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
|
// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/arc/fileapi/file_stream_forwarder.h"
#include <algorithm>
#include <string_view>
#include <utility>
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/net_errors.h"
using content::BrowserThread;
namespace arc {
namespace {
constexpr int kBufSize = 32 * 1024;
} // namespace
FileStreamForwarder::FileStreamForwarder(
scoped_refptr<storage::FileSystemContext> context,
const storage::FileSystemURL& url,
int64_t offset,
int64_t size,
base::ScopedFD fd_dest,
ResultCallback callback)
: context_(context),
url_(url),
offset_(offset),
remaining_size_(size),
fd_dest_(std::move(fd_dest)),
callback_(std::move(callback)),
task_runner_(base::ThreadPool::CreateSequencedTaskRunner(
// It's safe to shutdown without waiting for the
// completion of tasks running with this task runner.
{base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN,
base::MayBlock()})),
buf_(base::MakeRefCounted<net::IOBufferWithSize>(kBufSize)) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
content::GetIOThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&FileStreamForwarder::Start, base::Unretained(this)));
}
void FileStreamForwarder::Destroy() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
content::GetIOThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(&FileStreamForwarder::DestroyOnIOThread,
base::Unretained(this)));
}
FileStreamForwarder::~FileStreamForwarder() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (!callback_.is_null()) // Aborted before completion.
NotifyCompleted(false);
// Use the task runner to close the FD.
task_runner_->PostTask(FROM_HERE,
base::DoNothingWithBoundArgs(std::move(fd_dest_)));
}
void FileStreamForwarder::DestroyOnIOThread() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
delete this;
}
void FileStreamForwarder::Start() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
stream_reader_ = context_->CreateFileStreamReader(
url_, offset_, remaining_size_, base::Time());
if (!stream_reader_) {
LOG(ERROR) << "CreateFileStreamReader failed.";
NotifyCompleted(false);
return;
}
DoRead();
}
void FileStreamForwarder::DoRead() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (remaining_size_ == 0) {
NotifyCompleted(true);
return;
}
const int result = stream_reader_->Read(
buf_.get(), std::min<int64_t>(buf_->size(), remaining_size_),
base::BindOnce(&FileStreamForwarder::OnReadCompleted,
weak_ptr_factory_.GetWeakPtr()));
if (result != net::ERR_IO_PENDING) {
// Read result is returned synchronously.
OnReadCompleted(result);
}
}
void FileStreamForwarder::OnReadCompleted(int result) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (result <= 0) {
if (result == 0) {
LOG(ERROR) << remaining_size_ << " more bytes to read, but reached EOF.";
} else {
LOG(ERROR) << "Read failed " << net::ErrorToString(result);
}
NotifyCompleted(false);
return;
}
remaining_size_ -= result;
DCHECK_GE(remaining_size_, 0);
task_runner_->PostTaskAndReplyWithResult(
FROM_HERE,
base::BindOnce(
[](int fd, scoped_refptr<net::IOBuffer> buf, int size) {
const bool result = base::WriteFileDescriptor(
fd, std::string_view(buf->data(), size));
PLOG_IF(ERROR, !result) << "Write failed.";
return result;
},
fd_dest_.get(), buf_, result),
base::BindOnce(&FileStreamForwarder::OnWriteCompleted,
weak_ptr_factory_.GetWeakPtr()));
}
void FileStreamForwarder::OnWriteCompleted(bool result) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
if (!result) {
NotifyCompleted(false);
return;
}
// Continue reading.
DoRead();
}
void FileStreamForwarder::NotifyCompleted(bool result) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
DCHECK(!callback_.is_null());
content::GetUIThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(std::move(callback_), result));
}
} // namespace arc
|
