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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2023 nghttp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef NGHTTP2_RATELIM_H
#define NGHTTP2_RATELIM_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <nghttp2/nghttp2.h>
typedef struct nghttp2_ratelim {
/* burst is the maximum value of val. */
uint64_t burst;
/* rate is the amount of value that is regenerated per 1 tstamp. */
uint64_t rate;
/* val is the amount of value available to drain. */
uint64_t val;
/* tstamp is the last timestamp in second resolution that is known
to this object. */
uint64_t tstamp;
} nghttp2_ratelim;
/* nghttp2_ratelim_init initializes |rl| with the given parameters. */
void nghttp2_ratelim_init(nghttp2_ratelim *rl, uint64_t burst, uint64_t rate);
/* nghttp2_ratelim_update updates rl->val with the current |tstamp|
given in second resolution. */
void nghttp2_ratelim_update(nghttp2_ratelim *rl, uint64_t tstamp);
/* nghttp2_ratelim_drain drains |n| from rl->val. It returns 0 if it
succeeds, or -1. */
int nghttp2_ratelim_drain(nghttp2_ratelim *rl, uint64_t n);
#endif /* NGHTTP2_RATELIM_H */
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