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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/390223051): Remove C-library calls to fix the errors.
#pragma allow_unsafe_libc_calls
#endif
#include "device/bluetooth/socket.h"
#include <string>
#include <utility>
#include <vector>
#include "base/containers/span.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/memory/ptr_util.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/string_view_util.h"
#include "device/bluetooth/bluetooth_socket.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/system/data_pipe.h"
#include "net/base/io_buffer.h"
namespace bluetooth {
namespace {
// TODO(b/269348144) - BluetoothSocket is constructed in UI thread and must also
// be destructed in UI thread. We must keep this reference until disconnect
// completes so that the destructor does not run in the socket thread.
void HoldReferenceUntilDisconnected(
scoped_refptr<device::BluetoothSocket> socket,
mojom::Socket::DisconnectCallback callback) {
std::move(callback).Run();
}
} // namespace
Socket::Socket(scoped_refptr<device::BluetoothSocket> bluetooth_socket,
mojo::ScopedDataPipeProducerHandle receive_stream,
mojo::ScopedDataPipeConsumerHandle send_stream)
: bluetooth_socket_(std::move(bluetooth_socket)),
receive_stream_(std::move(receive_stream)),
send_stream_(std::move(send_stream)),
receive_stream_watcher_(FROM_HERE,
mojo::SimpleWatcher::ArmingPolicy::MANUAL),
send_stream_watcher_(FROM_HERE,
mojo::SimpleWatcher::ArmingPolicy::MANUAL) {
receive_stream_watcher_.Watch(
receive_stream_.get(),
MOJO_HANDLE_SIGNAL_WRITABLE | MOJO_HANDLE_SIGNAL_PEER_CLOSED,
base::BindRepeating(&Socket::OnReceiveStreamWritable,
base::Unretained(this)));
send_stream_watcher_.Watch(
send_stream_.get(),
MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_PEER_CLOSED,
base::BindRepeating(&Socket::OnSendStreamReadable,
base::Unretained(this)));
ReceiveMore();
SendMore();
}
Socket::~Socket() {
ShutdownReceive();
ShutdownSend();
bluetooth_socket_->Disconnect(base::BindOnce(
&HoldReferenceUntilDisconnected, bluetooth_socket_, base::DoNothing()));
}
void Socket::Disconnect(DisconnectCallback callback) {
bluetooth_socket_->Disconnect(base::BindOnce(
&HoldReferenceUntilDisconnected, bluetooth_socket_, std::move(callback)));
}
void Socket::OnReceiveStreamWritable(MojoResult result) {
DCHECK(receive_stream_.is_valid());
if (result == MOJO_RESULT_OK) {
ReceiveMore();
return;
}
ShutdownReceive();
}
void Socket::ShutdownReceive() {
receive_stream_watcher_.Cancel();
receive_stream_.reset();
}
void Socket::ReceiveMore() {
DCHECK(receive_stream_.is_valid());
// The destination to which we will write incoming bytes from
// |bluetooth_socket_|. The allocated buffer and its size will be fetched by
// calling BeginWriteData() below. This already-allocated buffer is a buffer
// shared between the 2 sides of |receive_stream_|.
base::span<uint8_t> pending_write_buffer;
MojoResult result = receive_stream_->BeginWriteData(
mojo::DataPipeProducerHandle::kNoSizeHint, MOJO_WRITE_DATA_FLAG_NONE,
pending_write_buffer);
if (result == MOJO_RESULT_SHOULD_WAIT) {
receive_stream_watcher_.ArmOrNotify();
return;
} else if (result != MOJO_RESULT_OK) {
ShutdownReceive();
return;
}
bluetooth_socket_->Receive(
base::checked_cast<int>(pending_write_buffer.size()),
base::BindOnce(&Socket::OnBluetoothSocketReceive,
weak_ptr_factory_.GetWeakPtr(),
pending_write_buffer.data()),
base::BindOnce(&Socket::OnBluetoothSocketReceiveError,
weak_ptr_factory_.GetWeakPtr()));
}
void Socket::OnBluetoothSocketReceive(void* pending_write_buffer,
int num_bytes_received,
scoped_refptr<net::IOBuffer> io_buffer) {
DCHECK_GT(num_bytes_received, 0);
DCHECK(io_buffer->data());
if (!receive_stream_.is_valid())
return;
memcpy(pending_write_buffer, io_buffer->data(), num_bytes_received);
receive_stream_->EndWriteData(static_cast<uint32_t>(num_bytes_received));
ReceiveMore();
}
void Socket::OnBluetoothSocketReceiveError(
device::BluetoothSocket::ErrorReason error_reason,
const std::string& error_message) {
DLOG(ERROR) << "Failed to receive data for reason '" << error_reason << "': '"
<< error_message << "'";
if (receive_stream_.is_valid()) {
receive_stream_->EndWriteData(0);
ShutdownReceive();
}
}
void Socket::OnSendStreamReadable(MojoResult result) {
DCHECK(send_stream_.is_valid());
if (result == MOJO_RESULT_OK)
SendMore();
else
ShutdownSend();
}
void Socket::ShutdownSend() {
send_stream_watcher_.Cancel();
send_stream_.reset();
}
void Socket::SendMore() {
DCHECK(send_stream_.is_valid());
// The source from which we will write outgoing bytes to |bluetooth_socket_|.
// The allocated buffer and the number of bytes already written by the other
// side of |send_stream_| will be fetched by calling BeginReadData() below.
// This already-allocated buffer is a buffer shared between the 2 sides of
// |send_stream_|.
base::span<const uint8_t> pending_read_buffer;
MojoResult result = send_stream_->BeginReadData(MOJO_WRITE_DATA_FLAG_NONE,
pending_read_buffer);
if (result == MOJO_RESULT_SHOULD_WAIT) {
send_stream_watcher_.ArmOrNotify();
return;
} else if (result != MOJO_RESULT_OK) {
ShutdownSend();
return;
}
std::string_view chars = base::as_string_view(pending_read_buffer);
bluetooth_socket_->Send(base::MakeRefCounted<net::WrappedIOBuffer>(chars),
chars.size(),
base::BindOnce(&Socket::OnBluetoothSocketSend,
weak_ptr_factory_.GetWeakPtr()),
base::BindOnce(&Socket::OnBluetoothSocketSendError,
weak_ptr_factory_.GetWeakPtr()));
}
void Socket::OnBluetoothSocketSend(int num_bytes_sent) {
DCHECK_GE(num_bytes_sent, 0);
if (!send_stream_.is_valid())
return;
send_stream_->EndReadData(static_cast<uint32_t>(num_bytes_sent));
SendMore();
}
void Socket::OnBluetoothSocketSendError(const std::string& error_message) {
DLOG(ERROR) << "Failed to send data: '" << error_message << "'";
if (send_stream_.is_valid()) {
send_stream_->EndReadData(0);
ShutdownSend();
}
}
} // namespace bluetooth
|
