storj/cmd/uplinkng/ulfs/remote.go

158 lines
4.4 KiB
Go

// Copyright (C) 2021 Storj Labs, Inc.
// See LICENSE for copying information.
package ulfs
import (
"context"
"strings"
"github.com/zeebo/errs"
"storj.io/storj/cmd/uplinkng/ulloc"
"storj.io/uplink"
)
// Remote implements something close to a filesystem but backed by an uplink project.
type Remote struct {
project *uplink.Project
}
// NewRemote returns something close to a filesystem and returns objects using the project.
func NewRemote(project *uplink.Project) *Remote {
return &Remote{
project: project,
}
}
// Close releases any resources that the Remote contains.
func (r *Remote) Close() error {
return r.project.Close()
}
// Open returns a ReadHandle for the object identified by a given bucket and key.
func (r *Remote) Open(ctx context.Context, bucket, key string) (ReadHandle, error) {
fh, err := r.project.DownloadObject(ctx, bucket, key, nil)
if err != nil {
return nil, errs.Wrap(err)
}
return newUplinkReadHandle(bucket, fh), nil
}
// Create returns a WriteHandle for the object identified by a given bucket and key.
func (r *Remote) Create(ctx context.Context, bucket, key string) (WriteHandle, error) {
fh, err := r.project.UploadObject(ctx, bucket, key, nil)
if err != nil {
return nil, errs.Wrap(err)
}
return newUplinkWriteHandle(fh), nil
}
// Remove deletes the object at the provided key and bucket.
func (r *Remote) Remove(ctx context.Context, bucket, key string, opts *RemoveOptions) error {
if !opts.isPending() {
_, err := r.project.DeleteObject(ctx, bucket, key)
if err != nil {
return errs.Wrap(err)
}
return nil
}
// TODO: we may need a dedicated endpoint for deleting pending object streams
list := r.project.ListUploads(ctx, bucket, &uplink.ListUploadsOptions{Prefix: key})
// TODO: modify when we can have several pending objects for the same object key
if list.Next() {
err := r.project.AbortUpload(ctx, bucket, key, list.Item().UploadID)
if err != nil {
return errs.Wrap(err)
}
}
if err := list.Err(); err != nil {
return errs.Wrap(err)
}
return nil
}
// List lists all of the objects in some bucket that begin with the given prefix.
func (r *Remote) List(ctx context.Context, bucket, prefix string, opts *ListOptions) ObjectIterator {
parentPrefix := ""
if idx := strings.LastIndexByte(prefix, '/'); idx >= 0 {
parentPrefix = prefix[:idx+1]
}
trim := ulloc.NewRemote(bucket, "")
if !opts.isRecursive() {
trim = ulloc.NewRemote(bucket, parentPrefix)
}
var iter ObjectIterator
if opts.isPending() {
iter = newUplinkUploadIterator(
bucket,
r.project.ListUploads(ctx, bucket, &uplink.ListUploadsOptions{
Prefix: parentPrefix,
Recursive: opts.Recursive,
System: true,
Custom: opts.Expanded,
}),
)
} else {
iter = newUplinkObjectIterator(
bucket,
r.project.ListObjects(ctx, bucket, &uplink.ListObjectsOptions{
Prefix: parentPrefix,
Recursive: opts.Recursive,
System: true,
Custom: opts.Expanded,
}),
)
}
return &filteredObjectIterator{
trim: trim,
filter: ulloc.NewRemote(bucket, prefix),
iter: iter,
}
}
// uplinkObjectIterator implements objectIterator for *uplink.ObjectIterator.
type uplinkObjectIterator struct {
bucket string
iter *uplink.ObjectIterator
}
// newUplinkObjectIterator constructs an *uplinkObjectIterator from an *uplink.ObjectIterator.
func newUplinkObjectIterator(bucket string, iter *uplink.ObjectIterator) *uplinkObjectIterator {
return &uplinkObjectIterator{
bucket: bucket,
iter: iter,
}
}
func (u *uplinkObjectIterator) Next() bool { return u.iter.Next() }
func (u *uplinkObjectIterator) Err() error { return u.iter.Err() }
func (u *uplinkObjectIterator) Item() ObjectInfo {
return uplinkObjectToObjectInfo(u.bucket, u.iter.Item())
}
// uplinkUploadIterator implements objectIterator for *multipart.UploadIterators.
type uplinkUploadIterator struct {
bucket string
iter *uplink.UploadIterator
}
// newUplinkUploadIterator constructs a *uplinkUploadIterator from a *uplink.UploadIterator.
func newUplinkUploadIterator(bucket string, iter *uplink.UploadIterator) *uplinkUploadIterator {
return &uplinkUploadIterator{
bucket: bucket,
iter: iter,
}
}
func (u *uplinkUploadIterator) Next() bool { return u.iter.Next() }
func (u *uplinkUploadIterator) Err() error { return u.iter.Err() }
func (u *uplinkUploadIterator) Item() ObjectInfo {
return uplinkUploadInfoToObjectInfo(u.bucket, u.iter.Item())
}