adamc@116: #include <stdio.h>
adamc@116: 
adamc@116: #include <string.h>
adamc@116: #include <sys/types.h>
adamc@116: #include <sys/socket.h>
adamc@116: #include <netinet/in.h>
adamc@472: #include <unistd.h>
adamc@116: 
adamc@138: #include <pthread.h>
adamc@138: 
adamc@244: #include "urweb.h"
adamc@117: 
adamc@311: int uw_backlog = 10;
adamc@311: int uw_bufsize = 1024;
adamc@116: 
adamc@138: typedef struct node {
adamc@138:   int fd;
adamc@138:   struct node *next;
adamc@138: } *node;
adamc@138: 
adamc@138: static node front = NULL, back = NULL;
adamc@138: 
adamc@138: static int empty() {
adamc@138:   return front == NULL;
adamc@138: }
adamc@138: 
adamc@138: static void enqueue(int fd) {
adamc@138:   node n = malloc(sizeof(struct node));
adamc@138: 
adamc@138:   n->fd = fd;
adamc@138:   n->next = NULL;
adamc@138:   if (back)
adamc@138:     back->next = n;
adamc@138:   else
adamc@138:     front = n;
adamc@138:   back = n;
adamc@138: }
adamc@138: 
adamc@138: static int dequeue() {
adamc@138:   int ret = front->fd;
adamc@138: 
adamc@138:   front = front->next;
adamc@138:   if (!front)
adamc@138:     back = NULL;
adamc@138: 
adamc@138:   return ret;
adamc@138: }
adamc@138: 
adamc@138: static pthread_mutex_t queue_mutex = PTHREAD_MUTEX_INITIALIZER;
adamc@138: static pthread_cond_t queue_cond = PTHREAD_COND_INITIALIZER;
adamc@138: 
adamc@167: #define MAX_RETRIES 5
adamc@167: 
adamc@424: int uw_db_begin(uw_context);
adamc@424: int uw_db_commit(uw_context);
adamc@424: int uw_db_rollback(uw_context);
adamc@424: 
adamc@424: static int try_rollback(uw_context ctx) {
adamc@424:   int r = uw_db_rollback(ctx);
adamc@424: 
adamc@424:   if (r) {
adamc@424:     printf("Error running SQL ROLLBACK\n");
adamc@424:     uw_reset(ctx);
adamc@424:     uw_write(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
adamc@424:     uw_write(ctx, "Content-type: text/plain\r\n\r\n");
adamc@424:     uw_write(ctx, "Error running SQL ROLLBACK\n");
adamc@424:   }
adamc@424: 
adamc@424:   return r;
adamc@424: }
adamc@424: 
adamc@138: static void *worker(void *data) {
adamc@324:   int me = *(int *)data, retries_left = MAX_RETRIES;
adamc@466:   uw_context ctx = uw_init(0, 1024, 0);
adamc@272:   
adamc@272:   while (1) {
adamc@311:     failure_kind fk = uw_begin_init(ctx);
adamc@272: 
adamc@272:     if (fk == SUCCESS) {
adamc@311:       uw_db_init(ctx);
adamc@272:       printf("Database connection initialized.\n");
adamc@272:       break;
adamc@272:     } else if (fk == BOUNDED_RETRY) {
adamc@272:       if (retries_left) {
adamc@311:         printf("Initialization error triggers bounded retry: %s\n", uw_error_message(ctx));
adamc@272:         --retries_left;
adamc@272:       } else {
adamc@311:         printf("Fatal initialization error (out of retries): %s\n", uw_error_message(ctx));
adamc@311:         uw_free(ctx);
adamc@272:         return NULL;
adamc@272:       }
adamc@272:     } else if (fk == UNLIMITED_RETRY)
adamc@311:       printf("Initialization error triggers unlimited retry: %s\n", uw_error_message(ctx));
adamc@272:     else if (fk == FATAL) {
adamc@311:       printf("Fatal initialization error: %s\n", uw_error_message(ctx));
adamc@311:       uw_free(ctx);
adamc@272:       return NULL;
adamc@272:     } else {
adamc@311:       printf("Unknown uw_handle return code!\n");
adamc@311:       uw_free(ctx);
adamc@272:       return NULL;
adamc@272:     }
adamc@272:   }
adamc@116: 
adamc@116:   while (1) {
adamc@311:     char buf[uw_bufsize+1], *back = buf, *s;
adamc@138:     int sock;
adamc@116: 
adamc@138:     pthread_mutex_lock(&queue_mutex);
adamc@138:     while (empty())
adamc@138:       pthread_cond_wait(&queue_cond, &queue_mutex);
adamc@138:     sock = dequeue();
adamc@138:     pthread_mutex_unlock(&queue_mutex);
adamc@138: 
adamc@138:     printf("Handling connection with thread #%d.\n", me);
adamc@138: 
adamc@138:     while (1) {
adamc@167:       unsigned retries_left = MAX_RETRIES;
adamc@311:       int r = recv(sock, back, uw_bufsize - (back - buf), 0);
adamc@138: 
adamc@138:       if (r < 0) {
adamc@138:         fprintf(stderr, "Recv failed\n");
adamc@138:         break;
adamc@138:       }
adamc@138: 
adamc@138:       if (r == 0) {
adamc@138:         printf("Connection closed.\n");
adamc@138:         break;
adamc@138:       }
adamc@138: 
adamc@138:       printf("Received %d bytes.\n", r);
adamc@138: 
adamc@138:       back += r;
adamc@138:       *back = 0;
adamc@138:     
adamc@138:       if (s = strstr(buf, "\r\n\r\n")) {
adamc@424:         failure_kind fk;
adamc@457:         char *cmd, *path, *headers, path_copy[uw_bufsize+1], *inputs;
adamc@138: 
adamc@475:         s[2] = 0;
adamc@144: 
adamc@138:         if (!(s = strstr(buf, "\r\n"))) {
adamc@138:           fprintf(stderr, "No newline in buf\n");
adamc@138:           break;
adamc@138:         }
adamc@138: 
adamc@138:         *s = 0;
adamc@457:         headers = s + 2;
adamc@138:         cmd = s = buf;
adamc@401: 
adamc@401:         printf("Read: %s\n", buf);
adamc@138:       
adamc@138:         if (!strsep(&s, " ")) {
adamc@138:           fprintf(stderr, "No first space in HTTP command\n");
adamc@138:           break;
adamc@138:         }
adamc@138: 
adamc@138:         if (strcmp(cmd, "GET")) {
adamc@138:           fprintf(stderr, "Not ready for non-get command: %s\n", cmd);
adamc@138:           break;
adamc@138:         }
adamc@138: 
adamc@138:         path = s;
adamc@138:         if (!strsep(&s, " ")) {
adamc@138:           fprintf(stderr, "No second space in HTTP command\n");
adamc@138:           break;
adamc@138:         }
adamc@138: 
adamc@144:         if (inputs = strchr(path, '?')) {
adamc@144:           char *name, *value;
adamc@144:           *inputs++ = 0;
adamc@144: 
adamc@144:           while (*inputs) {
adamc@144:             name = inputs;
adamc@145:             if (inputs = strchr(inputs, '&'))
adamc@145:               *inputs++ = 0;
adamc@145:             else
adamc@145:               inputs = strchr(name, 0);
adamc@145: 
adamc@145:             if (value = strchr(name, '=')) {
adamc@144:               *value++ = 0;
adamc@311:               uw_set_input(ctx, name, value);
adamc@144:             }
adamc@145:             else
adamc@311:               uw_set_input(ctx, name, "");
adamc@144:           }
adamc@144:         }
adamc@144: 
adamc@138:         printf("Serving URI %s....\n", path);
adamc@138: 
adamc@458:         uw_set_headers(ctx, headers);
adamc@458: 
adamc@167:         while (1) {
adamc@500:           uw_write(ctx, "<html>");
adamc@500: 
adamc@424:           if (uw_db_begin(ctx)) {
adamc@424:             printf("Error running SQL BEGIN\n");
adamc@424:             if (retries_left)
adamc@424:               --retries_left;
adamc@424:             else {
adamc@424:               fk = FATAL;
adamc@424:               uw_reset(ctx);
adamc@464:               uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
adamc@464:               uw_write_header(ctx, "Content-type: text/plain\r\n\r\n");
adamc@424:               uw_write(ctx, "Error running SQL BEGIN\n");
adamc@424: 
adamc@424:               break;
adamc@424:             }
adamc@424:           }
adamc@167: 
adamc@462:           uw_write_header(ctx, "HTTP/1.1 200 OK\r\n");
adamc@462:           uw_write_header(ctx, "Content-type: text/html\r\n");
adamc@167: 
adamc@400:           strcpy(path_copy, path);
adamc@458:           fk = uw_begin(ctx, path_copy);
adamc@167:           if (fk == SUCCESS) {
adamc@464:             uw_write(ctx, "</html>");
adamc@464: 
adamc@424:             if (uw_db_commit(ctx)) {
adamc@424:               fk = FATAL;
adamc@424: 
adamc@424:               printf("Error running SQL COMMIT\n");
adamc@424:               uw_reset(ctx);
adamc@464:               uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
adamc@464:               uw_write_header(ctx, "Content-type: text/plain\r\n");
adamc@424:               uw_write(ctx, "Error running SQL COMMIT\n");
adamc@424:             }
adamc@424: 
adamc@167:             break;
adamc@167:           } else if (fk == BOUNDED_RETRY) {
adamc@167:             if (retries_left) {
adamc@311:               printf("Error triggers bounded retry: %s\n", uw_error_message(ctx));
adamc@167:               --retries_left;
adamc@167:             }
adamc@167:             else {
adamc@311:               printf("Fatal error (out of retries): %s\n", uw_error_message(ctx));
adamc@167: 
adamc@311:               uw_reset_keep_error_message(ctx);
adamc@464:               uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
adamc@464:               uw_write_header(ctx, "Content-type: text/plain\r\n");
adamc@311:               uw_write(ctx, "Fatal error (out of retries): ");
adamc@311:               uw_write(ctx, uw_error_message(ctx));
adamc@311:               uw_write(ctx, "\n");
adamc@424: 
adamc@424:               try_rollback(ctx);
adamc@424: 
adamc@424:               break;
adamc@167:             }
adamc@167:           } else if (fk == UNLIMITED_RETRY)
adamc@311:             printf("Error triggers unlimited retry: %s\n", uw_error_message(ctx));
adamc@167:           else if (fk == FATAL) {
adamc@311:             printf("Fatal error: %s\n", uw_error_message(ctx));
adamc@167: 
adamc@311:             uw_reset_keep_error_message(ctx);
adamc@464:             uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\r\n");
adamc@464:             uw_write_header(ctx, "Content-type: text/plain\r\n");
adamc@311:             uw_write(ctx, "Fatal error: ");
adamc@311:             uw_write(ctx, uw_error_message(ctx));
adamc@311:             uw_write(ctx, "\n");
adamc@167: 
adamc@424:             try_rollback(ctx);
adamc@424: 
adamc@167:             break;
adamc@167:           } else {
adamc@311:             printf("Unknown uw_handle return code!\n");
adamc@167: 
adamc@311:             uw_reset_keep_request(ctx);
adamc@464:             uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
adamc@464:             uw_write_header(ctx, "Content-type: text/plain\r\n");
adamc@311:             uw_write(ctx, "Unknown uw_handle return code!\n");
adamc@167: 
adamc@424:             try_rollback(ctx);
adamc@424: 
adamc@167:             break;
adamc@167:           }
adamc@167: 
adamc@311:           uw_reset_keep_request(ctx);
adamc@424: 
adamc@424:           if (try_rollback(ctx))
adamc@424:             break;
adamc@167:         }
adamc@138: 
adamc@311:         uw_send(ctx, sock);
adamc@138: 
adamc@138:         printf("Done with client.\n\n");
adamc@324:         uw_memstats(ctx);
adamc@138:         break;
adamc@138:       }
adamc@116:     }
adamc@116: 
adamc@138:     close(sock);
adamc@311:     uw_reset(ctx);
adamc@116:   }
adamc@116: }
adamc@102: 
adamc@477: static void help(char *cmd) {
adamc@477:   printf("Usage: %s [-p <port>] [-t <thread-count>]\n", cmd);
adamc@477: }
adamc@477: 
adamc@138: int main(int argc, char *argv[]) {
adamc@116:   // The skeleton for this function comes from Beej's sockets tutorial.
adamc@138:   int sockfd;  // listen on sock_fd
adamc@116:   struct sockaddr_in my_addr;
adamc@116:   struct sockaddr_in their_addr; // connector's address information
adamc@116:   int sin_size, yes = 1;
adamc@472:   int uw_port = 8080, nthreads = 1, i, *names, opt;
adamc@472:   
adamc@477:   while ((opt = getopt(argc, argv, "hp:t:")) != -1) {
adamc@472:     switch (opt) {
adamc@472:     case '?':
adamc@472:       fprintf(stderr, "Unknown command-line option");
adamc@477:       help(argv[0]);
adamc@472:       return 1;
adamc@138: 
adamc@477:     case 'h':
adamc@477:       help(argv[0]);
adamc@477:       return 0;
adamc@477: 
adamc@472:     case 'p':
adamc@472:       uw_port = atoi(optarg);
adamc@472:       if (uw_port <= 0) {
adamc@472:         fprintf(stderr, "Invalid port number\n");
adamc@477:         help(argv[0]);
adamc@472:         return 1;
adamc@472:       }
adamc@472:       break;
adamc@472: 
adamc@472:     case 't':
adamc@472:       nthreads = atoi(optarg);
adamc@472:       if (nthreads <= 0) {
adamc@472:         fprintf(stderr, "Invalid thread count\n");
adamc@477:         help(argv[0]);
adamc@472:         return 1;
adamc@472:       }
adamc@472:       break;
adamc@472: 
adamc@472:     default:
adamc@472:       fprintf(stderr, "Unexpected getopt() behavior\n");
adamc@472:       return 1;
adamc@472:     }
adamc@138:   }
adamc@138: 
adamc@138:   names = calloc(nthreads, sizeof(int));
adamc@116: 
adamc@116:   sockfd = socket(PF_INET, SOCK_STREAM, 0); // do some error checking!
adamc@116: 
adamc@116:   if (sockfd < 0) {
adamc@116:     fprintf(stderr, "Listener socket creation failed\n");
adamc@116:     return 1;
adamc@116:   }
adamc@116: 
adamc@116:   if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) < 0) {
adamc@116:     fprintf(stderr, "Listener socket option setting failed\n");
adamc@116:     return 1;
adamc@116:   }
adamc@116: 
adamc@116:   my_addr.sin_family = AF_INET;         // host byte order
adamc@311:   my_addr.sin_port = htons(uw_port);    // short, network byte order
adamc@116:   my_addr.sin_addr.s_addr = INADDR_ANY; // auto-fill with my IP
adamc@116:   memset(my_addr.sin_zero, '\0', sizeof my_addr.sin_zero);
adamc@116: 
adamc@116:   if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof my_addr) < 0) {
adamc@116:     fprintf(stderr, "Listener socket bind failed\n");
adamc@116:     return 1;
adamc@116:   }
adamc@116: 
adamc@311:   if (listen(sockfd, uw_backlog) < 0) {
adamc@116:     fprintf(stderr, "Socket listen failed\n");
adamc@116:     return 1;
adamc@116:   }
adamc@116: 
adamc@116:   sin_size = sizeof their_addr;
adamc@116: 
adamc@311:   printf("Listening on port %d....\n", uw_port);
adamc@116: 
adamc@138:   for (i = 0; i < nthreads; ++i) {
adamc@138:     pthread_t thread;    
adamc@138:     names[i] = i;
adamc@138:     if (pthread_create(&thread, NULL, worker, &names[i])) {
adamc@138:       fprintf(stderr, "Error creating worker thread #%d\n", i);
adamc@138:       return 1;
adamc@138:     }
adamc@138:   }
adamc@138: 
adamc@116:   while (1) {
adamc@138:     int new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
adamc@116: 
adamc@116:     if (new_fd < 0) {
adamc@116:       fprintf(stderr, "Socket accept failed\n");
adamc@116:       return 1;
adamc@116:     }
adamc@116: 
adamc@116:     printf("Accepted connection.\n");
adamc@138: 
adamc@138:     pthread_mutex_lock(&queue_mutex);
adamc@138:     enqueue(new_fd);
adamc@139:     pthread_cond_broadcast(&queue_cond);
adamc@138:     pthread_mutex_unlock(&queue_mutex);
adamc@116:   }
adamc@102: }