mirror of
https://github.com/pgsty/minio.git
synced 2026-08-06 15:51:14 +03:00
Rename memory driver as cache
This commit is contained in:
Harshavardhana
Vendored
+513
@@ -0,0 +1,513 @@
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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 cache
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import (
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"bufio"
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"bytes"
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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"
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"log"
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"runtime/debug"
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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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"github.com/minio/minio/pkg/iodine"
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"github.com/minio/minio/pkg/storage/drivers"
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"github.com/minio/minio/pkg/storage/trove"
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)
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// cacheDriver - local variables
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type cacheDriver struct {
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storedBuckets map[string]storedBucket
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lock *sync.RWMutex
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objects *trove.Cache
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multiPartObjects *trove.Cache
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maxSize uint64
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expiration time.Duration
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}
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type storedBucket struct {
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bucketMetadata drivers.BucketMetadata
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objectMetadata map[string]drivers.ObjectMetadata
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partMetadata map[string]drivers.PartMetadata
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multiPartSession map[string]multiPartSession
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}
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type multiPartSession struct {
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totalParts int
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uploadID string
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initiated 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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// NewDriver instantiate a new cache driver
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func NewDriver(maxSize uint64, expiration time.Duration) (drivers.Driver, error) {
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cache := new(cacheDriver)
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cache.storedBuckets = make(map[string]storedBucket)
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cache.objects = trove.NewCache(maxSize, expiration)
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cache.maxSize = maxSize
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cache.expiration = expiration
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cache.multiPartObjects = trove.NewCache(0, time.Duration(0))
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cache.lock = new(sync.RWMutex)
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cache.objects.OnExpired = cache.expiredObject
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cache.multiPartObjects.OnExpired = cache.expiredPart
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// set up cache expiration
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cache.objects.ExpireObjects(time.Second * 5)
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return cache, nil
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}
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// GetObject - GET object from cache buffer
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func (cache *cacheDriver) GetObject(w io.Writer, bucket string, object string) (int64, error) {
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cache.lock.RLock()
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if !drivers.IsValidBucket(bucket) {
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cache.lock.RUnlock()
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return 0, iodine.New(drivers.BucketNameInvalid{Bucket: bucket}, nil)
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}
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if !drivers.IsValidObjectName(object) {
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cache.lock.RUnlock()
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return 0, iodine.New(drivers.ObjectNameInvalid{Object: object}, nil)
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}
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if _, ok := cache.storedBuckets[bucket]; ok == false {
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cache.lock.RUnlock()
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return 0, iodine.New(drivers.BucketNotFound{Bucket: bucket}, nil)
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}
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objectKey := bucket + "/" + object
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data, ok := cache.objects.Get(objectKey)
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if !ok {
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cache.lock.RUnlock()
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return 0, iodine.New(drivers.ObjectNotFound{Bucket: bucket, Object: object}, nil)
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}
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written, err := io.Copy(w, bytes.NewBuffer(data))
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cache.lock.RUnlock()
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return written, iodine.New(err, nil)
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}
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// GetPartialObject - GET object from cache buffer range
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func (cache *cacheDriver) GetPartialObject(w io.Writer, bucket, object string, start, length int64) (int64, 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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"start": strconv.FormatInt(start, 10),
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"length": strconv.FormatInt(length, 10),
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}
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cache.lock.RLock()
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if !drivers.IsValidBucket(bucket) {
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cache.lock.RUnlock()
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return 0, iodine.New(drivers.BucketNameInvalid{Bucket: bucket}, errParams)
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}
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if !drivers.IsValidObjectName(object) {
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cache.lock.RUnlock()
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return 0, iodine.New(drivers.ObjectNameInvalid{Object: object}, errParams)
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}
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if start < 0 {
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return 0, iodine.New(drivers.InvalidRange{
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Start: start,
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Length: length,
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}, errParams)
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}
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objectKey := bucket + "/" + object
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data, ok := cache.objects.Get(objectKey)
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if !ok {
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cache.lock.RUnlock()
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return 0, iodine.New(drivers.ObjectNotFound{Bucket: bucket, Object: object}, errParams)
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}
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written, err := io.CopyN(w, bytes.NewBuffer(data[start:]), length)
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cache.lock.RUnlock()
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return written, iodine.New(err, nil)
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}
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// GetBucketMetadata -
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func (cache *cacheDriver) GetBucketMetadata(bucket string) (drivers.BucketMetadata, error) {
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cache.lock.RLock()
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defer cache.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 := cache.storedBuckets[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 cache.storedBuckets[bucket].bucketMetadata, nil
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}
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// SetBucketMetadata -
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func (cache *cacheDriver) SetBucketMetadata(bucket, acl string) error {
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cache.lock.RLock()
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if !drivers.IsValidBucket(bucket) {
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cache.lock.RUnlock()
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return iodine.New(drivers.BucketNameInvalid{Bucket: bucket}, nil)
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}
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if _, ok := cache.storedBuckets[bucket]; ok == false {
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cache.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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cache.lock.RUnlock()
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cache.lock.Lock()
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defer cache.lock.Unlock()
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storedBucket := cache.storedBuckets[bucket]
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storedBucket.bucketMetadata.ACL = drivers.BucketACL(acl)
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cache.storedBuckets[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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func (cache *cacheDriver) CreateObject(bucket, key, contentType, expectedMD5Sum string, size int64, data io.Reader) (string, error) {
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if size > int64(cache.maxSize) {
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generic := drivers.GenericObjectError{Bucket: bucket, Object: key}
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return "", iodine.New(drivers.EntityTooLarge{
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GenericObjectError: generic,
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Size: strconv.FormatInt(size, 10),
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MaxSize: strconv.FormatUint(cache.maxSize, 10),
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}, nil)
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}
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md5sum, err := cache.createObject(bucket, key, contentType, expectedMD5Sum, size, data)
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// free
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debug.FreeOSMemory()
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return md5sum, iodine.New(err, nil)
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}
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// createObject - PUT object to cache buffer
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func (cache *cacheDriver) createObject(bucket, key, contentType, expectedMD5Sum string, size int64, data io.Reader) (string, error) {
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cache.lock.RLock()
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if !drivers.IsValidBucket(bucket) {
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cache.lock.RUnlock()
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return "", iodine.New(drivers.BucketNameInvalid{Bucket: bucket}, nil)
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}
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if !drivers.IsValidObjectName(key) {
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cache.lock.RUnlock()
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return "", iodine.New(drivers.ObjectNameInvalid{Object: key}, nil)
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}
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if _, ok := cache.storedBuckets[bucket]; ok == false {
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cache.lock.RUnlock()
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return "", iodine.New(drivers.BucketNotFound{Bucket: bucket}, nil)
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}
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storedBucket := cache.storedBuckets[bucket]
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// get object key
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objectKey := bucket + "/" + key
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if _, ok := storedBucket.objectMetadata[objectKey]; ok == true {
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cache.lock.RUnlock()
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return "", iodine.New(drivers.ObjectExists{Bucket: bucket, Object: key}, nil)
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}
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cache.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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// calculate md5
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hash := md5.New()
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var readBytes []byte
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var err error
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var length int
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for err == nil {
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byteBuffer := make([]byte, 1024*1024)
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length, err = data.Read(byteBuffer)
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// While hash.Write() wouldn't mind a Nil byteBuffer
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// It is necessary for us to verify this and break
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if length == 0 {
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break
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}
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hash.Write(byteBuffer[0:length])
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readBytes = append(readBytes, byteBuffer[0:length]...)
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}
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if err != io.EOF {
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return "", iodine.New(err, nil)
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}
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md5SumBytes := hash.Sum(nil)
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totalLength := len(readBytes)
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cache.lock.Lock()
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ok := cache.objects.Set(objectKey, readBytes)
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// setting up for de-allocation
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readBytes = nil
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go debug.FreeOSMemory()
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cache.lock.Unlock()
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if !ok {
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return "", iodine.New(drivers.InternalError{}, nil)
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}
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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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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 := 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().UTC(),
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Md5: md5Sum,
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Size: int64(totalLength),
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}
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cache.lock.Lock()
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storedBucket.objectMetadata[objectKey] = newObject
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cache.storedBuckets[bucket] = storedBucket
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cache.lock.Unlock()
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return newObject.Md5, nil
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}
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// CreateBucket - create bucket in cache
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func (cache *cacheDriver) CreateBucket(bucketName, acl string) error {
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cache.lock.RLock()
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if len(cache.storedBuckets) == totalBuckets {
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cache.lock.RUnlock()
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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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cache.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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cache.lock.RUnlock()
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return iodine.New(drivers.InvalidACL{ACL: acl}, nil)
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}
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if _, ok := cache.storedBuckets[bucketName]; ok == true {
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cache.lock.RUnlock()
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return iodine.New(drivers.BucketExists{Bucket: bucketName}, nil)
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}
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cache.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.objectMetadata = make(map[string]drivers.ObjectMetadata)
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newBucket.multiPartSession = make(map[string]multiPartSession)
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newBucket.partMetadata = make(map[string]drivers.PartMetadata)
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newBucket.bucketMetadata = drivers.BucketMetadata{}
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newBucket.bucketMetadata.Name = bucketName
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newBucket.bucketMetadata.Created = time.Now().UTC()
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newBucket.bucketMetadata.ACL = drivers.BucketACL(acl)
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cache.lock.Lock()
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cache.storedBuckets[bucketName] = newBucket
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cache.lock.Unlock()
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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 (cache *cacheDriver) filterDelimiterPrefix(keys []string, key, delim string, r drivers.BucketResourcesMetadata) ([]string, drivers.BucketResourcesMetadata) {
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switch true {
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case key == r.Prefix:
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keys = appendUniq(keys, key)
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// delim - requires r.Prefix as it was trimmed off earlier
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case key == r.Prefix+delim:
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keys = appendUniq(keys, key)
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case delim != "":
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r.CommonPrefixes = appendUniq(r.CommonPrefixes, r.Prefix+delim)
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}
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return keys, r
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}
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func (cache *cacheDriver) listObjects(keys []string, key string, r 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 r.IsDelimiterSet():
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delim := delimiter(key, r.Delimiter)
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switch true {
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case delim == "" || delim == key:
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keys = appendUniq(keys, key)
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case delim != "":
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r.CommonPrefixes = appendUniq(r.CommonPrefixes, delim)
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}
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// Prefix present, delimit object key with prefix key based on delimiter
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case r.IsDelimiterPrefixSet():
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if strings.HasPrefix(key, r.Prefix) {
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trimmedName := strings.TrimPrefix(key, r.Prefix)
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delim := delimiter(trimmedName, r.Delimiter)
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keys, r = cache.filterDelimiterPrefix(keys, key, delim, r)
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}
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// Prefix present, nothing to delimit
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case r.IsPrefixSet():
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keys = appendUniq(keys, key)
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// Prefix and delimiter absent
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case r.IsDefault():
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keys = appendUniq(keys, key)
|
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}
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return keys, r
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}
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|
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// ListObjects - list objects from cache
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func (cache *cacheDriver) ListObjects(bucket string, resources drivers.BucketResourcesMetadata) ([]drivers.ObjectMetadata, drivers.BucketResourcesMetadata, error) {
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cache.lock.RLock()
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defer cache.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.IsValidObjectName(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 := cache.storedBuckets[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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storedBucket := cache.storedBuckets[bucket]
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for key := range storedBucket.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 = cache.listObjects(keys, key, resources)
|
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}
|
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}
|
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var newKeys []string
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switch {
|
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case resources.Marker != "":
|
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for _, key := range keys {
|
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if key > resources.Marker {
|
||||
newKeys = appendUniq(newKeys, key)
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||||
}
|
||||
}
|
||||
default:
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||||
newKeys = keys
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||||
}
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||||
sort.Strings(newKeys)
|
||||
for _, key := range newKeys {
|
||||
if len(results) == resources.Maxkeys {
|
||||
resources.IsTruncated = true
|
||||
if resources.IsTruncated && resources.IsDelimiterSet() {
|
||||
resources.NextMarker = results[len(results)-1].Key
|
||||
}
|
||||
return results, resources, nil
|
||||
}
|
||||
object := storedBucket.objectMetadata[bucket+"/"+key]
|
||||
results = append(results, object)
|
||||
}
|
||||
return results, resources, nil
|
||||
}
|
||||
|
||||
// byBucketName is a type for sorting bucket metadata by bucket name
|
||||
type byBucketName []drivers.BucketMetadata
|
||||
|
||||
func (b byBucketName) Len() int { return len(b) }
|
||||
func (b byBucketName) Swap(i, j int) { b[i], b[j] = b[j], b[i] }
|
||||
func (b byBucketName) Less(i, j int) bool { return b[i].Name < b[j].Name }
|
||||
|
||||
// ListBuckets - List buckets from cache
|
||||
func (cache *cacheDriver) ListBuckets() ([]drivers.BucketMetadata, error) {
|
||||
cache.lock.RLock()
|
||||
defer cache.lock.RUnlock()
|
||||
var results []drivers.BucketMetadata
|
||||
for _, bucket := range cache.storedBuckets {
|
||||
results = append(results, bucket.bucketMetadata)
|
||||
}
|
||||
sort.Sort(byBucketName(results))
|
||||
return results, nil
|
||||
}
|
||||
|
||||
// GetObjectMetadata - get object metadata from cache
|
||||
func (cache *cacheDriver) GetObjectMetadata(bucket, key string) (drivers.ObjectMetadata, error) {
|
||||
cache.lock.RLock()
|
||||
defer cache.lock.RUnlock()
|
||||
// check if bucket exists
|
||||
if !drivers.IsValidBucket(bucket) {
|
||||
return drivers.ObjectMetadata{}, iodine.New(drivers.BucketNameInvalid{Bucket: bucket}, nil)
|
||||
}
|
||||
if !drivers.IsValidObjectName(key) {
|
||||
return drivers.ObjectMetadata{}, iodine.New(drivers.ObjectNameInvalid{Object: key}, nil)
|
||||
}
|
||||
if _, ok := cache.storedBuckets[bucket]; ok == false {
|
||||
return drivers.ObjectMetadata{}, iodine.New(drivers.BucketNotFound{Bucket: bucket}, nil)
|
||||
}
|
||||
storedBucket := cache.storedBuckets[bucket]
|
||||
objectKey := bucket + "/" + key
|
||||
if object, ok := storedBucket.objectMetadata[objectKey]; ok == true {
|
||||
return object, nil
|
||||
}
|
||||
return drivers.ObjectMetadata{}, iodine.New(drivers.ObjectNotFound{Bucket: bucket, Object: key}, nil)
|
||||
}
|
||||
|
||||
func (cache *cacheDriver) expiredObject(a ...interface{}) {
|
||||
cacheStats := cache.objects.Stats()
|
||||
log.Printf("CurrentSize: %d, CurrentItems: %d, TotalExpirations: %d",
|
||||
cacheStats.Bytes, cacheStats.Items, cacheStats.Expired)
|
||||
key := a[0].(string)
|
||||
// loop through all buckets
|
||||
for bucket, storedBucket := range cache.storedBuckets {
|
||||
delete(storedBucket.objectMetadata, key)
|
||||
// remove bucket if no objects found anymore
|
||||
if len(storedBucket.objectMetadata) == 0 {
|
||||
if time.Since(cache.storedBuckets[bucket].bucketMetadata.Created) > cache.expiration {
|
||||
delete(cache.storedBuckets, bucket)
|
||||
}
|
||||
}
|
||||
}
|
||||
debug.FreeOSMemory()
|
||||
}
|
||||
Reference in New Issue
Block a user