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annotate src/c/driver.c @ 703:a5d8b470d7ca

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Fixing some regressions and other bugs
author Adam Chlipala <adamc@hcoop.net>
date Sun, 05 Apr 2009 16:17:32 -0400
parents db6ab16cd8f3
children 1b1047992ecf
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 static int try_rollback(uw_context ctx) {
adamc@671 57 int r = uw_rollback(ctx);
adamc@424 58
adamc@424 59 if (r) {
adamc@424 60 printf("Error running SQL ROLLBACK\n");
adamc@424 61 uw_reset(ctx);
adamc@424 62 uw_write(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
adamc@424 63 uw_write(ctx, "Content-type: text/plain\r\n\r\n");
adamc@424 64 uw_write(ctx, "Error running SQL ROLLBACK\n");
adamc@424 65 }
adamc@424 66
adamc@424 67 return r;
adamc@424 68 }
adamc@424 69
adamc@698 70 static uw_context new_context() {
adamc@687 71 uw_context ctx = uw_init();
adamc@698 72 int retries_left = MAX_RETRIES;
adamc@698 73
adamc@272 74 while (1) {
adamc@311 75 failure_kind fk = uw_begin_init(ctx);
adamc@272 76
adamc@272 77 if (fk == SUCCESS) {
adamc@272 78 printf("Database connection initialized.\n");
adamc@272 79 break;
adamc@272 80 } else if (fk == BOUNDED_RETRY) {
adamc@272 81 if (retries_left) {
adamc@311 82 printf("Initialization error triggers bounded retry: %s\n", uw_error_message(ctx));
adamc@272 83 --retries_left;
adamc@272 84 } else {
adamc@311 85 printf("Fatal initialization error (out of retries): %s\n", uw_error_message(ctx));
adamc@311 86 uw_free(ctx);
adamc@272 87 return NULL;
adamc@272 88 }
adamc@272 89 } else if (fk == UNLIMITED_RETRY)
adamc@311 90 printf("Initialization error triggers unlimited retry: %s\n", uw_error_message(ctx));
adamc@272 91 else if (fk == FATAL) {
adamc@311 92 printf("Fatal initialization error: %s\n", uw_error_message(ctx));
adamc@311 93 uw_free(ctx);
adamc@272 94 return NULL;
adamc@272 95 } else {
adamc@698 96 printf("Unknown uw_begin_init return code!\n");
adamc@311 97 uw_free(ctx);
adamc@272 98 return NULL;
adamc@272 99 }
adamc@272 100 }
adamc@116 101
adamc@698 102 return ctx;
adamc@698 103 }
adamc@698 104
adamc@698 105 static void *worker(void *data) {
adamc@698 106 int me = *(int *)data, retries_left = MAX_RETRIES;
adamc@698 107 uw_context ctx = new_context();
adamc@698 108
adamc@116 109 while (1) {
adamc@311 110 char buf[uw_bufsize+1], *back = buf, *s;
adamc@667 111 int sock, dont_close = 0;
adamc@116 112
adamc@138 113 pthread_mutex_lock(&queue_mutex);
adamc@138 114 while (empty())
adamc@138 115 pthread_cond_wait(&queue_cond, &queue_mutex);
adamc@138 116 sock = dequeue();
adamc@138 117 pthread_mutex_unlock(&queue_mutex);
adamc@138 118
adamc@138 119 printf("Handling connection with thread #%d.\n", me);
adamc@138 120
adamc@138 121 while (1) {
adamc@167 122 unsigned retries_left = MAX_RETRIES;
adamc@311 123 int r = recv(sock, back, uw_bufsize - (back - buf), 0);
adamc@138 124
adamc@138 125 if (r < 0) {
adamc@138 126 fprintf(stderr, "Recv failed\n");
adamc@138 127 break;
adamc@138 128 }
adamc@138 129
adamc@138 130 if (r == 0) {
adamc@138 131 printf("Connection closed.\n");
adamc@138 132 break;
adamc@138 133 }
adamc@138 134
adamc@138 135 printf("Received %d bytes.\n", r);
adamc@138 136
adamc@138 137 back += r;
adamc@138 138 *back = 0;
adamc@138 139
adamc@138 140 if (s = strstr(buf, "\r\n\r\n")) {
adamc@424 141 failure_kind fk;
adamc@457 142 char *cmd, *path, *headers, path_copy[uw_bufsize+1], *inputs;
adamc@138 143
adamc@475 144 s[2] = 0;
adamc@144 145
adamc@138 146 if (!(s = strstr(buf, "\r\n"))) {
adamc@138 147 fprintf(stderr, "No newline in buf\n");
adamc@138 148 break;
adamc@138 149 }
adamc@138 150
adamc@138 151 *s = 0;
adamc@457 152 headers = s + 2;
adamc@138 153 cmd = s = buf;
adamc@401 154
adamc@401 155 printf("Read: %s\n", buf);
adamc@138 156
adamc@138 157 if (!strsep(&s, " ")) {
adamc@138 158 fprintf(stderr, "No first space in HTTP command\n");
adamc@138 159 break;
adamc@138 160 }
adamc@138 161
adamc@138 162 if (strcmp(cmd, "GET")) {
adamc@138 163 fprintf(stderr, "Not ready for non-get command: %s\n", cmd);
adamc@138 164 break;
adamc@138 165 }
adamc@138 166
adamc@138 167 path = s;
adamc@138 168 if (!strsep(&s, " ")) {
adamc@138 169 fprintf(stderr, "No second space in HTTP command\n");
adamc@138 170 break;
adamc@138 171 }
adamc@138 172
adamc@668 173 uw_set_headers(ctx, headers);
adamc@668 174
adamc@668 175 if (!strcmp(path, "/.msgs")) {
adamc@668 176 char *id = uw_Basis_requestHeader(ctx, "UrWeb-Client");
adamc@668 177 char *pass = uw_Basis_requestHeader(ctx, "UrWeb-Pass");
adamc@668 178
adamc@668 179 if (id && pass) {
adamc@682 180 unsigned idn = atoi(id);
adamc@668 181 uw_client_connect(idn, atoi(pass), sock);
adamc@668 182 dont_close = 1;
adamc@682 183 fprintf(stderr, "Processed request for messages by client %u\n\n", idn);
adamc@668 184 }
adamc@703 185 else {
adamc@703 186 fprintf(stderr, "Missing fields in .msgs request: %s, %s\n\n", id, pass);
adamc@703 187 }
adamc@667 188 break;
adamc@667 189 }
adamc@667 190
adamc@144 191 if (inputs = strchr(path, '?')) {
adamc@144 192 char *name, *value;
adamc@144 193 *inputs++ = 0;
adamc@144 194
adamc@144 195 while (*inputs) {
adamc@144 196 name = inputs;
adamc@145 197 if (inputs = strchr(inputs, '&'))
adamc@145 198 *inputs++ = 0;
adamc@145 199 else
adamc@145 200 inputs = strchr(name, 0);
adamc@145 201
adamc@145 202 if (value = strchr(name, '=')) {
adamc@144 203 *value++ = 0;
adamc@311 204 uw_set_input(ctx, name, value);
adamc@144 205 }
adamc@145 206 else
adamc@311 207 uw_set_input(ctx, name, "");
adamc@144 208 }
adamc@144 209 }
adamc@144 210
adamc@138 211 printf("Serving URI %s....\n", path);
adamc@138 212
adamc@167 213 while (1) {
adamc@462 214 uw_write_header(ctx, "HTTP/1.1 200 OK\r\n");
adamc@167 215
adamc@400 216 strcpy(path_copy, path);
adamc@458 217 fk = uw_begin(ctx, path_copy);
adamc@167 218 if (fk == SUCCESS) {
adamc@671 219 uw_commit(ctx);
adamc@167 220 break;
adamc@167 221 } else if (fk == BOUNDED_RETRY) {
adamc@167 222 if (retries_left) {
adamc@311 223 printf("Error triggers bounded retry: %s\n", uw_error_message(ctx));
adamc@167 224 --retries_left;
adamc@167 225 }
adamc@167 226 else {
adamc@311 227 printf("Fatal error (out of retries): %s\n", uw_error_message(ctx));
adamc@167 228
adamc@682 229 try_rollback(ctx);
adamc@682 230
adamc@311 231 uw_reset_keep_error_message(ctx);
adamc@464 232 uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
adamc@464 233 uw_write_header(ctx, "Content-type: text/plain\r\n");
adamc@311 234 uw_write(ctx, "Fatal error (out of retries): ");
adamc@311 235 uw_write(ctx, uw_error_message(ctx));
adamc@311 236 uw_write(ctx, "\n");
adamc@424 237
adamc@424 238 break;
adamc@167 239 }
adamc@167 240 } else if (fk == UNLIMITED_RETRY)
adamc@311 241 printf("Error triggers unlimited retry: %s\n", uw_error_message(ctx));
adamc@167 242 else if (fk == FATAL) {
adamc@311 243 printf("Fatal error: %s\n", uw_error_message(ctx));
adamc@167 244
adamc@682 245 try_rollback(ctx);
adamc@682 246
adamc@311 247 uw_reset_keep_error_message(ctx);
adamc@464 248 uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\r\n");
adamc@548 249 uw_write_header(ctx, "Content-type: text/html\r\n");
adamc@548 250 uw_write(ctx, "<html><head><title>Fatal Error</title></head><body>");
adamc@311 251 uw_write(ctx, "Fatal error: ");
adamc@311 252 uw_write(ctx, uw_error_message(ctx));
adamc@548 253 uw_write(ctx, "\n</body></html>");
adamc@167 254
adamc@167 255 break;
adamc@167 256 } else {
adamc@311 257 printf("Unknown uw_handle return code!\n");
adamc@167 258
adamc@682 259 try_rollback(ctx);
adamc@682 260
adamc@311 261 uw_reset_keep_request(ctx);
adamc@464 262 uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
adamc@464 263 uw_write_header(ctx, "Content-type: text/plain\r\n");
adamc@311 264 uw_write(ctx, "Unknown uw_handle return code!\n");
adamc@167 265
adamc@167 266 break;
adamc@167 267 }
adamc@167 268
adamc@424 269 if (try_rollback(ctx))
adamc@424 270 break;
adamc@682 271
adamc@682 272 uw_reset_keep_request(ctx);
adamc@167 273 }
adamc@138 274
adamc@311 275 uw_send(ctx, sock);
adamc@138 276
adamc@138 277 printf("Done with client.\n\n");
adamc@324 278 uw_memstats(ctx);
adamc@138 279 break;
adamc@138 280 }
adamc@116 281 }
adamc@116 282
adamc@667 283 if (!dont_close)
adamc@667 284 close(sock);
adamc@311 285 uw_reset(ctx);
adamc@116 286 }
adamc@116 287 }
adamc@102 288
adamc@667 289 static void *client_pruner(void *data) {
adamc@698 290 uw_context ctx = new_context();
adamc@698 291
adamc@698 292 if (!ctx)
adamc@698 293 exit(1);
adamc@683 294
adamc@667 295 while (1) {
adamc@683 296 uw_prune_clients(ctx);
adamc@667 297 sleep(5);
adamc@667 298 }
adamc@667 299 }
adamc@667 300
adamc@477 301 static void help(char *cmd) {
adamc@477 302 printf("Usage: %s [-p <port>] [-t <thread-count>]\n", cmd);
adamc@477 303 }
adamc@477 304
adamc@502 305 static void sigint(int signum) {
adamc@502 306 printf("Exiting....\n");
adamc@502 307 exit(0);
adamc@502 308 }
adamc@502 309
adamc@687 310 static void initialize() {
adamc@698 311 uw_context ctx = new_context();
adamc@700 312 failure_kind fk;
adamc@687 313
adamc@698 314 if (!ctx)
adamc@698 315 exit(1);
adamc@698 316
adamc@700 317 for (fk = uw_initialize(ctx); fk == UNLIMITED_RETRY; fk = uw_initialize(ctx)) {
adamc@700 318 printf("Unlimited retry during init: %s\n", uw_error_message(ctx));
adamc@700 319 uw_db_rollback(ctx);
adamc@700 320 uw_reset(ctx);
adamc@700 321 }
adamc@700 322
adamc@700 323 if (fk != SUCCESS) {
adamc@700 324 printf("Failed to initialize database! %s\n", uw_error_message(ctx));
adamc@687 325 uw_db_rollback(ctx);
adamc@687 326 exit(1);
adamc@687 327 }
adamc@687 328
adamc@687 329 uw_free(ctx);
adamc@687 330 }
adamc@687 331
adamc@138 332 int main(int argc, char *argv[]) {
adamc@116 333 // The skeleton for this function comes from Beej's sockets tutorial.
adamc@138 334 int sockfd; // listen on sock_fd
adamc@116 335 struct sockaddr_in my_addr;
adamc@116 336 struct sockaddr_in their_addr; // connector's address information
adamc@116 337 int sin_size, yes = 1;
adamc@472 338 int uw_port = 8080, nthreads = 1, i, *names, opt;
adamc@502 339
adamc@502 340 signal(SIGINT, sigint);
adamc@505 341 signal(SIGPIPE, SIG_IGN);
adamc@505 342
adamc@477 343 while ((opt = getopt(argc, argv, "hp:t:")) != -1) {
adamc@472 344 switch (opt) {
adamc@472 345 case '?':
adamc@472 346 fprintf(stderr, "Unknown command-line option");
adamc@477 347 help(argv[0]);
adamc@472 348 return 1;
adamc@138 349
adamc@477 350 case 'h':
adamc@477 351 help(argv[0]);
adamc@477 352 return 0;
adamc@477 353
adamc@472 354 case 'p':
adamc@472 355 uw_port = atoi(optarg);
adamc@472 356 if (uw_port <= 0) {
adamc@472 357 fprintf(stderr, "Invalid port number\n");
adamc@477 358 help(argv[0]);
adamc@472 359 return 1;
adamc@472 360 }
adamc@472 361 break;
adamc@472 362
adamc@472 363 case 't':
adamc@472 364 nthreads = atoi(optarg);
adamc@472 365 if (nthreads <= 0) {
adamc@472 366 fprintf(stderr, "Invalid thread count\n");
adamc@477 367 help(argv[0]);
adamc@472 368 return 1;
adamc@472 369 }
adamc@472 370 break;
adamc@472 371
adamc@472 372 default:
adamc@472 373 fprintf(stderr, "Unexpected getopt() behavior\n");
adamc@472 374 return 1;
adamc@472 375 }
adamc@138 376 }
adamc@138 377
adamc@687 378 initialize();
adamc@687 379
adamc@138 380 names = calloc(nthreads, sizeof(int));
adamc@116 381
adamc@116 382 sockfd = socket(PF_INET, SOCK_STREAM, 0); // do some error checking!
adamc@116 383
adamc@116 384 if (sockfd < 0) {
adamc@116 385 fprintf(stderr, "Listener socket creation failed\n");
adamc@116 386 return 1;
adamc@116 387 }
adamc@116 388
adamc@116 389 if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) < 0) {
adamc@116 390 fprintf(stderr, "Listener socket option setting failed\n");
adamc@116 391 return 1;
adamc@116 392 }
adamc@116 393
adamc@116 394 my_addr.sin_family = AF_INET; // host byte order
adamc@311 395 my_addr.sin_port = htons(uw_port); // short, network byte order
adamc@116 396 my_addr.sin_addr.s_addr = INADDR_ANY; // auto-fill with my IP
adamc@116 397 memset(my_addr.sin_zero, '\0', sizeof my_addr.sin_zero);
adamc@116 398
adamc@116 399 if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof my_addr) < 0) {
adamc@116 400 fprintf(stderr, "Listener socket bind failed\n");
adamc@116 401 return 1;
adamc@116 402 }
adamc@116 403
adamc@311 404 if (listen(sockfd, uw_backlog) < 0) {
adamc@116 405 fprintf(stderr, "Socket listen failed\n");
adamc@116 406 return 1;
adamc@116 407 }
adamc@116 408
adamc@116 409 sin_size = sizeof their_addr;
adamc@116 410
adamc@667 411 uw_global_init();
adamc@667 412
adamc@311 413 printf("Listening on port %d....\n", uw_port);
adamc@116 414
adamc@667 415 {
adamc@667 416 pthread_t thread;
adamc@667 417 int name;
adamc@667 418
adamc@667 419 if (pthread_create(&thread, NULL, client_pruner, &name)) {
adamc@667 420 fprintf(stderr, "Error creating pruner thread\n");
adamc@667 421 return 1;
adamc@667 422 }
adamc@667 423 }
adamc@667 424
adamc@138 425 for (i = 0; i < nthreads; ++i) {
adamc@138 426 pthread_t thread;
adamc@138 427 names[i] = i;
adamc@138 428 if (pthread_create(&thread, NULL, worker, &names[i])) {
adamc@138 429 fprintf(stderr, "Error creating worker thread #%d\n", i);
adamc@138 430 return 1;
adamc@138 431 }
adamc@138 432 }
adamc@138 433
adamc@116 434 while (1) {
adamc@138 435 int new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
adamc@116 436
adamc@116 437 if (new_fd < 0) {
adamc@116 438 fprintf(stderr, "Socket accept failed\n");
adamc@116 439 return 1;
adamc@116 440 }
adamc@116 441
adamc@116 442 printf("Accepted connection.\n");
adamc@138 443
adamc@138 444 pthread_mutex_lock(&queue_mutex);
adamc@138 445 enqueue(new_fd);
adamc@139 446 pthread_cond_broadcast(&queue_cond);
adamc@138 447 pthread_mutex_unlock(&queue_mutex);
adamc@116 448 }
adamc@102 449 }