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// Copyright (c) 2010 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_pool.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "base/string_util.h"
#include "base/time.h"
#include "net/base/net_log.h"
#include "net/base/net_errors.h"
#include "net/socket/client_socket_factory.h"
#include "net/socket/client_socket_handle.h"
#include "net/socket/client_socket_pool_base.h"
#include "net/socket/tcp_client_socket.h"
using base::TimeDelta;
namespace net {
// TCPConnectJobs will time out after this many seconds. Note this is the total
// time, including both host resolution and TCP connect() times.
//
// TODO(eroman): The use of this constant needs to be re-evaluated. The time
// needed for TCPClientSocketXXX::Connect() can be arbitrarily long, since
// the address list may contain many alternatives, and most of those may
// timeout. Even worse, the per-connect timeout threshold varies greatly
// between systems (anywhere from 20 seconds to 190 seconds).
// See comment #12 at http://crbug.com/23364 for specifics.
static const int kTCPConnectJobTimeoutInSeconds = 240; // 4 minutes.
TCPConnectJob::TCPConnectJob(
const std::string& group_name,
const TCPSocketParams& params,
base::TimeDelta timeout_duration,
ClientSocketFactory* client_socket_factory,
HostResolver* host_resolver,
Delegate* delegate,
const BoundNetLog& net_log)
: ConnectJob(group_name, timeout_duration, delegate, net_log),
params_(params),
client_socket_factory_(client_socket_factory),
ALLOW_THIS_IN_INITIALIZER_LIST(
callback_(this,
&TCPConnectJob::OnIOComplete)),
resolver_(host_resolver) {}
TCPConnectJob::~TCPConnectJob() {
// We don't worry about cancelling the host resolution and TCP connect, since
// ~SingleRequestHostResolver and ~ClientSocket will take care of it.
}
LoadState TCPConnectJob::GetLoadState() const {
switch (next_state_) {
case kStateResolveHost:
case kStateResolveHostComplete:
return LOAD_STATE_RESOLVING_HOST;
case kStateTCPConnect:
case kStateTCPConnectComplete:
return LOAD_STATE_CONNECTING;
default:
NOTREACHED();
return LOAD_STATE_IDLE;
}
}
int TCPConnectJob::ConnectInternal() {
next_state_ = kStateResolveHost;
start_time_ = base::TimeTicks::Now();
return DoLoop(OK);
}
void TCPConnectJob::OnIOComplete(int result) {
int rv = DoLoop(result);
if (rv != ERR_IO_PENDING)
NotifyDelegateOfCompletion(rv); // Deletes |this|
}
int TCPConnectJob::DoLoop(int result) {
DCHECK_NE(next_state_, kStateNone);
int rv = result;
do {
State state = next_state_;
next_state_ = kStateNone;
switch (state) {
case kStateResolveHost:
DCHECK_EQ(OK, rv);
rv = DoResolveHost();
break;
case kStateResolveHostComplete:
rv = DoResolveHostComplete(rv);
break;
case kStateTCPConnect:
DCHECK_EQ(OK, rv);
rv = DoTCPConnect();
break;
case kStateTCPConnectComplete:
rv = DoTCPConnectComplete(rv);
break;
default:
NOTREACHED();
rv = ERR_FAILED;
break;
}
} while (rv != ERR_IO_PENDING && next_state_ != kStateNone);
return rv;
}
int TCPConnectJob::DoResolveHost() {
next_state_ = kStateResolveHostComplete;
return resolver_.Resolve(params_.destination(), &addresses_, &callback_,
net_log());
}
int TCPConnectJob::DoResolveHostComplete(int result) {
if (result == OK)
next_state_ = kStateTCPConnect;
return result;
}
int TCPConnectJob::DoTCPConnect() {
next_state_ = kStateTCPConnectComplete;
set_socket(client_socket_factory_->CreateTCPClientSocket(
addresses_, net_log().net_log()));
connect_start_time_ = base::TimeTicks::Now();
return socket()->Connect(&callback_);
}
int TCPConnectJob::DoTCPConnectComplete(int result) {
if (result == OK) {
DCHECK(connect_start_time_ != base::TimeTicks());
DCHECK(start_time_ != base::TimeTicks());
base::TimeTicks now = base::TimeTicks::Now();
base::TimeDelta total_duration = now - start_time_;
UMA_HISTOGRAM_CUSTOM_TIMES(
"Net.DNS_Resolution_And_TCP_Connection_Latency2",
total_duration,
base::TimeDelta::FromMilliseconds(1),
base::TimeDelta::FromMinutes(10),
100);
base::TimeDelta connect_duration = now - connect_start_time_;
UMA_HISTOGRAM_CUSTOM_TIMES("Net.TCP_Connection_Latency",
connect_duration,
base::TimeDelta::FromMilliseconds(1),
base::TimeDelta::FromMinutes(10),
100);
} else {
// Delete the socket on error.
set_socket(NULL);
}
return result;
}
ConnectJob* TCPClientSocketPool::TCPConnectJobFactory::NewConnectJob(
const std::string& group_name,
const PoolBase::Request& request,
ConnectJob::Delegate* delegate,
const BoundNetLog& net_log) const {
return new TCPConnectJob(group_name, request.params(), ConnectionTimeout(),
client_socket_factory_, host_resolver_, delegate,
net_log);
}
base::TimeDelta
TCPClientSocketPool::TCPConnectJobFactory::ConnectionTimeout() const {
return base::TimeDelta::FromSeconds(kTCPConnectJobTimeoutInSeconds);
}
TCPClientSocketPool::TCPClientSocketPool(
int max_sockets,
int max_sockets_per_group,
const std::string& name,
HostResolver* host_resolver,
ClientSocketFactory* client_socket_factory)
: base_(max_sockets, max_sockets_per_group, name,
base::TimeDelta::FromSeconds(kUnusedIdleSocketTimeout),
base::TimeDelta::FromSeconds(kUsedIdleSocketTimeout),
new TCPConnectJobFactory(client_socket_factory, host_resolver)) {
base_.enable_backup_jobs();
}
TCPClientSocketPool::~TCPClientSocketPool() {}
int TCPClientSocketPool::RequestSocket(
const std::string& group_name,
const void* params,
RequestPriority priority,
ClientSocketHandle* handle,
CompletionCallback* callback,
const BoundNetLog& net_log) {
const TCPSocketParams* casted_params =
static_cast<const TCPSocketParams*>(params);
if (net_log.HasListener()) {
// TODO(eroman): Split out the host and port parameters.
net_log.AddEvent(
NetLog::TYPE_TCP_CLIENT_SOCKET_POOL_REQUESTED_SOCKET,
new NetLogStringParameter(
"host_and_port",
StringPrintf("%s [port %d]",
casted_params->destination().hostname().c_str(),
casted_params->destination().port())));
}
return base_.RequestSocket(group_name, *casted_params, priority, handle,
callback, net_log);
}
void TCPClientSocketPool::CancelRequest(
const std::string& group_name,
const ClientSocketHandle* handle) {
base_.CancelRequest(group_name, handle);
}
void TCPClientSocketPool::ReleaseSocket(
const std::string& group_name,
ClientSocket* socket) {
base_.ReleaseSocket(group_name, socket);
}
void TCPClientSocketPool::CloseIdleSockets() {
base_.CloseIdleSockets();
}
int TCPClientSocketPool::IdleSocketCountInGroup(
const std::string& group_name) const {
return base_.IdleSocketCountInGroup(group_name);
}
LoadState TCPClientSocketPool::GetLoadState(
const std::string& group_name, const ClientSocketHandle* handle) const {
return base_.GetLoadState(group_name, handle);
}
} // namespace net
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