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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2016 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef SHRPX_LIVE_CHECK_H
#define SHRPX_LIVE_CHECK_H
#include "shrpx.h"
#include <functional>
#include <random>
#include <openssl/ssl.h>
#include <ev.h>
#include <nghttp2/nghttp2.h>
#include "shrpx_connection.h"
namespace shrpx {
class Worker;
struct DownstreamAddr;
struct DNSQuery;
class LiveCheck {
public:
LiveCheck(struct ev_loop *loop, SSL_CTX *ssl_ctx, Worker *worker,
DownstreamAddr *addr, std::mt19937 &gen);
~LiveCheck();
void disconnect();
void on_success();
void on_failure();
int initiate_connection();
// Schedules next connection attempt
void schedule();
// Low level I/O operation callback; they are called from do_read()
// or do_write().
int noop();
int connected();
int tls_handshake();
int read_tls();
int write_tls();
int read_clear();
int write_clear();
int do_read();
int do_write();
// These functions are used to feed / extract data to
// nghttp2_session object.
int on_read(const uint8_t *data, size_t len);
int on_write();
// Call this function when HTTP/2 connection was established. We
// don't call this function for HTTP/1 at the moment.
int connection_made();
void start_settings_timer();
void stop_settings_timer();
// Call this function when SETTINGS ACK was received from server.
void settings_ack_received();
void signal_write();
private:
Connection conn_;
DefaultMemchunks wb_;
std::mt19937 &gen_;
ev_timer backoff_timer_;
ev_timer settings_timer_;
std::function<int(LiveCheck &)> read_, write_;
Worker *worker_;
// nullptr if no TLS is configured
SSL_CTX *ssl_ctx_;
// Address of remote endpoint
DownstreamAddr *addr_;
nghttp2_session *session_;
// Actual remote address used to contact backend. This is initially
// nullptr, and may point to either &addr_->addr, or
// resolved_addr_.get().
const Address *raddr_;
// Resolved IP address if dns parameter is used
std::unique_ptr<Address> resolved_addr_;
std::unique_ptr<DNSQuery> dns_query_;
// The number of successful connect attempt in a row.
size_t success_count_;
// The number of unsuccessful connect attempt in a row.
size_t fail_count_;
// true when SETTINGS ACK has been received from server.
bool settings_ack_received_;
// true when GOAWAY has been queued.
bool session_closing_;
};
} // namespace shrpx
#endif // SHRPX_LIVE_CHECK_H
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