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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
| #include "nghttp2_ratelim.h" | ||
| #include "nghttp2_helper.h" | ||
|
|
||
| void nghttp2_ratelim_init(nghttp2_ratelim *rl, uint64_t burst, uint64_t rate) { | ||
| rl->val = rl->burst = burst; | ||
| rl->rate = rate; | ||
| rl->tstamp = 0; | ||
| } | ||
|
|
||
| void nghttp2_ratelim_update(nghttp2_ratelim *rl, uint64_t tstamp) { | ||
| uint64_t d, gain; | ||
|
|
||
| if (tstamp == rl->tstamp) { | ||
| return; | ||
| } | ||
|
|
||
| if (tstamp > rl->tstamp) { | ||
| d = tstamp - rl->tstamp; | ||
| } else { | ||
| d = 1; | ||
| } | ||
|
|
||
| rl->tstamp = tstamp; | ||
|
|
||
| if (UINT64_MAX / d < rl->rate) { | ||
| rl->val = rl->burst; | ||
|
|
||
| return; | ||
| } | ||
|
|
||
| gain = rl->rate * d; | ||
|
|
||
| if (UINT64_MAX - gain < rl->val) { | ||
| rl->val = rl->burst; | ||
|
|
||
| return; | ||
| } | ||
|
|
||
| rl->val += gain; | ||
| rl->val = nghttp2_min(rl->val, rl->burst); | ||
| } | ||
|
|
||
| int nghttp2_ratelim_drain(nghttp2_ratelim *rl, uint64_t n) { | ||
| if (rl->val < n) { | ||
| return -1; | ||
| } | ||
|
|
||
| rl->val -= n; | ||
|
|
||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| /* | ||
| * 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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