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annotate src/c/driver.c @ 667:a93d5324f400

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Dummy message delivery to clients
author Adam Chlipala <adamc@hcoop.net>
date Thu, 19 Mar 2009 16:34:13 -0400
parents 162d5308e34f
children b0c1a46b1f15
rev   line source
adamc@116 1 #include <stdio.h>
adamc@116 2
adamc@116 3 #include <string.h>
adamc@502 4 #include <stdlib.h>
adamc@116 5 #include <sys/types.h>
adamc@116 6 #include <sys/socket.h>
adamc@116 7 #include <netinet/in.h>
adamc@472 8 #include <unistd.h>
adamc@502 9 #include <signal.h>
adamc@116 10
adamc@138 11 #include <pthread.h>
adamc@138 12
adamc@244 13 #include "urweb.h"
adamc@117 14
adamc@311 15 int uw_backlog = 10;
adamc@311 16 int uw_bufsize = 1024;
adamc@116 17
adamc@138 18 typedef struct node {
adamc@138 19 int fd;
adamc@138 20 struct node *next;
adamc@138 21 } *node;
adamc@138 22
adamc@138 23 static node front = NULL, back = NULL;
adamc@138 24
adamc@138 25 static int empty() {
adamc@138 26 return front == NULL;
adamc@138 27 }
adamc@138 28
adamc@138 29 static void enqueue(int fd) {
adamc@138 30 node n = malloc(sizeof(struct node));
adamc@138 31
adamc@138 32 n->fd = fd;
adamc@138 33 n->next = NULL;
adamc@138 34 if (back)
adamc@138 35 back->next = n;
adamc@138 36 else
adamc@138 37 front = n;
adamc@138 38 back = n;
adamc@138 39 }
adamc@138 40
adamc@138 41 static int dequeue() {
adamc@138 42 int ret = front->fd;
adamc@138 43
adamc@138 44 front = front->next;
adamc@138 45 if (!front)
adamc@138 46 back = NULL;
adamc@138 47
adamc@138 48 return ret;
adamc@138 49 }
adamc@138 50
adamc@138 51 static pthread_mutex_t queue_mutex = PTHREAD_MUTEX_INITIALIZER;
adamc@138 52 static pthread_cond_t queue_cond = PTHREAD_COND_INITIALIZER;
adamc@138 53
adamc@167 54 #define MAX_RETRIES 5
adamc@167 55
adamc@424 56 int uw_db_begin(uw_context);
adamc@424 57 int uw_db_commit(uw_context);
adamc@424 58 int uw_db_rollback(uw_context);
adamc@424 59
adamc@424 60 static int try_rollback(uw_context ctx) {
adamc@424 61 int r = uw_db_rollback(ctx);
adamc@424 62
adamc@424 63 if (r) {
adamc@424 64 printf("Error running SQL ROLLBACK\n");
adamc@424 65 uw_reset(ctx);
adamc@424 66 uw_write(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
adamc@424 67 uw_write(ctx, "Content-type: text/plain\r\n\r\n");
adamc@424 68 uw_write(ctx, "Error running SQL ROLLBACK\n");
adamc@424 69 }
adamc@424 70
adamc@424 71 return r;
adamc@424 72 }
adamc@424 73
adamc@138 74 static void *worker(void *data) {
adamc@324 75 int me = *(int *)data, retries_left = MAX_RETRIES;
adamc@562 76 uw_context ctx = uw_init(0, 0, 1024, 0);
adamc@272 77
adamc@272 78 while (1) {
adamc@311 79 failure_kind fk = uw_begin_init(ctx);
adamc@272 80
adamc@272 81 if (fk == SUCCESS) {
adamc@311 82 uw_db_init(ctx);
adamc@272 83 printf("Database connection initialized.\n");
adamc@272 84 break;
adamc@272 85 } else if (fk == BOUNDED_RETRY) {
adamc@272 86 if (retries_left) {
adamc@311 87 printf("Initialization error triggers bounded retry: %s\n", uw_error_message(ctx));
adamc@272 88 --retries_left;
adamc@272 89 } else {
adamc@311 90 printf("Fatal initialization error (out of retries): %s\n", uw_error_message(ctx));
adamc@311 91 uw_free(ctx);
adamc@272 92 return NULL;
adamc@272 93 }
adamc@272 94 } else if (fk == UNLIMITED_RETRY)
adamc@311 95 printf("Initialization error triggers unlimited retry: %s\n", uw_error_message(ctx));
adamc@272 96 else if (fk == FATAL) {
adamc@311 97 printf("Fatal initialization error: %s\n", uw_error_message(ctx));
adamc@311 98 uw_free(ctx);
adamc@272 99 return NULL;
adamc@272 100 } else {
adamc@311 101 printf("Unknown uw_handle return code!\n");
adamc@311 102 uw_free(ctx);
adamc@272 103 return NULL;
adamc@272 104 }
adamc@272 105 }
adamc@116 106
adamc@116 107 while (1) {
adamc@311 108 char buf[uw_bufsize+1], *back = buf, *s;
adamc@667 109 int sock, dont_close = 0;
adamc@116 110
adamc@138 111 pthread_mutex_lock(&queue_mutex);
adamc@138 112 while (empty())
adamc@138 113 pthread_cond_wait(&queue_cond, &queue_mutex);
adamc@138 114 sock = dequeue();
adamc@138 115 pthread_mutex_unlock(&queue_mutex);
adamc@138 116
adamc@138 117 printf("Handling connection with thread #%d.\n", me);
adamc@138 118
adamc@138 119 while (1) {
adamc@167 120 unsigned retries_left = MAX_RETRIES;
adamc@311 121 int r = recv(sock, back, uw_bufsize - (back - buf), 0);
adamc@138 122
adamc@138 123 if (r < 0) {
adamc@138 124 fprintf(stderr, "Recv failed\n");
adamc@138 125 break;
adamc@138 126 }
adamc@138 127
adamc@138 128 if (r == 0) {
adamc@138 129 printf("Connection closed.\n");
adamc@138 130 break;
adamc@138 131 }
adamc@138 132
adamc@138 133 printf("Received %d bytes.\n", r);
adamc@138 134
adamc@138 135 back += r;
adamc@138 136 *back = 0;
adamc@138 137
adamc@138 138 if (s = strstr(buf, "\r\n\r\n")) {
adamc@424 139 failure_kind fk;
adamc@457 140 char *cmd, *path, *headers, path_copy[uw_bufsize+1], *inputs;
adamc@667 141 int id, pass;
adamc@138 142
adamc@475 143 s[2] = 0;
adamc@144 144
adamc@138 145 if (!(s = strstr(buf, "\r\n"))) {
adamc@138 146 fprintf(stderr, "No newline in buf\n");
adamc@138 147 break;
adamc@138 148 }
adamc@138 149
adamc@138 150 *s = 0;
adamc@457 151 headers = s + 2;
adamc@138 152 cmd = s = buf;
adamc@401 153
adamc@401 154 printf("Read: %s\n", buf);
adamc@138 155
adamc@138 156 if (!strsep(&s, " ")) {
adamc@138 157 fprintf(stderr, "No first space in HTTP command\n");
adamc@138 158 break;
adamc@138 159 }
adamc@138 160
adamc@138 161 if (strcmp(cmd, "GET")) {
adamc@138 162 fprintf(stderr, "Not ready for non-get command: %s\n", cmd);
adamc@138 163 break;
adamc@138 164 }
adamc@138 165
adamc@138 166 path = s;
adamc@138 167 if (!strsep(&s, " ")) {
adamc@138 168 fprintf(stderr, "No second space in HTTP command\n");
adamc@138 169 break;
adamc@138 170 }
adamc@138 171
adamc@667 172 if (sscanf(path, "/.msgs/%d/%d", &id, &pass) == 2) {
adamc@667 173 uw_client_connect(id, pass, sock);
adamc@667 174 dont_close = 1;
adamc@667 175 break;
adamc@667 176 }
adamc@667 177
adamc@144 178 if (inputs = strchr(path, '?')) {
adamc@144 179 char *name, *value;
adamc@144 180 *inputs++ = 0;
adamc@144 181
adamc@144 182 while (*inputs) {
adamc@144 183 name = inputs;
adamc@145 184 if (inputs = strchr(inputs, '&'))
adamc@145 185 *inputs++ = 0;
adamc@145 186 else
adamc@145 187 inputs = strchr(name, 0);
adamc@145 188
adamc@145 189 if (value = strchr(name, '=')) {
adamc@144 190 *value++ = 0;
adamc@311 191 uw_set_input(ctx, name, value);
adamc@144 192 }
adamc@145 193 else
adamc@311 194 uw_set_input(ctx, name, "");
adamc@144 195 }
adamc@144 196 }
adamc@144 197
adamc@138 198 printf("Serving URI %s....\n", path);
adamc@138 199
adamc@458 200 uw_set_headers(ctx, headers);
adamc@458 201
adamc@167 202 while (1) {
adamc@424 203 if (uw_db_begin(ctx)) {
adamc@424 204 printf("Error running SQL BEGIN\n");
adamc@424 205 if (retries_left)
adamc@424 206 --retries_left;
adamc@424 207 else {
adamc@424 208 fk = FATAL;
adamc@424 209 uw_reset(ctx);
adamc@464 210 uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
adamc@464 211 uw_write_header(ctx, "Content-type: text/plain\r\n\r\n");
adamc@424 212 uw_write(ctx, "Error running SQL BEGIN\n");
adamc@424 213
adamc@424 214 break;
adamc@424 215 }
adamc@424 216 }
adamc@167 217
adamc@462 218 uw_write_header(ctx, "HTTP/1.1 200 OK\r\n");
adamc@167 219
adamc@400 220 strcpy(path_copy, path);
adamc@458 221 fk = uw_begin(ctx, path_copy);
adamc@167 222 if (fk == SUCCESS) {
adamc@424 223 if (uw_db_commit(ctx)) {
adamc@424 224 fk = FATAL;
adamc@424 225
adamc@424 226 printf("Error running SQL COMMIT\n");
adamc@424 227 uw_reset(ctx);
adamc@464 228 uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
adamc@464 229 uw_write_header(ctx, "Content-type: text/plain\r\n");
adamc@424 230 uw_write(ctx, "Error running SQL COMMIT\n");
adamc@424 231 }
adamc@424 232
adamc@167 233 break;
adamc@167 234 } else if (fk == BOUNDED_RETRY) {
adamc@167 235 if (retries_left) {
adamc@311 236 printf("Error triggers bounded retry: %s\n", uw_error_message(ctx));
adamc@167 237 --retries_left;
adamc@167 238 }
adamc@167 239 else {
adamc@311 240 printf("Fatal error (out of retries): %s\n", uw_error_message(ctx));
adamc@167 241
adamc@311 242 uw_reset_keep_error_message(ctx);
adamc@464 243 uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
adamc@464 244 uw_write_header(ctx, "Content-type: text/plain\r\n");
adamc@311 245 uw_write(ctx, "Fatal error (out of retries): ");
adamc@311 246 uw_write(ctx, uw_error_message(ctx));
adamc@311 247 uw_write(ctx, "\n");
adamc@424 248
adamc@424 249 try_rollback(ctx);
adamc@424 250
adamc@424 251 break;
adamc@167 252 }
adamc@167 253 } else if (fk == UNLIMITED_RETRY)
adamc@311 254 printf("Error triggers unlimited retry: %s\n", uw_error_message(ctx));
adamc@167 255 else if (fk == FATAL) {
adamc@311 256 printf("Fatal error: %s\n", uw_error_message(ctx));
adamc@167 257
adamc@311 258 uw_reset_keep_error_message(ctx);
adamc@464 259 uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\r\n");
adamc@548 260 uw_write_header(ctx, "Content-type: text/html\r\n");
adamc@548 261 uw_write(ctx, "<html><head><title>Fatal Error</title></head><body>");
adamc@311 262 uw_write(ctx, "Fatal error: ");
adamc@311 263 uw_write(ctx, uw_error_message(ctx));
adamc@548 264 uw_write(ctx, "\n</body></html>");
adamc@167 265
adamc@424 266 try_rollback(ctx);
adamc@424 267
adamc@167 268 break;
adamc@167 269 } else {
adamc@311 270 printf("Unknown uw_handle return code!\n");
adamc@167 271
adamc@311 272 uw_reset_keep_request(ctx);
adamc@464 273 uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
adamc@464 274 uw_write_header(ctx, "Content-type: text/plain\r\n");
adamc@311 275 uw_write(ctx, "Unknown uw_handle return code!\n");
adamc@167 276
adamc@424 277 try_rollback(ctx);
adamc@424 278
adamc@167 279 break;
adamc@167 280 }
adamc@167 281
adamc@311 282 uw_reset_keep_request(ctx);
adamc@424 283
adamc@424 284 if (try_rollback(ctx))
adamc@424 285 break;
adamc@167 286 }
adamc@138 287
adamc@311 288 uw_send(ctx, sock);
adamc@138 289
adamc@138 290 printf("Done with client.\n\n");
adamc@324 291 uw_memstats(ctx);
adamc@138 292 break;
adamc@138 293 }
adamc@116 294 }
adamc@116 295
adamc@667 296 if (!dont_close)
adamc@667 297 close(sock);
adamc@311 298 uw_reset(ctx);
adamc@116 299 }
adamc@116 300 }
adamc@102 301
adamc@667 302 static void *client_pruner(void *data) {
adamc@667 303 while (1) {
adamc@667 304 uw_prune_clients(5);
adamc@667 305 sleep(5);
adamc@667 306 }
adamc@667 307 }
adamc@667 308
adamc@477 309 static void help(char *cmd) {
adamc@477 310 printf("Usage: %s [-p <port>] [-t <thread-count>]\n", cmd);
adamc@477 311 }
adamc@477 312
adamc@502 313 static void sigint(int signum) {
adamc@502 314 printf("Exiting....\n");
adamc@502 315 exit(0);
adamc@502 316 }
adamc@502 317
adamc@138 318 int main(int argc, char *argv[]) {
adamc@116 319 // The skeleton for this function comes from Beej's sockets tutorial.
adamc@138 320 int sockfd; // listen on sock_fd
adamc@116 321 struct sockaddr_in my_addr;
adamc@116 322 struct sockaddr_in their_addr; // connector's address information
adamc@116 323 int sin_size, yes = 1;
adamc@472 324 int uw_port = 8080, nthreads = 1, i, *names, opt;
adamc@502 325
adamc@502 326 signal(SIGINT, sigint);
adamc@505 327 signal(SIGPIPE, SIG_IGN);
adamc@505 328
adamc@477 329 while ((opt = getopt(argc, argv, "hp:t:")) != -1) {
adamc@472 330 switch (opt) {
adamc@472 331 case '?':
adamc@472 332 fprintf(stderr, "Unknown command-line option");
adamc@477 333 help(argv[0]);
adamc@472 334 return 1;
adamc@138 335
adamc@477 336 case 'h':
adamc@477 337 help(argv[0]);
adamc@477 338 return 0;
adamc@477 339
adamc@472 340 case 'p':
adamc@472 341 uw_port = atoi(optarg);
adamc@472 342 if (uw_port <= 0) {
adamc@472 343 fprintf(stderr, "Invalid port number\n");
adamc@477 344 help(argv[0]);
adamc@472 345 return 1;
adamc@472 346 }
adamc@472 347 break;
adamc@472 348
adamc@472 349 case 't':
adamc@472 350 nthreads = atoi(optarg);
adamc@472 351 if (nthreads <= 0) {
adamc@472 352 fprintf(stderr, "Invalid thread count\n");
adamc@477 353 help(argv[0]);
adamc@472 354 return 1;
adamc@472 355 }
adamc@472 356 break;
adamc@472 357
adamc@472 358 default:
adamc@472 359 fprintf(stderr, "Unexpected getopt() behavior\n");
adamc@472 360 return 1;
adamc@472 361 }
adamc@138 362 }
adamc@138 363
adamc@138 364 names = calloc(nthreads, sizeof(int));
adamc@116 365
adamc@116 366 sockfd = socket(PF_INET, SOCK_STREAM, 0); // do some error checking!
adamc@116 367
adamc@116 368 if (sockfd < 0) {
adamc@116 369 fprintf(stderr, "Listener socket creation failed\n");
adamc@116 370 return 1;
adamc@116 371 }
adamc@116 372
adamc@116 373 if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) < 0) {
adamc@116 374 fprintf(stderr, "Listener socket option setting failed\n");
adamc@116 375 return 1;
adamc@116 376 }
adamc@116 377
adamc@116 378 my_addr.sin_family = AF_INET; // host byte order
adamc@311 379 my_addr.sin_port = htons(uw_port); // short, network byte order
adamc@116 380 my_addr.sin_addr.s_addr = INADDR_ANY; // auto-fill with my IP
adamc@116 381 memset(my_addr.sin_zero, '\0', sizeof my_addr.sin_zero);
adamc@116 382
adamc@116 383 if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof my_addr) < 0) {
adamc@116 384 fprintf(stderr, "Listener socket bind failed\n");
adamc@116 385 return 1;
adamc@116 386 }
adamc@116 387
adamc@311 388 if (listen(sockfd, uw_backlog) < 0) {
adamc@116 389 fprintf(stderr, "Socket listen failed\n");
adamc@116 390 return 1;
adamc@116 391 }
adamc@116 392
adamc@116 393 sin_size = sizeof their_addr;
adamc@116 394
adamc@667 395 uw_global_init();
adamc@667 396
adamc@311 397 printf("Listening on port %d....\n", uw_port);
adamc@116 398
adamc@667 399 {
adamc@667 400 pthread_t thread;
adamc@667 401 int name;
adamc@667 402
adamc@667 403 if (pthread_create(&thread, NULL, client_pruner, &name)) {
adamc@667 404 fprintf(stderr, "Error creating pruner thread\n");
adamc@667 405 return 1;
adamc@667 406 }
adamc@667 407 }
adamc@667 408
adamc@138 409 for (i = 0; i < nthreads; ++i) {
adamc@138 410 pthread_t thread;
adamc@138 411 names[i] = i;
adamc@138 412 if (pthread_create(&thread, NULL, worker, &names[i])) {
adamc@138 413 fprintf(stderr, "Error creating worker thread #%d\n", i);
adamc@138 414 return 1;
adamc@138 415 }
adamc@138 416 }
adamc@138 417
adamc@116 418 while (1) {
adamc@138 419 int new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
adamc@116 420
adamc@116 421 if (new_fd < 0) {
adamc@116 422 fprintf(stderr, "Socket accept failed\n");
adamc@116 423 return 1;
adamc@116 424 }
adamc@116 425
adamc@116 426 printf("Accepted connection.\n");
adamc@138 427
adamc@138 428 pthread_mutex_lock(&queue_mutex);
adamc@138 429 enqueue(new_fd);
adamc@139 430 pthread_cond_broadcast(&queue_cond);
adamc@138 431 pthread_mutex_unlock(&queue_mutex);
adamc@116 432 }
adamc@102 433 }