273 lines
9 KiB
C++
273 lines
9 KiB
C++
/// \file Buffer/main.cpp
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/// Contains the main code for the Buffer.
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#include <fcntl.h>
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#include <iostream>
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#include <string>
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#include <vector>
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#include <cstdlib>
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#include <cstdio>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include <sstream>
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#include <sys/time.h>
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#include "../util/dtsc.h" //DTSC support
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#include "../util/socket.h" //Socket lib
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#include "../util/json.h"
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#include "../util/tinythread.h"
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/// Holds all code unique to the Buffer.
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namespace Buffer{
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class user;//forward declaration
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JSON::Value Storage; ///< Global storage of data.
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DTSC::Stream * Strm = 0;
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std::string waiting_ip = ""; ///< IP address for media push.
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Socket::Connection ip_input; ///< Connection used for media push.
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tthread::mutex stats_mutex; ///< Mutex for stats modifications.
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tthread::mutex transfer_mutex; ///< Mutex for data transfers.
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tthread::mutex socket_mutex; ///< Mutex for user deletion/work.
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bool buffer_running = true; ///< Set to false when shutting down.
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std::vector<user> users; ///< All connected users.
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std::vector<user>::iterator usersIt; ///< Iterator for all connected users.
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std::string name; ///< Name for this buffer.
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tthread::condition_variable moreData; ///< Triggered when more data becomes available.
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/// Gets the current system time in milliseconds.
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unsigned int getNowMS(){
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timeval t;
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gettimeofday(&t, 0);
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return t.tv_sec + t.tv_usec/1000;
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}//getNowMS
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///A simple signal handler that ignores all signals.
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void termination_handler (int signum){
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switch (signum){
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case SIGKILL: buffer_running = false; break;
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case SIGPIPE: return; break;
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default: return; break;
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}
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}
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}
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#include "stats.cpp"
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#include "user.cpp"
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namespace Buffer{
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void handleStats(void * empty){
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if (empty != 0){return;}
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Socket::Connection StatsSocket = Socket::Connection("/tmp/ddv_statistics", true);
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while (buffer_running){
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usleep(1000000); //sleep one second
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unsigned int now = time(0);
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unsigned int tot_up = 0, tot_down = 0, tot_count = 0;
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stats_mutex.lock();
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if (users.size() > 0){
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for (usersIt = users.begin(); usersIt != users.end(); usersIt++){
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tot_down += usersIt->curr_down;
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tot_up += usersIt->curr_up;
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tot_count++;
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}
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}
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Storage["totals"]["down"] = tot_down;
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Storage["totals"]["up"] = tot_up;
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Storage["totals"]["count"] = tot_count;
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Storage["totals"]["now"] = now;
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Storage["totals"]["buffer"] = name;
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if (!StatsSocket.connected()){
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StatsSocket = Socket::Connection("/tmp/ddv_statistics", true);
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}
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if (StatsSocket.connected()){
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StatsSocket.write(Storage.toString()+"\n\n");
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Storage["log"].null();
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}
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stats_mutex.unlock();
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}
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}
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void handleUser(void * v_usr){
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user * usr = (user*)v_usr;
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std::cerr << "Thread launched for user " << usr->MyStr << ", socket number " << usr->S.getSocket() << std::endl;
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usr->myRing = Strm->getRing();
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if (!usr->S.write(Strm->outHeader())){
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usr->Disconnect("failed to receive the header!");
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return;
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}
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while (usr->S.connected()){
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usleep(5000); //sleep 5ms
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if (usr->S.canRead()){
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usr->inbuffer.clear();
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char charbuf;
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while ((usr->S.iread(&charbuf, 1) == 1) && charbuf != '\n' ){
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usr->inbuffer += charbuf;
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}
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if (usr->inbuffer != ""){
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if (usr->inbuffer[0] == 'P'){
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std::cout << "Push attempt from IP " << usr->inbuffer.substr(2) << std::endl;
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if (usr->inbuffer.substr(2) == waiting_ip){
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if (!ip_input.connected()){
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std::cout << "Push accepted!" << std::endl;
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ip_input = usr->S;
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usr->S = Socket::Connection(-1);
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return;
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}else{
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usr->Disconnect("Push denied - push already in progress!");
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}
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}else{
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usr->Disconnect("Push denied - invalid IP address!");
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}
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}
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if (usr->inbuffer[0] == 'S'){
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stats_mutex.lock();
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usr->tmpStats = Stats(usr->inbuffer.substr(2));
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unsigned int secs = usr->tmpStats.conntime - usr->lastStats.conntime;
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if (secs < 1){secs = 1;}
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usr->curr_up = (usr->tmpStats.up - usr->lastStats.up) / secs;
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usr->curr_down = (usr->tmpStats.down - usr->lastStats.down) / secs;
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usr->lastStats = usr->tmpStats;
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Storage["curr"][usr->MyStr]["connector"] = usr->tmpStats.connector;
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Storage["curr"][usr->MyStr]["up"] = usr->tmpStats.up;
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Storage["curr"][usr->MyStr]["down"] = usr->tmpStats.down;
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Storage["curr"][usr->MyStr]["conntime"] = usr->tmpStats.conntime;
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Storage["curr"][usr->MyStr]["host"] = usr->tmpStats.host;
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Storage["curr"][usr->MyStr]["start"] = (unsigned int) time(0) - usr->tmpStats.conntime;
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stats_mutex.unlock();
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}
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}
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}
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usr->Send();
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}
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stats_mutex.lock();
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if (users.size() > 0){
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for (usersIt = users.begin(); usersIt != users.end(); usersIt++){
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if (!(*usersIt).S.connected()){
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users.erase(usersIt);
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break;
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}
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}
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}
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stats_mutex.unlock();
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std::cerr << "User " << usr->MyStr << " disconnected, socket number " << usr->S.getSocket() << std::endl;
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}
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void handleStdin(void * empty){
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if (empty != 0){return;}
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unsigned int lastPacketTime = 0;//time in MS last packet was parsed
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unsigned int currPacketTime = 0;//time of the last parsed packet (current packet)
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unsigned int prevPacketTime = 0;//time of the previously parsed packet (current packet - 1)
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std::string inBuffer;
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char charBuffer[1024*10];
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unsigned int charCount;
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unsigned int now;
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while (std::cin.good() && buffer_running){
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//slow down packet receiving to real-time
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now = getNowMS();
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if ((now - lastPacketTime > currPacketTime - prevPacketTime) || (currPacketTime <= prevPacketTime)){
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std::cin.read(charBuffer, 1024*10);
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charCount = std::cin.gcount();
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inBuffer.append(charBuffer, charCount);
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transfer_mutex.lock();
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if (Strm->parsePacket(inBuffer)){
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Strm->outPacket(0);
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lastPacketTime = now;
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prevPacketTime = currPacketTime;
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currPacketTime = Strm->getTime();
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moreData.notify_all();
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}
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transfer_mutex.unlock();
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}else{
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if (((currPacketTime - prevPacketTime) - (now - lastPacketTime)) > 1000){
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usleep(1000000);
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}else{
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usleep(((currPacketTime - prevPacketTime) - (now - lastPacketTime)) * 1000);
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}
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}
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}
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buffer_running = false;
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}
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/// Starts a loop, waiting for connections to send data to.
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int Start(int argc, char ** argv) {
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//first make sure no segpipe signals will kill us
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struct sigaction new_action;
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new_action.sa_handler = termination_handler;
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sigemptyset (&new_action.sa_mask);
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new_action.sa_flags = 0;
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sigaction (SIGPIPE, &new_action, NULL);
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sigaction (SIGKILL, &new_action, NULL);
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//then check and parse the commandline
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if (argc < 2) {
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std::cout << "usage: " << argv[0] << " streamName [awaiting_IP]" << std::endl;
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return 1;
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}
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name = argv[1];
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bool ip_waiting = false;
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if (argc >= 4){
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waiting_ip += argv[2];
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ip_waiting = true;
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}
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std::string shared_socket = "/tmp/shared_socket_";
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shared_socket += name;
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Socket::Server SS(shared_socket, false);
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Strm = new DTSC::Stream(5);
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Socket::Connection incoming;
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Socket::Connection std_input(fileno(stdin));
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Storage["log"].null();
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Storage["curr"].null();
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Storage["totals"].null();
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//tthread::thread StatsThread = tthread::thread(handleStats, 0);
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tthread::thread * StdinThread = 0;
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if (!ip_waiting){
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StdinThread = new tthread::thread(handleStdin, 0);
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}
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while (buffer_running){
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//check for new connections, accept them if there are any
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//starts a thread for every accepted connection
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incoming = SS.accept(false);
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if (incoming.connected()){
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stats_mutex.lock();
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users.push_back(incoming);
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user * usr_ptr = &(users.back());
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stats_mutex.unlock();
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usr_ptr->Thread = new tthread::thread(handleUser, (void *)usr_ptr);
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}
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}//main loop
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// disconnect listener
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/// \todo Deal with EOF more nicely - doesn't send the end of the stream to all users!
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buffer_running = false;
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std::cout << "Buffer shutting down" << std::endl;
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SS.close();
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//StatsThread.join();
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if (StdinThread){StdinThread->join();}
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if (users.size() > 0){
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stats_mutex.lock();
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for (usersIt = users.begin(); usersIt != users.end(); usersIt++){
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if ((*usersIt).S.connected()){
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(*usersIt).Disconnect("Terminating...");
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}
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}
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stats_mutex.unlock();
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}
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delete Strm;
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return 0;
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}
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};//Buffer namespace
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/// Entry point for Buffer, simply calls Buffer::Start().
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int main(int argc, char ** argv){
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return Buffer::Start(argc, argv);
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}//main
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