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 bool notify_about_now_playing;
  38
  39 void ScrobbyErrorCallback(MPD::Connection *, int, string errormessage, void *)
  40 {
  41         ignore_newlines(errormessage);
  42         Log(llVerbose, "MPD: %s", errormessage.c_str());
  43 }
  44
  45 void ScrobbyStatusChanged(MPD::Connection *Mpd, MPD::StatusChanges changed, void *)
  46 {
  47         if (changed.State)
  48         {
  49                 old_state = current_state;
  50                 current_state = Mpd->GetState();
  51                 if (old_state == MPD::psStop && current_state == MPD::psPlay)
  52                         changed.SongID = 1;
  53         }
  54         if (changed.ElapsedTime)
  55         {
  56                 static int crossfade;
  57                 if (Mpd->GetElapsedTime() == ((crossfade = Mpd->GetCrossfade()) ? crossfade : 0 ))
  58                         changed.SongID = 1;
  59                 s.Playback++;
  60         }
  61         if (changed.SongID || (old_state == MPD::psPlay && current_state == MPD::psStop))
  62         {
  63                 s.Submit();
  64
  65                 // in this case allow entering only once
  66                 if (old_state == MPD::psPlay && current_state == MPD::psStop)
  67                         old_state = MPD::psUnknown;
  68
  69                 if (Mpd->GetElapsedTime() < Mpd->GetCrossfade()+10)
  70                         time(&s.StartTime);
  71
  72                 if (current_state == MPD::psPlay || current_state == MPD::psPause)
  73                 {
  74                         s.SetData(Mpd->CurrentSong());
  75                         notify_about_now_playing = s.Data && !s.isStream();
  76                 }
  77         }
  78         if (notify_about_now_playing)
  79         {
  80                 if (s.Data && (!s.Data->artist || !s.Data->title))
  81                 {
  82                         Log(llInfo, "Playing song with missing tags detected.");
  83                 }
  84                 else if (s.Data && s.Data->time <= 0)
  85                 {
  86                         Log(llInfo, "Playing song with unknown length detected.");
  87                 }
  88                 else if (s.Data && s.Data->artist && s.Data->title)
  89                 {
  90                         Log(llVerbose, "Playing song detected: %s - %s", s.Data->artist, s.Data->title);
  91
  92                         if (handshake.status == "OK" && !handshake.nowplaying_url.empty())
  93                         {
  94                                 Log(llInfo, "Sending now playing notification...");
  95                         }
  96                         else
  97                         {
  98                                 Log(llInfo, "Notification not sent due to problem with connection.");
  99                                 goto NOTIFICATION_FAILED;
 100                         }
 101
 102                         std::ostringstream postdata;
 103                         string result, postdata_str;
 104                         CURLcode code;
 105
 106                         char *c_artist = curl_easy_escape(0, s.Data->artist, 0);
 107                         char *c_title = curl_easy_escape(0, s.Data->title, 0);
 108                         char *c_album = s.Data->album ? curl_easy_escape(0, s.Data->album, 0) : NULL;
 109                         char *c_track = s.Data->track ? curl_easy_escape(0, s.Data->track, 0) : NULL;
 110
 111                         postdata
 112                         << "s=" << handshake.session_id
 113                         << "&a=" << c_artist
 114                         << "&t=" << c_title
 115                         << "&b=";
 116                         if (c_album)
 117                                 postdata << c_album;
 118                         postdata << "&l=" << s.Data->time
 119                         << "&n=";
 120                         if (c_track)
 121                                 postdata << c_track;
 122                         postdata << "&m=";
 123
 124                         curl_free(c_artist);
 125                         curl_free(c_title);
 126                         curl_free(c_album);
 127                         curl_free(c_track);
 128
 129                         postdata_str = postdata.str();
 130
 131                         Log(llVerbose, "URL: %s", handshake.nowplaying_url.c_str());
 132                         Log(llVerbose, "Post data: %s", postdata_str.c_str());
 133
 134                         CURL *np_notification = curl_easy_init();
 135                         curl_easy_setopt(np_notification, CURLOPT_URL, handshake.nowplaying_url.c_str());
 136                         curl_easy_setopt(np_notification, CURLOPT_POST, 1);
 137                         curl_easy_setopt(np_notification, CURLOPT_POSTFIELDS, postdata_str.c_str());
 138                         curl_easy_setopt(np_notification, CURLOPT_WRITEFUNCTION, write_data);
 139                         curl_easy_setopt(np_notification, CURLOPT_WRITEDATA, &result);
 140                         curl_easy_setopt(np_notification, CURLOPT_CONNECTTIMEOUT, curl_timeout);
 141                         code = curl_easy_perform(np_notification);
 142                         curl_easy_cleanup(np_notification);
 143
 144                         ignore_newlines(result);
 145
 146                         if (result == "OK")
 147                         {
 148                                 Log(llInfo, "Notification about currently playing song sent.");
 149                         }
 150                         else
 151                         {
 152                                 if (result.empty())
 153                                 {
 154                                         Log(llInfo, "Error while sending notification: %s", curl_easy_strerror(code));
 155                                 }
 156                                 else
 157                                 {
 158                                         Log(llInfo, "Audioscrobbler returned status %s", result.c_str());
 159                                 }
 160                                 goto NOTIFICATION_FAILED;
 161                         }
 162                 }
 163                 if (0)
 164                 {
 165                         NOTIFICATION_FAILED:
 166
 167                         handshake.Clear(); // handshake probably failed if we are here, so reset it
 168                         Log(llVerbose, "Handshake status reset");
 169                 }
 170                 notify_about_now_playing = 0;
 171         }
 172 }
 173