1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/chromeos/drive/fileapi/webkit_file_stream_writer_impl.h"
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "chrome/browser/chromeos/drive/fileapi/fileapi_worker.h"
#include "components/drive/file_system_core_util.h"
#include "content/public/browser/browser_thread.h"
#include "google_apis/drive/task_util.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "storage/browser/fileapi/file_stream_writer.h"
using content::BrowserThread;
namespace drive {
namespace internal {
namespace {
// Creates a writable snapshot file of the |drive_path|.
void CreateWritableSnapshotFile(
const WebkitFileStreamWriterImpl::FileSystemGetter& file_system_getter,
const base::FilePath& drive_path,
const fileapi_internal::CreateWritableSnapshotFileCallback& callback) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
BrowserThread::PostTask(
BrowserThread::UI,
FROM_HERE,
base::Bind(
&fileapi_internal::RunFileSystemCallback,
file_system_getter,
base::Bind(&fileapi_internal::CreateWritableSnapshotFile,
drive_path, google_apis::CreateRelayCallback(callback)),
google_apis::CreateRelayCallback(base::Bind(
callback, base::File::FILE_ERROR_FAILED, base::FilePath(),
base::Closure()))));
}
} // namespace
WebkitFileStreamWriterImpl::WebkitFileStreamWriterImpl(
const FileSystemGetter& file_system_getter,
base::TaskRunner* file_task_runner,
const base::FilePath& file_path,
int64_t offset)
: file_system_getter_(file_system_getter),
file_task_runner_(file_task_runner),
file_path_(file_path),
offset_(offset),
weak_ptr_factory_(this) {}
WebkitFileStreamWriterImpl::~WebkitFileStreamWriterImpl() {
if (local_file_writer_) {
// If the file is opened, close it at destructor.
// It is necessary to close the local file in advance.
local_file_writer_.reset();
DCHECK(!close_callback_on_ui_thread_.is_null());
BrowserThread::PostTask(BrowserThread::UI,
FROM_HERE,
close_callback_on_ui_thread_);
}
}
int WebkitFileStreamWriterImpl::Write(net::IOBuffer* buf,
int buf_len,
const net::CompletionCallback& callback) {
DCHECK(pending_write_callback_.is_null());
DCHECK(pending_cancel_callback_.is_null());
DCHECK(!callback.is_null());
// If the local file is already available, just delegate to it.
if (local_file_writer_)
return local_file_writer_->Write(buf, buf_len, callback);
// The local file is not yet ready. Create the writable snapshot.
if (file_path_.empty())
return net::ERR_FILE_NOT_FOUND;
pending_write_callback_ = callback;
CreateWritableSnapshotFile(
file_system_getter_, file_path_,
base::Bind(
&WebkitFileStreamWriterImpl::WriteAfterCreateWritableSnapshotFile,
weak_ptr_factory_.GetWeakPtr(), make_scoped_refptr(buf), buf_len));
return net::ERR_IO_PENDING;
}
int WebkitFileStreamWriterImpl::Cancel(
const net::CompletionCallback& callback) {
DCHECK(pending_cancel_callback_.is_null());
DCHECK(!callback.is_null());
// If LocalFileWriter is already created, just delegate the cancel to it.
if (local_file_writer_)
return local_file_writer_->Cancel(callback);
// If file open operation is in-flight, wait for its completion and cancel
// further write operation in WriteAfterCreateWritableSnapshotFile.
if (!pending_write_callback_.is_null()) {
// Dismiss pending write callback immediately.
pending_write_callback_.Reset();
pending_cancel_callback_ = callback;
return net::ERR_IO_PENDING;
}
// Write() is not called yet.
return net::ERR_UNEXPECTED;
}
int WebkitFileStreamWriterImpl::Flush(const net::CompletionCallback& callback) {
DCHECK(pending_cancel_callback_.is_null());
DCHECK(!callback.is_null());
// If LocalFileWriter is already created, just delegate to it.
if (local_file_writer_)
return local_file_writer_->Flush(callback);
// There shouldn't be in-flight Write operation.
DCHECK(pending_write_callback_.is_null());
// Here is the case Flush() is called before any Write() invocation.
// Do nothing.
// Synchronization to the remote server is not done until the file is closed.
return net::OK;
}
void WebkitFileStreamWriterImpl::WriteAfterCreateWritableSnapshotFile(
net::IOBuffer* buf,
int buf_len,
base::File::Error open_result,
const base::FilePath& local_path,
const base::Closure& close_callback_on_ui_thread) {
DCHECK(!local_file_writer_);
if (!pending_cancel_callback_.is_null()) {
DCHECK(pending_write_callback_.is_null());
// Cancel() is called during the creation of the snapshot file.
// Don't write to the file.
if (open_result == base::File::FILE_OK) {
// Here the file is internally created. To revert the operation, close
// the file.
DCHECK(!close_callback_on_ui_thread.is_null());
BrowserThread::PostTask(BrowserThread::UI,
FROM_HERE,
close_callback_on_ui_thread);
}
base::ResetAndReturn(&pending_cancel_callback_).Run(net::OK);
return;
}
DCHECK(!pending_write_callback_.is_null());
const net::CompletionCallback callback =
base::ResetAndReturn(&pending_write_callback_);
if (open_result != base::File::FILE_OK) {
DCHECK(close_callback_on_ui_thread.is_null());
callback.Run(
net::FileErrorToNetError(open_result));
return;
}
// Keep |close_callback| to close the file when the stream is destructed.
DCHECK(!close_callback_on_ui_thread.is_null());
close_callback_on_ui_thread_ = close_callback_on_ui_thread;
local_file_writer_.reset(storage::FileStreamWriter::CreateForLocalFile(
file_task_runner_.get(),
local_path,
offset_,
storage::FileStreamWriter::OPEN_EXISTING_FILE));
int result = local_file_writer_->Write(buf, buf_len, callback);
if (result != net::ERR_IO_PENDING)
callback.Run(result);
}
} // namespace internal
} // namespace drive
|
