tests/test-util-filemonitor.c

   1 /*
   2  * Tests for util/filemonitor-*.c
   3  *
   4  * Copyright 2018 Red Hat, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "qemu/main-loop.h"
  23 #include "qapi/error.h"
  24 #include "qemu/filemonitor.h"
  25
  26 #include <utime.h>
  27
  28 enum {
  29     QFILE_MONITOR_TEST_OP_CREATE,
  30     QFILE_MONITOR_TEST_OP_APPEND,
  31     QFILE_MONITOR_TEST_OP_TRUNC,
  32     QFILE_MONITOR_TEST_OP_RENAME,
  33     QFILE_MONITOR_TEST_OP_TOUCH,
  34     QFILE_MONITOR_TEST_OP_UNLINK,
  35 };
  36
  37 typedef struct {
  38     int type;
  39     const char *filesrc;
  40     const char *filedst;
  41 } QFileMonitorTestOp;
  42
  43 typedef struct {
  44     const char *file;
  45 } QFileMonitorTestWatch;
  46
  47 typedef struct {
  48     gsize nwatches;
  49     const QFileMonitorTestWatch *watches;
  50
  51     gsize nops;
  52     const QFileMonitorTestOp *ops;
  53 } QFileMonitorTestPlan;
  54
  55 typedef struct {
  56     int id;
  57     QFileMonitorEvent event;
  58     char *filename;
  59 } QFileMonitorTestRecord;
  60
  61
  62 typedef struct {
  63     QemuMutex lock;
  64     GList *records;
  65 } QFileMonitorTestData;
  66
  67 static QemuMutex evlock;
  68 static bool evstopping;
  69 static bool evrunning;
  70
  71 /*
  72  * Main function for a background thread that is
  73  * running the event loop during the test
  74  */
  75 static void *
  76 qemu_file_monitor_test_event_loop(void *opaque G_GNUC_UNUSED)
  77 {
  78     qemu_mutex_lock(&evlock);
  79
  80     while (!evstopping) {
  81         qemu_mutex_unlock(&evlock);
  82         main_loop_wait(true);
  83         qemu_mutex_lock(&evlock);
  84     }
  85
  86     evrunning = false;
  87     qemu_mutex_unlock(&evlock);
  88     return NULL;
  89 }
  90
  91
  92 /*
  93  * File monitor event handler which simply maintains
  94  * an ordered list of all events that it receives
  95  */
  96 static void
  97 qemu_file_monitor_test_handler(int id,
  98                                QFileMonitorEvent event,
  99                                const char *filename,
 100                                void *opaque)
 101 {
 102     QFileMonitorTestData *data = opaque;
 103     QFileMonitorTestRecord *rec = g_new0(QFileMonitorTestRecord, 1);
 104
 105     rec->id = id;
 106     rec->event = event;
 107     rec->filename = g_strdup(filename);
 108
 109     qemu_mutex_lock(&data->lock);
 110     data->records = g_list_append(data->records, rec);
 111     qemu_mutex_unlock(&data->lock);
 112 }
 113
 114
 115 static void
 116 qemu_file_monitor_test_record_free(QFileMonitorTestRecord *rec)
 117 {
 118     g_free(rec->filename);
 119     g_free(rec);
 120 }
 121
 122
 123 /*
 124  * Get the next event record that has been received by
 125  * the file monitor event handler. Since events are
 126  * emitted in the background thread running the event
 127  * loop, we can't assume there is a record available
 128  * immediately. Thus we will sleep for upto 5 seconds
 129  * to wait for the event to be queued for us.
 130  */
 131 static QFileMonitorTestRecord *
 132 qemu_file_monitor_test_next_record(QFileMonitorTestData *data)
 133 {
 134     GTimer *timer = g_timer_new();
 135     QFileMonitorTestRecord *record = NULL;
 136     GList *tmp;
 137
 138     qemu_mutex_lock(&data->lock);
 139     while (!data->records && g_timer_elapsed(timer, NULL) < 5) {
 140         qemu_mutex_unlock(&data->lock);
 141         usleep(10 * 1000);
 142         qemu_mutex_lock(&data->lock);
 143     }
 144     if (data->records) {
 145         record = data->records->data;
 146         tmp = data->records;
 147         data->records = g_list_remove_link(data->records, tmp);
 148         g_list_free(tmp);
 149     }
 150     qemu_mutex_unlock(&data->lock);
 151
 152     g_timer_destroy(timer);
 153     return record;
 154 }
 155
 156
 157 /*
 158  * Check whether the event record we retrieved matches
 159  * data we were expecting to see for the event
 160  */
 161 static bool
 162 qemu_file_monitor_test_expect(QFileMonitorTestData *data,
 163                               int id,
 164                               QFileMonitorEvent event,
 165                               const char *filename)
 166 {
 167     QFileMonitorTestRecord *rec;
 168     bool ret = false;
 169
 170     rec = qemu_file_monitor_test_next_record(data);
 171
 172     if (!rec) {
 173         g_printerr("Missing event watch id %d event %d file %s\n",
 174                    id, event, filename);
 175         return false;
 176     }
 177
 178     if (id != rec->id) {
 179         g_printerr("Expected watch id %d but got %d\n", id, rec->id);
 180         goto cleanup;
 181     }
 182
 183     if (event != rec->event) {
 184         g_printerr("Expected event %d but got %d\n", event, rec->event);
 185         goto cleanup;
 186     }
 187
 188     if (!g_str_equal(filename, rec->filename)) {
 189         g_printerr("Expected filename %s but got %s\n",
 190                    filename, rec->filename);
 191         goto cleanup;
 192     }
 193
 194     ret = true;
 195
 196  cleanup:
 197     qemu_file_monitor_test_record_free(rec);
 198     return ret;
 199 }
 200
 201
 202 static void
 203 test_file_monitor_events(const void *opaque)
 204 {
 205     const QFileMonitorTestPlan *plan = opaque;
 206     Error *local_err = NULL;
 207     GError *gerr = NULL;
 208     QFileMonitor *mon = qemu_file_monitor_new(&local_err);
 209     QemuThread th;
 210     GTimer *timer;
 211     gchar *dir = NULL;
 212     int err = -1;
 213     gsize i, j;
 214     char *pathsrc = NULL;
 215     char *pathdst = NULL;
 216     QFileMonitorTestData data;
 217
 218     qemu_mutex_init(&data.lock);
 219     data.records = NULL;
 220
 221     /*
 222      * The file monitor needs the main loop running in
 223      * order to receive events from inotify. We must
 224      * thus spawn a background thread to run an event
 225      * loop impl, while this thread triggers the
 226      * actual file operations we're testing
 227      */
 228     evrunning = 1;
 229     evstopping = 0;
 230     qemu_thread_create(&th, "event-loop",
 231                        qemu_file_monitor_test_event_loop, NULL,
 232                        QEMU_THREAD_JOINABLE);
 233
 234     if (local_err) {
 235         g_printerr("File monitoring not available: %s",
 236                    error_get_pretty(local_err));
 237         error_free(local_err);
 238         return;
 239     }
 240
 241     dir = g_dir_make_tmp("test-util-filemonitor-XXXXXX",
 242                          &gerr);
 243     if (!dir) {
 244         g_printerr("Unable to create tmp dir %s",
 245                    gerr->message);
 246         g_error_free(gerr);
 247         abort();
 248     }
 249
 250     /*
 251      * First register all the directory / file watches
 252      * we're interested in seeing events against
 253      */
 254     for (i = 0; i < plan->nwatches; i++) {
 255         int watchid;
 256         watchid = qemu_file_monitor_add_watch(mon,
 257                                               dir,
 258                                               plan->watches[i].file,
 259                                               qemu_file_monitor_test_handler,
 260                                               &data,
 261                                               &local_err);
 262         if (watchid < 0) {
 263             g_printerr("Unable to add watch %s",
 264                        error_get_pretty(local_err));
 265             goto cleanup;
 266         }
 267     }
 268
 269
 270     /*
 271      * Now invoke all the file operations (create,
 272      * delete, rename, chmod, etc). These operations
 273      * will trigger the various file monitor events
 274      */
 275     for (i = 0; i < plan->nops; i++) {
 276         const QFileMonitorTestOp *op = &(plan->ops[i]);
 277         int fd;
 278         struct utimbuf ubuf;
 279
 280         pathsrc = g_strdup_printf("%s/%s", dir, op->filesrc);
 281         if (op->filedst) {
 282             pathdst = g_strdup_printf("%s/%s", dir, op->filedst);
 283         }
 284
 285         switch (op->type) {
 286         case QFILE_MONITOR_TEST_OP_CREATE:
 287             fd = open(pathsrc, O_WRONLY | O_CREAT, 0700);
 288             if (fd < 0) {
 289                 g_printerr("Unable to create %s: %s",
 290                            pathsrc, strerror(errno));
 291                 goto cleanup;
 292             }
 293             close(fd);
 294             break;
 295
 296         case QFILE_MONITOR_TEST_OP_APPEND:
 297             fd = open(pathsrc, O_WRONLY | O_APPEND, 0700);
 298             if (fd < 0) {
 299                 g_printerr("Unable to open %s: %s",
 300                            pathsrc, strerror(errno));
 301                 goto cleanup;
 302             }
 303
 304             if (write(fd, "Hello World", 10) != 10) {
 305                 g_printerr("Unable to write %s: %s",
 306                            pathsrc, strerror(errno));
 307                 close(fd);
 308                 goto cleanup;
 309             }
 310             close(fd);
 311             break;
 312
 313         case QFILE_MONITOR_TEST_OP_TRUNC:
 314             if (truncate(pathsrc, 4) < 0) {
 315                 g_printerr("Unable to truncate %s: %s",
 316                            pathsrc, strerror(errno));
 317                 goto cleanup;
 318             }
 319             break;
 320
 321         case QFILE_MONITOR_TEST_OP_RENAME:
 322             if (rename(pathsrc, pathdst) < 0) {
 323                 g_printerr("Unable to rename %s to %s: %s",
 324                            pathsrc, pathdst, strerror(errno));
 325                 goto cleanup;
 326             }
 327             break;
 328
 329         case QFILE_MONITOR_TEST_OP_UNLINK:
 330             if (unlink(pathsrc) < 0) {
 331                 g_printerr("Unable to unlink %s: %s",
 332                            pathsrc, strerror(errno));
 333                 goto cleanup;
 334             }
 335             break;
 336
 337         case QFILE_MONITOR_TEST_OP_TOUCH:
 338             ubuf.actime = 1024;
 339             ubuf.modtime = 1025;
 340             if (utime(pathsrc, &ubuf) < 0) {
 341                 g_printerr("Unable to touch %s: %s",
 342                            pathsrc, strerror(errno));
 343                 goto cleanup;
 344             }
 345             break;
 346
 347         default:
 348             g_assert_not_reached();
 349         }
 350
 351         g_free(pathsrc);
 352         g_free(pathdst);
 353         pathsrc = pathdst = NULL;
 354     }
 355
 356
 357     /*
 358      * Finally validate that we have received all the events
 359      * we expect to see for the combination of watches and
 360      * file operations
 361      */
 362     for (i = 0; i < plan->nops; i++) {
 363         const QFileMonitorTestOp *op = &(plan->ops[i]);
 364
 365         switch (op->type) {
 366         case QFILE_MONITOR_TEST_OP_CREATE:
 367             for (j = 0; j < plan->nwatches; j++) {
 368                 if (plan->watches[j].file &&
 369                     !g_str_equal(plan->watches[j].file, op->filesrc))
 370                     continue;
 371
 372                 if (!qemu_file_monitor_test_expect(
 373                         &data, j, QFILE_MONITOR_EVENT_CREATED, op->filesrc))
 374                     goto cleanup;
 375             }
 376             break;
 377
 378         case QFILE_MONITOR_TEST_OP_APPEND:
 379         case QFILE_MONITOR_TEST_OP_TRUNC:
 380             for (j = 0; j < plan->nwatches; j++) {
 381                 if (plan->watches[j].file &&
 382                     !g_str_equal(plan->watches[j].file, op->filesrc))
 383                     continue;
 384
 385                 if (!qemu_file_monitor_test_expect(
 386                         &data, j, QFILE_MONITOR_EVENT_MODIFIED, op->filesrc))
 387                     goto cleanup;
 388             }
 389             break;
 390
 391         case QFILE_MONITOR_TEST_OP_RENAME:
 392             for (j = 0; j < plan->nwatches; j++) {
 393                 if (plan->watches[j].file &&
 394                     !g_str_equal(plan->watches[j].file, op->filesrc))
 395                     continue;
 396
 397                 if (!qemu_file_monitor_test_expect(
 398                         &data, j, QFILE_MONITOR_EVENT_DELETED, op->filesrc))
 399                     goto cleanup;
 400             }
 401
 402             for (j = 0; j < plan->nwatches; j++) {
 403                 if (plan->watches[j].file &&
 404                     !g_str_equal(plan->watches[j].file, op->filedst))
 405                     continue;
 406
 407                 if (!qemu_file_monitor_test_expect(
 408                         &data, j, QFILE_MONITOR_EVENT_CREATED, op->filedst))
 409                     goto cleanup;
 410             }
 411             break;
 412
 413         case QFILE_MONITOR_TEST_OP_TOUCH:
 414             for (j = 0; j < plan->nwatches; j++) {
 415                 if (plan->watches[j].file &&
 416                     !g_str_equal(plan->watches[j].file, op->filesrc))
 417                     continue;
 418
 419                 if (!qemu_file_monitor_test_expect(
 420                         &data, j, QFILE_MONITOR_EVENT_ATTRIBUTES, op->filesrc))
 421                     goto cleanup;
 422             }
 423             break;
 424
 425         case QFILE_MONITOR_TEST_OP_UNLINK:
 426             for (j = 0; j < plan->nwatches; j++) {
 427                 if (plan->watches[j].file &&
 428                     !g_str_equal(plan->watches[j].file, op->filesrc))
 429                     continue;
 430
 431                 if (!qemu_file_monitor_test_expect(
 432                         &data, j, QFILE_MONITOR_EVENT_DELETED, op->filesrc))
 433                     goto cleanup;
 434             }
 435             break;
 436
 437         default:
 438             g_assert_not_reached();
 439         }
 440     }
 441
 442     err = 0;
 443
 444  cleanup:
 445     g_free(pathsrc);
 446     g_free(pathdst);
 447
 448     qemu_mutex_lock(&evlock);
 449     evstopping = 1;
 450     timer = g_timer_new();
 451     while (evrunning && g_timer_elapsed(timer, NULL) < 5) {
 452         qemu_mutex_unlock(&evlock);
 453         usleep(10 * 1000);
 454         qemu_mutex_lock(&evlock);
 455     }
 456     qemu_mutex_unlock(&evlock);
 457
 458     if (g_timer_elapsed(timer, NULL) >= 5) {
 459         g_printerr("Event loop failed to quit after 5 seconds\n");
 460     }
 461     g_timer_destroy(timer);
 462
 463     for (i = 0; i < plan->nops; i++) {
 464         const QFileMonitorTestOp *op = &(plan->ops[i]);
 465         pathsrc = g_strdup_printf("%s/%s", dir, op->filesrc);
 466         unlink(pathsrc);
 467         g_free(pathsrc);
 468         if (op->filedst) {
 469             pathdst = g_strdup_printf("%s/%s", dir, op->filedst);
 470             unlink(pathdst);
 471             g_free(pathdst);
 472         }
 473     }
 474
 475     qemu_file_monitor_free(mon);
 476     g_list_foreach(data.records,
 477                    (GFunc)qemu_file_monitor_test_record_free, NULL);
 478     g_list_free(data.records);
 479     qemu_mutex_destroy(&data.lock);
 480     if (dir) {
 481         rmdir(dir);
 482     }
 483     g_free(dir);
 484     g_assert(err == 0);
 485 }
 486
 487
 488 /*
 489  * Set of structs which define which file name patterns
 490  * we're trying to watch against. NULL, means all files
 491  * in the directory
 492  */
 493 static const QFileMonitorTestWatch watches_any[] = {
 494     { NULL },
 495 };
 496
 497 static const QFileMonitorTestWatch watches_one[] = {
 498     { "one.txt" },
 499 };
 500
 501 static const QFileMonitorTestWatch watches_two[] = {
 502     { "two.txt" },
 503 };
 504
 505 static const QFileMonitorTestWatch watches_many[] = {
 506     { NULL },
 507     { "one.txt" },
 508     { "two.txt" },
 509 };
 510
 511
 512 /*
 513  * Various sets of file operations we're going to
 514  * trigger and validate events for
 515  */
 516 static const QFileMonitorTestOp ops_create_one[] = {
 517     { .type = QFILE_MONITOR_TEST_OP_CREATE,
 518       .filesrc = "one.txt", }
 519 };
 520
 521 static const QFileMonitorTestOp ops_delete_one[] = {
 522     { .type = QFILE_MONITOR_TEST_OP_CREATE,
 523       .filesrc = "one.txt", },
 524     { .type = QFILE_MONITOR_TEST_OP_UNLINK,
 525       .filesrc = "one.txt", }
 526 };
 527
 528 static const QFileMonitorTestOp ops_create_many[] = {
 529     { .type = QFILE_MONITOR_TEST_OP_CREATE,
 530       .filesrc = "one.txt", },
 531     { .type = QFILE_MONITOR_TEST_OP_CREATE,
 532       .filesrc = "two.txt", },
 533     { .type = QFILE_MONITOR_TEST_OP_CREATE,
 534       .filesrc = "three.txt", }
 535 };
 536
 537 static const QFileMonitorTestOp ops_rename_one[] = {
 538     { .type = QFILE_MONITOR_TEST_OP_CREATE,
 539       .filesrc = "one.txt", },
 540     { .type = QFILE_MONITOR_TEST_OP_RENAME,
 541       .filesrc = "one.txt", .filedst = "two.txt" }
 542 };
 543
 544 static const QFileMonitorTestOp ops_rename_many[] = {
 545     { .type = QFILE_MONITOR_TEST_OP_CREATE,
 546       .filesrc = "one.txt", },
 547     { .type = QFILE_MONITOR_TEST_OP_CREATE,
 548       .filesrc = "two.txt", },
 549     { .type = QFILE_MONITOR_TEST_OP_RENAME,
 550       .filesrc = "one.txt", .filedst = "two.txt" }
 551 };
 552
 553 static const QFileMonitorTestOp ops_append_one[] = {
 554     { .type = QFILE_MONITOR_TEST_OP_CREATE,
 555       .filesrc = "one.txt", },
 556     { .type = QFILE_MONITOR_TEST_OP_APPEND,
 557       .filesrc = "one.txt", },
 558 };
 559
 560 static const QFileMonitorTestOp ops_trunc_one[] = {
 561     { .type = QFILE_MONITOR_TEST_OP_CREATE,
 562       .filesrc = "one.txt", },
 563     { .type = QFILE_MONITOR_TEST_OP_TRUNC,
 564       .filesrc = "one.txt", },
 565 };
 566
 567 static const QFileMonitorTestOp ops_touch_one[] = {
 568     { .type = QFILE_MONITOR_TEST_OP_CREATE,
 569       .filesrc = "one.txt", },
 570     { .type = QFILE_MONITOR_TEST_OP_TOUCH,
 571       .filesrc = "one.txt", },
 572 };
 573
 574
 575 /*
 576  * No we define data sets for the combinatorial
 577  * expansion of file watches and operation sets
 578  */
 579 #define PLAN_DATA(o, w) \
 580     static const QFileMonitorTestPlan plan_ ## o ## _ ## w = { \
 581         .nops = G_N_ELEMENTS(ops_ ##o), \
 582         .ops = ops_ ##o, \
 583         .nwatches = G_N_ELEMENTS(watches_ ##w), \
 584         .watches = watches_ ## w, \
 585     }
 586
 587 PLAN_DATA(create_one, any);
 588 PLAN_DATA(create_one, one);
 589 PLAN_DATA(create_one, two);
 590 PLAN_DATA(create_one, many);
 591
 592 PLAN_DATA(delete_one, any);
 593 PLAN_DATA(delete_one, one);
 594 PLAN_DATA(delete_one, two);
 595 PLAN_DATA(delete_one, many);
 596
 597 PLAN_DATA(create_many, any);
 598 PLAN_DATA(create_many, one);
 599 PLAN_DATA(create_many, two);
 600 PLAN_DATA(create_many, many);
 601
 602 PLAN_DATA(rename_one, any);
 603 PLAN_DATA(rename_one, one);
 604 PLAN_DATA(rename_one, two);
 605 PLAN_DATA(rename_one, many);
 606
 607 PLAN_DATA(rename_many, any);
 608 PLAN_DATA(rename_many, one);
 609 PLAN_DATA(rename_many, two);
 610 PLAN_DATA(rename_many, many);
 611
 612 PLAN_DATA(append_one, any);
 613 PLAN_DATA(append_one, one);
 614 PLAN_DATA(append_one, two);
 615 PLAN_DATA(append_one, many);
 616
 617 PLAN_DATA(trunc_one, any);
 618 PLAN_DATA(trunc_one, one);
 619 PLAN_DATA(trunc_one, two);
 620 PLAN_DATA(trunc_one, many);
 621
 622 PLAN_DATA(touch_one, any);
 623 PLAN_DATA(touch_one, one);
 624 PLAN_DATA(touch_one, two);
 625 PLAN_DATA(touch_one, many);
 626
 627
 628 int main(int argc, char **argv)
 629 {
 630     g_test_init(&argc, &argv, NULL);
 631
 632     qemu_init_main_loop(&error_abort);
 633
 634     qemu_mutex_init(&evlock);
 635
 636     /*
 637      * Register test cases for the combinatorial
 638      * expansion of file watches and operation sets
 639      */
 640     #define PLAN_REGISTER(o, w)                                         \
 641         g_test_add_data_func("/util/filemonitor/" # o "/" # w,          \
 642                              &plan_ ## o ## _ ## w, test_file_monitor_events)
 643
 644     PLAN_REGISTER(create_one, any);
 645     PLAN_REGISTER(create_one, one);
 646     PLAN_REGISTER(create_one, two);
 647     PLAN_REGISTER(create_one, many);
 648
 649     PLAN_REGISTER(delete_one, any);
 650     PLAN_REGISTER(delete_one, one);
 651     PLAN_REGISTER(delete_one, two);
 652     PLAN_REGISTER(delete_one, many);
 653
 654     PLAN_REGISTER(create_many, any);
 655     PLAN_REGISTER(create_many, one);
 656     PLAN_REGISTER(create_many, two);
 657     PLAN_REGISTER(create_many, many);
 658
 659     PLAN_REGISTER(rename_one, any);
 660     PLAN_REGISTER(rename_one, one);
 661     PLAN_REGISTER(rename_one, two);
 662     PLAN_REGISTER(rename_one, many);
 663
 664     PLAN_REGISTER(rename_many, any);
 665     PLAN_REGISTER(rename_many, one);
 666     PLAN_REGISTER(rename_many, two);
 667     PLAN_REGISTER(rename_many, many);
 668
 669     PLAN_REGISTER(append_one, any);
 670     PLAN_REGISTER(append_one, one);
 671     PLAN_REGISTER(append_one, two);
 672     PLAN_REGISTER(append_one, many);
 673
 674     PLAN_REGISTER(trunc_one, any);
 675     PLAN_REGISTER(trunc_one, one);
 676     PLAN_REGISTER(trunc_one, two);
 677     PLAN_REGISTER(trunc_one, many);
 678
 679     PLAN_REGISTER(touch_one, any);
 680     PLAN_REGISTER(touch_one, one);
 681     PLAN_REGISTER(touch_one, two);
 682     PLAN_REGISTER(touch_one, many);
 683
 684     return g_test_run();
 685 }