286 lines
8.6 KiB
C++
286 lines
8.6 KiB
C++
/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2012 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_HTTP2_SESSION_H
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#define SHRPX_HTTP2_SESSION_H
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#include "shrpx.h"
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#include <unordered_set>
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#include <memory>
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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 "http-parser/http_parser.h"
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#include "shrpx_connection.h"
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#include "buffer.h"
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#include "template.h"
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using namespace nghttp2;
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namespace shrpx {
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class Http2DownstreamConnection;
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class Worker;
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struct DownstreamAddrGroup;
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struct DownstreamAddr;
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struct DNSQuery;
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struct StreamData {
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StreamData *dlnext, *dlprev;
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Http2DownstreamConnection *dconn;
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};
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enum FreelistZone {
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// Http2Session object is not linked in any freelist.
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FREELIST_ZONE_NONE,
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// Http2Session object is linked in group scope
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// http2_avail_freelist.
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FREELIST_ZONE_AVAIL,
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// Http2Session object is linked in address scope
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// http2_extra_freelist.
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FREELIST_ZONE_EXTRA,
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// Http2Session object is about to be deleted, and it does not
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// belong to any linked list.
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FREELIST_ZONE_GONE
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};
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class Http2Session {
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public:
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Http2Session(struct ev_loop *loop, SSL_CTX *ssl_ctx, Worker *worker,
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const std::shared_ptr<DownstreamAddrGroup> &group,
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DownstreamAddr *addr);
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~Http2Session();
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// If hard is true, all pending requests are abandoned and
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// associated ClientHandlers will be deleted.
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int disconnect(bool hard = false);
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int initiate_connection();
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int resolve_name();
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void add_downstream_connection(Http2DownstreamConnection *dconn);
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void remove_downstream_connection(Http2DownstreamConnection *dconn);
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void remove_stream_data(StreamData *sd);
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int submit_request(Http2DownstreamConnection *dconn, const nghttp2_nv *nva,
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size_t nvlen, const nghttp2_data_provider *data_prd);
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int submit_rst_stream(int32_t stream_id, uint32_t error_code);
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int terminate_session(uint32_t error_code);
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nghttp2_session *get_session() const;
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int resume_data(Http2DownstreamConnection *dconn);
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int connection_made();
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int do_read();
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int do_write();
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int on_read(const uint8_t *data, size_t datalen);
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int on_write();
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int connected();
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int read_clear();
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int write_clear();
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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 downstream_read_proxy(const uint8_t *data, size_t datalen);
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int downstream_connect_proxy();
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int downstream_read(const uint8_t *data, size_t datalen);
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int downstream_write();
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int noop();
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int read_noop(const uint8_t *data, size_t datalen);
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int write_noop();
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void signal_write();
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struct ev_loop *get_loop() const;
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ev_io *get_wev();
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int get_state() const;
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void set_state(int state);
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void start_settings_timer();
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void stop_settings_timer();
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SSL *get_ssl() const;
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int consume(int32_t stream_id, size_t len);
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// Returns true if request can be issued on downstream connection.
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bool can_push_request() const;
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// Initiates the connection checking if downstream connection has
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// been established and connection checking is required.
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void start_checking_connection();
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// Resets connection check timer to timeout |t|. After timeout, we
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// require connection checking. If connection checking is already
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// enabled, this timeout is for PING ACK timeout.
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void reset_connection_check_timer(ev_tstamp t);
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void reset_connection_check_timer_if_not_checking();
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// Signals that connection is alive. Internally
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// reset_connection_check_timer() is called.
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void connection_alive();
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// Change connection check state.
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void set_connection_check_state(int state);
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int get_connection_check_state() const;
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bool should_hard_fail() const;
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void submit_pending_requests();
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DownstreamAddr *get_addr() const;
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const std::shared_ptr<DownstreamAddrGroup> &get_downstream_addr_group() const;
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int handle_downstream_push_promise(Downstream *downstream,
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int32_t promised_stream_id);
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int handle_downstream_push_promise_complete(Downstream *downstream,
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Downstream *promised_downstream);
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// Returns number of downstream connections, including pushed
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// streams.
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size_t get_num_dconns() const;
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// Adds to group scope http2_avail_freelist.
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void add_to_avail_freelist();
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// Adds to address scope http2_extra_freelist.
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void add_to_extra_freelist();
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// Removes this object from any freelist. If this object is not
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// linked from any freelist, this function does nothing.
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void remove_from_freelist();
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// Removes this object form any freelist, and marks this object as
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// not schedulable.
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void exclude_from_scheduling();
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// Returns true if the maximum concurrency is reached. In other
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// words, the number of currently participated streams in this
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// session is equal or greater than the max concurrent streams limit
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// advertised by server. If |extra| is nonzero, it is added to the
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// number of current concurrent streams when comparing against
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// server initiated concurrency limit.
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bool max_concurrency_reached(size_t extra = 0) const;
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DefaultMemchunks *get_request_buf();
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void on_timeout();
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// This is called periodically using ev_prepare watcher, and if
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// group_ is retired (backend has been replaced), send GOAWAY to
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// shutdown the connection.
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void check_retire();
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// Returns address used to connect to backend. Could be nullptr.
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const Address *get_raddr() const;
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enum {
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// Disconnected
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DISCONNECTED,
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// Connecting proxy and making CONNECT request
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PROXY_CONNECTING,
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// Tunnel is established with proxy
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PROXY_CONNECTED,
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// Establishing tunnel is failed
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PROXY_FAILED,
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// Connecting to downstream and/or performing SSL/TLS handshake
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CONNECTING,
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// Connected to downstream
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CONNECTED,
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// Connection is started to fail
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CONNECT_FAILING,
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// Resolving host name
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RESOLVING_NAME,
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};
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enum {
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// Connection checking is not required
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CONNECTION_CHECK_NONE,
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// Connection checking is required
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CONNECTION_CHECK_REQUIRED,
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// Connection checking has been started
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CONNECTION_CHECK_STARTED
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};
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using ReadBuf = Buffer<8_k>;
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Http2Session *dlnext, *dlprev;
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private:
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Connection conn_;
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DefaultMemchunks wb_;
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ev_timer settings_timer_;
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// This timer has 2 purpose: when it first timeout, set
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// connection_check_state_ = CONNECTION_CHECK_REQUIRED. After
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// connection check has started, this timer is started again and
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// traps PING ACK timeout.
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ev_timer connchk_timer_;
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// timer to initiate connection. usually, this fires immediately.
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ev_timer initiate_connection_timer_;
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ev_prepare prep_;
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DList<Http2DownstreamConnection> dconns_;
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DList<StreamData> streams_;
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std::function<int(Http2Session &)> read_, write_;
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std::function<int(Http2Session &, const uint8_t *, size_t)> on_read_;
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std::function<int(Http2Session &)> on_write_;
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// Used to parse the response from HTTP proxy
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std::unique_ptr<http_parser> proxy_htp_;
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Worker *worker_;
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// NULL if no TLS is configured
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SSL_CTX *ssl_ctx_;
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std::shared_ptr<DownstreamAddrGroup> group_;
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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,
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// resolved_addr_.get(), or HTTP proxy's address structure.
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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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int state_;
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int connection_check_state_;
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int freelist_zone_;
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};
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nghttp2_session_callbacks *create_http2_downstream_callbacks();
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} // namespace shrpx
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#endif // SHRPX_HTTP2_SESSION_H
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