| 1 | # SPDX-License-Identifier: MIT |
| 2 | # |
| 3 | # Copyright (C) 2019 Philippe Proulx <pproulx@efficios.com> |
| 4 | # |
| 5 | |
| 6 | import os |
| 7 | import re |
| 8 | import sys |
| 9 | import json |
| 10 | import socket |
| 11 | import struct |
| 12 | import logging |
| 13 | import os.path |
| 14 | import argparse |
| 15 | import tempfile |
| 16 | import collections.abc |
| 17 | from collections import namedtuple |
| 18 | |
| 19 | |
| 20 | class UnexpectedInput(RuntimeError): |
| 21 | pass |
| 22 | |
| 23 | |
| 24 | # An entry within the index of an LTTng data stream. |
| 25 | class _LttngDataStreamIndexEntry: |
| 26 | def __init__( |
| 27 | self, |
| 28 | offset_bytes, |
| 29 | total_size_bits, |
| 30 | content_size_bits, |
| 31 | timestamp_begin, |
| 32 | timestamp_end, |
| 33 | events_discarded, |
| 34 | stream_class_id, |
| 35 | ): |
| 36 | self._offset_bytes = offset_bytes |
| 37 | self._total_size_bits = total_size_bits |
| 38 | self._content_size_bits = content_size_bits |
| 39 | self._timestamp_begin = timestamp_begin |
| 40 | self._timestamp_end = timestamp_end |
| 41 | self._events_discarded = events_discarded |
| 42 | self._stream_class_id = stream_class_id |
| 43 | |
| 44 | @property |
| 45 | def offset_bytes(self): |
| 46 | return self._offset_bytes |
| 47 | |
| 48 | @property |
| 49 | def total_size_bits(self): |
| 50 | return self._total_size_bits |
| 51 | |
| 52 | @property |
| 53 | def total_size_bytes(self): |
| 54 | return self._total_size_bits // 8 |
| 55 | |
| 56 | @property |
| 57 | def content_size_bits(self): |
| 58 | return self._content_size_bits |
| 59 | |
| 60 | @property |
| 61 | def content_size_bytes(self): |
| 62 | return self._content_size_bits // 8 |
| 63 | |
| 64 | @property |
| 65 | def timestamp_begin(self): |
| 66 | return self._timestamp_begin |
| 67 | |
| 68 | @property |
| 69 | def timestamp_end(self): |
| 70 | return self._timestamp_end |
| 71 | |
| 72 | @property |
| 73 | def events_discarded(self): |
| 74 | return self._events_discarded |
| 75 | |
| 76 | @property |
| 77 | def stream_class_id(self): |
| 78 | return self._stream_class_id |
| 79 | |
| 80 | |
| 81 | # An entry within the index of an LTTng data stream. While a stream beacon entry |
| 82 | # is conceptually unrelated to an index, it is sent as a reply to a |
| 83 | # LttngLiveViewerGetNextDataStreamIndexEntryCommand |
| 84 | class _LttngDataStreamBeaconEntry: |
| 85 | def __init__(self, stream_class_id, timestamp): |
| 86 | self._stream_class_id = stream_class_id |
| 87 | self._timestamp = timestamp |
| 88 | |
| 89 | @property |
| 90 | def timestamp(self): |
| 91 | return self._timestamp |
| 92 | |
| 93 | @property |
| 94 | def stream_class_id(self): |
| 95 | return self._stream_class_id |
| 96 | |
| 97 | |
| 98 | class _LttngLiveViewerCommand: |
| 99 | def __init__(self, version): |
| 100 | self._version = version |
| 101 | |
| 102 | @property |
| 103 | def version(self): |
| 104 | return self._version |
| 105 | |
| 106 | |
| 107 | class _LttngLiveViewerConnectCommand(_LttngLiveViewerCommand): |
| 108 | def __init__(self, version, viewer_session_id, major, minor): |
| 109 | super().__init__(version) |
| 110 | self._viewer_session_id = viewer_session_id |
| 111 | self._major = major |
| 112 | self._minor = minor |
| 113 | |
| 114 | @property |
| 115 | def viewer_session_id(self): |
| 116 | return self._viewer_session_id |
| 117 | |
| 118 | @property |
| 119 | def major(self): |
| 120 | return self._major |
| 121 | |
| 122 | @property |
| 123 | def minor(self): |
| 124 | return self._minor |
| 125 | |
| 126 | |
| 127 | class _LttngLiveViewerConnectReply: |
| 128 | def __init__(self, viewer_session_id, major, minor): |
| 129 | self._viewer_session_id = viewer_session_id |
| 130 | self._major = major |
| 131 | self._minor = minor |
| 132 | |
| 133 | @property |
| 134 | def viewer_session_id(self): |
| 135 | return self._viewer_session_id |
| 136 | |
| 137 | @property |
| 138 | def major(self): |
| 139 | return self._major |
| 140 | |
| 141 | @property |
| 142 | def minor(self): |
| 143 | return self._minor |
| 144 | |
| 145 | |
| 146 | class _LttngLiveViewerGetTracingSessionInfosCommand(_LttngLiveViewerCommand): |
| 147 | pass |
| 148 | |
| 149 | |
| 150 | class _LttngLiveViewerTracingSessionInfo: |
| 151 | def __init__( |
| 152 | self, |
| 153 | tracing_session_id, |
| 154 | live_timer_freq, |
| 155 | client_count, |
| 156 | stream_count, |
| 157 | hostname, |
| 158 | name, |
| 159 | ): |
| 160 | self._tracing_session_id = tracing_session_id |
| 161 | self._live_timer_freq = live_timer_freq |
| 162 | self._client_count = client_count |
| 163 | self._stream_count = stream_count |
| 164 | self._hostname = hostname |
| 165 | self._name = name |
| 166 | |
| 167 | @property |
| 168 | def tracing_session_id(self): |
| 169 | return self._tracing_session_id |
| 170 | |
| 171 | @property |
| 172 | def live_timer_freq(self): |
| 173 | return self._live_timer_freq |
| 174 | |
| 175 | @property |
| 176 | def client_count(self): |
| 177 | return self._client_count |
| 178 | |
| 179 | @property |
| 180 | def stream_count(self): |
| 181 | return self._stream_count |
| 182 | |
| 183 | @property |
| 184 | def hostname(self): |
| 185 | return self._hostname |
| 186 | |
| 187 | @property |
| 188 | def name(self): |
| 189 | return self._name |
| 190 | |
| 191 | |
| 192 | class _LttngLiveViewerGetTracingSessionInfosReply: |
| 193 | def __init__(self, tracing_session_infos): |
| 194 | self._tracing_session_infos = tracing_session_infos |
| 195 | |
| 196 | @property |
| 197 | def tracing_session_infos(self): |
| 198 | return self._tracing_session_infos |
| 199 | |
| 200 | |
| 201 | class _LttngLiveViewerAttachToTracingSessionCommand(_LttngLiveViewerCommand): |
| 202 | class SeekType: |
| 203 | BEGINNING = 1 |
| 204 | LAST = 2 |
| 205 | |
| 206 | def __init__(self, version, tracing_session_id, offset, seek_type): |
| 207 | super().__init__(version) |
| 208 | self._tracing_session_id = tracing_session_id |
| 209 | self._offset = offset |
| 210 | self._seek_type = seek_type |
| 211 | |
| 212 | @property |
| 213 | def tracing_session_id(self): |
| 214 | return self._tracing_session_id |
| 215 | |
| 216 | @property |
| 217 | def offset(self): |
| 218 | return self._offset |
| 219 | |
| 220 | @property |
| 221 | def seek_type(self): |
| 222 | return self._seek_type |
| 223 | |
| 224 | |
| 225 | class _LttngLiveViewerStreamInfo: |
| 226 | def __init__(self, id, trace_id, is_metadata, path, channel_name): |
| 227 | self._id = id |
| 228 | self._trace_id = trace_id |
| 229 | self._is_metadata = is_metadata |
| 230 | self._path = path |
| 231 | self._channel_name = channel_name |
| 232 | |
| 233 | @property |
| 234 | def id(self): |
| 235 | return self._id |
| 236 | |
| 237 | @property |
| 238 | def trace_id(self): |
| 239 | return self._trace_id |
| 240 | |
| 241 | @property |
| 242 | def is_metadata(self): |
| 243 | return self._is_metadata |
| 244 | |
| 245 | @property |
| 246 | def path(self): |
| 247 | return self._path |
| 248 | |
| 249 | @property |
| 250 | def channel_name(self): |
| 251 | return self._channel_name |
| 252 | |
| 253 | |
| 254 | class _LttngLiveViewerAttachToTracingSessionReply: |
| 255 | class Status: |
| 256 | OK = 1 |
| 257 | ALREADY = 2 |
| 258 | UNKNOWN = 3 |
| 259 | NOT_LIVE = 4 |
| 260 | SEEK_ERROR = 5 |
| 261 | NO_SESSION = 6 |
| 262 | |
| 263 | def __init__(self, status, stream_infos): |
| 264 | self._status = status |
| 265 | self._stream_infos = stream_infos |
| 266 | |
| 267 | @property |
| 268 | def status(self): |
| 269 | return self._status |
| 270 | |
| 271 | @property |
| 272 | def stream_infos(self): |
| 273 | return self._stream_infos |
| 274 | |
| 275 | |
| 276 | class _LttngLiveViewerGetNextDataStreamIndexEntryCommand(_LttngLiveViewerCommand): |
| 277 | def __init__(self, version, stream_id): |
| 278 | super().__init__(version) |
| 279 | self._stream_id = stream_id |
| 280 | |
| 281 | @property |
| 282 | def stream_id(self): |
| 283 | return self._stream_id |
| 284 | |
| 285 | |
| 286 | class _LttngLiveViewerGetNextDataStreamIndexEntryReply: |
| 287 | class Status: |
| 288 | OK = 1 |
| 289 | RETRY = 2 |
| 290 | HUP = 3 |
| 291 | ERROR = 4 |
| 292 | INACTIVE = 5 |
| 293 | EOF = 6 |
| 294 | |
| 295 | def __init__(self, status, index_entry, has_new_metadata, has_new_data_stream): |
| 296 | self._status = status |
| 297 | self._index_entry = index_entry |
| 298 | self._has_new_metadata = has_new_metadata |
| 299 | self._has_new_data_stream = has_new_data_stream |
| 300 | |
| 301 | @property |
| 302 | def status(self): |
| 303 | return self._status |
| 304 | |
| 305 | @property |
| 306 | def index_entry(self): |
| 307 | return self._index_entry |
| 308 | |
| 309 | @property |
| 310 | def has_new_metadata(self): |
| 311 | return self._has_new_metadata |
| 312 | |
| 313 | @property |
| 314 | def has_new_data_stream(self): |
| 315 | return self._has_new_data_stream |
| 316 | |
| 317 | |
| 318 | class _LttngLiveViewerGetDataStreamPacketDataCommand(_LttngLiveViewerCommand): |
| 319 | def __init__(self, version, stream_id, offset, req_length): |
| 320 | super().__init__(version) |
| 321 | self._stream_id = stream_id |
| 322 | self._offset = offset |
| 323 | self._req_length = req_length |
| 324 | |
| 325 | @property |
| 326 | def stream_id(self): |
| 327 | return self._stream_id |
| 328 | |
| 329 | @property |
| 330 | def offset(self): |
| 331 | return self._offset |
| 332 | |
| 333 | @property |
| 334 | def req_length(self): |
| 335 | return self._req_length |
| 336 | |
| 337 | |
| 338 | class _LttngLiveViewerGetDataStreamPacketDataReply: |
| 339 | class Status: |
| 340 | OK = 1 |
| 341 | RETRY = 2 |
| 342 | ERROR = 3 |
| 343 | EOF = 4 |
| 344 | |
| 345 | def __init__(self, status, data, has_new_metadata, has_new_data_stream): |
| 346 | self._status = status |
| 347 | self._data = data |
| 348 | self._has_new_metadata = has_new_metadata |
| 349 | self._has_new_data_stream = has_new_data_stream |
| 350 | |
| 351 | @property |
| 352 | def status(self): |
| 353 | return self._status |
| 354 | |
| 355 | @property |
| 356 | def data(self): |
| 357 | return self._data |
| 358 | |
| 359 | @property |
| 360 | def has_new_metadata(self): |
| 361 | return self._has_new_metadata |
| 362 | |
| 363 | @property |
| 364 | def has_new_data_stream(self): |
| 365 | return self._has_new_data_stream |
| 366 | |
| 367 | |
| 368 | class _LttngLiveViewerGetMetadataStreamDataCommand(_LttngLiveViewerCommand): |
| 369 | def __init__(self, version, stream_id): |
| 370 | super().__init__(version) |
| 371 | self._stream_id = stream_id |
| 372 | |
| 373 | @property |
| 374 | def stream_id(self): |
| 375 | return self._stream_id |
| 376 | |
| 377 | |
| 378 | class _LttngLiveViewerGetMetadataStreamDataContentReply: |
| 379 | class Status: |
| 380 | OK = 1 |
| 381 | NO_NEW = 2 |
| 382 | ERROR = 3 |
| 383 | |
| 384 | def __init__(self, status, data): |
| 385 | self._status = status |
| 386 | self._data = data |
| 387 | |
| 388 | @property |
| 389 | def status(self): |
| 390 | return self._status |
| 391 | |
| 392 | @property |
| 393 | def data(self): |
| 394 | return self._data |
| 395 | |
| 396 | |
| 397 | class _LttngLiveViewerGetNewStreamInfosCommand(_LttngLiveViewerCommand): |
| 398 | def __init__(self, version, tracing_session_id): |
| 399 | super().__init__(version) |
| 400 | self._tracing_session_id = tracing_session_id |
| 401 | |
| 402 | @property |
| 403 | def tracing_session_id(self): |
| 404 | return self._tracing_session_id |
| 405 | |
| 406 | |
| 407 | class _LttngLiveViewerGetNewStreamInfosReply: |
| 408 | class Status: |
| 409 | OK = 1 |
| 410 | NO_NEW = 2 |
| 411 | ERROR = 3 |
| 412 | HUP = 4 |
| 413 | |
| 414 | def __init__(self, status, stream_infos): |
| 415 | self._status = status |
| 416 | self._stream_infos = stream_infos |
| 417 | |
| 418 | @property |
| 419 | def status(self): |
| 420 | return self._status |
| 421 | |
| 422 | @property |
| 423 | def stream_infos(self): |
| 424 | return self._stream_infos |
| 425 | |
| 426 | |
| 427 | class _LttngLiveViewerCreateViewerSessionCommand(_LttngLiveViewerCommand): |
| 428 | pass |
| 429 | |
| 430 | |
| 431 | class _LttngLiveViewerCreateViewerSessionReply: |
| 432 | class Status: |
| 433 | OK = 1 |
| 434 | ERROR = 2 |
| 435 | |
| 436 | def __init__(self, status): |
| 437 | self._status = status |
| 438 | |
| 439 | @property |
| 440 | def status(self): |
| 441 | return self._status |
| 442 | |
| 443 | |
| 444 | class _LttngLiveViewerDetachFromTracingSessionCommand(_LttngLiveViewerCommand): |
| 445 | def __init__(self, version, tracing_session_id): |
| 446 | super().__init__(version) |
| 447 | self._tracing_session_id = tracing_session_id |
| 448 | |
| 449 | @property |
| 450 | def tracing_session_id(self): |
| 451 | return self._tracing_session_id |
| 452 | |
| 453 | |
| 454 | class _LttngLiveViewerDetachFromTracingSessionReply: |
| 455 | class Status: |
| 456 | OK = 1 |
| 457 | UNKNOWN = 2 |
| 458 | ERROR = 3 |
| 459 | |
| 460 | def __init__(self, status): |
| 461 | self._status = status |
| 462 | |
| 463 | @property |
| 464 | def status(self): |
| 465 | return self._status |
| 466 | |
| 467 | |
| 468 | # An LTTng live protocol codec can convert bytes to command objects and |
| 469 | # reply objects to bytes. |
| 470 | class _LttngLiveViewerProtocolCodec: |
| 471 | _COMMAND_HEADER_STRUCT_FMT = "QII" |
| 472 | _COMMAND_HEADER_SIZE_BYTES = struct.calcsize(_COMMAND_HEADER_STRUCT_FMT) |
| 473 | |
| 474 | def __init__(self): |
| 475 | pass |
| 476 | |
| 477 | def _unpack(self, fmt, data, offset=0): |
| 478 | fmt = "!" + fmt |
| 479 | return struct.unpack_from(fmt, data, offset) |
| 480 | |
| 481 | def _unpack_payload(self, fmt, data): |
| 482 | return self._unpack( |
| 483 | fmt, data, _LttngLiveViewerProtocolCodec._COMMAND_HEADER_SIZE_BYTES |
| 484 | ) |
| 485 | |
| 486 | def decode(self, data): |
| 487 | if len(data) < self._COMMAND_HEADER_SIZE_BYTES: |
| 488 | # Not enough data to read the command header |
| 489 | return |
| 490 | |
| 491 | payload_size, cmd_type, version = self._unpack( |
| 492 | self._COMMAND_HEADER_STRUCT_FMT, data |
| 493 | ) |
| 494 | logging.info( |
| 495 | "Decoded command header: payload-size={}, cmd-type={}, version={}".format( |
| 496 | payload_size, cmd_type, version |
| 497 | ) |
| 498 | ) |
| 499 | |
| 500 | if len(data) < self._COMMAND_HEADER_SIZE_BYTES + payload_size: |
| 501 | # Not enough data to read the whole command |
| 502 | return |
| 503 | |
| 504 | if cmd_type == 1: |
| 505 | viewer_session_id, major, minor, conn_type = self._unpack_payload( |
| 506 | "QIII", data |
| 507 | ) |
| 508 | return _LttngLiveViewerConnectCommand( |
| 509 | version, viewer_session_id, major, minor |
| 510 | ) |
| 511 | elif cmd_type == 2: |
| 512 | return _LttngLiveViewerGetTracingSessionInfosCommand(version) |
| 513 | elif cmd_type == 3: |
| 514 | tracing_session_id, offset, seek_type = self._unpack_payload("QQI", data) |
| 515 | return _LttngLiveViewerAttachToTracingSessionCommand( |
| 516 | version, tracing_session_id, offset, seek_type |
| 517 | ) |
| 518 | elif cmd_type == 4: |
| 519 | (stream_id,) = self._unpack_payload("Q", data) |
| 520 | return _LttngLiveViewerGetNextDataStreamIndexEntryCommand( |
| 521 | version, stream_id |
| 522 | ) |
| 523 | elif cmd_type == 5: |
| 524 | stream_id, offset, req_length = self._unpack_payload("QQI", data) |
| 525 | return _LttngLiveViewerGetDataStreamPacketDataCommand( |
| 526 | version, stream_id, offset, req_length |
| 527 | ) |
| 528 | elif cmd_type == 6: |
| 529 | (stream_id,) = self._unpack_payload("Q", data) |
| 530 | return _LttngLiveViewerGetMetadataStreamDataCommand(version, stream_id) |
| 531 | elif cmd_type == 7: |
| 532 | (tracing_session_id,) = self._unpack_payload("Q", data) |
| 533 | return _LttngLiveViewerGetNewStreamInfosCommand(version, tracing_session_id) |
| 534 | elif cmd_type == 8: |
| 535 | return _LttngLiveViewerCreateViewerSessionCommand(version) |
| 536 | elif cmd_type == 9: |
| 537 | (tracing_session_id,) = self._unpack_payload("Q", data) |
| 538 | return _LttngLiveViewerDetachFromTracingSessionCommand( |
| 539 | version, tracing_session_id |
| 540 | ) |
| 541 | else: |
| 542 | raise UnexpectedInput("Unknown command type {}".format(cmd_type)) |
| 543 | |
| 544 | def _pack(self, fmt, *args): |
| 545 | # Force network byte order |
| 546 | return struct.pack("!" + fmt, *args) |
| 547 | |
| 548 | def _encode_zero_padded_str(self, string, length): |
| 549 | data = string.encode() |
| 550 | return data.ljust(length, b"\x00") |
| 551 | |
| 552 | def _encode_stream_info(self, info): |
| 553 | data = self._pack("QQI", info.id, info.trace_id, int(info.is_metadata)) |
| 554 | data += self._encode_zero_padded_str(info.path, 4096) |
| 555 | data += self._encode_zero_padded_str(info.channel_name, 255) |
| 556 | return data |
| 557 | |
| 558 | def _get_has_new_stuff_flags(self, has_new_metadata, has_new_data_streams): |
| 559 | flags = 0 |
| 560 | |
| 561 | if has_new_metadata: |
| 562 | flags |= 1 |
| 563 | |
| 564 | if has_new_data_streams: |
| 565 | flags |= 2 |
| 566 | |
| 567 | return flags |
| 568 | |
| 569 | def encode(self, reply): |
| 570 | if type(reply) is _LttngLiveViewerConnectReply: |
| 571 | data = self._pack( |
| 572 | "QIII", reply.viewer_session_id, reply.major, reply.minor, 2 |
| 573 | ) |
| 574 | elif type(reply) is _LttngLiveViewerGetTracingSessionInfosReply: |
| 575 | data = self._pack("I", len(reply.tracing_session_infos)) |
| 576 | |
| 577 | for info in reply.tracing_session_infos: |
| 578 | data += self._pack( |
| 579 | "QIII", |
| 580 | info.tracing_session_id, |
| 581 | info.live_timer_freq, |
| 582 | info.client_count, |
| 583 | info.stream_count, |
| 584 | ) |
| 585 | data += self._encode_zero_padded_str(info.hostname, 64) |
| 586 | data += self._encode_zero_padded_str(info.name, 255) |
| 587 | elif type(reply) is _LttngLiveViewerAttachToTracingSessionReply: |
| 588 | data = self._pack("II", reply.status, len(reply.stream_infos)) |
| 589 | |
| 590 | for info in reply.stream_infos: |
| 591 | data += self._encode_stream_info(info) |
| 592 | elif type(reply) is _LttngLiveViewerGetNextDataStreamIndexEntryReply: |
| 593 | index_format = "QQQQQQQII" |
| 594 | entry = reply.index_entry |
| 595 | flags = self._get_has_new_stuff_flags( |
| 596 | reply.has_new_metadata, reply.has_new_data_stream |
| 597 | ) |
| 598 | |
| 599 | if type(entry) is _LttngDataStreamIndexEntry: |
| 600 | data = self._pack( |
| 601 | index_format, |
| 602 | entry.offset_bytes, |
| 603 | entry.total_size_bits, |
| 604 | entry.content_size_bits, |
| 605 | entry.timestamp_begin, |
| 606 | entry.timestamp_end, |
| 607 | entry.events_discarded, |
| 608 | entry.stream_class_id, |
| 609 | reply.status, |
| 610 | flags, |
| 611 | ) |
| 612 | else: |
| 613 | assert type(entry) is _LttngDataStreamBeaconEntry |
| 614 | data = self._pack( |
| 615 | index_format, |
| 616 | 0, |
| 617 | 0, |
| 618 | 0, |
| 619 | 0, |
| 620 | entry.timestamp, |
| 621 | 0, |
| 622 | entry.stream_class_id, |
| 623 | reply.status, |
| 624 | flags, |
| 625 | ) |
| 626 | elif type(reply) is _LttngLiveViewerGetDataStreamPacketDataReply: |
| 627 | flags = self._get_has_new_stuff_flags( |
| 628 | reply.has_new_metadata, reply.has_new_data_stream |
| 629 | ) |
| 630 | data = self._pack("III", reply.status, len(reply.data), flags) |
| 631 | data += reply.data |
| 632 | elif type(reply) is _LttngLiveViewerGetMetadataStreamDataContentReply: |
| 633 | data = self._pack("QI", len(reply.data), reply.status) |
| 634 | data += reply.data |
| 635 | elif type(reply) is _LttngLiveViewerGetNewStreamInfosReply: |
| 636 | data = self._pack("II", reply.status, len(reply.stream_infos)) |
| 637 | |
| 638 | for info in reply.stream_infos: |
| 639 | data += self._encode_stream_info(info) |
| 640 | elif type(reply) is _LttngLiveViewerCreateViewerSessionReply: |
| 641 | data = self._pack("I", reply.status) |
| 642 | elif type(reply) is _LttngLiveViewerDetachFromTracingSessionReply: |
| 643 | data = self._pack("I", reply.status) |
| 644 | else: |
| 645 | raise ValueError( |
| 646 | "Unknown reply object with class `{}`".format(reply.__class__.__name__) |
| 647 | ) |
| 648 | |
| 649 | return data |
| 650 | |
| 651 | |
| 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 | |
| 660 | # The index of an LTTng data stream, a sequence of index entries. |
| 661 | class _LttngDataStreamIndex(collections.abc.Sequence): |
| 662 | def __init__(self, path, beacons): |
| 663 | self._path = path |
| 664 | self._build() |
| 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 | |
| 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 | |
| 683 | with open(self._path, "rb") as f: |
| 684 | # Read header first |
| 685 | fmt = ">IIII" |
| 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 |
| 695 | fmt = ">QQQQQQQ" |
| 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 |
| 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) |
| 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 | |
| 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 | |
| 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: |
| 760 | def __init__(self, path, beacons): |
| 761 | self._path = path |
| 762 | filename = os.path.basename(path) |
| 763 | match = re.match(r"(.*)_\d+", filename) |
| 764 | if not match: |
| 765 | raise RuntimeError( |
| 766 | "Unexpected data stream file name pattern: {}".format(filename) |
| 767 | ) |
| 768 | |
| 769 | self._channel_name = match.group(1) |
| 770 | trace_dir = os.path.dirname(path) |
| 771 | index_path = os.path.join(trace_dir, "index", filename + ".idx") |
| 772 | self._index = _LttngDataStreamIndex(index_path, beacons) |
| 773 | assert os.path.isfile(path) |
| 774 | self._file = open(path, "rb") |
| 775 | logging.info( |
| 776 | 'Built data stream: path="{}", channel-name="{}"'.format( |
| 777 | path, self._channel_name |
| 778 | ) |
| 779 | ) |
| 780 | |
| 781 | @property |
| 782 | def path(self): |
| 783 | return self._path |
| 784 | |
| 785 | @property |
| 786 | def channel_name(self): |
| 787 | return self._channel_name |
| 788 | |
| 789 | @property |
| 790 | def index(self): |
| 791 | return self._index |
| 792 | |
| 793 | def get_data(self, offset_bytes, len_bytes): |
| 794 | self._file.seek(offset_bytes) |
| 795 | return self._file.read(len_bytes) |
| 796 | |
| 797 | |
| 798 | class _LttngMetadataStreamSection: |
| 799 | def __init__(self, timestamp, data): |
| 800 | self._timestamp = timestamp |
| 801 | if data is None: |
| 802 | self._data = bytes() |
| 803 | else: |
| 804 | self._data = data |
| 805 | logging.info( |
| 806 | "Built metadata stream section: ts={}, data-len={}".format( |
| 807 | self._timestamp, len(self._data) |
| 808 | ) |
| 809 | ) |
| 810 | |
| 811 | @property |
| 812 | def timestamp(self): |
| 813 | return self._timestamp |
| 814 | |
| 815 | @property |
| 816 | def data(self): |
| 817 | return self._data |
| 818 | |
| 819 | |
| 820 | # An LTTng metadata stream. |
| 821 | class _LttngMetadataStream: |
| 822 | def __init__(self, metadata_file_path, config_sections): |
| 823 | self._path = metadata_file_path |
| 824 | self._sections = config_sections |
| 825 | logging.info( |
| 826 | "Built metadata stream: path={}, section-len={}".format( |
| 827 | self._path, len(self._sections) |
| 828 | ) |
| 829 | ) |
| 830 | |
| 831 | @property |
| 832 | def path(self): |
| 833 | return self._path |
| 834 | |
| 835 | @property |
| 836 | def sections(self): |
| 837 | return self._sections |
| 838 | |
| 839 | |
| 840 | LttngMetadataConfigSection = namedtuple( |
| 841 | "LttngMetadataConfigSection", ["line", "timestamp", "is_empty"] |
| 842 | ) |
| 843 | |
| 844 | |
| 845 | def _parse_metadata_sections_config(config_sections): |
| 846 | assert config_sections is not None |
| 847 | config_metadata_sections = [] |
| 848 | append_empty_section = False |
| 849 | last_timestamp = 0 |
| 850 | last_line = 0 |
| 851 | |
| 852 | for config_section in config_sections: |
| 853 | if config_section == "empty": |
| 854 | # Found a empty section marker. Actually append the section at the |
| 855 | # timestamp of the next concrete section. |
| 856 | append_empty_section = True |
| 857 | else: |
| 858 | assert type(config_section) is dict |
| 859 | line = config_section.get("line") |
| 860 | ts = config_section.get("timestamp") |
| 861 | |
| 862 | if type(line) is not int: |
| 863 | raise RuntimeError("`line` is not an integer") |
| 864 | |
| 865 | if type(ts) is not int: |
| 866 | raise RuntimeError("`timestamp` is not an integer") |
| 867 | |
| 868 | # Sections' timestamps and lines must both be increasing. |
| 869 | assert ts > last_timestamp |
| 870 | last_timestamp = ts |
| 871 | assert line > last_line |
| 872 | last_line = line |
| 873 | |
| 874 | if append_empty_section: |
| 875 | config_metadata_sections.append( |
| 876 | LttngMetadataConfigSection(line, ts, True) |
| 877 | ) |
| 878 | append_empty_section = False |
| 879 | |
| 880 | config_metadata_sections.append(LttngMetadataConfigSection(line, ts, False)) |
| 881 | |
| 882 | return config_metadata_sections |
| 883 | |
| 884 | |
| 885 | def _split_metadata_sections(metadata_file_path, raw_config_sections): |
| 886 | assert isinstance(raw_config_sections, collections.abc.Sequence) |
| 887 | |
| 888 | parsed_sections = _parse_metadata_sections_config(raw_config_sections) |
| 889 | |
| 890 | sections = [] |
| 891 | with open(metadata_file_path, "r") as metadata_file: |
| 892 | metadata_lines = [line for line in metadata_file] |
| 893 | |
| 894 | config_metadata_sections_idx = 0 |
| 895 | curr_metadata_section = bytearray() |
| 896 | |
| 897 | for idx, line_content in enumerate(metadata_lines): |
| 898 | # Add one to the index to convert from the zero-indexing of the |
| 899 | # enumerate() function to the one-indexing used by humans when |
| 900 | # viewing a text file. |
| 901 | curr_line_number = idx + 1 |
| 902 | |
| 903 | # If there are no more sections, simply append the line. |
| 904 | if config_metadata_sections_idx + 1 >= len(parsed_sections): |
| 905 | curr_metadata_section += bytearray(line_content, "utf8") |
| 906 | continue |
| 907 | |
| 908 | next_section_line_number = parsed_sections[ |
| 909 | config_metadata_sections_idx + 1 |
| 910 | ].line |
| 911 | |
| 912 | # If the next section begins at the current line, create a |
| 913 | # section with the metadata we gathered so far. |
| 914 | if curr_line_number >= next_section_line_number: |
| 915 | # Flushing the metadata of the current section. |
| 916 | sections.append( |
| 917 | _LttngMetadataStreamSection( |
| 918 | parsed_sections[config_metadata_sections_idx].timestamp, |
| 919 | bytes(curr_metadata_section), |
| 920 | ) |
| 921 | ) |
| 922 | |
| 923 | # Move to the next section. |
| 924 | config_metadata_sections_idx += 1 |
| 925 | |
| 926 | # Clear old content and append current line for the next section. |
| 927 | curr_metadata_section.clear() |
| 928 | curr_metadata_section += bytearray(line_content, "utf8") |
| 929 | |
| 930 | # Append any empty sections. |
| 931 | while parsed_sections[config_metadata_sections_idx].is_empty: |
| 932 | sections.append( |
| 933 | _LttngMetadataStreamSection( |
| 934 | parsed_sections[config_metadata_sections_idx].timestamp, None |
| 935 | ) |
| 936 | ) |
| 937 | config_metadata_sections_idx += 1 |
| 938 | else: |
| 939 | # Append line_content to the current metadata section. |
| 940 | curr_metadata_section += bytearray(line_content, "utf8") |
| 941 | |
| 942 | # We iterated over all the lines of the metadata file. Close the current section. |
| 943 | sections.append( |
| 944 | _LttngMetadataStreamSection( |
| 945 | parsed_sections[config_metadata_sections_idx].timestamp, |
| 946 | bytes(curr_metadata_section), |
| 947 | ) |
| 948 | ) |
| 949 | |
| 950 | return sections |
| 951 | |
| 952 | |
| 953 | # An LTTng trace, a sequence of LTTng data streams. |
| 954 | class LttngTrace(collections.abc.Sequence): |
| 955 | def __init__(self, trace_dir, metadata_sections, beacons): |
| 956 | assert os.path.isdir(trace_dir) |
| 957 | self._path = trace_dir |
| 958 | self._create_metadata_stream(trace_dir, metadata_sections) |
| 959 | self._create_data_streams(trace_dir, beacons) |
| 960 | logging.info('Built trace: path="{}"'.format(trace_dir)) |
| 961 | |
| 962 | def _create_data_streams(self, trace_dir, beacons): |
| 963 | data_stream_paths = [] |
| 964 | |
| 965 | for filename in os.listdir(trace_dir): |
| 966 | path = os.path.join(trace_dir, filename) |
| 967 | |
| 968 | if not os.path.isfile(path): |
| 969 | continue |
| 970 | |
| 971 | if filename.startswith("."): |
| 972 | continue |
| 973 | |
| 974 | if filename == "metadata": |
| 975 | continue |
| 976 | |
| 977 | data_stream_paths.append(path) |
| 978 | |
| 979 | data_stream_paths.sort() |
| 980 | self._data_streams = [] |
| 981 | |
| 982 | for data_stream_path in data_stream_paths: |
| 983 | stream_name = os.path.basename(data_stream_path) |
| 984 | this_stream_beacons = None |
| 985 | |
| 986 | if beacons is not None and stream_name in beacons: |
| 987 | this_stream_beacons = beacons[stream_name] |
| 988 | |
| 989 | self._data_streams.append( |
| 990 | _LttngDataStream(data_stream_path, this_stream_beacons) |
| 991 | ) |
| 992 | |
| 993 | def _create_metadata_stream(self, trace_dir, config_metadata_sections): |
| 994 | metadata_path = os.path.join(trace_dir, "metadata") |
| 995 | metadata_sections = [] |
| 996 | |
| 997 | if config_metadata_sections is None: |
| 998 | with open(metadata_path, "rb") as metadata_file: |
| 999 | metadata_sections.append( |
| 1000 | _LttngMetadataStreamSection(0, metadata_file.read()) |
| 1001 | ) |
| 1002 | else: |
| 1003 | metadata_sections = _split_metadata_sections( |
| 1004 | metadata_path, config_metadata_sections |
| 1005 | ) |
| 1006 | |
| 1007 | self._metadata_stream = _LttngMetadataStream(metadata_path, metadata_sections) |
| 1008 | |
| 1009 | @property |
| 1010 | def path(self): |
| 1011 | return self._path |
| 1012 | |
| 1013 | @property |
| 1014 | def metadata_stream(self): |
| 1015 | return self._metadata_stream |
| 1016 | |
| 1017 | def __getitem__(self, index): |
| 1018 | return self._data_streams[index] |
| 1019 | |
| 1020 | def __len__(self): |
| 1021 | return len(self._data_streams) |
| 1022 | |
| 1023 | |
| 1024 | # The state of a single data stream. |
| 1025 | class _LttngLiveViewerSessionDataStreamState: |
| 1026 | def __init__(self, ts_state, info, data_stream, metadata_stream_id): |
| 1027 | self._ts_state = ts_state |
| 1028 | self._info = info |
| 1029 | self._data_stream = data_stream |
| 1030 | self._metadata_stream_id = metadata_stream_id |
| 1031 | self._cur_index_entry_index = 0 |
| 1032 | fmt = 'Built data stream state: id={}, ts-id={}, ts-name="{}", path="{}"' |
| 1033 | logging.info( |
| 1034 | fmt.format( |
| 1035 | info.id, |
| 1036 | ts_state.tracing_session_descriptor.info.tracing_session_id, |
| 1037 | ts_state.tracing_session_descriptor.info.name, |
| 1038 | data_stream.path, |
| 1039 | ) |
| 1040 | ) |
| 1041 | |
| 1042 | @property |
| 1043 | def tracing_session_state(self): |
| 1044 | return self._ts_state |
| 1045 | |
| 1046 | @property |
| 1047 | def info(self): |
| 1048 | return self._info |
| 1049 | |
| 1050 | @property |
| 1051 | def data_stream(self): |
| 1052 | return self._data_stream |
| 1053 | |
| 1054 | @property |
| 1055 | def cur_index_entry(self): |
| 1056 | if self._cur_index_entry_index == len(self._data_stream.index): |
| 1057 | return |
| 1058 | |
| 1059 | return self._data_stream.index[self._cur_index_entry_index] |
| 1060 | |
| 1061 | def goto_next_index_entry(self): |
| 1062 | self._cur_index_entry_index += 1 |
| 1063 | |
| 1064 | |
| 1065 | # The state of a single metadata stream. |
| 1066 | class _LttngLiveViewerSessionMetadataStreamState: |
| 1067 | def __init__(self, ts_state, info, metadata_stream): |
| 1068 | self._ts_state = ts_state |
| 1069 | self._info = info |
| 1070 | self._metadata_stream = metadata_stream |
| 1071 | self._cur_metadata_stream_section_index = 0 |
| 1072 | if len(metadata_stream.sections) > 1: |
| 1073 | self._next_metadata_stream_section_timestamp = metadata_stream.sections[ |
| 1074 | 1 |
| 1075 | ].timestamp |
| 1076 | else: |
| 1077 | self._next_metadata_stream_section_timestamp = None |
| 1078 | |
| 1079 | self._is_sent = False |
| 1080 | fmt = 'Built metadata stream state: id={}, ts-id={}, ts-name="{}", path="{}"' |
| 1081 | logging.info( |
| 1082 | fmt.format( |
| 1083 | info.id, |
| 1084 | ts_state.tracing_session_descriptor.info.tracing_session_id, |
| 1085 | ts_state.tracing_session_descriptor.info.name, |
| 1086 | metadata_stream.path, |
| 1087 | ) |
| 1088 | ) |
| 1089 | |
| 1090 | @property |
| 1091 | def info(self): |
| 1092 | return self._info |
| 1093 | |
| 1094 | @property |
| 1095 | def metadata_stream(self): |
| 1096 | return self._metadata_stream |
| 1097 | |
| 1098 | @property |
| 1099 | def is_sent(self): |
| 1100 | return self._is_sent |
| 1101 | |
| 1102 | @is_sent.setter |
| 1103 | def is_sent(self, value): |
| 1104 | self._is_sent = value |
| 1105 | |
| 1106 | @property |
| 1107 | def cur_section(self): |
| 1108 | fmt = "Get current metadata section: section-idx={}" |
| 1109 | logging.info(fmt.format(self._cur_metadata_stream_section_index)) |
| 1110 | if self._cur_metadata_stream_section_index == len( |
| 1111 | self._metadata_stream.sections |
| 1112 | ): |
| 1113 | return |
| 1114 | |
| 1115 | return self._metadata_stream.sections[self._cur_metadata_stream_section_index] |
| 1116 | |
| 1117 | def goto_next_section(self): |
| 1118 | self._cur_metadata_stream_section_index += 1 |
| 1119 | if self.cur_section: |
| 1120 | self._next_metadata_stream_section_timestamp = self.cur_section.timestamp |
| 1121 | else: |
| 1122 | self._next_metadata_stream_section_timestamp = None |
| 1123 | |
| 1124 | @property |
| 1125 | def next_section_timestamp(self): |
| 1126 | return self._next_metadata_stream_section_timestamp |
| 1127 | |
| 1128 | |
| 1129 | # A tracing session descriptor. |
| 1130 | # |
| 1131 | # In the constructor, `traces` is a list of LTTng traces (`LttngTrace` |
| 1132 | # objects). |
| 1133 | class LttngTracingSessionDescriptor: |
| 1134 | def __init__( |
| 1135 | self, name, tracing_session_id, hostname, live_timer_freq, client_count, traces |
| 1136 | ): |
| 1137 | for trace in traces: |
| 1138 | if name not in trace.path: |
| 1139 | fmt = "Tracing session name must be part of every trace path (`{}` not found in `{}`)" |
| 1140 | raise ValueError(fmt.format(name, trace.path)) |
| 1141 | |
| 1142 | self._traces = traces |
| 1143 | stream_count = sum([len(t) + 1 for t in traces]) |
| 1144 | self._info = _LttngLiveViewerTracingSessionInfo( |
| 1145 | tracing_session_id, |
| 1146 | live_timer_freq, |
| 1147 | client_count, |
| 1148 | stream_count, |
| 1149 | hostname, |
| 1150 | name, |
| 1151 | ) |
| 1152 | |
| 1153 | @property |
| 1154 | def traces(self): |
| 1155 | return self._traces |
| 1156 | |
| 1157 | @property |
| 1158 | def info(self): |
| 1159 | return self._info |
| 1160 | |
| 1161 | |
| 1162 | # The state of a tracing session. |
| 1163 | class _LttngLiveViewerSessionTracingSessionState: |
| 1164 | def __init__(self, tc_descr, base_stream_id): |
| 1165 | self._tc_descr = tc_descr |
| 1166 | self._stream_infos = [] |
| 1167 | self._ds_states = {} |
| 1168 | self._ms_states = {} |
| 1169 | stream_id = base_stream_id |
| 1170 | |
| 1171 | for trace in tc_descr.traces: |
| 1172 | trace_id = stream_id * 1000 |
| 1173 | |
| 1174 | # Metadata stream -> stream info and metadata stream state |
| 1175 | info = _LttngLiveViewerStreamInfo( |
| 1176 | stream_id, trace_id, True, trace.metadata_stream.path, "metadata" |
| 1177 | ) |
| 1178 | self._stream_infos.append(info) |
| 1179 | self._ms_states[stream_id] = _LttngLiveViewerSessionMetadataStreamState( |
| 1180 | self, info, trace.metadata_stream |
| 1181 | ) |
| 1182 | metadata_stream_id = stream_id |
| 1183 | stream_id += 1 |
| 1184 | |
| 1185 | # Data streams -> stream infos and data stream states |
| 1186 | for data_stream in trace: |
| 1187 | info = _LttngLiveViewerStreamInfo( |
| 1188 | stream_id, |
| 1189 | trace_id, |
| 1190 | False, |
| 1191 | data_stream.path, |
| 1192 | data_stream.channel_name, |
| 1193 | ) |
| 1194 | self._stream_infos.append(info) |
| 1195 | self._ds_states[stream_id] = _LttngLiveViewerSessionDataStreamState( |
| 1196 | self, info, data_stream, metadata_stream_id |
| 1197 | ) |
| 1198 | stream_id += 1 |
| 1199 | |
| 1200 | self._is_attached = False |
| 1201 | fmt = 'Built tracing session state: id={}, name="{}"' |
| 1202 | logging.info(fmt.format(tc_descr.info.tracing_session_id, tc_descr.info.name)) |
| 1203 | |
| 1204 | @property |
| 1205 | def tracing_session_descriptor(self): |
| 1206 | return self._tc_descr |
| 1207 | |
| 1208 | @property |
| 1209 | def data_stream_states(self): |
| 1210 | return self._ds_states |
| 1211 | |
| 1212 | @property |
| 1213 | def metadata_stream_states(self): |
| 1214 | return self._ms_states |
| 1215 | |
| 1216 | @property |
| 1217 | def stream_infos(self): |
| 1218 | return self._stream_infos |
| 1219 | |
| 1220 | @property |
| 1221 | def has_new_metadata(self): |
| 1222 | return any([not ms.is_sent for ms in self._ms_states.values()]) |
| 1223 | |
| 1224 | @property |
| 1225 | def is_attached(self): |
| 1226 | return self._is_attached |
| 1227 | |
| 1228 | @is_attached.setter |
| 1229 | def is_attached(self, value): |
| 1230 | self._is_attached = value |
| 1231 | |
| 1232 | |
| 1233 | def needs_new_metadata_section(metadata_stream_state, latest_timestamp): |
| 1234 | if metadata_stream_state.next_section_timestamp is None: |
| 1235 | return False |
| 1236 | |
| 1237 | if latest_timestamp >= metadata_stream_state.next_section_timestamp: |
| 1238 | return True |
| 1239 | else: |
| 1240 | return False |
| 1241 | |
| 1242 | |
| 1243 | # An LTTng live viewer session manages a view on tracing sessions |
| 1244 | # and replies to commands accordingly. |
| 1245 | class _LttngLiveViewerSession: |
| 1246 | def __init__( |
| 1247 | self, |
| 1248 | viewer_session_id, |
| 1249 | tracing_session_descriptors, |
| 1250 | max_query_data_response_size, |
| 1251 | ): |
| 1252 | self._viewer_session_id = viewer_session_id |
| 1253 | self._ts_states = {} |
| 1254 | self._stream_states = {} |
| 1255 | self._max_query_data_response_size = max_query_data_response_size |
| 1256 | total_stream_infos = 0 |
| 1257 | |
| 1258 | for ts_descr in tracing_session_descriptors: |
| 1259 | ts_state = _LttngLiveViewerSessionTracingSessionState( |
| 1260 | ts_descr, total_stream_infos |
| 1261 | ) |
| 1262 | ts_id = ts_state.tracing_session_descriptor.info.tracing_session_id |
| 1263 | self._ts_states[ts_id] = ts_state |
| 1264 | total_stream_infos += len(ts_state.stream_infos) |
| 1265 | |
| 1266 | # Update session's stream states to have the new states |
| 1267 | self._stream_states.update(ts_state.data_stream_states) |
| 1268 | self._stream_states.update(ts_state.metadata_stream_states) |
| 1269 | |
| 1270 | self._command_handlers = { |
| 1271 | _LttngLiveViewerAttachToTracingSessionCommand: self._handle_attach_to_tracing_session_command, |
| 1272 | _LttngLiveViewerCreateViewerSessionCommand: self._handle_create_viewer_session_command, |
| 1273 | _LttngLiveViewerDetachFromTracingSessionCommand: self._handle_detach_from_tracing_session_command, |
| 1274 | _LttngLiveViewerGetDataStreamPacketDataCommand: self._handle_get_data_stream_packet_data_command, |
| 1275 | _LttngLiveViewerGetMetadataStreamDataCommand: self._handle_get_metadata_stream_data_command, |
| 1276 | _LttngLiveViewerGetNewStreamInfosCommand: self._handle_get_new_stream_infos_command, |
| 1277 | _LttngLiveViewerGetNextDataStreamIndexEntryCommand: self._handle_get_next_data_stream_index_entry_command, |
| 1278 | _LttngLiveViewerGetTracingSessionInfosCommand: self._handle_get_tracing_session_infos_command, |
| 1279 | } |
| 1280 | |
| 1281 | @property |
| 1282 | def viewer_session_id(self): |
| 1283 | return self._viewer_session_id |
| 1284 | |
| 1285 | def _get_tracing_session_state(self, tracing_session_id): |
| 1286 | if tracing_session_id not in self._ts_states: |
| 1287 | raise UnexpectedInput( |
| 1288 | "Unknown tracing session ID {}".format(tracing_session_id) |
| 1289 | ) |
| 1290 | |
| 1291 | return self._ts_states[tracing_session_id] |
| 1292 | |
| 1293 | def _get_stream_state(self, stream_id): |
| 1294 | if stream_id not in self._stream_states: |
| 1295 | UnexpectedInput("Unknown stream ID {}".format(stream_id)) |
| 1296 | |
| 1297 | return self._stream_states[stream_id] |
| 1298 | |
| 1299 | def handle_command(self, cmd): |
| 1300 | logging.info( |
| 1301 | "Handling command in viewer session: cmd-cls-name={}".format( |
| 1302 | cmd.__class__.__name__ |
| 1303 | ) |
| 1304 | ) |
| 1305 | cmd_type = type(cmd) |
| 1306 | |
| 1307 | if cmd_type not in self._command_handlers: |
| 1308 | raise UnexpectedInput( |
| 1309 | "Unexpected command: cmd-cls-name={}".format(cmd.__class__.__name__) |
| 1310 | ) |
| 1311 | |
| 1312 | return self._command_handlers[cmd_type](cmd) |
| 1313 | |
| 1314 | def _handle_attach_to_tracing_session_command(self, cmd): |
| 1315 | fmt = 'Handling "attach to tracing session" command: ts-id={}, offset={}, seek-type={}' |
| 1316 | logging.info(fmt.format(cmd.tracing_session_id, cmd.offset, cmd.seek_type)) |
| 1317 | ts_state = self._get_tracing_session_state(cmd.tracing_session_id) |
| 1318 | info = ts_state.tracing_session_descriptor.info |
| 1319 | |
| 1320 | if ts_state.is_attached: |
| 1321 | raise UnexpectedInput( |
| 1322 | "Cannot attach to tracing session `{}`: viewer is already attached".format( |
| 1323 | info.name |
| 1324 | ) |
| 1325 | ) |
| 1326 | |
| 1327 | ts_state.is_attached = True |
| 1328 | status = _LttngLiveViewerAttachToTracingSessionReply.Status.OK |
| 1329 | return _LttngLiveViewerAttachToTracingSessionReply( |
| 1330 | status, ts_state.stream_infos |
| 1331 | ) |
| 1332 | |
| 1333 | def _handle_detach_from_tracing_session_command(self, cmd): |
| 1334 | fmt = 'Handling "detach from tracing session" command: ts-id={}' |
| 1335 | logging.info(fmt.format(cmd.tracing_session_id)) |
| 1336 | ts_state = self._get_tracing_session_state(cmd.tracing_session_id) |
| 1337 | info = ts_state.tracing_session_descriptor.info |
| 1338 | |
| 1339 | if not ts_state.is_attached: |
| 1340 | raise UnexpectedInput( |
| 1341 | "Cannot detach to tracing session `{}`: viewer is not attached".format( |
| 1342 | info.name |
| 1343 | ) |
| 1344 | ) |
| 1345 | |
| 1346 | ts_state.is_attached = False |
| 1347 | status = _LttngLiveViewerDetachFromTracingSessionReply.Status.OK |
| 1348 | return _LttngLiveViewerDetachFromTracingSessionReply(status) |
| 1349 | |
| 1350 | def _handle_get_next_data_stream_index_entry_command(self, cmd): |
| 1351 | fmt = 'Handling "get next data stream index entry" command: stream-id={}' |
| 1352 | logging.info(fmt.format(cmd.stream_id)) |
| 1353 | stream_state = self._get_stream_state(cmd.stream_id) |
| 1354 | metadata_stream_state = self._get_stream_state(stream_state._metadata_stream_id) |
| 1355 | |
| 1356 | if type(stream_state) is not _LttngLiveViewerSessionDataStreamState: |
| 1357 | raise UnexpectedInput( |
| 1358 | "Stream with ID {} is not a data stream".format(cmd.stream_id) |
| 1359 | ) |
| 1360 | |
| 1361 | if stream_state.cur_index_entry is None: |
| 1362 | # The viewer is done reading this stream |
| 1363 | status = _LttngLiveViewerGetNextDataStreamIndexEntryReply.Status.HUP |
| 1364 | |
| 1365 | # Dummy data stream index entry to use with the `HUP` status |
| 1366 | # (the reply needs one, but the viewer ignores it) |
| 1367 | index_entry = _LttngDataStreamIndexEntry(0, 0, 0, 0, 0, 0, 0) |
| 1368 | |
| 1369 | return _LttngLiveViewerGetNextDataStreamIndexEntryReply( |
| 1370 | status, index_entry, False, False |
| 1371 | ) |
| 1372 | |
| 1373 | timestamp_begin = _get_entry_timestamp_begin(stream_state.cur_index_entry) |
| 1374 | |
| 1375 | if needs_new_metadata_section(metadata_stream_state, timestamp_begin): |
| 1376 | metadata_stream_state.is_sent = False |
| 1377 | metadata_stream_state.goto_next_section() |
| 1378 | |
| 1379 | # The viewer only checks the `has_new_metadata` flag if the |
| 1380 | # reply's status is `OK`, so we need to provide an index here |
| 1381 | has_new_metadata = stream_state.tracing_session_state.has_new_metadata |
| 1382 | if type(stream_state.cur_index_entry) is _LttngDataStreamIndexEntry: |
| 1383 | status = _LttngLiveViewerGetNextDataStreamIndexEntryReply.Status.OK |
| 1384 | else: |
| 1385 | assert type(stream_state.cur_index_entry) is _LttngDataStreamBeaconEntry |
| 1386 | status = _LttngLiveViewerGetNextDataStreamIndexEntryReply.Status.INACTIVE |
| 1387 | |
| 1388 | reply = _LttngLiveViewerGetNextDataStreamIndexEntryReply( |
| 1389 | status, stream_state.cur_index_entry, has_new_metadata, False |
| 1390 | ) |
| 1391 | stream_state.goto_next_index_entry() |
| 1392 | return reply |
| 1393 | |
| 1394 | def _handle_get_data_stream_packet_data_command(self, cmd): |
| 1395 | fmt = 'Handling "get data stream packet data" command: stream-id={}, offset={}, req-length={}' |
| 1396 | logging.info(fmt.format(cmd.stream_id, cmd.offset, cmd.req_length)) |
| 1397 | stream_state = self._get_stream_state(cmd.stream_id) |
| 1398 | data_response_length = cmd.req_length |
| 1399 | |
| 1400 | if type(stream_state) is not _LttngLiveViewerSessionDataStreamState: |
| 1401 | raise UnexpectedInput( |
| 1402 | "Stream with ID {} is not a data stream".format(cmd.stream_id) |
| 1403 | ) |
| 1404 | |
| 1405 | if stream_state.tracing_session_state.has_new_metadata: |
| 1406 | status = _LttngLiveViewerGetDataStreamPacketDataReply.Status.ERROR |
| 1407 | return _LttngLiveViewerGetDataStreamPacketDataReply( |
| 1408 | status, bytes(), True, False |
| 1409 | ) |
| 1410 | |
| 1411 | if self._max_query_data_response_size: |
| 1412 | # Enforce a server side limit on the query requested length. |
| 1413 | # To ensure that the transaction terminate take the minimum of both |
| 1414 | # value. |
| 1415 | data_response_length = min( |
| 1416 | cmd.req_length, self._max_query_data_response_size |
| 1417 | ) |
| 1418 | fmt = 'Limiting "get data stream packet data" command: req-length={} actual response size={}' |
| 1419 | logging.info(fmt.format(cmd.req_length, data_response_length)) |
| 1420 | |
| 1421 | data = stream_state.data_stream.get_data(cmd.offset, data_response_length) |
| 1422 | status = _LttngLiveViewerGetDataStreamPacketDataReply.Status.OK |
| 1423 | return _LttngLiveViewerGetDataStreamPacketDataReply(status, data, False, False) |
| 1424 | |
| 1425 | def _handle_get_metadata_stream_data_command(self, cmd): |
| 1426 | fmt = 'Handling "get metadata stream data" command: stream-id={}' |
| 1427 | logging.info(fmt.format(cmd.stream_id)) |
| 1428 | metadata_stream_state = self._get_stream_state(cmd.stream_id) |
| 1429 | |
| 1430 | if ( |
| 1431 | type(metadata_stream_state) |
| 1432 | is not _LttngLiveViewerSessionMetadataStreamState |
| 1433 | ): |
| 1434 | raise UnexpectedInput( |
| 1435 | "Stream with ID {} is not a metadata stream".format(cmd.stream_id) |
| 1436 | ) |
| 1437 | |
| 1438 | if metadata_stream_state.is_sent: |
| 1439 | status = _LttngLiveViewerGetMetadataStreamDataContentReply.Status.NO_NEW |
| 1440 | return _LttngLiveViewerGetMetadataStreamDataContentReply(status, bytes()) |
| 1441 | |
| 1442 | metadata_stream_state.is_sent = True |
| 1443 | status = _LttngLiveViewerGetMetadataStreamDataContentReply.Status.OK |
| 1444 | metadata_section = metadata_stream_state.cur_section |
| 1445 | assert metadata_section is not None |
| 1446 | |
| 1447 | # If we are sending an empty section, ready the next one right away. |
| 1448 | if len(metadata_section.data) == 0: |
| 1449 | metadata_stream_state.is_sent = False |
| 1450 | metadata_stream_state.goto_next_section() |
| 1451 | |
| 1452 | fmt = 'Replying to "get metadata stream data" command: metadata-size={}' |
| 1453 | logging.info(fmt.format(len(metadata_section.data))) |
| 1454 | return _LttngLiveViewerGetMetadataStreamDataContentReply( |
| 1455 | status, metadata_section.data |
| 1456 | ) |
| 1457 | |
| 1458 | def _handle_get_new_stream_infos_command(self, cmd): |
| 1459 | fmt = 'Handling "get new stream infos" command: ts-id={}' |
| 1460 | logging.info(fmt.format(cmd.tracing_session_id)) |
| 1461 | |
| 1462 | # As of this version, all the tracing session's stream infos are |
| 1463 | # always given to the viewer when sending the "attach to tracing |
| 1464 | # session" reply, so there's nothing new here. Return the `HUP` |
| 1465 | # status as, if we're handling this command, the viewer consumed |
| 1466 | # all the existing data streams. |
| 1467 | status = _LttngLiveViewerGetNewStreamInfosReply.Status.HUP |
| 1468 | return _LttngLiveViewerGetNewStreamInfosReply(status, []) |
| 1469 | |
| 1470 | def _handle_get_tracing_session_infos_command(self, cmd): |
| 1471 | logging.info('Handling "get tracing session infos" command.') |
| 1472 | infos = [ |
| 1473 | tss.tracing_session_descriptor.info for tss in self._ts_states.values() |
| 1474 | ] |
| 1475 | infos.sort(key=lambda info: info.name) |
| 1476 | return _LttngLiveViewerGetTracingSessionInfosReply(infos) |
| 1477 | |
| 1478 | def _handle_create_viewer_session_command(self, cmd): |
| 1479 | logging.info('Handling "create viewer session" command.') |
| 1480 | status = _LttngLiveViewerCreateViewerSessionReply.Status.OK |
| 1481 | |
| 1482 | # This does nothing here. In the LTTng relay daemon, it |
| 1483 | # allocates the viewer session's state. |
| 1484 | return _LttngLiveViewerCreateViewerSessionReply(status) |
| 1485 | |
| 1486 | |
| 1487 | # An LTTng live TCP server. |
| 1488 | # |
| 1489 | # On creation, it binds to `localhost` on the TCP port `port` if not `None`, or |
| 1490 | # on an OS-assigned TCP port otherwise. It writes the decimal TCP port number |
| 1491 | # to a temporary port file. It renames the temporary port file to |
| 1492 | # `port_filename`. |
| 1493 | # |
| 1494 | # `tracing_session_descriptors` is a list of tracing session descriptors |
| 1495 | # (`LttngTracingSessionDescriptor`) to serve. |
| 1496 | # |
| 1497 | # This server accepts a single viewer (client). |
| 1498 | # |
| 1499 | # When the viewer closes the connection, the server's constructor |
| 1500 | # returns. |
| 1501 | class LttngLiveServer: |
| 1502 | def __init__( |
| 1503 | self, |
| 1504 | port, |
| 1505 | port_filename, |
| 1506 | tracing_session_descriptors, |
| 1507 | max_query_data_response_size, |
| 1508 | ): |
| 1509 | logging.info("Server configuration:") |
| 1510 | |
| 1511 | logging.info(" Port file name: `{}`".format(port_filename)) |
| 1512 | |
| 1513 | if max_query_data_response_size is not None: |
| 1514 | logging.info( |
| 1515 | " Maximum response data query size: `{}`".format( |
| 1516 | max_query_data_response_size |
| 1517 | ) |
| 1518 | ) |
| 1519 | |
| 1520 | for ts_descr in tracing_session_descriptors: |
| 1521 | info = ts_descr.info |
| 1522 | fmt = ' TS descriptor: name="{}", id={}, hostname="{}", live-timer-freq={}, client-count={}, stream-count={}:' |
| 1523 | logging.info( |
| 1524 | fmt.format( |
| 1525 | info.name, |
| 1526 | info.tracing_session_id, |
| 1527 | info.hostname, |
| 1528 | info.live_timer_freq, |
| 1529 | info.client_count, |
| 1530 | info.stream_count, |
| 1531 | ) |
| 1532 | ) |
| 1533 | |
| 1534 | for trace in ts_descr.traces: |
| 1535 | logging.info(' Trace: path="{}"'.format(trace.path)) |
| 1536 | |
| 1537 | self._ts_descriptors = tracing_session_descriptors |
| 1538 | self._max_query_data_response_size = max_query_data_response_size |
| 1539 | self._sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
| 1540 | self._codec = _LttngLiveViewerProtocolCodec() |
| 1541 | |
| 1542 | # Port 0: OS assigns an unused port |
| 1543 | serv_addr = ("localhost", port if port is not None else 0) |
| 1544 | self._sock.bind(serv_addr) |
| 1545 | self._write_port_to_file(port_filename) |
| 1546 | |
| 1547 | try: |
| 1548 | self._listen() |
| 1549 | finally: |
| 1550 | self._sock.close() |
| 1551 | logging.info("Closed connection and socket.") |
| 1552 | |
| 1553 | @property |
| 1554 | def _server_port(self): |
| 1555 | return self._sock.getsockname()[1] |
| 1556 | |
| 1557 | def _recv_command(self): |
| 1558 | data = bytes() |
| 1559 | |
| 1560 | while True: |
| 1561 | logging.info("Waiting for viewer command.") |
| 1562 | buf = self._conn.recv(128) |
| 1563 | |
| 1564 | if not buf: |
| 1565 | logging.info("Client closed connection.") |
| 1566 | |
| 1567 | if data: |
| 1568 | raise UnexpectedInput( |
| 1569 | "Client closed connection after having sent {} command bytes.".format( |
| 1570 | len(data) |
| 1571 | ) |
| 1572 | ) |
| 1573 | |
| 1574 | return |
| 1575 | |
| 1576 | logging.info("Received data from viewer: length={}".format(len(buf))) |
| 1577 | |
| 1578 | data += buf |
| 1579 | |
| 1580 | try: |
| 1581 | cmd = self._codec.decode(data) |
| 1582 | except struct.error as exc: |
| 1583 | raise UnexpectedInput("Malformed command: {}".format(exc)) from exc |
| 1584 | |
| 1585 | if cmd is not None: |
| 1586 | logging.info( |
| 1587 | "Received command from viewer: cmd-cls-name={}".format( |
| 1588 | cmd.__class__.__name__ |
| 1589 | ) |
| 1590 | ) |
| 1591 | return cmd |
| 1592 | |
| 1593 | def _send_reply(self, reply): |
| 1594 | data = self._codec.encode(reply) |
| 1595 | logging.info( |
| 1596 | "Sending reply to viewer: reply-cls-name={}, length={}".format( |
| 1597 | reply.__class__.__name__, len(data) |
| 1598 | ) |
| 1599 | ) |
| 1600 | self._conn.sendall(data) |
| 1601 | |
| 1602 | def _handle_connection(self): |
| 1603 | # First command must be "connect" |
| 1604 | cmd = self._recv_command() |
| 1605 | |
| 1606 | if type(cmd) is not _LttngLiveViewerConnectCommand: |
| 1607 | raise UnexpectedInput( |
| 1608 | 'First command is not "connect": cmd-cls-name={}'.format( |
| 1609 | cmd.__class__.__name__ |
| 1610 | ) |
| 1611 | ) |
| 1612 | |
| 1613 | # Create viewer session (arbitrary ID 23) |
| 1614 | logging.info( |
| 1615 | "LTTng live viewer connected: version={}.{}".format(cmd.major, cmd.minor) |
| 1616 | ) |
| 1617 | viewer_session = _LttngLiveViewerSession( |
| 1618 | 23, self._ts_descriptors, self._max_query_data_response_size |
| 1619 | ) |
| 1620 | |
| 1621 | # Send "connect" reply |
| 1622 | self._send_reply( |
| 1623 | _LttngLiveViewerConnectReply(viewer_session.viewer_session_id, 2, 10) |
| 1624 | ) |
| 1625 | |
| 1626 | # Make the viewer session handle the remaining commands |
| 1627 | while True: |
| 1628 | cmd = self._recv_command() |
| 1629 | |
| 1630 | if cmd is None: |
| 1631 | # Connection closed (at an expected location within the |
| 1632 | # conversation) |
| 1633 | return |
| 1634 | |
| 1635 | self._send_reply(viewer_session.handle_command(cmd)) |
| 1636 | |
| 1637 | def _listen(self): |
| 1638 | logging.info("Listening: port={}".format(self._server_port)) |
| 1639 | # Backlog must be present for Python version < 3.5. |
| 1640 | # 128 is an arbitrary number since we expect only 1 connection anyway. |
| 1641 | self._sock.listen(128) |
| 1642 | self._conn, viewer_addr = self._sock.accept() |
| 1643 | logging.info( |
| 1644 | "Accepted viewer: addr={}:{}".format(viewer_addr[0], viewer_addr[1]) |
| 1645 | ) |
| 1646 | |
| 1647 | try: |
| 1648 | self._handle_connection() |
| 1649 | finally: |
| 1650 | self._conn.close() |
| 1651 | |
| 1652 | def _write_port_to_file(self, port_filename): |
| 1653 | # Write the port number to a temporary file. |
| 1654 | with tempfile.NamedTemporaryFile(mode="w", delete=False) as tmp_port_file: |
| 1655 | print(self._server_port, end="", file=tmp_port_file) |
| 1656 | |
| 1657 | # Rename temporary file to real file |
| 1658 | os.replace(tmp_port_file.name, port_filename) |
| 1659 | logging.info( |
| 1660 | 'Renamed port file: src-path="{}", dst-path="{}"'.format( |
| 1661 | tmp_port_file.name, port_filename |
| 1662 | ) |
| 1663 | ) |
| 1664 | |
| 1665 | |
| 1666 | def _session_descriptors_from_path(sessions_filename, trace_path_prefix): |
| 1667 | # File format is: |
| 1668 | # |
| 1669 | # [ |
| 1670 | # { |
| 1671 | # "name": "my-session", |
| 1672 | # "id": 17, |
| 1673 | # "hostname": "myhost", |
| 1674 | # "live-timer-freq": 1000000, |
| 1675 | # "client-count": 23, |
| 1676 | # "traces": [ |
| 1677 | # { |
| 1678 | # "path": "lol" |
| 1679 | # }, |
| 1680 | # { |
| 1681 | # "path": "meow/mix", |
| 1682 | # "beacons": { |
| 1683 | # "my_stream": [ 5235787, 728375283 ] |
| 1684 | # }, |
| 1685 | # "metadata-sections": [ |
| 1686 | # { |
| 1687 | # "line": 1, |
| 1688 | # "timestamp": 0 |
| 1689 | # } |
| 1690 | # ] |
| 1691 | # } |
| 1692 | # ] |
| 1693 | # } |
| 1694 | # ] |
| 1695 | with open(sessions_filename, "r") as sessions_file: |
| 1696 | params = json.load(sessions_file) |
| 1697 | |
| 1698 | sessions = [] |
| 1699 | |
| 1700 | for session in params: |
| 1701 | name = session["name"] |
| 1702 | tracing_session_id = session["id"] |
| 1703 | hostname = session["hostname"] |
| 1704 | live_timer_freq = session["live-timer-freq"] |
| 1705 | client_count = session["client-count"] |
| 1706 | traces = [] |
| 1707 | |
| 1708 | for trace in session["traces"]: |
| 1709 | metadata_sections = trace.get("metadata-sections") |
| 1710 | beacons = trace.get("beacons") |
| 1711 | path = trace["path"] |
| 1712 | |
| 1713 | if not os.path.isabs(path): |
| 1714 | path = os.path.join(trace_path_prefix, path) |
| 1715 | |
| 1716 | traces.append(LttngTrace(path, metadata_sections, beacons)) |
| 1717 | |
| 1718 | sessions.append( |
| 1719 | LttngTracingSessionDescriptor( |
| 1720 | name, |
| 1721 | tracing_session_id, |
| 1722 | hostname, |
| 1723 | live_timer_freq, |
| 1724 | client_count, |
| 1725 | traces, |
| 1726 | ) |
| 1727 | ) |
| 1728 | |
| 1729 | return sessions |
| 1730 | |
| 1731 | |
| 1732 | def _loglevel_parser(string): |
| 1733 | loglevels = {"info": logging.INFO, "warning": logging.WARNING} |
| 1734 | if string not in loglevels: |
| 1735 | msg = "{} is not a valid loglevel".format(string) |
| 1736 | raise argparse.ArgumentTypeError(msg) |
| 1737 | return loglevels[string] |
| 1738 | |
| 1739 | |
| 1740 | if __name__ == "__main__": |
| 1741 | logging.basicConfig(format="# %(asctime)-25s%(message)s") |
| 1742 | parser = argparse.ArgumentParser( |
| 1743 | description="LTTng-live protocol mocker", add_help=False |
| 1744 | ) |
| 1745 | parser.add_argument( |
| 1746 | "--log-level", |
| 1747 | default="warning", |
| 1748 | choices=["info", "warning"], |
| 1749 | help="The loglevel to be used.", |
| 1750 | ) |
| 1751 | |
| 1752 | loglevel_namespace, remaining_args = parser.parse_known_args() |
| 1753 | logging.getLogger().setLevel(_loglevel_parser(loglevel_namespace.log_level)) |
| 1754 | |
| 1755 | parser.add_argument( |
| 1756 | "--port", |
| 1757 | help="The port to bind to. If missing, use an OS-assigned port..", |
| 1758 | type=int, |
| 1759 | ) |
| 1760 | parser.add_argument( |
| 1761 | "--port-filename", |
| 1762 | help="The final port file. This file is present when the server is ready to receive connection.", |
| 1763 | required=True, |
| 1764 | ) |
| 1765 | parser.add_argument( |
| 1766 | "--max-query-data-response-size", |
| 1767 | type=int, |
| 1768 | help="The maximum size of control data response in bytes", |
| 1769 | ) |
| 1770 | parser.add_argument( |
| 1771 | "--trace-path-prefix", |
| 1772 | type=str, |
| 1773 | help="Prefix to prepend to the trace paths of session configurations", |
| 1774 | ) |
| 1775 | parser.add_argument( |
| 1776 | "--sessions-filename", |
| 1777 | type=str, |
| 1778 | help="Path to a session configuration file", |
| 1779 | ) |
| 1780 | parser.add_argument( |
| 1781 | "-h", |
| 1782 | "--help", |
| 1783 | action="help", |
| 1784 | default=argparse.SUPPRESS, |
| 1785 | help="Show this help message and exit.", |
| 1786 | ) |
| 1787 | |
| 1788 | args = parser.parse_args(args=remaining_args) |
| 1789 | try: |
| 1790 | sessions = _session_descriptors_from_path( |
| 1791 | args.sessions_filename, |
| 1792 | args.trace_path_prefix, |
| 1793 | ) |
| 1794 | LttngLiveServer( |
| 1795 | args.port, args.port_filename, sessions, args.max_query_data_response_size |
| 1796 | ) |
| 1797 | except UnexpectedInput as exc: |
| 1798 | logging.error(str(exc)) |
| 1799 | print(exc, file=sys.stderr) |
| 1800 | sys.exit(1) |