#define DEBUG_CLIENT GNUNET_NO
-
/**
* How often do we re-try tranmsitting requests before giving up?
* Note that if we succeeded transmitting a request but failed to read
* a response, we do NOT re-try.
*/
-#define MAX_ATTEMPTS 10
+#define MAX_ATTEMPTS 50
/**
GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
/**
- * Timeout.
+ * Timeout for the operation overall.
*/
struct GNUNET_TIME_Absolute timeout;
void *rn_cls;
};
-
/**
* Struct to refer to a GNUnet TCP connection.
* This is more than just a socket because if the server
*/
struct GNUNET_CONNECTION_Handle *sock;
- /**
- * Our scheduler.
- */
- struct GNUNET_SCHEDULER_Handle *sched;
-
/**
* Our configuration.
+ * FIXME: why do we DUP the configuration? Avoid this!
*/
struct GNUNET_CONFIGURATION_Handle *cfg;
*/
GNUNET_SCHEDULER_Task test_cb;
+ /**
+ * Deadline for calling 'test_cb'.
+ */
+ struct GNUNET_TIME_Absolute test_deadline;
+
/**
* If we are re-trying and are delaying to do so,
* handle to the scheduled task managing the delay.
*/
struct GNUNET_TIME_Absolute receive_timeout;
+ /**
+ * Current value for our incremental back-off (for
+ * connect re-tries).
+ */
+ struct GNUNET_TIME_Relative back_off;
+
/**
* Number of bytes in received_buf that are valid.
*/
*/
int in_receive;
-};
+ /**
+ * 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 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)
+do_connect (const char *service_name,
+ 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 (cfg,
+ unixpath);
+ GNUNET_free (unixpath);
+ if (sock != NULL)
+ return sock;
+ }
+ }
+#endif
+
if ((GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_number (cfg,
service_name,
service_name);
return NULL;
}
- sock = GNUNET_CONNECTION_create_from_connect (sched,
- cfg,
+ sock = GNUNET_CONNECTION_create_from_connect (cfg,
hostname,
- port,
- GNUNET_SERVER_MAX_MESSAGE_SIZE);
+ port);
GNUNET_free (hostname);
return sock;
}
/**
* Get a connection with a service.
*
- * @param sched scheduler to use
* @param service_name name of the service
* @param cfg configuration to use
* @return NULL on error (service unknown to configuration)
*/
struct GNUNET_CLIENT_Connection *
-GNUNET_CLIENT_connect (struct GNUNET_SCHEDULER_Handle *sched,
- const char *service_name,
+GNUNET_CLIENT_connect (const char *service_name,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct GNUNET_CLIENT_Connection *ret;
struct GNUNET_CONNECTION_Handle *sock;
- sock = do_connect (sched, service_name, cfg);
+ sock = do_connect (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);
ret->cfg = GNUNET_CONFIGURATION_dup (cfg);
+ ret->back_off = GNUNET_TIME_UNIT_MILLISECONDS;
return ret;
}
+/**
+ * Configure this connection to ignore shutdown signals.
+ *
+ * @param h client handle
+ * @param do_ignore GNUNET_YES to ignore, GNUNET_NO to restore default
+ */
+void
+GNUNET_CLIENT_ignore_shutdown (struct GNUNET_CLIENT_Connection *h,
+ int do_ignore)
+{
+ h->ignore_shutdown = do_ignore;
+ if (h->sock != NULL)
+ GNUNET_CONNECTION_ignore_shutdown (h->sock,
+ do_ignore);
+}
+
+
/**
* Destroy connection with the service. This will automatically
* cancel any pending "receive" request (however, the handler will
* *NOT* be called, not even with a NULL message). Any pending
* transmission request will also be cancelled UNLESS the callback for
* the transmission request has already been called, in which case the
- * transmission is guaranteed to complete before the socket is fully
- * destroyed (unless, of course, there is an error with the server
- * in which case the message may still be lost).
+ * transmission 'finish_pending_write' argument determines whether or
+ * not the write is guaranteed to complete before the socket is fully
+ * destroyed (unless, of course, there is an error with the server in
+ * which case the message may still be lost).
*
+ * @param finish_pending_write should a transmission already passed to the
+ * handle be completed?
* @param sock handle to the service connection
*/
void
-GNUNET_CLIENT_disconnect (struct GNUNET_CLIENT_Connection *sock)
+GNUNET_CLIENT_disconnect (struct GNUNET_CLIENT_Connection *sock,
+ int finish_pending_write)
{
GNUNET_assert (sock->sock != NULL);
if (sock->in_receive == GNUNET_YES)
GNUNET_CONNECTION_receive_cancel (sock->sock);
sock->in_receive = GNUNET_NO;
}
- GNUNET_CONNECTION_destroy (sock->sock);
+ GNUNET_CONNECTION_destroy (sock->sock, finish_pending_write);
sock->sock = NULL;
if (sock->tag != NULL)
{
GNUNET_CLIENT_notify_transmit_ready_cancel (sock->th);
if (sock->receive_task != GNUNET_SCHEDULER_NO_TASK)
{
- GNUNET_SCHEDULER_cancel (sock->sched, sock->receive_task);
+ GNUNET_SCHEDULER_cancel (sock->receive_task);
sock->receive_task = GNUNET_SCHEDULER_NO_TASK;
}
GNUNET_array_grow (sock->received_buf, sock->received_size, 0);
check_complete (conn);
/* check for timeout */
remaining = GNUNET_TIME_absolute_get_remaining (conn->receive_timeout);
- if (remaining.value == 0)
+ if (remaining.rel_value == 0)
{
/* signal timeout! */
conn->receiver_handler (conn->receiver_handler_cls, NULL);
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);
sock->receive_timeout = GNUNET_TIME_relative_to_absolute (timeout);
if (GNUNET_YES == sock->msg_complete)
{
- sock->receive_task = GNUNET_SCHEDULER_add_after (sock->sched,
- GNUNET_SCHEDULER_NO_TASK,
+ sock->receive_task = GNUNET_SCHEDULER_add_after (GNUNET_SCHEDULER_NO_TASK,
&receive_task, sock);
}
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);
}
}
-/**
- * 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 GNUNET_CLIENT_Connection *sock = cls;
-
- GNUNET_CLIENT_disconnect (sock);
- if (size < sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("Failed to transmit shutdown request to client.\n"));
- return 0; /* client disconnected */
- }
- 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 should be disconnected.
- *
- * @param sock the socket connected to the service
- */
-void
-GNUNET_CLIENT_service_shutdown (struct GNUNET_CLIENT_Connection *sock)
-{
- GNUNET_CONNECTION_notify_transmit_ready (sock->sock,
- sizeof (struct
- GNUNET_MessageHeader),
- GNUNET_TIME_UNIT_FOREVER_REL,
- &write_shutdown, sock);
-}
-
-
/**
* Report service unavailable.
*/
static void
-service_test_error (struct GNUNET_SCHEDULER_Handle *s,
- GNUNET_SCHEDULER_Task task, void *task_cls)
+service_test_error (GNUNET_SCHEDULER_Task task, void *task_cls)
{
- GNUNET_SCHEDULER_add_continuation (s,
- task,
+ GNUNET_SCHEDULER_add_continuation (task,
task_cls,
GNUNET_SCHEDULER_REASON_TIMEOUT);
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received confirmation that service is running.\n");
#endif
- GNUNET_SCHEDULER_add_continuation (conn->sched,
- conn->test_cb,
+ GNUNET_SCHEDULER_add_continuation (conn->test_cb,
conn->test_cb_cls,
GNUNET_SCHEDULER_REASON_PREREQ_DONE);
}
else
{
- service_test_error (conn->sched, conn->test_cb, conn->test_cb_cls);
+ service_test_error (conn->test_cb, conn->test_cb_cls);
}
- GNUNET_CLIENT_disconnect (conn);
+ GNUNET_CLIENT_disconnect (conn, GNUNET_NO);
}
static size_t
write_test (void *cls, size_t size, void *buf)
{
+ struct GNUNET_CLIENT_Connection *conn = cls;
struct GNUNET_MessageHeader *msg;
if (size < sizeof (struct GNUNET_MessageHeader))
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
_("Failure to transmit TEST request.\n"));
#endif
+ service_test_error (conn->test_cb, conn->test_cb_cls);
+ GNUNET_CLIENT_disconnect (conn, GNUNET_NO);
return 0; /* client disconnected */
}
#if DEBUG_CLIENT
msg = (struct GNUNET_MessageHeader *) buf;
msg->type = htons (GNUNET_MESSAGE_TYPE_TEST);
msg->size = htons (sizeof (struct GNUNET_MessageHeader));
+ GNUNET_CLIENT_receive (conn,
+ &confirm_handler,
+ conn,
+ GNUNET_TIME_absolute_get_remaining (conn->test_deadline));
return sizeof (struct GNUNET_MessageHeader);
}
/**
* Wait until the service is running.
*
- * @param sched scheduler to use
* @param service name of the service to wait for
* @param cfg configuration to use
* @param timeout how long to wait at most in ms
* @param task_cls closure for task
*/
void
-GNUNET_CLIENT_service_test (struct GNUNET_SCHEDULER_Handle *sched,
- const char *service,
+GNUNET_CLIENT_service_test (const char *service,
const struct GNUNET_CONFIGURATION_Handle *cfg,
struct GNUNET_TIME_Relative timeout,
GNUNET_SCHEDULER_Task task, void *task_cls)
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Testing if service `%s' is running.\n", service);
#endif
- conn = GNUNET_CLIENT_connect (sched, service, cfg);
+ conn = GNUNET_CLIENT_connect (service, cfg);
if (conn == NULL)
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
_
("Could not connect to service `%s', must not be running.\n"),
service);
- service_test_error (sched, task, task_cls);
+ service_test_error (task, task_cls);
return;
}
conn->test_cb = task;
conn->test_cb_cls = task_cls;
- if (NULL ==
- GNUNET_CONNECTION_notify_transmit_ready (conn->sock,
- sizeof (struct
- GNUNET_MessageHeader),
- timeout, &write_test, NULL))
+ conn->test_deadline = GNUNET_TIME_relative_to_absolute (timeout);
+
+ if (NULL == GNUNET_CLIENT_notify_transmit_ready (conn,
+ sizeof (struct GNUNET_MessageHeader),
+ timeout,
+ GNUNET_YES,
+ &write_test, conn))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Failure to transmit request to service `%s'\n"),
service);
- service_test_error (sched, task, task_cls);
- GNUNET_CLIENT_disconnect (conn);
+ service_test_error (task, task_cls);
+ GNUNET_CLIENT_disconnect (conn, GNUNET_NO);
return;
}
- GNUNET_CLIENT_receive (conn, &confirm_handler, conn, timeout);
}
/**
- * Connection notifies us about failure or success of
- * a transmission request. Either pass it on to our
- * user or, if possible, retry.
+ * Connection notifies us about failure or success of a transmission
+ * request. Either pass it on to our user or, if possible, retry.
*
* @param cls our "struct GNUNET_CLIENT_TransmissionHandle"
* @param size number of bytes available for transmission
if (buf == NULL)
{
delay = GNUNET_TIME_absolute_get_remaining (th->timeout);
- delay.value /= 2;
- if ( (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & GNUNET_SCHEDULER_get_reason (th->sock->sched))) ||
+ delay.rel_value /= 2;
+ if ( (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & GNUNET_SCHEDULER_get_reason ())) ||
(GNUNET_YES != th->auto_retry) ||
(0 == --th->attempts_left) ||
- (delay.value < 1) )
+ (delay.rel_value < 1) )
{
#if DEBUG_CLIENT
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
return 0;
}
/* auto-retry */
- GNUNET_CONNECTION_destroy (th->sock->sock);
- th->sock->sock = do_connect (th->sock->sched,
- th->sock->service_name, th->sock->cfg);
+ GNUNET_CONNECTION_destroy (th->sock->sock, GNUNET_NO);
+ th->sock->sock = do_connect (th->sock->service_name,
+ th->sock->cfg,
+ th->sock->attempts++);
GNUNET_assert (NULL != th->sock->sock);
- delay = GNUNET_TIME_relative_min (delay, GNUNET_TIME_UNIT_SECONDS);
+ GNUNET_CONNECTION_ignore_shutdown (th->sock->sock,
+ th->sock->ignore_shutdown);
+ delay = GNUNET_TIME_relative_min (delay, th->sock->back_off);
+ th->sock->back_off
+ = GNUNET_TIME_relative_min (GNUNET_TIME_relative_multiply (th->sock->back_off, 2),
+ GNUNET_TIME_UNIT_SECONDS);
#if DEBUG_CLIENT
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Transmission failed %u times, trying again in %llums.\n",
MAX_ATTEMPTS - th->attempts_left,
- (unsigned long long) delay.value);
+ (unsigned long long) delay.rel_value);
#endif
- th->reconnect_task = GNUNET_SCHEDULER_add_delayed (th->sock->sched,
- delay,
+ th->reconnect_task = GNUNET_SCHEDULER_add_delayed (delay,
&client_delayed_retry,
th);
th->sock->th = th;
if (th->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
{
GNUNET_break (NULL == th->th);
- GNUNET_SCHEDULER_cancel (th->sock->sched, th->reconnect_task);
+ GNUNET_SCHEDULER_cancel (th->reconnect_task);
th->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
}
else
{
- GNUNET_break (NULL != th->th);
+ GNUNET_assert (NULL != th->th);
GNUNET_CONNECTION_notify_transmit_ready_cancel (th->th);
}
th->sock->th = NULL;
msize = ntohs (tc->hdr->size);
if (NULL == buf)
{
+#if DEBUG_CLIENT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ _("Could not submit request, not expecting to receive a response.\n"));
+#endif
tc->rn (tc->rn_cls, NULL);
GNUNET_free (tc);
return 0;
projects / oweals / gnunet.git / blobdiff