Fix para_strerror() and use osl() wrapper for osl library calls.
[paraslash.git] / playlist.c
1 /*
2 * Copyright (C) 2007-2009 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 #include <osl.h>
8 #include "para.h"
9 #include "error.h"
10 #include "string.h"
11 #include "afh.h"
12 #include "afs.h"
13 #include "ipc.h"
14
15 /** \file playlist.c Functions for loading and saving playlists. */
16
17 /** Structure used for adding entries to a playlist. */
18 struct playlist_info {
19 /** The name of the playlist. */
20 char *name;
21 /** The number of entries currently in the playlist. */
22 unsigned length;
23 };
24 static struct playlist_info current_playlist;
25
26 /**
27 * Re-insert an audio file into the tree of admissible files.
28 *
29 * \param aft_row Determines the audio file.
30 *
31 * \return The return value of score_update().
32 */
33 static int playlist_update_audio_file(const struct osl_row *aft_row)
34 {
35 /* always re-insert to the top of the tree */
36 return score_update(aft_row, 0);
37 }
38
39 static int add_playlist_entry(char *path, void *data)
40 {
41 struct playlist_info *playlist = data;
42 struct osl_row *aft_row;
43 int ret = aft_get_row_of_path(path, &aft_row);
44
45 if (ret < 0) {
46 PARA_NOTICE_LOG("%s: %s\n", path, para_strerror(-ret));
47 return 1;
48 }
49 ret = score_add(aft_row, -playlist->length);
50 if (ret < 0) {
51 PARA_ERROR_LOG("failed to add %s: %s\n", path, para_strerror(-ret));
52 return ret;
53 }
54 playlist->length++;
55 return 1;
56 }
57
58 /* returns -E_PLAYLIST_LOADED on _success_ to terminate the loop */
59 static int load_playlist(struct osl_row *row, void *data)
60 {
61 struct playlist_info *playlist = data;
62 struct osl_object playlist_def;
63 char *playlist_name;
64 int ret;
65
66 ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
67 if (ret < 0)
68 goto err;
69 playlist->length = 0;
70 ret = for_each_line_ro(playlist_def.data, playlist_def.size,
71 add_playlist_entry, playlist);
72 osl_close_disk_object(&playlist_def);
73 if (ret < 0)
74 goto err;
75 ret = -E_PLAYLIST_EMPTY;
76 if (!playlist->length)
77 goto err;
78 playlist->name = para_strdup(playlist_name);
79 PARA_NOTICE_LOG("loaded playlist %s (%u files)\n", playlist->name,
80 playlist->length);
81 return -E_PLAYLIST_LOADED;
82 err:
83 if (ret != -E_DUMMY_ROW)
84 PARA_NOTICE_LOG("unable to load playlist (%s)\n",
85 para_strerror(-ret));
86 return 1;
87 }
88
89 static int check_playlist_path(char *path, void *data)
90 {
91 struct para_buffer *pb = data;
92 struct osl_row *aft_row;
93 int ret = aft_get_row_of_path(path, &aft_row);
94
95 if (ret >= 0)
96 return 1;
97 return para_printf(pb, "%s: %s\n", path, para_strerror(-ret));
98 }
99
100 static int check_playlist(struct osl_row *row, void *data)
101 {
102 struct para_buffer *pb = data;
103 struct osl_object playlist_def;
104 char *playlist_name;
105 int ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
106
107 if (ret < 0)
108 return para_printf(pb, "failed to get playlist data: %s\n",
109 para_strerror(-ret));
110 if (*playlist_name) { /* skip dummy row */
111 ret = para_printf(pb, "checking playlist %s...\n", playlist_name);
112 if (ret < 0)
113 return ret;
114 ret = for_each_line_ro(playlist_def.data, playlist_def.size,
115 check_playlist_path, pb);
116 }
117 osl_close_disk_object(&playlist_def);
118 return ret;
119 }
120
121 /**
122 * Check the playlist table for inconsistencies.
123 *
124 * \param fd The afs socket.
125 * \param query Unused.
126 *
127 * \return The return value of the underlying call to osl_rbtree_loop().
128 */
129 void playlist_check_callback(int fd, __a_unused const struct osl_object *query)
130 {
131 struct para_buffer pb = {
132 .max_size = SHMMAX,
133 .private_data = &fd,
134 .max_size_handler = pass_buffer_as_shm
135 };
136 int ret = para_printf(&pb, "checking playlists...\n");
137
138 if (ret < 0)
139 return;
140 osl_rbtree_loop(playlists_table, BLOBCOL_ID, &pb,
141 check_playlist);
142 if (pb.offset)
143 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
144 free(pb.buf);
145 }
146
147 /**
148 * Close the current playlist.
149 *
150 * \sa playlist_open().
151 */
152 void playlist_close(void)
153 {
154 if (!current_playlist.name)
155 return;
156 free(current_playlist.name);
157 current_playlist.name = NULL;
158 }
159
160 /**
161 * Open the given playlist.
162 *
163 * \param name The name of the playlist to open.
164 *
165 * Files which are listed in the playlist, but not contained in the database
166 * are ignored. This is not considered an error.
167 *
168 * \return Standard.
169 */
170 int playlist_open(char *name)
171 {
172 struct osl_object obj;
173 int ret;
174 struct osl_row *row;
175
176 obj.data = name;
177 obj.size = strlen(obj.data);
178 ret = osl(osl_get_row(playlists_table, BLOBCOL_NAME, &obj, &row));
179 if (ret < 0) {
180 PARA_NOTICE_LOG("failed to load playlist %s\n", name);
181 return ret;
182 }
183 playlist_close();
184 ret = load_playlist(row, &current_playlist);
185 return (ret == -E_PLAYLIST_LOADED)? current_playlist.length : ret;
186 }
187
188 static int search_path(char *path, void *data)
189 {
190 if (strcmp(path, data))
191 return 1;
192 return -E_PATH_FOUND;
193 }
194
195 static int handle_audio_file_event(enum afs_events event, void *data)
196 {
197 int ret, was_admissible = 0, is_admissible;
198 struct osl_object playlist_def;
199 char *new_path;
200 const struct osl_row *row = data;
201
202 if (!current_playlist.name)
203 return 1;
204 if (event == AUDIO_FILE_RENAME) {
205 ret = row_belongs_to_score_table(row, NULL);
206 if (ret < 0)
207 return ret;
208 was_admissible = ret;
209 }
210 ret = get_audio_file_path_of_row(row, &new_path);
211 if (ret < 0)
212 return ret;
213 ret = pl_get_def_by_name(current_playlist.name, &playlist_def);
214 if (ret < 0)
215 return ret;
216 ret = for_each_line_ro(playlist_def.data, playlist_def.size,
217 search_path, new_path);
218 osl_close_disk_object(&playlist_def);
219 is_admissible = (ret < 0);
220 if (was_admissible && is_admissible)
221 return 1;
222 if (!was_admissible && !is_admissible)
223 return 1;
224 if (was_admissible && !is_admissible) {
225 current_playlist.length--;
226 return score_delete(row);
227 }
228 /* !was_admissible && is_admissible */
229 current_playlist.length++;
230 return score_add(row, 0); /* play it immediately */
231 }
232
233 /**
234 * Handle afs events relevant to playlists.
235 *
236 * \param event The event type.
237 * \param pb Unused.
238 * \param data Depends on the event type.
239 *
240 * \return Standard.
241 */
242 int playlists_event_handler(enum afs_events event,
243 __a_unused struct para_buffer *pb, void *data)
244 {
245 int ret;
246 struct afsi_change_event_data *aced = data;
247
248 switch(event) {
249 case AFSI_CHANGE:
250 return playlist_update_audio_file(aced->aft_row);
251 case AUDIO_FILE_RENAME:
252 case AUDIO_FILE_ADD:
253 return handle_audio_file_event(event, data);
254 case AUDIO_FILE_REMOVE:
255 ret = row_belongs_to_score_table(data, NULL);
256 if (ret < 0)
257 return ret;
258 if (!ret)
259 return 1;
260 current_playlist.length--;
261 return score_delete(data);
262 default:
263 return 1;
264 }
265 }