87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
/*
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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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#ifndef SHRPX_CONNECT_BLOCKER_H
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#define SHRPX_CONNECT_BLOCKER_H
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#include "shrpx.h"
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#include <random>
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#include <functional>
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#include <ev.h>
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namespace shrpx {
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class ConnectBlocker {
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public:
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ConnectBlocker(std::mt19937 &gen, struct ev_loop *loop,
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std::function<void()> block_func,
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std::function<void()> unblock_func);
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~ConnectBlocker();
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// Returns true if making connection is not allowed.
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bool blocked() const;
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// Call this function if connect operation succeeded. This will
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// reset sleep_ to minimum value.
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void on_success();
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// Call this function if connect operations failed. This will start
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// timer and blocks connection establishment with exponential
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// backoff.
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void on_failure();
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size_t get_fail_count() const;
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// Peer is now considered offline. This effectively means that the
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// connection is blocked until online() is called.
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void offline();
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// Peer is now considered online
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void online();
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// Returns true if peer is considered offline.
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bool in_offline() const;
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void call_block_func();
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void call_unblock_func();
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private:
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std::mt19937 &gen_;
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// Called when blocking is started
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std::function<void()> block_func_;
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// Called when unblocked
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std::function<void()> unblock_func_;
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ev_timer timer_;
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struct ev_loop *loop_;
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// The number of consecutive connection failure. Reset to 0 on
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// success.
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size_t fail_count_;
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// true if peer is considered offline.
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bool offline_;
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};
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} // namespace shrpx
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#endif // SHRPX_CONNECT_BLOCKER_H
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