From f6bad19e765e73886a1e5b6d32f0a7551e5757ba Mon Sep 17 00:00:00 2001 From: Christian Grothoff Date: Tue, 11 May 2010 13:16:00 +0000 Subject: moving code where it belongs: --- src/arm/arm_api.c | 206 +++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 205 insertions(+), 1 deletion(-) (limited to 'src/arm/arm_api.c') diff --git a/src/arm/arm_api.c b/src/arm/arm_api.c index ee53fd87b..f15c9ab53 100644 --- a/src/arm/arm_api.c +++ b/src/arm/arm_api.c @@ -64,6 +64,206 @@ struct GNUNET_ARM_Handle }; +/** + * 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; + +}; + +/** + * Handler receiving response to service shutdown requests. + * First call with NULL: service misbehaving, or something. + * First call with GNUNET_MESSAGE_TYPE_ARM_SHUTDOWN_ACK: + * - service will shutdown + * 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_ARM_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; + 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_ARM_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 + * + */ +static void +arm_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_CLIENT_notify_transmit_ready (sock, + sizeof (struct + GNUNET_MessageHeader), + timeout, + GNUNET_NO, + &write_shutdown, shutdown_ctx); +} + + /** * Setup a context for communicating with ARM. Note that this * can be done even if the ARM service is not yet running. @@ -498,7 +698,7 @@ GNUNET_ARM_stop_service (struct GNUNET_ARM_Handle *h, arm_shutdown_ctx = GNUNET_malloc(sizeof(struct ARM_ShutdownContext)); arm_shutdown_ctx->cb = cb; arm_shutdown_ctx->cb_cls = cb_cls; - GNUNET_CLIENT_service_shutdown (h->sched, h->client, timeout, &arm_shutdown_callback, arm_shutdown_ctx); + arm_service_shutdown (h->sched, h->client, timeout, &arm_shutdown_callback, arm_shutdown_ctx); h->client = NULL; return; } @@ -669,4 +869,8 @@ GNUNET_ARM_stop_services (const struct GNUNET_CONFIGURATION_Handle *cfg, } + + + + /* end of arm_api.c */ -- cgit v1.2.3