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bucket.go
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bucket.go
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package s3mem
import (
"bytes"
"io"
"time"
"github.com/alist-org/gofakes3"
"github.com/alist-org/gofakes3/internal/s3io"
"github.com/ryszard/goskiplist/skiplist"
)
type versionGenFunc func() gofakes3.VersionID
type bucket struct {
name string
versioning gofakes3.VersioningStatus
versionGen versionGenFunc
creationDate gofakes3.ContentTime
objects *skiplist.SkipList
}
func newBucket(name string, at time.Time, versionGen versionGenFunc) *bucket {
return &bucket{
name: name,
creationDate: gofakes3.NewContentTime(at),
versionGen: versionGen,
objects: skiplist.NewStringMap(),
}
}
type bucketObject struct {
name string
data *bucketData
versions *skiplist.SkipList
}
func (b *bucketObject) Iterator() *bucketObjectIterator {
var iter skiplist.Iterator
if b.versions != nil {
iter = b.versions.Iterator()
}
return &bucketObjectIterator{
data: b.data,
iter: iter,
}
}
type bucketObjectIterator struct {
data *bucketData
iter skiplist.Iterator
cur *bucketData
done bool
}
func (b *bucketObjectIterator) Seek(key gofakes3.VersionID) bool {
if b.iter.Seek(key) {
return true
}
b.iter = nil
if b.data != nil && b.data.versionID == key {
return true
}
b.data = nil
b.done = true
return false
}
func (b *bucketObjectIterator) Next() bool {
if b.done {
return false
}
if b.iter != nil {
iterAlive := b.iter.Next()
if iterAlive {
b.cur = b.iter.Value().(*bucketData)
return true
}
b.iter.Close()
b.iter = nil
}
if b.data != nil {
b.cur = b.data
b.data = nil
return true
}
b.done = true
return false
}
func (b *bucketObjectIterator) Close() {
if b.iter != nil {
b.iter.Close()
}
b.done = true
}
func (b *bucketObjectIterator) Value() *bucketData {
return b.cur
}
type bucketData struct {
name string
lastModified time.Time
versionID gofakes3.VersionID
deleteMarker bool
body []byte
hash []byte
etag string
metadata map[string]string
}
func (bi *bucketData) toObject(rangeRequest *gofakes3.ObjectRangeRequest, withBody bool) (obj *gofakes3.Object, err error) {
sz := int64(len(bi.body))
data := bi.body
var contents io.ReadCloser
var rnge *gofakes3.ObjectRange
if withBody {
// In case of a range request the correct part of the slice is extracted:
rnge, err = rangeRequest.Range(sz)
if err != nil {
return nil, err
}
if rnge != nil {
data = data[rnge.Start : rnge.Start+rnge.Length]
}
// The data slice should be completely replaced if the bucket item is edited, so
// it should be safe to return the data slice directly.
contents = s3io.ReaderWithDummyCloser{Reader: bytes.NewReader(data)}
} else {
contents = s3io.NoOpReadCloser{}
}
return &gofakes3.Object{
Name: bi.name,
Hash: bi.hash,
Metadata: bi.metadata,
Size: sz,
Range: rnge,
IsDeleteMarker: bi.deleteMarker,
VersionID: bi.versionID,
Contents: contents,
}, nil
}
func (b *bucket) setVersioning(enabled bool) {
if enabled {
b.versioning = gofakes3.VersioningEnabled
} else if b.versioning == gofakes3.VersioningEnabled {
b.versioning = gofakes3.VersioningSuspended
}
}
func (b *bucket) object(objectName string) (obj *bucketObject) {
objIface, _ := b.objects.Get(objectName)
if objIface == nil {
return nil
}
obj, _ = objIface.(*bucketObject)
return obj
}
func (b *bucket) objectVersion(objectName string, versionID gofakes3.VersionID) (*bucketData, error) {
obj := b.object(objectName)
if obj == nil {
return nil, gofakes3.KeyNotFound(objectName)
}
if obj.data != nil && obj.data.versionID == versionID {
return obj.data, nil
}
if obj.versions == nil {
return nil, gofakes3.ErrNoSuchVersion
}
versionIface, _ := obj.versions.Get(versionID)
if versionIface == nil {
return nil, gofakes3.ErrNoSuchVersion
}
return versionIface.(*bucketData), nil
}
func (b *bucket) put(name string, item *bucketData) {
// Always generate a version for convenience; we can just mask it on return.
item.versionID = b.versionGen()
object := b.object(name)
if object == nil {
object = &bucketObject{name: name}
b.objects.Set(name, object)
}
if b.versioning == gofakes3.VersioningEnabled {
if object.data != nil {
if object.versions == nil {
object.versions = skiplist.NewCustomMap(func(l, r interface{}) bool {
return l.(gofakes3.VersionID) < r.(gofakes3.VersionID)
})
}
object.versions.Set(object.data.versionID, object.data)
}
}
object.data = item
}
func (b *bucket) rm(name string, at time.Time) (result gofakes3.ObjectDeleteResult, rerr error) {
object := b.object(name)
if object == nil {
// S3 does not report an error when attemping to delete a key that does not exist
return result, nil
}
if b.versioning == gofakes3.VersioningEnabled {
item := &bucketData{lastModified: at, name: name, deleteMarker: true}
b.put(name, item)
result.IsDeleteMarker = true
result.VersionID = item.versionID
} else {
object.data = nil
if object.versions == nil || object.versions.Len() == 0 {
b.objects.Delete(name)
}
}
return result, nil
}
func (b *bucket) rmVersion(name string, versionID gofakes3.VersionID, at time.Time) (result gofakes3.ObjectDeleteResult, rerr error) {
object := b.object(name)
if object == nil {
return result, nil
} else if object.data != nil && object.data.versionID == versionID {
result.VersionID = versionID
result.IsDeleteMarker = object.data.deleteMarker
object.data = nil
} else if object.versions != nil {
versionIface, ok := object.versions.Delete(versionID)
if !ok {
// S3 does not report an error when attemping to delete a key that does not exist
return result, nil
}
version := versionIface.(*bucketData)
result.VersionID = version.versionID
result.IsDeleteMarker = version.deleteMarker
}
if object.data == nil && (object.versions == nil || object.versions.Len() == 0) {
b.objects.Delete(name)
}
return result, nil
}