93 lines
2.2 KiB
C++
93 lines
2.2 KiB
C++
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/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2014 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_connect_blocker.h"
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namespace shrpx {
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namespace {
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const int INITIAL_SLEEP = 2;
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} // namespace
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ConnectBlocker::ConnectBlocker()
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: timerev_(nullptr),
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sleep_(INITIAL_SLEEP)
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{}
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ConnectBlocker::~ConnectBlocker()
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{
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if(timerev_) {
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event_free(timerev_);
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}
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}
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namespace {
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void connect_blocker_cb(evutil_socket_t sig, short events, void *arg)
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{
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if(LOG_ENABLED(INFO)) {
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LOG(INFO) << "unblock downstream connection";
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}
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}
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} // namespace
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int ConnectBlocker::init(event_base *evbase)
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{
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timerev_ = evtimer_new(evbase, connect_blocker_cb, this);
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if(timerev_ == nullptr) {
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return -1;
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}
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return 0;
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}
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bool ConnectBlocker::blocked() const
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{
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return evtimer_pending(timerev_, nullptr);
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}
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void ConnectBlocker::on_success()
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{
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sleep_ = INITIAL_SLEEP;
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}
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void ConnectBlocker::on_failure()
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{
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int rv;
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sleep_ = std::min(128, sleep_ * 2);
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LOG(WARNING) << "connect failure, start sleeping " << sleep_;
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timeval t = {sleep_, 0};
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rv = evtimer_add(timerev_, &t);
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if(rv == -1) {
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LOG(ERROR) << "evtimer_add for ConnectBlocker timerev_ failed";
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}
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}
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} // namespace shrpx
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