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utp_socket.cpp
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utp_socket.cpp
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#include "utp_socket.h"
#include "log_helper.h"
#include <string.h>
#include <algorithm>
#include <sstream>
#include <time.h>
#include <vector>
namespace rtttech_utp
{
using namespace std;
static const uint32_t MAX_SYN_RESEND_TIMES = 5;
static const uint32_t MAX_CLOSE_RESEND_TIMES = 10;
static const int MAX_SACK_BYTES = 100;
static const uint32_t DEFAULT_LOCAL_RECV_WINDOW = 1024*1024;
static LogHelper gHelper;
DECLARE_LOG("UTPSocket", "utp_log.txt")
static int GenerateAckBitfield(CircleSeq<uint16_t> next_expect, const std::map<CircleSeq<uint16_t>, std::shared_ptr<PacketCS>>& pkt_map, char* buff, int size)
{
RTASSERT(size % 4 == 0);
std::vector<CircleSeq<uint16_t>> seqvec;
seqvec.reserve(pkt_map.size());
std::map<CircleSeq<uint16_t>, std::shared_ptr<PacketCS>>::const_iterator iter;
for (iter = pkt_map.cbegin(); iter != pkt_map.cend(); ++iter) {
seqvec.push_back(iter->first);
}
if (size > MAX_SACK_BYTES) {
size = MAX_SACK_BYTES;
}
return GenerateAckBitfield(next_expect, seqvec, buff, size);
}
static int GetBitmapBits(CircleSeq<uint16_t> next_expect, const std::map<CircleSeq<uint16_t>, std::shared_ptr<PacketCS>>& pkt_map)
{
if (pkt_map.size() == 0)
return 0;
int bits = GetBitmapBits(next_expect, pkt_map.rbegin()->first, pkt_map.size());
return (std::min)(bits, MAX_SACK_BYTES * 8);
}
static int GetBitmapBytes(CircleSeq<uint16_t> next_expect, const std::map<CircleSeq<uint16_t>, std::shared_ptr<PacketCS>>& pkt_map)
{
int nBitmapBits = GetBitmapBits(next_expect, pkt_map);
int nBitmapBytes = (nBitmapBits + 7) / 8;
int nLeftBytes = nBitmapBytes % 4;
if (nLeftBytes != 0) {
nBitmapBytes += 4 - nLeftBytes;
}
RTASSERT(nBitmapBytes % 4 == 0);
return nBitmapBytes;
}
static int GetBitmapExtensionBytes(int bitmap_bytes)
{
RTASSERT(bitmap_bytes % 4 == 0);
if (bitmap_bytes == 0)
return 0;
else
return 2 + bitmap_bytes;
}
void HeaderToBigEndian(PacketHead* pHead)
{
pHead->conn_id = ntohs(pHead->conn_id);
pHead->timestamp = ntohl(pHead->timestamp);
pHead->timestamp_difference = ntohl(pHead->timestamp_difference);
pHead->recv_wnd = ntohl(pHead->recv_wnd);
pHead->pkt_seq = ntohs(pHead->pkt_seq);
pHead->ack_pkt_seq = ntohs(pHead->ack_pkt_seq);
}
static std::string StateDesc(RTSocketState s)
{
const char *desc[] = { "IDLE", "SYN_SENT", "SYN_RECEIVED", "ESTABLISHED", "CLOSING", "CLOSE_WAIT", "CLOSED", "ERROR" };
return desc[s];
}
static std::string PacketDesc(const PacketHead *pHeader)
{
std::ostringstream oss;
oss << "packet, cmd ";
if (pHeader->GetType() == RTC_SYN) {
oss << "SYN";
}
else if (pHeader->GetType() == RTC_DATA) {
oss << "DATA";
}
else if (pHeader->GetType() == RTC_STATE) {
oss << "STATE";
}
else if (pHeader->GetType() == RTC_FIN) {
oss << "FIN";
}
else if (pHeader->GetType() == RTC_RESET) {
oss << "RESET";
}
else {
oss << "unknown packet";
}
oss << " conn_id: " << pHeader->conn_id << " pkt_seq: " << pHeader->pkt_seq << " bytes_seq: "
<< " recv_wnd: " << pHeader->recv_wnd << " ack_pkt_seq: "
<< pHeader->ack_pkt_seq << " send pkt seq: " << pHeader->pkt_seq;
if (pHeader->extension != 0) {
PacketHeadAck *pHeaderAck = (PacketHeadAck *)pHeader;
oss <<" bitmap bytes: "<<(int)pHeaderAck->ext_len;
}
return oss.str();
}
uint32_t UTPSocket::s_nTotalTickTakeTime = 0;
UTPSocket::UTPSocket(socket_event_callback *cb, send_data_callback *pfsend, UTPClock* clock, bool passive)
:
m_bDestroyed(false),
m_pUserdata(NULL),
m_pfCallBack(cb),
m_pfSendProc(pfsend),
m_nMtu(1200),
m_nLocalExpectPktSeq(1),
m_nLocalSendPktSeq(1),
m_nLocalSendBytesSeq(0),
m_nLocalRecvWnd(DEFAULT_LOCAL_RECV_WINDOW),
m_nSendSeq(0),
m_nRemoteAckedPktSeq(0),
m_nRemoteExpectBytesSeq(0),
m_nRemoteRecvWnd(0),
m_nLocalExpectBytesSeq(0),
m_nReadableBytes(0),
m_nNotReadableBytes(0),
m_nNotAckedDataBytes(0),
m_nTotalPktNum(0),
m_nFoundLostPktNum(0),
m_nTotalSendTimes(0),
m_nError(0),
m_eState(RTSS_IDLE),
m_nStateChangeTime(0),
m_bWaitWrite(false),
m_bWaitRead(true),
m_bWaitConnect(true),
m_bEnableFec(false),
m_bFastAck(false),
m_bDelayAck(false),
m_nLastSendFec(0),
m_nLastReceivedTime(0),
m_nLastSendAck(0),
m_nConnTimeoutTime(30*1000*1000),
m_nAckInterval(100*1000),
m_nTheirTimestampDiff(0),
m_nMyTimestampDiff(0),
m_ptrCongestionController(NULL),
m_ptrRoundTripMeter(NULL),
m_bPassive(passive)
{
LOG_DEBUG(logger, "{} UTPSocket::UTPSocket", (void*)this);
m_nRemoteAckedPktSeq = m_nLocalSendPktSeq;
m_nRemoteExpectBytesSeq = m_nLocalSendBytesSeq;
//m_ptrCongestionController = new NullCongestionController(512);
m_ptrCongestionController.reset(new LedbatCongestionController(m_nMtu, m_nMtu, 100*1000));
m_ptrRoundTripMeter.reset(new SimpleRoundTripMeter());
m_ptrPacketLostCounter.reset(new LostCounter(3*1000*1000, 20));
m_ptrClocker.reset(clock);
m_nLastReceivedTime = m_ptrClocker->GetMicroSecond();
m_nLastSendAck = m_ptrClocker->GetMicroSecond();
}
UTPSocket::~UTPSocket()
{
LOG_DEBUG(logger, "{} UTPSocket::~UTPSocket", (void*)this);
LOG_INFO(logger, "{} total pkt num: {}, lost num: {}, total send times: {}", (void*)this, m_nTotalPktNum, m_nFoundLostPktNum, m_nTotalSendTimes);
}
void UTPSocket::ChangeToState(RTSocketState s)
{
LOG_INFO(logger, "{} change to state {}", (void*)this, StateDesc(s));
m_eState = s;
m_nStateChangeTime = m_ptrClocker->GetMicroSecond();
if (s == RTSS_CLOSED || s == RTSS_ERROR) {
return;//for debug
}
}
int UTPSocket::Connect(const char *to, int tolen)
{
LOG_DEBUG(logger, "{} UTPSocket::Connect", (void*)this);
if (m_eState != RTSS_IDLE) {
return RTTP_EINVAL;
}
if (to != NULL && tolen > 0)
m_strRemoteAddr.assign(to, tolen);
SendSyn();
ChangeToState(RTSS_SYN_SENT);
return 0;
}
int UTPSocket::Recv(char * buffer, int len, int flag)
{
if (m_eState != RTSS_ESTABLISHED && m_eState != RTSS_CLOSED && m_eState != RTSS_CLOSE_WAIT) {
if (m_nError != 0) {
return m_nError;
}
else {
return RTTP_EWOULDBLOCK;
}
}
if (m_nReadableBytes == 0) {
if (m_eState == RTSS_ESTABLISHED) {
m_bWaitRead = true;
return RTTP_EWOULDBLOCK;
}
else if (m_eState == RTSS_CLOSED || m_eState == RTSS_CLOSE_WAIT) {
return 0;
}
else {
RTASSERT(false);
}
}
else {
m_bWaitRead = false;
}
RTASSERT(m_deqReady4ReadPacket.size() > 0);
std::shared_ptr<PacketCS> pkt = m_deqReady4ReadPacket[0];
RTASSERT(pkt->len > pkt->pos);
int nCopyLen = (std::min)(len, pkt->len - pkt->pos);
RTASSERT(nCopyLen > 0);
memcpy(buffer, pkt->buffer + pkt->pos, nCopyLen);
pkt->pos += nCopyLen;
if (pkt->pos >= pkt->len) {
RTASSERT(pkt->pos == pkt->len);
m_deqReady4ReadPacket.pop_front();
}
uint32_t nRecvWndBefore = GetLeftRecvWndBytes();
RTASSERT(m_nReadableBytes >= nCopyLen);
m_nReadableBytes -= nCopyLen;
if (nRecvWndBefore == 0) {
SendState();
}
LOG_DEBUG(logger, "{} user recv return {} bytes", (void*)this, nCopyLen);
return nCopyLen;
}
int UTPSocket::Send(const char * buffer, int len, int flag)
{
if (m_eState != RTSS_ESTABLISHED) {
if (m_nError != 0) {
return m_nError;
}
else {
return RTTP_EWOULDBLOCK;
}
}
int nAllowWriteBytes = GetAllowWriteBytes();
LOG_INFO(logger, "{} user send data {} bytes, current congetstion wnd value:{}, current allow:{}, not acked size:{}", (void*)this,
len, m_ptrCongestionController->GetCongestionWnd(), nAllowWriteBytes, m_nNotAckedDataBytes);
if (nAllowWriteBytes < 0)
nAllowWriteBytes = 0;
int nLeftLen = (std::min)(len, nAllowWriteBytes);
int nSentLen = 0;
while (nLeftLen > 0) {
int nCurSend = (std::min)((int)m_nMtu, nLeftLen);
SendData(buffer + nSentLen, nCurSend, flag);
nLeftLen -= nCurSend;
nSentLen += nCurSend;
}
if (nSentLen < len) {
m_bWaitWrite = true;
}
else {
m_bWaitWrite = false;
}
if (nSentLen == 0) {
return RTTP_EWOULDBLOCK;
}
LOG_INFO(logger, "{} user send data {} bytes, current congetstion wnd value:{}, send return {}, not acked size:{}", (void*)this,
len, m_ptrCongestionController->GetCongestionWnd(), nSentLen, m_nNotAckedDataBytes);
return nSentLen;
}
void UTPSocket::Close()
{
LOG_DEBUG(logger, "{} UTPSocket::Close", (void*)this);
m_bWaitRead = false;
m_bWaitWrite = false;
m_bWaitConnect = false;
m_bDestroyed = true;
m_pfCallBack = nullptr;
if (m_eState == RTSS_CLOSING || m_eState == RTSS_CLOSED) {
return;
}
if (m_eState == RTSS_SYN_SENT || m_eState == RTSS_SYN_RECEIVED) {
SendClose(false);
ChangeToState(RTSS_CLOSING);
}
else if (m_eState == RTSS_ESTABLISHED) {
if (m_deqNotAckedDataPacket.size() == 0) {
SendClose(false);
}
ChangeToState(RTSS_CLOSING);//local close connection
}
else {
ChangeToState(RTSS_CLOSED);
}
}
bool UTPSocket::IsReadable()
{
if (m_eState != RTSS_ESTABLISHED && m_eState != RTSS_CLOSED && m_eState != RTSS_CLOSE_WAIT) {
return false;
}
if (m_nReadableBytes == 0) {
if (m_eState == RTSS_ESTABLISHED) {
return false;
}
else if (m_eState == RTSS_CLOSED || m_eState == RTSS_CLOSE_WAIT) {
return true;
}
else {
RTASSERT(false);
return false;
}
}
else {
return true;
}
}
bool UTPSocket::IsWritable()
{
if (m_eState != RTSS_ESTABLISHED) {
return false;
}
if (GetAllowWriteBytes() - m_nNotAckedDataBytes > 0)
return true;
else
return false;
}
bool UTPSocket::IsConnected()
{
return m_eState == RTSS_ESTABLISHED;
}
int UTPSocket::GetError()
{
return m_nError;
}
void UTPSocket::OnTick()
{
if (m_eState == RTSS_CLOSED) {
return;
}
int64_t nCurStartTime = m_ptrClocker->GetMicroSecond();
//LOG_DEBUG(logger, "on tick, time: {}", nCurTime);
if (nCurStartTime - m_nLastReceivedTime > m_nConnTimeoutTime) {
LOG_DEBUG(logger, "{} long time no receive packet, connection aborted", (void*)this);
ChangeToState(RTSS_CLOSED);
ClearConnection();
m_nError = RTTP_ECONNABORTED;
if (m_pfCallBack)
m_pfCallBack((RTSOCKET)this, RTTP_EVENT_ERROR);
return;
}
if (m_nError != 0) {
LOG_DEBUG(logger, "{} connection error:{}", (void*)this, m_nError);
ChangeToState(RTSS_CLOSED);
ClearConnection();
if (m_pfCallBack)
m_pfCallBack((RTSOCKET)this, RTTP_EVENT_ERROR);
return;
}
if (m_eState == RTSS_CLOSE_WAIT) {
if (nCurStartTime - m_nStateChangeTime > 5 * 1000 * 1000) {
LOG_DEBUG(logger, "{} RTSS_CLOSE_WAIT timeout, connection closed", (void*)this);
ClearConnection();
ChangeToState(RTSS_CLOSED);
return;
}
}
//resend command packet
for (uint32_t i = 0; i < m_deqNotAckedCmdPacket.size(); ++i) {
std::shared_ptr<PacketCS> pkt = m_deqNotAckedCmdPacket[i];
int64_t nTimeoutTime = m_ptrRoundTripMeter->GetTimeoutValue();
int64_t nElapseTime = nCurStartTime - pkt->send_time;
if (nElapseTime > nTimeoutTime || nElapseTime < 0) {
m_ptrRoundTripMeter->OnPacketLost();
if (m_eState == RTSS_SYN_SENT && pkt->resend_times > MAX_SYN_RESEND_TIMES || m_eState == RTSS_CLOSING && pkt->resend_times > MAX_CLOSE_RESEND_TIMES) {
ChangeToState(RTSS_ERROR);
m_deqNotAckedCmdPacket.clear();
m_nError = RTTP_ETIMEDOUT;
if (m_pfCallBack)
m_pfCallBack((RTSOCKET)this, RTTP_EVENT_ERROR);
return;
}
else {
ResendPacket(*pkt);
}
}
}
uint32_t nPktNum = m_deqNotAckedDataPacket.size();
uint32_t i = 0;
bool bFoundLost = false;
int64_t timeout = m_ptrRoundTripMeter->GetTimeoutValue();
int64_t nCurRTT = m_ptrRoundTripMeter->GetRTT();
LOG_DEBUG(logger, "{} current time: {}, m_deqNotAckedDataPacket size: {}, current timeout value:{}, rtt:{}", (void*)this, nCurStartTime, nPktNum, timeout, nCurRTT);
for (; i < nPktNum; ++i) {
std::shared_ptr<PacketCS> pkt = m_deqNotAckedDataPacket[i];
int64_t elapse = nCurStartTime - pkt->send_time;
if (pkt->ack_time ==0 && (elapse > timeout || elapse < 0)) {
bFoundLost = true;
LOG_DEBUG(logger, "{} current timeoutvalue: {}, elapse time: {}", (void*)this, timeout, elapse);
LOG_DEBUG(logger, "{} found packet {} lost when tick, resend time: {}, current state: {}", (void*)this, pkt->pkt_seq, pkt->resend_times, StateDesc(m_eState));
if (pkt->resend_times == 0) {
++m_nFoundLostPktNum;
LOG_INFO(logger, "{} found packet lost, timeout value:{}, current state: {}", (void*)this, timeout, StateDesc(m_eState));
}
ResendPacket(*pkt);
}
}
/*
uint32_t nPktNum = m_deqSendTimeOrderedDataPacket.size();
uint32_t i = 0;
bool bFoundLost = false;
LOG_DEBUG(logger, "{} current time: {}, m_deqSendTimeOrderedDataPacket size: {}", (void*)this, nCurStartTime, nPktNum);
int64_t timeout = m_ptrRoundTripMeter->GetTimeoutValue();
while (m_deqSendTimeOrderedDataPacket.size() > 0 && i++ < nPktNum) {
std::shared_ptr<PacketCS> pkt = m_deqSendTimeOrderedDataPacket[0];
int64_t elapse = nCurStartTime - pkt->send_time;
if (pkt->ack_time != 0) {
m_deqSendTimeOrderedDataPacket.pop_front();
continue;
}
if (elapse > timeout || elapse < 0) {
bFoundLost = true;
LOG_DEBUG(logger, "{} current timeoutvalue: {}, elapse time: {}", (void*)this, timeout, elapse);
LOG_DEBUG(logger, "{} found packet lost when tick, resend time: {}, current state: {}", (void*)this, pkt->resend_times, StateDesc(m_eState));
if (pkt->resend_times == 0) {
++m_nFoundLostPktNum;
m_ptrPacketLostCounter->OnPacketLost(nCurStartTime);
LOG_INFO(logger, "{} found packet lost, timeout value:{}, current state: {}", (void*)this, timeout, StateDesc(m_eState));
}
m_deqSendTimeOrderedDataPacket.pop_front();
m_deqSendTimeOrderedDataPacket.push_back(pkt);
ResendPacket(*pkt);
}
else {
//for test
LOG_INFO(logger, "{} left not timeout packet:", (void*)this);
for (size_t i = 0; i < m_deqSendTimeOrderedDataPacket.size(); ++i) {
LOG_INFO(logger, "{} {}", (void*)this, m_deqSendTimeOrderedDataPacket[i]->Desc());
}
break;
}
}
*/
if (bFoundLost) {
m_ptrCongestionController->OnPacketLost(nCurStartTime);
m_ptrRoundTripMeter->OnPacketLost();
}
if (nCurStartTime - m_nLastSendAck > GetAckInterval() && (m_eState == RTSS_ESTABLISHED || m_eState == RTSS_CLOSING)) {
SendState();
}
m_nTickTakeTime = m_ptrClocker->GetMicroSecond() - nCurStartTime;
}
int UTPSocket::OnPacket(const char* buffer, int len, const char *from, int from_len)
{
const PacketHead * header = (const PacketHead *)buffer;
if (from != NULL && from_len > 0)
m_strRemoteAddr.assign(from, from_len);
m_nLastReceivedTime = m_ptrClocker->GetMicroSecond();
/////////////////////////////////////////////////////////////////////////////////////////
uint32_t nMyTimeLowPart = uint32_t(m_nLastReceivedTime & 0xFFFFFFFF);
m_nTheirTimestampDiff = nMyTimeLowPart - header->timestamp;
uint64_t nCurMS = m_ptrClocker->GetMicroSecond() / 1000;
m_RemoteDelayHistory.AddSample(m_nTheirTimestampDiff, nCurMS);
LOG_DEBUG(logger, "{} their time stamp diff sample: {}, my time low part:{}, send time stamp:{}", (void*)this, m_RemoteDelayHistory.GetValue(), nMyTimeLowPart, header->timestamp);
if (header->timestamp_difference != 0) {
m_nMyTimestampDiff = header->timestamp_difference;
m_MyDelayHistory.AddSample(m_nMyTimestampDiff, nCurMS);
m_ptrCongestionController->OnPacketTripTime(m_ptrClocker->GetMicroSecond(), m_MyDelayHistory.GetValue(), m_ptrRoundTripMeter->GetRTT(), m_nNotAckedDataBytes);
m_ptrRoundTripMeter->OnPacketAcked();
LOG_DEBUG(logger, "{} my time stamp diff sample: {}, congestion control wnd: {}", (void*)this, m_MyDelayHistory.GetValue(), m_ptrCongestionController->GetCongestionWnd());
}
/////////////////////////////////////////////////////////////////////////////////////////////////
switch (header->GetType()) {
case RTC_DATA:
//std::cout << "data packet" << endl;
OnData(header, len);
break;
case RTC_STATE:
//std::cout << "ack packet" << endl;
LOG_DEBUG(logger, "{} received state {}", (void*)this, PacketDesc(header));
OnState(header, len);
break;
case RTC_SYN:
OnSyn(header, len);
break;
case RTC_FIN:
OnClose(header, len);
break;
case RTC_RESET:
OnReset(header, len);
break;
default:
return -1;
}
if (m_bWaitConnect && m_eState == RTSS_ESTABLISHED) {
m_bWaitConnect = false;
if (m_pfCallBack)
m_pfCallBack((RTSOCKET)this, RTTP_EVENT_CONNECT);
}
if (m_bWaitRead && IsReadable()) {
m_bWaitRead = false;
if (m_pfCallBack)
m_pfCallBack((RTSOCKET)this, RTTP_EVENT_READ);
}
if (m_bWaitWrite && m_eState == RTSS_ESTABLISHED ) {
if (IsWritable()) {
m_bWaitWrite = false;
if (m_pfCallBack)
m_pfCallBack((RTSOCKET)this, RTTP_EVENT_WRITE);
}
}
return 0;
}
int UTPSocket::DoSendData(char* buffer, int len, bool withack)
{
HeaderToBigEndian((PacketHead*)buffer);
if (withack) {
m_nLastSendAck = m_ptrClocker->GetMicroSecond();
}
if (m_pfSendProc) {
m_pfSendProc((RTSOCKET)this, buffer, len, m_strRemoteAddr.c_str(), m_strRemoteAddr.size());
}
else {
RTASSERT(false);
}
return 0;
}
int UTPSocket::SendSyn(bool ack)
{
std::shared_ptr<PacketCS> pcs(new PacketCS());
int nBuffSize = sizeof(PacketHead);
RTASSERT(pcs->buffer == NULL);
pcs->buffer = new char[nBuffSize];
pcs->len = nBuffSize;
pcs->pos = 0;
pcs->resend_times = 0;
pcs->send_time = m_ptrClocker->GetMicroSecond();
PacketHead *pHead = (PacketHead*)pcs->buffer;
FillPacketHead(pHead, RTC_SYN, 0, 0);
pcs->pkt_cmd = pHead->GetType();
pcs->pkt_head_len = sizeof(PacketHead);
pcs->pkt_data_bytes = 0;
pcs->pkt_bitmap_bytes = 0;
pcs->pkt_seq = pHead->pkt_seq;
if (!ack)
m_deqNotAckedCmdPacket.push_back(pcs);
LOG_DEBUG(logger, "{} send syn {}", (void*)this, PacketDesc(pHead));
DoSendData(pcs->buffer, nBuffSize, ack);
m_nLocalSendPktSeq += 1;
return 0;
}
int UTPSocket::SendReset()
{
const int nBuffSize = 1500;
char buff[nBuffSize];
char *pBuffer = buff;
PacketHead *pHead = (PacketHead*)pBuffer;
FillPacketHead(pHead, RTC_RESET, 0, 0);
LOG_DEBUG(logger, "{} send reset {}", (void*)this, PacketDesc(pHead));
DoSendData(pBuffer, nBuffSize, true);
m_nLocalSendPktSeq += 1;
return 0;
}
int UTPSocket::SendData(const char * buffer, int len, int flag)
{
int nBitmapBytes = GetBitmapBytes(m_nLocalExpectPktSeq, m_mapReceivedPacket);
int nBuffSize = sizeof(PacketHead) + GetBitmapExtensionBytes(nBitmapBytes) + len;
char *pBuffer = new char[nBuffSize];
PacketHead *pHead = (PacketHead*)pBuffer;
int nHeadLen = FillPacketHead(pHead, RTC_DATA, len, nBitmapBytes);
memcpy(pBuffer + nHeadLen, buffer, len);
LOG_DEBUG(logger, "{} send data {}", (void*)this, PacketDesc(pHead));
++m_nTotalSendTimes;
std::shared_ptr<PacketCS> pkt(new PacketCS());
pkt->buffer = pBuffer;
pkt->len = nBuffSize;
pkt->pos = 0;
pkt->pkt_cmd = RTC_DATA;
pkt->pkt_seq = pHead->pkt_seq;
pkt->pkt_data_bytes = len;
pkt->pkt_head_len = nHeadLen;
pkt->pkt_bitmap_bytes = nBitmapBytes;
pkt->send_time = m_ptrClocker->GetMicroSecond();
DoSendData(pBuffer, nBuffSize, true);
m_nLocalSendPktSeq += 1;
m_nLocalSendBytesSeq += len;
m_deqNotAckedDataPacket.push_back(pkt);
//m_deqSendTimeOrderedDataPacket.push_back(pkt);
++m_nTotalPktNum;
m_nNotAckedDataBytes += len;
return 0;
}
int UTPSocket::SendState()
{
int nBitmapBytes = GetBitmapBytes(m_nLocalExpectPktSeq, m_mapReceivedPacket);
int nBuffSize = sizeof(PacketHead) + GetBitmapExtensionBytes(nBitmapBytes);
char buff[1500];
char *pBuffer = buff;
PacketHead *pHead = (PacketHead*)pBuffer;
FillPacketHead(pHead, RTC_STATE, 0, nBitmapBytes);
LOG_DEBUG(logger, "{} send state {}", (void*)this, PacketDesc(pHead));
DoSendData(pBuffer, nBuffSize, true);
return 0;
}
int UTPSocket::SendClose(bool resp)
{
std::shared_ptr<PacketCS> pcs(new PacketCS());
int nBuffSize = sizeof(PacketHead);
pcs->buffer = new char[nBuffSize];
pcs->len = nBuffSize;
pcs->pos = 0;
pcs->resend_times = 0;
pcs->send_time = m_ptrClocker->GetMicroSecond();
PacketHead *pHead = (PacketHead*)pcs->buffer;
FillPacketHead(pHead, RTC_FIN, 0, 0);
pcs->pkt_cmd = RTC_FIN;
pcs->pkt_head_len = sizeof(PacketHead);
pcs->pkt_data_bytes = 0;
pcs->pkt_bitmap_bytes = 0;
pcs->pkt_seq = pHead->pkt_seq;
if (!resp)
m_deqNotAckedCmdPacket.push_back(pcs);
LOG_DEBUG(logger, "{} send close {}", (void*)this, PacketDesc(pHead));
DoSendData(pcs->buffer, nBuffSize, false);
return 0;
}
void UTPSocket::OnSyn(const PacketHead *pHeader, int nPktLen)
{
LOG_DEBUG(logger, "{} received syn {}", (void*)this, PacketDesc(pHeader));
if (!m_bPassive) {
SendReset();
}
if (m_eState != RTSS_IDLE && m_eState != RTSS_SYN_RECEIVED)
return;
if (m_eState != RTSS_SYN_RECEIVED) {
m_nLocalSendPktSeq = rand() % 65535;
m_nConnID = pHeader->conn_id;
m_nLocalExpectPktSeq = pHeader->pkt_seq + 1;
ChangeToState(RTSS_SYN_RECEIVED);
}
SendState();
}
int UTPSocket::OnAck(const PacketHead *pHeader, int nPktLen)
{
int64_t nStartTime = m_ptrClocker->GetMicroSecond();
LOG_INFO(logger, "{} ack seq:{}, remote ack seq:{}", (void*)this, pHeader->ack_pkt_seq, (uint16_t)m_nRemoteAckedPktSeq);
if (m_deqNotAckedDataPacket.size() > 0) {
LOG_INFO(logger, "{} not acked first pkt seq:{}", (void*)this, m_deqNotAckedDataPacket[0]->pkt_seq);
}
if (CircleSeq<uint16_t>(pHeader->ack_pkt_seq) >= m_nRemoteAckedPktSeq) {
m_nRemoteRecvWnd = pHeader->recv_wnd;
m_nRemoteAckedPktSeq = pHeader->ack_pkt_seq;
}
else {
LOG_INFO(logger, "{} ack pkt seq < m_nRemoteAckedPktSeq, ignore", (void*)this);
return -1;
}
bool bNotifyWrite = false;
while (m_deqNotAckedDataPacket.size() > 0) {
std::shared_ptr<PacketCS> pcs = m_deqNotAckedDataPacket[0];
int64_t nCurTime = m_ptrClocker->GetMicroSecond();
if (CircleSeq<uint16_t>(pcs->pkt_seq) <= m_nRemoteAckedPktSeq) {
if (pcs->ack_time == 0) {
pcs->ack_time = nCurTime;
int64_t rtt = pcs->ack_time - pcs->send_time;
if (pcs->resend_times == 0) {
m_ptrRoundTripMeter->OnPacketAcked(rtt);
m_ptrPacketLostCounter->OnPacketAcked(nCurTime);
}
else {
m_ptrRoundTripMeter->OnPacketAcked();
}
m_ptrCongestionController->OnPacketAcked(nCurTime, rtt);
LOG_INFO(logger, "{} ack: rtt: {}, timeout value: {}", (void*)this, rtt, m_ptrRoundTripMeter->GetTimeoutValue());
}
bNotifyWrite = true;
m_nNotAckedDataBytes -= pcs->pkt_data_bytes;
m_deqNotAckedDataPacket.pop_front();
LOG_INFO(logger, "{} pkt: {} acked, remove from m_deqNotAckedDataPacket", (void*)this, pcs->pkt_seq);
}
else {
if (CircleSeq<uint16_t>(pcs->pkt_seq) == m_nRemoteAckedPktSeq + 1) {
pcs->wanted_times++;
if (pcs->wanted_times == 4 && pcs->resend_times == 0) {
LOG_INFO(logger, "{} {} packet was wanted 4 times, fast resend it", (void*)this, pcs->pkt_seq);
ResendPacket(*pcs);
}
}
else {
RTASSERT(false);
}
break;
}
}
uint8_t nCurExtension = pHeader->extension;
const uint8_t* pStartPos = (const uint8_t*)pHeader + sizeof(PacketHead);
const uint8_t* pCurPos = pStartPos ;
while (nCurExtension != 0) {
if (pCurPos + 2 - pStartPos > nPktLen) {
LOG_INFO(logger, "{} invalid packet with extension", (void*)this);
return -1;
}
uint8_t nNextExtension = *pCurPos++;
uint8_t nCurExtLen = *pCurPos++;
if (pCurPos + nCurExtLen - pStartPos > nPktLen) {
LOG_INFO(logger, "{} invalid packet with extension", (void*)this);
return -1;
}
if (nCurExtension == EXT_SACK) {
int nBitmapBytes = nCurExtLen;
const char* pBitmapStart = (const char*)pCurPos;
LOG_DEBUG(logger, "{} bitmap bytes: {}, bitmap: {}", (void*)this, nBitmapBytes, Bitmap01String(pBitmapStart, nBitmapBytes));
if (m_deqNotAckedDataPacket.size() > 0) {
RTASSERT(CircleSeq<uint16_t>(m_deqNotAckedDataPacket[0]->pkt_seq) == CircleSeq<uint16_t>(pHeader->ack_pkt_seq) + 1);
}
for (size_t i = 1; i < m_deqNotAckedDataPacket.size(); ++i) {
std::shared_ptr<PacketCS> pcs = m_deqNotAckedDataPacket[i];
uint64_t nCurTime = m_ptrClocker->GetMicroSecond();
int pos = (uint16_t)(CircleSeq<uint16_t>(pcs->pkt_seq) - CircleSeq<uint16_t>(pHeader->ack_pkt_seq) - 2);
RTASSERT(pos >= 0);
if (pos < nBitmapBytes * 8) {
if (BitmapGet(pos, pBitmapStart, nBitmapBytes)) {
if (pcs->ack_time == 0) {
pcs->ack_time = nCurTime;
int64_t rtt = pcs->ack_time - pcs->send_time;
if (pcs->resend_times == 0) {
m_ptrRoundTripMeter->OnPacketAcked(rtt);
m_ptrPacketLostCounter->OnPacketAcked(nCurTime);
}
else {
m_ptrRoundTripMeter->OnPacketAcked();
}
m_ptrCongestionController->OnPacketAcked(nCurTime, rtt);
LOG_INFO(logger, "{} bitmap ack: pkt:{} rtt: {}, sendtime:{}, rsend_times:{} cur_time:{}, timeout value: {}", (void*)this,
pcs->pkt_seq, rtt, pcs->send_time, pcs->resend_times, nCurTime, m_ptrRoundTripMeter->GetTimeoutValue());
}
}
}
else {
break;
}
}
}
pCurPos += nCurExtLen;
nCurExtension = nNextExtension;
}
if (m_eState == RTSS_CLOSING) {
if (m_deqNotAckedDataPacket.size() == 0 && m_deqNotAckedCmdPacket.size() == 0) {
SendClose(false);
}
}
m_nAckTakeTime = m_ptrClocker->GetMicroSecond() - nStartTime;
return pCurPos - pStartPos;
}
void UTPSocket::OnState(const PacketHead *pHeader, int nPktLen)
{
LOG_DEBUG(logger, "{} on state {}", (void*)this, PacketDesc(pHeader));
if (m_eState == RTSS_SYN_SENT) {
if (CircleSeq<uint16_t>(pHeader->ack_pkt_seq) == m_nLocalSendPktSeq - 1) {
m_nLocalExpectPktSeq = CircleSeq<uint16_t>(pHeader->pkt_seq);
m_deqNotAckedCmdPacket.clear();
ChangeToState(RTSS_ESTABLISHED);
}
else {
return;
}
}
if (!IsPacketValid(pHeader)) {
LOG_DEBUG(logger, "{} state not in recv window", (void*)this);
return;
}
OnAck(pHeader, nPktLen);
}
int UTPSocket::ResendPacket(PacketCS &pkt)
{
if (pkt.pkt_head_len + pkt.pkt_data_bytes != pkt.len) {
RTASSERT(false);
}
int nBitmapBytes = GetBitmapBytes(m_nLocalExpectPktSeq, m_mapReceivedPacket);
PacketHead *pHeader = (PacketHead*)pkt.buffer;
char *pBuffer = NULL;
int nHeadLen = pkt.pkt_head_len;
uint32_t nPktSeq = pkt.pkt_seq;
uint8_t nCmd = pkt.pkt_cmd;
RTASSERT(pkt.pkt_data_bytes >= 0);