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