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complexconnect.cc
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// Tencent is pleased to support the open source community by making Mars available.
// Copyright (C) 2016 THL A29 Limited, a Tencent company. All rights reserved.
// Licensed under the MIT License (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// http://opensource.org/licenses/MIT
// Unless required by applicable law or agreed to in writing, software distributed under the License is
// distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
// either express or implied. See the License for the specific language governing permissions and
// limitations under the License.
/*
* ComplexConnect.cpp
*
* Created on: 2014-2-24
* Author: yerungui
*/
#include "complexconnect.h"
#ifndef _WIN32
#define __STDC_FORMAT_MACROS
#include <inttypes.h>
#endif
#include <algorithm>
#include "comm/xlogger/xlogger.h"
#include "comm/socket/socketselect.h"
#include "comm/socket/tcpclient_fsm.h"
#include "comm/socket/socket_address.h"
#include "comm/http.h"
#include "comm/comm_data.h"
#include "comm/time_utils.h"
#include "comm/crypt/ibase64.h"
#include "comm/platform_comm.h"
#ifdef COMPLEX_CONNECT_NAMESPACE
namespace COMPLEX_CONNECT_NAMESPACE {
#endif
ComplexConnect::ComplexConnect(unsigned int _timeout, unsigned int _interval)
: timeout_(_timeout), interval_(_interval), error_interval_(_interval), max_connect_(3), trycount_(0), index_(-1), errcode_(0)
, index_conn_rtt_(0), index_conn_totalcost_(0), totalcost_(0)
{}
ComplexConnect::ComplexConnect(unsigned int _timeout /*ms*/, unsigned int _interval /*ms*/, unsigned int _error_interval /*ms*/, unsigned int _max_connect)
: timeout_(_timeout), interval_(_interval), error_interval_(_error_interval), max_connect_(_max_connect), trycount_(0), index_(-1), errcode_(0)
, index_conn_rtt_(0), index_conn_totalcost_(0), totalcost_(0)
{}
ComplexConnect::~ComplexConnect()
{}
int ComplexConnect::__ConnectTime(unsigned int _index) const {
return _index * interval_;
}
int ComplexConnect::__ConnectTimeout(unsigned int _index) const {
return __ConnectTime(_index) + timeout_;
}
namespace {
class ConnectCheckFSM : public TcpClientFSM {
public:
enum TCheckStatus {
ECheckInit,
EConnProxySucc,
EProxyHttpTunelConnSvrReq,
EProxySocks5GreetReq,
EProxySocks5GreetSucc,
EProxySocks5AuthReq,
EProxySocks5AuthSucc,
EProxySocks5ConnSvrReq,
EProxyConnSvrSucc,
ECheckOK,
ECheckFail,
};
ConnectCheckFSM(const socket_address& _addr, unsigned int _connect_timeout, unsigned int _index, MComplexConnect* _observer)
: TcpClientFSM(_addr.address()), connect_timeout_(_connect_timeout), index_(_index), observer_(_observer), checkfintime_(0) {
check_status_ = (_observer && _observer->OnShouldVerify(_index, addr_)) ? ECheckInit : ECheckOK;
}
TCheckStatus CheckStatus() const { return check_status_;}
int TotalRtt() const { return int(checkfintime_ - start_connecttime_);}
protected:
virtual void _OnCreate() { if (observer_) observer_->OnCreated(index_, addr_, sock_);}
virtual void _OnConnect() { if (observer_) observer_->OnConnect(index_, addr_, sock_);}
virtual void _OnConnected(int _rtt) {
checkfintime_ = ::gettickcount();
if (!observer_) return;
observer_->OnConnected(index_, addr_, sock_, 0, _rtt);
if (ECheckOK == CheckStatus()) {
return;
}
if (!observer_->OnVerifySend(index_, addr_, sock_, send_buf_)) {
check_status_ = ECheckFail;
}
}
virtual void _OnRecv(AutoBuffer& _recv_buff, ssize_t _recv_len) {
if (!observer_) return;
if (ECheckOK == CheckStatus()) return;
check_status_ = observer_->OnVerifyRecv(index_, addr_, sock_, recv_buf_) ? ECheckOK : ECheckFail;
checkfintime_ = gettickcount();
}
virtual void _OnSend(AutoBuffer& _send_buff, ssize_t _send_len) {}
virtual void _OnClose(TSocketStatus _status, int _error, bool _userclose) {
checkfintime_ = gettickcount();
if (observer_ && !_userclose) {
if (EConnecting == _status) {
observer_->OnConnected(index_, addr_, sock_, _error, TotalRtt());
} else if (EReadWrite == _status && SOCKET_ERRNO(ETIMEDOUT) == _error) {
checkfintime_ = gettickcount();
observer_->OnVerifyTimeout((int)(checkfintime_ - end_connecttime_));
}
}
}
virtual int ConnectTimeout() const {return (int)(start_connecttime_ + ConnectAbsTimeout() - gettickcount());}
virtual int ReadWriteTimeout() const {return (int)(end_connecttime_ + ReadWriteAbsTimeout() - gettickcount());}
virtual int ConnectAbsTimeout() const { return connect_timeout_; }
virtual int ReadWriteAbsTimeout() const { return std::max(1000, std::min(6 * Rtt(), ConnectAbsTimeout() - Rtt()));}
protected:
const unsigned int connect_timeout_;
const unsigned int index_;
MComplexConnect* observer_;
TCheckStatus check_status_;
uint64_t checkfintime_;
};
class ConnectHttpTunelCheckFSM : public ConnectCheckFSM {
public:
ConnectHttpTunelCheckFSM(const socket_address& _destaddr, const socket_address& _proxy_addr, const std::string& _proxy_username,
const std::string& _proxy_pwd, unsigned int _connect_timeout, unsigned int _index, MComplexConnect* _observer)
: ConnectCheckFSM(_proxy_addr, _connect_timeout,_index,_observer), destaddr_(_destaddr), username_(_proxy_username), password_(_proxy_pwd){
check_status_ = ECheckInit;
xinfo2(TSF"http tunel proxy info:%_:%_ username:%_", _proxy_addr.ip(), _proxy_addr.port(), username_);
}
protected:
virtual void _OnConnected(int _rtt) {
checkfintime_ = ::gettickcount();
if (observer_) {
observer_->OnConnected(index_, addr_, sock_, 0, _rtt);
}
if (ECheckOK == CheckStatus()) {
return;
}
request_send_ = true;
check_status_ = EConnProxySucc;
}
virtual void _OnRecv(AutoBuffer& _recv_buff, ssize_t _recv_len) {
if (ECheckOK == CheckStatus()) return;
if (check_status_ == EProxyHttpTunelConnSvrReq) {
http::Parser parser;
http::Parser::TRecvStatus parse_status = parser.Recv(_recv_buff.Ptr(), _recv_buff.Length());
if (parse_status != http::Parser::kEnd) {
xinfo2(TSF"proxy response continue:%_", _recv_buff.Length());
return;
}
if (200 == parser.Status().StatusCode()) {
check_status_ = (observer_ && observer_->OnShouldVerify(index_, addr_)) ? EProxyConnSvrSucc : ECheckOK;
request_send_ = true;
checkfintime_ = gettickcount();
_recv_buff.Reset();
} else {
xwarn2(TSF"proxy error, proxy status code:%_, proxy info:%_:%_ resp:%_", parser.Status().StatusCode(), addr_.ip(), addr_.port(), xdump(_recv_buff.Ptr(), _recv_buff.Length()));
check_status_ = ECheckFail;
}
} else if (check_status_ == EProxyConnSvrSucc) {
check_status_ = (observer_ && observer_->OnVerifyRecv(index_, destaddr_, sock_, _recv_buff)) ? ECheckOK : ECheckFail;
checkfintime_ = gettickcount();
} else {
xassert2(false, "status:%d", check_status_);
}
}
virtual void _OnRequestSend(AutoBuffer& _send_buff){
if (check_status_ == EConnProxySucc) {
char ip_port[64] = {0};
snprintf(ip_port, sizeof(ip_port), "%s:%" PRIu16, destaddr_.ip(), destaddr_.port());
http::Builder req_builder(http::kRequest);
req_builder.Request().Method(http::RequestLine::kConnect);
req_builder.Request().Url(ip_port);
req_builder.Request().Version(http::kVersion_1_1);
req_builder.Fields().HeaderFiled(http::HeaderFields::KStringHost, ip_port);
req_builder.Fields().HeaderFiled(http::HeaderFields::kStringProxyConnection, "keep-alive");
req_builder.Fields().HeaderFiled(http::HeaderFields::KStringUserAgent, http::HeaderFields::KStringMicroMessenger);
if (!username_.empty() && !password_.empty()) {
std::string account_info = username_ + ":" + password_;
size_t dstlen = modp_b64_encode_len(account_info.length());
char* dstbuf = (char*)malloc(dstlen);
memset(dstbuf, 0, dstlen);
int retsize = Comm::EncodeBase64((unsigned char*)account_info.c_str(), (unsigned char*)dstbuf, (int)account_info.length());
dstbuf[retsize] = '\0';
char auth_info[1024] = {0};
snprintf(auth_info, sizeof(auth_info), "Basic %s", dstbuf);
req_builder.Fields().HeaderFiled(http::HeaderFields::kStringProxyAuthorization, auth_info);
}
req_builder.HeaderToBuffer(_send_buff);
check_status_ = EProxyHttpTunelConnSvrReq;
} else if (check_status_ == EProxyConnSvrSucc) {
_send_buff.Length(0, 0);
bool verifySucc = observer_->OnVerifySend(index_, destaddr_, sock_, _send_buff);
if (!verifySucc) {
check_status_ = ECheckFail;
}
} else {
xassert2(false, "status:%d", check_status_);
}
}
protected:
const socket_address& destaddr_;
std::string username_;
std::string password_;
};
class ConnectSocks5CheckFSM : public ConnectCheckFSM {
public:
ConnectSocks5CheckFSM(const socket_address& _destaddr, const socket_address& _proxy_addr, const std::string& _proxy_username,
const std::string& _proxy_pwd, unsigned int _connect_timeout, unsigned int _index, MComplexConnect* _observer)
: ConnectCheckFSM(_proxy_addr, _connect_timeout,_index,_observer), destaddr_(_destaddr), username_(_proxy_username), password_(_proxy_pwd){
check_status_ = ECheckInit;
xinfo2(TSF"socks5 proxy info:%_:%_ username:%_", _proxy_addr.ip(), _proxy_addr.port(), username_);
}
protected:
virtual void _OnConnected(int _rtt) {
checkfintime_ = ::gettickcount();
if (observer_) {
observer_->OnConnected(index_, addr_, sock_, 0, _rtt);
}
if (ECheckOK == CheckStatus()) {
return;
}
request_send_ = true;
check_status_ = EConnProxySucc;
}
virtual void _OnRecv(AutoBuffer& _recv_buff, ssize_t _recv_len) {
if (ECheckOK == CheckStatus()) return;
if (check_status_ == EProxySocks5GreetReq) {
if (_recv_buff.Length() < 2) {
xinfo2(TSF"proxy response continue:%_", _recv_buff.Length());
return;
}
uint8_t ver = ((uint8_t*)_recv_buff.Ptr())[0];
uint8_t method = ((uint8_t*)_recv_buff.Ptr())[1];
if (kSocks5Version != ver) {
check_status_ = ECheckFail;
return;
}
if (kSocks5NoAuth == method) { //NO AUTHENTICATION REQUIRED
check_status_ = EProxySocks5AuthSucc;
request_send_ = true;
} else if (kSocks5UsrNamePwdAuth == method) { //USERNAME/PASSWORD
check_status_ = EProxySocks5GreetSucc;
request_send_ = true;
} else {
xwarn2("auth method not support:%d", method);
check_status_ = ECheckFail;
}
recv_buf_.Length(0, 0);
} else if(check_status_ == EProxySocks5AuthReq) {
if (_recv_buff.Length() < 2) {
xinfo2(TSF"proxy response continue:%_", _recv_buff.Length());
return;
}
uint8_t ver = ((uint8_t*)_recv_buff.Ptr())[0];
uint8_t status = ((uint8_t*)_recv_buff.Ptr())[1];
if(kSocks5AuthVersion != ver || kSocks5RespStatus != status) {
check_status_ = ECheckFail;
xwarn2("socks5 proxy auth fail: %d %d", ver, status);
return;
}
check_status_ = EProxySocks5AuthSucc;
request_send_ = true;
recv_buf_.Length(0, 0);
} else if (check_status_ == EProxySocks5ConnSvrReq) {
if (_recv_buff.Length() < 4) {
xinfo2(TSF"proxy response continue:%_", _recv_buff.Length());
return;
}
uint8_t atyp = ((uint8_t*)_recv_buff.Ptr())[3];
if (kSocksATYPIPv4 == atyp && _recv_buff.Length() < 6+4) {
xinfo2(TSF"proxy response continue:%_", _recv_buff.Length());
return;
}
if (kSocksATYPHost == atyp && _recv_buff.Length() < (size_t)(6+1+((uint8_t*)_recv_buff.Ptr())[4])) {
xinfo2(TSF"proxy response continue:%_", _recv_buff.Length());
return;
}
if (kSocksATYPIPv6 == atyp && _recv_buff.Length() < 6+16) {
xinfo2(TSF"proxy response continue:%_", _recv_buff.Length());
return;
}
uint8_t ver = ((uint8_t*)_recv_buff.Ptr())[0];
uint8_t status = ((uint8_t*)_recv_buff.Ptr())[1];
if(kSocks5Version != ver || kSocks5RespStatus != status) {
check_status_ = ECheckFail;
xwarn2("socks5 proxy connect server fail: %d %d", ver, status);
return;
}
check_status_ = (observer_ && observer_->OnShouldVerify(index_, destaddr_)) ? EProxyConnSvrSucc : ECheckOK;
checkfintime_ = gettickcount();
request_send_ = true;
recv_buf_.Length(0, 0);
} else if (check_status_ == EProxyConnSvrSucc) {
check_status_ = (observer_ && observer_->OnVerifyRecv(index_, destaddr_, sock_, _recv_buff)) ? ECheckOK : ECheckFail;
checkfintime_ = gettickcount();
} else {
xassert2(false, "socks5 proxy checkfsm status:%d", check_status_);
}
}
virtual void _OnRequestSend(AutoBuffer& _send_buff){
if (check_status_ == EConnProxySucc) {
uint8_t socks5_greet_data[] = {kSocks5Version, kSockstNAuthMethos, (username_.empty()||password_.empty())?kSocks5NoAuth:kSocks5UsrNamePwdAuth};
_send_buff.Length(0, 0);
_send_buff.Write(socks5_greet_data, sizeof(socks5_greet_data));
check_status_ = EProxySocks5GreetReq;
} else if (check_status_ == EProxySocks5GreetSucc) {
if (username_.empty() || password_.empty() || username_.size() > 255 || password_.size() > 255) {
xwarn2(TSF"username/password error:%_ %_", username_.size(), password_.size());
check_status_ = ECheckFail;
return;
}
_send_buff.Length(0, 0);
uint8_t ver = kSocks5AuthVersion;
_send_buff.Write(&ver, sizeof(ver));
uint8_t len = username_.size();
_send_buff.Write(&len, 1);
_send_buff.Write(username_.c_str(), username_.size());
len = password_.size();
_send_buff.Write(&len, 1);
_send_buff.Write(password_.c_str(), password_.size());
check_status_ = EProxySocks5AuthReq;
} else if (check_status_ == EProxySocks5AuthSucc) {
uint8_t head_data[] = {kSocks5Version, kSocks5ConnectCmd, kSocks5RsvVal, kSocksATYPIPv4};
_send_buff.Length(0, 0);
_send_buff.Write(head_data, sizeof(head_data));
uint32_t net_addr = inet_addr(destaddr_.ip());
_send_buff.Write(&net_addr, sizeof(net_addr));
uint16_t net_port = htons(destaddr_.port());
_send_buff.Write(&net_port, sizeof(net_port));
check_status_ = EProxySocks5ConnSvrReq;
} else if (check_status_ == EProxyConnSvrSucc) {
if (observer_ && !observer_->OnVerifySend(index_, destaddr_, sock_, send_buf_)) {
check_status_ = ECheckFail;
}
} else {
xassert2(false, "socks5 proxy checkfsm status:%d", check_status_);
}
}
protected:
const socket_address& destaddr_;
std::string username_;
std::string password_;
private:
static const uint8_t kSocks5Version = 0x05;
static const uint8_t kSocks5AuthVersion = 0x01;
static const uint8_t kSockstNAuthMethos = 0x01;
static const uint8_t kSocks5NoAuth = 0x00;
static const uint8_t kSocks5UsrNamePwdAuth = 0x02;
static const uint8_t kSocks5RespStatus = 0x00;
static const uint8_t kSocks5ConnectCmd = 0x01;
static const uint8_t kSocks5RsvVal = 0x00;
static const uint8_t kSocksATYPIPv4 = 0x01;
static const uint8_t kSocksATYPHost = 0x03;
static const uint8_t kSocksATYPIPv6 = 0x04;
};
static bool __isconnecting(const ConnectCheckFSM* _ref) { return NULL != _ref && INVALID_SOCKET != _ref->Socket(); }
}
SOCKET ComplexConnect::ConnectImpatient(const std::vector<socket_address>& _vecaddr, SocketBreaker& _breaker, MComplexConnect* _observer,
mars::comm::ProxyType _proxy_type, const socket_address* _proxy_addr,
const std::string& _proxy_username, const std::string& _proxy_pwd) {
trycount_ = 0;
index_ = -1;
errcode_ = 0;
index_conn_rtt_ = 0;
index_conn_totalcost_ = 0;
totalcost_ = 0;
if (_vecaddr.empty()) {
xwarn2(TSF"_vecaddr size:%_, m_timeout:%_, m_interval:%_, m_error_interval:%_, m_max_connect:%_, @%_", _vecaddr.size(), timeout_, interval_, error_interval_, max_connect_, this);
return INVALID_SOCKET;
}
xinfo2(TSF"_vecaddr size:%_, m_timeout:%_, m_interval:%_, m_error_interval:%_, m_max_connect:%_, @%_", _vecaddr.size(), timeout_, interval_, error_interval_, max_connect_, this);
uint64_t starttime = gettickcount();
std::vector<ConnectCheckFSM*> vecsocketfsm;
for (unsigned int i = 0; i < _vecaddr.size(); ++i) {
xinfo2(TSF"complex.conn %_", _vecaddr[i].url());
ConnectCheckFSM* ic = NULL;
if (mars::comm::kProxyHttpTunel == _proxy_type) {
ic = new ConnectHttpTunelCheckFSM(_vecaddr[i], *_proxy_addr, _proxy_username, _proxy_pwd, timeout_, i, _observer);
} else if (mars::comm::kProxySocks5 == _proxy_type) {
ic = new ConnectSocks5CheckFSM(_vecaddr[i], *_proxy_addr, _proxy_username, _proxy_pwd, timeout_, i, _observer);
} else {
ic = new ConnectCheckFSM(_vecaddr[i], timeout_, i, _observer);
}
vecsocketfsm.push_back(ic);
}
uint64_t curtime = gettickcount();
uint64_t laststart_connecttime = curtime - std::max(interval_, error_interval_);
xdebug2(TSF"curtime:%_, laststart_connecttime:%_, @%_", curtime, laststart_connecttime, this);
int lasterror = 0;
unsigned int index = 0;
SOCKET retsocket = INVALID_SOCKET;
do {
curtime = gettickcount();
// timeout and connect
SocketSelect sel(_breaker);
sel.PreSelect();
int next_connect_timeout = int(((0 == lasterror) ? interval_ : error_interval_) - (curtime - laststart_connecttime));
int timeout = (int)timeout_;
unsigned int runing_count = (unsigned int)std::count_if(vecsocketfsm.begin(), vecsocketfsm.end(), &__isconnecting);
if (index < vecsocketfsm.size()
&& 0 < next_connect_timeout
&& runing_count < max_connect_) {
timeout = std::min(timeout, next_connect_timeout);
}
// connect
if (index < vecsocketfsm.size()
&& 0 >= next_connect_timeout
&& runing_count < max_connect_) {
if (runing_count + 1 < max_connect_) timeout = std::min(timeout, (int)interval_);
laststart_connecttime = gettickcount();
lasterror = 0;
trycount_ = (unsigned int)(index + 1);
++index;
}
for (unsigned int i = 0; i < index; ++i) {
if (NULL == vecsocketfsm[i]) continue;
xgroup2_define(group);
vecsocketfsm[i]->PreSelect(sel, group);
xgroup2_if(!group.Empty(), TSF"index:%_, @%_, ", i, this) << group;
timeout = std::min(timeout, vecsocketfsm[i]->Timeout());
}
xdebug2(TSF"timeout:%_, @%_", timeout, this);
int ret = 0;
if (INT_MAX == timeout) {
ret = sel.Select();
} else {
timeout = std::max(0, timeout);
ret = sel.Select(timeout);
}
// select error
if (ret < 0) {
xerror2(TSF"sel ret:(%_, %_, %_), @%_", ret, sel.Errno(), socket_strerror(sel.Errno()), this);
break;
}
// user break
if (sel.IsException()) {
xerror2(TSF"sel exception @%_", this);
break;
}
if (sel.IsBreak()) {
xinfo2(TSF"sel breaker @%_", this);
break;
}
// socket
for (unsigned int i = 0; i < index; ++i) {
if (NULL == vecsocketfsm[i]) continue;
xgroup2_define(group);
vecsocketfsm[i]->AfterSelect(sel, group);
xgroup2_if(!group.Empty(), TSF"index:%_, @%_, ", i, this) << group;
if (TcpClientFSM::EEnd == vecsocketfsm[i]->Status()) {
if (_observer) _observer->OnFinished(i, socket_address(&vecsocketfsm[i]->Address()), vecsocketfsm[i]->Socket(), vecsocketfsm[i]->Error(),
vecsocketfsm[i]->Rtt(), vecsocketfsm[i]->TotalRtt(), (int)(gettickcount() - starttime));
vecsocketfsm[i]->Close();
delete vecsocketfsm[i];
vecsocketfsm[i] = NULL;
lasterror = -1;
continue;
}
if (TcpClientFSM::EReadWrite == vecsocketfsm[i]->Status() && ConnectCheckFSM::ECheckFail == vecsocketfsm[i]->CheckStatus()) {
if (_observer) _observer->OnFinished(i, socket_address(&vecsocketfsm[i]->Address()), vecsocketfsm[i]->Socket(), vecsocketfsm[i]->Error(),
vecsocketfsm[i]->Rtt(), vecsocketfsm[i]->TotalRtt(), (int)(gettickcount() - starttime));
vecsocketfsm[i]->Close();
delete vecsocketfsm[i];
vecsocketfsm[i] = NULL;
lasterror = -1;
continue;
}
if (TcpClientFSM::EReadWrite == vecsocketfsm[i]->Status() && ConnectCheckFSM::ECheckOK == vecsocketfsm[i]->CheckStatus()) {
if (_observer) _observer->OnFinished(i, socket_address(&vecsocketfsm[i]->Address()), vecsocketfsm[i]->Socket(), vecsocketfsm[i]->Error(),
vecsocketfsm[i]->Rtt(), vecsocketfsm[i]->TotalRtt(), (int)(gettickcount() - starttime));
xinfo2(TSF"index:%_, sock:%_, suc ConnectImpatient:%_:%_, RTT:(%_, %_), @%_", i, vecsocketfsm[i]->Socket(),
vecsocketfsm[i]->IP(), vecsocketfsm[i]->Port(), vecsocketfsm[i]->Rtt(), vecsocketfsm[i]->TotalRtt(), this);
retsocket = vecsocketfsm[i]->Socket();
index_ = i;
index_conn_rtt_ = vecsocketfsm[i]->Rtt();
index_conn_totalcost_ = vecsocketfsm[i]->TotalRtt();
vecsocketfsm[i]->Socket(INVALID_SOCKET);
delete vecsocketfsm[i];
vecsocketfsm[i] = NULL;
break;
}
}
// end of loop
bool all_invalid = true;
for (unsigned int i = 0; i < vecsocketfsm.size(); ++i) {
if (NULL != vecsocketfsm[i]) {
all_invalid = false;
break;
}
}
if (all_invalid || INVALID_SOCKET != retsocket) break;
} while (true);
for (unsigned int i = 0; i < vecsocketfsm.size(); ++i) {
if (NULL != vecsocketfsm[i]) {
vecsocketfsm[i]->Close(false);
delete vecsocketfsm[i];
vecsocketfsm[i] = NULL;
}
}
vecsocketfsm.clear();
totalcost_ = (int)(::gettickcount() - starttime);
xinfo2(TSF"retsocket:%_, connrtt:%_, conntotalrtt:%_, totalcost:%_, @%_", retsocket, index_conn_rtt_, index_conn_totalcost_, totalcost_, this);
return retsocket;
}
#ifdef COMPLEX_CONNECT_NAMESPACE
}
#endif