src/callback.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2008 by Andrzej Rybczak   *
   3  *   electricityispower@gmail.com   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20
  21 #include <curl/curl.h>
  22 #include <cstring>
  23
  24 #include "callback.h"
  25 #include "misc.h"
  26 #include "scrobby.h"
  27 #include "song.h"
  28
  29 using std::string;
  30
  31 MPD::State old_state = MPD::psUnknown;
  32 MPD::State current_state = MPD::psUnknown;
  33
  34 extern Handshake handshake;
  35 extern MPD::Song s;
  36
  37 extern pthread_mutex_t curl_lock;
  38 extern pthread_mutex_t handshake_lock;
  39
  40 extern bool notify_about_now_playing;
  41
  42 void ScrobbyErrorCallback(MPD::Connection *, int, string errormessage, void *)
  43 {
  44         ignore_newlines(errormessage);
  45         Log("MPD: " + errormessage, llVerbose);
  46 }
  47
  48 void ScrobbyStatusChanged(MPD::Connection *Mpd, MPD::StatusChanges changed, void *)
  49 {
  50         if (changed.State)
  51         {
  52                 old_state = current_state;
  53                 current_state = Mpd->GetState();
  54                 if (old_state == MPD::psStop && current_state == MPD::psPlay)
  55                         changed.SongID = 1;
  56         }
  57         if (changed.ElapsedTime)
  58         {
  59                 if (!Mpd->GetElapsedTime())
  60                         changed.SongID = 1;
  61                 s.Playback()++;
  62         }
  63         if (changed.SongID || (old_state == MPD::psPlay && current_state == MPD::psStop))
  64         {
  65                 s.Submit();
  66
  67                 // in this case allow entering only once
  68                 if (old_state == MPD::psPlay && current_state == MPD::psStop)
  69                         old_state = MPD::psUnknown;
  70
  71                 if (Mpd->GetElapsedTime() < 5)
  72                         s.SetStartTime();
  73
  74                 if (current_state == MPD::psPlay || current_state == MPD::psPause)
  75                 {
  76                         do
  77                                 s.SetData(Mpd->CurrentSong());
  78                         while (!s.Data());
  79                         notify_about_now_playing = !s.isStream();
  80                 }
  81         }
  82         if (notify_about_now_playing)
  83         {
  84                 pthread_mutex_lock(&handshake_lock);
  85                 if (s.Data() && (!s.Data()->artist || !s.Data()->title))
  86                 {
  87                         Log("Playing song with missing tags detected.", llInfo);
  88                 }
  89                 else if (s.Data() && s.Data()->time <= 0)
  90                 {
  91                         Log("Playing song with unknown length detected.", llInfo);
  92                 }
  93                 else if (s.Data() && s.Data()->artist && s.Data()->title)
  94                 {
  95                         Log("Playing song detected: " + string(s.Data()->artist) + " - " + string(s.Data()->title), llVerbose);
  96
  97                         if (handshake.status == "OK" && !handshake.nowplaying_url.empty())
  98                         {
  99                                 Log("Sending now playing notification...", llInfo);
 100                         }
 101                         else
 102                         {
 103                                 Log("Notification not sent due to problem with connection.", llInfo);
 104                                 goto NOTIFICATION_FAILED;
 105                         }
 106
 107                         string result, postdata;
 108                         CURLcode code;
 109
 110                         pthread_mutex_lock(&curl_lock);
 111                         CURL *np_notification = curl_easy_init();
 112
 113                         char *c_artist = curl_easy_escape(np_notification, s.Data()->artist, 0);
 114                         char *c_title = curl_easy_escape(np_notification, s.Data()->title, 0);
 115                         char *c_album = s.Data()->album ? curl_easy_escape(np_notification, s.Data()->album, 0) : NULL;
 116                         char *c_track = s.Data()->track ? curl_easy_escape(np_notification, s.Data()->track, 0) : NULL;
 117
 118                         postdata = "s=";
 119                         postdata += handshake.session_id;
 120                         postdata += "&a=";
 121                         postdata += c_artist;
 122                         postdata += "&t=";
 123                         postdata += c_title;
 124                         postdata += "&b=";
 125                         if (c_album)
 126                                 postdata += c_album;
 127                         postdata += "&l=";
 128                         postdata += IntoStr(s.Data()->time);
 129                         postdata += "&n=";
 130                         if (c_track)
 131                                 postdata += c_track;
 132                         postdata += "&m=";
 133
 134                         curl_free(c_artist);
 135                         curl_free(c_title);
 136                         curl_free(c_album);
 137                         curl_free(c_track);
 138
 139                         Log("URL: " + handshake.nowplaying_url, llVerbose);
 140                         Log("Post data: " + postdata, llVerbose);
 141
 142                         curl_easy_setopt(np_notification, CURLOPT_URL, handshake.nowplaying_url.c_str());
 143                         curl_easy_setopt(np_notification, CURLOPT_POST, 1);
 144                         curl_easy_setopt(np_notification, CURLOPT_POSTFIELDS, postdata.c_str());
 145                         curl_easy_setopt(np_notification, CURLOPT_WRITEFUNCTION, write_data);
 146                         curl_easy_setopt(np_notification, CURLOPT_WRITEDATA, &result);
 147                         curl_easy_setopt(np_notification, CURLOPT_CONNECTTIMEOUT, curl_timeout);
 148                         code = curl_easy_perform(np_notification);
 149                         curl_easy_cleanup(np_notification);
 150                         pthread_mutex_unlock(&curl_lock);
 151
 152                         ignore_newlines(result);
 153
 154                         if (result == "OK")
 155                         {
 156                                 Log("Notification about currently playing song sent.", llInfo);
 157                         }
 158                         else
 159                         {
 160                                 if (result.empty())
 161                                 {
 162                                         Log("Error while sending notification: " + string(curl_easy_strerror(code)), llInfo);
 163                                 }
 164                                 else
 165                                 {
 166                                         Log("Audioscrobbler returned status " + result, llInfo);
 167                                 }
 168                                 goto NOTIFICATION_FAILED;
 169                         }
 170                 }
 171                 if (0)
 172                 {
 173                         NOTIFICATION_FAILED:
 174
 175                         handshake.Clear(); // handshake probably failed if we are here, so reset it
 176                         Log("Handshake status reset", llVerbose);
 177                 }
 178                 pthread_mutex_unlock(&handshake_lock);
 179                 notify_about_now_playing = 0;
 180         }
 181 }
 182