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(llVerbose, "MPD: %s", errormessage.c_str());
  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                 static int crossfade;
  60                 if (Mpd->GetElapsedTime() == ((crossfade = Mpd->GetCrossfade()) ? crossfade : 0 ))
  61                         changed.SongID = 1;
  62                 s.Playback()++;
  63         }
  64         if (changed.SongID || (old_state == MPD::psPlay && current_state == MPD::psStop))
  65         {
  66                 s.Submit();
  67
  68                 // in this case allow entering only once
  69                 if (old_state == MPD::psPlay && current_state == MPD::psStop)
  70                         old_state = MPD::psUnknown;
  71
  72                 if (Mpd->GetElapsedTime() < Mpd->GetCrossfade()+5)
  73                         s.SetStartTime();
  74
  75                 if (current_state == MPD::psPlay || current_state == MPD::psPause)
  76                 {
  77                         s.SetData(Mpd->CurrentSong());
  78                         notify_about_now_playing = s.Data() && !s.isStream();
  79                 }
  80         }
  81         if (notify_about_now_playing)
  82         {
  83                 pthread_mutex_lock(&handshake_lock);
  84                 if (s.Data() && (!s.Data()->artist || !s.Data()->title))
  85                 {
  86                         Log(llInfo, "Playing song with missing tags detected.");
  87                 }
  88                 else if (s.Data() && s.Data()->time <= 0)
  89                 {
  90                         Log(llInfo, "Playing song with unknown length detected.");
  91                 }
  92                 else if (s.Data() && s.Data()->artist && s.Data()->title)
  93                 {
  94                         Log(llVerbose, "Playing song detected: %s - %s", s.Data()->artist, s.Data()->title);
  95
  96                         if (handshake.status == "OK" && !handshake.nowplaying_url.empty())
  97                         {
  98                                 Log(llInfo, "Sending now playing notification...");
  99                         }
 100                         else
 101                         {
 102                                 Log(llInfo, "Notification not sent due to problem with connection.");
 103                                 goto NOTIFICATION_FAILED;
 104                         }
 105
 106                         string result, postdata;
 107                         CURLcode code;
 108
 109                         pthread_mutex_lock(&curl_lock);
 110                         CURL *np_notification = curl_easy_init();
 111
 112                         char *c_artist = curl_easy_escape(np_notification, s.Data()->artist, 0);
 113                         char *c_title = curl_easy_escape(np_notification, s.Data()->title, 0);
 114                         char *c_album = s.Data()->album ? curl_easy_escape(np_notification, s.Data()->album, 0) : NULL;
 115                         char *c_track = s.Data()->track ? curl_easy_escape(np_notification, s.Data()->track, 0) : NULL;
 116
 117                         postdata = "s=";
 118                         postdata += handshake.session_id;
 119                         postdata += "&a=";
 120                         postdata += c_artist;
 121                         postdata += "&t=";
 122                         postdata += c_title;
 123                         postdata += "&b=";
 124                         if (c_album)
 125                                 postdata += c_album;
 126                         postdata += "&l=";
 127                         postdata += IntoStr(s.Data()->time);
 128                         postdata += "&n=";
 129                         if (c_track)
 130                                 postdata += c_track;
 131                         postdata += "&m=";
 132
 133                         curl_free(c_artist);
 134                         curl_free(c_title);
 135                         curl_free(c_album);
 136                         curl_free(c_track);
 137
 138                         Log(llVerbose, "URL: %s", handshake.nowplaying_url.c_str());
 139                         Log(llVerbose, "Post data: %s", postdata.c_str());
 140
 141                         curl_easy_setopt(np_notification, CURLOPT_URL, handshake.nowplaying_url.c_str());
 142                         curl_easy_setopt(np_notification, CURLOPT_POST, 1);
 143                         curl_easy_setopt(np_notification, CURLOPT_POSTFIELDS, postdata.c_str());
 144                         curl_easy_setopt(np_notification, CURLOPT_WRITEFUNCTION, write_data);
 145                         curl_easy_setopt(np_notification, CURLOPT_WRITEDATA, &result);
 146                         curl_easy_setopt(np_notification, CURLOPT_CONNECTTIMEOUT, curl_timeout);
 147                         code = curl_easy_perform(np_notification);
 148                         curl_easy_cleanup(np_notification);
 149                         pthread_mutex_unlock(&curl_lock);
 150
 151                         ignore_newlines(result);
 152
 153                         if (result == "OK")
 154                         {
 155                                 Log(llInfo, "Notification about currently playing song sent.");
 156                         }
 157                         else
 158                         {
 159                                 if (result.empty())
 160                                 {
 161                                         Log(llInfo, "Error while sending notification: %s", curl_easy_strerror(code));
 162                                 }
 163                                 else
 164                                 {
 165                                         Log(llInfo, "Audioscrobbler returned status %s", result.c_str());
 166                                 }
 167                                 goto NOTIFICATION_FAILED;
 168                         }
 169                 }
 170                 if (0)
 171                 {
 172                         NOTIFICATION_FAILED:
 173
 174                         handshake.Clear(); // handshake probably failed if we are here, so reset it
 175                         Log(llVerbose, "Handshake status reset");
 176                 }
 177                 pthread_mutex_unlock(&handshake_lock);
 178                 notify_about_now_playing = 0;
 179         }
 180 }
 181