2 * nghttp2 - HTTP/2 C Library
4 * Copyright (c) 2014 Tatsuhiro Tsujikawa
6 * Permission is hereby granted, free of charge, to any person obtaining
7 * a copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sublicense, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 #include "shrpx_connect_blocker.h"
30 const ev_tstamp INITIAL_SLEEP = 2.;
34 void connect_blocker_cb(struct ev_loop *loop, ev_timer *w, int revents) {
35 if (LOG_ENABLED(INFO)) {
36 LOG(INFO) << "unblock downstream connection";
41 ConnectBlocker::ConnectBlocker(struct ev_loop *loop)
42 : loop_(loop), sleep_(INITIAL_SLEEP) {
43 ev_timer_init(&timer_, connect_blocker_cb, 0., 0.);
46 ConnectBlocker::~ConnectBlocker() { ev_timer_stop(loop_, &timer_); }
48 bool ConnectBlocker::blocked() const { return ev_is_active(&timer_); }
50 void ConnectBlocker::on_success() { sleep_ = INITIAL_SLEEP; }
52 void ConnectBlocker::on_failure() {
53 if (ev_is_active(&timer_)) {
57 sleep_ = std::min(128., sleep_ * 2);
59 LOG(WARN) << "connect failure, start sleeping " << sleep_;
61 ev_timer_set(&timer_, sleep_, 0.);
62 ev_timer_start(loop_, &timer_);