#include "gnunet_server_lib.h"
#include "gnunet_scheduler_lib.h"
-#define DEBUG_CLIENT GNUNET_NO
+#define DEBUG_CLIENT GNUNET_YES
/**
* How often do we re-try tranmsitting requests before giving up?
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
}
-/**
- * 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_WARNING,
- _("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.
*/
projects / oweals / gnunet.git / blobdiff