tests/reconnect.at

   1 AT_BANNER([reconnect library])
   2
   3 m4_define([__RECONNECT_CHECK],
   4   [AT_SETUP([$1])
   5    $2
   6    AT_KEYWORDS([reconnect])
   7    AT_DATA([input], [$3])
   8    AT_CHECK([$4], [0], [$5])
   9    AT_CLEANUP])
  10
  11 m4_define([RECONNECT_CHECK],
  12   [__RECONNECT_CHECK(
  13      [$1 - C],
  14      [],
  15      [$2],
  16      [ovstest test-reconnect < input],
  17      [$3])
  18    __RECONNECT_CHECK(
  19      [$1 - Python2],
  20      [AT_SKIP_IF([test $HAVE_PYTHON = no])],
  21      [$2],
  22      [$PYTHON $srcdir/test-reconnect.py < input],
  23      [$3])
  24    __RECONNECT_CHECK(
  25      [$1 - Python3],
  26      [AT_SKIP_IF([test $HAVE_PYTHON3 = no])],
  27      [$2],
  28      [$PYTHON3 $srcdir/test-reconnect.py < input],
  29      [$3])])
  30
  31 ######################################################################
  32 RECONNECT_CHECK([nothing happens if not enabled],
  33   [run
  34 timeout
  35 ],
  36   [### t=1000 ###
  37 run
  38 timeout
  39   no timeout
  40 ])
  41
  42 ######################################################################
  43 RECONNECT_CHECK([quick connect, idle disconnect],
  44   [enable
  45
  46 # Connection succeeds.
  47 run
  48 connected
  49
  50 # Send inactivity probe.
  51 timeout
  52 run
  53
  54 # Idle timeout kills connection.
  55 timeout
  56 run
  57 disconnected
  58 ],
  59   [### t=1000 ###
  60 enable
  61   in BACKOFF for 0 ms (0 ms backoff)
  62
  63 # Connection succeeds.
  64 run
  65   should connect
  66 connected
  67   in ACTIVE for 0 ms (0 ms backoff)
  68   created 1000, last activity 1000, last connected 1000
  69   1 successful connections out of 1 attempts, seqno 1
  70   connected
  71   last connected 0 ms ago, connected 0 ms total
  72
  73 # Send inactivity probe.
  74 timeout
  75   advance 5000 ms
  76
  77 ### t=6000 ###
  78   in ACTIVE for 5000 ms (0 ms backoff)
  79 run
  80   should send probe
  81   in IDLE for 0 ms (0 ms backoff)
  82
  83 # Idle timeout kills connection.
  84 timeout
  85   advance 5000 ms
  86
  87 ### t=11000 ###
  88   in IDLE for 5000 ms (0 ms backoff)
  89 run
  90   should disconnect
  91 disconnected
  92   in BACKOFF for 0 ms (1000 ms backoff)
  93   1 successful connections out of 1 attempts, seqno 2
  94   disconnected
  95   disconnected at 11000 ms (0 ms ago)
  96 ])
  97
  98 ######################################################################
  99 RECONNECT_CHECK([slow connect, idle disconnect],
 100   [enable
 101
 102 # Start connecting.
 103 run
 104 connecting
 105
 106 # Connect after 500 ms.
 107 advance 500
 108 run
 109 connected
 110
 111 # Send inactivity probe.
 112 timeout
 113 run
 114
 115 # Idle timeout kills connection.
 116 timeout
 117 run
 118 disconnected
 119 ],
 120   [### t=1000 ###
 121 enable
 122   in BACKOFF for 0 ms (0 ms backoff)
 123
 124 # Start connecting.
 125 run
 126   should connect
 127 connecting
 128   in CONNECTING for 0 ms (0 ms backoff)
 129
 130 # Connect after 500 ms.
 131 advance 500
 132
 133 ### t=1500 ###
 134   in CONNECTING for 500 ms (0 ms backoff)
 135 run
 136 connected
 137   in ACTIVE for 0 ms (0 ms backoff)
 138   created 1000, last activity 1000, last connected 1500
 139   1 successful connections out of 1 attempts, seqno 1
 140   connected
 141   last connected 0 ms ago, connected 0 ms total
 142
 143 # Send inactivity probe.
 144 timeout
 145   advance 5000 ms
 146
 147 ### t=6500 ###
 148   in ACTIVE for 5000 ms (0 ms backoff)
 149 run
 150   should send probe
 151   in IDLE for 0 ms (0 ms backoff)
 152
 153 # Idle timeout kills connection.
 154 timeout
 155   advance 5000 ms
 156
 157 ### t=11500 ###
 158   in IDLE for 5000 ms (0 ms backoff)
 159 run
 160   should disconnect
 161 disconnected
 162   in BACKOFF for 0 ms (1000 ms backoff)
 163   1 successful connections out of 1 attempts, seqno 2
 164   disconnected
 165   disconnected at 11500 ms (0 ms ago)
 166 ])
 167
 168 ######################################################################
 169 RECONNECT_CHECK([connect backs off],
 170   [enable
 171
 172 # First connection attempt fails after 1000 ms.
 173 run
 174 connecting
 175 run
 176 timeout
 177 run
 178 connect-failed
 179
 180 # Back off for 1000 ms.
 181 timeout
 182 run
 183
 184 # Second connection attempt fails after 1000 ms.
 185 connecting
 186 timeout
 187 run
 188 connect-failed
 189
 190 # Back off for 2000 ms.
 191 timeout
 192 run
 193
 194 # Third connection attempt fails after 2000 ms.
 195 connecting
 196 timeout
 197 run
 198 connect-failed
 199
 200 # Back off for 4000 ms.
 201 timeout
 202 run
 203
 204 # Third connection attempt fails after 4000 ms.
 205 connecting
 206 timeout
 207 run
 208 connect-failed
 209
 210 # Back off for 8000 ms.
 211 timeout
 212 run
 213
 214 # Third connection attempt fails after 8000 ms.
 215 connecting
 216 timeout
 217 run
 218 connect-failed
 219
 220 # Back off for 8000 ms.
 221 timeout
 222 run
 223
 224 # Fourth connection attempt fails after 8000 ms.
 225 connecting
 226 timeout
 227 run
 228 connect-failed
 229 ],
 230   [### t=1000 ###
 231 enable
 232   in BACKOFF for 0 ms (0 ms backoff)
 233
 234 # First connection attempt fails after 1000 ms.
 235 run
 236   should connect
 237 connecting
 238   in CONNECTING for 0 ms (0 ms backoff)
 239 run
 240 timeout
 241   advance 1000 ms
 242
 243 ### t=2000 ###
 244   in CONNECTING for 1000 ms (0 ms backoff)
 245 run
 246   should disconnect
 247 connect-failed
 248   in BACKOFF for 0 ms (1000 ms backoff)
 249   0 successful connections out of 1 attempts, seqno 0
 250
 251 # Back off for 1000 ms.
 252 timeout
 253   advance 1000 ms
 254
 255 ### t=3000 ###
 256   in BACKOFF for 1000 ms (1000 ms backoff)
 257 run
 258   should connect
 259
 260 # Second connection attempt fails after 1000 ms.
 261 connecting
 262   in CONNECTING for 0 ms (1000 ms backoff)
 263 timeout
 264   advance 1000 ms
 265
 266 ### t=4000 ###
 267   in CONNECTING for 1000 ms (1000 ms backoff)
 268 run
 269   should disconnect
 270 connect-failed
 271   in BACKOFF for 0 ms (2000 ms backoff)
 272   0 successful connections out of 2 attempts, seqno 0
 273
 274 # Back off for 2000 ms.
 275 timeout
 276   advance 2000 ms
 277
 278 ### t=6000 ###
 279   in BACKOFF for 2000 ms (2000 ms backoff)
 280 run
 281   should connect
 282
 283 # Third connection attempt fails after 2000 ms.
 284 connecting
 285   in CONNECTING for 0 ms (2000 ms backoff)
 286 timeout
 287   advance 2000 ms
 288
 289 ### t=8000 ###
 290   in CONNECTING for 2000 ms (2000 ms backoff)
 291 run
 292   should disconnect
 293 connect-failed
 294   in BACKOFF for 0 ms (4000 ms backoff)
 295   0 successful connections out of 3 attempts, seqno 0
 296
 297 # Back off for 4000 ms.
 298 timeout
 299   advance 4000 ms
 300
 301 ### t=12000 ###
 302   in BACKOFF for 4000 ms (4000 ms backoff)
 303 run
 304   should connect
 305
 306 # Third connection attempt fails after 4000 ms.
 307 connecting
 308   in CONNECTING for 0 ms (4000 ms backoff)
 309 timeout
 310   advance 4000 ms
 311
 312 ### t=16000 ###
 313   in CONNECTING for 4000 ms (4000 ms backoff)
 314 run
 315   should disconnect
 316 connect-failed
 317   in BACKOFF for 0 ms (8000 ms backoff)
 318   0 successful connections out of 4 attempts, seqno 0
 319
 320 # Back off for 8000 ms.
 321 timeout
 322   advance 8000 ms
 323
 324 ### t=24000 ###
 325   in BACKOFF for 8000 ms (8000 ms backoff)
 326 run
 327   should connect
 328
 329 # Third connection attempt fails after 8000 ms.
 330 connecting
 331   in CONNECTING for 0 ms (8000 ms backoff)
 332 timeout
 333   advance 8000 ms
 334
 335 ### t=32000 ###
 336   in CONNECTING for 8000 ms (8000 ms backoff)
 337 run
 338   should disconnect
 339 connect-failed
 340   in BACKOFF for 0 ms (8000 ms backoff)
 341   0 successful connections out of 5 attempts, seqno 0
 342
 343 # Back off for 8000 ms.
 344 timeout
 345   advance 8000 ms
 346
 347 ### t=40000 ###
 348   in BACKOFF for 8000 ms (8000 ms backoff)
 349 run
 350   should connect
 351
 352 # Fourth connection attempt fails after 8000 ms.
 353 connecting
 354   in CONNECTING for 0 ms (8000 ms backoff)
 355 timeout
 356   advance 8000 ms
 357
 358 ### t=48000 ###
 359   in CONNECTING for 8000 ms (8000 ms backoff)
 360 run
 361   should disconnect
 362 connect-failed
 363   in BACKOFF for 0 ms (8000 ms backoff)
 364   0 successful connections out of 6 attempts, seqno 0
 365 ])
 366
 367 ######################################################################
 368 RECONNECT_CHECK([connections with no data preserve backoff],
 369   [enable
 370
 371 # First connect, then idle timeout kills connection.
 372 run
 373 connected
 374 timeout
 375 run
 376 timeout
 377 run
 378 disconnected
 379
 380 # Back off for 1000 ms.
 381 timeout
 382 run
 383
 384 # Second connect, then idle timeout kills connection.
 385 run
 386 connected
 387 timeout
 388 run
 389 timeout
 390 run
 391 disconnected
 392
 393 # Back off for 2000 ms.
 394 timeout
 395 run
 396
 397 # Third connect, then idle timeout kills connection.
 398 run
 399 connected
 400 timeout
 401 run
 402 timeout
 403 run
 404 disconnected
 405
 406 # Back off for 4000 ms.
 407 timeout
 408 ], [### t=1000 ###
 409 enable
 410   in BACKOFF for 0 ms (0 ms backoff)
 411
 412 # First connect, then idle timeout kills connection.
 413 run
 414   should connect
 415 connected
 416   in ACTIVE for 0 ms (0 ms backoff)
 417   created 1000, last activity 1000, last connected 1000
 418   1 successful connections out of 1 attempts, seqno 1
 419   connected
 420   last connected 0 ms ago, connected 0 ms total
 421 timeout
 422   advance 5000 ms
 423
 424 ### t=6000 ###
 425   in ACTIVE for 5000 ms (0 ms backoff)
 426 run
 427   should send probe
 428   in IDLE for 0 ms (0 ms backoff)
 429 timeout
 430   advance 5000 ms
 431
 432 ### t=11000 ###
 433   in IDLE for 5000 ms (0 ms backoff)
 434 run
 435   should disconnect
 436 disconnected
 437   in BACKOFF for 0 ms (1000 ms backoff)
 438   1 successful connections out of 1 attempts, seqno 2
 439   disconnected
 440   disconnected at 11000 ms (0 ms ago)
 441
 442 # Back off for 1000 ms.
 443 timeout
 444   advance 1000 ms
 445
 446 ### t=12000 ###
 447   in BACKOFF for 1000 ms (1000 ms backoff)
 448   last connected 11000 ms ago, connected 10000 ms total
 449 run
 450   should connect
 451
 452 # Second connect, then idle timeout kills connection.
 453 run
 454   should connect
 455 connected
 456   in ACTIVE for 0 ms (1000 ms backoff)
 457   created 1000, last activity 1000, last connected 12000
 458   2 successful connections out of 2 attempts, seqno 3
 459   connected
 460   last connected 0 ms ago, connected 10000 ms total
 461 timeout
 462   advance 5000 ms
 463
 464 ### t=17000 ###
 465   in ACTIVE for 5000 ms (1000 ms backoff)
 466 run
 467   should send probe
 468   in IDLE for 0 ms (1000 ms backoff)
 469 timeout
 470   advance 5000 ms
 471
 472 ### t=22000 ###
 473   in IDLE for 5000 ms (1000 ms backoff)
 474 run
 475   should disconnect
 476 disconnected
 477   in BACKOFF for 0 ms (2000 ms backoff)
 478   2 successful connections out of 2 attempts, seqno 4
 479   disconnected
 480   disconnected at 22000 ms (0 ms ago)
 481
 482 # Back off for 2000 ms.
 483 timeout
 484   advance 2000 ms
 485
 486 ### t=24000 ###
 487   in BACKOFF for 2000 ms (2000 ms backoff)
 488   last connected 12000 ms ago, connected 20000 ms total
 489 run
 490   should connect
 491
 492 # Third connect, then idle timeout kills connection.
 493 run
 494   should connect
 495 connected
 496   in ACTIVE for 0 ms (2000 ms backoff)
 497   created 1000, last activity 1000, last connected 24000
 498   3 successful connections out of 3 attempts, seqno 5
 499   connected
 500   last connected 0 ms ago, connected 20000 ms total
 501 timeout
 502   advance 5000 ms
 503
 504 ### t=29000 ###
 505   in ACTIVE for 5000 ms (2000 ms backoff)
 506 run
 507   should send probe
 508   in IDLE for 0 ms (2000 ms backoff)
 509 timeout
 510   advance 5000 ms
 511
 512 ### t=34000 ###
 513   in IDLE for 5000 ms (2000 ms backoff)
 514 run
 515   should disconnect
 516 disconnected
 517   in BACKOFF for 0 ms (4000 ms backoff)
 518   3 successful connections out of 3 attempts, seqno 6
 519   disconnected
 520   disconnected at 34000 ms (0 ms ago)
 521
 522 # Back off for 4000 ms.
 523 timeout
 524   advance 4000 ms
 525
 526 ### t=38000 ###
 527   in BACKOFF for 4000 ms (4000 ms backoff)
 528   last connected 14000 ms ago, connected 30000 ms total
 529 ])
 530
 531 ######################################################################
 532 RECONNECT_CHECK([brief connection preserves backoff],
 533   [enable
 534
 535 # First connection attempt fails after 1000 ms.
 536 run
 537 connecting
 538 run
 539 timeout
 540 run
 541 connect-failed
 542
 543 # Back off for 1000 ms.
 544 timeout
 545 run
 546
 547 # Second connection attempt fails after 1000 ms.
 548 connecting
 549 timeout
 550 run
 551 connect-failed
 552
 553 # Back off for 2000 ms.
 554 timeout
 555 run
 556
 557 # Third connection attempt succeeds after 500 ms.
 558 connecting
 559 advance 500
 560 run
 561 connected
 562
 563 # Connection drops after another 250 ms.
 564 advance 250
 565 disconnected
 566 run
 567
 568 # Back off for 4000 ms.
 569 timeout
 570 run
 571 ], [### t=1000 ###
 572 enable
 573   in BACKOFF for 0 ms (0 ms backoff)
 574
 575 # First connection attempt fails after 1000 ms.
 576 run
 577   should connect
 578 connecting
 579   in CONNECTING for 0 ms (0 ms backoff)
 580 run
 581 timeout
 582   advance 1000 ms
 583
 584 ### t=2000 ###
 585   in CONNECTING for 1000 ms (0 ms backoff)
 586 run
 587   should disconnect
 588 connect-failed
 589   in BACKOFF for 0 ms (1000 ms backoff)
 590   0 successful connections out of 1 attempts, seqno 0
 591
 592 # Back off for 1000 ms.
 593 timeout
 594   advance 1000 ms
 595
 596 ### t=3000 ###
 597   in BACKOFF for 1000 ms (1000 ms backoff)
 598 run
 599   should connect
 600
 601 # Second connection attempt fails after 1000 ms.
 602 connecting
 603   in CONNECTING for 0 ms (1000 ms backoff)
 604 timeout
 605   advance 1000 ms
 606
 607 ### t=4000 ###
 608   in CONNECTING for 1000 ms (1000 ms backoff)
 609 run
 610   should disconnect
 611 connect-failed
 612   in BACKOFF for 0 ms (2000 ms backoff)
 613   0 successful connections out of 2 attempts, seqno 0
 614
 615 # Back off for 2000 ms.
 616 timeout
 617   advance 2000 ms
 618
 619 ### t=6000 ###
 620   in BACKOFF for 2000 ms (2000 ms backoff)
 621 run
 622   should connect
 623
 624 # Third connection attempt succeeds after 500 ms.
 625 connecting
 626   in CONNECTING for 0 ms (2000 ms backoff)
 627 advance 500
 628
 629 ### t=6500 ###
 630   in CONNECTING for 500 ms (2000 ms backoff)
 631 run
 632 connected
 633   in ACTIVE for 0 ms (2000 ms backoff)
 634   created 1000, last activity 1000, last connected 6500
 635   1 successful connections out of 3 attempts, seqno 1
 636   connected
 637   last connected 0 ms ago, connected 0 ms total
 638
 639 # Connection drops after another 250 ms.
 640 advance 250
 641
 642 ### t=6750 ###
 643   in ACTIVE for 250 ms (2000 ms backoff)
 644 disconnected
 645   in BACKOFF for 0 ms (4000 ms backoff)
 646   1 successful connections out of 3 attempts, seqno 2
 647   disconnected
 648   disconnected at 6750 ms (0 ms ago)
 649 run
 650
 651 # Back off for 4000 ms.
 652 timeout
 653   advance 4000 ms
 654
 655 ### t=10750 ###
 656   in BACKOFF for 4000 ms (4000 ms backoff)
 657   last connected 4250 ms ago, connected 250 ms total
 658 run
 659   should connect
 660 ])
 661
 662 ######################################################################
 663 RECONNECT_CHECK([brief connection with data preserves backoff],
 664   [enable
 665
 666 # First connection attempt fails after 1000 ms.
 667 run
 668 connecting
 669 run
 670 timeout
 671 run
 672 connect-failed
 673
 674 # Back off for 1000 ms.
 675 timeout
 676 run
 677
 678 # Second connection attempt fails after 1000 ms.
 679 connecting
 680 timeout
 681 run
 682 connect-failed
 683
 684 # Back off for 2000 ms.
 685 timeout
 686 run
 687
 688 # Third connection attempt succeeds after 500 ms.
 689 connecting
 690 advance 500
 691 run
 692 connected
 693
 694 # Connection receives 3 chunks of data spaced 250 ms apart.
 695 advance 250
 696 run
 697 activity
 698 advance 250
 699 run
 700 activity
 701 advance 250
 702 run
 703 activity
 704
 705 # Connection drops.
 706 disconnected
 707 run
 708
 709 # Back off for 4000 ms.
 710 timeout
 711 run
 712 ],
 713   [### t=1000 ###
 714 enable
 715   in BACKOFF for 0 ms (0 ms backoff)
 716
 717 # First connection attempt fails after 1000 ms.
 718 run
 719   should connect
 720 connecting
 721   in CONNECTING for 0 ms (0 ms backoff)
 722 run
 723 timeout
 724   advance 1000 ms
 725
 726 ### t=2000 ###
 727   in CONNECTING for 1000 ms (0 ms backoff)
 728 run
 729   should disconnect
 730 connect-failed
 731   in BACKOFF for 0 ms (1000 ms backoff)
 732   0 successful connections out of 1 attempts, seqno 0
 733
 734 # Back off for 1000 ms.
 735 timeout
 736   advance 1000 ms
 737
 738 ### t=3000 ###
 739   in BACKOFF for 1000 ms (1000 ms backoff)
 740 run
 741   should connect
 742
 743 # Second connection attempt fails after 1000 ms.
 744 connecting
 745   in CONNECTING for 0 ms (1000 ms backoff)
 746 timeout
 747   advance 1000 ms
 748
 749 ### t=4000 ###
 750   in CONNECTING for 1000 ms (1000 ms backoff)
 751 run
 752   should disconnect
 753 connect-failed
 754   in BACKOFF for 0 ms (2000 ms backoff)
 755   0 successful connections out of 2 attempts, seqno 0
 756
 757 # Back off for 2000 ms.
 758 timeout
 759   advance 2000 ms
 760
 761 ### t=6000 ###
 762   in BACKOFF for 2000 ms (2000 ms backoff)
 763 run
 764   should connect
 765
 766 # Third connection attempt succeeds after 500 ms.
 767 connecting
 768   in CONNECTING for 0 ms (2000 ms backoff)
 769 advance 500
 770
 771 ### t=6500 ###
 772   in CONNECTING for 500 ms (2000 ms backoff)
 773 run
 774 connected
 775   in ACTIVE for 0 ms (2000 ms backoff)
 776   created 1000, last activity 1000, last connected 6500
 777   1 successful connections out of 3 attempts, seqno 1
 778   connected
 779   last connected 0 ms ago, connected 0 ms total
 780
 781 # Connection receives 3 chunks of data spaced 250 ms apart.
 782 advance 250
 783
 784 ### t=6750 ###
 785   in ACTIVE for 250 ms (2000 ms backoff)
 786 run
 787 activity
 788   created 1000, last activity 6750, last connected 6500
 789 advance 250
 790
 791 ### t=7000 ###
 792   in ACTIVE for 500 ms (2000 ms backoff)
 793 run
 794 activity
 795   created 1000, last activity 7000, last connected 6500
 796 advance 250
 797
 798 ### t=7250 ###
 799   in ACTIVE for 750 ms (2000 ms backoff)
 800 run
 801 activity
 802   created 1000, last activity 7250, last connected 6500
 803
 804 # Connection drops.
 805 disconnected
 806   in BACKOFF for 0 ms (4000 ms backoff)
 807   1 successful connections out of 3 attempts, seqno 2
 808   disconnected
 809   disconnected at 7250 ms (0 ms ago)
 810 run
 811
 812 # Back off for 4000 ms.
 813 timeout
 814   advance 4000 ms
 815
 816 ### t=11250 ###
 817   in BACKOFF for 4000 ms (4000 ms backoff)
 818   last connected 4750 ms ago, connected 750 ms total
 819 run
 820   should connect
 821 ])
 822
 823 ######################################################################
 824 RECONNECT_CHECK([long connection resets backoff],
 825   [enable
 826
 827 # First connection attempt fails after 1000 ms.
 828 run
 829 connecting
 830 run
 831 timeout
 832 run
 833 connect-failed
 834
 835 # Back off for 1000 ms.
 836 timeout
 837 run
 838
 839 # Second connection attempt fails after 1000 ms.
 840 connecting
 841 timeout
 842 run
 843 connect-failed
 844
 845 # Back off for 2000 ms.
 846 timeout
 847 run
 848
 849 # Third connection attempt succeeds after 500 ms.
 850 connecting
 851 advance 500
 852 run
 853 connected
 854
 855 # Connection receives 3 chunks of data spaced 2000 ms apart.
 856 advance 2000
 857 run
 858 activity
 859 advance 2000
 860 run
 861 activity
 862 advance 2000
 863 run
 864 activity
 865
 866 # Connection drops.
 867 disconnected
 868 run
 869
 870 # Back off for 1000 ms.
 871 timeout
 872 run
 873 ],
 874   [### t=1000 ###
 875 enable
 876   in BACKOFF for 0 ms (0 ms backoff)
 877
 878 # First connection attempt fails after 1000 ms.
 879 run
 880   should connect
 881 connecting
 882   in CONNECTING for 0 ms (0 ms backoff)
 883 run
 884 timeout
 885   advance 1000 ms
 886
 887 ### t=2000 ###
 888   in CONNECTING for 1000 ms (0 ms backoff)
 889 run
 890   should disconnect
 891 connect-failed
 892   in BACKOFF for 0 ms (1000 ms backoff)
 893   0 successful connections out of 1 attempts, seqno 0
 894
 895 # Back off for 1000 ms.
 896 timeout
 897   advance 1000 ms
 898
 899 ### t=3000 ###
 900   in BACKOFF for 1000 ms (1000 ms backoff)
 901 run
 902   should connect
 903
 904 # Second connection attempt fails after 1000 ms.
 905 connecting
 906   in CONNECTING for 0 ms (1000 ms backoff)
 907 timeout
 908   advance 1000 ms
 909
 910 ### t=4000 ###
 911   in CONNECTING for 1000 ms (1000 ms backoff)
 912 run
 913   should disconnect
 914 connect-failed
 915   in BACKOFF for 0 ms (2000 ms backoff)
 916   0 successful connections out of 2 attempts, seqno 0
 917
 918 # Back off for 2000 ms.
 919 timeout
 920   advance 2000 ms
 921
 922 ### t=6000 ###
 923   in BACKOFF for 2000 ms (2000 ms backoff)
 924 run
 925   should connect
 926
 927 # Third connection attempt succeeds after 500 ms.
 928 connecting
 929   in CONNECTING for 0 ms (2000 ms backoff)
 930 advance 500
 931
 932 ### t=6500 ###
 933   in CONNECTING for 500 ms (2000 ms backoff)
 934 run
 935 connected
 936   in ACTIVE for 0 ms (2000 ms backoff)
 937   created 1000, last activity 1000, last connected 6500
 938   1 successful connections out of 3 attempts, seqno 1
 939   connected
 940   last connected 0 ms ago, connected 0 ms total
 941
 942 # Connection receives 3 chunks of data spaced 2000 ms apart.
 943 advance 2000
 944
 945 ### t=8500 ###
 946   in ACTIVE for 2000 ms (2000 ms backoff)
 947 run
 948 activity
 949   created 1000, last activity 8500, last connected 6500
 950 advance 2000
 951
 952 ### t=10500 ###
 953   in ACTIVE for 4000 ms (2000 ms backoff)
 954 run
 955 activity
 956   created 1000, last activity 10500, last connected 6500
 957 advance 2000
 958
 959 ### t=12500 ###
 960   in ACTIVE for 6000 ms (2000 ms backoff)
 961 run
 962 activity
 963   created 1000, last activity 12500, last connected 6500
 964
 965 # Connection drops.
 966 disconnected
 967   in BACKOFF for 0 ms (1000 ms backoff)
 968   1 successful connections out of 3 attempts, seqno 2
 969   disconnected
 970   disconnected at 12500 ms (0 ms ago)
 971 run
 972
 973 # Back off for 1000 ms.
 974 timeout
 975   advance 1000 ms
 976
 977 ### t=13500 ###
 978   in BACKOFF for 1000 ms (1000 ms backoff)
 979   last connected 7000 ms ago, connected 6000 ms total
 980 run
 981   should connect
 982 ])
 983
 984 ######################################################################
 985 RECONNECT_CHECK([connection attempt fails quickly],
 986   [enable
 987
 988 # Connection fails quickly.
 989 run
 990 connect-failed ECONNREFUSED
 991
 992 # Back off for 1000 ms.
 993 run
 994 timeout
 995
 996 # Connection fails quickly again.
 997 run
 998 connect-failed ECONNREFUSED
 999
1000 # Back off for 2000 ms.
1001 run
1002 timeout
1003 ],
1004    [### t=1000 ###
1005 enable
1006   in BACKOFF for 0 ms (0 ms backoff)
1007
1008 # Connection fails quickly.
1009 run
1010   should connect
1011 connect-failed ECONNREFUSED
1012   in BACKOFF for 0 ms (1000 ms backoff)
1013   0 successful connections out of 1 attempts, seqno 0
1014
1015 # Back off for 1000 ms.
1016 run
1017 timeout
1018   advance 1000 ms
1019
1020 ### t=2000 ###
1021   in BACKOFF for 1000 ms (1000 ms backoff)
1022
1023 # Connection fails quickly again.
1024 run
1025   should connect
1026 connect-failed ECONNREFUSED
1027   in BACKOFF for 0 ms (2000 ms backoff)
1028   0 successful connections out of 2 attempts, seqno 0
1029
1030 # Back off for 2000 ms.
1031 run
1032 timeout
1033   advance 2000 ms
1034
1035 ### t=4000 ###
1036   in BACKOFF for 2000 ms (2000 ms backoff)
1037 ])
1038
1039 ######################################################################
1040 RECONNECT_CHECK([backoff-free tries work],
1041   [set-backoff-free-tries 2
1042 enable
1043
1044 # Connection fails quickly.
1045 run
1046 connect-failed ECONNREFUSED
1047
1048 # No backoff.
1049 run
1050 timeout
1051
1052 # Connection fails quickly again.
1053 run
1054 connect-failed ECONNREFUSED
1055
1056 # Back off for 1000 ms.
1057 run
1058 timeout
1059 ],
1060    [### t=1000 ###
1061 set-backoff-free-tries 2
1062 enable
1063   in BACKOFF for 0 ms (0 ms backoff)
1064
1065 # Connection fails quickly.
1066 run
1067   should connect
1068 connect-failed ECONNREFUSED
1069   0 successful connections out of 1 attempts, seqno 0
1070
1071 # No backoff.
1072 run
1073   should connect
1074 timeout
1075   advance 0 ms
1076
1077 # Connection fails quickly again.
1078 run
1079   should connect
1080 connect-failed ECONNREFUSED
1081   in BACKOFF for 0 ms (1000 ms backoff)
1082   0 successful connections out of 2 attempts, seqno 0
1083
1084 # Back off for 1000 ms.
1085 run
1086 timeout
1087   advance 1000 ms
1088
1089 ### t=2000 ###
1090   in BACKOFF for 1000 ms (1000 ms backoff)
1091 ])
1092
1093 ######################################################################
1094 RECONNECT_CHECK([max-tries of 1 honored],
1095   [set-max-tries 1
1096 enable
1097
1098 # Connection succeeds.
1099 run
1100 connected
1101
1102 # Send inactivity probe.
1103 timeout
1104 run
1105
1106 # Idle timeout kills connection.
1107 timeout
1108 run
1109 disconnected
1110 ],
1111   [### t=1000 ###
1112 set-max-tries 1
1113   1 tries left
1114 enable
1115   in BACKOFF for 0 ms (0 ms backoff)
1116   0 tries left
1117
1118 # Connection succeeds.
1119 run
1120   should connect
1121 connected
1122   in ACTIVE for 0 ms (0 ms backoff)
1123   created 1000, last activity 1000, last connected 1000
1124   1 successful connections out of 1 attempts, seqno 1
1125   connected
1126   last connected 0 ms ago, connected 0 ms total
1127
1128 # Send inactivity probe.
1129 timeout
1130   advance 5000 ms
1131
1132 ### t=6000 ###
1133   in ACTIVE for 5000 ms (0 ms backoff)
1134 run
1135   should send probe
1136   in IDLE for 0 ms (0 ms backoff)
1137
1138 # Idle timeout kills connection.
1139 timeout
1140   advance 5000 ms
1141
1142 ### t=11000 ###
1143   in IDLE for 5000 ms (0 ms backoff)
1144 run
1145   should disconnect
1146 disconnected
1147   in VOID for 0 ms (0 ms backoff)
1148   1 successful connections out of 1 attempts, seqno 2
1149   disconnected
1150   disconnected at 11000 ms (0 ms ago)
1151 ])
1152
1153 ######################################################################
1154 RECONNECT_CHECK([max-tries of 0 honored],
1155   [set-max-tries 0
1156 enable
1157 run
1158 timeout
1159 ],
1160   [### t=1000 ###
1161 set-max-tries 0
1162   0 tries left
1163 enable
1164 run
1165 timeout
1166   no timeout
1167 ])
1168
1169 ######################################################################
1170 RECONNECT_CHECK([passive mode],
1171   [passive
1172 enable
1173
1174 # Start listening.
1175 timeout
1176 run
1177 listening
1178
1179 # Listening never times out.
1180 timeout
1181 run
1182
1183 # Listening failed (accept() returned funny error?).  Back off and try again.
1184 listen-error 0
1185 timeout
1186 run
1187 listening
1188
1189 # Connection accepted.
1190 connected
1191 activity
1192 advance 1000
1193 activity
1194
1195 # Connection times out.
1196 timeout
1197 run
1198 timeout
1199 run
1200 disconnected
1201
1202 # Start listening again.
1203 timeout
1204 run
1205 listening
1206 ],
1207   [### t=1000 ###
1208 passive
1209 enable
1210   in BACKOFF for 0 ms (0 ms backoff)
1211
1212 # Start listening.
1213 timeout
1214   advance 0 ms
1215 run
1216   should connect
1217 listening
1218   in LISTENING for 0 ms (0 ms backoff)
1219
1220 # Listening never times out.
1221 timeout
1222   no timeout
1223 run
1224
1225 # Listening failed (accept() returned funny error?).  Back off and try again.
1226 listen-error 0
1227   in BACKOFF for 0 ms (1000 ms backoff)
1228 timeout
1229   advance 1000 ms
1230
1231 ### t=2000 ###
1232   in BACKOFF for 1000 ms (1000 ms backoff)
1233 run
1234   should connect
1235 listening
1236   in LISTENING for 0 ms (1000 ms backoff)
1237
1238 # Connection accepted.
1239 connected
1240   in ACTIVE for 0 ms (1000 ms backoff)
1241   created 1000, last activity 1000, last connected 2000
1242   1 successful connections out of 1 attempts, seqno 1
1243   connected
1244   last connected 0 ms ago, connected 0 ms total
1245 activity
1246   created 1000, last activity 2000, last connected 2000
1247 advance 1000
1248
1249 ### t=3000 ###
1250   in ACTIVE for 1000 ms (1000 ms backoff)
1251 activity
1252   created 1000, last activity 3000, last connected 2000
1253
1254 # Connection times out.
1255 timeout
1256   advance 5000 ms
1257
1258 ### t=8000 ###
1259   in ACTIVE for 6000 ms (1000 ms backoff)
1260 run
1261   should send probe
1262   in IDLE for 0 ms (1000 ms backoff)
1263 timeout
1264   advance 5000 ms
1265
1266 ### t=13000 ###
1267   in IDLE for 5000 ms (1000 ms backoff)
1268 run
1269   should disconnect
1270 disconnected
1271   in BACKOFF for 0 ms (0 ms backoff)
1272   1 successful connections out of 1 attempts, seqno 2
1273   disconnected
1274   disconnected at 13000 ms (0 ms ago)
1275
1276 # Start listening again.
1277 timeout
1278   advance 0 ms
1279 run
1280   should connect
1281 listening
1282   in LISTENING for 0 ms (0 ms backoff)
1283 ])