}, nil)
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}
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expectedMD5Sum = hex.EncodeToString(expectedMD5SumBytes)
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}
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var bytesBuffer bytes.Buffer
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var newObject = storedObject{}
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chunks := split.Stream(data, 10*1024*1024)
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totalLength := 0
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summer := md5.New()
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for chunk := range chunks {
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if chunk.Err == nil {
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totalLength = totalLength + len(chunk.Data)
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summer.Write(chunk.Data)
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_, err := io.Copy(&bytesBuffer, bytes.NewBuffer(chunk.Data))
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if err != nil {
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err := iodine.New(err, nil)
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log.Println(err)
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return err
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}
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if uint64(totalLength)+memory.totalSize > memory.maxSize {
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memory.objects.RemoveOldest()
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return iodine.New(drivers.EntityTooLarge{
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Size: strconv.FormatInt(int64(totalLength), 10),
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TotalSize: strconv.FormatUint(memory.totalSize, 10),
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MaxSize: strconv.FormatUint(memory.maxSize, 10),
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}, nil)
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}
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}
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}
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md5SumBytes := summer.Sum(nil)
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md5Sum := hex.EncodeToString(md5SumBytes)
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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 := isMD5SumEqual(strings.TrimSpace(expectedMD5Sum), md5Sum); err != nil {
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memory.objects.RemoveOldest()
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return iodine.New(drivers.BadDigest{Md5: expectedMD5Sum, Bucket: bucket, Key: key}, nil)
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}
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}
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newObject.metadata = drivers.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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Md5: md5Sum,
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Size: int64(totalLength),
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}
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newObject.lastAccessed = time.Now()
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memory.lock.Lock()
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if _, ok := memory.objectMetadata[objectKey]; ok == true {
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memory.objects.RemoveOldest()
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memory.lock.Unlock()
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return iodine.New(drivers.ObjectExists{Bucket: bucket, Object: key}, nil)
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}
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// could lead to out of Memory, verify and proceed
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if uint64(bytesBuffer.Len())+memory.totalSize > memory.maxSize {
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memory.objects.RemoveOldest()
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memory.lock.Unlock()
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return iodine.New(drivers.EntityTooLarge{
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Size: strconv.FormatInt(int64(bytesBuffer.Len()), 10),
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TotalSize: strconv.FormatUint(memory.totalSize, 10),
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MaxSize: strconv.FormatUint(memory.maxSize, 10),
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}, nil)
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}
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memory.objectMetadata[objectKey] = newObject
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memory.objects.Add(objectKey, bytesBuffer.Bytes())
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memory.totalSize = memory.totalSize + uint64(newObject.metadata.Size)
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if memory.totalSize > memory.maxSize {
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memory.objects.RemoveOldest()
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}
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log.Println("Size:", memory.totalSize)
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memory.lock.Unlock()
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return nil
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}
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// CreateBucket - create bucket in memory
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func (memory *memoryDriver) CreateBucket(bucketName, acl string) error {
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memory.lock.RLock()
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if len(memory.bucketMetadata) == totalBuckets {
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memory.lock.RLock()
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return iodine.New(drivers.TooManyBuckets{Bucket: bucketName}, nil)
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}
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if !drivers.IsValidBucket(bucketName) {
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memory.lock.RUnlock()
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return iodine.New(drivers.BucketNameInvalid{Bucket: bucketName}, nil)
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}
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if !drivers.IsValidBucketACL(acl) {
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memory.lock.RUnlock()
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return iodine.New(drivers.InvalidACL{ACL: acl}, nil)
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}
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if _, ok := memory.bucketMetadata[bucketName]; ok == true {
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memory.lock.RUnlock()
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return iodine.New(drivers.BucketExists{Bucket: bucketName}, nil)
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}
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memory.lock.RUnlock()
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if strings.TrimSpace(acl) == "" {
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// default is private
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acl = "private"
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}
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var newBucket = storedBucket{}
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newBucket.metadata = drivers.BucketMetadata{}
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newBucket.metadata.Name = bucketName
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newBucket.metadata.Created = time.Now()
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newBucket.metadata.ACL = drivers.BucketACL(acl)
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memory.lock.Lock()
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defer memory.lock.Unlock()
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memory.bucketMetadata[bucketName] = newBucket
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return nil
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}
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func delimiter(object, delimiter string) string {
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readBuffer := bytes.NewBufferString(object)
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reader := bufio.NewReader(readBuffer)
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stringReader := strings.NewReader(delimiter)
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delimited, _ := stringReader.ReadByte()
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delimitedStr, _ := reader.ReadString(delimited)
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return delimitedStr
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}
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func appendUniq(slice []string, i string) []string {
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for _, ele := range slice {
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if ele == i {
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return slice
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}
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}
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return append(slice, i)
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}
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func (memory *memoryDriver) filterDelimiterPrefix(keys []string, key, delimitedName string, resources drivers.BucketResourcesMetadata) (drivers.BucketResourcesMetadata, []string) {
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switch true {
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case key == resources.Prefix:
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keys = appendUniq(keys, key)
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// DelimitedName - requires resources.Prefix as it was trimmed off earlier in the flow
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case key == resources.Prefix+delimitedName:
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keys = appendUniq(keys, key)
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case delimitedName != "":
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resources.CommonPrefixes = appendUniq(resources.CommonPrefixes, resources.Prefix+delimitedName)
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}
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return resources, keys
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}
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func (memory *memoryDriver) listObjectsInternal(keys []string, key string, resources drivers.BucketResourcesMetadata) ([]string, drivers.BucketResourcesMetadata) {
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switch true {
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// Prefix absent, delimit object key based on delimiter
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case resources.IsDelimiterSet():
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delimitedName := delimiter(key, resources.Delimiter)
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switch true {
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case delimitedName == "" || delimitedName == key:
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keys = appendUniq(keys, key)
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case delimitedName != "":
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resources.CommonPrefixes = appendUniq(resources.CommonPrefixes, delimitedName)
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}
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// Prefix present, delimit object key with prefix key based on delimiter
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case resources.IsDelimiterPrefixSet():
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if strings.HasPrefix(key, resources.Prefix) {
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trimmedName := strings.TrimPrefix(key, resources.Prefix)
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delimitedName := delimiter(trimmedName, resources.Delimiter)
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resources, keys = memory.filterDelimiterPrefix(keys, key, delimitedName, resources)
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}
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// Prefix present, nothing to delimit
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case resources.IsPrefixSet():
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keys = appendUniq(keys, key)
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// Prefix and delimiter absent
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case resources.IsDefault():
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keys = appendUniq(keys, key)
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}
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return keys, resources
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}
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// ListObjects - list objects from memory
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func (memory *memoryDriver) ListObjects(bucket string, resources drivers.BucketResourcesMetadata) ([]drivers.ObjectMetadata, drivers.BucketResourcesMetadata, error) {
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memory.lock.RLock()
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defer memory.lock.RUnlock()
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if !drivers.IsValidBucket(bucket) {
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return nil, drivers.BucketResourcesMetadata{IsTruncated: false}, iodine.New(drivers.BucketNameInvalid{Bucket: bucket}, nil)
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}
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if !drivers.IsValidObject(resources.Prefix) {
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return nil, drivers.BucketResourcesMetadata{IsTruncated: false}, iodine.New(drivers.ObjectNameInvalid{Object: resources.Prefix}, nil)
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}
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if _, ok := memory.bucketMetadata[bucket]; ok == false {
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return nil, drivers.BucketResourcesMetadata{IsTruncated: false}, iodine.New(drivers.BucketNotFound{Bucket: bucket}, nil)
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}
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var results []drivers.ObjectMetadata
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var keys []string
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for key := range memory.objectMetadata {
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if strings.HasPrefix(key, bucket+"/") {
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key = key[len(bucket)+1:]
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keys, resources = memory.listObjectsInternal(keys, key, resources)
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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) == resources.Maxkeys {
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resources.IsTruncated = true
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return results, resources, nil
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}
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object := memory.objectMetadata[bucket+"/"+key]
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if bucket == object.metadata.Bucket {
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results = append(results, object.metadata)
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}
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}
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return results, resources, nil
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}
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// ByBucketName is a type for sorting bucket metadata by bucket name
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type ByBucketName []drivers.BucketMetadata
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// Len of bucket name
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func (b ByBucketName) Len() int { return len(b) }
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// Swap bucket i, j
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func (b ByBucketName) Swap(i, j int) { b[i], b[j] = b[j], b[i] }
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// Less
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func (b ByBucketName) Less(i, j int) bool { return b[i].Name < b[j].Name }
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// ListBuckets - List buckets from memory
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func (memory *memoryDriver) ListBuckets() ([]drivers.BucketMetadata, error) {
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memory.lock.RLock()
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defer memory.lock.RUnlock()
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var results []drivers.BucketMetadata
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for _, bucket := range memory.bucketMetadata {
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results = append(results, bucket.metadata)
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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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// GetObjectMetadata - get object metadata from memory
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func (memory *memoryDriver) GetObjectMetadata(bucket, key, prefix string) (drivers.ObjectMetadata, error) {
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memory.lock.RLock()
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defer memory.lock.RUnlock()
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// check if bucket exists
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if !drivers.IsValidBucket(bucket) {
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return drivers.ObjectMetadata{}, iodine.New(drivers.BucketNameInvalid{Bucket: bucket}, nil)
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}
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if !drivers.IsValidObject(key) || !drivers.IsValidObject(prefix) {
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return drivers.ObjectMetadata{}, iodine.New(drivers.ObjectNameInvalid{Object: key}, nil)
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}
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if _, ok := memory.bucketMetadata[bucket]; ok == false {
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return drivers.ObjectMetadata{}, iodine.New(drivers.BucketNotFound{Bucket: bucket}, nil)
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}
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objectKey := bucket + "/" + key
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if object, ok := memory.objectMetadata[objectKey]; ok == true {
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return object.metadata, nil
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}
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return drivers.ObjectMetadata{}, iodine.New(drivers.ObjectNotFound{Bucket: bucket, Object: key}, nil)
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}
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func (memory *memoryDriver) evictObject(key lru.Key, value interface{}) {
|
|
k := key.(string)
|
|
memory.totalSize = memory.totalSize - uint64(memory.objectMetadata[k].metadata.Size)
|
|
log.Println("evicting:", k, memory.objectMetadata[k].metadata.Size)
|
|
log.Println("Size:", memory.totalSize)
|
|
delete(memory.objectMetadata, k)
|
|
}
|
|
|
|
func (memory *memoryDriver) expireObjects() {
|
|
for {
|
|
if memory.shutdown {
|
|
return
|
|
}
|
|
var sleepDuration time.Duration
|
|
memory.lock.Lock()
|
|
if len(memory.objectMetadata) > 0 {
|
|
if k, _, ok := memory.objects.GetOldest(); ok {
|
|
key := k.(string)
|
|
object := memory.objectMetadata[key]
|
|
if time.Now().Sub(object.lastAccessed) > memory.expiration {
|
|
memory.objects.RemoveOldest()
|
|
} else {
|
|
sleepDuration = memory.expiration - time.Now().Sub(object.lastAccessed)
|
|
}
|
|
}
|
|
} else {
|
|
sleepDuration = memory.expiration
|
|
}
|
|
memory.lock.Unlock()
|
|
time.Sleep(sleepDuration)
|
|
}
|
|
}
|
|
|
|
func (memory *memoryDriver) updateAccessTime(key string) {
|
|
memory.lock.Lock()
|
|
defer memory.lock.Unlock()
|
|
if object, ok := memory.objectMetadata[key]; ok {
|
|
object.lastAccessed = time.Now()
|
|
memory.objectMetadata[key] = object
|
|
}
|
|
}
|
|
|