Let afs callbacks return an error code.
[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 * \return Currently this function always returns zero.
131 */
132 int playlist_check_callback(int fd, __a_unused const struct osl_object *query)
133 {
134 struct para_buffer pb = {
135 .max_size = shm_get_shmmax(),
136 .private_data = &(struct afs_max_size_handler_data) {
137 .fd = fd,
138 .band = SBD_OUTPUT
139 },
140 .max_size_handler = afs_max_size_handler,
141 };
142 para_printf(&pb, "checking playlists...\n");
143 osl_rbtree_loop(playlists_table, BLOBCOL_ID, &pb,
144 check_playlist);
145 flush_and_free_pb(&pb);
146 return 0;
147 }
148
149 /**
150 * Close the current playlist.
151 *
152 * \sa playlist_open().
153 */
154 void playlist_close(void)
155 {
156 if (!current_playlist.name)
157 return;
158 free(current_playlist.name);
159 current_playlist.name = NULL;
160 }
161
162 /**
163 * Open the given playlist.
164 *
165 * \param name The name of the playlist to open.
166 *
167 * Files which are listed in the playlist, but not contained in the database
168 * are ignored. This is not considered an error.
169 *
170 * \return Standard.
171 */
172 int playlist_open(char *name)
173 {
174 struct osl_object obj;
175 int ret;
176 struct osl_row *row;
177
178 obj.data = name;
179 obj.size = strlen(obj.data);
180 ret = osl(osl_get_row(playlists_table, BLOBCOL_NAME, &obj, &row));
181 if (ret < 0) {
182 PARA_NOTICE_LOG("failed to load playlist %s\n", name);
183 return ret;
184 }
185 playlist_close();
186 ret = load_playlist(row, &current_playlist);
187 return (ret == -E_PLAYLIST_LOADED)? current_playlist.length : ret;
188 }
189
190 static int search_path(char *path, void *data)
191 {
192 if (strcmp(path, data))
193 return 1;
194 return -E_PATH_FOUND;
195 }
196
197 static int handle_audio_file_event(enum afs_events event, void *data)
198 {
199 int ret, was_admissible = 0, is_admissible;
200 struct osl_object playlist_def;
201 char *new_path;
202 const struct osl_row *row = data;
203
204 if (!current_playlist.name)
205 return 1;
206 if (event == AUDIO_FILE_RENAME) {
207 ret = row_belongs_to_score_table(row, NULL);
208 if (ret < 0)
209 return ret;
210 was_admissible = ret;
211 }
212 ret = get_audio_file_path_of_row(row, &new_path);
213 if (ret < 0)
214 return ret;
215 ret = pl_get_def_by_name(current_playlist.name, &playlist_def);
216 if (ret < 0)
217 return ret;
218 ret = for_each_line(FELF_READ_ONLY, playlist_def.data,
219 playlist_def.size, search_path, new_path);
220 osl_close_disk_object(&playlist_def);
221 is_admissible = (ret < 0);
222 if (was_admissible && is_admissible)
223 return 1;
224 if (!was_admissible && !is_admissible)
225 return 1;
226 if (was_admissible && !is_admissible) {
227 current_playlist.length--;
228 return score_delete(row);
229 }
230 /* !was_admissible && is_admissible */
231 current_playlist.length++;
232 return score_add(row, 0); /* play it immediately */
233 }
234
235 /**
236 * Handle afs events relevant to playlists.
237 *
238 * \param event The event type.
239 * \param pb Unused.
240 * \param data Depends on the event type.
241 *
242 * \return Standard.
243 */
244 int playlists_event_handler(enum afs_events event,
245 __a_unused struct para_buffer *pb, void *data)
246 {
247 int ret;
248 struct afsi_change_event_data *aced = data;
249
250 switch(event) {
251 case AFSI_CHANGE:
252 return playlist_update_audio_file(aced->aft_row);
253 case AUDIO_FILE_RENAME:
254 case AUDIO_FILE_ADD:
255 return handle_audio_file_event(event, data);
256 case AUDIO_FILE_REMOVE:
257 ret = row_belongs_to_score_table(data, NULL);
258 if (ret < 0)
259 return ret;
260 if (!ret)
261 return 1;
262 current_playlist.length--;
263 return score_delete(data);
264 default:
265 return 1;
266 }
267 }