2005-11-15 Carl Worth <cworth@cworth.org>

[ttt] / src / ttt-client.c

diff --git a/src/ttt-client.c b/src/ttt-client.c
index b42db7a95064811b95fff78b4f0070236b4fe69c..9d44945e506664678854fab51c41fa3fd04e870d 100644 (file)
--- a/src/ttt-client.c
+++ b/src/ttt-client.c
@@ -1,4 +1,4 @@
-/* ttt.c - client-server tic-tac-toe game
+/* ttt-client.c - client handling code for tic-tac-toe game server
  *
  * Copyright © 2005 Carl Worth
  *
@@ -19,17 +19,216 @@
  * Author: Carl Worth <cworth@cworth.org>
  */
 
-#include "ttt.h"
+#include "ttt-client.h"
 
-int 
-main (int argc, char **argv)
+#include "ttt-server.h"
+#include "ttt-socket.h"
+#include "ttt-error.h"
+
+struct _ttt_client {
+    pthread_mutex_t mutex;
+    pthread_t thread;
+
+    ttt_server_t *server;
+    int socket;
+
+    int id;
+
+    char buf[TTT_CLIENT_BUF_SIZE];
+    char *buf_head;
+    char *buf_tail;
+
+    char *request;
+    int request_size;
+    int request_len;
+};
+
+static void
+_ttt_client_init (ttt_client_t *client,
+                 ttt_server_t  *server,
+                 int            socket)
+{
+    pthread_mutex_init (&client->mutex, NULL);
+
+    client->server = server;
+    client->socket = socket;
+
+    client->buf_head = client->buf;
+    client->buf_tail = client->buf;
+
+    client->request = NULL;
+    client->request_size = 0;
+    client->request_len = 0;
+
+    /* XXX: Probably want to register only as the result of the HELO
+       command.  Not only will that match the protocol correctly, but
+       it will also eliminate a race condition here. */
+    client->id = ttt_server_register_client (server, client);
+}
+
+static void
+_ttt_client_fini (ttt_client_t *client)
+{
+    pthread_mutex_lock (&client->mutex);
+
+    ttt_server_unregister_client (client->server, client);
+
+    shutdown (client->socket, SHUT_RDWR);
+
+    free (client->request);
+
+    pthread_mutex_unlock (&client->mutex);
+
+    pthread_mutex_destroy (&client->mutex);
+}
+
+static void
+_append_to_request (ttt_client_t       *client,
+                   const char          *buf,
+                   int                  size)
+{
+    int size_needed = client->request_len + size;
+
+    if (size_needed > client->request_size) {
+       if (client->request_size == 0) {
+           client->request_size = size_needed;
+       } else {
+           while (size_needed > client->request_size)
+               client->request_size *= 2;
+       }
+
+       client->request = xrealloc (client->request, client->request_size);
+    }
+
+    memcpy (client->request + client->request_len,
+           buf, size);
+
+    client->request_len += size;
+}
+
+static ttt_status_t
+_read_into_request_until (ttt_client_t *client, char delimeter)
+{
+    ttt_bool_t found_delimeter = FALSE;
+    int bytes_read;
+    char *s;
+
+    client->request_len = 0;
+
+    while (1) {
+
+       if (client->buf_tail >= client->buf_head) {
+           bytes_read = xread (client->socket,
+                               client->buf,
+                               TTT_CLIENT_BUF_SIZE);
+           if (bytes_read == 0)
+               return TTT_STATUS_EOF;
+           client->buf_head = client->buf;
+           client->buf_tail = client->buf_head + bytes_read;
+       }
+
+       for (s = client->buf_head; s < client->buf_tail; s++) {
+           if (*s == delimeter) {
+               found_delimeter = TRUE;
+               s++;
+               break;
+           }
+       }
+
+       _append_to_request (client,
+                           client->buf_head,
+                           s - client->buf_head);
+       client->buf_head = s;
+
+       if (found_delimeter)
+           return TTT_STATUS_SUCCESS;
+    }
+}
+
+static ttt_status_t
+_read_request (ttt_client_t *client)
+{
+    ttt_status_t status;
+    static const char null_terminator = '\0';
+
+    status = _read_into_request_until (client, '\n');
+    if (status)
+       return status;
+
+    _append_to_request (client, &null_terminator, 1);
+
+    return TTT_STATUS_SUCCESS;
+}
+
+static ttt_error_t
+_execute_request (ttt_client_t *client)
+{
+    ttt_server_broadcast (client->server, client->request);
+
+    return TTT_ERROR_NONE;
+}
+
+static void *
+_handle_requests_thread (void *closure)
 {
-    ttt_args_t args;
-    int args_first;
+    ttt_status_t status;
+    ttt_error_t error;
+    ttt_client_t *client = closure;
 
-    ttt_args_parse (&args, argc, argv, &args_first);
+    while (1) {
 
-    /* XXX: insert code here */
+       status = _read_request (client);
+       if (status == TTT_STATUS_EOF)
+           break;
+       if (status)
+           ASSERT_NOT_REACHED;
 
-    return 0;
+       error = _execute_request (client);
+       if (error)
+           ttt_client_send (client, ttt_error_string (error));
+    }
+
+    _ttt_client_fini (client);
+    free (client);
+
+    return (void *) 0;
+}
+
+/* Exported: See ttt-client.h for documentation. */
+void
+ttt_client_new (void *closure, int client_socket)
+{
+    ttt_server_t *server = closure;
+    ttt_client_t *client;
+    int err;
+
+    client = xmalloc (sizeof (ttt_client_t));
+    
+    _ttt_client_init (client, server, client_socket);
+
+    err = pthread_create (&client->thread, NULL,
+                         _handle_requests_thread, client);
+    if (err != 0) {
+       fprintf (stderr, "Error: pthread_create failed: %s. Aborting.\n",
+                strerror (err));
+       exit (1);
+    }
+}
+
+/* Exported: See ttt-client.h for documentation. */
+void
+ttt_client_send (ttt_client_t *client, const char *message)
+{
+    pthread_mutex_lock (&client->mutex);
+
+    ttt_socket_write (client->socket, message, strlen (message));
+
+    pthread_mutex_unlock (&client->mutex);
+}
+
+/* Exported: See ttt-client.h for documentation. */
+int
+ttt_client_get_id (ttt_client_t *client)
+{
+    return client->id;
 }