Mercurial > urweb
view src/c/driver.c @ 441:c5335613f31e
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author | Adam Chlipala <adamc@hcoop.net> |
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date | Thu, 30 Oct 2008 15:33:28 -0400 |
parents | b10132434adc |
children | 360cbc202756 |
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#include <stdio.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <pthread.h> #include "urweb.h" int uw_port = 8080; int uw_backlog = 10; int uw_bufsize = 1024; typedef struct node { int fd; struct node *next; } *node; static node front = NULL, back = NULL; static int empty() { return front == NULL; } static void enqueue(int fd) { node n = malloc(sizeof(struct node)); n->fd = fd; n->next = NULL; if (back) back->next = n; else front = n; back = n; } static int dequeue() { int ret = front->fd; front = front->next; if (!front) back = NULL; return ret; } static pthread_mutex_t queue_mutex = PTHREAD_MUTEX_INITIALIZER; static pthread_cond_t queue_cond = PTHREAD_COND_INITIALIZER; #define MAX_RETRIES 5 int uw_db_begin(uw_context); int uw_db_commit(uw_context); int uw_db_rollback(uw_context); static int try_rollback(uw_context ctx) { int r = uw_db_rollback(ctx); if (r) { printf("Error running SQL ROLLBACK\n"); uw_reset(ctx); uw_write(ctx, "HTTP/1.1 500 Internal Server Error\n\r"); uw_write(ctx, "Content-type: text/plain\r\n\r\n"); uw_write(ctx, "Error running SQL ROLLBACK\n"); } return r; } static void *worker(void *data) { int me = *(int *)data, retries_left = MAX_RETRIES; uw_context ctx = uw_init(1024, 0); while (1) { failure_kind fk = uw_begin_init(ctx); if (fk == SUCCESS) { uw_db_init(ctx); printf("Database connection initialized.\n"); break; } else if (fk == BOUNDED_RETRY) { if (retries_left) { printf("Initialization error triggers bounded retry: %s\n", uw_error_message(ctx)); --retries_left; } else { printf("Fatal initialization error (out of retries): %s\n", uw_error_message(ctx)); uw_free(ctx); return NULL; } } else if (fk == UNLIMITED_RETRY) printf("Initialization error triggers unlimited retry: %s\n", uw_error_message(ctx)); else if (fk == FATAL) { printf("Fatal initialization error: %s\n", uw_error_message(ctx)); uw_free(ctx); return NULL; } else { printf("Unknown uw_handle return code!\n"); uw_free(ctx); return NULL; } } while (1) { char buf[uw_bufsize+1], *back = buf, *s; int sock; pthread_mutex_lock(&queue_mutex); while (empty()) pthread_cond_wait(&queue_cond, &queue_mutex); sock = dequeue(); pthread_mutex_unlock(&queue_mutex); printf("Handling connection with thread #%d.\n", me); while (1) { unsigned retries_left = MAX_RETRIES; int r = recv(sock, back, uw_bufsize - (back - buf), 0); if (r < 0) { fprintf(stderr, "Recv failed\n"); break; } if (r == 0) { printf("Connection closed.\n"); break; } printf("Received %d bytes.\n", r); back += r; *back = 0; if (s = strstr(buf, "\r\n\r\n")) { failure_kind fk; char *cmd, *path, path_copy[uw_bufsize+1], *inputs; *s = 0; if (!(s = strstr(buf, "\r\n"))) { fprintf(stderr, "No newline in buf\n"); break; } *s = 0; cmd = s = buf; printf("Read: %s\n", buf); if (!strsep(&s, " ")) { fprintf(stderr, "No first space in HTTP command\n"); break; } if (strcmp(cmd, "GET")) { fprintf(stderr, "Not ready for non-get command: %s\n", cmd); break; } path = s; if (!strsep(&s, " ")) { fprintf(stderr, "No second space in HTTP command\n"); break; } if (inputs = strchr(path, '?')) { char *name, *value; *inputs++ = 0; while (*inputs) { name = inputs; if (inputs = strchr(inputs, '&')) *inputs++ = 0; else inputs = strchr(name, 0); if (value = strchr(name, '=')) { *value++ = 0; uw_set_input(ctx, name, value); } else uw_set_input(ctx, name, ""); } } printf("Serving URI %s....\n", path); while (1) { if (uw_db_begin(ctx)) { printf("Error running SQL BEGIN\n"); if (retries_left) --retries_left; else { fk = FATAL; uw_reset(ctx); uw_write(ctx, "HTTP/1.1 500 Internal Server Error\n\r"); uw_write(ctx, "Content-type: text/plain\r\n\r\n"); uw_write(ctx, "Error running SQL BEGIN\n"); break; } } uw_write(ctx, "HTTP/1.1 200 OK\r\n"); uw_write(ctx, "Content-type: text/html\r\n\r\n"); uw_write(ctx, "<html>"); strcpy(path_copy, path); fk = uw_begin(ctx, path_copy); if (fk == SUCCESS) { uw_write(ctx, "</html>"); if (uw_db_commit(ctx)) { fk = FATAL; printf("Error running SQL COMMIT\n"); uw_reset(ctx); uw_write(ctx, "HTTP/1.1 500 Internal Server Error\n\r"); uw_write(ctx, "Content-type: text/plain\r\n\r\n"); uw_write(ctx, "Error running SQL COMMIT\n"); } break; } else if (fk == BOUNDED_RETRY) { if (retries_left) { printf("Error triggers bounded retry: %s\n", uw_error_message(ctx)); --retries_left; } else { printf("Fatal error (out of retries): %s\n", uw_error_message(ctx)); uw_reset_keep_error_message(ctx); uw_write(ctx, "HTTP/1.1 500 Internal Server Error\n\r"); uw_write(ctx, "Content-type: text/plain\r\n\r\n"); uw_write(ctx, "Fatal error (out of retries): "); uw_write(ctx, uw_error_message(ctx)); uw_write(ctx, "\n"); try_rollback(ctx); break; } } else if (fk == UNLIMITED_RETRY) printf("Error triggers unlimited retry: %s\n", uw_error_message(ctx)); else if (fk == FATAL) { printf("Fatal error: %s\n", uw_error_message(ctx)); uw_reset_keep_error_message(ctx); uw_write(ctx, "HTTP/1.1 500 Internal Server Error\n\r"); uw_write(ctx, "Content-type: text/plain\r\n\r\n"); uw_write(ctx, "Fatal error: "); uw_write(ctx, uw_error_message(ctx)); uw_write(ctx, "\n"); try_rollback(ctx); break; } else { printf("Unknown uw_handle return code!\n"); uw_reset_keep_request(ctx); uw_write(ctx, "HTTP/1.1 500 Internal Server Error\n\r"); uw_write(ctx, "Content-type: text/plain\r\n\r\n"); uw_write(ctx, "Unknown uw_handle return code!\n"); try_rollback(ctx); break; } uw_reset_keep_request(ctx); if (try_rollback(ctx)) break; } uw_send(ctx, sock); printf("Done with client.\n\n"); uw_memstats(ctx); break; } } close(sock); uw_reset(ctx); } } int main(int argc, char *argv[]) { // The skeleton for this function comes from Beej's sockets tutorial. int sockfd; // listen on sock_fd struct sockaddr_in my_addr; struct sockaddr_in their_addr; // connector's address information int sin_size, yes = 1; int nthreads, i, *names; if (argc < 2) { fprintf(stderr, "No thread count specified\n"); return 1; } nthreads = atoi(argv[1]); if (nthreads <= 0) { fprintf(stderr, "Invalid thread count\n"); return 1; } names = calloc(nthreads, sizeof(int)); sockfd = socket(PF_INET, SOCK_STREAM, 0); // do some error checking! if (sockfd < 0) { fprintf(stderr, "Listener socket creation failed\n"); return 1; } if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) < 0) { fprintf(stderr, "Listener socket option setting failed\n"); return 1; } my_addr.sin_family = AF_INET; // host byte order my_addr.sin_port = htons(uw_port); // short, network byte order my_addr.sin_addr.s_addr = INADDR_ANY; // auto-fill with my IP memset(my_addr.sin_zero, '\0', sizeof my_addr.sin_zero); if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof my_addr) < 0) { fprintf(stderr, "Listener socket bind failed\n"); return 1; } if (listen(sockfd, uw_backlog) < 0) { fprintf(stderr, "Socket listen failed\n"); return 1; } sin_size = sizeof their_addr; printf("Listening on port %d....\n", uw_port); for (i = 0; i < nthreads; ++i) { pthread_t thread; names[i] = i; if (pthread_create(&thread, NULL, worker, &names[i])) { fprintf(stderr, "Error creating worker thread #%d\n", i); return 1; } } while (1) { int new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size); if (new_fd < 0) { fprintf(stderr, "Socket accept failed\n"); return 1; } printf("Accepted connection.\n"); pthread_mutex_lock(&queue_mutex); enqueue(new_fd); pthread_cond_broadcast(&queue_cond); pthread_mutex_unlock(&queue_mutex); } }