nghttp2/src/shrpx_http2_session.h

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/*
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* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2012 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_HTTP2_SESSION_H
#define SHRPX_HTTP2_SESSION_H
#include "shrpx.h"
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#include <unordered_set>
#include <memory>
#include <openssl/ssl.h>
#include <ev.h>
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#include <nghttp2/nghttp2.h>
#include "http-parser/http_parser.h"
#include "shrpx_connection.h"
#include "buffer.h"
#include "template.h"
using namespace nghttp2;
namespace shrpx {
class Http2DownstreamConnection;
class Worker;
class ConnectBlocker;
struct StreamData {
StreamData *dlnext, *dlprev;
Http2DownstreamConnection *dconn;
};
class Http2Session {
public:
Http2Session(struct ev_loop *loop, SSL_CTX *ssl_ctx,
ConnectBlocker *connect_blocker, Worker *worker, size_t group,
size_t idx);
~Http2Session();
int check_cert();
// If hard is true, all pending requests are abandoned and
// associated ClientHandlers will be deleted.
int disconnect(bool hard = false);
int initiate_connection();
void add_downstream_connection(Http2DownstreamConnection *dconn);
void remove_downstream_connection(Http2DownstreamConnection *dconn);
void remove_stream_data(StreamData *sd);
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int submit_request(Http2DownstreamConnection *dconn, int32_t pri,
const nghttp2_nv *nva, size_t nvlen,
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const nghttp2_data_provider *data_prd);
int submit_rst_stream(int32_t stream_id, uint32_t error_code);
int submit_priority(Http2DownstreamConnection *dconn, int32_t pri);
int terminate_session(uint32_t error_code);
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nghttp2_session *get_session() const;
bool get_flow_control() const;
int resume_data(Http2DownstreamConnection *dconn);
int connection_made();
int do_read();
int do_write();
int on_read();
int on_write();
int connected();
int read_clear();
int write_clear();
int tls_handshake();
int read_tls();
int write_tls();
int downstream_read_proxy();
int downstream_connect_proxy();
int downstream_read();
int downstream_write();
int noop();
void signal_write();
struct ev_loop *get_loop() const;
ev_io *get_wev();
int get_state() const;
void set_state(int state);
void start_settings_timer();
void stop_settings_timer();
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SSL *get_ssl() const;
int consume(int32_t stream_id, size_t len);
// Returns true if request can be issued on downstream connection.
bool can_push_request() const;
// Initiates the connection checking if downstream connection has
// been established and connection checking is required.
void start_checking_connection();
// Resets connection check timer to timeout |t|. After timeout, we
// require connection checking. If connection checking is already
// enabled, this timeout is for PING ACK timeout.
void reset_connection_check_timer(ev_tstamp t);
void reset_connection_check_timer_if_not_checking();
// Signals that connection is alive. Internally
// reset_connection_check_timer() is called.
void connection_alive();
// Change connection check state.
void set_connection_check_state(int state);
int get_connection_check_state() const;
bool should_hard_fail() const;
void submit_pending_requests();
size_t get_addr_idx() const;
size_t get_group() const;
size_t get_index() const;
enum {
// Disconnected
DISCONNECTED,
// Connecting proxy and making CONNECT request
PROXY_CONNECTING,
// Tunnel is established with proxy
PROXY_CONNECTED,
// Establishing tunnel is failed
PROXY_FAILED,
// Connecting to downstream and/or performing SSL/TLS handshake
CONNECTING,
// Connected to downstream
CONNECTED,
// Connection is started to fail
CONNECT_FAILING,
};
enum {
// Connection checking is not required
CONNECTION_CHECK_NONE,
// Connection checking is required
CONNECTION_CHECK_REQUIRED,
// Connection checking has been started
CONNECTION_CHECK_STARTED
};
using ReadBuf = Buffer<8_k>;
using WriteBuf = Buffer<32768>;
private:
Connection conn_;
ev_timer settings_timer_;
// This timer has 2 purpose: when it first timeout, set
// connection_check_state_ = CONNECTION_CHECK_REQUIRED. After
// connection check has started, this timer is started again and
// traps PING ACK timeout.
ev_timer connchk_timer_;
DList<Http2DownstreamConnection> dconns_;
DList<StreamData> streams_;
std::function<int(Http2Session &)> read_, write_;
std::function<int(Http2Session &)> on_read_, on_write_;
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// Used to parse the response from HTTP proxy
std::unique_ptr<http_parser> proxy_htp_;
Worker *worker_;
ConnectBlocker *connect_blocker_;
// NULL if no TLS is configured
SSL_CTX *ssl_ctx_;
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nghttp2_session *session_;
const uint8_t *data_pending_;
size_t data_pendinglen_;
// index of get_config()->downstream_addrs this object uses
size_t addr_idx_;
size_t group_;
// index inside group, this is used to pin frontend to certain
// HTTP/2 backend for better throughput.
size_t index_;
int state_;
int connection_check_state_;
bool flow_control_;
WriteBuf wb_;
ReadBuf rb_;
};
nghttp2_session_callbacks *create_http2_downstream_callbacks();
} // namespace shrpx
#endif // SHRPX_HTTP2_SESSION_H