Do not check the return value of para_printf().
[paraslash.git] / playlist.c
1 /*
2 * Copyright (C) 2007 Andre Noll <maan@tuebingen.mpg.de>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 #include <regex.h>
8 #include <osl.h>
9
10 #include "para.h"
11 #include "error.h"
12 #include "string.h"
13 #include "afh.h"
14 #include "afs.h"
15 #include "ipc.h"
16 #include "sideband.h"
17
18 /** \file playlist.c Functions for loading and saving playlists. */
19
20 /** Structure used for adding entries to a playlist. */
21 struct playlist_info {
22 /** The name of the playlist. */
23 char *name;
24 /** The number of entries currently in the playlist. */
25 unsigned length;
26 };
27 static struct playlist_info current_playlist;
28
29 /**
30 * Re-insert an audio file into the tree of admissible files.
31 *
32 * \param aft_row Determines the audio file.
33 *
34 * \return The return value of score_update().
35 */
36 static int playlist_update_audio_file(const struct osl_row *aft_row)
37 {
38 /* always re-insert to the top of the tree */
39 return score_update(aft_row, 0);
40 }
41
42 static int add_playlist_entry(char *path, void *data)
43 {
44 struct playlist_info *playlist = data;
45 struct osl_row *aft_row;
46 int ret = aft_get_row_of_path(path, &aft_row);
47
48 if (ret < 0) {
49 PARA_NOTICE_LOG("%s: %s\n", path, para_strerror(-ret));
50 return 1;
51 }
52 ret = score_add(aft_row, -playlist->length);
53 if (ret < 0) {
54 PARA_ERROR_LOG("failed to add %s: %s\n", path, para_strerror(-ret));
55 return ret;
56 }
57 playlist->length++;
58 return 1;
59 }
60
61 /* returns -E_PLAYLIST_LOADED on _success_ to terminate the loop */
62 static int load_playlist(struct osl_row *row, void *data)
63 {
64 struct playlist_info *playlist = data;
65 struct osl_object playlist_def;
66 char *playlist_name;
67 int ret;
68
69 ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
70 if (ret < 0)
71 goto err;
72 playlist->length = 0;
73 ret = for_each_line(FELF_READ_ONLY, playlist_def.data,
74 playlist_def.size, add_playlist_entry, playlist);
75 osl_close_disk_object(&playlist_def);
76 if (ret < 0)
77 goto err;
78 ret = -E_PLAYLIST_EMPTY;
79 if (!playlist->length)
80 goto err;
81 playlist->name = para_strdup(playlist_name);
82 PARA_NOTICE_LOG("loaded playlist %s (%u files)\n", playlist->name,
83 playlist->length);
84 return -E_PLAYLIST_LOADED;
85 err:
86 if (ret != -E_DUMMY_ROW)
87 PARA_NOTICE_LOG("unable to load playlist (%s)\n",
88 para_strerror(-ret));
89 return 1;
90 }
91
92 static int check_playlist_path(char *path, void *data)
93 {
94 struct para_buffer *pb = data;
95 struct osl_row *aft_row;
96 int ret = aft_get_row_of_path(path, &aft_row);
97
98 if (ret < 0)
99 para_printf(pb, "%s: %s\n", path, para_strerror(-ret));
100 return 1; /* do not fail the loop on bad paths */
101 }
102
103 static int check_playlist(struct osl_row *row, void *data)
104 {
105 struct para_buffer *pb = data;
106 struct osl_object playlist_def;
107 char *playlist_name;
108 int ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
109
110 if (ret < 0) { /* log error, but continue */
111 para_printf(pb, "failed to get playlist data: %s\n",
112 para_strerror(-ret));
113 return 1;
114 }
115 if (*playlist_name) { /* skip dummy row */
116 para_printf(pb, "checking playlist %s...\n", playlist_name);
117 for_each_line(FELF_READ_ONLY, playlist_def.data,
118 playlist_def.size, check_playlist_path, pb);
119 }
120 osl_close_disk_object(&playlist_def);
121 return 1;
122 }
123
124 /**
125 * Check the playlist table for inconsistencies.
126 *
127 * \param fd The afs socket.
128 * \param query Unused.
129 */
130 void playlist_check_callback(int fd, __a_unused const struct osl_object *query)
131 {
132 struct para_buffer pb = {
133 .max_size = shm_get_shmmax(),
134 .private_data = &(struct afs_max_size_handler_data) {
135 .fd = fd,
136 .band = SBD_OUTPUT
137 },
138 .max_size_handler = afs_max_size_handler,
139 };
140 para_printf(&pb, "checking playlists...\n");
141 osl_rbtree_loop(playlists_table, BLOBCOL_ID, &pb,
142 check_playlist);
143 if (pb.offset)
144 pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
145 free(pb.buf);
146 }
147
148 /**
149 * Close the current playlist.
150 *
151 * \sa playlist_open().
152 */
153 void playlist_close(void)
154 {
155 if (!current_playlist.name)
156 return;
157 free(current_playlist.name);
158 current_playlist.name = NULL;
159 }
160
161 /**
162 * Open the given playlist.
163 *
164 * \param name The name of the playlist to open.
165 *
166 * Files which are listed in the playlist, but not contained in the database
167 * are ignored. This is not considered an error.
168 *
169 * \return Standard.
170 */
171 int playlist_open(char *name)
172 {
173 struct osl_object obj;
174 int ret;
175 struct osl_row *row;
176
177 obj.data = name;
178 obj.size = strlen(obj.data);
179 ret = osl(osl_get_row(playlists_table, BLOBCOL_NAME, &obj, &row));
180 if (ret < 0) {
181 PARA_NOTICE_LOG("failed to load playlist %s\n", name);
182 return ret;
183 }
184 playlist_close();
185 ret = load_playlist(row, &current_playlist);
186 return (ret == -E_PLAYLIST_LOADED)? current_playlist.length : ret;
187 }
188
189 static int search_path(char *path, void *data)
190 {
191 if (strcmp(path, data))
192 return 1;
193 return -E_PATH_FOUND;
194 }
195
196 static int handle_audio_file_event(enum afs_events event, void *data)
197 {
198 int ret, was_admissible = 0, is_admissible;
199 struct osl_object playlist_def;
200 char *new_path;
201 const struct osl_row *row = data;
202
203 if (!current_playlist.name)
204 return 1;
205 if (event == AUDIO_FILE_RENAME) {
206 ret = row_belongs_to_score_table(row, NULL);
207 if (ret < 0)
208 return ret;
209 was_admissible = ret;
210 }
211 ret = get_audio_file_path_of_row(row, &new_path);
212 if (ret < 0)
213 return ret;
214 ret = pl_get_def_by_name(current_playlist.name, &playlist_def);
215 if (ret < 0)
216 return ret;
217 ret = for_each_line(FELF_READ_ONLY, playlist_def.data,
218 playlist_def.size, search_path, new_path);
219 osl_close_disk_object(&playlist_def);
220 is_admissible = (ret < 0);
221 if (was_admissible && is_admissible)
222 return 1;
223 if (!was_admissible && !is_admissible)
224 return 1;
225 if (was_admissible && !is_admissible) {
226 current_playlist.length--;
227 return score_delete(row);
228 }
229 /* !was_admissible && is_admissible */
230 current_playlist.length++;
231 return score_add(row, 0); /* play it immediately */
232 }
233
234 /**
235 * Handle afs events relevant to playlists.
236 *
237 * \param event The event type.
238 * \param pb Unused.
239 * \param data Depends on the event type.
240 *
241 * \return Standard.
242 */
243 int playlists_event_handler(enum afs_events event,
244 __a_unused struct para_buffer *pb, void *data)
245 {
246 int ret;
247 struct afsi_change_event_data *aced = data;
248
249 switch(event) {
250 case AFSI_CHANGE:
251 return playlist_update_audio_file(aced->aft_row);
252 case AUDIO_FILE_RENAME:
253 case AUDIO_FILE_ADD:
254 return handle_audio_file_event(event, data);
255 case AUDIO_FILE_REMOVE:
256 ret = row_belongs_to_score_table(data, NULL);
257 if (ret < 0)
258 return ret;
259 if (!ret)
260 return 1;
261 current_playlist.length--;
262 return score_delete(data);
263 default:
264 return 1;
265 }
266 }