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isc
ratelimiter.h
/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef ISC_RATELIMITER_H #define ISC_RATELIMITER_H 1 /***** ***** Module Info *****/ /*! \file isc/ratelimiter.h * \brief A rate limiter is a mechanism for dispatching events at a limited * rate. This is intended to be used when sending zone maintenance * SOA queries, NOTIFY messages, etc. */ /*** *** Imports. ***/ #include <inttypes.h> #include <stdbool.h> #include <isc/lang.h> #include <isc/types.h> ISC_LANG_BEGINDECLS /***** ***** Functions. *****/ isc_result_t isc_ratelimiter_create(isc_mem_t *mctx, isc_timermgr_t *timermgr, isc_task_t *task, isc_ratelimiter_t **ratelimiterp); /*%< * Create a rate limiter. The execution interval is initially undefined. */ isc_result_t isc_ratelimiter_setinterval(isc_ratelimiter_t *rl, isc_interval_t *interval); /*!< * Set the minimum interval between event executions. * The interval value is copied, so the caller need not preserve it. * * Requires: * '*interval' is a nonzero interval. */ void isc_ratelimiter_setpertic(isc_ratelimiter_t *rl, uint32_t perint); /*%< * Set the number of events processed per interval timer tick. * If 'perint' is zero it is treated as 1. */ void isc_ratelimiter_setpushpop(isc_ratelimiter_t *rl, bool pushpop); /*%< * Set / clear the ratelimiter to from push pop mode rather * first in - first out mode (default). */ isc_result_t isc_ratelimiter_enqueue(isc_ratelimiter_t *rl, isc_task_t *task, isc_event_t **eventp); /*%< * Queue an event for rate-limited execution. * * This is similar * to doing an isc_task_send() to the 'task', except that the * execution may be delayed to achieve the desired rate of * execution. * * '(*eventp)->ev_sender' is used to hold the task. The caller * must ensure that the task exists until the event is delivered. * * Requires: *\li An interval has been set by calling * isc_ratelimiter_setinterval(). * *\li 'task' to be non NULL. *\li '(*eventp)->ev_sender' to be NULL. */ isc_result_t isc_ratelimiter_dequeue(isc_ratelimiter_t *rl, isc_event_t *event); /* * Dequeue a event off the ratelimiter queue. * * Returns: * \li ISC_R_NOTFOUND if the event is no longer linked to the rate limiter. * \li ISC_R_SUCCESS */ void isc_ratelimiter_shutdown(isc_ratelimiter_t *ratelimiter); /*%< * Shut down a rate limiter. * * Ensures: *\li All events that have not yet been * dispatched to the task are dispatched immediately with * the #ISC_EVENTATTR_CANCELED bit set in ev_attributes. * *\li Further attempts to enqueue events will fail with * #ISC_R_SHUTTINGDOWN. * *\li The rate limiter is no longer attached to its task. */ void isc_ratelimiter_attach(isc_ratelimiter_t *source, isc_ratelimiter_t **target); /*%< * Attach to a rate limiter. */ void isc_ratelimiter_detach(isc_ratelimiter_t **ratelimiterp); /*%< * Detach from a rate limiter. */ isc_result_t isc_ratelimiter_stall(isc_ratelimiter_t *rl); /*%< * Stall event processing. */ isc_result_t isc_ratelimiter_release(isc_ratelimiter_t *rl); /*%< * Release a stalled rate limiter. */ ISC_LANG_ENDDECLS #endif /* ISC_RATELIMITER_H */
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