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1 | #ifndef CTF_MSG_ITER_H |
2 | #define CTF_MSG_ITER_H | |
e98a2d6e PP |
3 | |
4 | /* | |
d6e69534 | 5 | * Babeltrace - CTF message iterator |
fc917f65 | 6 | * |
e98a2d6e PP |
7 | * Copyright (c) 2015-2016 EfficiOS Inc. and Linux Foundation |
8 | * Copyright (c) 2015-2016 Philippe Proulx <pproulx@efficios.com> | |
9 | * | |
10 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
11 | * of this software and associated documentation files (the "Software"), to deal | |
12 | * in the Software without restriction, including without limitation the rights | |
13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
14 | * copies of the Software, and to permit persons to whom the Software is | |
15 | * furnished to do so, subject to the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice shall be included in | |
18 | * all copies or substantial portions of the Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
23 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
26 | * SOFTWARE. | |
27 | */ | |
28 | ||
c4f23e30 | 29 | #include <stdbool.h> |
e98a2d6e PP |
30 | #include <stdint.h> |
31 | #include <stdio.h> | |
32 | #include <stddef.h> | |
3fadfbc0 | 33 | #include <babeltrace2/babeltrace.h> |
91d81473 | 34 | #include "common/macros.h" |
e98a2d6e | 35 | |
44c440bc PP |
36 | #include "../metadata/ctf-meta.h" |
37 | ||
e98a2d6e | 38 | /** |
d6e69534 | 39 | * @file ctf-msg-iter.h |
e98a2d6e | 40 | * |
d6e69534 | 41 | * CTF message iterator |
fc917f65 | 42 | * |
e98a2d6e | 43 | * This is a common internal API used by CTF source plugins. It allows |
d6e69534 | 44 | * one to get messages from a user-provided medium. |
e98a2d6e PP |
45 | */ |
46 | ||
47 | /** | |
48 | * Medium operations status codes. | |
49 | */ | |
18a1979b | 50 | enum ctf_msg_iter_medium_status { |
e98a2d6e PP |
51 | /** |
52 | * End of file. | |
53 | * | |
d6e69534 | 54 | * The medium function called by the message iterator |
e98a2d6e PP |
55 | * function reached the end of the file. |
56 | */ | |
18a1979b | 57 | CTF_MSG_ITER_MEDIUM_STATUS_EOF = 1, |
e98a2d6e PP |
58 | |
59 | /** | |
60 | * There is no data available right now, try again later. | |
61 | */ | |
18a1979b | 62 | CTF_MSG_ITER_MEDIUM_STATUS_AGAIN = 11, |
9e0c8dbb | 63 | |
e98a2d6e | 64 | /** General error. */ |
18a1979b | 65 | CTF_MSG_ITER_MEDIUM_STATUS_ERROR = -1, |
e98a2d6e PP |
66 | |
67 | /** Everything okay. */ | |
18a1979b | 68 | CTF_MSG_ITER_MEDIUM_STATUS_OK = 0, |
e98a2d6e PP |
69 | }; |
70 | ||
71 | /** | |
d6e69534 | 72 | * CTF message iterator API status code. |
e98a2d6e | 73 | */ |
18a1979b | 74 | enum ctf_msg_iter_status { |
e98a2d6e PP |
75 | /** |
76 | * End of file. | |
77 | * | |
d6e69534 | 78 | * The medium function called by the message iterator |
e98a2d6e PP |
79 | * function reached the end of the file. |
80 | */ | |
18a1979b | 81 | CTF_MSG_ITER_STATUS_EOF = CTF_MSG_ITER_MEDIUM_STATUS_EOF, |
e98a2d6e PP |
82 | |
83 | /** | |
84 | * There is no data available right now, try again later. | |
85 | * | |
86 | * Some condition resulted in the | |
18a1979b | 87 | * ctf_msg_iter_medium_ops::request_bytes() user function not |
e98a2d6e | 88 | * having access to any data now. You should retry calling the |
d6e69534 | 89 | * last called message iterator function once the situation |
e98a2d6e PP |
90 | * is resolved. |
91 | */ | |
18a1979b | 92 | CTF_MSG_ITER_STATUS_AGAIN = CTF_MSG_ITER_MEDIUM_STATUS_AGAIN, |
e98a2d6e | 93 | |
e98a2d6e | 94 | /** General error. */ |
18a1979b | 95 | CTF_MSG_ITER_STATUS_ERROR = CTF_MSG_ITER_MEDIUM_STATUS_ERROR, |
e98a2d6e PP |
96 | |
97 | /** Everything okay. */ | |
18a1979b | 98 | CTF_MSG_ITER_STATUS_OK = CTF_MSG_ITER_MEDIUM_STATUS_OK, |
e98a2d6e PP |
99 | }; |
100 | ||
101 | /** | |
102 | * Medium operations. | |
103 | * | |
d6e69534 | 104 | * Those user functions are called by the message iterator |
e98a2d6e PP |
105 | * functions to request medium actions. |
106 | */ | |
18a1979b | 107 | struct ctf_msg_iter_medium_ops { |
e98a2d6e PP |
108 | /** |
109 | * Returns the next byte buffer to be used by the binary file | |
110 | * reader to deserialize binary data. | |
111 | * | |
112 | * This function \em must be defined. | |
113 | * | |
114 | * The purpose of this function is to return a buffer of bytes | |
d6e69534 | 115 | * to the message iterator, of a maximum of \p request_sz |
e98a2d6e PP |
116 | * bytes. If this function cannot return a buffer of at least |
117 | * \p request_sz bytes, it may return a smaller buffer. In | |
118 | * either cases, \p buffer_sz must be set to the returned buffer | |
119 | * size (in bytes). | |
120 | * | |
121 | * The returned buffer's ownership remains the medium, in that | |
d6e69534 PP |
122 | * it won't be freed by the message iterator functions. The |
123 | * returned buffer won't be modified by the message | |
e98a2d6e PP |
124 | * iterator functions either. |
125 | * | |
126 | * When this function is called for the first time for a given | |
127 | * file, the offset within the file is considered to be 0. The | |
128 | * next times this function is called, the returned buffer's | |
129 | * byte offset within the complete file must be the previous | |
130 | * offset plus the last returned value of \p buffer_sz by this | |
131 | * medium. | |
132 | * | |
133 | * This function must return one of the following statuses: | |
134 | * | |
18a1979b | 135 | * - <b>#CTF_MSG_ITER_MEDIUM_STATUS_OK</b>: Everything |
e98a2d6e PP |
136 | * is okay, i.e. \p buffer_sz is set to a positive value |
137 | * reflecting the number of available bytes in the buffer | |
138 | * starting at the address written in \p buffer_addr. | |
18a1979b | 139 | * - <b>#CTF_MSG_ITER_MEDIUM_STATUS_AGAIN</b>: No data is |
d6e69534 | 140 | * available right now. In this case, the message |
e98a2d6e | 141 | * iterator function called by the user returns |
18a1979b | 142 | * #CTF_MSG_ITER_STATUS_AGAIN, and it is the user's |
e98a2d6e | 143 | * responsibility to make sure enough data becomes available |
d6e69534 | 144 | * before calling the \em same message iterator |
e98a2d6e | 145 | * function again to continue the decoding process. |
18a1979b | 146 | * - <b>#CTF_MSG_ITER_MEDIUM_STATUS_EOF</b>: The end of |
e98a2d6e | 147 | * the file was reached, and no more data will ever be |
d6e69534 | 148 | * available for this file. In this case, the message |
e98a2d6e | 149 | * iterator function called by the user returns |
18a1979b | 150 | * #CTF_MSG_ITER_STATUS_EOF. This must \em not be |
e98a2d6e PP |
151 | * returned when returning at least one byte of data to the |
152 | * caller, i.e. this must be returned when there's | |
153 | * absolutely nothing left; should the request size be | |
154 | * larger than what's left in the file, this function must | |
155 | * return what's left, setting \p buffer_sz to the number of | |
156 | * remaining bytes, and return | |
18a1979b | 157 | * #CTF_MSG_ITER_MEDIUM_STATUS_EOF on the \em following |
e98a2d6e | 158 | * call. |
18a1979b | 159 | * - <b>#CTF_MSG_ITER_MEDIUM_STATUS_ERROR</b>: A fatal |
e98a2d6e | 160 | * error occured during this operation. In this case, the |
d6e69534 | 161 | * message iterator function called by the user returns |
18a1979b | 162 | * #CTF_MSG_ITER_STATUS_ERROR. |
e98a2d6e | 163 | * |
18a1979b | 164 | * If #CTF_MSG_ITER_MEDIUM_STATUS_OK is not returned, the |
e98a2d6e PP |
165 | * values of \p buffer_sz and \p buffer_addr are \em ignored by |
166 | * the caller. | |
167 | * | |
168 | * @param request_sz Requested buffer size (bytes) | |
169 | * @param buffer_addr Returned buffer address | |
170 | * @param buffer_sz Returned buffer's size (bytes) | |
171 | * @param data User data | |
172 | * @returns Status code (see description above) | |
173 | */ | |
18a1979b | 174 | enum ctf_msg_iter_medium_status (* request_bytes)(size_t request_sz, |
fc917f65 | 175 | uint8_t **buffer_addr, size_t *buffer_sz, void *data); |
e98a2d6e | 176 | |
9e0c8dbb JG |
177 | /** |
178 | * Repositions the underlying stream's position. | |
179 | * | |
180 | * This *optional* method repositions the underlying stream | |
701a0903 | 181 | * to a given absolute position in the medium. |
9e0c8dbb | 182 | * |
9e0c8dbb JG |
183 | * @param offset Offset to use for the given directive |
184 | * @param data User data | |
18a1979b | 185 | * @returns One of #ctf_msg_iter_medium_status values |
9e0c8dbb | 186 | */ |
701a0903 | 187 | enum ctf_msg_iter_medium_status (* seek)(off_t offset, void *data); |
9e0c8dbb | 188 | |
e98a2d6e PP |
189 | /** |
190 | * Returns a stream instance (weak reference) for the given | |
191 | * stream class. | |
192 | * | |
193 | * This is called after a packet header is read, and the | |
d6e69534 | 194 | * corresponding stream class is found by the message |
e98a2d6e PP |
195 | * iterator. |
196 | * | |
b92735af PP |
197 | * @param stream_class Stream class of the stream to get |
198 | * @param stream_id Stream (instance) ID of the stream | |
199 | * to get (-1ULL if not available) | |
e98a2d6e PP |
200 | * @param data User data |
201 | * @returns Stream instance (weak reference) or | |
202 | * \c NULL on error | |
203 | */ | |
fc917f65 | 204 | bt_stream * (* borrow_stream)(bt_stream_class *stream_class, |
44c440bc | 205 | int64_t stream_id, void *data); |
e98a2d6e PP |
206 | }; |
207 | ||
d6e69534 | 208 | /** CTF message iterator. */ |
18a1979b | 209 | struct ctf_msg_iter; |
e98a2d6e | 210 | |
e98a2d6e | 211 | /** |
d6e69534 | 212 | * Creates a CTF message iterator. |
e98a2d6e PP |
213 | * |
214 | * Upon successful completion, the reference count of \p trace is | |
215 | * incremented. | |
216 | * | |
217 | * @param trace Trace to read | |
218 | * @param max_request_sz Maximum buffer size, in bytes, to | |
219 | * request to | |
18a1979b | 220 | * ctf_msg_iter_medium_ops::request_bytes() |
e98a2d6e PP |
221 | * at a time |
222 | * @param medops Medium operations | |
223 | * @param medops_data User data (passed to medium operations) | |
d6e69534 | 224 | * @returns New CTF message iterator on |
e98a2d6e PP |
225 | * success, or \c NULL on error |
226 | */ | |
2cf1d51e | 227 | BT_HIDDEN |
851de941 SM |
228 | struct ctf_msg_iter *ctf_msg_iter_create( |
229 | struct ctf_trace_class *tc, | |
230 | size_t max_request_sz, | |
231 | struct ctf_msg_iter_medium_ops medops, | |
232 | void *medops_data, | |
233 | bt_logging_level log_level, | |
234 | bt_self_component *self_comp, | |
235 | bt_self_message_iterator *self_msg_iter); | |
e98a2d6e PP |
236 | |
237 | /** | |
d6e69534 | 238 | * Destroys a CTF message iterator, freeing all internal resources. |
e98a2d6e PP |
239 | * |
240 | * The registered trace's reference count is decremented. | |
241 | * | |
d6e69534 | 242 | * @param msg_iter CTF message iterator |
e98a2d6e | 243 | */ |
2cf1d51e | 244 | BT_HIDDEN |
18a1979b | 245 | void ctf_msg_iter_destroy(struct ctf_msg_iter *msg_iter); |
e98a2d6e | 246 | |
e98a2d6e | 247 | /** |
d6e69534 | 248 | * Returns the next message from a CTF message iterator. |
e98a2d6e | 249 | * |
18a1979b | 250 | * Upon successful completion, #CTF_MSG_ITER_STATUS_OK is |
d6e69534 | 251 | * returned, and the next message is written to \p msg. |
e98a2d6e | 252 | * In this case, the caller is responsible for calling |
d6e69534 | 253 | * bt_message_put() on the returned message. |
e98a2d6e | 254 | * |
18a1979b | 255 | * If this function returns #CTF_MSG_ITER_STATUS_AGAIN, the caller |
e98a2d6e PP |
256 | * should make sure that data becomes available to its medium, and |
257 | * call this function again, until another status is returned. | |
258 | * | |
d6e69534 PP |
259 | * @param msg_iter CTF message iterator |
260 | * @param message Returned message if the function's | |
18a1979b SM |
261 | * return value is #CTF_MSG_ITER_STATUS_OK |
262 | * @returns One of #ctf_msg_iter_status values | |
e98a2d6e | 263 | */ |
2cf1d51e | 264 | BT_HIDDEN |
18a1979b SM |
265 | enum ctf_msg_iter_status ctf_msg_iter_get_next_message( |
266 | struct ctf_msg_iter *msg_it, | |
cad707e2 | 267 | const bt_message **message); |
e98a2d6e | 268 | |
18a1979b | 269 | struct ctf_msg_iter_packet_properties { |
fc917f65 PP |
270 | int64_t exp_packet_total_size; |
271 | int64_t exp_packet_content_size; | |
44c440bc PP |
272 | uint64_t stream_class_id; |
273 | int64_t data_stream_id; | |
274 | ||
275 | struct { | |
276 | uint64_t discarded_events; | |
277 | uint64_t packets; | |
278 | uint64_t beginning_clock; | |
279 | uint64_t end_clock; | |
280 | } snapshots; | |
281 | }; | |
282 | ||
283 | BT_HIDDEN | |
18a1979b SM |
284 | enum ctf_msg_iter_status ctf_msg_iter_get_packet_properties( |
285 | struct ctf_msg_iter *msg_it, | |
286 | struct ctf_msg_iter_packet_properties *props); | |
44c440bc | 287 | |
27f26617 | 288 | BT_HIDDEN |
18a1979b SM |
289 | enum ctf_msg_iter_status ctf_msg_iter_curr_packet_first_event_clock_snapshot( |
290 | struct ctf_msg_iter *msg_it, uint64_t *first_event_cs); | |
27f26617 FD |
291 | |
292 | BT_HIDDEN | |
18a1979b SM |
293 | enum ctf_msg_iter_status ctf_msg_iter_curr_packet_last_event_clock_snapshot( |
294 | struct ctf_msg_iter *msg_it, uint64_t *last_event_cs); | |
27f26617 | 295 | |
6de92955 | 296 | BT_HIDDEN |
18a1979b | 297 | void ctf_msg_iter_set_medops_data(struct ctf_msg_iter *msg_it, |
6de92955 PP |
298 | void *medops_data); |
299 | ||
9e0c8dbb | 300 | BT_HIDDEN |
18a1979b SM |
301 | enum ctf_msg_iter_status ctf_msg_iter_seek( |
302 | struct ctf_msg_iter *msg_it, off_t offset); | |
9e0c8dbb | 303 | |
f42867e2 PP |
304 | /* |
305 | * Resets the iterator so that the next requested medium bytes are | |
fc917f65 | 306 | * assumed to be the first bytes of a new stream. Depending on |
18a1979b SM |
307 | * ctf_msg_iter_set_emit_stream_beginning_message(), the first message |
308 | * which this iterator emits after calling ctf_msg_iter_reset() is of | |
309 | * type `CTF_MESSAGE_TYPE_STREAM_BEGINNING`. | |
f42867e2 PP |
310 | */ |
311 | BT_HIDDEN | |
18a1979b | 312 | void ctf_msg_iter_reset(struct ctf_msg_iter *msg_it); |
f42867e2 | 313 | |
495490c5 | 314 | /* |
18a1979b | 315 | * Like ctf_msg_iter_reset(), but preserves stream-dependent state. |
495490c5 PP |
316 | */ |
317 | BT_HIDDEN | |
18a1979b | 318 | void ctf_msg_iter_reset_for_next_stream_file(struct ctf_msg_iter *msg_it); |
495490c5 | 319 | |
44c440bc | 320 | BT_HIDDEN |
18a1979b | 321 | void ctf_msg_iter_set_emit_stream_beginning_message(struct ctf_msg_iter *msg_it, |
fc917f65 PP |
322 | bool val); |
323 | ||
324 | BT_HIDDEN | |
18a1979b | 325 | void ctf_msg_iter_set_emit_stream_end_message(struct ctf_msg_iter *msg_it, |
fc917f65 | 326 | bool val); |
44c440bc | 327 | |
de24a43f | 328 | BT_HIDDEN |
18a1979b | 329 | void ctf_msg_iter_set_dry_run(struct ctf_msg_iter *msg_it, |
de24a43f FD |
330 | bool val); |
331 | ||
fdf0e7a0 | 332 | static inline |
18a1979b SM |
333 | const char *ctf_msg_iter_medium_status_string( |
334 | enum ctf_msg_iter_medium_status status) | |
fdf0e7a0 PP |
335 | { |
336 | switch (status) { | |
18a1979b | 337 | case CTF_MSG_ITER_MEDIUM_STATUS_EOF: |
8a432889 | 338 | return "EOF"; |
18a1979b | 339 | case CTF_MSG_ITER_MEDIUM_STATUS_AGAIN: |
8a432889 | 340 | return "AGAIN"; |
18a1979b | 341 | case CTF_MSG_ITER_MEDIUM_STATUS_ERROR: |
8a432889 | 342 | return "ERROR"; |
18a1979b | 343 | case CTF_MSG_ITER_MEDIUM_STATUS_OK: |
8a432889 | 344 | return "OK"; |
fdf0e7a0 PP |
345 | default: |
346 | return "(unknown)"; | |
347 | } | |
348 | } | |
349 | ||
350 | static inline | |
18a1979b SM |
351 | const char *ctf_msg_iter_status_string( |
352 | enum ctf_msg_iter_status status) | |
fdf0e7a0 PP |
353 | { |
354 | switch (status) { | |
18a1979b | 355 | case CTF_MSG_ITER_STATUS_EOF: |
8a432889 | 356 | return "EOF"; |
18a1979b | 357 | case CTF_MSG_ITER_STATUS_AGAIN: |
8a432889 | 358 | return "AGAIN"; |
18a1979b | 359 | case CTF_MSG_ITER_STATUS_ERROR: |
8a432889 | 360 | return "ERROR"; |
18a1979b | 361 | case CTF_MSG_ITER_STATUS_OK: |
8a432889 | 362 | return "OK"; |
fdf0e7a0 PP |
363 | default: |
364 | return "(unknown)"; | |
365 | } | |
366 | } | |
367 | ||
d6e69534 | 368 | #endif /* CTF_MSG_ITER_H */ |