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#include "lscpserver.h" |
#include "lscpserver.h" |
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#include "lscpresultset.h" |
#include "lscpresultset.h" |
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#include "lscpevent.h" |
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#include "../engines/gig/Engine.h" |
#include "../engines/gig/Engine.h" |
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#include "../audiodriver/AudioOutputDeviceFactory.h" |
#include "../audiodriver/AudioOutputDeviceFactory.h" |
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#include "../mididriver/MidiInputDeviceFactory.h" |
#include "../mididriver/MidiInputDeviceFactory.h" |
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/** |
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* Below are a few static members of the LSCPServer class. |
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* The big assumption here is that LSCPServer is going to remain a singleton. |
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* These members are used to support client connections. |
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* Class handles multiple connections at the same time using select() and non-blocking recv() |
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* Commands are processed by a single LSCPServer thread. |
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* Notifications are delivered either by the thread that originated them |
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* or (if the resultset is currently in progress) by the LSCPServer thread |
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* after the resultset was sent out. |
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* This makes sure that resultsets can not be interrupted by notifications. |
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* This also makes sure that the thread sending notification is not blocked |
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* by the LSCPServer thread. |
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*/ |
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fd_set LSCPServer::fdSet; |
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int LSCPServer::currentSocket = -1; |
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std::vector<int> LSCPServer::hSessions = std::vector<int>(); |
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std::map<int,String> LSCPServer::bufferedNotifies = std::map<int,String>(); |
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std::map<int,String> LSCPServer::bufferedCommands = std::map<int,String>(); |
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std::map< LSCPEvent::event_t, std::list<int> > LSCPServer::eventSubscriptions = std::map< LSCPEvent::event_t, std::list<int> >(); |
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Mutex LSCPServer::NotifyMutex = Mutex(); |
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Mutex LSCPServer::NotifyBufferMutex = Mutex(); |
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Mutex LSCPServer::SubscriptionMutex = Mutex(); |
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LSCPServer::LSCPServer(Sampler* pSampler) : Thread(false, 0, -4) { |
LSCPServer::LSCPServer(Sampler* pSampler) : Thread(false, 0, -4) { |
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this->pSampler = pSampler; |
this->pSampler = pSampler; |
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LSCPEvent::RegisterEvent(LSCPEvent::event_channels, "CHANNELS"); |
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LSCPEvent::RegisterEvent(LSCPEvent::event_voice_count, "VOICE_COUNT"); |
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LSCPEvent::RegisterEvent(LSCPEvent::event_stream_count, "STREAM_COUNT"); |
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LSCPEvent::RegisterEvent(LSCPEvent::event_buffer_fill, "BUFFER_FILL"); |
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LSCPEvent::RegisterEvent(LSCPEvent::event_info, "INFO"); |
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LSCPEvent::RegisterEvent(LSCPEvent::event_misc, "MISCELLANEOUS"); |
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} |
} |
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int LSCPServer::Main() { |
int LSCPServer::Main() { |
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hSocket = socket(AF_INET, SOCK_STREAM, 0); |
int hSocket = socket(AF_INET, SOCK_STREAM, 0); |
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if (hSocket < 0) { |
if (hSocket < 0) { |
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std::cerr << "LSCPServer: Could not create server socket." << std::endl; |
std::cerr << "LSCPServer: Could not create server socket." << std::endl; |
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//return -1; |
//return -1; |
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// now wait for client connections and handle their requests |
// now wait for client connections and handle their requests |
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sockaddr_in client; |
sockaddr_in client; |
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int length = sizeof(client); |
int length = sizeof(client); |
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struct timeval tv; |
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tv.tv_sec = 30; |
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tv.tv_usec = 0; |
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FD_ZERO(&fdSet); |
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FD_SET(hSocket, &fdSet); |
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int maxSessions = hSocket; |
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// Parser initialization |
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yyparse_param_t yyparse_param; |
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yyparse_param.pServer = this; |
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while (true) { |
while (true) { |
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hSession = accept(hSocket, (sockaddr*) &client, (socklen_t*) &length); |
fd_set selectSet = fdSet; |
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if (hSession < 0) { |
int retval = select(maxSessions+1, &selectSet, NULL, NULL, &tv); |
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std::cerr << "LSCPServer: Client connection failed." << std::endl; |
if (retval == 0) |
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close(hSocket); |
continue; //Nothing in 30 seconds, try again |
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//return -1; |
if (retval == -1) { |
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exit(EXIT_FAILURE); |
std::cerr << "LSCPServer: Socket select error." << std::endl; |
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} |
close(hSocket); |
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exit(EXIT_FAILURE); |
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dmsg(1,("LSCPServer: Client connection established.\n")); |
} |
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//send(hSession, "Welcome!\r\n", 10, 0); |
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//Accept new connections now (if any) |
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// Parser invocation |
if (FD_ISSET(hSocket, &selectSet)) { |
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yyparse_param_t yyparse_param; |
int socket = accept(hSocket, (sockaddr*) &client, (socklen_t*) &length); |
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yyparse_param.pServer = this; |
if (socket < 0) { |
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yylex_init(&yyparse_param.pScanner); |
std::cerr << "LSCPServer: Client connection failed." << std::endl; |
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while (yyparse(&yyparse_param) == LSCP_SYNTAX_ERROR); // recall parser in case of syntax error |
exit(EXIT_FAILURE); |
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yylex_destroy(yyparse_param.pScanner); |
} |
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if (fcntl(socket, F_SETFL, O_NONBLOCK)) { |
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std::cerr << "LSCPServer: F_SETFL O_NONBLOCK failed." << std::endl; |
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exit(EXIT_FAILURE); |
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} |
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hSessions.push_back(socket); |
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FD_SET(socket, &fdSet); |
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if (socket > maxSessions) |
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maxSessions = socket; |
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dmsg(1,("LSCPServer: Client connection established on socket:%d.\n", socket)); |
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LSCPServer::SendLSCPNotify(LSCPEvent(LSCPEvent::event_misc, "Client connection established on socket", socket)); |
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continue; //Maybe this was the only selected socket, better select again |
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} |
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//Something was selected and it was not the hSocket, so it must be some command(s) coming. |
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for (std::vector<int>::iterator iter = hSessions.begin(); iter != hSessions.end(); iter++) { |
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if (FD_ISSET(*iter, &selectSet)) { //Was it this socket? |
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if (GetLSCPCommand(iter)) { //Have we read the entire command? |
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dmsg(3,("LSCPServer: Got command on socket %d, calling parser.\n", currentSocket)); |
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yylex_init(&yyparse_param.pScanner); |
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currentSocket = *iter; //a hack |
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int result = yyparse(&yyparse_param); |
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currentSocket = -1; //continuation of a hack |
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dmsg(3,("LSCPServer: Done parsing on socket %d.\n", currentSocket)); |
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if (result == LSCP_QUIT) { //Was it a quit command by any chance? |
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CloseConnection(iter); |
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} |
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} |
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//socket may have been closed, iter may be invalid, get out of the loop for now. |
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//we'll be back if there is data. |
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break; |
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} |
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} |
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close(hSession); |
//Now let's deliver late notifies (if any) |
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dmsg(1,("LSCPServer: Client connection terminated.\n")); |
NotifyBufferMutex.Lock(); |
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for (std::map<int,String>::iterator iterNotify = bufferedNotifies.begin(); iterNotify != bufferedNotifies.end(); iterNotify++) { |
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send(iterNotify->first, iterNotify->second.c_str(), iterNotify->second.size(), 0); |
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bufferedNotifies.erase(iterNotify); |
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} |
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NotifyBufferMutex.Unlock(); |
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} |
} |
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//It will never get here anyway |
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//yylex_destroy(yyparse_param.pScanner); |
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} |
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void LSCPServer::CloseConnection( std::vector<int>::iterator iter ) { |
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int socket = *iter; |
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dmsg(1,("LSCPServer: Client connection terminated on socket:%d.\n",socket)); |
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LSCPServer::SendLSCPNotify(LSCPEvent(LSCPEvent::event_misc, "Client connection terminated on socket", socket)); |
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hSessions.erase(iter); |
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FD_CLR(socket, &fdSet); |
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SubscriptionMutex.Lock(); //Must unsubscribe this socket from all events (if any) |
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for (std::map< LSCPEvent::event_t, std::list<int> >::iterator iter = eventSubscriptions.begin(); iter != eventSubscriptions.end(); iter++) { |
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iter->second.remove(socket); |
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} |
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SubscriptionMutex.Unlock(); |
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NotifyMutex.Lock(); |
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bufferedCommands.erase(socket); |
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bufferedNotifies.erase(socket); |
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close(socket); |
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NotifyMutex.Unlock(); |
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} |
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void LSCPServer::SendLSCPNotify( LSCPEvent event ) { |
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SubscriptionMutex.Lock(); |
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if (eventSubscriptions.count(event.GetType()) == 0) { |
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SubscriptionMutex.Unlock(); //Nobody is subscribed to this event |
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return; |
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} |
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std::list<int>::iterator iter = eventSubscriptions[event.GetType()].begin(); |
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std::list<int>::iterator end = eventSubscriptions[event.GetType()].end(); |
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String notify = event.Produce(); |
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while (true) { |
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if (NotifyMutex.Trylock()) { |
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for(;iter != end; iter++) |
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send(*iter, notify.c_str(), notify.size(), 0); |
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NotifyMutex.Unlock(); |
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break; |
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} else { |
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if (NotifyBufferMutex.Trylock()) { |
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for(;iter != end; iter++) |
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bufferedNotifies[*iter] += notify; |
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NotifyBufferMutex.Unlock(); |
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break; |
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} |
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} |
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} |
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SubscriptionMutex.Unlock(); |
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} |
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extern int GetLSCPCommand( void *buf, int max_size ) { |
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String command = LSCPServer::bufferedCommands[LSCPServer::currentSocket]; |
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if (command.size() == 0) { //Parser wants input but we have nothing. |
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strcpy((char*) buf, "\n"); //So give it an empty command |
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return 1; //to keep it happy. |
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} |
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if (max_size < command.size()) { |
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std::cerr << "getLSCPCommand: Flex buffer too small, ignoring the command." << std::endl; |
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return 0; //This will never happen |
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} |
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strcpy((char*) buf, command.c_str()); |
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LSCPServer::bufferedCommands.erase(LSCPServer::currentSocket); |
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return command.size(); |
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} |
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/** |
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* Will be called to try to read the command from the socket |
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* If command is read, it will return true. Otherwise false is returned. |
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* In any case the received portion (complete or incomplete) is saved into bufferedCommand map. |
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*/ |
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bool LSCPServer::GetLSCPCommand( std::vector<int>::iterator iter ) { |
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int socket = *iter; |
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char c; |
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int i = 0; |
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while (true) { |
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int result = recv(socket, (void *)&c, 1, 0); //Read one character at a time for now |
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if (result == 0) { //socket was selected, so 0 here means client has closed the connection |
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CloseConnection(iter); |
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break; |
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} |
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if (result == 1) { |
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if (c == '\r') |
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continue; //Ignore CR |
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if (c == '\n') { |
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bufferedCommands[socket] += "\n"; |
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return true; //Complete command was read |
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} |
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bufferedCommands[socket] += c; |
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} |
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if (result == -1) { |
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if (errno == EAGAIN) //Would block, try again later. |
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return false; |
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switch(errno) { |
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case EBADF: |
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dmsg(2,("LSCPScanner: The argument s is an invalid descriptor.\n")); |
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break; |
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case ECONNREFUSED: |
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dmsg(2,("LSCPScanner: A remote host refused to allow the network connection (typically because it is not running the requested service).\n")); |
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break; |
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case ENOTCONN: |
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dmsg(2,("LSCPScanner: The socket is associated with a connection-oriented protocol and has not been connected (see connect(2) and accept(2)).\n")); |
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break; |
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case ENOTSOCK: |
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dmsg(2,("LSCPScanner: The argument s does not refer to a socket.\n")); |
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break; |
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case EAGAIN: |
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dmsg(2,("LSCPScanner: The socket is marked non-blocking and the receive operation would block, or a receive timeout had been set and the timeout expired before data was received.\n")); |
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break; |
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case EINTR: |
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dmsg(2,("LSCPScanner: The receive was interrupted by delivery of a signal before any data were available.\n")); |
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break; |
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case EFAULT: |
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dmsg(2,("LSCPScanner: The receive buffer pointer(s) point outside the process's address space.\n")); |
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break; |
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case EINVAL: |
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dmsg(2,("LSCPScanner: Invalid argument passed.\n")); |
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break; |
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case ENOMEM: |
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dmsg(2,("LSCPScanner: Could not allocate memory for recvmsg.\n")); |
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break; |
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default: |
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dmsg(2,("LSCPScanner: Unknown recv() error.\n")); |
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break; |
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} |
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CloseConnection(iter); |
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break; |
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} |
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} |
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return false; |
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} |
} |
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/** |
/** |
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*/ |
*/ |
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void LSCPServer::AnswerClient(String ReturnMessage) { |
void LSCPServer::AnswerClient(String ReturnMessage) { |
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dmsg(2,("LSCPServer::AnswerClient(ReturnMessage=%s)", ReturnMessage.c_str())); |
dmsg(2,("LSCPServer::AnswerClient(ReturnMessage=%s)", ReturnMessage.c_str())); |
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send(hSession, ReturnMessage.c_str(), ReturnMessage.size(), 0); |
if (currentSocket != -1) { |
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NotifyMutex.Lock(); |
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send(currentSocket, ReturnMessage.c_str(), ReturnMessage.size(), 0); |
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NotifyMutex.Unlock(); |
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} |
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} |
} |
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/** |
/** |
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* Will be called by the parser to subscribe a client (frontend) on the |
* Will be called by the parser to subscribe a client (frontend) on the |
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* server for receiving event messages. |
* server for receiving event messages. |
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*/ |
*/ |
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String LSCPServer::SubscribeNotification(event_t Event) { |
String LSCPServer::SubscribeNotification(LSCPEvent::event_t type) { |
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dmsg(2,("LSCPServer: SubscribeNotification(Event=%d)\n", Event)); |
dmsg(2,("LSCPServer: SubscribeNotification(Event=%s)\n", LSCPEvent::Name(type).c_str())); |
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return "ERR:0:Not implemented yet.\r\n"; |
LSCPResultSet result; |
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SubscriptionMutex.Lock(); |
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eventSubscriptions[type].push_back(currentSocket); |
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SubscriptionMutex.Unlock(); |
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return result.Produce(); |
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} |
} |
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/** |
/** |
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* Will be called by the parser to unsubscribe a client on the server |
* Will be called by the parser to unsubscribe a client on the server |
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* for not receiving further event messages. |
* for not receiving further event messages. |
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*/ |
*/ |
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String LSCPServer::UnsubscribeNotification(event_t Event) { |
String LSCPServer::UnsubscribeNotification(LSCPEvent::event_t type) { |
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dmsg(2,("LSCPServer: UnsubscribeNotification(Event=%d)\n", Event)); |
dmsg(2,("LSCPServer: UnsubscribeNotification(Event=%s)\n", LSCPEvent::Name(type).c_str())); |
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return "ERR:0:Not implemented yet.\r\n"; |
LSCPResultSet result; |
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SubscriptionMutex.Lock(); |
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eventSubscriptions[type].remove(currentSocket); |
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SubscriptionMutex.Unlock(); |
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return result.Produce(); |
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} |
} |
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