Obtain afs status items directly from afs.
[paraslash.git] / afs.h
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 /** \file afs.h Exported symbols of the audio file selector. */
8
9 #include <regex.h>
10 #include "hash.h"
11
12 /** Audio file selector data stored in the audio file table. */
13 struct afs_info {
14 /** Seconds since the epoch. */
15 uint64_t last_played;
16 /** Bit field of set attributes. */
17 uint64_t attributes;
18 /** Counts how many times the file was selected. */
19 uint32_t num_played;
20 /** Image blob associated with this file (foreign key). */
21 uint32_t image_id;
22 /** Lyrics blob associated with this file (foreign key). */
23 uint32_t lyrics_id;
24 /** Mp3, ogg or aac. */
25 uint8_t audio_format_id;
26 /** Amplification value. */
27 uint8_t amp;
28 };
29
30 /**
31 * Events caused by changes to an afs table.
32 *
33 * Whenever an afs table changes, an event is generated which causes afs to
34 * call the event handlers of all other tables. For example, if an audio file
35 * is added, the event handler of the mood table checks the new file for
36 * admissibility.
37 */
38 enum afs_events {
39 /** An attribute was added. */
40 ATTRIBUTE_ADD,
41 /** An attribute was renamed. */
42 ATTRIBUTE_RENAME,
43 /** An attribute was removed. */
44 ATTRIBUTE_REMOVE,
45 /** The afs info struct of an audio file changed. */
46 AFSI_CHANGE,
47 /** The afh info struct of an audio file changed. */
48 AFHI_CHANGE,
49 /** An audio file was renamed. */
50 AUDIO_FILE_RENAME,
51 /** An audio file was added. */
52 AUDIO_FILE_ADD,
53 /** An audio file is about to be removed. */
54 AUDIO_FILE_REMOVE,
55 /** A new blob was added. */
56 BLOB_ADD,
57 /** A blob was renamed. */
58 BLOB_RENAME,
59 /** A blob is about to be removed. */
60 BLOB_REMOVE,
61 };
62
63 /**
64 * Used as data for \ref afs_event() for events of type \p ATTRIBUTE_ADD.
65 */
66 struct rmatt_event_data {
67 /** The name of the attribute being added. */
68 const char *name;
69 /** Its bit number. */
70 unsigned char bitnum;
71 };
72
73 /**
74 * Used as data for \ref afs_event() for events of type \p ATTRIBUTE_AFSI_CHANGE.
75 */
76 struct afsi_change_event_data {
77 /** Pointer to the row that has changed. */
78 struct osl_row *aft_row;
79 /** Afs info before the change. */
80 struct afs_info *old_afsi;
81 };
82
83 /** Function pointers for table handling. */
84 struct afs_table {
85 /** Initializes the other pointers in this struct. */
86 void (*init)(struct afs_table *t);
87 /** The name of this table. */
88 const char *name;
89 /** Gets called on startup and on \p SIGHUP. */
90 int (*open)(const char *base_dir);
91 /** Gets called on shutdown and on \p SIGHUP. */
92 void (*close)(void);
93 /** Called by the \a init afs command. */
94 int (*create)(const char *);
95 /** Handles afs events. */
96 int (*event_handler)(enum afs_events event, struct para_buffer *pb,
97 void *data);
98 };
99
100 enum play_mode {PLAY_MODE_MOOD, PLAY_MODE_PLAYLIST};
101
102 /**
103 * Data about one audio file.
104 *
105 * Needed to produce ls and stat output.
106 */
107 struct ls_data {
108 /** Usual audio format handler information. */
109 struct afh_info afhi;
110 /** Audio file selector information. */
111 struct afs_info afsi;
112 /** The full path of the audio file. */
113 char *path;
114 /** The score value (if -a was given). */
115 long score;
116 /** The sha1 hash of audio file. */
117 HASH_TYPE *hash;
118 };
119
120 int send_afs_status(int fd);
121
122 /** Data about the current audio file, passed from afs to server. */
123 struct audio_file_data {
124 /** The open file descriptor to the current audio file. */
125 int fd;
126 /** Vss needs this for streaming. */
127 struct afh_info afhi;
128 };
129
130 enum afs_server_code {
131 NEXT_AUDIO_FILE,
132 NO_ADMISSIBLE_FILES,
133 AFD_CHANGE
134 };
135
136 /** Flags passed to for_each_matching_row(). */
137 enum pattern_match_flags {
138 /** Loop in reverse order. */
139 PM_REVERSE_LOOP = 1,
140 /** If no pattern is given, loop over all rows. */
141 PM_NO_PATTERN_MATCHES_EVERYTHING = 2,
142 /** If the data in match_column is the empty string, skip this row. */
143 PM_SKIP_EMPTY_NAME = 4,
144 };
145
146 /** Structure passed to for_each_matching_row(). */
147 struct pattern_match_data {
148 /** Loop over all rows in this table. */
149 struct osl_table *table;
150 /** Determines the loop order. Must be an rbtree column. */
151 unsigned loop_col_num;
152 /** Data from this column is matched against the given patterns. */
153 unsigned match_col_num;
154 /** \see pattern_match_flags. */
155 unsigned pm_flags;
156 /** This value is passed verbatim to fnmatch(). */
157 int fnmatch_flags;
158 /** Null-terminated array of patterns. */
159 struct osl_object patterns;
160 /** Data pointer passed to the action function. */
161 void *data;
162 /** For each matching row, this function will be called. */
163 int (*action)(struct osl_table *table, struct osl_row *row, const char *name, void *data);
164 };
165
166
167 /**
168 * Afs command handlers run as a process which is not related to the afs
169 * process, i.e. they can not change the address space of afs directly.
170 * Therefore afs commands typically consist of two functions: The command
171 * handler and the corresponding callback function that runs in afs context.
172 *
173 * \sa send_callback_request().
174 */
175 typedef void callback_function(int fd, const struct osl_object *);
176
177 /**
178 * Callbacks send chunks to data back to the command handler. Pointers to
179 * this type of function are used by \ref send_callback_request and friends
180 * to deal with the data in the command handler process.
181 *
182 * \sa \ref send_callback_request().
183 */
184 typedef int callback_result_handler(struct osl_object *result, void *private);
185 int send_result(struct osl_object *result, void *fd_ptr);
186 int pass_buffer_as_shm(char *buf, size_t size, void *fd_ptr);
187
188 __noreturn void afs_init(uint32_t cookie, int socket_fd);
189 void afs_event(enum afs_events event, struct para_buffer *pb,
190 void *data);
191 int send_callback_request(callback_function *f, struct osl_object *query,
192 callback_result_handler *result_handler,
193 void *private_result_data);
194 int send_option_arg_callback_request(struct osl_object *options,
195 int argc, char * const * const argv, callback_function *f,
196 callback_result_handler *result_handler,
197 void *private_result_data);
198 int send_standard_callback_request(int argc, char * const * const argv,
199 callback_function *f, callback_result_handler *result_handler,
200 void *private_result_data);
201 int stdin_command(int fd, struct osl_object *arg_obj, callback_function *f,
202 unsigned max_len, callback_result_handler *result_handler,
203 void *private_result_data);
204 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2);
205 int for_each_matching_row(struct pattern_match_data *pmd);
206
207 /* score */
208 void score_init(struct afs_table *t);
209 int admissible_file_loop(void *data, osl_rbtree_loop_func *func);
210 int admissible_file_loop_reverse(void *data, osl_rbtree_loop_func *func);
211 int score_get_best(struct osl_row **aft_row, long *score);
212 int get_score_and_aft_row(struct osl_row *score_row, long *score, struct osl_row **aft_row);
213 int score_add(const struct osl_row *row, long score);
214 int score_update(const struct osl_row *aft_row, long new_score);
215 int get_num_admissible_files(unsigned *num);
216 int score_delete(const struct osl_row *aft_row);
217 int clear_score_table(void);
218 int row_belongs_to_score_table(const struct osl_row *aft_row, unsigned *rank);
219
220 /* attribute */
221 void attribute_init(struct afs_table *t);
222 void get_attribute_bitmap(const uint64_t *atts, char *buf); /* needed by com_ls() */
223 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum);
224 int get_attribute_text(uint64_t *atts, const char *delim, char **text);
225
226 /* aft */
227 void aft_init(struct afs_table *t);
228 int aft_get_row_of_path(const char *path, struct osl_row **row);
229 int open_and_update_audio_file(struct osl_row *aft_row, long score,
230 struct audio_file_data *afd);
231 int load_afd(int shmid, struct audio_file_data *afd);
232 int load_afsi(struct afs_info *afsi, struct osl_object *obj);
233 void save_afsi(struct afs_info *afsi, struct osl_object *obj);
234 int get_afsi_of_row(const struct osl_row *row, struct afs_info *afsi);
235 int get_afhi_of_row(const struct osl_row *row, struct afh_info *afhi);
236 int get_afsi_of_path(const char *path, struct afs_info *afsi);
237 int get_audio_file_path_of_row(const struct osl_row *row, char **path);
238 int get_afsi_object_of_row(const struct osl_row *row, struct osl_object *obj);
239 int audio_file_loop(void *private_data, osl_rbtree_loop_func *func);
240 void aft_check_callback(int fd, __a_unused const struct osl_object *query);
241
242 /* mood */
243 int change_current_mood(char *mood_name);
244 void close_current_mood(void);
245 int reload_current_mood(void);
246 void mood_check_callback(int fd, __a_unused const struct osl_object *query);
247
248
249 /* playlist */
250 int playlist_open(char *name);
251 void playlist_close(void);
252 void playlist_check_callback(int fd, __a_unused const struct osl_object *query);
253
254 /** evaluates to 1 if x < y, to -1 if x > y and to 0 if x == y */
255 #define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
256
257
258 /** Define exported functions and a table pointer for an osl blob table. */
259 #define DECLARE_BLOB_SYMBOLS(table_name, cmd_prefix) \
260 void table_name ## _init(struct afs_table *t); \
261 int cmd_prefix ## _get_name_by_id(uint32_t id, char **name); \
262 int cmd_prefix ## _get_def_by_id(uint32_t id, struct osl_object *def); \
263 int cmd_prefix ## _get_def_by_name(char *name, struct osl_object *def); \
264 int cmd_prefix ## _get_name_and_def_by_row(const struct osl_row *row, \
265 char **name, struct osl_object *def); \
266 int table_name ##_event_handler(enum afs_events event, \
267 struct para_buffer *pb, void *data); \
268 extern struct osl_table *table_name ## _table;
269
270 DECLARE_BLOB_SYMBOLS(lyrics, lyr);
271 DECLARE_BLOB_SYMBOLS(images, img);
272 DECLARE_BLOB_SYMBOLS(moods, mood);
273 DECLARE_BLOB_SYMBOLS(playlists, pl);
274
275 /** The columns of an abstract blob table. */
276 enum blob_table_columns {
277 /** The identifier, a positive integer that never repeats. */
278 BLOBCOL_ID,
279 /** The unique name of the blob. */
280 BLOBCOL_NAME,
281 /** The actual blob contents. */
282 BLOBCOL_DEF,
283 /** A blob table has that many columns. */
284 NUM_BLOB_COLUMNS
285 };
286
287 /** Define an osl table description for a blob table. */
288 #define DEFINE_BLOB_TABLE_DESC(table_name) \
289 struct osl_table_description table_name ## _table_desc = { \
290 .name = #table_name, \
291 .num_columns = NUM_BLOB_COLUMNS, \
292 .flags = OSL_LARGE_TABLE, \
293 .column_descriptions = blob_cols \
294 };
295
296 /** Define a pointer to an osl blob table with a canonical name. */
297 #define DEFINE_BLOB_TABLE_PTR(table_name) struct osl_table *table_name ## _table;
298
299 /** Define a blob table. */
300 #define INIT_BLOB_TABLE(table_name) \
301 DEFINE_BLOB_TABLE_DESC(table_name); \
302 DEFINE_BLOB_TABLE_PTR(table_name);
303