/[svn]/linuxsampler/trunk/src/network/lscpserver.cpp
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revision 159 by capela, Tue Jun 29 21:11:50 2004 UTC revision 170 by senkov, Sat Jul 3 20:08:07 2004 UTC
# Line 22  Line 22 
22    
23  #include "lscpserver.h"  #include "lscpserver.h"
24  #include "lscpresultset.h"  #include "lscpresultset.h"
25    #include "lscpevent.h"
26    
27  #include "../engines/gig/Engine.h"  #include "../engines/gig/Engine.h"
28  #include "../audiodriver/AudioOutputDeviceFactory.h"  #include "../audiodriver/AudioOutputDeviceFactory.h"
29  #include "../mididriver/MidiInputDeviceFactory.h"  #include "../mididriver/MidiInputDeviceFactory.h"
30    
31    /**
32     * Below are a few static members of the LSCPServer class.
33     * The big assumption here is that LSCPServer is going to remain a singleton.
34     * These members are used to support client connections.
35     * Class handles multiple connections at the same time using select() and non-blocking recv()
36     * Commands are processed by a single LSCPServer thread.
37     * Notifications are delivered either by the thread that originated them
38     * or (if the resultset is currently in progress) by the LSCPServer thread
39     * after the resultset was sent out.
40     * This makes sure that resultsets can not be interrupted by notifications.
41     * This also makes sure that the thread sending notification is not blocked
42     * by the LSCPServer thread.
43     */
44    fd_set LSCPServer::fdSet;
45    int LSCPServer::currentSocket = -1;
46    std::vector<int> LSCPServer::hSessions = std::vector<int>();
47    std::map<int,String> LSCPServer::bufferedNotifies = std::map<int,String>();
48    std::map<int,String> LSCPServer::bufferedCommands = std::map<int,String>();
49    std::map< LSCPEvent::event_t, std::list<int> > LSCPServer::eventSubscriptions = std::map< LSCPEvent::event_t, std::list<int> >();
50    Mutex LSCPServer::NotifyMutex = Mutex();
51    Mutex LSCPServer::NotifyBufferMutex = Mutex();
52    Mutex LSCPServer::SubscriptionMutex = Mutex();
53    
54  LSCPServer::LSCPServer(Sampler* pSampler) : Thread(false, 0, -4) {  LSCPServer::LSCPServer(Sampler* pSampler) : Thread(false, 0, -4) {
55      this->pSampler = pSampler;      this->pSampler = pSampler;
56        LSCPEvent::RegisterEvent(LSCPEvent::event_channels, "CHANNELS");
57        LSCPEvent::RegisterEvent(LSCPEvent::event_voice_count, "VOICE_COUNT");
58        LSCPEvent::RegisterEvent(LSCPEvent::event_stream_count, "STREAM_COUNT");
59        LSCPEvent::RegisterEvent(LSCPEvent::event_buffer_fill, "BUFFER_FILL");
60        LSCPEvent::RegisterEvent(LSCPEvent::event_info, "INFO");
61        LSCPEvent::RegisterEvent(LSCPEvent::event_misc, "MISCELLANEOUS");
62  }  }
63    
64  int LSCPServer::Main() {  int LSCPServer::Main() {
65      hSocket = socket(AF_INET, SOCK_STREAM, 0);      int hSocket = socket(AF_INET, SOCK_STREAM, 0);
66      if (hSocket < 0) {      if (hSocket < 0) {
67          std::cerr << "LSCPServer: Could not create server socket." << std::endl;          std::cerr << "LSCPServer: Could not create server socket." << std::endl;
68          //return -1;          //return -1;
# Line 56  int LSCPServer::Main() { Line 86  int LSCPServer::Main() {
86      // now wait for client connections and handle their requests      // now wait for client connections and handle their requests
87      sockaddr_in client;      sockaddr_in client;
88      int length = sizeof(client);      int length = sizeof(client);
89        struct timeval tv;
90        tv.tv_sec = 30;
91        tv.tv_usec = 0;
92        FD_ZERO(&fdSet);
93        FD_SET(hSocket, &fdSet);
94        int maxSessions = hSocket;
95    
96        // Parser initialization
97        yyparse_param_t yyparse_param;
98        yyparse_param.pServer = this;
99    
100      while (true) {      while (true) {
101          hSession = accept(hSocket, (sockaddr*) &client, (socklen_t*) &length);          fd_set selectSet = fdSet;
102          if (hSession < 0) {          int retval = select(maxSessions+1, &selectSet, NULL, NULL, &tv);
103              std::cerr << "LSCPServer: Client connection failed." << std::endl;          if (retval == 0)
104              close(hSocket);                  continue; //Nothing in 30 seconds, try again
105              //return -1;          if (retval == -1) {
106              exit(EXIT_FAILURE);                  std::cerr << "LSCPServer: Socket select error." << std::endl;
107          }                  close(hSocket);
108                    exit(EXIT_FAILURE);
109          dmsg(1,("LSCPServer: Client connection established.\n"));          }
110          //send(hSession, "Welcome!\r\n", 10, 0);          
111            //Accept new connections now (if any)
112          // Parser invocation          if (FD_ISSET(hSocket, &selectSet)) {
113          yyparse_param_t yyparse_param;                  int socket = accept(hSocket, (sockaddr*) &client, (socklen_t*) &length);
114          yyparse_param.pServer = this;                  if (socket < 0) {
115          yylex_init(&yyparse_param.pScanner);                          std::cerr << "LSCPServer: Client connection failed." << std::endl;
116          while (yyparse(&yyparse_param) == LSCP_SYNTAX_ERROR); // recall parser in case of syntax error                          exit(EXIT_FAILURE);
117          yylex_destroy(yyparse_param.pScanner);                  }
118    
119                    if (fcntl(socket, F_SETFL, O_NONBLOCK)) {
120                            std::cerr << "LSCPServer: F_SETFL O_NONBLOCK failed." << std::endl;
121                            exit(EXIT_FAILURE);
122                    }
123    
124                    hSessions.push_back(socket);
125                    FD_SET(socket, &fdSet);
126                    if (socket > maxSessions)
127                            maxSessions = socket;
128                    dmsg(1,("LSCPServer: Client connection established on socket:%d.\n", socket));
129                    LSCPServer::SendLSCPNotify(LSCPEvent(LSCPEvent::event_misc, "Client connection established on socket", socket));
130                    continue; //Maybe this was the only selected socket, better select again
131            }
132    
133            //Something was selected and it was not the hSocket, so it must be some command(s) coming.
134            for (std::vector<int>::iterator iter = hSessions.begin(); iter !=  hSessions.end(); iter++) {
135                    if (FD_ISSET(*iter, &selectSet)) {      //Was it this socket?
136                            if (GetLSCPCommand(iter)) {     //Have we read the entire command?
137                                    dmsg(3,("LSCPServer: Got command on socket %d, calling parser.\n", currentSocket));
138                                    yylex_init(&yyparse_param.pScanner);
139                                    currentSocket = *iter;  //a hack
140                                    int result = yyparse(&yyparse_param);
141                                    currentSocket = -1;     //continuation of a hack
142                                    dmsg(3,("LSCPServer: Done parsing on socket %d.\n", currentSocket));
143                                    if (result == LSCP_QUIT) { //Was it a quit command by any chance?
144                                            CloseConnection(iter);
145                                    }
146                            }
147                            //socket may have been closed, iter may be invalid, get out of the loop for now.
148                            //we'll be back if there is data.
149                            break;
150                    }
151            }
152    
153          close(hSession);          //Now let's deliver late notifies (if any)
154          dmsg(1,("LSCPServer: Client connection terminated.\n"));          NotifyBufferMutex.Lock();
155            for (std::map<int,String>::iterator iterNotify = bufferedNotifies.begin(); iterNotify != bufferedNotifies.end(); iterNotify++) {
156                    send(iterNotify->first, iterNotify->second.c_str(), iterNotify->second.size(), 0);
157                    bufferedNotifies.erase(iterNotify);
158            }
159            NotifyBufferMutex.Unlock();
160      }      }
161        //It will never get here anyway
162        //yylex_destroy(yyparse_param.pScanner);
163    }
164    
165    void LSCPServer::CloseConnection( std::vector<int>::iterator iter ) {
166            int socket = *iter;
167            dmsg(1,("LSCPServer: Client connection terminated on socket:%d.\n",socket));
168            LSCPServer::SendLSCPNotify(LSCPEvent(LSCPEvent::event_misc, "Client connection terminated on socket", socket));
169            hSessions.erase(iter);
170            FD_CLR(socket,  &fdSet);
171            SubscriptionMutex.Lock(); //Must unsubscribe this socket from all events (if any)
172            for (std::map< LSCPEvent::event_t, std::list<int> >::iterator iter = eventSubscriptions.begin(); iter != eventSubscriptions.end(); iter++) {
173                    iter->second.remove(socket);
174            }
175            SubscriptionMutex.Unlock();
176            NotifyMutex.Lock();
177            bufferedCommands.erase(socket);
178            bufferedNotifies.erase(socket);
179            close(socket);
180            NotifyMutex.Unlock();
181    }
182    
183    void LSCPServer::SendLSCPNotify( LSCPEvent event ) {
184            SubscriptionMutex.Lock();
185            if (eventSubscriptions.count(event.GetType()) == 0) {
186                    SubscriptionMutex.Unlock();     //Nobody is subscribed to this event
187                    return;
188            }
189            std::list<int>::iterator iter = eventSubscriptions[event.GetType()].begin();
190            std::list<int>::iterator end = eventSubscriptions[event.GetType()].end();
191            String notify = event.Produce();
192    
193            while (true) {
194                    if (NotifyMutex.Trylock()) {
195                            for(;iter != end; iter++)
196                                    send(*iter, notify.c_str(), notify.size(), 0);
197                            NotifyMutex.Unlock();
198                            break;
199                    } else {
200                            if (NotifyBufferMutex.Trylock()) {
201                                    for(;iter != end; iter++)
202                                            bufferedNotifies[*iter] += notify;
203                                    NotifyBufferMutex.Unlock();
204                                    break;
205                            }
206                    }
207            }
208            SubscriptionMutex.Unlock();
209    }
210    
211    extern int GetLSCPCommand( void *buf, int max_size ) {
212            String command = LSCPServer::bufferedCommands[LSCPServer::currentSocket];
213            if (command.size() == 0) {              //Parser wants input but we have nothing.
214                    strcpy((char*) buf, "\n");      //So give it an empty command
215                    return 1;                       //to keep it happy.
216            }
217    
218            if (max_size < command.size()) {
219                    std::cerr << "getLSCPCommand: Flex buffer too small, ignoring the command." << std::endl;
220                    return 0;       //This will never happen
221            }
222    
223            strcpy((char*) buf, command.c_str());
224            LSCPServer::bufferedCommands.erase(LSCPServer::currentSocket);
225            return command.size();
226    }
227    
228    /**
229     * Will be called to try to read the command from the socket
230     * If command is read, it will return true. Otherwise false is returned.
231     * In any case the received portion (complete or incomplete) is saved into bufferedCommand map.
232     */
233    bool LSCPServer::GetLSCPCommand( std::vector<int>::iterator iter ) {
234            int socket = *iter;
235            char c;
236            int i = 0;
237            while (true) {
238                    int result = recv(socket, (void *)&c, 1, 0); //Read one character at a time for now
239                    if (result == 0) { //socket was selected, so 0 here means client has closed the connection
240                            CloseConnection(iter);
241                            break;
242                    }
243                    if (result == 1) {
244                            if (c == '\r')
245                                    continue; //Ignore CR
246                            if (c == '\n') {
247                                    bufferedCommands[socket] += "\n";
248                                    return true; //Complete command was read
249                            }
250                            bufferedCommands[socket] += c;
251                    }
252                    if (result == -1) {
253                            if (errno == EAGAIN) //Would block, try again later.
254                                    return false;
255                            switch(errno) {
256                                    case EBADF:
257                                            dmsg(2,("LSCPScanner: The argument s is an invalid descriptor.\n"));
258                                            break;
259                                    case ECONNREFUSED:
260                                            dmsg(2,("LSCPScanner: A remote host refused to allow the network connection (typically because it is not running the requested service).\n"));
261                                            break;
262                                    case ENOTCONN:
263                                            dmsg(2,("LSCPScanner: The socket is associated with a connection-oriented protocol and has not been connected (see connect(2) and accept(2)).\n"));
264                                            break;
265                                    case ENOTSOCK:
266                                            dmsg(2,("LSCPScanner: The argument s does not refer to a socket.\n"));
267                                            break;
268                                    case EAGAIN:
269                                            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"));
270                                            break;
271                                    case EINTR:
272                                            dmsg(2,("LSCPScanner: The receive was interrupted by delivery of a signal before any data were available.\n"));
273                                            break;
274                                    case EFAULT:
275                                            dmsg(2,("LSCPScanner: The receive buffer pointer(s) point outside the process's address space.\n"));
276                                            break;
277                                    case EINVAL:
278                                            dmsg(2,("LSCPScanner: Invalid argument passed.\n"));
279                                            break;
280                                    case ENOMEM:
281                                            dmsg(2,("LSCPScanner: Could not allocate memory for recvmsg.\n"));
282                                            break;
283                                    default:
284                                            dmsg(2,("LSCPScanner: Unknown recv() error.\n"));
285                                            break;
286                            }
287                            CloseConnection(iter);
288                            break;
289                    }
290            }
291            return false;
292  }  }
293    
294  /**  /**
# Line 88  int LSCPServer::Main() { Line 299  int LSCPServer::Main() {
299   */   */
300  void LSCPServer::AnswerClient(String ReturnMessage) {  void LSCPServer::AnswerClient(String ReturnMessage) {
301      dmsg(2,("LSCPServer::AnswerClient(ReturnMessage=%s)", ReturnMessage.c_str()));      dmsg(2,("LSCPServer::AnswerClient(ReturnMessage=%s)", ReturnMessage.c_str()));
302      send(hSession, ReturnMessage.c_str(), ReturnMessage.size(), 0);      if (currentSocket != -1) {
303                NotifyMutex.Lock();
304                send(currentSocket, ReturnMessage.c_str(), ReturnMessage.size(), 0);
305                NotifyMutex.Unlock();
306        }
307  }  }
308    
309  /**  /**
# Line 1005  String LSCPServer::ResetChannel(uint uiS Line 1220  String LSCPServer::ResetChannel(uint uiS
1220   * 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
1221   * server for receiving event messages.   * server for receiving event messages.
1222   */   */
1223  String LSCPServer::SubscribeNotification(event_t Event) {  String LSCPServer::SubscribeNotification(LSCPEvent::event_t type) {
1224      dmsg(2,("LSCPServer: SubscribeNotification(Event=%d)\n", Event));      dmsg(2,("LSCPServer: SubscribeNotification(Event=%s)\n", LSCPEvent::Name(type).c_str()));
1225      return "ERR:0:Not implemented yet.\r\n";      LSCPResultSet result;
1226        SubscriptionMutex.Lock();
1227        eventSubscriptions[type].push_back(currentSocket);
1228        SubscriptionMutex.Unlock();
1229        return result.Produce();
1230  }  }
1231    
1232  /**  /**
1233   * 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
1234   * for not receiving further event messages.   * for not receiving further event messages.
1235   */   */
1236  String LSCPServer::UnsubscribeNotification(event_t Event) {  String LSCPServer::UnsubscribeNotification(LSCPEvent::event_t type) {
1237      dmsg(2,("LSCPServer: UnsubscribeNotification(Event=%d)\n", Event));      dmsg(2,("LSCPServer: UnsubscribeNotification(Event=%s)\n", LSCPEvent::Name(type).c_str()));
1238      return "ERR:0:Not implemented yet.\r\n";      LSCPResultSet result;
1239        SubscriptionMutex.Lock();
1240        eventSubscriptions[type].remove(currentSocket);
1241        SubscriptionMutex.Unlock();
1242        return result.Produce();
1243  }  }
1244    
1245    

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