src/plugins/text/dmesg/dmesg.c

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
   5  * Copyright 2017 Philippe Proulx <pproulx@efficios.com>
   6  */
   7
   8 #define BT_COMP_LOG_SELF_COMP (dmesg_comp->self_comp)
   9 #define BT_LOG_OUTPUT_LEVEL (dmesg_comp->log_level)
  10 #define BT_LOG_TAG "PLUGIN/SRC.TEXT.DMESG"
  11 #include "logging/comp-logging.h"
  12
  13 #include "dmesg.h"
  14
  15 #include <stdbool.h>
  16 #include <string.h>
  17 #include <ctype.h>
  18 #include <stdio.h>
  19 #include "common/common.h"
  20 #include "common/assert.h"
  21 #include <babeltrace2/babeltrace.h>
  22 #include "compat/utc.h"
  23 #include "compat/stdio.h"
  24 #include <glib.h>
  25 #include "plugins/common/param-validation/param-validation.h"
  26
  27 #define NSEC_PER_USEC 1000UL
  28 #define NSEC_PER_MSEC 1000000UL
  29 #define NSEC_PER_SEC 1000000000ULL
  30 #define USEC_PER_SEC 1000000UL
  31
  32 struct dmesg_component;
  33
  34 struct dmesg_msg_iter {
  35         struct dmesg_component *dmesg_comp;
  36
  37         /* Weak */
  38         bt_self_message_iterator *self_msg_iter;
  39
  40         char *linebuf;
  41         size_t linebuf_len;
  42         FILE *fp;
  43         bt_message *tmp_event_msg;
  44         uint64_t last_clock_value;
  45
  46         enum {
  47                 STATE_EMIT_STREAM_BEGINNING,
  48                 STATE_EMIT_EVENT,
  49                 STATE_EMIT_STREAM_END,
  50                 STATE_DONE,
  51         } state;
  52 };
  53
  54 struct dmesg_component {
  55         bt_logging_level log_level;
  56
  57         struct {
  58                 GString *path;
  59                 bt_bool read_from_stdin;
  60                 bt_bool no_timestamp;
  61         } params;
  62
  63         bt_self_component_source *self_comp_src;
  64         bt_self_component *self_comp;
  65         bt_trace_class *trace_class;
  66         bt_stream_class *stream_class;
  67         bt_event_class *event_class;
  68         bt_trace *trace;
  69         bt_stream *stream;
  70         bt_clock_class *clock_class;
  71 };
  72
  73 static
  74 bt_field_class *create_event_payload_fc(struct dmesg_component *dmesg_comp,
  75                 bt_trace_class *trace_class)
  76 {
  77         bt_field_class *root_fc = NULL;
  78         bt_field_class *fc = NULL;
  79         bt_field_class_structure_append_member_status append_member_status;
  80
  81         root_fc = bt_field_class_structure_create(trace_class);
  82         if (!root_fc) {
  83                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
  84                         "Cannot create an empty structure field class object.");
  85                 goto error;
  86         }
  87
  88         fc = bt_field_class_string_create(trace_class);
  89         if (!fc) {
  90                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
  91                         "Cannot create a string field class object.");
  92                 goto error;
  93         }
  94
  95         append_member_status = bt_field_class_structure_append_member(root_fc,
  96                 "str", fc);
  97         if (append_member_status != BT_FIELD_CLASS_STRUCTURE_APPEND_MEMBER_STATUS_OK) {
  98                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
  99                         "Cannot add `str` member to structure field class: ret=%d",
 100                         append_member_status);
 101                 goto error;
 102         }
 103
 104         goto end;
 105
 106 error:
 107         BT_FIELD_CLASS_PUT_REF_AND_RESET(root_fc);
 108
 109 end:
 110         bt_field_class_put_ref(fc);
 111         return root_fc;
 112 }
 113
 114 static
 115 int create_meta(struct dmesg_component *dmesg_comp, bool has_ts)
 116 {
 117         bt_field_class *fc = NULL;
 118         int ret = 0;
 119
 120         dmesg_comp->trace_class = bt_trace_class_create(dmesg_comp->self_comp);
 121         if (!dmesg_comp->trace_class) {
 122                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 123                         "Cannot create an empty trace class object.");
 124                 goto error;
 125         }
 126
 127         dmesg_comp->stream_class = bt_stream_class_create(
 128                 dmesg_comp->trace_class);
 129         if (!dmesg_comp->stream_class) {
 130                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 131                         "Cannot create a stream class object.");
 132                 goto error;
 133         }
 134
 135         if (has_ts) {
 136                 dmesg_comp->clock_class = bt_clock_class_create(
 137                         dmesg_comp->self_comp);
 138                 if (!dmesg_comp->clock_class) {
 139                         BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 140                                 "Cannot create clock class.");
 141                         goto error;
 142                 }
 143
 144                 /*
 145                  * The `dmesg` timestamp's origin is not the Unix epoch,
 146                  * it's the boot time.
 147                  */
 148                 bt_clock_class_set_origin_is_unix_epoch(dmesg_comp->clock_class,
 149                         BT_FALSE);
 150
 151                 ret = bt_stream_class_set_default_clock_class(
 152                         dmesg_comp->stream_class, dmesg_comp->clock_class);
 153                 if (ret) {
 154                         BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 155                                 "Cannot set stream class's default clock class.");
 156                         goto error;
 157                 }
 158         }
 159
 160         dmesg_comp->event_class = bt_event_class_create(
 161                 dmesg_comp->stream_class);
 162         if (!dmesg_comp->event_class) {
 163                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 164                         "Cannot create an event class object.");
 165                 goto error;
 166         }
 167
 168         ret = bt_event_class_set_name(dmesg_comp->event_class, "string");
 169         if (ret) {
 170                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 171                         "Cannot set event class's name.");
 172                 goto error;
 173         }
 174
 175         fc = create_event_payload_fc(dmesg_comp, dmesg_comp->trace_class);
 176         if (!fc) {
 177                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 178                         "Cannot create event payload field class.");
 179                 goto error;
 180         }
 181
 182         ret = bt_event_class_set_payload_field_class(dmesg_comp->event_class, fc);
 183         if (ret) {
 184                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 185                         "Cannot set event class's event payload field class.");
 186                 goto error;
 187         }
 188
 189         goto end;
 190
 191 error:
 192         ret = -1;
 193
 194 end:
 195         bt_field_class_put_ref(fc);
 196         return ret;
 197 }
 198
 199 static
 200 struct bt_param_validation_map_value_entry_descr dmesg_params[] = {
 201         { "no-extract-timestamp", BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_OPTIONAL, { .type = BT_VALUE_TYPE_BOOL } },
 202         { "path", BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_OPTIONAL, { .type = BT_VALUE_TYPE_STRING } },
 203         BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_END
 204 };
 205
 206 static
 207 bt_component_class_initialize_method_status handle_params(
 208                 struct dmesg_component *dmesg_comp,
 209                 const bt_value *params)
 210 {
 211         const bt_value *no_timestamp = NULL;
 212         const bt_value *path = NULL;
 213         bt_component_class_initialize_method_status status;
 214         enum bt_param_validation_status validation_status;
 215         gchar *validate_error = NULL;
 216
 217         validation_status = bt_param_validation_validate(params,
 218                 dmesg_params, &validate_error);
 219         if (validation_status == BT_PARAM_VALIDATION_STATUS_MEMORY_ERROR) {
 220                 status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
 221                 goto end;
 222         } else if (validation_status == BT_PARAM_VALIDATION_STATUS_VALIDATION_ERROR) {
 223                 status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
 224                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 225                         "%s", validate_error);
 226                 goto end;
 227         }
 228
 229         no_timestamp = bt_value_map_borrow_entry_value_const(params,
 230                 "no-extract-timestamp");
 231         if (no_timestamp) {
 232                 dmesg_comp->params.no_timestamp =
 233                         bt_value_bool_get(no_timestamp);
 234         }
 235
 236         path = bt_value_map_borrow_entry_value_const(params, "path");
 237         if (path) {
 238                 const char *path_str = bt_value_string_get(path);
 239
 240                 g_string_assign(dmesg_comp->params.path, path_str);
 241         } else {
 242                 dmesg_comp->params.read_from_stdin = true;
 243         }
 244
 245         status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK;
 246 end:
 247         g_free(validate_error);
 248
 249         return status;
 250 }
 251
 252 static
 253 int create_stream_and_trace(struct dmesg_component *dmesg_comp)
 254 {
 255         int ret = 0;
 256         const char *trace_name = NULL;
 257         gchar *basename = NULL;
 258
 259         dmesg_comp->trace = bt_trace_create(dmesg_comp->trace_class);
 260         if (!dmesg_comp->trace) {
 261                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 262                         "Cannot create trace object.");
 263                 goto error;
 264         }
 265
 266         if (dmesg_comp->params.read_from_stdin) {
 267                 trace_name = "STDIN";
 268         } else {
 269                 basename = g_path_get_basename(dmesg_comp->params.path->str);
 270                 BT_ASSERT(basename);
 271
 272                 if (strcmp(basename, G_DIR_SEPARATOR_S) != 0 &&
 273                                 strcmp(basename, ".") != 0) {
 274                         trace_name = basename;
 275                 }
 276         }
 277
 278         if (trace_name) {
 279                 ret = bt_trace_set_name(dmesg_comp->trace, trace_name);
 280                 if (ret) {
 281                         BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 282                                 "Cannot set trace's name: name=\"%s\"",
 283                                 trace_name);
 284                         goto error;
 285                 }
 286         }
 287
 288         dmesg_comp->stream = bt_stream_create(dmesg_comp->stream_class,
 289                 dmesg_comp->trace);
 290         if (!dmesg_comp->stream) {
 291                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 292                         "Cannot create stream object.");
 293                 goto error;
 294         }
 295
 296         goto end;
 297
 298 error:
 299         ret = -1;
 300
 301 end:
 302         g_free(basename);
 303
 304         return ret;
 305 }
 306
 307 static
 308 int try_create_meta_stream(struct dmesg_component *dmesg_comp, bool has_ts)
 309 {
 310         int ret = 0;
 311
 312         if (dmesg_comp->trace) {
 313                 /* Already created */
 314                 goto end;
 315         }
 316
 317         ret = create_meta(dmesg_comp, has_ts);
 318         if (ret) {
 319                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 320                         "Cannot create metadata objects: dmesg-comp-addr=%p",
 321                         dmesg_comp);
 322                 goto error;
 323         }
 324
 325         ret = create_stream_and_trace(dmesg_comp);
 326         if (ret) {
 327                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 328                         "Cannot create stream object: dmesg-comp-addr=%p",
 329                         dmesg_comp);
 330                 goto error;
 331         }
 332
 333         goto end;
 334
 335 error:
 336         ret = -1;
 337
 338 end:
 339         return ret;
 340 }
 341
 342 static
 343 void destroy_dmesg_component(struct dmesg_component *dmesg_comp)
 344 {
 345         if (!dmesg_comp) {
 346                 return;
 347         }
 348
 349         if (dmesg_comp->params.path) {
 350                 g_string_free(dmesg_comp->params.path, TRUE);
 351         }
 352
 353         bt_trace_put_ref(dmesg_comp->trace);
 354         bt_stream_class_put_ref(dmesg_comp->stream_class);
 355         bt_event_class_put_ref(dmesg_comp->event_class);
 356         bt_stream_put_ref(dmesg_comp->stream);
 357         bt_clock_class_put_ref(dmesg_comp->clock_class);
 358         bt_trace_class_put_ref(dmesg_comp->trace_class);
 359         g_free(dmesg_comp);
 360 }
 361
 362 bt_component_class_initialize_method_status dmesg_init(
 363                 bt_self_component_source *self_comp_src,
 364                 bt_self_component_source_configuration *config __attribute__((unused)),
 365                 const bt_value *params,
 366                 void *init_method_data __attribute__((unused)))
 367 {
 368         struct dmesg_component *dmesg_comp = g_new0(struct dmesg_component, 1);
 369         bt_component_class_initialize_method_status status;
 370         bt_self_component *self_comp =
 371                 bt_self_component_source_as_self_component(self_comp_src);
 372         const bt_component *comp = bt_self_component_as_component(self_comp);
 373         bt_logging_level log_level = bt_component_get_logging_level(comp);
 374         bt_self_component_add_port_status add_port_status;
 375
 376         if (!dmesg_comp) {
 377                 /*
 378                  * Don't use BT_COMP_LOGE_APPEND_CAUSE, as `dmesg_comp` is not
 379                  * initialized.
 380                  */
 381                 BT_COMP_LOG_CUR_LVL(BT_LOG_ERROR, log_level, self_comp,
 382                         "Failed to allocate one dmesg component structure.");
 383                 BT_CURRENT_THREAD_ERROR_APPEND_CAUSE_FROM_COMPONENT(self_comp,
 384                         "Failed to allocate one dmesg component structure.");
 385                 status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
 386                 goto error;
 387         }
 388
 389         dmesg_comp->log_level = log_level;
 390         dmesg_comp->self_comp = self_comp;
 391         dmesg_comp->self_comp_src = self_comp_src;
 392         dmesg_comp->params.path = g_string_new(NULL);
 393         if (!dmesg_comp->params.path) {
 394                 BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to allocate a GString.");
 395                 status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
 396                 goto error;
 397         }
 398
 399         status = handle_params(dmesg_comp, params);
 400         if (status != BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK) {
 401                 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
 402                         "Invalid parameters: comp-addr=%p", self_comp);
 403                 status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
 404                 goto error;
 405         }
 406
 407         if (!dmesg_comp->params.read_from_stdin &&
 408                         !g_file_test(dmesg_comp->params.path->str,
 409                         G_FILE_TEST_IS_REGULAR)) {
 410                 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
 411                         "Input path is not a regular file: "
 412                         "comp-addr=%p, path=\"%s\"", self_comp,
 413                         dmesg_comp->params.path->str);
 414                 status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
 415                 goto error;
 416         }
 417
 418         add_port_status = bt_self_component_source_add_output_port(
 419                 self_comp_src, "out", NULL, NULL);
 420         if (add_port_status != BT_SELF_COMPONENT_ADD_PORT_STATUS_OK) {
 421                 BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to add output port.");
 422                 status = (int) add_port_status;
 423                 goto error;
 424         }
 425
 426         bt_self_component_set_data(self_comp, dmesg_comp);
 427         BT_COMP_LOGI_STR("Component initialized.");
 428
 429         status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK;
 430         goto end;
 431
 432 error:
 433         destroy_dmesg_component(dmesg_comp);
 434         bt_self_component_set_data(self_comp, NULL);
 435
 436 end:
 437         return status;
 438 }
 439
 440 void dmesg_finalize(bt_self_component_source *self_comp)
 441 {
 442         destroy_dmesg_component(bt_self_component_get_data(
 443                 bt_self_component_source_as_self_component(self_comp)));
 444 }
 445
 446 static
 447 bt_message *create_init_event_msg_from_line(
 448                 struct dmesg_msg_iter *msg_iter,
 449                 const char *line, const char **new_start)
 450 {
 451         bt_event *event;
 452         bt_message *msg = NULL;
 453         bool has_timestamp = false;
 454         unsigned long sec, usec, msec;
 455         unsigned int year, mon, mday, hour, min;
 456         uint64_t ts = 0;
 457         int ret = 0;
 458         struct dmesg_component *dmesg_comp = msg_iter->dmesg_comp;
 459
 460         *new_start = line;
 461
 462         if (dmesg_comp->params.no_timestamp) {
 463                 goto skip_ts;
 464         }
 465
 466         /* Extract time from input line */
 467         if (sscanf(line, "[%lu.%lu] ", &sec, &usec) == 2) {
 468                 ts = (uint64_t) sec * USEC_PER_SEC + (uint64_t) usec;
 469
 470                 /*
 471                  * The clock class we use has a 1 GHz frequency: convert
 472                  * from µs to ns.
 473                  */
 474                 ts *= NSEC_PER_USEC;
 475                 has_timestamp = true;
 476         } else if (sscanf(line, "[%u-%u-%u %u:%u:%lu.%lu] ",
 477                         &year, &mon, &mday, &hour, &min,
 478                         &sec, &msec) == 7) {
 479                 time_t ep_sec;
 480                 struct tm ti;
 481
 482                 memset(&ti, 0, sizeof(ti));
 483                 ti.tm_year = year - 1900;       /* From 1900 */
 484                 ti.tm_mon = mon - 1;            /* 0 to 11 */
 485                 ti.tm_mday = mday;
 486                 ti.tm_hour = hour;
 487                 ti.tm_min = min;
 488                 ti.tm_sec = sec;
 489
 490                 ep_sec = bt_timegm(&ti);
 491                 if (ep_sec != (time_t) -1) {
 492                         ts = (uint64_t) ep_sec * NSEC_PER_SEC
 493                                 + (uint64_t) msec * NSEC_PER_MSEC;
 494                 }
 495
 496                 has_timestamp = true;
 497         }
 498
 499         if (has_timestamp) {
 500                 /* Set new start for the message portion of the line */
 501                 *new_start = strchr(line, ']');
 502                 BT_ASSERT_DBG(*new_start);
 503                 (*new_start)++;
 504
 505                 if ((*new_start)[0] == ' ') {
 506                         (*new_start)++;
 507                 }
 508         }
 509
 510 skip_ts:
 511         /*
 512          * At this point, we know if the stream class's event header
 513          * field class should have a timestamp or not, so we can lazily
 514          * create the metadata and stream objects.
 515          */
 516         ret = try_create_meta_stream(dmesg_comp, has_timestamp);
 517         if (ret) {
 518                 /* try_create_meta_stream() logs errors */
 519                 goto error;
 520         }
 521
 522         if (dmesg_comp->clock_class) {
 523                 msg = bt_message_event_create_with_default_clock_snapshot(
 524                         msg_iter->self_msg_iter,
 525                         dmesg_comp->event_class, dmesg_comp->stream, ts);
 526                 msg_iter->last_clock_value = ts;
 527         } else {
 528                 msg = bt_message_event_create(msg_iter->self_msg_iter,
 529                         dmesg_comp->event_class, dmesg_comp->stream);
 530         }
 531
 532         if (!msg) {
 533                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 534                         "Cannot create event message.");
 535                 goto error;
 536         }
 537
 538         event = bt_message_event_borrow_event(msg);
 539         BT_ASSERT_DBG(event);
 540         goto end;
 541
 542 error:
 543         BT_MESSAGE_PUT_REF_AND_RESET(msg);
 544
 545 end:
 546         return msg;
 547 }
 548
 549 static
 550 int fill_event_payload_from_line(struct dmesg_component *dmesg_comp,
 551                 const char *line, bt_event *event)
 552 {
 553         bt_field *ep_field = NULL;
 554         bt_field *str_field = NULL;
 555         size_t len;
 556         int ret;
 557
 558         ep_field = bt_event_borrow_payload_field(event);
 559         BT_ASSERT_DBG(ep_field);
 560         str_field = bt_field_structure_borrow_member_field_by_index(
 561                 ep_field, 0);
 562         if (!str_field) {
 563                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 564                         "Cannot borrow `timestamp` field from event payload structure field.");
 565                 goto error;
 566         }
 567
 568         len = strlen(line);
 569         if (line[len - 1] == '\n') {
 570                 /* Do not include the newline character in the payload */
 571                 len--;
 572         }
 573
 574         bt_field_string_clear(str_field);
 575         ret = bt_field_string_append_with_length(str_field, line, len);
 576         if (ret) {
 577                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 578                         "Cannot append value to string field object: len=%zu", len);
 579                 goto error;
 580         }
 581
 582         goto end;
 583
 584 error:
 585         ret = -1;
 586
 587 end:
 588         return ret;
 589 }
 590
 591 static
 592 bt_message *create_msg_from_line(
 593                 struct dmesg_msg_iter *dmesg_msg_iter, const char *line)
 594 {
 595         struct dmesg_component *dmesg_comp = dmesg_msg_iter->dmesg_comp;
 596         bt_event *event = NULL;
 597         bt_message *msg = NULL;
 598         const char *new_start;
 599         int ret;
 600
 601         msg = create_init_event_msg_from_line(dmesg_msg_iter,
 602                 line, &new_start);
 603         if (!msg) {
 604                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 605                         "Cannot create and initialize event message from line.");
 606                 goto error;
 607         }
 608
 609         event = bt_message_event_borrow_event(msg);
 610         BT_ASSERT_DBG(event);
 611         ret = fill_event_payload_from_line(dmesg_comp, new_start, event);
 612         if (ret) {
 613                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 614                         "Cannot fill event payload field from line: ret=%d", ret);
 615                 goto error;
 616         }
 617
 618         goto end;
 619
 620 error:
 621         BT_MESSAGE_PUT_REF_AND_RESET(msg);
 622
 623 end:
 624         return msg;
 625 }
 626
 627 static
 628 void destroy_dmesg_msg_iter(struct dmesg_msg_iter *dmesg_msg_iter)
 629 {
 630         struct dmesg_component *dmesg_comp;
 631
 632         if (!dmesg_msg_iter) {
 633                 return;
 634         }
 635
 636         dmesg_comp = dmesg_msg_iter->dmesg_comp;
 637
 638         if (dmesg_msg_iter->fp && dmesg_msg_iter->fp != stdin) {
 639                 if (fclose(dmesg_msg_iter->fp)) {
 640                         BT_COMP_LOGE_APPEND_CAUSE_ERRNO(dmesg_comp->self_comp,
 641                                 "Cannot close input file", ".");
 642                 }
 643         }
 644
 645         bt_message_put_ref(dmesg_msg_iter->tmp_event_msg);
 646         free(dmesg_msg_iter->linebuf);
 647         g_free(dmesg_msg_iter);
 648 }
 649
 650
 651
 652 bt_message_iterator_class_initialize_method_status dmesg_msg_iter_init(
 653                 bt_self_message_iterator *self_msg_iter,
 654                 bt_self_message_iterator_configuration *config __attribute__((unused)),
 655                 bt_self_component_port_output *self_port __attribute__((unused)))
 656 {
 657         bt_self_component *self_comp =
 658                 bt_self_message_iterator_borrow_component(self_msg_iter);
 659         struct dmesg_component *dmesg_comp = bt_self_component_get_data(self_comp);
 660         struct dmesg_msg_iter *dmesg_msg_iter =
 661                 g_new0(struct dmesg_msg_iter, 1);
 662         bt_message_iterator_class_initialize_method_status status;
 663
 664         if (!dmesg_msg_iter) {
 665                 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
 666                         "Failed to allocate on dmesg message iterator structure.");
 667                 status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
 668                 goto error;
 669         }
 670
 671         BT_ASSERT(dmesg_comp);
 672         dmesg_msg_iter->dmesg_comp = dmesg_comp;
 673         dmesg_msg_iter->self_msg_iter = self_msg_iter;
 674
 675         if (dmesg_comp->params.read_from_stdin) {
 676                 dmesg_msg_iter->fp = stdin;
 677         } else {
 678                 dmesg_msg_iter->fp = fopen(dmesg_comp->params.path->str, "r");
 679                 if (!dmesg_msg_iter->fp) {
 680                         BT_COMP_LOGE_APPEND_CAUSE_ERRNO(self_comp,
 681                                 "Cannot open input file in read mode", ": path=\"%s\"",
 682                                 dmesg_comp->params.path->str);
 683                         status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
 684                         goto error;
 685                 }
 686         }
 687
 688         bt_self_message_iterator_set_data(self_msg_iter,
 689                 dmesg_msg_iter);
 690
 691         status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_OK;
 692         goto end;
 693
 694 error:
 695         destroy_dmesg_msg_iter(dmesg_msg_iter);
 696         bt_self_message_iterator_set_data(self_msg_iter, NULL);
 697
 698 end:
 699         return status;
 700 }
 701
 702 void dmesg_msg_iter_finalize(
 703                 bt_self_message_iterator *priv_msg_iter)
 704 {
 705         destroy_dmesg_msg_iter(bt_self_message_iterator_get_data(
 706                 priv_msg_iter));
 707 }
 708
 709 static
 710 bt_message_iterator_class_next_method_status dmesg_msg_iter_next_one(
 711                 struct dmesg_msg_iter *dmesg_msg_iter,
 712                 bt_message **msg)
 713 {
 714         ssize_t len;
 715         struct dmesg_component *dmesg_comp;
 716         bt_message_iterator_class_next_method_status status;
 717
 718         BT_ASSERT_DBG(dmesg_msg_iter);
 719         dmesg_comp = dmesg_msg_iter->dmesg_comp;
 720         BT_ASSERT_DBG(dmesg_comp);
 721
 722         if (dmesg_msg_iter->state == STATE_DONE) {
 723                 status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_END;
 724                 goto end;
 725         }
 726
 727         if (dmesg_msg_iter->tmp_event_msg ||
 728                         dmesg_msg_iter->state == STATE_EMIT_STREAM_END) {
 729                 goto handle_state;
 730         }
 731
 732         while (true) {
 733                 const char *ch;
 734                 bool only_spaces = true;
 735
 736                 len = bt_getline(&dmesg_msg_iter->linebuf,
 737                         &dmesg_msg_iter->linebuf_len, dmesg_msg_iter->fp);
 738                 if (len < 0) {
 739                         if (errno == EINVAL) {
 740                                 status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
 741                                 goto end;
 742                         } else if (errno == ENOMEM) {
 743                                 status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_MEMORY_ERROR;
 744                                 goto end;
 745                         } else {
 746                                 if (dmesg_msg_iter->state == STATE_EMIT_STREAM_BEGINNING) {
 747                                         /* Stream did not even begin */
 748                                         status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_END;
 749                                         goto end;
 750                                 } else {
 751                                         /* End stream now */
 752                                         dmesg_msg_iter->state =
 753                                                 STATE_EMIT_STREAM_END;
 754                                         goto handle_state;
 755                                 }
 756                         }
 757                 }
 758
 759                 BT_ASSERT_DBG(dmesg_msg_iter->linebuf);
 760
 761                 /* Ignore empty lines, once trimmed */
 762                 for (ch = dmesg_msg_iter->linebuf; *ch != '\0'; ch++) {
 763                         if (!isspace((unsigned char) *ch)) {
 764                                 only_spaces = false;
 765                                 break;
 766                         }
 767                 }
 768
 769                 if (!only_spaces) {
 770                         break;
 771                 }
 772         }
 773
 774         dmesg_msg_iter->tmp_event_msg = create_msg_from_line(
 775                 dmesg_msg_iter, dmesg_msg_iter->linebuf);
 776         if (!dmesg_msg_iter->tmp_event_msg) {
 777                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 778                         "Cannot create event message from line: "
 779                         "dmesg-comp-addr=%p, line=\"%s\"", dmesg_comp,
 780                         dmesg_msg_iter->linebuf);
 781                 status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
 782                 goto end;
 783         }
 784
 785 handle_state:
 786         BT_ASSERT_DBG(dmesg_comp->trace);
 787
 788         switch (dmesg_msg_iter->state) {
 789         case STATE_EMIT_STREAM_BEGINNING:
 790                 BT_ASSERT_DBG(dmesg_msg_iter->tmp_event_msg);
 791                 *msg = bt_message_stream_beginning_create(
 792                         dmesg_msg_iter->self_msg_iter, dmesg_comp->stream);
 793                 dmesg_msg_iter->state = STATE_EMIT_EVENT;
 794                 break;
 795         case STATE_EMIT_EVENT:
 796                 BT_ASSERT_DBG(dmesg_msg_iter->tmp_event_msg);
 797                 *msg = dmesg_msg_iter->tmp_event_msg;
 798                 dmesg_msg_iter->tmp_event_msg = NULL;
 799                 break;
 800         case STATE_EMIT_STREAM_END:
 801                 *msg = bt_message_stream_end_create(
 802                         dmesg_msg_iter->self_msg_iter, dmesg_comp->stream);
 803                 dmesg_msg_iter->state = STATE_DONE;
 804                 break;
 805         default:
 806                 break;
 807         }
 808
 809         if (!*msg) {
 810                 BT_COMP_LOGE_APPEND_CAUSE(dmesg_comp->self_comp,
 811                         "Cannot create message: dmesg-comp-addr=%p",
 812                         dmesg_comp);
 813                 status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
 814                 goto end;
 815         }
 816
 817         status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
 818
 819 end:
 820         return status;
 821 }
 822
 823 bt_message_iterator_class_next_method_status dmesg_msg_iter_next(
 824                 bt_self_message_iterator *self_msg_iter,
 825                 bt_message_array_const msgs, uint64_t capacity,
 826                 uint64_t *count)
 827 {
 828         struct dmesg_msg_iter *dmesg_msg_iter =
 829                 bt_self_message_iterator_get_data(
 830                         self_msg_iter);
 831         bt_message_iterator_class_next_method_status status =
 832                 BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
 833         uint64_t i = 0;
 834
 835         while (i < capacity &&
 836                         status == BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
 837                 bt_message *priv_msg = NULL;
 838
 839                 status = dmesg_msg_iter_next_one(dmesg_msg_iter,
 840                         &priv_msg);
 841                 msgs[i] = priv_msg;
 842                 if (status == BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
 843                         i++;
 844                 }
 845         }
 846
 847         if (i > 0) {
 848                 /*
 849                  * Even if dmesg_msg_iter_next_one() returned
 850                  * something else than
 851                  * BT_SELF_MESSAGE_ITERATOR_STATUS_OK, we
 852                  * accumulated message objects in the output
 853                  * message array, so we need to return
 854                  * BT_SELF_MESSAGE_ITERATOR_STATUS_OK so that they
 855                  * are transfered to downstream. This other status
 856                  * occurs again the next time muxer_msg_iter_do_next()
 857                  * is called, possibly without any accumulated
 858                  * message, in which case we'll return it.
 859                  */
 860                 *count = i;
 861                 status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
 862         }
 863
 864         return status;
 865 }
 866
 867 bt_message_iterator_class_can_seek_beginning_method_status
 868 dmesg_msg_iter_can_seek_beginning(
 869                 bt_self_message_iterator *self_msg_iter, bt_bool *can_seek)
 870 {
 871         struct dmesg_msg_iter *dmesg_msg_iter =
 872                 bt_self_message_iterator_get_data(self_msg_iter);
 873
 874         /* Can't seek the beginning of the standard input stream */
 875         *can_seek = !dmesg_msg_iter->dmesg_comp->params.read_from_stdin;
 876
 877         return BT_MESSAGE_ITERATOR_CLASS_CAN_SEEK_BEGINNING_METHOD_STATUS_OK;
 878 }
 879
 880 bt_message_iterator_class_seek_beginning_method_status
 881 dmesg_msg_iter_seek_beginning(
 882                 bt_self_message_iterator *self_msg_iter)
 883 {
 884         struct dmesg_msg_iter *dmesg_msg_iter =
 885                 bt_self_message_iterator_get_data(self_msg_iter);
 886
 887         BT_ASSERT(!dmesg_msg_iter->dmesg_comp->params.read_from_stdin);
 888
 889         BT_MESSAGE_PUT_REF_AND_RESET(dmesg_msg_iter->tmp_event_msg);
 890         dmesg_msg_iter->last_clock_value = 0;
 891         dmesg_msg_iter->state = STATE_EMIT_STREAM_BEGINNING;
 892         return BT_MESSAGE_ITERATOR_CLASS_SEEK_BEGINNING_METHOD_STATUS_OK;
 893 }