void *rn_cls;
};
-/**
- * Context for handling the shutdown of a service.
- */
-struct ShutdownContext
-{
- /**
- * Scheduler to be used to call continuation
- */
- struct GNUNET_SCHEDULER_Handle *sched;
- /**
- * Connection to the service that is being shutdown.
- */
- struct GNUNET_CLIENT_Connection *sock;
-
- /**
- * Time allowed for shutdown to happen.
- */
- struct GNUNET_TIME_Absolute timeout;
-
- /**
- * Task set up to cancel the shutdown request on timeout.
- */
- GNUNET_SCHEDULER_TaskIdentifier cancel_task;
-
- /**
- * Task to call once shutdown complete
- */
- GNUNET_CLIENT_ShutdownTask cont;
-
- /**
- * Closure for shutdown continuation
- */
- void *cont_cls;
-
- /**
- * We received a confirmation that the service will shut down.
- */
- int confirmed;
-
-};
-
/**
* Struct to refer to a GNUnet TCP connection.
* This is more than just a socket because if the server
/**
* Our configuration.
+ * FIXME: why do we DUP the configuration? Avoid this!
*/
struct GNUNET_CONFIGURATION_Handle *cfg;
* Are we ignoring shutdown signals?
*/
int ignore_shutdown;
+
+ /**
+ * How often have we tried to connect?
+ */
+ unsigned int attempts;
};
+/**
+ * Try to connect to the service.
+ *
+ * @param sched scheduler to use
+ * @param service_name name of service to connect to
+ * @param cfg configuration to use
+ * @param attempt counter used to alternate between IP and UNIX domain sockets
+ * @return NULL on error
+ */
static struct GNUNET_CONNECTION_Handle *
do_connect (struct GNUNET_SCHEDULER_Handle *sched,
const char *service_name,
- const struct GNUNET_CONFIGURATION_Handle *cfg)
+ const struct GNUNET_CONFIGURATION_Handle *cfg,
+ unsigned int attempt)
{
struct GNUNET_CONNECTION_Handle *sock;
char *hostname;
+ char *unixpath;
unsigned long long port;
+#if AF_UNIX
+ if (0 == attempt % 2)
+ {
+ /* on even rounds, try UNIX */
+ if (GNUNET_OK ==
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ service_name,
+ "UNIXPATH", &unixpath))
+ {
+ sock = GNUNET_CONNECTION_create_from_connect_to_unixpath (sched,
+ cfg,
+ unixpath);
+ GNUNET_free (unixpath);
+ if (sock != NULL)
+ return sock;
+ }
+ }
+#endif
+
if ((GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_number (cfg,
service_name,
sock = GNUNET_CONNECTION_create_from_connect (sched,
cfg,
hostname,
- port,
- GNUNET_SERVER_MAX_MESSAGE_SIZE);
+ port);
GNUNET_free (hostname);
return sock;
}
struct GNUNET_CLIENT_Connection *ret;
struct GNUNET_CONNECTION_Handle *sock;
- sock = do_connect (sched, service_name, cfg);
+ sock = do_connect (sched,
+ service_name,
+ cfg, 0);
if (sock == NULL)
return NULL;
ret = GNUNET_malloc (sizeof (struct GNUNET_CLIENT_Connection));
+ ret->attempts = 1;
ret->sock = sock;
ret->sched = sched;
ret->service_name = GNUNET_strdup (service_name);
char mbuf[msize];
struct GNUNET_MessageHeader *msg = (struct GNUNET_MessageHeader *) mbuf;
+#if DEBUG_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received message of type %u and size %u\n",
+ ntohs (cmsg->type),
+ msize);
+#endif
sock->receive_task = GNUNET_SCHEDULER_NO_TASK;
GNUNET_assert (GNUNET_YES == sock->msg_complete);
GNUNET_assert (sock->received_pos >= msize);
}
else
{
+ GNUNET_assert (sock->in_receive == GNUNET_NO);
sock->in_receive = GNUNET_YES;
GNUNET_CONNECTION_receive (sock->sock,
- GNUNET_SERVER_MAX_MESSAGE_SIZE,
+ GNUNET_SERVER_MAX_MESSAGE_SIZE - 1,
timeout, &receive_helper, sock);
}
}
-/**
- * Handler receiving response to service shutdown requests.
- * First call with NULL: service misbehaving, or something.
- * First call with GNUNET_MESSAGE_TYPE_SHUTDOWN_ACK:
- * - service will shutdown
- * First call with GNUNET_MESSAGE_TYPE_SHUTDOWN_REFUSE:
- * - service will not be stopped!
- *
- * Second call with NULL:
- * - service has now really shut down.
- *
- * @param cls closure
- * @param msg NULL, indicating socket closure.
- */
-static void
-service_shutdown_handler (void *cls, const struct GNUNET_MessageHeader *msg)
-{
- struct ShutdownContext *shutdown_ctx = cls;
-
- if ((msg == NULL) && (shutdown_ctx->confirmed != GNUNET_YES)) /* Means the other side closed the connection and never confirmed a shutdown */
- {
- GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Service handle shutdown before ACK!\n");
- if (shutdown_ctx->cont != NULL)
- shutdown_ctx->cont(shutdown_ctx->cont_cls, GNUNET_SYSERR);
-
- GNUNET_SCHEDULER_cancel(shutdown_ctx->sched, shutdown_ctx->cancel_task);
- GNUNET_CLIENT_disconnect (shutdown_ctx->sock, GNUNET_NO);
- GNUNET_free(shutdown_ctx);
- }
- else if ((msg == NULL) && (shutdown_ctx->confirmed == GNUNET_YES))
- {
- GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Service shutdown complete.\n");
- if (shutdown_ctx->cont != NULL)
- shutdown_ctx->cont(shutdown_ctx->cont_cls, GNUNET_NO);
-
- GNUNET_SCHEDULER_cancel(shutdown_ctx->sched, shutdown_ctx->cancel_task);
- GNUNET_CLIENT_disconnect (shutdown_ctx->sock, GNUNET_NO);
- GNUNET_free(shutdown_ctx);
- }
- else
- {
- GNUNET_assert(ntohs(msg->size) == sizeof(struct GNUNET_MessageHeader));
-
- switch (ntohs(msg->type))
- {
- case GNUNET_MESSAGE_TYPE_SHUTDOWN_ACK:
- GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Received confirmation for service shutdown.\n");
- shutdown_ctx->confirmed = GNUNET_YES;
- GNUNET_CLIENT_receive (shutdown_ctx->sock, &service_shutdown_handler, shutdown_ctx, GNUNET_TIME_UNIT_FOREVER_REL);
- break;
- case GNUNET_MESSAGE_TYPE_SHUTDOWN_REFUSE:
- default: /* Fall through */
- GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Service shutdown refused!\n");
- if (shutdown_ctx->cont != NULL)
- shutdown_ctx->cont(shutdown_ctx->cont_cls, GNUNET_YES);
-
- GNUNET_SCHEDULER_cancel(shutdown_ctx->sched, shutdown_ctx->cancel_task);
- GNUNET_CLIENT_disconnect (shutdown_ctx->sock, GNUNET_NO);
- GNUNET_free(shutdown_ctx);
- break;
- }
- }
-}
-
-/**
- * Shutting down took too long, cancel receive and return error.
- *
- * @param cls closure
- * @param tc context information (why was this task triggered now)
- */
-void service_shutdown_cancel (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext * tc)
-{
- struct ShutdownContext *shutdown_ctx = cls;
- GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "service_shutdown_cancel called!\n");
- shutdown_ctx->cont(shutdown_ctx->cont_cls, GNUNET_SYSERR);
- GNUNET_CLIENT_disconnect (shutdown_ctx->sock, GNUNET_NO);
- GNUNET_free(shutdown_ctx);
-}
-/**
- * If possible, write a shutdown message to the target
- * buffer and destroy the client connection.
- *
- * @param cls the "struct GNUNET_CLIENT_Connection" to destroy
- * @param size number of bytes available in buf
- * @param buf NULL on error, otherwise target buffer
- * @return number of bytes written to buf
- */
-static size_t
-write_shutdown (void *cls, size_t size, void *buf)
-{
- struct GNUNET_MessageHeader *msg;
- struct ShutdownContext *shutdown_ctx = cls;
-
- if (size < sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("Failed to transmit shutdown request to client.\n"));
-
- shutdown_ctx->cont(shutdown_ctx->cont_cls, GNUNET_SYSERR);
- GNUNET_CLIENT_disconnect (shutdown_ctx->sock, GNUNET_NO);
- GNUNET_free(shutdown_ctx);
- return 0; /* client disconnected */
- }
-
- GNUNET_CLIENT_receive (shutdown_ctx->sock, &service_shutdown_handler, shutdown_ctx, GNUNET_TIME_UNIT_FOREVER_REL);
- shutdown_ctx->cancel_task = GNUNET_SCHEDULER_add_delayed (shutdown_ctx->sched, GNUNET_TIME_absolute_get_remaining(shutdown_ctx->timeout), &service_shutdown_cancel, shutdown_ctx);
- msg = (struct GNUNET_MessageHeader *) buf;
- msg->type = htons (GNUNET_MESSAGE_TYPE_SHUTDOWN);
- msg->size = htons (sizeof (struct GNUNET_MessageHeader));
- return sizeof (struct GNUNET_MessageHeader);
-}
-
-
-/**
- * Request that the service should shutdown.
- * Afterwards, the connection will automatically be
- * disconnected. Hence the "sock" should not
- * be used by the caller after this call
- * (calling this function frees "sock" after a while).
- *
- * @param sched the scheduler to use for calling shutdown continuation
- * @param sock the socket connected to the service
- * @param timeout how long to wait before giving up on transmission
- * @param cont continuation to call once the service is really down
- * @param cont_cls closure for continuation
- *
- */
-void
-GNUNET_CLIENT_service_shutdown (struct GNUNET_SCHEDULER_Handle *sched,
- struct GNUNET_CLIENT_Connection *sock,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_CLIENT_ShutdownTask cont,
- void *cont_cls)
-{
- struct ShutdownContext *shutdown_ctx;
- shutdown_ctx = GNUNET_malloc(sizeof(struct ShutdownContext));
- shutdown_ctx->sched = sched;
- shutdown_ctx->cont = cont;
- shutdown_ctx->cont_cls = cont_cls;
- shutdown_ctx->sock = sock;
- shutdown_ctx->timeout = GNUNET_TIME_relative_to_absolute(timeout);
-
- GNUNET_CONNECTION_notify_transmit_ready (sock->sock,
- sizeof (struct
- GNUNET_MessageHeader),
- timeout,
- &write_shutdown, shutdown_ctx);
-}
-
-
/**
* Report service unavailable.
*/
_("Failure to transmit TEST request.\n"));
#endif
service_test_error (conn->sched, conn->test_cb, conn->test_cb_cls);
+ GNUNET_CLIENT_disconnect (conn, GNUNET_NO);
return 0; /* client disconnected */
}
#if DEBUG_CLIENT
/* auto-retry */
GNUNET_CONNECTION_destroy (th->sock->sock, GNUNET_NO);
th->sock->sock = do_connect (th->sock->sched,
- th->sock->service_name, th->sock->cfg);
+ th->sock->service_name,
+ th->sock->cfg,
+ th->sock->attempts++);
GNUNET_assert (NULL != th->sock->sock);
GNUNET_CONNECTION_ignore_shutdown (th->sock->sock,
th->sock->ignore_shutdown);
}
else
{
- GNUNET_break (NULL != th->th);
+ GNUNET_assert (NULL != th->th);
GNUNET_CONNECTION_notify_transmit_ready_cancel (th->th);
}
th->sock->th = NULL;