moonbridge: fdc1bb710544 moonbridge

moonbridge

view moonbridge_io.c @ 96:fdc1bb710544

Allow full write buffer without forcing TCP PSH

author	jbe
date	Wed Apr 08 01:22:20 2015 +0200 (2015-04-08)
parents	719f83c7fea4
children	0561abcc68ee

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>

13 #include <lua.h>

14 #include <lauxlib.h>

15 #include <lualib.h>

17 #define MOONBR_IO_MAXSTRERRORLEN 80

18 #define MOONBR_IO_READBUFLEN 4096

19 #define MOONBR_IO_WRITEBUFLEN 4096

21 #define moonbr_io_errmsg() \

22 char errmsg[MOONBR_IO_MAXSTRERRORLEN]; \

23 strerror_r(errno, errmsg, MOONBR_IO_MAXSTRERRORLEN)

25 #define MOONBR_IO_HANDLE_MT_REGKEY "moonbridge_io_handle"

26 #define MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY "moonbridge_io_handle_public"

28 typedef struct {

29 int fd;

30 int isnetwork;

31 int finished;

32 int closed;

33 int nonblocking;

34 int nopush;

35 int readerr;

36 int readbufcnt;

37 int writeerr;

38 size_t writeleft;

39 #if LUA_VERSION_NUM >= 503

40 lua_Integer writeqin;

41 lua_Integer writeqout;

42 #else

43 int writeqin;

44 int writeqout;

45 #endif

46 size_t writeqoff;

47 int writebufcnt;

48 char readbuf[MOONBR_IO_READBUFLEN];

49 char writebuf[MOONBR_IO_WRITEBUFLEN];

50 } moonbr_io_handle_t;

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

53 int flags;

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

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

56 if (flags == -1) {

57 moonbr_io_errmsg();

58 close(handle->fd);

59 handle->fd = -1;

60 handle->closed = 1;

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

62 }

63 if (nonblocking) flags |= O_NONBLOCK;

64 else flags &= ~O_NONBLOCK;

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

66 moonbr_io_errmsg();

67 close(handle->fd);

68 handle->fd = -1;

69 handle->closed = 1;

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

71 }

72 handle->nonblocking = nonblocking;

73 }

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

76 struct linger lingerval = { 0, };

77 if (!handle->isnetwork) return;

78 if (timeout >= 0) {

79 lingerval.l_onoff = 1;

80 lingerval.l_linger = timeout;

81 }

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

83 moonbr_io_errmsg();

84 close(handle->fd);

85 handle->fd = -1;

86 handle->closed = 1;

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

88 }

89 }

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

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

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

94 #if defined(TCP_NOPUSH)

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

96 moonbr_io_errmsg();

97 close(handle->fd);

98 handle->fd = -1;

99 handle->closed = 1;

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

101 }

102 #elif defined(TCP_CORK)

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

104 moonbr_io_errmsg();

105 close(handle->fd);

106 handle->fd = -1;

107 handle->closed = 1;

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

109 }

110 #endif

111 handle->nopush = nopush;

112 #else

113 #warning Neither TCP_NOPUSH nor TCP_CORK is available

114 #endif

115 }

116

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

118 moonbr_io_handle_t *handle;

119 lua_Integer maxread;

120 const char *terminatorstr;

121 size_t terminatorlen;

122 char terminator;

123 luaL_Buffer luabuf;

124 size_t luabufcnt = 0;

125 int endcnt;

126 char *terminatorpos;

127 ssize_t result;

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

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

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

131 if (terminatorlen) {

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

133 terminator = terminatorstr[0];

134 }

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

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

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

138 if (handle->readerr) {

139 lua_pushnil(L);

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

141 return 2;

142 }

143 moonbr_io_handle_set_nonblocking(L, handle, nonblocking);

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

145 while (1) {

146 endcnt = -1;

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

148 endcnt = maxread - luabufcnt;

149 } else if (terminatorlen) {

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

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

152 }

153 if (endcnt >= 0) {

154 if (!drain) {

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

156 luaL_pushresult(&luabuf);

157 } else {

158 luabufcnt += handle->readbufcnt;

159 lua_pushinteger(L, luabufcnt);

160 }

161 handle->readbufcnt -= endcnt;

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

163 return 1;

164 }

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

166 luabufcnt += handle->readbufcnt;

167 handle->readbufcnt = 0;

168 do {

169 result = read(handle->fd, handle->readbuf, MOONBR_IO_READBUFLEN);

170 } while (result < 0 && (errno == EINTR));

171 if (result == 0 || (nonblocking && result < 0 && (errno == EAGAIN || errno == EWOULDBLOCK))) break;

172 if (result < 0) {

173 moonbr_io_errmsg();

174 handle->readerr = 1;

175 lua_pushnil(L);

176 lua_pushstring(L, errmsg);

177 return 2;

178 }

179 handle->readbufcnt += result;

180 }

181 if (!drain) {

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

183 luaL_pushresult(&luabuf);

184 }

185 luabufcnt += handle->readbufcnt;

186 handle->readbufcnt = 0;

187 if (!drain) {

188 if (!luabufcnt && result == 0) {

189 moonbr_io_read_impl_eof:

190 lua_pushboolean(L, 0);

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

192 return 2;

193 }

194 } else {

195 if (!luabufcnt && result == 0) lua_pushboolean(L, 1);

196 else lua_pushboolean(L, luabufcnt);

197 }

198 return 1;

199 }

200

201 static int moonbr_io_read(lua_State *L) {

202 return moonbr_io_read_impl(L, 0, 0);

203 }

204

205 static int moonbr_io_read_nb(lua_State *L) {

206 return moonbr_io_read_impl(L, 1, 0);

207 }

208

209 static int moonbr_io_drain(lua_State *L) {

210 return moonbr_io_read_impl(L, 0, 1);

211 }

212

213 static int moonbr_io_drain_nb(lua_State *L) {

214 return moonbr_io_read_impl(L, 1, 1);

215 }

216

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

218 moonbr_io_handle_t *handle;

219 int i, top;

220 const char *str;

221 size_t strlen;

222 size_t written;

223 ssize_t result;

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

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

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

227 if (handle->writeerr) {

228 lua_pushnil(L);

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

230 return 2;

231 }

232 moonbr_io_handle_set_nonblocking(L, handle, nonblocking);

233 top = lua_gettop(L);

234 lua_getuservalue(L, 1);

235 lua_getfield(L, -1, "writebuf");

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

237 luaL_checklstring(L, i, &strlen);

238 lua_pushvalue(L, i);

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

240 handle->writeleft += strlen;

241 }

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

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

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

245 while (handle->writeqoff < strlen) {

246 if (strlen - handle->writeqoff <= MOONBR_IO_WRITEBUFLEN - handle->writebufcnt) {

247 memcpy(handle->writebuf + handle->writebufcnt, str + handle->writeqoff, strlen - handle->writeqoff);

248 handle->writebufcnt += strlen - handle->writeqoff;

249 break;

250 } else {

251 moonbr_io_handle_set_nopush(L, handle, flush ? 0 : 1);

252 written = 0;

253 memcpy(handle->writebuf + handle->writebufcnt, str + handle->writeqoff, MOONBR_IO_WRITEBUFLEN - handle->writebufcnt);

254 handle->writeqoff += MOONBR_IO_WRITEBUFLEN - handle->writebufcnt;

255 while (written < MOONBR_IO_WRITEBUFLEN) {

256 result = write(handle->fd, handle->writebuf + written, MOONBR_IO_WRITEBUFLEN - written);

257 if (result < 0) {

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

259 if (written) {

260 handle->writebufcnt -= written;

261 memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);

262 goto moonbr_io_write_impl_continue;

263 }

264 goto moonbr_io_write_impl_block;

265 } else if (errno != EINTR) {

266 moonbr_io_errmsg();

267 handle->writeerr = 1;

268 lua_pushnil(L);

269 lua_pushstring(L, errmsg);

270 return 2;

271 }

272 }

273 written += result;

274 handle->writeleft -= result;

275 }

276 handle->writebufcnt = 0;

277 }

278 moonbr_io_write_impl_continue:;

279 }

280 handle->writeqoff = 0;

281 lua_pop(L, 1);

282 lua_pushnil(L);

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

284 }

285 if (flush) {

286 written = 0;

287 while (written < handle->writebufcnt) {

288 result = write(handle->fd, handle->writebuf + written, handle->writebufcnt - written);

289 if (result < 0) {

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

291 if (written) {

292 handle->writebufcnt -= written;

293 memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);

294 }

295 goto moonbr_io_write_impl_block;

296 } else if (errno != EINTR) {

297 moonbr_io_errmsg();

298 handle->writeerr = -1;

299 lua_pushnil(L);

300 lua_pushstring(L, errmsg);

301 return 2;

302 }

303 } else {

304 written += result;

305 handle->writeleft -= result;

306 }

307 }

308 handle->writebufcnt = 0;

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

310 } else {

311 if (nonblocking) lua_pushinteger(L, handle->writeleft);

312 }

313 if (!nonblocking) lua_pushvalue(L, 1);

314 return 1;

315 moonbr_io_write_impl_block:

316 lua_pushinteger(L, handle->writeleft);

317 return 1;

318 }

319

320 static int moonbr_io_write(lua_State *L) {

321 return moonbr_io_write_impl(L, 0, 0);

322 }

323

324 static int moonbr_io_write_nb(lua_State *L) {

325 return moonbr_io_write_impl(L, 1, 0);

326 }

327

328 static int moonbr_io_flush(lua_State *L) {

329 return moonbr_io_write_impl(L, 0, 1);

330 }

331

332 static int moonbr_io_flush_nb(lua_State *L) {

333 return moonbr_io_write_impl(L, 1, 1);

334 }

335

336 static int moonbr_io_finish(lua_State *L) {

337 moonbr_io_handle_t *handle;

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

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

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

341 if (handle->writeleft) {

342 lua_pushcfunction(L, moonbr_io_flush);

343 lua_pushvalue(L, 1);

344 lua_call(L, 1, 2);

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

346 handle->finished = 1;

347 return 2;

348 }

349 }

350 handle->finished = 1;

351 if (handle->isnetwork) {

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

353 moonbr_io_errmsg();

354 lua_pushnil(L);

355 lua_pushstring(L, errmsg);

356 return 2;

357 }

358 } else {

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

360 moonbr_io_errmsg();

361 handle->fd = -1;

362 lua_pushnil(L);

363 lua_pushstring(L, errmsg);

364 return 2;

365 }

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

367 }

368 lua_pushboolean(L, 1);

369 return 1;

370 }

371

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

373 moonbr_io_handle_t *handle;

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

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

376 if (!reset) {

377 if (handle->writeleft) {

378 lua_pushcfunction(L, moonbr_io_flush);

379 lua_pushvalue(L, 1);

380 lua_call(L, 1, 2);

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

382 close(handle->fd);

383 handle->fd = -1;

384 return 2;

385 }

386 }

387 moonbr_io_handle_set_linger(L, handle, -1);

388 }

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

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

391 moonbr_io_errmsg();

392 handle->fd = -1;

393 lua_pushnil(L);

394 lua_pushstring(L, errmsg);

395 return 2;

396 }

397 }

398 handle->fd = -1;

399 lua_pushboolean(L, 1);

400 return 1;

401

402 }

403

404 static int moonbr_io_close(lua_State *L) {

405 return moonbr_io_close_impl(L, 0);

406 }

407

408 static int moonbr_io_reset(lua_State *L) {

409 return moonbr_io_close_impl(L, 1);

410 }

411

412 static int moonbr_io_gc(lua_State *L) {

413 moonbr_io_handle_t *handle;

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

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

416 lua_pushcfunction(L, moonbr_io_close);

417 lua_pushvalue(L, 1);

418 lua_pushinteger(L, 0);

419 lua_call(L, 2, 0);

420 }

421 return 0;

422 }

423

424 void moonbr_io_closehandle(lua_State *L, int idx, int timeout) {

425 moonbr_io_handle_t *handle;

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

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

428 lua_pushcfunction(L, moonbr_io_close);

429 lua_pushvalue(L, idx);

430 lua_pushinteger(L, timeout);

431 lua_call(L, 2, 0);

432 }

433 }

434

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

436 moonbr_io_handle_t *handle;

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

438 handle->fd = fd;

439 handle->isnetwork = isnetwork;

440 handle->finished = 0;

441 handle->closed = 0;

442 handle->nonblocking = -1;

443 handle->nopush = -1;

444 handle->readerr = 0;

445 handle->readbufcnt = 0;

446 handle->writeerr = 0;

447 handle->writeleft = 0;

448 handle->writeqin = 0;

449 handle->writeqout = 0;

450 handle->writeqoff = 0;

451 handle->writebufcnt = 0;

452 moonbr_io_handle_set_linger(L, handle, 0);

453 luaL_getmetatable(L, MOONBR_IO_HANDLE_MT_REGKEY);

454 lua_setmetatable(L, -2);

455 lua_newtable(L); // uservalue

456 lua_newtable(L);

457 lua_setfield(L, -2, "writebuf");

458 lua_newtable(L); // public

459 luaL_getmetatable(L, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);

460 lua_setmetatable(L, -2);

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

462 lua_setuservalue(L, -2);

463 }

464

465 static int moonbr_io_handleindex(lua_State *L) {

466 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

467 lua_getuservalue(L, 1);

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

469 lua_pushvalue(L, 2);

470 lua_gettable(L, -2);

471 return 1;

472 }

473

474 static int moonbr_io_handlenewindex(lua_State *L) {

475 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

476 lua_getuservalue(L, 1);

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

478 lua_pushvalue(L, 2);

479 lua_pushvalue(L, 3);

480 lua_settable(L, -3);

481 return 0;

482 }

483

484 static const struct luaL_Reg moonbr_io_handle_methods[] = {

485 {"read", moonbr_io_read},

486 {"read_nb", moonbr_io_read_nb},

487 {"drain", moonbr_io_drain},

488 {"drain_nb", moonbr_io_drain_nb},

489 {"write", moonbr_io_write},

490 {"write_nb", moonbr_io_write_nb},

491 {"flush", moonbr_io_flush},

492 {"flush_nb", moonbr_io_flush_nb},

493 {"finish", moonbr_io_finish},

494 {"close", moonbr_io_close},

495 {"reset", moonbr_io_reset},

496 {NULL, NULL}

497 };

498

499 static const struct luaL_Reg moonbr_io_handle_metamethods[] = {

500 {"__index", moonbr_io_handleindex},

501 {"__newindex", moonbr_io_handlenewindex},

502 {"__gc", moonbr_io_gc},

503 {NULL, NULL}

504 };

505

506 static const struct luaL_Reg moonbr_io_module_funcs[] = {

507 {NULL, NULL}

508 };

509

510 int luaopen_moonbridge_io(lua_State *L) {

511

512 lua_newtable(L); // module

513

514 lua_newtable(L); // public metatable

515 lua_newtable(L); // handle methods

516 luaL_setfuncs(L, moonbr_io_handle_methods, 0);

517 lua_pushvalue(L, -1);

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

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

520 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);

521

522 lua_newtable(L); // handle metatable

523 luaL_setfuncs(L, moonbr_io_handle_metamethods, 0);

524 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_MT_REGKEY);

525

526 luaL_setfuncs(L, moonbr_io_module_funcs, 0);

527 return 1;

528

529 }

530