moonbridge: 5e8eeb5b6c84 moonbridge

moonbridge

view moonbridge_io.c @ 104:5e8eeb5b6c84

Some code cleanup in I/O library

author	jbe
date	Wed Apr 08 18:38:14 2015 +0200 (2015-04-08)
parents	4f9e4c6109f4
children	11d03470ef19

line source

2 #include <stdlib.h>

3 #include <unistd.h>

4 #include <stdint.h>

5 #include <errno.h>

6 #include <string.h>

7 #include <sys/socket.h>

8 #include <sys/select.h>

9 #include <fcntl.h>

10 #include <netinet/in.h>

11 #include <netinet/tcp.h>

12 #include <sys/types.h>

13 #include <netdb.h>

15 #include <lua.h>

16 #include <lauxlib.h>

17 #include <lualib.h>

19 #define MOONBR_IO_MAXSTRERRORLEN 80

20 #define MOONBR_IO_READBUFLEN 4096

21 #define MOONBR_IO_WRITEBUFLEN 4096

23 #define moonbr_io_errmsg() \

24 char errmsg[MOONBR_IO_MAXSTRERRORLEN]; \

25 strerror_r(errno, errmsg, MOONBR_IO_MAXSTRERRORLEN)

27 #define MOONBR_IO_HANDLE_MT_REGKEY "moonbridge_io_handle"

28 #define MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY "moonbridge_io_handle_public"

30 typedef struct {

31 int fd;

32 int isnetwork;

33 int finished;

34 int closed;

35 int nonblocking;

36 int nopush;

37 int readerr;

38 int readbufcnt;

39 int writeerr;

40 size_t writeleft;

41 #if LUA_VERSION_NUM >= 503

42 lua_Integer writeqin;

43 lua_Integer writeqout;

44 #else

45 int writeqin;

46 int writeqout;

47 #endif

48 size_t writeqoff;

49 int writebufin;

50 int writebufout;

51 char readbuf[MOONBR_IO_READBUFLEN];

52 char writebuf[MOONBR_IO_WRITEBUFLEN];

53 } moonbr_io_handle_t;

55 static void moonbr_io_handle_set_nonblocking(lua_State *L, moonbr_io_handle_t *handle, int nonblocking) {

56 int flags;

57 if (handle->nonblocking == nonblocking) return;

58 flags = fcntl(handle->fd, F_GETFL, 0);

59 if (flags == -1) {

60 moonbr_io_errmsg();

61 close(handle->fd);

62 handle->fd = -1;

63 handle->closed = 1;

64 luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);

65 }

66 if (nonblocking) flags |= O_NONBLOCK;

67 else flags &= ~O_NONBLOCK;

68 if (fcntl(handle->fd, F_SETFL, flags) == -1) {

69 moonbr_io_errmsg();

70 close(handle->fd);

71 handle->fd = -1;

72 handle->closed = 1;

73 luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);

74 }

75 handle->nonblocking = nonblocking;

76 }

78 static void moonbr_io_handle_set_linger(lua_State *L, moonbr_io_handle_t *handle, int timeout) {

79 struct linger lingerval = { 0, };

80 if (!handle->isnetwork) return;

81 if (timeout >= 0) {

82 lingerval.l_onoff = 1;

83 lingerval.l_linger = timeout;

84 }

85 if (setsockopt(handle->fd, SOL_SOCKET, SO_LINGER, &lingerval, sizeof(lingerval))) {

86 moonbr_io_errmsg();

87 close(handle->fd);

88 handle->fd = -1;

89 handle->closed = 1;

90 luaL_error(L, "Unexpected error while setting SO_LINGER with setsockopt: %s", errmsg);

91 }

92 }

94 static void moonbr_io_handle_set_nopush(lua_State *L, moonbr_io_handle_t *handle, int nopush) {

95 #if defined(TCP_NOPUSH) || defined(TCP_CORK)

96 if (!handle->isnetwork || handle->nopush == nopush) return;

97 #if defined(TCP_NOPUSH)

98 if (setsockopt(handle->fd, IPPROTO_TCP, TCP_NOPUSH, &nopush, sizeof(nopush))) {

99 #elif defined(TCP_CORK)

100 if (setsockopt(handle->fd, IPPROTO_TCP, TCP_CORK, &nopush, sizeof(nopush))) {

101 #endif

102 moonbr_io_errmsg();

103 close(handle->fd);

104 handle->fd = -1;

105 handle->closed = 1;

106 #if defined(TCP_NOPUSH)

107 luaL_error(L, "Unexpected error while setting TCP_NOPUSH with setsockopt: %s", errmsg);

108 #elif defined(TCP_CORK)

109 luaL_error(L, "Unexpected error while setting TCP_CORK with setsockopt: %s", errmsg);

110 #endif

111 }

112 handle->nopush = nopush;

113 #else

114 #warning Neither TCP_NOPUSH nor TCP_CORK is available

115 #endif

116 }

117

118 static int moonbr_io_read_impl(lua_State *L, int nonblocking, int drain) {

119 moonbr_io_handle_t *handle;

120 lua_Integer maxread;

121 const char *terminatorstr;

122 size_t terminatorlen;

123 char terminator;

124 luaL_Buffer luabuf;

125 size_t luabufcnt = 0;

126 int endcnt;

127 char *terminatorpos;

128 ssize_t bytesread;

129 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

130 maxread = luaL_optinteger(L, 2, 0);

131 terminatorstr = luaL_optlstring(L, 3, "", &terminatorlen);

132 if (terminatorlen) {

133 luaL_argcheck(L, terminatorlen == 1, 3, "single byte expected");

134 terminator = terminatorstr[0];

135 }

136 lua_settop(L, 1); /* return handle on drain, terminator string may be garbage collected */

137 if (handle->closed) luaL_error(L, "Attempt to read from a closed I/O handle");

138 if (handle->readerr) {

139 lua_pushnil(L);

140 lua_pushliteral(L, "Previous read error");

141 return 2;

142 }

143 if (handle->fd < 0) goto moonbr_io_read_impl_eof; /* fake EOF to simulate shutdown */

144 handle->readerr = 1;

145 moonbr_io_handle_set_nonblocking(L, handle, nonblocking);

146 if (!drain) luaL_buffinit(L, &luabuf);

147 while (1) {

148 endcnt = -1;

149 if (maxread > 0 && handle->readbufcnt >= (size_t)maxread - luabufcnt) {

150 endcnt = maxread - luabufcnt;

151 } else if (terminatorlen) {

152 terminatorpos = memchr(handle->readbuf, terminator, handle->readbufcnt);

153 if (terminatorpos) endcnt = 1 + (terminatorpos - handle->readbuf);

154 }

155 if (endcnt >= 0) {

156 if (!drain) {

157 luaL_addlstring(&luabuf, handle->readbuf, endcnt);

158 luaL_pushresult(&luabuf);

159 } else {

160 luabufcnt += handle->readbufcnt;

161 lua_pushinteger(L, luabufcnt);

162 }

163 handle->readbufcnt -= endcnt;

164 memmove(handle->readbuf, handle->readbuf + endcnt, handle->readbufcnt);

165 handle->readerr = 0;

166 return 1;

167 }

168 if (!drain) luaL_addlstring(&luabuf, handle->readbuf, handle->readbufcnt);

169 luabufcnt += handle->readbufcnt;

170 handle->readbufcnt = 0;

171 do {

172 bytesread = read(handle->fd, handle->readbuf, MOONBR_IO_READBUFLEN);

173 } while (bytesread < 0 && (errno == EINTR));

174 if (bytesread == 0 || (nonblocking && bytesread < 0 && (errno == EAGAIN || errno == EWOULDBLOCK))) break;

175 if (bytesread < 0) {

176 moonbr_io_errmsg();

177 lua_pushnil(L);

178 lua_pushstring(L, errmsg);

179 return 2;

180 }

181 handle->readbufcnt += bytesread;

182 }

183 if (!drain) {

184 luaL_addlstring(&luabuf, handle->readbuf, handle->readbufcnt);

185 luaL_pushresult(&luabuf);

186 }

187 luabufcnt += handle->readbufcnt;

188 handle->readbufcnt = 0;

189 if (!drain) {

190 if (!luabufcnt && bytesread == 0) {

191 handle->readerr = 0;

192 moonbr_io_read_impl_eof:

193 lua_pushboolean(L, 0);

194 lua_pushliteral(L, "End of file");

195 return 2;

196 }

197 } else {

198 if (!luabufcnt && bytesread == 0) lua_pushboolean(L, 1);

199 else lua_pushboolean(L, luabufcnt);

200 }

201 handle->readerr = 0;

202 return 1;

203 }

204

205 static int moonbr_io_read(lua_State *L) {

206 return moonbr_io_read_impl(L, 0, 0);

207 }

208

209 static int moonbr_io_read_nb(lua_State *L) {

210 return moonbr_io_read_impl(L, 1, 0);

211 }

212

213 static int moonbr_io_drain(lua_State *L) {

214 return moonbr_io_read_impl(L, 0, 1);

215 }

216

217 static int moonbr_io_drain_nb(lua_State *L) {

218 return moonbr_io_read_impl(L, 1, 1);

219 }

220

221 static int moonbr_io_write_impl(lua_State *L, int nonblocking, int flush) {

222 moonbr_io_handle_t *handle;

223 int i, top;

224 const char *str;

225 size_t strlen;

226 ssize_t written;

227 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

228 if (handle->closed) luaL_error(L, "Attempt to write to a closed I/O handle");

229 if (handle->finished) luaL_error(L, "Attempt to write to a finished I/O handle");

230 if (handle->writeerr) {

231 lua_pushnil(L);

232 lua_pushliteral(L, "Previous write error");

233 return 2;

234 }

235 handle->writeerr = 1;

236 moonbr_io_handle_set_nonblocking(L, handle, nonblocking);

237 top = lua_gettop(L);

238 lua_getuservalue(L, 1);

239 lua_getfield(L, -1, "writequeue");

240 for (i=2; i<=top; i++) {

241 luaL_checklstring(L, i, &strlen);

242 lua_pushvalue(L, i);

243 lua_rawseti(L, -2, handle->writeqin++);

244 handle->writeleft += strlen;

245 }

246 while (handle->writeqout != handle->writeqin) {

247 lua_rawgeti(L, -1, handle->writeqout);

248 str = lua_tolstring(L, -1, &strlen);

249 while (handle->writeqoff < strlen) {

250 if (

251 strlen - handle->writeqoff <=

252 MOONBR_IO_WRITEBUFLEN - handle->writebufin

253 ) {

254 memcpy(

255 handle->writebuf + handle->writebufin,

256 str + handle->writeqoff,

257 strlen - handle->writeqoff

258 );

259 handle->writebufin += strlen - handle->writeqoff;

260 break;

261 } else {

262 moonbr_io_handle_set_nopush(L, handle, 1);

263 memcpy(

264 handle->writebuf + handle->writebufin,

265 str + handle->writeqoff,

266 MOONBR_IO_WRITEBUFLEN - handle->writebufin

267 );

268 handle->writeqoff += MOONBR_IO_WRITEBUFLEN - handle->writebufin;

269 while (handle->writebufout < MOONBR_IO_WRITEBUFLEN) {

270 written = write(

271 handle->fd,

272 handle->writebuf + handle->writebufout,

273 MOONBR_IO_WRITEBUFLEN - handle->writebufout

274 );

275 if (written < 0) {

276 if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {

277 goto moonbr_io_write_impl_block;

278 } else if (errno != EINTR) {

279 moonbr_io_errmsg();

280 lua_pushnil(L);

281 lua_pushstring(L, errmsg);

282 return 2;

283 }

284 } else {

285 handle->writebufout += written;

286 handle->writeleft -= written;

287 }

288 }

289 handle->writebufin = 0;

290 handle->writebufout = 0;

291 }

292 }

293 handle->writeqoff = 0;

294 lua_pop(L, 1);

295 lua_pushnil(L);

296 lua_rawseti(L, -2, handle->writeqout++);

297 }

298 if (flush) {

299 moonbr_io_handle_set_nopush(L, handle, 0);

300 while (handle->writebufout < handle->writebufin) {

301 written = write(

302 handle->fd,

303 handle->writebuf + handle->writebufout,

304 handle->writebufin - handle->writebufout

305 );

306 if (written < 0) {

307 if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {

308 goto moonbr_io_write_impl_block;

309 } else if (errno != EINTR) {

310 moonbr_io_errmsg();

311 lua_pushnil(L);

312 lua_pushstring(L, errmsg);

313 return 2;

314 }

315 } else {

316 handle->writebufout += written;

317 handle->writeleft -= written;

318 }

319 }

320 handle->writebufin = 0;

321 handle->writebufout = 0;

322 }

323 if (nonblocking) lua_pushinteger(L, 0);

324 else lua_pushvalue(L, 1);

325 handle->writeerr = 0;

326 return 1;

327 moonbr_io_write_impl_block:

328 lua_pushinteger(L, handle->writeleft);

329 handle->writeerr = 0;

330 return 1;

331 }

332

333 static int moonbr_io_write(lua_State *L) {

334 return moonbr_io_write_impl(L, 0, 0);

335 }

336

337 static int moonbr_io_write_nb(lua_State *L) {

338 return moonbr_io_write_impl(L, 1, 0);

339 }

340

341 static int moonbr_io_flush(lua_State *L) {

342 return moonbr_io_write_impl(L, 0, 1);

343 }

344

345 static int moonbr_io_flush_nb(lua_State *L) {

346 return moonbr_io_write_impl(L, 1, 1);

347 }

348

349 static int moonbr_io_finish(lua_State *L) {

350 moonbr_io_handle_t *handle;

351 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

352 if (handle->closed) luaL_error(L, "Attempt to finish a closed I/O handle");

353 if (handle->finished) luaL_error(L, "Attempt to finish a finished I/O handle");

354 if (handle->writeleft) {

355 lua_pushcfunction(L, moonbr_io_flush);

356 lua_pushvalue(L, 1);

357 lua_call(L, 1, 2);

358 if (!lua_toboolean(L, -2)) {

359 handle->finished = 1;

360 return 2;

361 }

362 }

363 handle->finished = 1;

364 if (handle->isnetwork) {

365 if (shutdown(handle->fd, SHUT_WR)) {

366 moonbr_io_errmsg();

367 lua_pushnil(L);

368 lua_pushstring(L, errmsg);

369 return 2;

370 }

371 } else {

372 if (close(handle->fd)) {

373 moonbr_io_errmsg();

374 handle->fd = -1;

375 lua_pushnil(L);

376 lua_pushstring(L, errmsg);

377 return 2;

378 }

379 handle->fd = -1; /* fake EOF on read */

380 }

381 lua_pushboolean(L, 1);

382 return 1;

383 }

384

385 static int moonbr_io_close_impl(lua_State *L, int reset) {

386 moonbr_io_handle_t *handle;

387 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

388 if (handle->closed) luaL_error(L, "Attempt to close a closed I/O handle");

389 if (!reset) {

390 if (handle->writeleft) {

391 lua_pushcfunction(L, moonbr_io_flush);

392 lua_pushvalue(L, 1);

393 lua_call(L, 1, 2);

394 if (!lua_toboolean(L, -2)) {

395 close(handle->fd);

396 handle->fd = -1;

397 return 2;

398 }

399 }

400 moonbr_io_handle_set_linger(L, handle, -1);

401 }

402 if (handle->fd >= 0) {

403 if (close(handle->fd)) {

404 moonbr_io_errmsg();

405 handle->fd = -1;

406 lua_pushnil(L);

407 lua_pushstring(L, errmsg);

408 return 2;

409 }

410 handle->fd = -1;

411 }

412 lua_pushboolean(L, 1);

413 return 1;

414

415 }

416

417 static int moonbr_io_close(lua_State *L) {

418 return moonbr_io_close_impl(L, 0);

419 }

420

421 static int moonbr_io_reset(lua_State *L) {

422 return moonbr_io_close_impl(L, 1);

423 }

424

425 static int moonbr_io_gc(lua_State *L) {

426 moonbr_io_handle_t *handle;

427 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

428 if (handle->fd >= 0) {

429 lua_pushcfunction(L, moonbr_io_close);

430 lua_pushvalue(L, 1);

431 lua_pushinteger(L, 0);

432 lua_call(L, 2, 0);

433 }

434 return 0;

435 }

436

437 void moonbr_io_closehandle(lua_State *L, int idx, int reset) {

438 moonbr_io_handle_t *handle;

439 handle = luaL_checkudata(L, idx, MOONBR_IO_HANDLE_MT_REGKEY);

440 if (!handle->closed) {

441 lua_pushcfunction(L, reset ? moonbr_io_reset : moonbr_io_close);

442 lua_pushvalue(L, idx < 0 ? idx-1 : idx);

443 lua_call(L, 1, 0);

444 }

445 }

446

447 void moonbr_io_pushhandle(lua_State *L, int fd, int isnetwork) {

448 moonbr_io_handle_t *handle;

449 handle = lua_newuserdata(L, sizeof(moonbr_io_handle_t));

450 handle->fd = fd;

451 handle->isnetwork = isnetwork;

452 handle->finished = 0;

453 handle->closed = 0;

454 handle->nonblocking = -1;

455 handle->nopush = -1;

456 handle->readerr = 0;

457 handle->readbufcnt = 0;

458 handle->writeerr = 0;

459 handle->writeleft = 0;

460 handle->writeqin = 0;

461 handle->writeqout = 0;

462 handle->writeqoff = 0;

463 handle->writebufin = 0;

464 handle->writebufout = 0;

465 moonbr_io_handle_set_linger(L, handle, 0);

466 luaL_getmetatable(L, MOONBR_IO_HANDLE_MT_REGKEY);

467 lua_setmetatable(L, -2);

468 lua_newtable(L); // uservalue

469 lua_newtable(L);

470 lua_setfield(L, -2, "writequeue");

471 lua_newtable(L); // public

472 luaL_getmetatable(L, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);

473 lua_setmetatable(L, -2);

474 lua_setfield(L, -2, "public");

475 lua_setuservalue(L, -2);

476 }

477

478 static int moonbr_io_handleindex(lua_State *L) {

479 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

480 lua_getuservalue(L, 1);

481 lua_getfield(L, -1, "public");

482 lua_pushvalue(L, 2);

483 lua_gettable(L, -2);

484 return 1;

485 }

486

487 static int moonbr_io_handlenewindex(lua_State *L) {

488 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

489 lua_getuservalue(L, 1);

490 lua_getfield(L, -1, "public");

491 lua_pushvalue(L, 2);

492 lua_pushvalue(L, 3);

493 lua_settable(L, -3);

494 return 0;

495 }

496

497 static int moonbr_io_tcpconnect_impl(lua_State *L, int nonblocking) {

498 const char *host, *port;

499 struct addrinfo hints = { 0, };

500 struct addrinfo *res, *addrinfo;

501 int errcode;

502 int sock;

503 host = luaL_checkstring(L, 1);

504 port = luaL_checkstring(L, 2);

505 hints.ai_family = AF_UNSPEC;

506 hints.ai_socktype = SOCK_STREAM;

507 hints.ai_protocol = IPPROTO_TCP;

508 hints.ai_flags = AI_ADDRCONFIG;

509 errcode = getaddrinfo(host, port, &hints, &res);

510 if (errcode) {

511 freeaddrinfo(res);

512 if (errcode == EAI_SYSTEM) {

513 moonbr_io_errmsg();

514 lua_pushnil(L);

515 lua_pushfstring(L, "%s: %s", gai_strerror(errcode), errmsg);

516 } else {

517 lua_pushnil(L);

518 lua_pushstring(L, gai_strerror(errcode));

519 }

520 return 2;

521 }

522 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {

523 if (addrinfo->ai_family == PF_INET6) goto moonbr_io_tcpconnect_found;

524 }

525 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {

526 if (addrinfo->ai_family == PF_INET) goto moonbr_io_tcpconnect_found;

527 }

528 addrinfo = res;

529 moonbr_io_tcpconnect_found:

530 sock = socket(

531 addrinfo->ai_family,

532 addrinfo->ai_socktype | SOCK_CLOEXEC | (nonblocking ? SOCK_NONBLOCK : 0),

533 addrinfo->ai_protocol

534 );

535 freeaddrinfo(res);

536 if (sock < 0) {

537 moonbr_io_errmsg();

538 lua_pushnil(L);

539 lua_pushstring(L, errmsg);

540 }

541 if (connect(sock, addrinfo->ai_addr, addrinfo->ai_addrlen)) {

542 if (!nonblocking && errno == EINTR) {

543 moonbr_io_errmsg();

544 close(sock);

545 lua_pushnil(L);

546 lua_pushstring(L, errmsg);

547 return 2;

548 } else if (!(nonblocking && (errno == EINPROGRESS || errno == EINTR))) {

549 moonbr_io_errmsg();

550 lua_pushnil(L);

551 lua_pushstring(L, errmsg);

552 return 2;

553 }

554 }

555 moonbr_io_pushhandle(L, sock, 1);

556 return 1;

557 }

558

559 static int moonbr_io_tcpconnect(lua_State *L) {

560 return moonbr_io_tcpconnect_impl(L, 0);

561 }

562

563 static int moonbr_io_tcpconnect_nb(lua_State *L) {

564 return moonbr_io_tcpconnect_impl(L, 1);

565 }

566

567 static const struct luaL_Reg moonbr_io_handle_methods[] = {

568 {"read", moonbr_io_read},

569 {"read_nb", moonbr_io_read_nb},

570 {"drain", moonbr_io_drain},

571 {"drain_nb", moonbr_io_drain_nb},

572 {"write", moonbr_io_write},

573 {"write_nb", moonbr_io_write_nb},

574 {"flush", moonbr_io_flush},

575 {"flush_nb", moonbr_io_flush_nb},

576 {"finish", moonbr_io_finish},

577 {"close", moonbr_io_close},

578 {"reset", moonbr_io_reset},

579 {NULL, NULL}

580 };

581

582 static const struct luaL_Reg moonbr_io_handle_metamethods[] = {

583 {"__index", moonbr_io_handleindex},

584 {"__newindex", moonbr_io_handlenewindex},

585 {"__gc", moonbr_io_gc},

586 {NULL, NULL}

587 };

588

589 static const struct luaL_Reg moonbr_io_module_funcs[] = {

590 {"tcpconnect", moonbr_io_tcpconnect},

591 {"tcpconnect_nb", moonbr_io_tcpconnect_nb},

592 {NULL, NULL}

593 };

594

595 int luaopen_moonbridge_io(lua_State *L) {

596

597 lua_newtable(L); // module

598

599 lua_newtable(L); // public metatable

600 lua_newtable(L); // handle methods

601 luaL_setfuncs(L, moonbr_io_handle_methods, 0);

602 lua_pushvalue(L, -1);

603 lua_setfield(L, -4, "handle");

604 lua_setfield(L, -2, "__index");

605 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);

606

607 lua_newtable(L); // handle metatable

608 luaL_setfuncs(L, moonbr_io_handle_metamethods, 0);

609 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_MT_REGKEY);

610

611 luaL_setfuncs(L, moonbr_io_module_funcs, 0);

612 return 1;

613

614 }

615