moonbridge: 0561abcc68ee moonbridge

moonbridge

view moonbridge_io.c @ 97:0561abcc68ee

Bugfix regarding TCP PSH

author	jbe
date	Wed Apr 08 01:35:06 2015 +0200 (2015-04-08)
parents	fdc1bb710544
children	acaa85256c4b

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, 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 moonbr_io_handle_set_nopush(L, handle, 0);

287 written = 0;

288 while (written < handle->writebufcnt) {

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

290 if (result < 0) {

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

292 if (written) {

293 handle->writebufcnt -= written;

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

295 }

296 goto moonbr_io_write_impl_block;

297 } else if (errno != EINTR) {

298 moonbr_io_errmsg();

299 handle->writeerr = -1;

300 lua_pushnil(L);

301 lua_pushstring(L, errmsg);

302 return 2;

303 }

304 } else {

305 written += result;

306 handle->writeleft -= result;

307 }

308 }

309 handle->writebufcnt = 0;

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

311 } else {

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

313 }

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

315 return 1;

316 moonbr_io_write_impl_block:

317 lua_pushinteger(L, handle->writeleft);

318 return 1;

319 }

320

321 static int moonbr_io_write(lua_State *L) {

322 return moonbr_io_write_impl(L, 0, 0);

323 }

324

325 static int moonbr_io_write_nb(lua_State *L) {

326 return moonbr_io_write_impl(L, 1, 0);

327 }

328

329 static int moonbr_io_flush(lua_State *L) {

330 return moonbr_io_write_impl(L, 0, 1);

331 }

332

333 static int moonbr_io_flush_nb(lua_State *L) {

334 return moonbr_io_write_impl(L, 1, 1);

335 }

336

337 static int moonbr_io_finish(lua_State *L) {

338 moonbr_io_handle_t *handle;

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

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

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

342 if (handle->writeleft) {

343 lua_pushcfunction(L, moonbr_io_flush);

344 lua_pushvalue(L, 1);

345 lua_call(L, 1, 2);

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

347 handle->finished = 1;

348 return 2;

349 }

350 }

351 handle->finished = 1;

352 if (handle->isnetwork) {

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

354 moonbr_io_errmsg();

355 lua_pushnil(L);

356 lua_pushstring(L, errmsg);

357 return 2;

358 }

359 } else {

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

361 moonbr_io_errmsg();

362 handle->fd = -1;

363 lua_pushnil(L);

364 lua_pushstring(L, errmsg);

365 return 2;

366 }

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

368 }

369 lua_pushboolean(L, 1);

370 return 1;

371 }

372

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

374 moonbr_io_handle_t *handle;

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

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

377 if (!reset) {

378 if (handle->writeleft) {

379 lua_pushcfunction(L, moonbr_io_flush);

380 lua_pushvalue(L, 1);

381 lua_call(L, 1, 2);

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

383 close(handle->fd);

384 handle->fd = -1;

385 return 2;

386 }

387 }

388 moonbr_io_handle_set_linger(L, handle, -1);

389 }

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

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

392 moonbr_io_errmsg();

393 handle->fd = -1;

394 lua_pushnil(L);

395 lua_pushstring(L, errmsg);

396 return 2;

397 }

398 }

399 handle->fd = -1;

400 lua_pushboolean(L, 1);

401 return 1;

402

403 }

404

405 static int moonbr_io_close(lua_State *L) {

406 return moonbr_io_close_impl(L, 0);

407 }

408

409 static int moonbr_io_reset(lua_State *L) {

410 return moonbr_io_close_impl(L, 1);

411 }

412

413 static int moonbr_io_gc(lua_State *L) {

414 moonbr_io_handle_t *handle;

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

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

417 lua_pushcfunction(L, moonbr_io_close);

418 lua_pushvalue(L, 1);

419 lua_pushinteger(L, 0);

420 lua_call(L, 2, 0);

421 }

422 return 0;

423 }

424

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

426 moonbr_io_handle_t *handle;

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

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

429 lua_pushcfunction(L, moonbr_io_close);

430 lua_pushvalue(L, idx);

431 lua_pushinteger(L, timeout);

432 lua_call(L, 2, 0);

433 }

434 }

435

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

437 moonbr_io_handle_t *handle;

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

439 handle->fd = fd;

440 handle->isnetwork = isnetwork;

441 handle->finished = 0;

442 handle->closed = 0;

443 handle->nonblocking = -1;

444 handle->nopush = -1;

445 handle->readerr = 0;

446 handle->readbufcnt = 0;

447 handle->writeerr = 0;

448 handle->writeleft = 0;

449 handle->writeqin = 0;

450 handle->writeqout = 0;

451 handle->writeqoff = 0;

452 handle->writebufcnt = 0;

453 moonbr_io_handle_set_linger(L, handle, 0);

454 luaL_getmetatable(L, MOONBR_IO_HANDLE_MT_REGKEY);

455 lua_setmetatable(L, -2);

456 lua_newtable(L); // uservalue

457 lua_newtable(L);

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

459 lua_newtable(L); // public

460 luaL_getmetatable(L, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);

461 lua_setmetatable(L, -2);

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

463 lua_setuservalue(L, -2);

464 }

465

466 static int moonbr_io_handleindex(lua_State *L) {

467 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

468 lua_getuservalue(L, 1);

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

470 lua_pushvalue(L, 2);

471 lua_gettable(L, -2);

472 return 1;

473 }

474

475 static int moonbr_io_handlenewindex(lua_State *L) {

476 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

477 lua_getuservalue(L, 1);

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

479 lua_pushvalue(L, 2);

480 lua_pushvalue(L, 3);

481 lua_settable(L, -3);

482 return 0;

483 }

484

485 static const struct luaL_Reg moonbr_io_handle_methods[] = {

486 {"read", moonbr_io_read},

487 {"read_nb", moonbr_io_read_nb},

488 {"drain", moonbr_io_drain},

489 {"drain_nb", moonbr_io_drain_nb},

490 {"write", moonbr_io_write},

491 {"write_nb", moonbr_io_write_nb},

492 {"flush", moonbr_io_flush},

493 {"flush_nb", moonbr_io_flush_nb},

494 {"finish", moonbr_io_finish},

495 {"close", moonbr_io_close},

496 {"reset", moonbr_io_reset},

497 {NULL, NULL}

498 };

499

500 static const struct luaL_Reg moonbr_io_handle_metamethods[] = {

501 {"__index", moonbr_io_handleindex},

502 {"__newindex", moonbr_io_handlenewindex},

503 {"__gc", moonbr_io_gc},

504 {NULL, NULL}

505 };

506

507 static const struct luaL_Reg moonbr_io_module_funcs[] = {

508 {NULL, NULL}

509 };

510

511 int luaopen_moonbridge_io(lua_State *L) {

512

513 lua_newtable(L); // module

514

515 lua_newtable(L); // public metatable

516 lua_newtable(L); // handle methods

517 luaL_setfuncs(L, moonbr_io_handle_methods, 0);

518 lua_pushvalue(L, -1);

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

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

521 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);

522

523 lua_newtable(L); // handle metatable

524 luaL_setfuncs(L, moonbr_io_handle_metamethods, 0);

525 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_MT_REGKEY);

526

527 luaL_setfuncs(L, moonbr_io_module_funcs, 0);

528 return 1;

529

530 }

531