mirror of
https://github.com/rclone/rclone.git
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151 lines
4.1 KiB
Go
151 lines
4.1 KiB
Go
// Copyright 2014 Google Inc. All Rights Reserved.
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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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package storage
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import (
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"errors"
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"fmt"
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"io"
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"unicode/utf8"
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"golang.org/x/net/context"
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"google.golang.org/api/googleapi"
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raw "google.golang.org/api/storage/v1"
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)
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// A Writer writes a Cloud Storage object.
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type Writer struct {
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// ObjectAttrs are optional attributes to set on the object. Any attributes
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// must be initialized before the first Write call. Nil or zero-valued
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// attributes are ignored.
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ObjectAttrs
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// ChunkSize controls the maximum number of bytes of the object that the
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// Writer will attempt to send to the server in a single request. Objects
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// smaller than the size will be sent in a single request, while larger
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// objects will be split over multiple requests. The size will be rounded up
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// to the nearest multiple of 256K. If zero, chunking will be disabled and
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// the object will be uploaded in a single request.
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//
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// ChunkSize will default to a reasonable value. Any custom configuration
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// must be done before the first Write call.
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ChunkSize int
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ctx context.Context
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o *ObjectHandle
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opened bool
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pw *io.PipeWriter
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donec chan struct{} // closed after err and obj are set.
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err error
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obj *ObjectAttrs
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}
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func (w *Writer) open() error {
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attrs := w.ObjectAttrs
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// Check the developer didn't change the object Name (this is unfortunate, but
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// we don't want to store an object under the wrong name).
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if attrs.Name != w.o.object {
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return fmt.Errorf("storage: Writer.Name %q does not match object name %q", attrs.Name, w.o.object)
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}
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if !utf8.ValidString(attrs.Name) {
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return fmt.Errorf("storage: object name %q is not valid UTF-8", attrs.Name)
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}
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pr, pw := io.Pipe()
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w.pw = pw
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w.opened = true
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if w.ChunkSize < 0 {
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return errors.New("storage: Writer.ChunkSize must non-negative")
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}
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mediaOpts := []googleapi.MediaOption{
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googleapi.ChunkSize(w.ChunkSize),
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}
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if c := attrs.ContentType; c != "" {
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mediaOpts = append(mediaOpts, googleapi.ContentType(c))
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}
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go func() {
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defer close(w.donec)
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call := w.o.c.raw.Objects.Insert(w.o.bucket, attrs.toRawObject(w.o.bucket)).
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Media(pr, mediaOpts...).
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Projection("full").
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Context(w.ctx)
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if err := setEncryptionHeaders(call.Header(), w.o.encryptionKey, false); err != nil {
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w.err = err
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pr.CloseWithError(w.err)
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return
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}
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var resp *raw.Object
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err := applyConds("NewWriter", w.o.gen, w.o.conds, call)
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if err == nil {
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resp, err = call.Do()
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}
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if err != nil {
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w.err = err
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pr.CloseWithError(w.err)
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return
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}
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w.obj = newObject(resp)
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}()
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return nil
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}
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// Write appends to w. It implements the io.Writer interface.
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func (w *Writer) Write(p []byte) (n int, err error) {
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if w.err != nil {
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return 0, w.err
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}
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if !w.opened {
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if err := w.open(); err != nil {
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return 0, err
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}
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}
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return w.pw.Write(p)
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}
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// Close completes the write operation and flushes any buffered data.
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// If Close doesn't return an error, metadata about the written object
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// can be retrieved by calling Attrs.
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func (w *Writer) Close() error {
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if !w.opened {
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if err := w.open(); err != nil {
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return err
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}
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}
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if err := w.pw.Close(); err != nil {
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return err
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}
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<-w.donec
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return w.err
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}
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// CloseWithError aborts the write operation with the provided error.
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// CloseWithError always returns nil.
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func (w *Writer) CloseWithError(err error) error {
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if !w.opened {
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return nil
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}
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return w.pw.CloseWithError(err)
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}
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// Attrs returns metadata about a successfully-written object.
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// It's only valid to call it after Close returns nil.
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func (w *Writer) Attrs() *ObjectAttrs {
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return w.obj
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}
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