Introduce afs_max_size_handler_data and afs_max_size_handler().
[paraslash.git] / playlist.c
1 /*
2 * Copyright (C) 2007-2012 Andre Noll <maan@systemlinux.org>
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
17 /** \file playlist.c Functions for loading and saving playlists. */
18
19 /** Structure used for adding entries to a playlist. */
20 struct playlist_info {
21 /** The name of the playlist. */
22 char *name;
23 /** The number of entries currently in the playlist. */
24 unsigned length;
25 };
26 static struct playlist_info current_playlist;
27
28 /**
29 * Re-insert an audio file into the tree of admissible files.
30 *
31 * \param aft_row Determines the audio file.
32 *
33 * \return The return value of score_update().
34 */
35 static int playlist_update_audio_file(const struct osl_row *aft_row)
36 {
37 /* always re-insert to the top of the tree */
38 return score_update(aft_row, 0);
39 }
40
41 static int add_playlist_entry(char *path, void *data)
42 {
43 struct playlist_info *playlist = data;
44 struct osl_row *aft_row;
45 int ret = aft_get_row_of_path(path, &aft_row);
46
47 if (ret < 0) {
48 PARA_NOTICE_LOG("%s: %s\n", path, para_strerror(-ret));
49 return 1;
50 }
51 ret = score_add(aft_row, -playlist->length);
52 if (ret < 0) {
53 PARA_ERROR_LOG("failed to add %s: %s\n", path, para_strerror(-ret));
54 return ret;
55 }
56 playlist->length++;
57 return 1;
58 }
59
60 /* returns -E_PLAYLIST_LOADED on _success_ to terminate the loop */
61 static int load_playlist(struct osl_row *row, void *data)
62 {
63 struct playlist_info *playlist = data;
64 struct osl_object playlist_def;
65 char *playlist_name;
66 int ret;
67
68 ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
69 if (ret < 0)
70 goto err;
71 playlist->length = 0;
72 ret = for_each_line_ro(playlist_def.data, playlist_def.size,
73 add_playlist_entry, playlist);
74 osl_close_disk_object(&playlist_def);
75 if (ret < 0)
76 goto err;
77 ret = -E_PLAYLIST_EMPTY;
78 if (!playlist->length)
79 goto err;
80 playlist->name = para_strdup(playlist_name);
81 PARA_NOTICE_LOG("loaded playlist %s (%u files)\n", playlist->name,
82 playlist->length);
83 return -E_PLAYLIST_LOADED;
84 err:
85 if (ret != -E_DUMMY_ROW)
86 PARA_NOTICE_LOG("unable to load playlist (%s)\n",
87 para_strerror(-ret));
88 return 1;
89 }
90
91 static int check_playlist_path(char *path, void *data)
92 {
93 struct para_buffer *pb = data;
94 struct osl_row *aft_row;
95 int ret = aft_get_row_of_path(path, &aft_row);
96
97 if (ret >= 0)
98 return 1;
99 return para_printf(pb, "%s: %s\n", path, para_strerror(-ret));
100 }
101
102 static int check_playlist(struct osl_row *row, void *data)
103 {
104 struct para_buffer *pb = data;
105 struct osl_object playlist_def;
106 char *playlist_name;
107 int ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
108
109 if (ret < 0)
110 return para_printf(pb, "failed to get playlist data: %s\n",
111 para_strerror(-ret));
112 if (*playlist_name) { /* skip dummy row */
113 ret = para_printf(pb, "checking playlist %s...\n", playlist_name);
114 if (ret < 0)
115 return ret;
116 ret = for_each_line_ro(playlist_def.data, playlist_def.size,
117 check_playlist_path, pb);
118 }
119 osl_close_disk_object(&playlist_def);
120 return ret;
121 }
122
123 /**
124 * Check the playlist table for inconsistencies.
125 *
126 * \param fd The afs socket.
127 * \param query Unused.
128 *
129 * \return The return value of the underlying call to osl_rbtree_loop().
130 */
131 void playlist_check_callback(int fd, __a_unused const struct osl_object *query)
132 {
133 struct para_buffer pb = {
134 .max_size = shm_get_shmmax(),
135 .private_data = &(struct afs_max_size_handler_data) {
136 .fd = fd,
137 },
138 .max_size_handler = afs_max_size_handler,
139 };
140 int ret = para_printf(&pb, "checking playlists...\n");
141
142 if (ret < 0)
143 return;
144 osl_rbtree_loop(playlists_table, BLOBCOL_ID, &pb,
145 check_playlist);
146 if (pb.offset)
147 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
148 free(pb.buf);
149 }
150
151 /**
152 * Close the current playlist.
153 *
154 * \sa playlist_open().
155 */
156 void playlist_close(void)
157 {
158 if (!current_playlist.name)
159 return;
160 free(current_playlist.name);
161 current_playlist.name = NULL;
162 }
163
164 /**
165 * Open the given playlist.
166 *
167 * \param name The name of the playlist to open.
168 *
169 * Files which are listed in the playlist, but not contained in the database
170 * are ignored. This is not considered an error.
171 *
172 * \return Standard.
173 */
174 int playlist_open(char *name)
175 {
176 struct osl_object obj;
177 int ret;
178 struct osl_row *row;
179
180 obj.data = name;
181 obj.size = strlen(obj.data);
182 ret = osl(osl_get_row(playlists_table, BLOBCOL_NAME, &obj, &row));
183 if (ret < 0) {
184 PARA_NOTICE_LOG("failed to load playlist %s\n", name);
185 return ret;
186 }
187 playlist_close();
188 ret = load_playlist(row, &current_playlist);
189 return (ret == -E_PLAYLIST_LOADED)? current_playlist.length : ret;
190 }
191
192 static int search_path(char *path, void *data)
193 {
194 if (strcmp(path, data))
195 return 1;
196 return -E_PATH_FOUND;
197 }
198
199 static int handle_audio_file_event(enum afs_events event, void *data)
200 {
201 int ret, was_admissible = 0, is_admissible;
202 struct osl_object playlist_def;
203 char *new_path;
204 const struct osl_row *row = data;
205
206 if (!current_playlist.name)
207 return 1;
208 if (event == AUDIO_FILE_RENAME) {
209 ret = row_belongs_to_score_table(row, NULL);
210 if (ret < 0)
211 return ret;
212 was_admissible = ret;
213 }
214 ret = get_audio_file_path_of_row(row, &new_path);
215 if (ret < 0)
216 return ret;
217 ret = pl_get_def_by_name(current_playlist.name, &playlist_def);
218 if (ret < 0)
219 return ret;
220 ret = for_each_line_ro(playlist_def.data, playlist_def.size,
221 search_path, new_path);
222 osl_close_disk_object(&playlist_def);
223 is_admissible = (ret < 0);
224 if (was_admissible && is_admissible)
225 return 1;
226 if (!was_admissible && !is_admissible)
227 return 1;
228 if (was_admissible && !is_admissible) {
229 current_playlist.length--;
230 return score_delete(row);
231 }
232 /* !was_admissible && is_admissible */
233 current_playlist.length++;
234 return score_add(row, 0); /* play it immediately */
235 }
236
237 /**
238 * Handle afs events relevant to playlists.
239 *
240 * \param event The event type.
241 * \param pb Unused.
242 * \param data Depends on the event type.
243 *
244 * \return Standard.
245 */
246 int playlists_event_handler(enum afs_events event,
247 __a_unused struct para_buffer *pb, void *data)
248 {
249 int ret;
250 struct afsi_change_event_data *aced = data;
251
252 switch(event) {
253 case AFSI_CHANGE:
254 return playlist_update_audio_file(aced->aft_row);
255 case AUDIO_FILE_RENAME:
256 case AUDIO_FILE_ADD:
257 return handle_audio_file_event(event, data);
258 case AUDIO_FILE_REMOVE:
259 ret = row_belongs_to_score_table(data, NULL);
260 if (ret < 0)
261 return ret;
262 if (!ret)
263 return 1;
264 current_playlist.length--;
265 return score_delete(data);
266 default:
267 return 1;
268 }
269 }