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annotate src/c/request.c @ 1131:94e83c5533d2

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Handling errors during commit
author Adam Chlipala <adamc@hcoop.net>
date Tue, 26 Jan 2010 14:59:19 -0500
parents 150465f2895c
children b08b73591d2c
rev   line source
adamc@853 1 #define _GNU_SOURCE
adamc@853 2
adamc@853 3 #include <stdio.h>
adamc@853 4 #include <string.h>
adamc@853 5 #include <stdlib.h>
adamc@853 6 #include <sys/types.h>
adamc@853 7 #include <sys/socket.h>
adamc@853 8 #include <netinet/in.h>
adamc@853 9 #include <unistd.h>
adamc@853 10 #include <signal.h>
adamc@853 11
adamc@853 12 #include <pthread.h>
adamc@853 13
adamc@853 14 #include <mhash.h>
adamc@853 15
adamc@853 16 #include "urweb.h"
adamc@853 17
adamc@853 18 #define MAX_RETRIES 5
adamc@853 19
adamc@856 20 static int try_rollback(uw_context ctx, void *logger_data, uw_logger log_error) {
adamc@853 21 int r = uw_rollback(ctx);
adamc@853 22
adamc@853 23 if (r) {
adamc@856 24 log_error(logger_data, "Error running SQL ROLLBACK\n");
adamc@853 25 uw_reset(ctx);
adamc@1115 26 uw_write(ctx, "HTTP/1.1 500 Internal Server Error\r\n");
adamc@853 27 uw_write(ctx, "Content-type: text/plain\r\n\r\n");
adamc@853 28 uw_write(ctx, "Error running SQL ROLLBACK\n");
adamc@1115 29 uw_set_error_message(ctx, "Database error; you are probably out of storage space.");
adamc@853 30 }
adamc@853 31
adamc@853 32 return r;
adamc@853 33 }
adamc@853 34
adamc@1094 35 uw_context uw_request_new_context(uw_app *app, void *logger_data, uw_logger log_error, uw_logger log_debug) {
adamc@853 36 uw_context ctx = uw_init();
adamc@853 37 int retries_left = MAX_RETRIES;
adamc@1094 38 uw_set_app(ctx, app);
adamc@853 39
adamc@853 40 while (1) {
adamc@853 41 failure_kind fk = uw_begin_init(ctx);
adamc@853 42
adamc@853 43 if (fk == SUCCESS) {
adamc@856 44 log_debug(logger_data, "Database connection initialized.\n");
adamc@853 45 break;
adamc@853 46 } else if (fk == BOUNDED_RETRY) {
adamc@853 47 if (retries_left) {
adamc@856 48 log_debug(logger_data, "Initialization error triggers bounded retry: %s\n", uw_error_message(ctx));
adamc@853 49 --retries_left;
adamc@853 50 } else {
adamc@856 51 log_error(logger_data, "Fatal initialization error (out of retries): %s\n", uw_error_message(ctx));
adamc@853 52 uw_free(ctx);
adamc@853 53 return NULL;
adamc@853 54 }
adamc@853 55 } else if (fk == UNLIMITED_RETRY)
adamc@856 56 log_debug(logger_data, "Initialization error triggers unlimited retry: %s\n", uw_error_message(ctx));
adamc@853 57 else if (fk == FATAL) {
adamc@856 58 log_error(logger_data, "Fatal initialization error: %s\n", uw_error_message(ctx));
adamc@853 59 uw_free(ctx);
adamc@853 60 return NULL;
adamc@853 61 } else {
adamc@856 62 log_error(logger_data, "Unknown uw_begin_init return code!\n");
adamc@853 63 uw_free(ctx);
adamc@853 64 return NULL;
adamc@853 65 }
adamc@853 66 }
adamc@853 67
adamc@853 68 return ctx;
adamc@853 69 }
adamc@853 70
adamc@1094 71 void uw_request_init(uw_app *app, void *logger_data, uw_logger log_error, uw_logger log_debug) {
adamc@853 72 uw_context ctx;
adamc@853 73 failure_kind fk;
adamc@853 74
adamc@853 75 uw_global_init();
adamc@1094 76 uw_app_init(app);
adamc@853 77
adamc@1094 78 ctx = uw_request_new_context(app, logger_data, log_error, log_debug);
adamc@853 79
adamc@853 80 if (!ctx)
adamc@853 81 exit(1);
adamc@853 82
adamc@853 83 for (fk = uw_initialize(ctx); fk == UNLIMITED_RETRY; fk = uw_initialize(ctx)) {
adamc@856 84 log_debug(logger_data, "Unlimited retry during init: %s\n", uw_error_message(ctx));
adamc@1094 85 uw_rollback(ctx);
adamc@853 86 uw_reset(ctx);
adamc@853 87 }
adamc@853 88
adamc@853 89 if (fk != SUCCESS) {
adamc@856 90 log_error(logger_data, "Failed to initialize database! %s\n", uw_error_message(ctx));
adamc@1094 91 uw_rollback(ctx);
adamc@853 92 exit(1);
adamc@853 93 }
adamc@853 94
adamc@853 95 uw_free(ctx);
adamc@853 96 }
adamc@853 97
adamc@853 98
adamc@853 99 typedef struct uw_rc {
adamc@853 100 size_t path_copy_size;
adamc@853 101 char *path_copy;
adamc@853 102 } *uw_request_context;
adamc@853 103
adamc@853 104 uw_request_context uw_new_request_context(void) {
adamc@853 105 uw_request_context r = malloc(sizeof(struct uw_rc));
adamc@853 106 r->path_copy_size = 0;
adamc@853 107 r->path_copy = malloc(0);
adamc@853 108 return r;
adamc@853 109 }
adamc@853 110
adamc@853 111 void uw_free_request_context(uw_request_context r) {
adamc@853 112 free(r->path_copy);
adamc@853 113 free(r);
adamc@853 114 }
adamc@853 115
adamc@854 116 request_result uw_request(uw_request_context rc, uw_context ctx,
adamc@854 117 char *method, char *path, char *query_string,
adamc@854 118 char *body, size_t body_len,
adamc@856 119 void (*on_success)(uw_context), void (*on_failure)(uw_context),
adamc@856 120 void *logger_data, uw_logger log_error, uw_logger log_debug,
adamc@863 121 int sock,
adamc@863 122 int (*send)(int sockfd, const void *buf, size_t len),
adamc@863 123 int (*close)(int fd)) {
adamc@853 124 int retries_left = MAX_RETRIES;
adamc@853 125 char *s;
adamc@853 126 failure_kind fk;
adamc@853 127 int is_post = 0, do_normal_send = 1;
adamc@853 128 char *boundary = NULL;
adamc@853 129 size_t boundary_len;
adamc@854 130 char *inputs;
adamc@1094 131 const char *prefix = uw_get_url_prefix(ctx);
adamc@853 132
adamc@1066 133 uw_set_currentUrl(ctx, path);
adamc@1066 134
adamc@854 135 if (!strcmp(method, "POST")) {
adamc@853 136 char *clen_s = uw_Basis_requestHeader(ctx, "Content-length");
adamc@853 137 if (!clen_s) {
adamc@1037 138 clen_s = "0";
adamc@1037 139 /*log_error(logger_data, "No Content-length with POST\n");
adamc@1037 140 return FAILED;*/
adamc@853 141 }
adamc@853 142 int clen = atoi(clen_s);
adamc@853 143 if (clen < 0) {
adamc@856 144 log_error(logger_data, "Negative Content-length with POST\n");
adamc@853 145 return FAILED;
adamc@853 146 }
adamc@853 147
adamc@854 148 if (body_len < clen) {
adamc@856 149 log_error(logger_data, "Request doesn't contain all POST data (according to Content-Length)\n");
adamc@853 150 return FAILED;
adamc@853 151 }
adamc@853 152
adamc@853 153 is_post = 1;
adamc@853 154
adamc@853 155 clen_s = uw_Basis_requestHeader(ctx, "Content-type");
adamc@853 156 if (clen_s && !strncasecmp(clen_s, "multipart/form-data", 19)) {
adamc@853 157 if (strncasecmp(clen_s + 19, "; boundary=", 11)) {
adamc@856 158 log_error(logger_data, "Bad multipart boundary spec");
adamc@853 159 return FAILED;
adamc@853 160 }
adamc@853 161
adamc@853 162 boundary = clen_s + 28;
adamc@853 163 boundary[0] = '-';
adamc@853 164 boundary[1] = '-';
adamc@853 165 boundary_len = strlen(boundary);
adamc@853 166 }
adamc@854 167 } else if (strcmp(method, "GET")) {
adamc@856 168 log_error(logger_data, "Not ready for non-GET/POST command: %s\n", method);
adamc@853 169 return FAILED;
adamc@853 170 }
adamc@853 171
adamc@1094 172 if (!strncmp(path, prefix, strlen(prefix))
adamc@1094 173 && !strcmp(path + strlen(prefix), ".msgs")) {
adamc@853 174 char *id = uw_Basis_requestHeader(ctx, "UrWeb-Client");
adamc@853 175 char *pass = uw_Basis_requestHeader(ctx, "UrWeb-Pass");
adamc@853 176
adamc@853 177 if (sock < 0) {
adamc@856 178 log_error(logger_data, ".msgs requested, but not socket supplied\n");
adamc@853 179 return FAILED;
adamc@853 180 }
adamc@853 181
adamc@853 182 if (id && pass) {
adamc@853 183 unsigned idn = atoi(id);
adamc@864 184 uw_client_connect(idn, atoi(pass), sock, send, close, logger_data, log_error);
adamc@856 185 log_error(logger_data, "Processed request for messages by client %u\n\n", idn);
adamc@853 186 return KEEP_OPEN;
adamc@853 187 }
adamc@853 188 else {
adamc@856 189 log_error(logger_data, "Missing fields in .msgs request: %s, %s\n\n", id, pass);
adamc@853 190 return FAILED;
adamc@853 191 }
adamc@853 192 }
adamc@853 193
adamc@853 194 if (boundary) {
adamc@854 195 char *part = body, *after_sub_headers, *header, *after_header;
adamc@853 196 size_t part_len;
adamc@853 197
adamc@853 198 part = strstr(part, boundary);
adamc@853 199 if (!part) {
adamc@856 200 log_error(logger_data, "Missing first multipart boundary\n");
adamc@853 201 return FAILED;
adamc@853 202 }
adamc@853 203 part += boundary_len;
adamc@853 204
adamc@853 205 while (1) {
adamc@853 206 char *name = NULL, *filename = NULL, *type = NULL;
adamc@853 207
adamc@853 208 if (part[0] == '-' && part[1] == '-')
adamc@853 209 break;
adamc@853 210
adamc@853 211 if (*part != '\r') {
adamc@856 212 log_error(logger_data, "No \\r after multipart boundary\n");
adamc@853 213 return FAILED;
adamc@853 214 }
adamc@853 215 ++part;
adamc@853 216 if (*part != '\n') {
adamc@856 217 log_error(logger_data, "No \\n after multipart boundary\n");
adamc@853 218 return FAILED;
adamc@853 219 }
adamc@853 220 ++part;
adamc@853 221
adamc@853 222 if (!(after_sub_headers = strstr(part, "\r\n\r\n"))) {
adamc@856 223 log_error(logger_data, "Missing end of headers after multipart boundary\n");
adamc@853 224 return FAILED;
adamc@853 225 }
adamc@853 226 after_sub_headers[2] = 0;
adamc@853 227 after_sub_headers += 4;
adamc@853 228
adamc@853 229 for (header = part; after_header = strstr(header, "\r\n"); header = after_header + 2) {
adamc@853 230 char *colon, *after_colon;
adamc@853 231
adamc@853 232 *after_header = 0;
adamc@853 233 if (!(colon = strchr(header, ':'))) {
adamc@856 234 log_error(logger_data, "Missing colon in multipart sub-header\n");
adamc@853 235 return FAILED;
adamc@853 236 }
adamc@853 237 *colon++ = 0;
adamc@853 238 if (*colon++ != ' ') {
adamc@856 239 log_error(logger_data, "No space after colon in multipart sub-header\n");
adamc@853 240 return FAILED;
adamc@853 241 }
adamc@853 242
adamc@853 243 if (!strcasecmp(header, "Content-Disposition")) {
adamc@853 244 if (strncmp(colon, "form-data; ", 11)) {
adamc@856 245 log_error(logger_data, "Multipart data is not \"form-data\"\n");
adamc@853 246 return FAILED;
adamc@853 247 }
adamc@853 248
adamc@853 249 for (colon += 11; after_colon = strchr(colon, '='); colon = after_colon) {
adamc@853 250 char *data;
adamc@853 251 after_colon[0] = 0;
adamc@853 252 if (after_colon[1] != '"') {
adamc@856 253 log_error(logger_data, "Disposition setting is missing initial quote\n");
adamc@853 254 return FAILED;
adamc@853 255 }
adamc@853 256 data = after_colon+2;
adamc@853 257 if (!(after_colon = strchr(data, '"'))) {
adamc@856 258 log_error(logger_data, "Disposition setting is missing final quote\n");
adamc@853 259 return FAILED;
adamc@853 260 }
adamc@853 261 after_colon[0] = 0;
adamc@853 262 ++after_colon;
adamc@853 263 if (after_colon[0] == ';' && after_colon[1] == ' ')
adamc@853 264 after_colon += 2;
adamc@853 265
adamc@853 266 if (!strcasecmp(colon, "name"))
adamc@853 267 name = data;
adamc@853 268 else if (!strcasecmp(colon, "filename"))
adamc@853 269 filename = data;
adamc@853 270 }
adamc@853 271 } else if (!strcasecmp(header, "Content-Type")) {
adamc@853 272 type = colon;
adamc@853 273 }
adamc@853 274 }
adamc@853 275
adamc@854 276 part = memmem(after_sub_headers, body + body_len - after_sub_headers, boundary, boundary_len);
adamc@853 277 if (!part) {
adamc@856 278 log_error(logger_data, "Missing boundary after multipart payload\n");
adamc@853 279 return FAILED;
adamc@853 280 }
adamc@853 281 part[-2] = 0;
adamc@853 282 part_len = part - after_sub_headers - 2;
adamc@853 283 part[0] = 0;
adamc@853 284 part += boundary_len;
adamc@853 285
adamc@853 286 if (filename) {
adamc@853 287 uw_Basis_file f = {filename, type, {part_len, after_sub_headers}};
adamc@853 288
adamc@853 289 if (uw_set_file_input(ctx, name, f)) {
adamc@856 290 log_error(logger_data, "%s\n", uw_error_message(ctx));
adamc@853 291 return FAILED;
adamc@853 292 }
adamc@853 293 } else if (uw_set_input(ctx, name, after_sub_headers)) {
adamc@856 294 log_error(logger_data, "%s\n", uw_error_message(ctx));
adamc@853 295 return FAILED;
adamc@853 296 }
adamc@853 297 }
adamc@853 298 }
adamc@853 299 else {
adamc@854 300 inputs = is_post ? body : query_string;
adamc@853 301
adamc@853 302 if (inputs) {
adamc@853 303 char *name, *value;
adamc@853 304
adamc@853 305 while (*inputs) {
adamc@853 306 name = inputs;
adamc@853 307 if (inputs = strchr(inputs, '&'))
adamc@853 308 *inputs++ = 0;
adamc@853 309 else
adamc@853 310 inputs = strchr(name, 0);
adamc@853 311
adamc@853 312 if (value = strchr(name, '=')) {
adamc@853 313 *value++ = 0;
adamc@853 314 if (uw_set_input(ctx, name, value)) {
adamc@856 315 log_error(logger_data, "%s\n", uw_error_message(ctx));
adamc@853 316 return FAILED;
adamc@853 317 }
adamc@853 318 }
adamc@853 319 else if (uw_set_input(ctx, name, "")) {
adamc@856 320 log_error(logger_data, "%s\n", uw_error_message(ctx));
adamc@853 321 return FAILED;
adamc@853 322 }
adamc@853 323 }
adamc@853 324 }
adamc@853 325 }
adamc@853 326
adamc@856 327 log_debug(logger_data, "Serving URI %s....\n", path);
adamc@853 328
adamc@853 329 while (1) {
adamc@853 330 size_t path_len = strlen(path);
adamc@853 331
adamc@856 332 on_success(ctx);
adamc@853 333
adamc@853 334 if (path_len + 1 > rc->path_copy_size) {
adamc@853 335 rc->path_copy_size = path_len + 1;
adamc@853 336 rc->path_copy = realloc(rc->path_copy, rc->path_copy_size);
adamc@853 337 }
adamc@853 338 strcpy(rc->path_copy, path);
adamc@853 339 fk = uw_begin(ctx, rc->path_copy);
adamc@1065 340 if (fk == SUCCESS || fk == RETURN_INDIRECTLY) {
adamc@853 341 uw_commit(ctx);
adamc@1131 342 if (uw_has_error(ctx)) {
adamc@1131 343 log_error(logger_data, "Fatal error: %s\n", uw_error_message(ctx));
adamc@1131 344
adamc@1131 345 uw_reset_keep_error_message(ctx);
adamc@1131 346 on_failure(ctx);
adamc@1131 347 uw_write_header(ctx, "Content-type: text/html\r\n");
adamc@1131 348 uw_write(ctx, "<html><head><title>Fatal Error</title></head><body>");
adamc@1131 349 uw_write(ctx, "Fatal error: ");
adamc@1131 350 uw_write(ctx, uw_error_message(ctx));
adamc@1131 351 uw_write(ctx, "\n</body></html>");
adamc@1131 352
adamc@1131 353 return FAILED;
adamc@1131 354 } else
adamc@1131 355 return SERVED;
adamc@853 356 } else if (fk == BOUNDED_RETRY) {
adamc@853 357 if (retries_left) {
adamc@856 358 log_debug(logger_data, "Error triggers bounded retry: %s\n", uw_error_message(ctx));
adamc@853 359 --retries_left;
adamc@853 360 }
adamc@853 361 else {
adamc@856 362 log_error(logger_data, "Fatal error (out of retries): %s\n", uw_error_message(ctx));
adamc@853 363
adamc@856 364 try_rollback(ctx, logger_data, log_error);
adamc@853 365
adamc@853 366 uw_reset_keep_error_message(ctx);
adamc@856 367 on_failure(ctx);
adamc@853 368 uw_write_header(ctx, "Content-type: text/plain\r\n");
adamc@853 369 uw_write(ctx, "Fatal error (out of retries): ");
adamc@853 370 uw_write(ctx, uw_error_message(ctx));
adamc@853 371 uw_write(ctx, "\n");
adamc@853 372
adamc@853 373 return FAILED;
adamc@853 374 }
adamc@853 375 } else if (fk == UNLIMITED_RETRY)
adamc@856 376 log_debug(logger_data, "Error triggers unlimited retry: %s\n", uw_error_message(ctx));
adamc@853 377 else if (fk == FATAL) {
adamc@856 378 log_error(logger_data, "Fatal error: %s\n", uw_error_message(ctx));
adamc@853 379
adamc@856 380 try_rollback(ctx, logger_data, log_error);
adamc@853 381
adamc@853 382 uw_reset_keep_error_message(ctx);
adamc@856 383 on_failure(ctx);
adamc@853 384 uw_write_header(ctx, "Content-type: text/html\r\n");
adamc@853 385 uw_write(ctx, "<html><head><title>Fatal Error</title></head><body>");
adamc@853 386 uw_write(ctx, "Fatal error: ");
adamc@853 387 uw_write(ctx, uw_error_message(ctx));
adamc@853 388 uw_write(ctx, "\n</body></html>");
adamc@853 389
adamc@853 390 return FAILED;
adamc@853 391 } else {
adamc@856 392 log_error(logger_data, "Unknown uw_handle return code!\n");
adamc@853 393
adamc@856 394 try_rollback(ctx, logger_data, log_error);
adamc@853 395
adamc@853 396 uw_reset_keep_request(ctx);
adamc@856 397 on_failure(ctx);
adamc@853 398 uw_write_header(ctx, "Content-type: text/plain\r\n");
adamc@853 399 uw_write(ctx, "Unknown uw_handle return code!\n");
adamc@853 400
adamc@853 401 return FAILED;
adamc@853 402 }
adamc@853 403
adamc@856 404 if (try_rollback(ctx, logger_data, log_error))
adamc@853 405 return FAILED;
adamc@853 406
adamc@853 407 uw_reset_keep_request(ctx);
adamc@853 408 }
adamc@853 409 }
adamc@853 410
adamc@856 411 typedef struct {
adamc@1094 412 uw_app *app;
adamc@856 413 void *logger_data;
adamc@856 414 uw_logger log_error, log_debug;
adamc@856 415 } loggers;
adamc@856 416
adamc@853 417 void *client_pruner(void *data) {
adamc@856 418 loggers *ls = (loggers *)data;
adamc@1094 419 uw_context ctx = uw_request_new_context(ls->app, ls->logger_data, ls->log_error, ls->log_debug);
adamc@853 420
adamc@853 421 if (!ctx)
adamc@853 422 exit(1);
adamc@853 423
adamc@853 424 while (1) {
adamc@853 425 uw_prune_clients(ctx);
adamc@853 426 sleep(5);
adamc@853 427 }
adamc@853 428 }