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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
|
// Copyright (c) 2013 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 "net/socket/tcp_client_socket.h"
#include "base/callback_helpers.h"
#include "base/logging.h"
#include "base/metrics/histogram_macros.h"
#include "base/profiler/scoped_tracker.h"
#include "base/time/time.h"
#include "net/base/io_buffer.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_errors.h"
#include "net/base/net_util.h"
namespace net {
TCPClientSocket::TCPClientSocket(const AddressList& addresses,
net::NetLog* net_log,
const net::NetLog::Source& source)
: socket_(new TCPSocket(net_log, source)),
addresses_(addresses),
current_address_index_(-1),
next_connect_state_(CONNECT_STATE_NONE),
previously_disconnected_(false),
total_received_bytes_(0) {}
TCPClientSocket::TCPClientSocket(scoped_ptr<TCPSocket> connected_socket,
const IPEndPoint& peer_address)
: socket_(connected_socket.Pass()),
addresses_(AddressList(peer_address)),
current_address_index_(0),
next_connect_state_(CONNECT_STATE_NONE),
previously_disconnected_(false),
total_received_bytes_(0) {
DCHECK(socket_);
socket_->SetDefaultOptionsForClient();
use_history_.set_was_ever_connected();
}
TCPClientSocket::~TCPClientSocket() {
Disconnect();
}
int TCPClientSocket::Bind(const IPEndPoint& address) {
if (current_address_index_ >= 0 || bind_address_) {
// Cannot bind the socket if we are already connected or connecting.
NOTREACHED();
return ERR_UNEXPECTED;
}
int result = OK;
if (!socket_->IsValid()) {
result = OpenSocket(address.GetFamily());
if (result != OK)
return result;
}
result = socket_->Bind(address);
if (result != OK)
return result;
bind_address_.reset(new IPEndPoint(address));
return OK;
}
int TCPClientSocket::Connect(const CompletionCallback& callback) {
DCHECK(!callback.is_null());
// If connecting or already connected, then just return OK.
if (socket_->IsValid() && current_address_index_ >= 0)
return OK;
socket_->StartLoggingMultipleConnectAttempts(addresses_);
// We will try to connect to each address in addresses_. Start with the
// first one in the list.
next_connect_state_ = CONNECT_STATE_CONNECT;
current_address_index_ = 0;
int rv = DoConnectLoop(OK);
if (rv == ERR_IO_PENDING) {
connect_callback_ = callback;
} else {
socket_->EndLoggingMultipleConnectAttempts(rv);
}
return rv;
}
int TCPClientSocket::DoConnectLoop(int result) {
DCHECK_NE(next_connect_state_, CONNECT_STATE_NONE);
int rv = result;
do {
ConnectState state = next_connect_state_;
next_connect_state_ = CONNECT_STATE_NONE;
switch (state) {
case CONNECT_STATE_CONNECT:
DCHECK_EQ(OK, rv);
rv = DoConnect();
break;
case CONNECT_STATE_CONNECT_COMPLETE:
rv = DoConnectComplete(rv);
break;
default:
NOTREACHED() << "bad state " << state;
rv = ERR_UNEXPECTED;
break;
}
} while (rv != ERR_IO_PENDING && next_connect_state_ != CONNECT_STATE_NONE);
return rv;
}
int TCPClientSocket::DoConnect() {
DCHECK_GE(current_address_index_, 0);
DCHECK_LT(current_address_index_, static_cast<int>(addresses_.size()));
const IPEndPoint& endpoint = addresses_[current_address_index_];
{
// TODO(ricea): Remove ScopedTracker below once crbug.com/436634 is fixed.
tracked_objects::ScopedTracker tracking_profile(
FROM_HERE_WITH_EXPLICIT_FUNCTION("436634 TCPClientSocket::DoConnect"));
if (previously_disconnected_) {
use_history_.Reset();
connection_attempts_.clear();
previously_disconnected_ = false;
}
next_connect_state_ = CONNECT_STATE_CONNECT_COMPLETE;
if (socket_->IsValid()) {
DCHECK(bind_address_);
} else {
int result = OpenSocket(endpoint.GetFamily());
if (result != OK)
return result;
if (bind_address_) {
result = socket_->Bind(*bind_address_);
if (result != OK) {
socket_->Close();
return result;
}
}
}
}
// |socket_| is owned by this class and the callback won't be run once
// |socket_| is gone. Therefore, it is safe to use base::Unretained() here.
return socket_->Connect(endpoint,
base::Bind(&TCPClientSocket::DidCompleteConnect,
base::Unretained(this)));
}
int TCPClientSocket::DoConnectComplete(int result) {
if (result == OK) {
use_history_.set_was_ever_connected();
return OK; // Done!
}
connection_attempts_.push_back(
ConnectionAttempt(addresses_[current_address_index_], result));
// Close whatever partially connected socket we currently have.
DoDisconnect();
// Try to fall back to the next address in the list.
if (current_address_index_ + 1 < static_cast<int>(addresses_.size())) {
next_connect_state_ = CONNECT_STATE_CONNECT;
++current_address_index_;
return OK;
}
// Otherwise there is nothing to fall back to, so give up.
return result;
}
void TCPClientSocket::Disconnect() {
DoDisconnect();
current_address_index_ = -1;
bind_address_.reset();
}
void TCPClientSocket::DoDisconnect() {
total_received_bytes_ = 0;
EmitTCPMetricsHistogramsOnDisconnect();
// If connecting or already connected, record that the socket has been
// disconnected.
previously_disconnected_ = socket_->IsValid() && current_address_index_ >= 0;
socket_->Close();
}
bool TCPClientSocket::IsConnected() const {
return socket_->IsConnected();
}
bool TCPClientSocket::IsConnectedAndIdle() const {
return socket_->IsConnectedAndIdle();
}
int TCPClientSocket::GetPeerAddress(IPEndPoint* address) const {
return socket_->GetPeerAddress(address);
}
int TCPClientSocket::GetLocalAddress(IPEndPoint* address) const {
DCHECK(address);
if (!socket_->IsValid()) {
if (bind_address_) {
*address = *bind_address_;
return OK;
}
return ERR_SOCKET_NOT_CONNECTED;
}
return socket_->GetLocalAddress(address);
}
const BoundNetLog& TCPClientSocket::NetLog() const {
return socket_->net_log();
}
void TCPClientSocket::SetSubresourceSpeculation() {
use_history_.set_subresource_speculation();
}
void TCPClientSocket::SetOmniboxSpeculation() {
use_history_.set_omnibox_speculation();
}
bool TCPClientSocket::WasEverUsed() const {
return use_history_.was_used_to_convey_data();
}
bool TCPClientSocket::UsingTCPFastOpen() const {
return socket_->UsingTCPFastOpen();
}
void TCPClientSocket::EnableTCPFastOpenIfSupported() {
socket_->EnableTCPFastOpenIfSupported();
}
bool TCPClientSocket::WasNpnNegotiated() const {
return false;
}
NextProto TCPClientSocket::GetNegotiatedProtocol() const {
return kProtoUnknown;
}
bool TCPClientSocket::GetSSLInfo(SSLInfo* ssl_info) {
return false;
}
int TCPClientSocket::Read(IOBuffer* buf,
int buf_len,
const CompletionCallback& callback) {
DCHECK(!callback.is_null());
// |socket_| is owned by this class and the callback won't be run once
// |socket_| is gone. Therefore, it is safe to use base::Unretained() here.
CompletionCallback read_callback = base::Bind(
&TCPClientSocket::DidCompleteRead, base::Unretained(this), callback);
int result = socket_->Read(buf, buf_len, read_callback);
if (result > 0) {
use_history_.set_was_used_to_convey_data();
total_received_bytes_ += result;
}
return result;
}
int TCPClientSocket::Write(IOBuffer* buf,
int buf_len,
const CompletionCallback& callback) {
DCHECK(!callback.is_null());
// |socket_| is owned by this class and the callback won't be run once
// |socket_| is gone. Therefore, it is safe to use base::Unretained() here.
CompletionCallback write_callback = base::Bind(
&TCPClientSocket::DidCompleteWrite, base::Unretained(this), callback);
int result = socket_->Write(buf, buf_len, write_callback);
if (result > 0)
use_history_.set_was_used_to_convey_data();
return result;
}
int TCPClientSocket::SetReceiveBufferSize(int32_t size) {
return socket_->SetReceiveBufferSize(size);
}
int TCPClientSocket::SetSendBufferSize(int32_t size) {
return socket_->SetSendBufferSize(size);
}
bool TCPClientSocket::SetKeepAlive(bool enable, int delay) {
return socket_->SetKeepAlive(enable, delay);
}
bool TCPClientSocket::SetNoDelay(bool no_delay) {
return socket_->SetNoDelay(no_delay);
}
void TCPClientSocket::GetConnectionAttempts(ConnectionAttempts* out) const {
*out = connection_attempts_;
}
void TCPClientSocket::ClearConnectionAttempts() {
connection_attempts_.clear();
}
void TCPClientSocket::AddConnectionAttempts(
const ConnectionAttempts& attempts) {
connection_attempts_.insert(connection_attempts_.begin(), attempts.begin(),
attempts.end());
}
int64_t TCPClientSocket::GetTotalReceivedBytes() const {
return total_received_bytes_;
}
void TCPClientSocket::DidCompleteConnect(int result) {
DCHECK_EQ(next_connect_state_, CONNECT_STATE_CONNECT_COMPLETE);
DCHECK_NE(result, ERR_IO_PENDING);
DCHECK(!connect_callback_.is_null());
result = DoConnectLoop(result);
if (result != ERR_IO_PENDING) {
socket_->EndLoggingMultipleConnectAttempts(result);
base::ResetAndReturn(&connect_callback_).Run(result);
}
}
void TCPClientSocket::DidCompleteRead(const CompletionCallback& callback,
int result) {
if (result > 0)
total_received_bytes_ += result;
DidCompleteReadWrite(callback, result);
}
void TCPClientSocket::DidCompleteWrite(const CompletionCallback& callback,
int result) {
DidCompleteReadWrite(callback, result);
}
void TCPClientSocket::DidCompleteReadWrite(const CompletionCallback& callback,
int result) {
if (result > 0)
use_history_.set_was_used_to_convey_data();
// TODO(pkasting): Remove ScopedTracker below once crbug.com/462780 is fixed.
tracked_objects::ScopedTracker tracking_profile(
FROM_HERE_WITH_EXPLICIT_FUNCTION(
"462780 TCPClientSocket::DidCompleteReadWrite"));
callback.Run(result);
}
int TCPClientSocket::OpenSocket(AddressFamily family) {
DCHECK(!socket_->IsValid());
int result = socket_->Open(family);
if (result != OK)
return result;
socket_->SetDefaultOptionsForClient();
return OK;
}
void TCPClientSocket::EmitTCPMetricsHistogramsOnDisconnect() {
base::TimeDelta rtt;
if (socket_->GetEstimatedRoundTripTime(&rtt)) {
UMA_HISTOGRAM_CUSTOM_TIMES("Net.TcpRtt.AtDisconnect", rtt,
base::TimeDelta::FromMilliseconds(1),
base::TimeDelta::FromMinutes(10), 100);
}
}
} // namespace net
|