src/shrpx_http2_upstream.h

   1 /*
   2  * nghttp2 - HTTP/2 C Library
   3  *
   4  * Copyright (c) 2012 Tatsuhiro Tsujikawa
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining
   7  * a copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sublicense, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be
  15  * included in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25 #ifndef SHRPX_HTTP2_UPSTREAM_H
  26 #define SHRPX_HTTP2_UPSTREAM_H
  27
  28 #include "shrpx.h"
  29
  30 #include <memory>
  31
  32 #include <ev.h>
  33
  34 #include <nghttp2/nghttp2.h>
  35
  36 #include "shrpx_upstream.h"
  37 #include "shrpx_downstream_queue.h"
  38 #include "memchunk.h"
  39
  40 using namespace nghttp2;
  41
  42 namespace shrpx {
  43
  44 class ClientHandler;
  45 class HttpsUpstream;
  46
  47 class Http2Upstream : public Upstream {
  48 public:
  49   Http2Upstream(ClientHandler *handler);
  50   virtual ~Http2Upstream();
  51   virtual int on_read();
  52   virtual int on_write();
  53   virtual int on_timeout(Downstream *downstream);
  54   virtual int on_downstream_abort_request(Downstream *downstream,
  55                                           unsigned int status_code);
  56   virtual ClientHandler *get_client_handler() const;
  57
  58   virtual int downstream_read(DownstreamConnection *dconn);
  59   virtual int downstream_write(DownstreamConnection *dconn);
  60   virtual int downstream_eof(DownstreamConnection *dconn);
  61   virtual int downstream_error(DownstreamConnection *dconn, int events);
  62
  63   void add_pending_downstream(std::unique_ptr<Downstream> downstream);
  64   void remove_downstream(Downstream *downstream);
  65
  66   int rst_stream(Downstream *downstream, uint32_t error_code);
  67   int terminate_session(uint32_t error_code);
  68   int error_reply(Downstream *downstream, unsigned int status_code);
  69
  70   virtual void pause_read(IOCtrlReason reason);
  71   virtual int resume_read(IOCtrlReason reason, Downstream *downstream,
  72                           size_t consumed);
  73
  74   virtual int on_downstream_header_complete(Downstream *downstream);
  75   virtual int on_downstream_body(Downstream *downstream, const uint8_t *data,
  76                                  size_t len, bool flush);
  77   virtual int on_downstream_body_complete(Downstream *downstream);
  78
  79   virtual void on_handler_delete();
  80   virtual int on_downstream_reset(bool no_retry);
  81
  82   bool get_flow_control() const;
  83   // Perform HTTP/2 upgrade from |upstream|. On success, this object
  84   // takes ownership of the |upstream|. This function returns 0 if it
  85   // succeeds, or -1.
  86   int upgrade_upstream(HttpsUpstream *upstream);
  87   void start_settings_timer();
  88   void stop_settings_timer();
  89   int consume(int32_t stream_id, size_t len);
  90   void log_response_headers(Downstream *downstream,
  91                             const std::vector<nghttp2_nv> &nva) const;
  92   void start_downstream(Downstream *downstream);
  93   void initiate_downstream(Downstream *downstream);
  94
  95   void submit_goaway();
  96   void check_shutdown();
  97
  98   int prepare_push_promise(Downstream *downstream);
  99   int submit_push_promise(const std::string &path, Downstream *downstream);
 100
 101   int on_request_headers(Downstream *downstream, const nghttp2_frame *frame);
 102
 103 private:
 104   std::unique_ptr<HttpsUpstream> pre_upstream_;
 105   DownstreamQueue downstream_queue_;
 106   ev_timer settings_timer_;
 107   ev_timer shutdown_timer_;
 108   ev_prepare prep_;
 109   ClientHandler *handler_;
 110   nghttp2_session *session_;
 111   const uint8_t *data_pending_;
 112   size_t data_pendinglen_;
 113   bool flow_control_;
 114   bool shutdown_handled_;
 115 };
 116
 117 nghttp2_session_callbacks *create_http2_upstream_callbacks();
 118
 119 } // namespace shrpx
 120
 121 #endif // SHRPX_HTTP2_UPSTREAM_H