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service_object.go
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service_object.go
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package object
import (
"context"
"errors"
"github.com/bittorrent/go-btfs/s3/action"
"github.com/bittorrent/go-btfs/s3/api/providers"
"github.com/bittorrent/go-btfs/s3/utils"
"io"
"strings"
"time"
)
// PutObject put a user specified object
func (s *service) PutObject(ctx context.Context, args *PutObjectArgs) (object *Object, err error) {
// Operation context
ctx, cancel := s.opctx(ctx)
defer cancel()
// Bucket key
buckey := s.getBucketKey(args.Bucket)
// RLock bucket
err = s.lock.RLock(ctx, buckey)
if err != nil {
return
}
defer s.lock.RUnlock(buckey)
// Get bucket
bucket, err := s.getBucket(buckey)
if err != nil {
return
}
if bucket == nil {
err = ErrBucketNotFound
return
}
// Check action ACL
allow := s.checkACL(bucket.Owner, bucket.ACL, args.UserId, action.PutObjectAction)
if !allow {
err = ErrNotAllowed
return
}
// Object key
objkey := s.getObjectKey(args.Bucket, args.Object)
// Lock object
err = s.lock.Lock(ctx, objkey)
if err != nil {
return
}
defer s.lock.Unlock(objkey)
// Get old object
objectOld, err := s.getObject(objkey)
if err != nil {
return
}
// Store object body
cid, err := s.storeBody(ctx, args.Body, objkey)
if err != nil {
return
}
// Init a flag to mark if the object body should be removed, this
// flag will be set to false if the object has been successfully put
var removeObjectBody = true
// Try to remove stored body if put object failed
defer func() {
if removeObjectBody {
_ = s.removeBody(ctx, cid, objkey)
}
}()
// now
now := time.Now().UTC()
// new object
object = &Object{
Bucket: args.Bucket,
Name: args.Object,
ModTime: now,
Size: args.ContentLength,
IsDir: false,
ETag: args.Body.ETag().String(),
CID: cid,
VersionID: "",
IsLatest: true,
DeleteMarker: false,
ACL: "",
ContentType: args.ContentType,
ContentEncoding: args.ContentEncoding,
SuccessorModTime: now,
Expires: args.Expires,
}
// put object
err = s.putObject(objkey, object)
if err != nil {
return
}
// Set remove object body flag to false, because it has been referenced by the object
removeObjectBody = false
// Try to remove old object body if exists, because it has been covered by new one
if objectOld != nil {
_ = s.removeBody(ctx, objectOld.CID, objkey)
}
return
}
// CopyObject copy from a user specified source object to a desert object
func (s *service) CopyObject(ctx context.Context, args *CopyObjectArgs) (dstObject *Object, err error) {
// Operation context
ctx, cancel := s.opctx(ctx)
defer cancel()
// Source bucket key
srcBuckey := s.getBucketKey(args.SrcBucket)
// RLock source bucket
err = s.lock.RLock(ctx, srcBuckey)
if err != nil {
return
}
defer s.lock.RUnlock(srcBuckey)
// Get source bucket
srcBucket, err := s.getBucket(srcBuckey)
if err != nil {
return
}
if srcBucket == nil {
err = ErrBucketNotFound
return
}
// Check source action ACL
srcAllow := s.checkACL(srcBucket.Owner, srcBucket.ACL, args.UserId, action.GetObjectAction)
if !srcAllow {
err = ErrNotAllowed
return
}
// Source object key
srcObjkey := s.getObjectKey(args.SrcBucket, args.SrcObject)
// RLock source object
err = s.lock.RLock(ctx, srcObjkey)
if err != nil {
return
}
defer s.lock.RUnlock(srcObjkey)
// Get source object
srcObject, err := s.getObject(srcObjkey)
if err != nil {
return
}
if srcObject == nil {
err = ErrObjectNotFound
return
}
// Desert bucket key
dstBuckey := s.getBucketKey(args.Bucket)
// RLock destination bucket
err = s.lock.RLock(ctx, dstBuckey)
if err != nil {
return
}
defer s.lock.RUnlock(dstBuckey)
// Get destination bucket
dstBucket, err := s.getBucket(dstBuckey)
if err != nil {
return
}
if dstBucket == nil {
err = ErrBucketNotFound
return
}
// Check destination action ACL
dstAllow := s.checkACL(dstBucket.Owner, dstBucket.ACL, args.UserId, action.PutObjectAction)
if !dstAllow {
err = ErrNotAllowed
return
}
// Destination object key
dstObjkey := s.getObjectKey(args.Bucket, args.Object)
// Lock Destination object
err = s.lock.Lock(ctx, dstObjkey)
if err != nil {
return
}
defer s.lock.Unlock(dstObjkey)
// Add body Refer
err = s.addBodyRef(ctx, srcObject.CID, dstObjkey)
if err != nil {
return
}
// Mark if delete the cid ref
deleteRef := true
// If put new object failed, try to delete its reference
defer func() {
if deleteRef {
_ = s.removeBodyRef(ctx, srcObject.CID, dstObjkey)
}
}()
// Old desert object
oldDstObject, err := s.getObject(dstObjkey)
if err != nil {
return
}
// now
now := time.Now().UTC()
// Destination object
dstObject = &Object{
Bucket: args.Bucket,
Name: args.Object,
ModTime: now,
Size: srcObject.Size,
IsDir: false,
ETag: srcObject.ETag,
CID: srcObject.CID,
VersionID: "",
IsLatest: true,
DeleteMarker: false,
ContentType: srcObject.ContentType,
ContentEncoding: srcObject.ContentEncoding,
SuccessorModTime: now,
Expires: args.Expires,
}
// Replace metadata
if args.ReplaceMeta {
dstObject.ContentType = args.ContentType
dstObject.ContentEncoding = args.ContentEncoding
}
// Put destination object
err = s.putObject(dstObjkey, dstObject)
if err != nil {
return
}
// Mark the delete ref to false
deleteRef = false
// Try to remove the old object body
if oldDstObject != nil {
_ = s.removeBody(ctx, oldDstObject.CID, dstObjkey)
}
return
}
// GetObject get a user specified object
func (s *service) GetObject(ctx context.Context, args *GetObjectArgs) (object *Object, body io.ReadCloser, err error) {
// Operation context
ctx, cancel := s.opctx(ctx)
defer cancel()
// Unlock-later is a flag mark if the bucket or object will be unlocked later
// if the flag is true, the bucket and object should not be unlocked as soon as leave the function call
// they will be automatically unlocked after completely written the object body or write object body timeout
unlockLater := false
// bucket key
buckey := s.getBucketKey(args.Bucket)
// RLock bucket
err = s.lock.RLock(ctx, buckey)
if err != nil {
return
}
defer func() {
if !unlockLater {
s.lock.RUnlock(buckey)
}
}()
// Get bucket
bucket, err := s.getBucket(buckey)
if err != nil {
return
}
if bucket == nil {
err = ErrBucketNotFound
return
}
// Check action ACL
allow := s.checkACL(bucket.Owner, bucket.ACL, args.UserId, action.GetObjectAction)
if !allow {
err = ErrNotAllowed
return
}
// Object key
objkey := s.getObjectKey(args.Bucket, args.Object)
// RLock object
err = s.lock.RLock(ctx, objkey)
if err != nil {
return
}
defer func() {
if !unlockLater {
s.lock.RUnlock(objkey)
}
}()
// Get object
object, err = s.getObject(objkey)
if err != nil {
return
}
if object == nil {
err = ErrObjectNotFound
return
}
// no need body
if !args.WithBody {
return
}
// Get object body
body, err = s.providers.FileStore().Cat(object.CID)
if err != nil {
return
}
// Set unlock-later flag to true to enable the bucket and object
// will not be unlocked before completely written the response body
unlockLater = true
// Wrap the body with timeout and unlock hooks,
// this will enable the bucket and object keep rlocked until
// read timout or read closed. Normally, these locks will
// be released as soon as leave from the call
body = WrapCleanReadCloser(body, s.closeBodyTimeout, func() {
s.lock.RUnlock(objkey) // Note: Release object first
s.lock.RUnlock(buckey)
})
return
}
// DeleteObject delete a user specified object
func (s *service) DeleteObject(ctx context.Context, args *DeleteObjectArgs) (err error) {
// Operation context
ctx, cancel := s.opctx(ctx)
defer cancel()
// Bucket key
buckey := s.getBucketKey(args.Bucket)
// RLock bucket
err = s.lock.RLock(ctx, buckey)
if err != nil {
return
}
defer s.lock.RUnlock(buckey)
// Get bucket
bucket, err := s.getBucket(buckey)
if err != nil {
return
}
if bucket == nil {
err = ErrBucketNotFound
return
}
// Check action ACL
allow := s.checkACL(bucket.Owner, bucket.ACL, args.UserId, action.DeleteObjectAction)
if !allow {
err = ErrNotAllowed
return
}
// Object key
objkey := s.getObjectKey(args.Bucket, args.Object)
// Lock object
err = s.lock.Lock(ctx, objkey)
if err != nil {
return
}
defer s.lock.Unlock(objkey)
// Get object
object, err := s.getObject(objkey)
if err != nil {
return
}
if object == nil {
err = ErrObjectNotFound
return
}
// Delete object
err = s.deleteObject(objkey)
if err != nil {
return
}
// Try to delete object body
_ = s.removeBody(ctx, object.CID, objkey)
return
}
// DeleteObjects delete multiple user specified objects
func (s *service) DeleteObjects(ctx context.Context, args *DeleteObjectsArgs) (deletes []*DeletedObject, err error) {
// Operation context
ctx, cancel := s.opctx(ctx)
defer cancel()
// Bucket key
buckey := s.getBucketKey(args.Bucket)
// RLock bucket
err = s.lock.RLock(ctx, buckey)
if err != nil {
return
}
defer s.lock.RUnlock(buckey)
// Get bucket
bucket, err := s.getBucket(buckey)
if err != nil {
return
}
if bucket == nil {
err = ErrBucketNotFound
return
}
// Check action ACL
allow := s.checkACL(bucket.Owner, bucket.ACL, args.UserId, action.DeleteObjectAction)
if !allow {
err = ErrNotAllowed
return
}
for _, deleteObj := range args.ToDeleteObjects {
func(deleteObj *ToDeleteObject) {
var er error
// Collection delete result
defer func() {
if er != nil || !args.Quite {
deletes = append(deletes, &DeletedObject{
Object: deleteObj.Object,
DeleteErr: er,
})
}
}()
// Validate failed
er = deleteObj.ValidateErr
if er != nil {
return
}
// Object key
objkey := s.getObjectKey(args.Bucket, deleteObj.Object)
// Lock object
er = s.lock.Lock(ctx, objkey)
if er != nil {
return
}
defer s.lock.Unlock(objkey)
// Get object
object, er := s.getObject(objkey)
if er != nil {
return
}
if object == nil {
er = ErrObjectNotFound
return
}
// Delete object
er = s.deleteObject(objkey)
if er != nil {
return
}
// Try to delete object body
_ = s.removeBody(ctx, object.CID, objkey)
}(deleteObj)
}
return
}
// ListObjects list user specified objects
func (s *service) ListObjects(ctx context.Context, args *ListObjectsArgs) (list *ObjectsList, err error) {
// Operation context
ctx, cancel := s.opctx(ctx)
defer cancel()
// Object list
list = &ObjectsList{
Args: args,
}
// Bucket key
buckey := s.getBucketKey(args.Bucket)
// RLock bucket
err = s.lock.RLock(ctx, buckey)
if err != nil {
return
}
defer s.lock.RUnlock(buckey)
// Get bucket
bucket, err := s.getBucket(buckey)
if err != nil {
return
}
if bucket == nil {
err = ErrBucketNotFound
return
}
// Check action ACL
allow := s.checkACL(bucket.Owner, bucket.ACL, args.UserId, action.ListObjectsAction)
if !allow {
err = ErrNotAllowed
return
}
// Set objects owner(objects owner is the bucket owner included them)
list.Owner = bucket.Owner
// MaxKeys is zero
if args.MaxKeys == 0 {
list.IsTruncated = true
return
}
// All bucket objects key prefix
allObjectsKeyPrefix := s.getAllObjectsKeyPrefix(args.Bucket)
// List objects key prefix
listObjectsKeyPrefix := allObjectsKeyPrefix + args.Prefix
// Accumulate count
count := int64(0)
// Flag mark if begin collect, it initialized to true if
// marker is ""
begin := args.Marker == ""
// Seen keys, used to group common keys
seen := make(map[string]bool)
// Delimiter length
dl := len(args.Delimiter)
// Prefix length
pl := len(args.Prefix)
// Iterate all objects with the specified prefix to collect and group specified range items
err = s.providers.StateStore().Iterate(listObjectsKeyPrefix, func(key, _ []byte) (stop bool, er error) {
// Object key
objkey := string(key)
// Object name
objname := strings.TrimPrefix(objkey, allObjectsKeyPrefix)
// Common prefix: if the part of object name without prefix include delimiter
// it is the string truncated object name after the delimiter, else
// it is empty string
commonPrefix := ""
if dl > 0 {
di := strings.Index(objname[pl:], args.Delimiter)
if di >= 0 {
commonPrefix = objname[:(pl + di + dl)]
}
}
// If collect not begin, check the marker, if it is matched
// with the common prefix or object name, then begin collection from next iterate
// and if common prefix matched, mark this common prefix as seen
if !begin {
if commonPrefix != "" && args.Marker == commonPrefix {
seen[commonPrefix] = true
begin = true
} else if args.Marker == objname {
begin = true
}
return
}
// ToDeleteObjects with same common prefix will be grouped into one
// note: the objects without common prefix will present only once, so
// it is not necessary to add these objects names in the seen map
// ToDeleteObjects with common prefix grouped int one
if commonPrefix != "" {
if seen[commonPrefix] {
return
}
list.Prefixes = append(list.Prefixes, commonPrefix)
list.NextMarker = commonPrefix
seen[commonPrefix] = true
} else {
// object without common prefix
var object *Object
er = s.providers.StateStore().Get(objkey, &object)
if er != nil {
return
}
list.Objects = append(list.Objects, object)
list.NextMarker = objname
}
// Increment collection count
count++
// Check the count, if it matched the max, means
// the collect is complete, but the items may remain, so stop the
// iteration, and mark the list was truncated
if count == args.MaxKeys {
list.IsTruncated = true
stop = true
}
return
})
return
}
func (s *service) ListObjectsV2(ctx context.Context, args *ListObjectsV2Args) (list *ObjectsListV2, err error) {
// Args v1
v1Args := &ListObjectsArgs{
UserId: args.UserId,
Bucket: args.Bucket,
MaxKeys: args.MaxKeys,
Marker: utils.CoalesceStr(args.Token, args.After),
Prefix: args.Prefix,
Delimiter: args.Delimiter,
EncodingType: args.EncodingType,
}
// Get v1 list
v1List, err := s.ListObjects(ctx, v1Args)
if err != nil {
return
}
// List v2
list = &ObjectsListV2{
Args: args,
Owner: v1List.Owner,
IsTruncated: v1List.IsTruncated,
NextContinuationToken: v1List.NextMarker,
Objects: v1List.Objects,
Prefixes: v1List.Prefixes,
}
return
}
func (s *service) deleteObject(objkey string) (err error) {
err = s.providers.StateStore().Delete(objkey)
return
}
func (s *service) putObject(objkey string, object *Object) (err error) {
err = s.providers.StateStore().Put(objkey, object)
return
}
func (s *service) getObject(objkey string) (object *Object, err error) {
err = s.providers.StateStore().Get(objkey, &object)
if errors.Is(err, providers.ErrStateStoreNotFound) {
err = nil
}
return
}
// GetObjectACL get user specified object ACL(bucket acl)
func (s *service) GetObjectACL(ctx context.Context, args *GetObjectACLArgs) (acl *ACL, err error) {
// Operation context
ctx, cancel := s.opctx(ctx)
defer cancel()
// Bucket key
buckey := s.getBucketKey(args.Bucket)
// RLock bucket
err = s.lock.RLock(ctx, buckey)
if err != nil {
return
}
defer s.lock.RUnlock(buckey)
// Get bucket
bucket, err := s.getBucket(buckey)
if err != nil {
return
}
if bucket == nil {
err = ErrBucketNotFound
return
}
// Check action ACL
allow := s.checkACL(bucket.Owner, bucket.ACL, args.UserId, action.GetBucketAclAction)
if !allow {
err = ErrNotAllowed
return
}
// Object key
objkey := s.getObjectKey(args.Bucket, args.Object)
// RLock object
err = s.lock.RLock(ctx, objkey)
if err != nil {
return
}
defer s.lock.RUnlock(objkey)
// Get object
object, err := s.getObject(objkey)
if err != nil {
return
}
if object == nil {
err = ErrObjectNotFound
}
// ACL
acl = &ACL{
Owner: bucket.Owner,
ACL: bucket.ACL,
}
return
}