126 lines
3.5 KiB
C++
126 lines
3.5 KiB
C++
/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2016 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_LIVE_CHECK_H
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#define SHRPX_LIVE_CHECK_H
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#include "shrpx.h"
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#include <functional>
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#include <random>
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#include <openssl/ssl.h>
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#include <ev.h>
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#include <nghttp2/nghttp2.h>
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#include "shrpx_connection.h"
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namespace shrpx {
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class Worker;
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struct DownstreamAddr;
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struct DNSQuery;
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class LiveCheck {
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public:
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LiveCheck(struct ev_loop *loop, SSL_CTX *ssl_ctx, Worker *worker,
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DownstreamAddr *addr, std::mt19937 &gen);
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~LiveCheck();
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void disconnect();
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void on_success();
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void on_failure();
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int initiate_connection();
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// Schedules next connection attempt
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void schedule();
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// Low level I/O operation callback; they are called from do_read()
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// or do_write().
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int noop();
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int connected();
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int tls_handshake();
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int read_tls();
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int write_tls();
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int read_clear();
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int write_clear();
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int do_read();
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int do_write();
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// These functions are used to feed / extract data to
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// nghttp2_session object.
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int on_read(const uint8_t *data, size_t len);
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int on_write();
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// Call this function when HTTP/2 connection was established. We
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// don't call this function for HTTP/1 at the moment.
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int connection_made();
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void start_settings_timer();
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void stop_settings_timer();
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// Call this function when SETTINGS ACK was received from server.
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void settings_ack_received();
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void signal_write();
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private:
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Connection conn_;
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DefaultMemchunks wb_;
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std::mt19937 &gen_;
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ev_timer backoff_timer_;
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ev_timer settings_timer_;
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std::function<int(LiveCheck &)> read_, write_;
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Worker *worker_;
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// nullptr if no TLS is configured
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SSL_CTX *ssl_ctx_;
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// Address of remote endpoint
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DownstreamAddr *addr_;
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nghttp2_session *session_;
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// Actual remote address used to contact backend. This is initially
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// nullptr, and may point to either &addr_->addr, or
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// resolved_addr_.get().
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const Address *raddr_;
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// Resolved IP address if dns parameter is used
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std::unique_ptr<Address> resolved_addr_;
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std::unique_ptr<DNSQuery> dns_query_;
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// The number of successful connect attempt in a row.
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size_t success_count_;
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// The number of unsuccessful connect attempt in a row.
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size_t fail_count_;
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// true when SETTINGS ACK has been received from server.
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bool settings_ack_received_;
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// true when GOAWAY has been queued.
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bool session_closing_;
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};
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} // namespace shrpx
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#endif // SHRPX_LIVE_CHECK_H
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