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0235b0db | 1 | # SPDX-License-Identifier: MIT |
584af91e | 2 | # |
0235b0db | 3 | # Copyright (C) 2019 Philippe Proulx <pproulx@efficios.com> |
584af91e | 4 | # |
584af91e PP |
5 | |
6 | import argparse | |
7 | import collections.abc | |
8 | import logging | |
9 | import os | |
10 | import os.path | |
11 | import re | |
12 | import socket | |
13 | import struct | |
14 | import sys | |
15 | import tempfile | |
2b763e29 | 16 | import json |
78169723 | 17 | from collections import namedtuple |
584af91e PP |
18 | |
19 | ||
20 | class UnexpectedInput(RuntimeError): | |
21 | pass | |
22 | ||
23 | ||
24 | class _LttngLiveViewerCommand: | |
25 | def __init__(self, version): | |
26 | self._version = version | |
27 | ||
28 | @property | |
29 | def version(self): | |
30 | return self._version | |
31 | ||
32 | ||
33 | class _LttngLiveViewerConnectCommand(_LttngLiveViewerCommand): | |
34 | def __init__(self, version, viewer_session_id, major, minor): | |
35 | super().__init__(version) | |
36 | self._viewer_session_id = viewer_session_id | |
37 | self._major = major | |
38 | self._minor = minor | |
39 | ||
40 | @property | |
41 | def viewer_session_id(self): | |
42 | return self._viewer_session_id | |
43 | ||
44 | @property | |
45 | def major(self): | |
46 | return self._major | |
47 | ||
48 | @property | |
49 | def minor(self): | |
50 | return self._minor | |
51 | ||
52 | ||
53 | class _LttngLiveViewerConnectReply: | |
54 | def __init__(self, viewer_session_id, major, minor): | |
55 | self._viewer_session_id = viewer_session_id | |
56 | self._major = major | |
57 | self._minor = minor | |
58 | ||
59 | @property | |
60 | def viewer_session_id(self): | |
61 | return self._viewer_session_id | |
62 | ||
63 | @property | |
64 | def major(self): | |
65 | return self._major | |
66 | ||
67 | @property | |
68 | def minor(self): | |
69 | return self._minor | |
70 | ||
71 | ||
72 | class _LttngLiveViewerGetTracingSessionInfosCommand(_LttngLiveViewerCommand): | |
73 | pass | |
74 | ||
75 | ||
76 | class _LttngLiveViewerTracingSessionInfo: | |
77 | def __init__( | |
78 | self, | |
79 | tracing_session_id, | |
80 | live_timer_freq, | |
81 | client_count, | |
82 | stream_count, | |
83 | hostname, | |
84 | name, | |
85 | ): | |
86 | self._tracing_session_id = tracing_session_id | |
87 | self._live_timer_freq = live_timer_freq | |
88 | self._client_count = client_count | |
89 | self._stream_count = stream_count | |
90 | self._hostname = hostname | |
91 | self._name = name | |
92 | ||
93 | @property | |
94 | def tracing_session_id(self): | |
95 | return self._tracing_session_id | |
96 | ||
97 | @property | |
98 | def live_timer_freq(self): | |
99 | return self._live_timer_freq | |
100 | ||
101 | @property | |
102 | def client_count(self): | |
103 | return self._client_count | |
104 | ||
105 | @property | |
106 | def stream_count(self): | |
107 | return self._stream_count | |
108 | ||
109 | @property | |
110 | def hostname(self): | |
111 | return self._hostname | |
112 | ||
113 | @property | |
114 | def name(self): | |
115 | return self._name | |
116 | ||
117 | ||
118 | class _LttngLiveViewerGetTracingSessionInfosReply: | |
119 | def __init__(self, tracing_session_infos): | |
120 | self._tracing_session_infos = tracing_session_infos | |
121 | ||
122 | @property | |
123 | def tracing_session_infos(self): | |
124 | return self._tracing_session_infos | |
125 | ||
126 | ||
127 | class _LttngLiveViewerAttachToTracingSessionCommand(_LttngLiveViewerCommand): | |
128 | class SeekType: | |
129 | BEGINNING = 1 | |
130 | LAST = 2 | |
131 | ||
132 | def __init__(self, version, tracing_session_id, offset, seek_type): | |
133 | super().__init__(version) | |
134 | self._tracing_session_id = tracing_session_id | |
135 | self._offset = offset | |
136 | self._seek_type = seek_type | |
137 | ||
138 | @property | |
139 | def tracing_session_id(self): | |
140 | return self._tracing_session_id | |
141 | ||
142 | @property | |
143 | def offset(self): | |
144 | return self._offset | |
145 | ||
146 | @property | |
147 | def seek_type(self): | |
148 | return self._seek_type | |
149 | ||
150 | ||
151 | class _LttngLiveViewerStreamInfo: | |
152 | def __init__(self, id, trace_id, is_metadata, path, channel_name): | |
153 | self._id = id | |
154 | self._trace_id = trace_id | |
155 | self._is_metadata = is_metadata | |
156 | self._path = path | |
157 | self._channel_name = channel_name | |
158 | ||
159 | @property | |
160 | def id(self): | |
161 | return self._id | |
162 | ||
163 | @property | |
164 | def trace_id(self): | |
165 | return self._trace_id | |
166 | ||
167 | @property | |
168 | def is_metadata(self): | |
169 | return self._is_metadata | |
170 | ||
171 | @property | |
172 | def path(self): | |
173 | return self._path | |
174 | ||
175 | @property | |
176 | def channel_name(self): | |
177 | return self._channel_name | |
178 | ||
179 | ||
180 | class _LttngLiveViewerAttachToTracingSessionReply: | |
181 | class Status: | |
182 | OK = 1 | |
183 | ALREADY = 2 | |
184 | UNKNOWN = 3 | |
185 | NOT_LIVE = 4 | |
186 | SEEK_ERROR = 5 | |
187 | NO_SESSION = 6 | |
188 | ||
189 | def __init__(self, status, stream_infos): | |
190 | self._status = status | |
191 | self._stream_infos = stream_infos | |
192 | ||
193 | @property | |
194 | def status(self): | |
195 | return self._status | |
196 | ||
197 | @property | |
198 | def stream_infos(self): | |
199 | return self._stream_infos | |
200 | ||
201 | ||
202 | class _LttngLiveViewerGetNextDataStreamIndexEntryCommand(_LttngLiveViewerCommand): | |
203 | def __init__(self, version, stream_id): | |
204 | super().__init__(version) | |
205 | self._stream_id = stream_id | |
206 | ||
207 | @property | |
208 | def stream_id(self): | |
209 | return self._stream_id | |
210 | ||
211 | ||
212 | class _LttngLiveViewerGetNextDataStreamIndexEntryReply: | |
213 | class Status: | |
214 | OK = 1 | |
215 | RETRY = 2 | |
216 | HUP = 3 | |
217 | ERROR = 4 | |
218 | INACTIVE = 5 | |
219 | EOF = 6 | |
220 | ||
221 | def __init__(self, status, index_entry, has_new_metadata, has_new_data_stream): | |
222 | self._status = status | |
223 | self._index_entry = index_entry | |
224 | self._has_new_metadata = has_new_metadata | |
225 | self._has_new_data_stream = has_new_data_stream | |
226 | ||
227 | @property | |
228 | def status(self): | |
229 | return self._status | |
230 | ||
231 | @property | |
232 | def index_entry(self): | |
233 | return self._index_entry | |
234 | ||
235 | @property | |
236 | def has_new_metadata(self): | |
237 | return self._has_new_metadata | |
238 | ||
239 | @property | |
240 | def has_new_data_stream(self): | |
241 | return self._has_new_data_stream | |
242 | ||
243 | ||
244 | class _LttngLiveViewerGetDataStreamPacketDataCommand(_LttngLiveViewerCommand): | |
245 | def __init__(self, version, stream_id, offset, req_length): | |
246 | super().__init__(version) | |
247 | self._stream_id = stream_id | |
248 | self._offset = offset | |
249 | self._req_length = req_length | |
250 | ||
251 | @property | |
252 | def stream_id(self): | |
253 | return self._stream_id | |
254 | ||
255 | @property | |
256 | def offset(self): | |
257 | return self._offset | |
258 | ||
259 | @property | |
260 | def req_length(self): | |
261 | return self._req_length | |
262 | ||
263 | ||
264 | class _LttngLiveViewerGetDataStreamPacketDataReply: | |
265 | class Status: | |
266 | OK = 1 | |
267 | RETRY = 2 | |
268 | ERROR = 3 | |
269 | EOF = 4 | |
270 | ||
271 | def __init__(self, status, data, has_new_metadata, has_new_data_stream): | |
272 | self._status = status | |
273 | self._data = data | |
274 | self._has_new_metadata = has_new_metadata | |
275 | self._has_new_data_stream = has_new_data_stream | |
276 | ||
277 | @property | |
278 | def status(self): | |
279 | return self._status | |
280 | ||
281 | @property | |
282 | def data(self): | |
283 | return self._data | |
284 | ||
285 | @property | |
286 | def has_new_metadata(self): | |
287 | return self._has_new_metadata | |
288 | ||
289 | @property | |
290 | def has_new_data_stream(self): | |
291 | return self._has_new_data_stream | |
292 | ||
293 | ||
294 | class _LttngLiveViewerGetMetadataStreamDataCommand(_LttngLiveViewerCommand): | |
295 | def __init__(self, version, stream_id): | |
296 | super().__init__(version) | |
297 | self._stream_id = stream_id | |
298 | ||
299 | @property | |
300 | def stream_id(self): | |
301 | return self._stream_id | |
302 | ||
303 | ||
304 | class _LttngLiveViewerGetMetadataStreamDataContentReply: | |
305 | class Status: | |
306 | OK = 1 | |
307 | NO_NEW = 2 | |
308 | ERROR = 3 | |
309 | ||
310 | def __init__(self, status, data): | |
311 | self._status = status | |
312 | self._data = data | |
313 | ||
314 | @property | |
315 | def status(self): | |
316 | return self._status | |
317 | ||
318 | @property | |
319 | def data(self): | |
320 | return self._data | |
321 | ||
322 | ||
323 | class _LttngLiveViewerGetNewStreamInfosCommand(_LttngLiveViewerCommand): | |
324 | def __init__(self, version, tracing_session_id): | |
325 | super().__init__(version) | |
326 | self._tracing_session_id = tracing_session_id | |
327 | ||
328 | @property | |
329 | def tracing_session_id(self): | |
330 | return self._tracing_session_id | |
331 | ||
332 | ||
333 | class _LttngLiveViewerGetNewStreamInfosReply: | |
334 | class Status: | |
335 | OK = 1 | |
336 | NO_NEW = 2 | |
337 | ERROR = 3 | |
338 | HUP = 4 | |
339 | ||
340 | def __init__(self, status, stream_infos): | |
341 | self._status = status | |
342 | self._stream_infos = stream_infos | |
343 | ||
344 | @property | |
345 | def status(self): | |
346 | return self._status | |
347 | ||
348 | @property | |
349 | def stream_infos(self): | |
350 | return self._stream_infos | |
351 | ||
352 | ||
353 | class _LttngLiveViewerCreateViewerSessionCommand(_LttngLiveViewerCommand): | |
354 | pass | |
355 | ||
356 | ||
357 | class _LttngLiveViewerCreateViewerSessionReply: | |
358 | class Status: | |
359 | OK = 1 | |
360 | ERROR = 2 | |
361 | ||
362 | def __init__(self, status): | |
363 | self._status = status | |
364 | ||
365 | @property | |
366 | def status(self): | |
367 | return self._status | |
368 | ||
369 | ||
370 | class _LttngLiveViewerDetachFromTracingSessionCommand(_LttngLiveViewerCommand): | |
371 | def __init__(self, version, tracing_session_id): | |
372 | super().__init__(version) | |
373 | self._tracing_session_id = tracing_session_id | |
374 | ||
375 | @property | |
376 | def tracing_session_id(self): | |
377 | return self._tracing_session_id | |
378 | ||
379 | ||
380 | class _LttngLiveViewerDetachFromTracingSessionReply: | |
381 | class Status: | |
382 | OK = 1 | |
383 | UNKNOWN = 2 | |
384 | ERROR = 3 | |
385 | ||
386 | def __init__(self, status): | |
387 | self._status = status | |
388 | ||
389 | @property | |
390 | def status(self): | |
391 | return self._status | |
392 | ||
393 | ||
394 | # An LTTng live protocol codec can convert bytes to command objects and | |
395 | # reply objects to bytes. | |
396 | class _LttngLiveViewerProtocolCodec: | |
f5567ea8 | 397 | _COMMAND_HEADER_STRUCT_FMT = "QII" |
584af91e PP |
398 | _COMMAND_HEADER_SIZE_BYTES = struct.calcsize(_COMMAND_HEADER_STRUCT_FMT) |
399 | ||
400 | def __init__(self): | |
401 | pass | |
402 | ||
403 | def _unpack(self, fmt, data, offset=0): | |
f5567ea8 | 404 | fmt = "!" + fmt |
584af91e PP |
405 | return struct.unpack_from(fmt, data, offset) |
406 | ||
407 | def _unpack_payload(self, fmt, data): | |
408 | return self._unpack( | |
409 | fmt, data, _LttngLiveViewerProtocolCodec._COMMAND_HEADER_SIZE_BYTES | |
410 | ) | |
411 | ||
412 | def decode(self, data): | |
413 | if len(data) < self._COMMAND_HEADER_SIZE_BYTES: | |
414 | # Not enough data to read the command header | |
415 | return | |
416 | ||
417 | payload_size, cmd_type, version = self._unpack( | |
418 | self._COMMAND_HEADER_STRUCT_FMT, data | |
419 | ) | |
420 | logging.info( | |
f5567ea8 | 421 | "Decoded command header: payload-size={}, cmd-type={}, version={}".format( |
584af91e PP |
422 | payload_size, cmd_type, version |
423 | ) | |
424 | ) | |
425 | ||
426 | if len(data) < self._COMMAND_HEADER_SIZE_BYTES + payload_size: | |
427 | # Not enough data to read the whole command | |
428 | return | |
429 | ||
430 | if cmd_type == 1: | |
431 | viewer_session_id, major, minor, conn_type = self._unpack_payload( | |
f5567ea8 | 432 | "QIII", data |
584af91e PP |
433 | ) |
434 | return _LttngLiveViewerConnectCommand( | |
435 | version, viewer_session_id, major, minor | |
436 | ) | |
437 | elif cmd_type == 2: | |
438 | return _LttngLiveViewerGetTracingSessionInfosCommand(version) | |
439 | elif cmd_type == 3: | |
f5567ea8 | 440 | tracing_session_id, offset, seek_type = self._unpack_payload("QQI", data) |
584af91e PP |
441 | return _LttngLiveViewerAttachToTracingSessionCommand( |
442 | version, tracing_session_id, offset, seek_type | |
443 | ) | |
444 | elif cmd_type == 4: | |
f5567ea8 | 445 | (stream_id,) = self._unpack_payload("Q", data) |
584af91e PP |
446 | return _LttngLiveViewerGetNextDataStreamIndexEntryCommand( |
447 | version, stream_id | |
448 | ) | |
449 | elif cmd_type == 5: | |
f5567ea8 | 450 | stream_id, offset, req_length = self._unpack_payload("QQI", data) |
584af91e PP |
451 | return _LttngLiveViewerGetDataStreamPacketDataCommand( |
452 | version, stream_id, offset, req_length | |
453 | ) | |
454 | elif cmd_type == 6: | |
f5567ea8 | 455 | (stream_id,) = self._unpack_payload("Q", data) |
584af91e PP |
456 | return _LttngLiveViewerGetMetadataStreamDataCommand(version, stream_id) |
457 | elif cmd_type == 7: | |
f5567ea8 | 458 | (tracing_session_id,) = self._unpack_payload("Q", data) |
584af91e PP |
459 | return _LttngLiveViewerGetNewStreamInfosCommand(version, tracing_session_id) |
460 | elif cmd_type == 8: | |
461 | return _LttngLiveViewerCreateViewerSessionCommand(version) | |
462 | elif cmd_type == 9: | |
f5567ea8 | 463 | (tracing_session_id,) = self._unpack_payload("Q", data) |
584af91e PP |
464 | return _LttngLiveViewerDetachFromTracingSessionCommand( |
465 | version, tracing_session_id | |
466 | ) | |
467 | else: | |
f5567ea8 | 468 | raise UnexpectedInput("Unknown command type {}".format(cmd_type)) |
584af91e PP |
469 | |
470 | def _pack(self, fmt, *args): | |
471 | # Force network byte order | |
f5567ea8 | 472 | return struct.pack("!" + fmt, *args) |
584af91e PP |
473 | |
474 | def _encode_zero_padded_str(self, string, length): | |
475 | data = string.encode() | |
f5567ea8 | 476 | return data.ljust(length, b"\x00") |
584af91e PP |
477 | |
478 | def _encode_stream_info(self, info): | |
f5567ea8 | 479 | data = self._pack("QQI", info.id, info.trace_id, int(info.is_metadata)) |
584af91e PP |
480 | data += self._encode_zero_padded_str(info.path, 4096) |
481 | data += self._encode_zero_padded_str(info.channel_name, 255) | |
482 | return data | |
483 | ||
484 | def _get_has_new_stuff_flags(self, has_new_metadata, has_new_data_streams): | |
485 | flags = 0 | |
486 | ||
487 | if has_new_metadata: | |
488 | flags |= 1 | |
489 | ||
490 | if has_new_data_streams: | |
491 | flags |= 2 | |
492 | ||
493 | return flags | |
494 | ||
495 | def encode(self, reply): | |
496 | if type(reply) is _LttngLiveViewerConnectReply: | |
497 | data = self._pack( | |
f5567ea8 | 498 | "QIII", reply.viewer_session_id, reply.major, reply.minor, 2 |
584af91e PP |
499 | ) |
500 | elif type(reply) is _LttngLiveViewerGetTracingSessionInfosReply: | |
f5567ea8 | 501 | data = self._pack("I", len(reply.tracing_session_infos)) |
584af91e PP |
502 | |
503 | for info in reply.tracing_session_infos: | |
504 | data += self._pack( | |
f5567ea8 | 505 | "QIII", |
584af91e PP |
506 | info.tracing_session_id, |
507 | info.live_timer_freq, | |
508 | info.client_count, | |
509 | info.stream_count, | |
510 | ) | |
511 | data += self._encode_zero_padded_str(info.hostname, 64) | |
512 | data += self._encode_zero_padded_str(info.name, 255) | |
513 | elif type(reply) is _LttngLiveViewerAttachToTracingSessionReply: | |
f5567ea8 | 514 | data = self._pack("II", reply.status, len(reply.stream_infos)) |
584af91e PP |
515 | |
516 | for info in reply.stream_infos: | |
517 | data += self._encode_stream_info(info) | |
518 | elif type(reply) is _LttngLiveViewerGetNextDataStreamIndexEntryReply: | |
f5567ea8 | 519 | index_format = "QQQQQQQII" |
584af91e PP |
520 | entry = reply.index_entry |
521 | flags = self._get_has_new_stuff_flags( | |
522 | reply.has_new_metadata, reply.has_new_data_stream | |
523 | ) | |
524 | ||
71f56e5f JG |
525 | if type(entry) is _LttngDataStreamIndexEntry: |
526 | data = self._pack( | |
527 | index_format, | |
528 | entry.offset_bytes, | |
529 | entry.total_size_bits, | |
530 | entry.content_size_bits, | |
531 | entry.timestamp_begin, | |
532 | entry.timestamp_end, | |
533 | entry.events_discarded, | |
534 | entry.stream_class_id, | |
535 | reply.status, | |
536 | flags, | |
537 | ) | |
538 | else: | |
539 | assert type(entry) is _LttngDataStreamBeaconEntry | |
540 | data = self._pack( | |
541 | index_format, | |
542 | 0, | |
543 | 0, | |
544 | 0, | |
545 | 0, | |
546 | entry.timestamp, | |
547 | 0, | |
548 | entry.stream_class_id, | |
549 | reply.status, | |
550 | flags, | |
551 | ) | |
584af91e PP |
552 | elif type(reply) is _LttngLiveViewerGetDataStreamPacketDataReply: |
553 | flags = self._get_has_new_stuff_flags( | |
554 | reply.has_new_metadata, reply.has_new_data_stream | |
555 | ) | |
f5567ea8 | 556 | data = self._pack("III", reply.status, len(reply.data), flags) |
584af91e PP |
557 | data += reply.data |
558 | elif type(reply) is _LttngLiveViewerGetMetadataStreamDataContentReply: | |
f5567ea8 | 559 | data = self._pack("QI", len(reply.data), reply.status) |
584af91e PP |
560 | data += reply.data |
561 | elif type(reply) is _LttngLiveViewerGetNewStreamInfosReply: | |
f5567ea8 | 562 | data = self._pack("II", reply.status, len(reply.stream_infos)) |
584af91e PP |
563 | |
564 | for info in reply.stream_infos: | |
565 | data += self._encode_stream_info(info) | |
566 | elif type(reply) is _LttngLiveViewerCreateViewerSessionReply: | |
f5567ea8 | 567 | data = self._pack("I", reply.status) |
584af91e | 568 | elif type(reply) is _LttngLiveViewerDetachFromTracingSessionReply: |
f5567ea8 | 569 | data = self._pack("I", reply.status) |
584af91e PP |
570 | else: |
571 | raise ValueError( | |
f5567ea8 | 572 | "Unknown reply object with class `{}`".format(reply.__class__.__name__) |
584af91e PP |
573 | ) |
574 | ||
575 | return data | |
576 | ||
577 | ||
578 | # An entry within the index of an LTTng data stream. | |
579 | class _LttngDataStreamIndexEntry: | |
580 | def __init__( | |
581 | self, | |
582 | offset_bytes, | |
583 | total_size_bits, | |
584 | content_size_bits, | |
585 | timestamp_begin, | |
586 | timestamp_end, | |
587 | events_discarded, | |
588 | stream_class_id, | |
589 | ): | |
590 | self._offset_bytes = offset_bytes | |
591 | self._total_size_bits = total_size_bits | |
592 | self._content_size_bits = content_size_bits | |
593 | self._timestamp_begin = timestamp_begin | |
594 | self._timestamp_end = timestamp_end | |
595 | self._events_discarded = events_discarded | |
596 | self._stream_class_id = stream_class_id | |
597 | ||
598 | @property | |
599 | def offset_bytes(self): | |
600 | return self._offset_bytes | |
601 | ||
602 | @property | |
603 | def total_size_bits(self): | |
604 | return self._total_size_bits | |
605 | ||
606 | @property | |
607 | def total_size_bytes(self): | |
608 | return self._total_size_bits // 8 | |
609 | ||
610 | @property | |
611 | def content_size_bits(self): | |
612 | return self._content_size_bits | |
613 | ||
614 | @property | |
615 | def content_size_bytes(self): | |
616 | return self._content_size_bits // 8 | |
617 | ||
618 | @property | |
619 | def timestamp_begin(self): | |
620 | return self._timestamp_begin | |
621 | ||
622 | @property | |
623 | def timestamp_end(self): | |
624 | return self._timestamp_end | |
625 | ||
626 | @property | |
627 | def events_discarded(self): | |
628 | return self._events_discarded | |
629 | ||
630 | @property | |
631 | def stream_class_id(self): | |
632 | return self._stream_class_id | |
633 | ||
634 | ||
71f56e5f JG |
635 | # An entry within the index of an LTTng data stream. While a stream beacon entry |
636 | # is conceptually unrelated to an index, it is sent as a reply to a | |
637 | # LttngLiveViewerGetNextDataStreamIndexEntryCommand | |
638 | class _LttngDataStreamBeaconEntry: | |
639 | def __init__(self, stream_class_id, timestamp): | |
640 | self._stream_class_id = stream_class_id | |
641 | self._timestamp = timestamp | |
642 | ||
643 | @property | |
644 | def timestamp(self): | |
645 | return self._timestamp | |
646 | ||
647 | @property | |
648 | def stream_class_id(self): | |
649 | return self._stream_class_id | |
650 | ||
651 | ||
78169723 FD |
652 | def _get_entry_timestamp_begin(entry): |
653 | if type(entry) is _LttngDataStreamBeaconEntry: | |
654 | return entry.timestamp | |
655 | else: | |
656 | assert type(entry) is _LttngDataStreamIndexEntry | |
657 | return entry.timestamp_begin | |
658 | ||
659 | ||
584af91e PP |
660 | # The index of an LTTng data stream, a sequence of index entries. |
661 | class _LttngDataStreamIndex(collections.abc.Sequence): | |
71f56e5f | 662 | def __init__(self, path, beacons): |
584af91e PP |
663 | self._path = path |
664 | self._build() | |
71f56e5f JG |
665 | |
666 | if beacons: | |
667 | stream_class_id = self._entries[0].stream_class_id | |
668 | beacons = [ | |
669 | _LttngDataStreamBeaconEntry(stream_class_id, ts) for ts in beacons | |
670 | ] | |
671 | self._add_beacons(beacons) | |
672 | ||
584af91e PP |
673 | logging.info( |
674 | 'Built data stream index entries: path="{}", count={}'.format( | |
675 | path, len(self._entries) | |
676 | ) | |
677 | ) | |
678 | ||
679 | def _build(self): | |
680 | self._entries = [] | |
681 | assert os.path.isfile(self._path) | |
682 | ||
f5567ea8 | 683 | with open(self._path, "rb") as f: |
584af91e | 684 | # Read header first |
f5567ea8 | 685 | fmt = ">IIII" |
584af91e PP |
686 | size = struct.calcsize(fmt) |
687 | data = f.read(size) | |
688 | assert len(data) == size | |
689 | magic, index_major, index_minor, index_entry_length = struct.unpack( | |
690 | fmt, data | |
691 | ) | |
692 | assert magic == 0xC1F1DCC1 | |
693 | ||
694 | # Read index entries | |
f5567ea8 | 695 | fmt = ">QQQQQQQ" |
584af91e PP |
696 | size = struct.calcsize(fmt) |
697 | ||
698 | while True: | |
699 | logging.debug( | |
700 | 'Decoding data stream index entry: path="{}", offset={}'.format( | |
701 | self._path, f.tell() | |
702 | ) | |
703 | ) | |
704 | data = f.read(size) | |
705 | ||
706 | if not data: | |
707 | # Done | |
708 | break | |
709 | ||
710 | assert len(data) == size | |
75882e97 FD |
711 | ( |
712 | offset_bytes, | |
713 | total_size_bits, | |
714 | content_size_bits, | |
715 | timestamp_begin, | |
716 | timestamp_end, | |
717 | events_discarded, | |
718 | stream_class_id, | |
719 | ) = struct.unpack(fmt, data) | |
584af91e PP |
720 | |
721 | self._entries.append( | |
722 | _LttngDataStreamIndexEntry( | |
723 | offset_bytes, | |
724 | total_size_bits, | |
725 | content_size_bits, | |
726 | timestamp_begin, | |
727 | timestamp_end, | |
728 | events_discarded, | |
729 | stream_class_id, | |
730 | ) | |
731 | ) | |
732 | ||
733 | # Skip anything else before the next entry | |
734 | f.seek(index_entry_length - size, os.SEEK_CUR) | |
735 | ||
71f56e5f JG |
736 | def _add_beacons(self, beacons): |
737 | # Assumes entries[n + 1].timestamp_end >= entries[n].timestamp_begin | |
738 | def sort_key(entry): | |
739 | if type(entry) is _LttngDataStreamBeaconEntry: | |
740 | return entry.timestamp | |
741 | else: | |
742 | return entry.timestamp_end | |
743 | ||
744 | self._entries += beacons | |
745 | self._entries.sort(key=sort_key) | |
746 | ||
584af91e PP |
747 | def __getitem__(self, index): |
748 | return self._entries[index] | |
749 | ||
750 | def __len__(self): | |
751 | return len(self._entries) | |
752 | ||
753 | @property | |
754 | def path(self): | |
755 | return self._path | |
756 | ||
757 | ||
758 | # An LTTng data stream. | |
759 | class _LttngDataStream: | |
71f56e5f | 760 | def __init__(self, path, beacons): |
584af91e PP |
761 | self._path = path |
762 | filename = os.path.basename(path) | |
f5567ea8 | 763 | match = re.match(r"(.*)_\d+", filename) |
584af91e PP |
764 | self._channel_name = match.group(1) |
765 | trace_dir = os.path.dirname(path) | |
f5567ea8 | 766 | index_path = os.path.join(trace_dir, "index", filename + ".idx") |
71f56e5f | 767 | self._index = _LttngDataStreamIndex(index_path, beacons) |
584af91e | 768 | assert os.path.isfile(path) |
f5567ea8 | 769 | self._file = open(path, "rb") |
584af91e PP |
770 | logging.info( |
771 | 'Built data stream: path="{}", channel-name="{}"'.format( | |
772 | path, self._channel_name | |
773 | ) | |
774 | ) | |
775 | ||
776 | @property | |
777 | def path(self): | |
778 | return self._path | |
779 | ||
780 | @property | |
781 | def channel_name(self): | |
782 | return self._channel_name | |
783 | ||
784 | @property | |
785 | def index(self): | |
786 | return self._index | |
787 | ||
788 | def get_data(self, offset_bytes, len_bytes): | |
789 | self._file.seek(offset_bytes) | |
790 | return self._file.read(len_bytes) | |
791 | ||
792 | ||
78169723 FD |
793 | class _LttngMetadataStreamSection: |
794 | def __init__(self, timestamp, data): | |
795 | self._timestamp = timestamp | |
796 | if data is None: | |
797 | self._data = bytes() | |
798 | else: | |
799 | self._data = data | |
800 | logging.info( | |
f5567ea8 | 801 | "Built metadata stream section: ts={}, data-len={}".format( |
78169723 FD |
802 | self._timestamp, len(self._data) |
803 | ) | |
804 | ) | |
805 | ||
806 | @property | |
807 | def timestamp(self): | |
808 | return self._timestamp | |
809 | ||
810 | @property | |
811 | def data(self): | |
812 | return self._data | |
813 | ||
814 | ||
584af91e PP |
815 | # An LTTng metadata stream. |
816 | class _LttngMetadataStream: | |
78169723 FD |
817 | def __init__(self, metadata_file_path, config_sections): |
818 | self._path = metadata_file_path | |
819 | self._sections = config_sections | |
820 | logging.info( | |
f5567ea8 | 821 | "Built metadata stream: path={}, section-len={}".format( |
78169723 FD |
822 | self._path, len(self._sections) |
823 | ) | |
824 | ) | |
584af91e PP |
825 | |
826 | @property | |
827 | def path(self): | |
828 | return self._path | |
829 | ||
830 | @property | |
78169723 FD |
831 | def sections(self): |
832 | return self._sections | |
584af91e | 833 | |
78169723 FD |
834 | |
835 | LttngMetadataConfigSection = namedtuple( | |
f5567ea8 | 836 | "LttngMetadataConfigSection", ["line", "timestamp", "is_empty"] |
78169723 FD |
837 | ) |
838 | ||
839 | ||
840 | def _parse_metadata_sections_config(config_sections): | |
841 | assert config_sections is not None | |
842 | config_metadata_sections = [] | |
843 | append_empty_section = False | |
844 | last_timestamp = 0 | |
845 | last_line = 0 | |
846 | ||
847 | for config_section in config_sections: | |
f5567ea8 | 848 | if config_section == "empty": |
78169723 FD |
849 | # Found a empty section marker. Actually append the section at the |
850 | # timestamp of the next concrete section. | |
851 | append_empty_section = True | |
852 | else: | |
853 | assert type(config_section) is dict | |
f5567ea8 FD |
854 | line = config_section.get("line") |
855 | ts = config_section.get("timestamp") | |
78169723 FD |
856 | |
857 | # Sections' timestamps and lines must both be increasing. | |
858 | assert ts > last_timestamp | |
859 | last_timestamp = ts | |
860 | assert line > last_line | |
861 | last_line = line | |
862 | ||
863 | if append_empty_section: | |
864 | config_metadata_sections.append( | |
865 | LttngMetadataConfigSection(line, ts, True) | |
866 | ) | |
867 | append_empty_section = False | |
868 | ||
869 | config_metadata_sections.append(LttngMetadataConfigSection(line, ts, False)) | |
870 | ||
871 | return config_metadata_sections | |
872 | ||
873 | ||
874 | def _split_metadata_sections(metadata_file_path, raw_config_sections): | |
875 | assert isinstance(raw_config_sections, collections.abc.Sequence) | |
876 | ||
877 | parsed_sections = _parse_metadata_sections_config(raw_config_sections) | |
878 | ||
879 | sections = [] | |
f5567ea8 | 880 | with open(metadata_file_path, "r") as metadata_file: |
78169723 FD |
881 | metadata_lines = [line for line in metadata_file] |
882 | ||
883 | config_metadata_sections_idx = 0 | |
884 | curr_metadata_section = bytearray() | |
885 | ||
886 | for idx, line_content in enumerate(metadata_lines): | |
887 | # Add one to the index to convert from the zero-indexing of the | |
888 | # enumerate() function to the one-indexing used by humans when | |
889 | # viewing a text file. | |
890 | curr_line_number = idx + 1 | |
891 | ||
892 | # If there are no more sections, simply append the line. | |
893 | if config_metadata_sections_idx + 1 >= len(parsed_sections): | |
f5567ea8 | 894 | curr_metadata_section += bytearray(line_content, "utf8") |
78169723 FD |
895 | continue |
896 | ||
897 | next_section_line_number = parsed_sections[ | |
898 | config_metadata_sections_idx + 1 | |
899 | ].line | |
900 | ||
901 | # If the next section begins at the current line, create a | |
902 | # section with the metadata we gathered so far. | |
903 | if curr_line_number >= next_section_line_number: | |
78169723 FD |
904 | # Flushing the metadata of the current section. |
905 | sections.append( | |
906 | _LttngMetadataStreamSection( | |
907 | parsed_sections[config_metadata_sections_idx].timestamp, | |
908 | bytes(curr_metadata_section), | |
909 | ) | |
910 | ) | |
911 | ||
912 | # Move to the next section. | |
913 | config_metadata_sections_idx += 1 | |
914 | ||
915 | # Clear old content and append current line for the next section. | |
916 | curr_metadata_section.clear() | |
f5567ea8 | 917 | curr_metadata_section += bytearray(line_content, "utf8") |
78169723 FD |
918 | |
919 | # Append any empty sections. | |
920 | while parsed_sections[config_metadata_sections_idx].is_empty: | |
921 | sections.append( | |
922 | _LttngMetadataStreamSection( | |
923 | parsed_sections[config_metadata_sections_idx].timestamp, None | |
924 | ) | |
925 | ) | |
926 | config_metadata_sections_idx += 1 | |
927 | else: | |
928 | # Append line_content to the current metadata section. | |
f5567ea8 | 929 | curr_metadata_section += bytearray(line_content, "utf8") |
78169723 FD |
930 | |
931 | # We iterated over all the lines of the metadata file. Close the current section. | |
932 | sections.append( | |
933 | _LttngMetadataStreamSection( | |
934 | parsed_sections[config_metadata_sections_idx].timestamp, | |
935 | bytes(curr_metadata_section), | |
936 | ) | |
937 | ) | |
938 | ||
939 | return sections | |
584af91e PP |
940 | |
941 | ||
942 | # An LTTng trace, a sequence of LTTng data streams. | |
943 | class LttngTrace(collections.abc.Sequence): | |
78169723 | 944 | def __init__(self, trace_dir, metadata_sections, beacons): |
584af91e PP |
945 | assert os.path.isdir(trace_dir) |
946 | self._path = trace_dir | |
78169723 | 947 | self._create_metadata_stream(trace_dir, metadata_sections) |
71f56e5f | 948 | self._create_data_streams(trace_dir, beacons) |
584af91e PP |
949 | logging.info('Built trace: path="{}"'.format(trace_dir)) |
950 | ||
71f56e5f | 951 | def _create_data_streams(self, trace_dir, beacons): |
584af91e PP |
952 | data_stream_paths = [] |
953 | ||
954 | for filename in os.listdir(trace_dir): | |
955 | path = os.path.join(trace_dir, filename) | |
956 | ||
957 | if not os.path.isfile(path): | |
958 | continue | |
959 | ||
f5567ea8 | 960 | if filename.startswith("."): |
584af91e PP |
961 | continue |
962 | ||
f5567ea8 | 963 | if filename == "metadata": |
584af91e PP |
964 | continue |
965 | ||
966 | data_stream_paths.append(path) | |
967 | ||
968 | data_stream_paths.sort() | |
969 | self._data_streams = [] | |
970 | ||
971 | for data_stream_path in data_stream_paths: | |
71f56e5f JG |
972 | stream_name = os.path.basename(data_stream_path) |
973 | this_stream_beacons = None | |
974 | ||
975 | if beacons is not None and stream_name in beacons: | |
976 | this_stream_beacons = beacons[stream_name] | |
977 | ||
978 | self._data_streams.append( | |
979 | _LttngDataStream(data_stream_path, this_stream_beacons) | |
980 | ) | |
584af91e | 981 | |
78169723 | 982 | def _create_metadata_stream(self, trace_dir, config_metadata_sections): |
f5567ea8 | 983 | metadata_path = os.path.join(trace_dir, "metadata") |
78169723 FD |
984 | metadata_sections = [] |
985 | ||
986 | if config_metadata_sections is None: | |
f5567ea8 | 987 | with open(metadata_path, "rb") as metadata_file: |
78169723 FD |
988 | metadata_sections.append( |
989 | _LttngMetadataStreamSection(0, metadata_file.read()) | |
990 | ) | |
991 | else: | |
992 | metadata_sections = _split_metadata_sections( | |
993 | metadata_path, config_metadata_sections | |
994 | ) | |
995 | ||
996 | self._metadata_stream = _LttngMetadataStream(metadata_path, metadata_sections) | |
997 | ||
584af91e PP |
998 | @property |
999 | def path(self): | |
1000 | return self._path | |
1001 | ||
1002 | @property | |
1003 | def metadata_stream(self): | |
1004 | return self._metadata_stream | |
1005 | ||
1006 | def __getitem__(self, index): | |
1007 | return self._data_streams[index] | |
1008 | ||
1009 | def __len__(self): | |
1010 | return len(self._data_streams) | |
1011 | ||
1012 | ||
1013 | # The state of a single data stream. | |
1014 | class _LttngLiveViewerSessionDataStreamState: | |
78169723 | 1015 | def __init__(self, ts_state, info, data_stream, metadata_stream_id): |
584af91e PP |
1016 | self._ts_state = ts_state |
1017 | self._info = info | |
1018 | self._data_stream = data_stream | |
78169723 | 1019 | self._metadata_stream_id = metadata_stream_id |
584af91e PP |
1020 | self._cur_index_entry_index = 0 |
1021 | fmt = 'Built data stream state: id={}, ts-id={}, ts-name="{}", path="{}"' | |
1022 | logging.info( | |
1023 | fmt.format( | |
1024 | info.id, | |
1025 | ts_state.tracing_session_descriptor.info.tracing_session_id, | |
1026 | ts_state.tracing_session_descriptor.info.name, | |
1027 | data_stream.path, | |
1028 | ) | |
1029 | ) | |
1030 | ||
1031 | @property | |
1032 | def tracing_session_state(self): | |
1033 | return self._ts_state | |
1034 | ||
1035 | @property | |
1036 | def info(self): | |
1037 | return self._info | |
1038 | ||
1039 | @property | |
1040 | def data_stream(self): | |
1041 | return self._data_stream | |
1042 | ||
1043 | @property | |
1044 | def cur_index_entry(self): | |
1045 | if self._cur_index_entry_index == len(self._data_stream.index): | |
1046 | return | |
1047 | ||
1048 | return self._data_stream.index[self._cur_index_entry_index] | |
1049 | ||
1050 | def goto_next_index_entry(self): | |
1051 | self._cur_index_entry_index += 1 | |
1052 | ||
1053 | ||
1054 | # The state of a single metadata stream. | |
1055 | class _LttngLiveViewerSessionMetadataStreamState: | |
1056 | def __init__(self, ts_state, info, metadata_stream): | |
1057 | self._ts_state = ts_state | |
1058 | self._info = info | |
1059 | self._metadata_stream = metadata_stream | |
78169723 FD |
1060 | self._cur_metadata_stream_section_index = 0 |
1061 | if len(metadata_stream.sections) > 1: | |
1062 | self._next_metadata_stream_section_timestamp = metadata_stream.sections[ | |
1063 | 1 | |
1064 | ].timestamp | |
1065 | else: | |
1066 | self._next_metadata_stream_section_timestamp = None | |
1067 | ||
584af91e PP |
1068 | self._is_sent = False |
1069 | fmt = 'Built metadata stream state: id={}, ts-id={}, ts-name="{}", path="{}"' | |
1070 | logging.info( | |
1071 | fmt.format( | |
1072 | info.id, | |
1073 | ts_state.tracing_session_descriptor.info.tracing_session_id, | |
1074 | ts_state.tracing_session_descriptor.info.name, | |
1075 | metadata_stream.path, | |
1076 | ) | |
1077 | ) | |
1078 | ||
1079 | @property | |
1080 | def trace_session_state(self): | |
1081 | return self._trace_session_state | |
1082 | ||
1083 | @property | |
1084 | def info(self): | |
1085 | return self._info | |
1086 | ||
1087 | @property | |
1088 | def metadata_stream(self): | |
1089 | return self._metadata_stream | |
1090 | ||
1091 | @property | |
1092 | def is_sent(self): | |
1093 | return self._is_sent | |
1094 | ||
1095 | @is_sent.setter | |
1096 | def is_sent(self, value): | |
1097 | self._is_sent = value | |
1098 | ||
78169723 FD |
1099 | @property |
1100 | def cur_section(self): | |
1101 | fmt = "Get current metadata section: section-idx={}" | |
1102 | logging.info(fmt.format(self._cur_metadata_stream_section_index)) | |
1103 | if self._cur_metadata_stream_section_index == len( | |
1104 | self._metadata_stream.sections | |
1105 | ): | |
1106 | return | |
1107 | ||
1108 | return self._metadata_stream.sections[self._cur_metadata_stream_section_index] | |
1109 | ||
1110 | def goto_next_section(self): | |
1111 | self._cur_metadata_stream_section_index += 1 | |
1112 | if self.cur_section: | |
1113 | self._next_metadata_stream_section_timestamp = self.cur_section.timestamp | |
1114 | else: | |
1115 | self._next_metadata_stream_section_timestamp = None | |
1116 | ||
1117 | @property | |
1118 | def next_section_timestamp(self): | |
1119 | return self._next_metadata_stream_section_timestamp | |
1120 | ||
584af91e PP |
1121 | |
1122 | # The state of a tracing session. | |
1123 | class _LttngLiveViewerSessionTracingSessionState: | |
1124 | def __init__(self, tc_descr, base_stream_id): | |
1125 | self._tc_descr = tc_descr | |
1126 | self._stream_infos = [] | |
1127 | self._ds_states = {} | |
1128 | self._ms_states = {} | |
1129 | stream_id = base_stream_id | |
1130 | ||
1131 | for trace in tc_descr.traces: | |
1132 | trace_id = stream_id * 1000 | |
1133 | ||
78169723 FD |
1134 | # Metadata stream -> stream info and metadata stream state |
1135 | info = _LttngLiveViewerStreamInfo( | |
f5567ea8 | 1136 | stream_id, trace_id, True, trace.metadata_stream.path, "metadata" |
78169723 FD |
1137 | ) |
1138 | self._stream_infos.append(info) | |
1139 | self._ms_states[stream_id] = _LttngLiveViewerSessionMetadataStreamState( | |
1140 | self, info, trace.metadata_stream | |
1141 | ) | |
1142 | metadata_stream_id = stream_id | |
1143 | stream_id += 1 | |
1144 | ||
584af91e PP |
1145 | # Data streams -> stream infos and data stream states |
1146 | for data_stream in trace: | |
1147 | info = _LttngLiveViewerStreamInfo( | |
1148 | stream_id, | |
1149 | trace_id, | |
1150 | False, | |
1151 | data_stream.path, | |
1152 | data_stream.channel_name, | |
1153 | ) | |
1154 | self._stream_infos.append(info) | |
1155 | self._ds_states[stream_id] = _LttngLiveViewerSessionDataStreamState( | |
78169723 | 1156 | self, info, data_stream, metadata_stream_id |
584af91e PP |
1157 | ) |
1158 | stream_id += 1 | |
1159 | ||
584af91e PP |
1160 | self._is_attached = False |
1161 | fmt = 'Built tracing session state: id={}, name="{}"' | |
1162 | logging.info(fmt.format(tc_descr.info.tracing_session_id, tc_descr.info.name)) | |
1163 | ||
1164 | @property | |
1165 | def tracing_session_descriptor(self): | |
1166 | return self._tc_descr | |
1167 | ||
1168 | @property | |
1169 | def data_stream_states(self): | |
1170 | return self._ds_states | |
1171 | ||
1172 | @property | |
1173 | def metadata_stream_states(self): | |
1174 | return self._ms_states | |
1175 | ||
1176 | @property | |
1177 | def stream_infos(self): | |
1178 | return self._stream_infos | |
1179 | ||
1180 | @property | |
1181 | def has_new_metadata(self): | |
1182 | return any([not ms.is_sent for ms in self._ms_states.values()]) | |
1183 | ||
1184 | @property | |
1185 | def is_attached(self): | |
1186 | return self._is_attached | |
1187 | ||
1188 | @is_attached.setter | |
1189 | def is_attached(self, value): | |
1190 | self._is_attached = value | |
1191 | ||
1192 | ||
78169723 FD |
1193 | def needs_new_metadata_section(metadata_stream_state, latest_timestamp): |
1194 | if metadata_stream_state.next_section_timestamp is None: | |
1195 | return False | |
1196 | ||
1197 | if latest_timestamp >= metadata_stream_state.next_section_timestamp: | |
1198 | return True | |
1199 | else: | |
1200 | return False | |
1201 | ||
1202 | ||
584af91e PP |
1203 | # An LTTng live viewer session manages a view on tracing sessions |
1204 | # and replies to commands accordingly. | |
1205 | class _LttngLiveViewerSession: | |
1206 | def __init__( | |
1207 | self, | |
1208 | viewer_session_id, | |
1209 | tracing_session_descriptors, | |
1210 | max_query_data_response_size, | |
1211 | ): | |
1212 | self._viewer_session_id = viewer_session_id | |
1213 | self._ts_states = {} | |
1214 | self._stream_states = {} | |
1215 | self._max_query_data_response_size = max_query_data_response_size | |
1216 | total_stream_infos = 0 | |
1217 | ||
1218 | for ts_descr in tracing_session_descriptors: | |
1219 | ts_state = _LttngLiveViewerSessionTracingSessionState( | |
1220 | ts_descr, total_stream_infos | |
1221 | ) | |
1222 | ts_id = ts_state.tracing_session_descriptor.info.tracing_session_id | |
1223 | self._ts_states[ts_id] = ts_state | |
1224 | total_stream_infos += len(ts_state.stream_infos) | |
1225 | ||
1226 | # Update session's stream states to have the new states | |
1227 | self._stream_states.update(ts_state.data_stream_states) | |
1228 | self._stream_states.update(ts_state.metadata_stream_states) | |
1229 | ||
1230 | self._command_handlers = { | |
1231 | _LttngLiveViewerAttachToTracingSessionCommand: self._handle_attach_to_tracing_session_command, | |
1232 | _LttngLiveViewerCreateViewerSessionCommand: self._handle_create_viewer_session_command, | |
1233 | _LttngLiveViewerDetachFromTracingSessionCommand: self._handle_detach_from_tracing_session_command, | |
1234 | _LttngLiveViewerGetDataStreamPacketDataCommand: self._handle_get_data_stream_packet_data_command, | |
1235 | _LttngLiveViewerGetMetadataStreamDataCommand: self._handle_get_metadata_stream_data_command, | |
1236 | _LttngLiveViewerGetNewStreamInfosCommand: self._handle_get_new_stream_infos_command, | |
1237 | _LttngLiveViewerGetNextDataStreamIndexEntryCommand: self._handle_get_next_data_stream_index_entry_command, | |
1238 | _LttngLiveViewerGetTracingSessionInfosCommand: self._handle_get_tracing_session_infos_command, | |
1239 | } | |
1240 | ||
1241 | @property | |
1242 | def viewer_session_id(self): | |
1243 | return self._viewer_session_id | |
1244 | ||
1245 | def _get_tracing_session_state(self, tracing_session_id): | |
1246 | if tracing_session_id not in self._ts_states: | |
1247 | raise UnexpectedInput( | |
f5567ea8 | 1248 | "Unknown tracing session ID {}".format(tracing_session_id) |
584af91e PP |
1249 | ) |
1250 | ||
1251 | return self._ts_states[tracing_session_id] | |
1252 | ||
1253 | def _get_stream_state(self, stream_id): | |
1254 | if stream_id not in self._stream_states: | |
f5567ea8 | 1255 | UnexpectedInput("Unknown stream ID {}".format(stream_id)) |
584af91e PP |
1256 | |
1257 | return self._stream_states[stream_id] | |
1258 | ||
1259 | def handle_command(self, cmd): | |
1260 | logging.info( | |
f5567ea8 | 1261 | "Handling command in viewer session: cmd-cls-name={}".format( |
584af91e PP |
1262 | cmd.__class__.__name__ |
1263 | ) | |
1264 | ) | |
1265 | cmd_type = type(cmd) | |
1266 | ||
1267 | if cmd_type not in self._command_handlers: | |
1268 | raise UnexpectedInput( | |
f5567ea8 | 1269 | "Unexpected command: cmd-cls-name={}".format(cmd.__class__.__name__) |
584af91e PP |
1270 | ) |
1271 | ||
1272 | return self._command_handlers[cmd_type](cmd) | |
1273 | ||
1274 | def _handle_attach_to_tracing_session_command(self, cmd): | |
1275 | fmt = 'Handling "attach to tracing session" command: ts-id={}, offset={}, seek-type={}' | |
1276 | logging.info(fmt.format(cmd.tracing_session_id, cmd.offset, cmd.seek_type)) | |
1277 | ts_state = self._get_tracing_session_state(cmd.tracing_session_id) | |
1278 | info = ts_state.tracing_session_descriptor.info | |
1279 | ||
1280 | if ts_state.is_attached: | |
1281 | raise UnexpectedInput( | |
f5567ea8 | 1282 | "Cannot attach to tracing session `{}`: viewer is already attached".format( |
584af91e PP |
1283 | info.name |
1284 | ) | |
1285 | ) | |
1286 | ||
1287 | ts_state.is_attached = True | |
1288 | status = _LttngLiveViewerAttachToTracingSessionReply.Status.OK | |
1289 | return _LttngLiveViewerAttachToTracingSessionReply( | |
1290 | status, ts_state.stream_infos | |
1291 | ) | |
1292 | ||
1293 | def _handle_detach_from_tracing_session_command(self, cmd): | |
1294 | fmt = 'Handling "detach from tracing session" command: ts-id={}' | |
1295 | logging.info(fmt.format(cmd.tracing_session_id)) | |
1296 | ts_state = self._get_tracing_session_state(cmd.tracing_session_id) | |
1297 | info = ts_state.tracing_session_descriptor.info | |
1298 | ||
1299 | if not ts_state.is_attached: | |
1300 | raise UnexpectedInput( | |
f5567ea8 | 1301 | "Cannot detach to tracing session `{}`: viewer is not attached".format( |
584af91e PP |
1302 | info.name |
1303 | ) | |
1304 | ) | |
1305 | ||
1306 | ts_state.is_attached = False | |
1307 | status = _LttngLiveViewerDetachFromTracingSessionReply.Status.OK | |
1308 | return _LttngLiveViewerDetachFromTracingSessionReply(status) | |
1309 | ||
1310 | def _handle_get_next_data_stream_index_entry_command(self, cmd): | |
1311 | fmt = 'Handling "get next data stream index entry" command: stream-id={}' | |
1312 | logging.info(fmt.format(cmd.stream_id)) | |
1313 | stream_state = self._get_stream_state(cmd.stream_id) | |
78169723 | 1314 | metadata_stream_state = self._get_stream_state(stream_state._metadata_stream_id) |
584af91e PP |
1315 | |
1316 | if type(stream_state) is not _LttngLiveViewerSessionDataStreamState: | |
1317 | raise UnexpectedInput( | |
f5567ea8 | 1318 | "Stream with ID {} is not a data stream".format(cmd.stream_id) |
584af91e PP |
1319 | ) |
1320 | ||
1321 | if stream_state.cur_index_entry is None: | |
1322 | # The viewer is done reading this stream | |
1323 | status = _LttngLiveViewerGetNextDataStreamIndexEntryReply.Status.HUP | |
1324 | ||
1325 | # Dummy data stream index entry to use with the `HUP` status | |
1326 | # (the reply needs one, but the viewer ignores it) | |
1327 | index_entry = _LttngDataStreamIndexEntry(0, 0, 0, 0, 0, 0, 0) | |
1328 | ||
1329 | return _LttngLiveViewerGetNextDataStreamIndexEntryReply( | |
1330 | status, index_entry, False, False | |
1331 | ) | |
1332 | ||
78169723 FD |
1333 | timestamp_begin = _get_entry_timestamp_begin(stream_state.cur_index_entry) |
1334 | ||
1335 | if needs_new_metadata_section(metadata_stream_state, timestamp_begin): | |
1336 | metadata_stream_state.is_sent = False | |
1337 | metadata_stream_state.goto_next_section() | |
1338 | ||
584af91e PP |
1339 | # The viewer only checks the `has_new_metadata` flag if the |
1340 | # reply's status is `OK`, so we need to provide an index here | |
1341 | has_new_metadata = stream_state.tracing_session_state.has_new_metadata | |
71f56e5f JG |
1342 | if type(stream_state.cur_index_entry) is _LttngDataStreamIndexEntry: |
1343 | status = _LttngLiveViewerGetNextDataStreamIndexEntryReply.Status.OK | |
1344 | else: | |
1345 | assert type(stream_state.cur_index_entry) is _LttngDataStreamBeaconEntry | |
1346 | status = _LttngLiveViewerGetNextDataStreamIndexEntryReply.Status.INACTIVE | |
1347 | ||
584af91e PP |
1348 | reply = _LttngLiveViewerGetNextDataStreamIndexEntryReply( |
1349 | status, stream_state.cur_index_entry, has_new_metadata, False | |
1350 | ) | |
1351 | stream_state.goto_next_index_entry() | |
1352 | return reply | |
1353 | ||
1354 | def _handle_get_data_stream_packet_data_command(self, cmd): | |
1355 | fmt = 'Handling "get data stream packet data" command: stream-id={}, offset={}, req-length={}' | |
1356 | logging.info(fmt.format(cmd.stream_id, cmd.offset, cmd.req_length)) | |
1357 | stream_state = self._get_stream_state(cmd.stream_id) | |
1358 | data_response_length = cmd.req_length | |
1359 | ||
1360 | if type(stream_state) is not _LttngLiveViewerSessionDataStreamState: | |
1361 | raise UnexpectedInput( | |
f5567ea8 | 1362 | "Stream with ID {} is not a data stream".format(cmd.stream_id) |
584af91e PP |
1363 | ) |
1364 | ||
1365 | if stream_state.tracing_session_state.has_new_metadata: | |
1366 | status = _LttngLiveViewerGetDataStreamPacketDataReply.Status.ERROR | |
1367 | return _LttngLiveViewerGetDataStreamPacketDataReply( | |
1368 | status, bytes(), True, False | |
1369 | ) | |
1370 | ||
1371 | if self._max_query_data_response_size: | |
1372 | # Enforce a server side limit on the query requested length. | |
1373 | # To ensure that the transaction terminate take the minimum of both | |
1374 | # value. | |
1375 | data_response_length = min( | |
1376 | cmd.req_length, self._max_query_data_response_size | |
1377 | ) | |
1378 | fmt = 'Limiting "get data stream packet data" command: req-length={} actual response size={}' | |
1379 | logging.info(fmt.format(cmd.req_length, data_response_length)) | |
1380 | ||
1381 | data = stream_state.data_stream.get_data(cmd.offset, data_response_length) | |
1382 | status = _LttngLiveViewerGetDataStreamPacketDataReply.Status.OK | |
1383 | return _LttngLiveViewerGetDataStreamPacketDataReply(status, data, False, False) | |
1384 | ||
1385 | def _handle_get_metadata_stream_data_command(self, cmd): | |
1386 | fmt = 'Handling "get metadata stream data" command: stream-id={}' | |
1387 | logging.info(fmt.format(cmd.stream_id)) | |
78169723 | 1388 | metadata_stream_state = self._get_stream_state(cmd.stream_id) |
584af91e | 1389 | |
78169723 FD |
1390 | if ( |
1391 | type(metadata_stream_state) | |
1392 | is not _LttngLiveViewerSessionMetadataStreamState | |
1393 | ): | |
584af91e | 1394 | raise UnexpectedInput( |
f5567ea8 | 1395 | "Stream with ID {} is not a metadata stream".format(cmd.stream_id) |
584af91e PP |
1396 | ) |
1397 | ||
78169723 | 1398 | if metadata_stream_state.is_sent: |
584af91e PP |
1399 | status = _LttngLiveViewerGetMetadataStreamDataContentReply.Status.NO_NEW |
1400 | return _LttngLiveViewerGetMetadataStreamDataContentReply(status, bytes()) | |
1401 | ||
78169723 | 1402 | metadata_stream_state.is_sent = True |
584af91e | 1403 | status = _LttngLiveViewerGetMetadataStreamDataContentReply.Status.OK |
78169723 FD |
1404 | metadata_section = metadata_stream_state.cur_section |
1405 | ||
1406 | # If we are sending an empty section, ready the next one right away. | |
1407 | if len(metadata_section.data) == 0: | |
1408 | metadata_stream_state.is_sent = False | |
1409 | metadata_stream_state.goto_next_section() | |
1410 | ||
1411 | fmt = 'Replying to "get metadata stream data" command: metadata-size={}' | |
1412 | logging.info(fmt.format(len(metadata_section.data))) | |
584af91e | 1413 | return _LttngLiveViewerGetMetadataStreamDataContentReply( |
78169723 | 1414 | status, metadata_section.data |
584af91e PP |
1415 | ) |
1416 | ||
1417 | def _handle_get_new_stream_infos_command(self, cmd): | |
1418 | fmt = 'Handling "get new stream infos" command: ts-id={}' | |
1419 | logging.info(fmt.format(cmd.tracing_session_id)) | |
1420 | ||
1421 | # As of this version, all the tracing session's stream infos are | |
1422 | # always given to the viewer when sending the "attach to tracing | |
1423 | # session" reply, so there's nothing new here. Return the `HUP` | |
1424 | # status as, if we're handling this command, the viewer consumed | |
1425 | # all the existing data streams. | |
1426 | status = _LttngLiveViewerGetNewStreamInfosReply.Status.HUP | |
1427 | return _LttngLiveViewerGetNewStreamInfosReply(status, []) | |
1428 | ||
1429 | def _handle_get_tracing_session_infos_command(self, cmd): | |
1430 | logging.info('Handling "get tracing session infos" command.') | |
1431 | infos = [ | |
1432 | tss.tracing_session_descriptor.info for tss in self._ts_states.values() | |
1433 | ] | |
1434 | infos.sort(key=lambda info: info.name) | |
1435 | return _LttngLiveViewerGetTracingSessionInfosReply(infos) | |
1436 | ||
1437 | def _handle_create_viewer_session_command(self, cmd): | |
1438 | logging.info('Handling "create viewer session" command.') | |
1439 | status = _LttngLiveViewerCreateViewerSessionReply.Status.OK | |
1440 | ||
1441 | # This does nothing here. In the LTTng relay daemon, it | |
1442 | # allocates the viewer session's state. | |
1443 | return _LttngLiveViewerCreateViewerSessionReply(status) | |
1444 | ||
1445 | ||
1446 | # An LTTng live TCP server. | |
1447 | # | |
e51141d3 SM |
1448 | # On creation, it binds to `localhost` on the TCP port `port` if not `None`, or |
1449 | # on an OS-assigned TCP port otherwise. It writes the decimal TCP port number | |
1450 | # to a temporary port file. It renames the temporary port file to | |
1451 | # `port_filename`. | |
584af91e PP |
1452 | # |
1453 | # `tracing_session_descriptors` is a list of tracing session descriptors | |
1454 | # (`LttngTracingSessionDescriptor`) to serve. | |
1455 | # | |
1456 | # This server accepts a single viewer (client). | |
1457 | # | |
1458 | # When the viewer closes the connection, the server's constructor | |
1459 | # returns. | |
1460 | class LttngLiveServer: | |
1461 | def __init__( | |
e51141d3 SM |
1462 | self, |
1463 | port, | |
1464 | port_filename, | |
1465 | tracing_session_descriptors, | |
1466 | max_query_data_response_size, | |
584af91e | 1467 | ): |
f5567ea8 | 1468 | logging.info("Server configuration:") |
584af91e | 1469 | |
f5567ea8 | 1470 | logging.info(" Port file name: `{}`".format(port_filename)) |
584af91e PP |
1471 | |
1472 | if max_query_data_response_size is not None: | |
1473 | logging.info( | |
f5567ea8 | 1474 | " Maximum response data query size: `{}`".format( |
584af91e PP |
1475 | max_query_data_response_size |
1476 | ) | |
1477 | ) | |
1478 | ||
1479 | for ts_descr in tracing_session_descriptors: | |
1480 | info = ts_descr.info | |
1481 | fmt = ' TS descriptor: name="{}", id={}, hostname="{}", live-timer-freq={}, client-count={}, stream-count={}:' | |
1482 | logging.info( | |
1483 | fmt.format( | |
1484 | info.name, | |
1485 | info.tracing_session_id, | |
1486 | info.hostname, | |
1487 | info.live_timer_freq, | |
1488 | info.client_count, | |
1489 | info.stream_count, | |
1490 | ) | |
1491 | ) | |
1492 | ||
1493 | for trace in ts_descr.traces: | |
1494 | logging.info(' Trace: path="{}"'.format(trace.path)) | |
1495 | ||
1496 | self._ts_descriptors = tracing_session_descriptors | |
1497 | self._max_query_data_response_size = max_query_data_response_size | |
1498 | self._sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | |
1499 | self._codec = _LttngLiveViewerProtocolCodec() | |
1500 | ||
1501 | # Port 0: OS assigns an unused port | |
e51141d3 | 1502 | serv_addr = ("localhost", port if port is not None else 0) |
584af91e PP |
1503 | self._sock.bind(serv_addr) |
1504 | self._write_port_to_file(port_filename) | |
1505 | ||
1506 | try: | |
1507 | self._listen() | |
1508 | finally: | |
1509 | self._sock.close() | |
f5567ea8 | 1510 | logging.info("Closed connection and socket.") |
584af91e PP |
1511 | |
1512 | @property | |
1513 | def _server_port(self): | |
1514 | return self._sock.getsockname()[1] | |
1515 | ||
1516 | def _recv_command(self): | |
1517 | data = bytes() | |
1518 | ||
1519 | while True: | |
f5567ea8 | 1520 | logging.info("Waiting for viewer command.") |
584af91e PP |
1521 | buf = self._conn.recv(128) |
1522 | ||
1523 | if not buf: | |
f5567ea8 | 1524 | logging.info("Client closed connection.") |
584af91e PP |
1525 | |
1526 | if data: | |
1527 | raise UnexpectedInput( | |
f5567ea8 | 1528 | "Client closed connection after having sent {} command bytes.".format( |
584af91e PP |
1529 | len(data) |
1530 | ) | |
1531 | ) | |
1532 | ||
1533 | return | |
1534 | ||
f5567ea8 | 1535 | logging.info("Received data from viewer: length={}".format(len(buf))) |
584af91e PP |
1536 | |
1537 | data += buf | |
1538 | ||
1539 | try: | |
1540 | cmd = self._codec.decode(data) | |
1541 | except struct.error as exc: | |
f5567ea8 | 1542 | raise UnexpectedInput("Malformed command: {}".format(exc)) from exc |
584af91e PP |
1543 | |
1544 | if cmd is not None: | |
1545 | logging.info( | |
f5567ea8 | 1546 | "Received command from viewer: cmd-cls-name={}".format( |
584af91e PP |
1547 | cmd.__class__.__name__ |
1548 | ) | |
1549 | ) | |
1550 | return cmd | |
1551 | ||
1552 | def _send_reply(self, reply): | |
1553 | data = self._codec.encode(reply) | |
1554 | logging.info( | |
f5567ea8 | 1555 | "Sending reply to viewer: reply-cls-name={}, length={}".format( |
584af91e PP |
1556 | reply.__class__.__name__, len(data) |
1557 | ) | |
1558 | ) | |
1559 | self._conn.sendall(data) | |
1560 | ||
1561 | def _handle_connection(self): | |
1562 | # First command must be "connect" | |
1563 | cmd = self._recv_command() | |
1564 | ||
1565 | if type(cmd) is not _LttngLiveViewerConnectCommand: | |
1566 | raise UnexpectedInput( | |
1567 | 'First command is not "connect": cmd-cls-name={}'.format( | |
1568 | cmd.__class__.__name__ | |
1569 | ) | |
1570 | ) | |
1571 | ||
1572 | # Create viewer session (arbitrary ID 23) | |
1573 | logging.info( | |
f5567ea8 | 1574 | "LTTng live viewer connected: version={}.{}".format(cmd.major, cmd.minor) |
584af91e PP |
1575 | ) |
1576 | viewer_session = _LttngLiveViewerSession( | |
1577 | 23, self._ts_descriptors, self._max_query_data_response_size | |
1578 | ) | |
1579 | ||
1580 | # Send "connect" reply | |
1581 | self._send_reply( | |
1582 | _LttngLiveViewerConnectReply(viewer_session.viewer_session_id, 2, 10) | |
1583 | ) | |
1584 | ||
1585 | # Make the viewer session handle the remaining commands | |
1586 | while True: | |
1587 | cmd = self._recv_command() | |
1588 | ||
1589 | if cmd is None: | |
1590 | # Connection closed (at an expected location within the | |
1591 | # conversation) | |
1592 | return | |
1593 | ||
1594 | self._send_reply(viewer_session.handle_command(cmd)) | |
1595 | ||
1596 | def _listen(self): | |
f5567ea8 | 1597 | logging.info("Listening: port={}".format(self._server_port)) |
1726ac08 JR |
1598 | # Backlog must be present for Python version < 3.5. |
1599 | # 128 is an arbitrary number since we expect only 1 connection anyway. | |
1600 | self._sock.listen(128) | |
584af91e PP |
1601 | self._conn, viewer_addr = self._sock.accept() |
1602 | logging.info( | |
f5567ea8 | 1603 | "Accepted viewer: addr={}:{}".format(viewer_addr[0], viewer_addr[1]) |
584af91e PP |
1604 | ) |
1605 | ||
1606 | try: | |
1607 | self._handle_connection() | |
1608 | finally: | |
1609 | self._conn.close() | |
1610 | ||
1611 | def _write_port_to_file(self, port_filename): | |
1612 | # Write the port number to a temporary file. | |
f5567ea8 FD |
1613 | with tempfile.NamedTemporaryFile(mode="w", delete=False) as tmp_port_file: |
1614 | print(self._server_port, end="", file=tmp_port_file) | |
584af91e PP |
1615 | |
1616 | # Rename temporary file to real file | |
9c878ece | 1617 | os.replace(tmp_port_file.name, port_filename) |
584af91e PP |
1618 | logging.info( |
1619 | 'Renamed port file: src-path="{}", dst-path="{}"'.format( | |
1620 | tmp_port_file.name, port_filename | |
1621 | ) | |
1622 | ) | |
1623 | ||
1624 | ||
1625 | # A tracing session descriptor. | |
1626 | # | |
1627 | # In the constructor, `traces` is a list of LTTng traces (`LttngTrace` | |
1628 | # objects). | |
1629 | class LttngTracingSessionDescriptor: | |
1630 | def __init__( | |
1631 | self, name, tracing_session_id, hostname, live_timer_freq, client_count, traces | |
1632 | ): | |
1633 | for trace in traces: | |
1634 | if name not in trace.path: | |
f5567ea8 | 1635 | fmt = "Tracing session name must be part of every trace path (`{}` not found in `{}`)" |
584af91e PP |
1636 | raise ValueError(fmt.format(name, trace.path)) |
1637 | ||
1638 | self._traces = traces | |
1639 | stream_count = sum([len(t) + 1 for t in traces]) | |
1640 | self._info = _LttngLiveViewerTracingSessionInfo( | |
1641 | tracing_session_id, | |
1642 | live_timer_freq, | |
1643 | client_count, | |
1644 | stream_count, | |
1645 | hostname, | |
1646 | name, | |
1647 | ) | |
1648 | ||
1649 | @property | |
1650 | def traces(self): | |
1651 | return self._traces | |
1652 | ||
1653 | @property | |
1654 | def info(self): | |
1655 | return self._info | |
1656 | ||
1657 | ||
2b763e29 JG |
1658 | def _session_descriptors_from_path(sessions_filename, trace_path_prefix): |
1659 | # File format is: | |
1660 | # | |
1661 | # [ | |
1662 | # { | |
1663 | # "name": "my-session", | |
1664 | # "id": 17, | |
1665 | # "hostname": "myhost", | |
1666 | # "live-timer-freq": 1000000, | |
1667 | # "client-count": 23, | |
1668 | # "traces": [ | |
1669 | # { | |
1670 | # "path": "lol" | |
1671 | # }, | |
1672 | # { | |
71f56e5f JG |
1673 | # "path": "meow/mix", |
1674 | # "beacons": { | |
1675 | # "my_stream": [ 5235787, 728375283 ] | |
78169723 FD |
1676 | # }, |
1677 | # "metadata-sections": [ | |
1678 | # { | |
1679 | # "line": 1, | |
1680 | # "timestamp": 0 | |
1681 | # } | |
1682 | # ] | |
2b763e29 JG |
1683 | # } |
1684 | # ] | |
1685 | # } | |
1686 | # ] | |
f5567ea8 | 1687 | with open(sessions_filename, "r") as sessions_file: |
2b763e29 JG |
1688 | params = json.load(sessions_file) |
1689 | ||
1690 | sessions = [] | |
1691 | ||
1692 | for session in params: | |
f5567ea8 FD |
1693 | name = session["name"] |
1694 | tracing_session_id = session["id"] | |
1695 | hostname = session["hostname"] | |
1696 | live_timer_freq = session["live-timer-freq"] | |
1697 | client_count = session["client-count"] | |
2b763e29 JG |
1698 | traces = [] |
1699 | ||
f5567ea8 FD |
1700 | for trace in session["traces"]: |
1701 | metadata_sections = trace.get("metadata-sections") | |
1702 | beacons = trace.get("beacons") | |
1703 | path = trace["path"] | |
2b763e29 JG |
1704 | |
1705 | if not os.path.isabs(path): | |
1706 | path = os.path.join(trace_path_prefix, path) | |
1707 | ||
78169723 | 1708 | traces.append(LttngTrace(path, metadata_sections, beacons)) |
2b763e29 JG |
1709 | |
1710 | sessions.append( | |
1711 | LttngTracingSessionDescriptor( | |
1712 | name, | |
1713 | tracing_session_id, | |
1714 | hostname, | |
1715 | live_timer_freq, | |
1716 | client_count, | |
1717 | traces, | |
1718 | ) | |
1719 | ) | |
1720 | ||
1721 | return sessions | |
584af91e PP |
1722 | |
1723 | ||
1724 | def _loglevel_parser(string): | |
f5567ea8 | 1725 | loglevels = {"info": logging.INFO, "warning": logging.WARNING} |
584af91e PP |
1726 | if string not in loglevels: |
1727 | msg = "{} is not a valid loglevel".format(string) | |
1728 | raise argparse.ArgumentTypeError(msg) | |
1729 | return loglevels[string] | |
1730 | ||
1731 | ||
f5567ea8 FD |
1732 | if __name__ == "__main__": |
1733 | logging.basicConfig(format="# %(asctime)-25s%(message)s") | |
584af91e | 1734 | parser = argparse.ArgumentParser( |
f5567ea8 | 1735 | description="LTTng-live protocol mocker", add_help=False |
584af91e PP |
1736 | ) |
1737 | parser.add_argument( | |
f5567ea8 FD |
1738 | "--log-level", |
1739 | default="warning", | |
1740 | choices=["info", "warning"], | |
1741 | help="The loglevel to be used.", | |
584af91e PP |
1742 | ) |
1743 | ||
1744 | loglevel_namespace, remaining_args = parser.parse_known_args() | |
1745 | logging.getLogger().setLevel(_loglevel_parser(loglevel_namespace.log_level)) | |
1746 | ||
e51141d3 SM |
1747 | parser.add_argument( |
1748 | "--port", | |
1749 | help="The port to bind to. If missing, use an OS-assigned port..", | |
1750 | type=int, | |
1751 | ) | |
584af91e | 1752 | parser.add_argument( |
f5567ea8 FD |
1753 | "--port-filename", |
1754 | help="The final port file. This file is present when the server is ready to receive connection.", | |
584af91e PP |
1755 | required=True, |
1756 | ) | |
1757 | parser.add_argument( | |
f5567ea8 | 1758 | "--max-query-data-response-size", |
584af91e | 1759 | type=int, |
f5567ea8 | 1760 | help="The maximum size of control data response in bytes", |
584af91e PP |
1761 | ) |
1762 | parser.add_argument( | |
f5567ea8 | 1763 | "--trace-path-prefix", |
2b763e29 | 1764 | type=str, |
f5567ea8 | 1765 | help="Prefix to prepend to the trace paths of session configurations", |
2b763e29 JG |
1766 | ) |
1767 | parser.add_argument( | |
f5567ea8 | 1768 | "--sessions-filename", |
776a2a25 | 1769 | type=str, |
f5567ea8 | 1770 | help="Path to a session configuration file", |
584af91e PP |
1771 | ) |
1772 | parser.add_argument( | |
f5567ea8 FD |
1773 | "-h", |
1774 | "--help", | |
1775 | action="help", | |
584af91e | 1776 | default=argparse.SUPPRESS, |
f5567ea8 | 1777 | help="Show this help message and exit.", |
584af91e PP |
1778 | ) |
1779 | ||
1780 | args = parser.parse_args(args=remaining_args) | |
1781 | try: | |
2b763e29 | 1782 | sessions = _session_descriptors_from_path( |
78169723 FD |
1783 | args.sessions_filename, |
1784 | args.trace_path_prefix, | |
584af91e | 1785 | ) |
e51141d3 SM |
1786 | LttngLiveServer( |
1787 | args.port, args.port_filename, sessions, args.max_query_data_response_size | |
1788 | ) | |
584af91e PP |
1789 | except UnexpectedInput as exc: |
1790 | logging.error(str(exc)) | |
1791 | print(exc, file=sys.stderr) | |
1792 | sys.exit(1) |