99 lines
2.4 KiB
C++
99 lines
2.4 KiB
C++
/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2015 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "shrpx_rate_limit.h"
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#include <limits>
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namespace shrpx {
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namespace {
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void regencb(struct ev_loop *loop, ev_timer *w, int revents) {
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auto r = static_cast<RateLimit *>(w->data);
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r->regen();
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}
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} // namespace
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RateLimit::RateLimit(struct ev_loop *loop, ev_io *w, size_t rate, size_t burst)
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: w_(w), loop_(loop), rate_(rate), burst_(burst), avail_(burst),
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startw_req_(false) {
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ev_timer_init(&t_, regencb, 0., 1.);
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t_.data = this;
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if (rate_ > 0) {
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ev_timer_again(loop_, &t_);
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}
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}
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RateLimit::~RateLimit() {
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ev_timer_stop(loop_, &t_);
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}
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size_t RateLimit::avail() const {
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if (rate_ == 0) {
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return std::numeric_limits<ssize_t>::max();
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}
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return avail_;
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}
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void RateLimit::drain(size_t n) {
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if (rate_ == 0) {
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return;
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}
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n = std::min(avail_, n);
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avail_ -= n;
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if (avail_ == 0) {
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ev_io_stop(loop_, w_);
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}
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}
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void RateLimit::regen() {
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if (rate_ == 0) {
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return;
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}
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if (avail_ + rate_ > burst_) {
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avail_ = burst_;
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} else {
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avail_ += rate_;
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}
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if (avail_ > 0 && startw_req_) {
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ev_io_start(loop_, w_);
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}
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}
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void RateLimit::startw() {
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startw_req_ = true;
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if (rate_ == 0 || avail_ > 0) {
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ev_io_start(loop_, w_);
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return;
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}
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}
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void RateLimit::stopw() {
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startw_req_ = false;
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ev_io_stop(loop_, w_);
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}
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} // namespace shrpx
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