Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 | 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 3179x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 88810x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 32x 32x 32x 113900x 61x 61x 113921x 113921x 113921x 113900x 113900x 113900x 113900x 113900x 113900x 113900x 113913x 86710x 86710x 86710x 86710x 86710x 86710x 86710x 86710x 86710x 86710x 86710x 86710x 113894x 113894x 113894x 113894x 2134x 2116x 2116x 113894x 113921x 61x 61x 61x 61x 24077x 61x 61x 61x 2x 61x 61x 61x 61x 61x 61x 61x 638435x 61x 61x 61x 61x 276x 61x 61x 638711x 638711x 638711x 638711x 638711x 638711x 633273x 73637x 73637x 73553x 8x 8x 8x 73553x 73545x 73545x 73545x 73553x 633273x 461422x 556657x 5852x 5852x 98205x 6x 6x 6x 633273x 638711x 638711x 6x 638711x 92678x 92678x 635686x 545902x 263x 263x 263x 263x 261x 261x 545902x 5x 545639x 33x 545631x 545601x 545601x 11112x 11112x 11112x 7x 7x 545601x 534489x 534489x 545601x 546027x 115x 115x 115x 638658x 638658x 638658x 638658x 638703x 638711x 638711x 61x 545855x 545855x 545855x 136422x 136422x 136422x 206x 136332x 136216x 136216x 136422x 136422x 136422x 545855x 409433x 409433x 409433x 409433x 409175x 409175x 409433x 409433x 409433x 409433x 545839x 545855x 61x 61x 5189x 5189x 61x 61x 61x 61x 2570x 2570x 2570x 2570x 2570x 2570x 2570x 2570x 2570x 36x 36x 2570x 2570x 2570x 2570x 2570x 61x 61x 61x 61x 9x 9x 1x 9x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 9x 61x 61x 61x 1020707x 1020707x 1020707x 226915x 1020689x 742576x 215271x 215271x 215271x 62653x 62653x 2106x 527452x 1020707x 1020707x 61x 61x 61x 672706x 672706x 672706x 672706x 203721x 671722x 2x 2x 672706x 672706x 672706x 672706x 672706x 672706x 672705x 672705x 672706x 672705x 672705x 672705x 672705x 672706x 672706x 349924x 349924x 349924x 672706x 5945x 5945x 5945x 5871x 5871x 5945x 5945x 666760x 666760x 666760x 666760x 672706x 105600x 105600x 105600x 105600x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 561160x 672706x 559308x 559308x 559308x 561160x 561160x 561160x 561160x 672706x 672706x 102241x 102241x 661237x 457991x 457991x 457991x 457991x 457991x 457991x 457991x 457991x 457991x 457991x 457991x 2x 2x 457990x 457990x 457990x 457990x 457990x 457991x 457991x 561159x 561159x 561159x 672467x 460607x 460607x 561159x 623502x 461356x 461356x 672661x 99803x 99803x 2812x 99803x 96991x 96991x 99803x 561159x 571212x 198004x 198004x 198004x 198004x 198004x 198004x 198004x 198004x 198004x 561159x 672706x 99803x 99803x 99803x 561158x 561158x 61x 61x 92680x 92680x 92680x 92670x 2481x 2481x 6x 6x 6x 2481x 55337x 55337x 87999x 32104x 32104x 32104x 32104x 92680x 23233x 23233x 23233x 23233x 23233x 23233x 23233x 92680x 61x 61x 61x 61x 354869x 354869x 354869x 354869x 354869x 65842x 65842x 65842x 65842x 354869x 61x 88017x 88017x 88017x 88017x 81684x 81684x 81684x 88014x 88014x 88014x 88014x 88014x 88014x 88014x 88014x 88014x 88017x 88017x 88017x 88017x 61x 61x 61x 61x 61x 61x 61x 61x 548076x 548076x 65141x 65141x 65141x 548076x 61x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 65129x 335753x 65129x 328428x 328428x 328428x 328428x 328428x 328428x 328428x 65128x 65129x 61x 61x 61x 61x 61x 61x 1x 61x 61x 61x 3837x 3837x 3837x 3837x 20x 19x 19x 19x 19x 19x 20x 3837x 3837x 3837x 3837x 3837x 3837x 3837x 3837x 3837x 3837x 3837x 3836x 3836x 3837x 3837x 3837x 91037x 91037x 3690x 3688x 3688x 3688x 3690x 91037x 3837x 3837x 651x 651x 651x 3837x 3837x 3837x 3837x 3837x 3688x 3688x 3688x 3688x 3688x 96x 96x 3688x 3688x 3688x 3688x 3688x 3688x 3688x 3688x 3688x 3688x 3688x 3688x 3688x 3688x 3688x 3688x 3688x 3837x 3837x 16048x 16048x 16048x 16048x 16048x 16045x 10218x 10218x 10218x 16045x 5827x 5827x 5827x 16045x 16045x 16048x 115x 115x 115x 115x 115x 115x 115x 16048x 3837x 3837x 3837x 180707x 180707x 180707x 180707x 16046x 16046x 180707x 3837x 3837x 3837x 3837x 43x 43x 43x 43x 6x 6x 4x 4x 6x 2x 2x 6x 43x 3837x 3837x 3837x 3837x 3837x 3837x 19x 19x 19x 3837x 3837x 594x 594x 594x 594x 3837x 3837x 3837x 3631x 3631x 3631x 3837x 3837x 3837x 3837x 3837x 3837x 3837x 2x 2x 2x 3837x 31x 31x 31x 3837x 3837x 61x 61x 115x 115x 16031x 16031x 16031x 16031x 16031x 16031x 10205x 10205x 16031x 5825x 5825x 5825x 16031x 16031x 16031x 13088x 13088x 115x 115x 61x 61x 61x 3683x 3683x 3683x 3683x 3683x 3683x 3679x 3683x 20x 20x 20x 20x 20x 20x 20x 20x 20x 3659x 3659x 3659x 3659x 3682x 3658x 3658x 3658x 3660x 3658x 3658x 3658x 3658x 61x 61x 61x 61x 61x 483501x 483501x 483501x 483501x 27155x 27155x 27155x 27155x 27155x 27155x 27155x 483422x 745x 661x 661x 661x 661x 661x 111x 639x 476x 476x 661x 745x 483501x 483501x 61x 61x 61x 61x 105364x 105364x 105364x 105364x 56x 56x 56x 56x 56x 56x 56x 56x 105364x 105364x 61x 61x 61x 61x 36466x 36466x 36466x 36466x 2x 2x 2x 2x 2x 2x 2x 2x 36466x 36466x 61x 61x 58x 58x 58x 58x 58x 4x 4x 4x 4x 4x 57x 8x 53x 22x 22x 58x 61x 476x 476x 476x 476x 61x 61x 61x 61x 76019x 76019x 67711x 67711x 67711x 67711x 67711x 67711x 67711x 76019x 76019x 61x 61x 67711x 67711x 67661x 67661x 67661x 67711x 61x 67651x 67651x 67651x 54644x 54644x 67651x 67651x 67651x 67651x 67651x 67651x 67651x 61x 61x 32304x 32304x 29217x 29217x 29217x 29217x 32304x 32304x 61x 61x 155660x 155660x 155660x 155660x 155660x 61x 61x 61x 61x 61x 12x 12x 12x 12x 12x 12x 12x 45x 40x 40x 40x 12x 12x 12x 7x 12x 12x 12x 3x 12x 12x 12x 2x 12x 12x 12x 1x 12x 12x 12x 39x 36x 36x 36x 12x 12x 12x 12x 12x 33x 33x 2x 2x 33x 12x 12x 61x 61x 61x 555x 61x 61x 61x 7x 7x 7x 6x 61x 61x 561x 561x 3x 3x 561x 561x 561x 561x 561x 61x 561x 561x 561x 561x 3360x 2015x 2015x 3169x 1345x 1345x 3360x 561x 561x 561x 561x 561x 551x 551x 551x 561x 561x 561x 561x 3910x 3910x 2119x 3908x 48x 1789x 398x 1685x 1345x 1341x 3910x 561x 48x 48x 557x 548x 548x 543x 548x 541x 548x 7x 7x 7x 548x 561x 61x 61x 61x 61x 61x 61x 61x 61x 121709x 121709x 121709x 121709x 121709x 121709x 121709x 61x 61x 11000x 11000x 11000x 11000x 11000x 61x 61x 61x 61x 61x 61x 20x 20x 61x 61x 61x 61x 61x 61x 18x 18x 18x 5x 18x 18x 61x 61x 61x 61x 61x 61x 16545x 16545x 61x 61x 61x 61x 61x 61x 2x 2x 61x 61x 61x 61x 61x 61x 3061x 61x 61x 108x 108x 108x 108x 61x 61x 61x 61x 61x 61x 14133x 14133x 61x 61x 61x 61x 61x 61x 3090x 3090x 61x 61x 61x 61x 61x 61x 1287x 1287x 61x 61x 61x 61x 61x 61x 2x 2x 61x 61x 61x 61x 61x 1954x 1954x 61x 61x 61x 61x 61x 61x 20369x 61x 61x 3x 3x 3x 1x 1x 2x 2x 2x 2x 3x 61x 61x 61x 61x 61x 61x 23677x 23677x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 100560x 100560x 100560x 100560x 99811x 99811x 99811x 100557x 94966x 28107x 28107x 28107x 27705x 27705x 440x 440x 28107x 94966x 66859x 66859x 66859x 99811x 99811x 100560x 61x 104593x 104593x 104593x 104593x 104593x 104487x 104487x 104487x 104593x 61x 104453x 104453x 104453x 104453x 104453x 104453x 51116x 51116x 51116x 51116x 3282x 50715x 24153x 24153x 24153x 24153x 3684x 3684x 3684x 3684x 24153x 24153x 24153x 22303x 22303x 24153x 51116x 104453x 61x 3282x 3282x 3282x 3282x 3280x 3280x 3282x 61x 61x 383x 61x 61x 61x 61x 61x 2x 2x 2x 2x 2x 61x 61x 61x 61x 61x 2x 2x 2x 61x 61x 61x 3x 3x 3x 3x 3x 3x 3x 3x 61x | // Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';
const {
ArrayPrototypeIndexOf,
NumberIsInteger,
NumberIsNaN,
NumberParseInt,
ObjectDefineProperties,
ObjectKeys,
ObjectSetPrototypeOf,
Promise,
SafeSet,
SymbolAsyncIterator,
Symbol
} = primordials;
module.exports = Readable;
Readable.ReadableState = ReadableState;
const EE = require('events');
const { Stream, prependListener } = require('internal/streams/legacy');
const { Buffer } = require('buffer');
const {
addAbortSignal,
} = require('internal/streams/add-abort-signal');
const eos = require('internal/streams/end-of-stream');
let debug = require('internal/util/debuglog').debuglog('stream', (fn) => {
debug = fn;
});
const BufferList = require('internal/streams/buffer_list');
const destroyImpl = require('internal/streams/destroy');
const {
getHighWaterMark,
getDefaultHighWaterMark
} = require('internal/streams/state');
const {
aggregateTwoErrors,
codes: {
ERR_INVALID_ARG_TYPE,
ERR_METHOD_NOT_IMPLEMENTED,
ERR_OUT_OF_RANGE,
ERR_STREAM_PUSH_AFTER_EOF,
ERR_STREAM_UNSHIFT_AFTER_END_EVENT,
}
} = require('internal/errors');
const { validateObject } = require('internal/validators');
const kPaused = Symbol('kPaused');
const { StringDecoder } = require('string_decoder');
const from = require('internal/streams/from');
ObjectSetPrototypeOf(Readable.prototype, Stream.prototype);
ObjectSetPrototypeOf(Readable, Stream);
const nop = () => {};
const { errorOrDestroy } = destroyImpl;
function ReadableState(options, stream, isDuplex) {
// Duplex streams are both readable and writable, but share
// the same options object.
// However, some cases require setting options to different
// values for the readable and the writable sides of the duplex stream.
// These options can be provided separately as readableXXX and writableXXX.
if (typeof isDuplex !== 'boolean')
isDuplex = stream instanceof Stream.Duplex;
// Object stream flag. Used to make read(n) ignore n and to
// make all the buffer merging and length checks go away.
this.objectMode = !!(options && options.objectMode);
if (isDuplex)
this.objectMode = this.objectMode ||
!!(options && options.readableObjectMode);
// The point at which it stops calling _read() to fill the buffer
// Note: 0 is a valid value, means "don't call _read preemptively ever"
this.highWaterMark = options ?
getHighWaterMark(this, options, 'readableHighWaterMark', isDuplex) :
getDefaultHighWaterMark(false);
// A linked list is used to store data chunks instead of an array because the
// linked list can remove elements from the beginning faster than
// array.shift().
this.buffer = new BufferList();
this.length = 0;
this.pipes = [];
this.flowing = null;
this.ended = false;
this.endEmitted = false;
this.reading = false;
// Stream is still being constructed and cannot be
// destroyed until construction finished or failed.
// Async construction is opt in, therefore we start as
// constructed.
this.constructed = true;
// A flag to be able to tell if the event 'readable'/'data' is emitted
// immediately, or on a later tick. We set this to true at first, because
// any actions that shouldn't happen until "later" should generally also
// not happen before the first read call.
this.sync = true;
// Whenever we return null, then we set a flag to say
// that we're awaiting a 'readable' event emission.
this.needReadable = false;
this.emittedReadable = false;
this.readableListening = false;
this.resumeScheduled = false;
this[kPaused] = null;
// True if the error was already emitted and should not be thrown again.
this.errorEmitted = false;
// Should close be emitted on destroy. Defaults to true.
this.emitClose = !options || options.emitClose !== false;
// Should .destroy() be called after 'end' (and potentially 'finish').
this.autoDestroy = !options || options.autoDestroy !== false;
// Has it been destroyed.
this.destroyed = false;
// Indicates whether the stream has errored. When true no further
// _read calls, 'data' or 'readable' events should occur. This is needed
// since when autoDestroy is disabled we need a way to tell whether the
// stream has failed.
this.errored = null;
// Indicates whether the stream has finished destroying.
this.closed = false;
// True if close has been emitted or would have been emitted
// depending on emitClose.
this.closeEmitted = false;
// Crypto is kind of old and crusty. Historically, its default string
// encoding is 'binary' so we have to make this configurable.
// Everything else in the universe uses 'utf8', though.
this.defaultEncoding = (options && options.defaultEncoding) || 'utf8';
// Ref the piped dest which we need a drain event on it
// type: null | Writable | Set<Writable>.
this.awaitDrainWriters = null;
this.multiAwaitDrain = false;
// If true, a maybeReadMore has been scheduled.
this.readingMore = false;
this.dataEmitted = false;
this.decoder = null;
this.encoding = null;
if (options && options.encoding) {
this.decoder = new StringDecoder(options.encoding);
this.encoding = options.encoding;
}
}
function Readable(options) {
if (!(this instanceof Readable))
return new Readable(options);
// Checking for a Stream.Duplex instance is faster here instead of inside
// the ReadableState constructor, at least with V8 6.5.
const isDuplex = this instanceof Stream.Duplex;
this._readableState = new ReadableState(options, this, isDuplex);
if (options) {
if (typeof options.read === 'function')
this._read = options.read;
if (typeof options.destroy === 'function')
this._destroy = options.destroy;
if (typeof options.construct === 'function')
this._construct = options.construct;
if (options.signal && !isDuplex)
addAbortSignal(options.signal, this);
}
Stream.call(this, options);
destroyImpl.construct(this, () => {
if (this._readableState.needReadable) {
maybeReadMore(this, this._readableState);
}
});
}
Readable.prototype.destroy = destroyImpl.destroy;
Readable.prototype._undestroy = destroyImpl.undestroy;
Readable.prototype._destroy = function(err, cb) {
cb(err);
};
Readable.prototype[EE.captureRejectionSymbol] = function(err) {
this.destroy(err);
};
// Manually shove something into the read() buffer.
// This returns true if the highWaterMark has not been hit yet,
// similar to how Writable.write() returns true if you should
// write() some more.
Readable.prototype.push = function(chunk, encoding) {
return readableAddChunk(this, chunk, encoding, false);
};
// Unshift should *always* be something directly out of read().
Readable.prototype.unshift = function(chunk, encoding) {
return readableAddChunk(this, chunk, encoding, true);
};
function readableAddChunk(stream, chunk, encoding, addToFront) {
debug('readableAddChunk', chunk);
const state = stream._readableState;
let err;
if (!state.objectMode) {
if (typeof chunk === 'string') {
encoding = encoding || state.defaultEncoding;
if (state.encoding !== encoding) {
if (addToFront && state.encoding) {
// When unshifting, if state.encoding is set, we have to save
// the string in the BufferList with the state encoding.
chunk = Buffer.from(chunk, encoding).toString(state.encoding);
} else {
chunk = Buffer.from(chunk, encoding);
encoding = '';
}
}
} else if (chunk instanceof Buffer) {
encoding = '';
} else if (Stream._isUint8Array(chunk)) {
chunk = Stream._uint8ArrayToBuffer(chunk);
encoding = '';
} else if (chunk != null) {
err = new ERR_INVALID_ARG_TYPE(
'chunk', ['string', 'Buffer', 'Uint8Array'], chunk);
}
}
if (err) {
errorOrDestroy(stream, err);
} else if (chunk === null) {
state.reading = false;
onEofChunk(stream, state);
} else if (state.objectMode || (chunk && chunk.length > 0)) {
if (addToFront) {
if (state.endEmitted)
errorOrDestroy(stream, new ERR_STREAM_UNSHIFT_AFTER_END_EVENT());
else if (state.destroyed || state.errored)
return false;
else
addChunk(stream, state, chunk, true);
} else if (state.ended) {
errorOrDestroy(stream, new ERR_STREAM_PUSH_AFTER_EOF());
} else if (state.destroyed || state.errored) {
return false;
} else {
state.reading = false;
if (state.decoder && !encoding) {
chunk = state.decoder.write(chunk);
if (state.objectMode || chunk.length !== 0)
addChunk(stream, state, chunk, false);
else
maybeReadMore(stream, state);
} else {
addChunk(stream, state, chunk, false);
}
}
} else if (!addToFront) {
state.reading = false;
maybeReadMore(stream, state);
}
// We can push more data if we are below the highWaterMark.
// Also, if we have no data yet, we can stand some more bytes.
// This is to work around cases where hwm=0, such as the repl.
return !state.ended &&
(state.length < state.highWaterMark || state.length === 0);
}
function addChunk(stream, state, chunk, addToFront) {
if (state.flowing && state.length === 0 && !state.sync &&
stream.listenerCount('data') > 0) {
// Use the guard to avoid creating `Set()` repeatedly
// when we have multiple pipes.
if (state.multiAwaitDrain) {
state.awaitDrainWriters.clear();
} else {
state.awaitDrainWriters = null;
}
state.dataEmitted = true;
stream.emit('data', chunk);
} else {
// Update the buffer info.
state.length += state.objectMode ? 1 : chunk.length;
if (addToFront)
state.buffer.unshift(chunk);
else
state.buffer.push(chunk);
if (state.needReadable)
emitReadable(stream);
}
maybeReadMore(stream, state);
}
Readable.prototype.isPaused = function() {
const state = this._readableState;
return state[kPaused] === true || state.flowing === false;
};
// Backwards compatibility.
Readable.prototype.setEncoding = function(enc) {
const decoder = new StringDecoder(enc);
this._readableState.decoder = decoder;
// If setEncoding(null), decoder.encoding equals utf8.
this._readableState.encoding = this._readableState.decoder.encoding;
const buffer = this._readableState.buffer;
// Iterate over current buffer to convert already stored Buffers:
let content = '';
for (const data of buffer) {
content += decoder.write(data);
}
buffer.clear();
if (content !== '')
buffer.push(content);
this._readableState.length = content.length;
return this;
};
// Don't raise the hwm > 1GB.
const MAX_HWM = 0x40000000;
function computeNewHighWaterMark(n) {
if (n > MAX_HWM) {
throw new ERR_OUT_OF_RANGE('size', '<= 1GiB', n);
} else {
// Get the next highest power of 2 to prevent increasing hwm excessively in
// tiny amounts.
n--;
n |= n >>> 1;
n |= n >>> 2;
n |= n >>> 4;
n |= n >>> 8;
n |= n >>> 16;
n++;
}
return n;
}
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function howMuchToRead(n, state) {
if (n <= 0 || (state.length === 0 && state.ended))
return 0;
if (state.objectMode)
return 1;
if (NumberIsNaN(n)) {
// Only flow one buffer at a time.
if (state.flowing && state.length)
return state.buffer.first().length;
return state.length;
}
if (n <= state.length)
return n;
return state.ended ? state.length : 0;
}
// You can override either this method, or the async _read(n) below.
Readable.prototype.read = function(n) {
debug('read', n);
// Same as parseInt(undefined, 10), however V8 7.3 performance regressed
// in this scenario, so we are doing it manually.
if (n === undefined) {
n = NaN;
} else if (!NumberIsInteger(n)) {
n = NumberParseInt(n, 10);
}
const state = this._readableState;
const nOrig = n;
// If we're asking for more than the current hwm, then raise the hwm.
if (n > state.highWaterMark)
state.highWaterMark = computeNewHighWaterMark(n);
if (n !== 0)
state.emittedReadable = false;
// If we're doing read(0) to trigger a readable event, but we
// already have a bunch of data in the buffer, then just trigger
// the 'readable' event and move on.
if (n === 0 &&
state.needReadable &&
((state.highWaterMark !== 0 ?
state.length >= state.highWaterMark :
state.length > 0) ||
state.ended)) {
debug('read: emitReadable', state.length, state.ended);
if (state.length === 0 && state.ended)
endReadable(this);
else
emitReadable(this);
return null;
}
n = howMuchToRead(n, state);
// If we've ended, and we're now clear, then finish it up.
if (n === 0 && state.ended) {
if (state.length === 0)
endReadable(this);
return null;
}
// All the actual chunk generation logic needs to be
// *below* the call to _read. The reason is that in certain
// synthetic stream cases, such as passthrough streams, _read
// may be a completely synchronous operation which may change
// the state of the read buffer, providing enough data when
// before there was *not* enough.
//
// So, the steps are:
// 1. Figure out what the state of things will be after we do
// a read from the buffer.
//
// 2. If that resulting state will trigger a _read, then call _read.
// Note that this may be asynchronous, or synchronous. Yes, it is
// deeply ugly to write APIs this way, but that still doesn't mean
// that the Readable class should behave improperly, as streams are
// designed to be sync/async agnostic.
// Take note if the _read call is sync or async (ie, if the read call
// has returned yet), so that we know whether or not it's safe to emit
// 'readable' etc.
//
// 3. Actually pull the requested chunks out of the buffer and return.
// if we need a readable event, then we need to do some reading.
let doRead = state.needReadable;
debug('need readable', doRead);
// If we currently have less than the highWaterMark, then also read some.
if (state.length === 0 || state.length - n < state.highWaterMark) {
doRead = true;
debug('length less than watermark', doRead);
}
// However, if we've ended, then there's no point, if we're already
// reading, then it's unnecessary, if we're constructing we have to wait,
// and if we're destroyed or errored, then it's not allowed,
if (state.ended || state.reading || state.destroyed || state.errored ||
!state.constructed) {
doRead = false;
debug('reading, ended or constructing', doRead);
} else if (doRead) {
debug('do read');
state.reading = true;
state.sync = true;
// If the length is currently zero, then we *need* a readable event.
if (state.length === 0)
state.needReadable = true;
// Call internal read method
try {
this._read(state.highWaterMark);
} catch (err) {
errorOrDestroy(this, err);
}
state.sync = false;
// If _read pushed data synchronously, then `reading` will be false,
// and we need to re-evaluate how much data we can return to the user.
if (!state.reading)
n = howMuchToRead(nOrig, state);
}
let ret;
if (n > 0)
ret = fromList(n, state);
else
ret = null;
if (ret === null) {
state.needReadable = state.length <= state.highWaterMark;
n = 0;
} else {
state.length -= n;
if (state.multiAwaitDrain) {
state.awaitDrainWriters.clear();
} else {
state.awaitDrainWriters = null;
}
}
if (state.length === 0) {
// If we have nothing in the buffer, then we want to know
// as soon as we *do* get something into the buffer.
if (!state.ended)
state.needReadable = true;
// If we tried to read() past the EOF, then emit end on the next tick.
if (nOrig !== n && state.ended)
endReadable(this);
}
if (ret !== null && !state.errorEmitted && !state.closeEmitted) {
state.dataEmitted = true;
this.emit('data', ret);
}
return ret;
};
function onEofChunk(stream, state) {
debug('onEofChunk');
if (state.ended) return;
if (state.decoder) {
const chunk = state.decoder.end();
if (chunk && chunk.length) {
state.buffer.push(chunk);
state.length += state.objectMode ? 1 : chunk.length;
}
}
state.ended = true;
if (state.sync) {
// If we are sync, wait until next tick to emit the data.
// Otherwise we risk emitting data in the flow()
// the readable code triggers during a read() call.
emitReadable(stream);
} else {
// Emit 'readable' now to make sure it gets picked up.
state.needReadable = false;
state.emittedReadable = true;
// We have to emit readable now that we are EOF. Modules
// in the ecosystem (e.g. dicer) rely on this event being sync.
emitReadable_(stream);
}
}
// Don't emit readable right away in sync mode, because this can trigger
// another read() call => stack overflow. This way, it might trigger
// a nextTick recursion warning, but that's not so bad.
function emitReadable(stream) {
const state = stream._readableState;
debug('emitReadable', state.needReadable, state.emittedReadable);
state.needReadable = false;
if (!state.emittedReadable) {
debug('emitReadable', state.flowing);
state.emittedReadable = true;
process.nextTick(emitReadable_, stream);
}
}
function emitReadable_(stream) {
const state = stream._readableState;
debug('emitReadable_', state.destroyed, state.length, state.ended);
if (!state.destroyed && !state.errored && (state.length || state.ended)) {
stream.emit('readable');
state.emittedReadable = false;
}
// The stream needs another readable event if:
// 1. It is not flowing, as the flow mechanism will take
// care of it.
// 2. It is not ended.
// 3. It is below the highWaterMark, so we can schedule
// another readable later.
state.needReadable =
!state.flowing &&
!state.ended &&
state.length <= state.highWaterMark;
flow(stream);
}
// At this point, the user has presumably seen the 'readable' event,
// and called read() to consume some data. that may have triggered
// in turn another _read(n) call, in which case reading = true if
// it's in progress.
// However, if we're not ended, or reading, and the length < hwm,
// then go ahead and try to read some more preemptively.
function maybeReadMore(stream, state) {
if (!state.readingMore && state.constructed) {
state.readingMore = true;
process.nextTick(maybeReadMore_, stream, state);
}
}
function maybeReadMore_(stream, state) {
// Attempt to read more data if we should.
//
// The conditions for reading more data are (one of):
// - Not enough data buffered (state.length < state.highWaterMark). The loop
// is responsible for filling the buffer with enough data if such data
// is available. If highWaterMark is 0 and we are not in the flowing mode
// we should _not_ attempt to buffer any extra data. We'll get more data
// when the stream consumer calls read() instead.
// - No data in the buffer, and the stream is in flowing mode. In this mode
// the loop below is responsible for ensuring read() is called. Failing to
// call read here would abort the flow and there's no other mechanism for
// continuing the flow if the stream consumer has just subscribed to the
// 'data' event.
//
// In addition to the above conditions to keep reading data, the following
// conditions prevent the data from being read:
// - The stream has ended (state.ended).
// - There is already a pending 'read' operation (state.reading). This is a
// case where the stream has called the implementation defined _read()
// method, but they are processing the call asynchronously and have _not_
// called push() with new data. In this case we skip performing more
// read()s. The execution ends in this method again after the _read() ends
// up calling push() with more data.
while (!state.reading && !state.ended &&
(state.length < state.highWaterMark ||
(state.flowing && state.length === 0))) {
const len = state.length;
debug('maybeReadMore read 0');
stream.read(0);
if (len === state.length)
// Didn't get any data, stop spinning.
break;
}
state.readingMore = false;
}
// Abstract method. to be overridden in specific implementation classes.
// call cb(er, data) where data is <= n in length.
// for virtual (non-string, non-buffer) streams, "length" is somewhat
// arbitrary, and perhaps not very meaningful.
Readable.prototype._read = function(n) {
throw new ERR_METHOD_NOT_IMPLEMENTED('_read()');
};
Readable.prototype.pipe = function(dest, pipeOpts) {
const src = this;
const state = this._readableState;
if (state.pipes.length === 1) {
if (!state.multiAwaitDrain) {
state.multiAwaitDrain = true;
state.awaitDrainWriters = new SafeSet(
state.awaitDrainWriters ? [state.awaitDrainWriters] : []
);
}
}
state.pipes.push(dest);
debug('pipe count=%d opts=%j', state.pipes.length, pipeOpts);
const doEnd = (!pipeOpts || pipeOpts.end !== false) &&
dest !== process.stdout &&
dest !== process.stderr;
const endFn = doEnd ? onend : unpipe;
if (state.endEmitted)
process.nextTick(endFn);
else
src.once('end', endFn);
dest.on('unpipe', onunpipe);
function onunpipe(readable, unpipeInfo) {
debug('onunpipe');
if (readable === src) {
if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
unpipeInfo.hasUnpiped = true;
cleanup();
}
}
}
function onend() {
debug('onend');
dest.end();
}
let ondrain;
let cleanedUp = false;
function cleanup() {
debug('cleanup');
// Cleanup event handlers once the pipe is broken.
dest.removeListener('close', onclose);
dest.removeListener('finish', onfinish);
if (ondrain) {
dest.removeListener('drain', ondrain);
}
dest.removeListener('error', onerror);
dest.removeListener('unpipe', onunpipe);
src.removeListener('end', onend);
src.removeListener('end', unpipe);
src.removeListener('data', ondata);
cleanedUp = true;
// If the reader is waiting for a drain event from this
// specific writer, then it would cause it to never start
// flowing again.
// So, if this is awaiting a drain, then we just call it now.
// If we don't know, then assume that we are waiting for one.
if (ondrain && state.awaitDrainWriters &&
(!dest._writableState || dest._writableState.needDrain))
ondrain();
}
function pause() {
// If the user unpiped during `dest.write()`, it is possible
// to get stuck in a permanently paused state if that write
// also returned false.
// => Check whether `dest` is still a piping destination.
if (!cleanedUp) {
if (state.pipes.length === 1 && state.pipes[0] === dest) {
debug('false write response, pause', 0);
state.awaitDrainWriters = dest;
state.multiAwaitDrain = false;
} else if (state.pipes.length > 1 && state.pipes.includes(dest)) {
debug('false write response, pause', state.awaitDrainWriters.size);
state.awaitDrainWriters.add(dest);
}
src.pause();
}
if (!ondrain) {
// When the dest drains, it reduces the awaitDrain counter
// on the source. This would be more elegant with a .once()
// handler in flow(), but adding and removing repeatedly is
// too slow.
ondrain = pipeOnDrain(src, dest);
dest.on('drain', ondrain);
}
}
src.on('data', ondata);
function ondata(chunk) {
debug('ondata');
const ret = dest.write(chunk);
debug('dest.write', ret);
if (ret === false) {
pause();
}
}
// If the dest has an error, then stop piping into it.
// However, don't suppress the throwing behavior for this.
function onerror(er) {
debug('onerror', er);
unpipe();
dest.removeListener('error', onerror);
if (dest.listenerCount('error') === 0) {
const s = dest._writableState || dest._readableState;
if (s && !s.errorEmitted) {
// User incorrectly emitted 'error' directly on the stream.
errorOrDestroy(dest, er);
} else {
dest.emit('error', er);
}
}
}
// Make sure our error handler is attached before userland ones.
prependListener(dest, 'error', onerror);
// Both close and finish should trigger unpipe, but only once.
function onclose() {
dest.removeListener('finish', onfinish);
unpipe();
}
dest.once('close', onclose);
function onfinish() {
debug('onfinish');
dest.removeListener('close', onclose);
unpipe();
}
dest.once('finish', onfinish);
function unpipe() {
debug('unpipe');
src.unpipe(dest);
}
// Tell the dest that it's being piped to.
dest.emit('pipe', src);
// Start the flow if it hasn't been started already.
if (dest.writableNeedDrain === true) {
if (state.flowing) {
pause();
}
} else if (!state.flowing) {
debug('pipe resume');
src.resume();
}
return dest;
};
function pipeOnDrain(src, dest) {
return function pipeOnDrainFunctionResult() {
const state = src._readableState;
// `ondrain` will call directly,
// `this` maybe not a reference to dest,
// so we use the real dest here.
if (state.awaitDrainWriters === dest) {
debug('pipeOnDrain', 1);
state.awaitDrainWriters = null;
} else if (state.multiAwaitDrain) {
debug('pipeOnDrain', state.awaitDrainWriters.size);
state.awaitDrainWriters.delete(dest);
}
if ((!state.awaitDrainWriters || state.awaitDrainWriters.size === 0) &&
src.listenerCount('data')) {
src.resume();
}
};
}
Readable.prototype.unpipe = function(dest) {
const state = this._readableState;
const unpipeInfo = { hasUnpiped: false };
// If we're not piping anywhere, then do nothing.
if (state.pipes.length === 0)
return this;
if (!dest) {
// remove all.
const dests = state.pipes;
state.pipes = [];
this.pause();
for (let i = 0; i < dests.length; i++)
dests[i].emit('unpipe', this, { hasUnpiped: false });
return this;
}
// Try to find the right one.
const index = ArrayPrototypeIndexOf(state.pipes, dest);
if (index === -1)
return this;
state.pipes.splice(index, 1);
if (state.pipes.length === 0)
this.pause();
dest.emit('unpipe', this, unpipeInfo);
return this;
};
// Set up data events if they are asked for
// Ensure readable listeners eventually get something.
Readable.prototype.on = function(ev, fn) {
const res = Stream.prototype.on.call(this, ev, fn);
const state = this._readableState;
if (ev === 'data') {
// Update readableListening so that resume() may be a no-op
// a few lines down. This is needed to support once('readable').
state.readableListening = this.listenerCount('readable') > 0;
// Try start flowing on next tick if stream isn't explicitly paused.
if (state.flowing !== false)
this.resume();
} else if (ev === 'readable') {
if (!state.endEmitted && !state.readableListening) {
state.readableListening = state.needReadable = true;
state.flowing = false;
state.emittedReadable = false;
debug('on readable', state.length, state.reading);
if (state.length) {
emitReadable(this);
} else if (!state.reading) {
process.nextTick(nReadingNextTick, this);
}
}
}
return res;
};
Readable.prototype.addListener = Readable.prototype.on;
Readable.prototype.removeListener = function(ev, fn) {
const res = Stream.prototype.removeListener.call(this,
ev, fn);
if (ev === 'readable') {
// We need to check if there is someone still listening to
// readable and reset the state. However this needs to happen
// after readable has been emitted but before I/O (nextTick) to
// support once('readable', fn) cycles. This means that calling
// resume within the same tick will have no
// effect.
process.nextTick(updateReadableListening, this);
}
return res;
};
Readable.prototype.off = Readable.prototype.removeListener;
Readable.prototype.removeAllListeners = function(ev) {
const res = Stream.prototype.removeAllListeners.apply(this,
arguments);
if (ev === 'readable' || ev === undefined) {
// We need to check if there is someone still listening to
// readable and reset the state. However this needs to happen
// after readable has been emitted but before I/O (nextTick) to
// support once('readable', fn) cycles. This means that calling
// resume within the same tick will have no
// effect.
process.nextTick(updateReadableListening, this);
}
return res;
};
function updateReadableListening(self) {
const state = self._readableState;
state.readableListening = self.listenerCount('readable') > 0;
if (state.resumeScheduled && state[kPaused] === false) {
// Flowing needs to be set to true now, otherwise
// the upcoming resume will not flow.
state.flowing = true;
// Crude way to check if we should resume.
} else if (self.listenerCount('data') > 0) {
self.resume();
} else if (!state.readableListening) {
state.flowing = null;
}
}
function nReadingNextTick(self) {
debug('readable nexttick read 0');
self.read(0);
}
// pause() and resume() are remnants of the legacy readable stream API
// If the user uses them, then switch into old mode.
Readable.prototype.resume = function() {
const state = this._readableState;
if (!state.flowing) {
debug('resume');
// We flow only if there is no one listening
// for readable, but we still have to call
// resume().
state.flowing = !state.readableListening;
resume(this, state);
}
state[kPaused] = false;
return this;
};
function resume(stream, state) {
if (!state.resumeScheduled) {
state.resumeScheduled = true;
process.nextTick(resume_, stream, state);
}
}
function resume_(stream, state) {
debug('resume', state.reading);
if (!state.reading) {
stream.read(0);
}
state.resumeScheduled = false;
stream.emit('resume');
flow(stream);
if (state.flowing && !state.reading)
stream.read(0);
}
Readable.prototype.pause = function() {
debug('call pause flowing=%j', this._readableState.flowing);
if (this._readableState.flowing !== false) {
debug('pause');
this._readableState.flowing = false;
this.emit('pause');
}
this._readableState[kPaused] = true;
return this;
};
function flow(stream) {
const state = stream._readableState;
debug('flow', state.flowing);
while (state.flowing && stream.read() !== null);
}
// Wrap an old-style stream as the async data source.
// This is *not* part of the readable stream interface.
// It is an ugly unfortunate mess of history.
Readable.prototype.wrap = function(stream) {
let paused = false;
// TODO (ronag): Should this.destroy(err) emit
// 'error' on the wrapped stream? Would require
// a static factory method, e.g. Readable.wrap(stream).
stream.on('data', (chunk) => {
if (!this.push(chunk) && stream.pause) {
paused = true;
stream.pause();
}
});
stream.on('end', () => {
this.push(null);
});
stream.on('error', (err) => {
errorOrDestroy(this, err);
});
stream.on('close', () => {
this.destroy();
});
stream.on('destroy', () => {
this.destroy();
});
this._read = () => {
if (paused && stream.resume) {
paused = false;
stream.resume();
}
};
// Proxy all the other methods. Important when wrapping filters and duplexes.
const streamKeys = ObjectKeys(stream);
for (let j = 1; j < streamKeys.length; j++) {
const i = streamKeys[j];
if (this[i] === undefined && typeof stream[i] === 'function') {
this[i] = stream[i].bind(stream);
}
}
return this;
};
Readable.prototype[SymbolAsyncIterator] = function() {
return streamToAsyncIterator(this);
};
Readable.prototype.iterator = function(options) {
if (options !== undefined) {
validateObject(options, 'options');
}
return streamToAsyncIterator(this, options);
};
function streamToAsyncIterator(stream, options) {
if (typeof stream.read !== 'function') {
stream = Readable.wrap(stream, { objectMode: true });
}
const iter = createAsyncIterator(stream, options);
iter.stream = stream;
return iter;
}
async function* createAsyncIterator(stream, options) {
let callback = nop;
function next(resolve) {
if (this === stream) {
callback();
callback = nop;
} else {
callback = resolve;
}
}
stream.on('readable', next);
let error;
const cleanup = eos(stream, { writable: false }, (err) => {
error = err ? aggregateTwoErrors(error, err) : null;
callback();
callback = nop;
});
try {
while (true) {
const chunk = stream.destroyed ? null : stream.read();
if (chunk !== null) {
yield chunk;
} else if (error) {
throw error;
} else if (error === null) {
return;
} else {
await new Promise(next);
}
}
} catch (err) {
error = aggregateTwoErrors(error, err);
throw error;
} finally {
if (
(error || options?.destroyOnReturn !== false) &&
(error === undefined || stream._readableState.autoDestroy)
) {
destroyImpl.destroyer(stream, null);
} else {
stream.off('readable', next);
cleanup();
}
}
}
// Making it explicit these properties are not enumerable
// because otherwise some prototype manipulation in
// userland will fail.
ObjectDefineProperties(Readable.prototype, {
readable: {
__proto__: null,
get() {
const r = this._readableState;
// r.readable === false means that this is part of a Duplex stream
// where the readable side was disabled upon construction.
// Compat. The user might manually disable readable side through
// deprecated setter.
return !!r && r.readable !== false && !r.destroyed && !r.errorEmitted &&
!r.endEmitted;
},
set(val) {
// Backwards compat.
if (this._readableState) {
this._readableState.readable = !!val;
}
}
},
readableDidRead: {
__proto__: null,
enumerable: false,
get: function() {
return this._readableState.dataEmitted;
}
},
readableAborted: {
__proto__: null,
enumerable: false,
get: function() {
return !!(
this._readableState.readable !== false &&
(this._readableState.destroyed || this._readableState.errored) &&
!this._readableState.endEmitted
);
}
},
readableHighWaterMark: {
__proto__: null,
enumerable: false,
get: function() {
return this._readableState.highWaterMark;
}
},
readableBuffer: {
__proto__: null,
enumerable: false,
get: function() {
return this._readableState && this._readableState.buffer;
}
},
readableFlowing: {
__proto__: null,
enumerable: false,
get: function() {
return this._readableState.flowing;
},
set: function(state) {
if (this._readableState) {
this._readableState.flowing = state;
}
}
},
readableLength: {
__proto__: null,
enumerable: false,
get() {
return this._readableState.length;
}
},
readableObjectMode: {
__proto__: null,
enumerable: false,
get() {
return this._readableState ? this._readableState.objectMode : false;
}
},
readableEncoding: {
__proto__: null,
enumerable: false,
get() {
return this._readableState ? this._readableState.encoding : null;
}
},
errored: {
__proto__: null,
enumerable: false,
get() {
return this._readableState ? this._readableState.errored : null;
}
},
closed: {
__proto__: null,
get() {
return this._readableState ? this._readableState.closed : false;
}
},
destroyed: {
__proto__: null,
enumerable: false,
get() {
return this._readableState ? this._readableState.destroyed : false;
},
set(value) {
// We ignore the value if the stream
// has not been initialized yet.
if (!this._readableState) {
return;
}
// Backward compatibility, the user is explicitly
// managing destroyed.
this._readableState.destroyed = value;
}
},
readableEnded: {
__proto__: null,
enumerable: false,
get() {
return this._readableState ? this._readableState.endEmitted : false;
}
},
});
ObjectDefineProperties(ReadableState.prototype, {
// Legacy getter for `pipesCount`.
pipesCount: {
__proto__: null,
get() {
return this.pipes.length;
}
},
// Legacy property for `paused`.
paused: {
__proto__: null,
get() {
return this[kPaused] !== false;
},
set(value) {
this[kPaused] = !!value;
}
}
});
// Exposed for testing purposes only.
Readable._fromList = fromList;
// Pluck off n bytes from an array of buffers.
// Length is the combined lengths of all the buffers in the list.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function fromList(n, state) {
// nothing buffered.
if (state.length === 0)
return null;
let ret;
if (state.objectMode)
ret = state.buffer.shift();
else if (!n || n >= state.length) {
// Read it all, truncate the list.
if (state.decoder)
ret = state.buffer.join('');
else if (state.buffer.length === 1)
ret = state.buffer.first();
else
ret = state.buffer.concat(state.length);
state.buffer.clear();
} else {
// read part of list.
ret = state.buffer.consume(n, state.decoder);
}
return ret;
}
function endReadable(stream) {
const state = stream._readableState;
debug('endReadable', state.endEmitted);
if (!state.endEmitted) {
state.ended = true;
process.nextTick(endReadableNT, state, stream);
}
}
function endReadableNT(state, stream) {
debug('endReadableNT', state.endEmitted, state.length);
// Check that we didn't get one last unshift.
if (!state.errored && !state.closeEmitted &&
!state.endEmitted && state.length === 0) {
state.endEmitted = true;
stream.emit('end');
if (stream.writable && stream.allowHalfOpen === false) {
process.nextTick(endWritableNT, stream);
} else if (state.autoDestroy) {
// In case of duplex streams we need a way to detect
// if the writable side is ready for autoDestroy as well.
const wState = stream._writableState;
const autoDestroy = !wState || (
wState.autoDestroy &&
// We don't expect the writable to ever 'finish'
// if writable is explicitly set to false.
(wState.finished || wState.writable === false)
);
if (autoDestroy) {
stream.destroy();
}
}
}
}
function endWritableNT(stream) {
const writable = stream.writable && !stream.writableEnded &&
!stream.destroyed;
if (writable) {
stream.end();
}
}
Readable.from = function(iterable, opts) {
return from(Readable, iterable, opts);
};
let webStreamsAdapters;
// Lazy to avoid circular references
function lazyWebStreams() {
if (webStreamsAdapters === undefined)
webStreamsAdapters = require('internal/webstreams/adapters');
return webStreamsAdapters;
}
Readable.fromWeb = function(readableStream, options) {
return lazyWebStreams().newStreamReadableFromReadableStream(
readableStream,
options);
};
Readable.toWeb = function(streamReadable, options) {
return lazyWebStreams().newReadableStreamFromStreamReadable(
streamReadable,
options);
};
Readable.wrap = function(src, options) {
return new Readable({
objectMode: src.readableObjectMode ?? src.objectMode ?? true,
...options,
destroy(err, callback) {
destroyImpl.destroyer(src, err);
callback(err);
}
}).wrap(src);
};
|