1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef h2_proxy_session_h
18 #define h2_proxy_session_h
20 #define H2_ALEN(a) (sizeof(a)/sizeof((a)[0]))
22 #include <nghttp2/nghttp2.h>
24 struct h2_proxy_iqueue;
25 struct h2_proxy_ihash_t;
30 H2_STREAM_ST_RESV_LOCAL,
31 H2_STREAM_ST_RESV_REMOTE,
32 H2_STREAM_ST_CLOSED_INPUT,
33 H2_STREAM_ST_CLOSED_OUTPUT,
35 } h2_proxy_stream_state_t;
38 H2_PROXYS_ST_INIT, /* send initial SETTINGS, etc. */
39 H2_PROXYS_ST_DONE, /* finished, connection close */
40 H2_PROXYS_ST_IDLE, /* no streams to process */
41 H2_PROXYS_ST_BUSY, /* read/write without stop */
42 H2_PROXYS_ST_WAIT, /* waiting for tasks reporting back */
43 H2_PROXYS_ST_LOCAL_SHUTDOWN, /* we announced GOAWAY */
44 H2_PROXYS_ST_REMOTE_SHUTDOWN, /* client announced GOAWAY */
48 H2_PROXYS_EV_INIT, /* session was initialized */
49 H2_PROXYS_EV_LOCAL_GOAWAY, /* we send a GOAWAY */
50 H2_PROXYS_EV_REMOTE_GOAWAY, /* remote send us a GOAWAY */
51 H2_PROXYS_EV_CONN_ERROR, /* connection error */
52 H2_PROXYS_EV_PROTO_ERROR, /* protocol error */
53 H2_PROXYS_EV_CONN_TIMEOUT, /* connection timeout */
54 H2_PROXYS_EV_NO_IO, /* nothing has been read or written */
55 H2_PROXYS_EV_STREAM_SUBMITTED, /* stream has been submitted */
56 H2_PROXYS_EV_STREAM_DONE, /* stream has been finished */
57 H2_PROXYS_EV_STREAM_RESUMED, /* stream signalled availability of headers/data */
58 H2_PROXYS_EV_DATA_READ, /* connection data has been read */
59 H2_PROXYS_EV_NGH2_DONE, /* nghttp2 wants neither read nor write anything */
60 H2_PROXYS_EV_PRE_CLOSE, /* connection will close after this */
64 typedef struct h2_proxy_session h2_proxy_session;
65 typedef void h2_proxy_request_done(h2_proxy_session *s, request_rec *r,
66 apr_status_t status, int touched);
68 struct h2_proxy_session {
71 proxy_conn_rec *p_conn;
72 proxy_server_conf *conf;
74 nghttp2_session *ngh2; /* the nghttp2 session itself */
76 unsigned int aborted : 1;
77 unsigned int check_ping : 1;
78 unsigned int h2_front : 1; /* if front-end connection is HTTP/2 */
80 h2_proxy_request_done *done;
83 unsigned char window_bits_stream;
84 unsigned char window_bits_connection;
86 h2_proxys_state state;
87 apr_interval_time_t wait_timeout;
89 struct h2_proxy_ihash_t *streams;
90 struct h2_proxy_iqueue *suspended;
91 apr_size_t remote_max_concurrent;
92 int last_stream_id; /* last stream id processed by backend, or 0 */
93 apr_time_t last_frame_received;
95 apr_bucket_brigade *input;
96 apr_bucket_brigade *output;
99 h2_proxy_session *h2_proxy_session_setup(const char *id, proxy_conn_rec *p_conn,
100 proxy_server_conf *conf,
102 unsigned char window_bits_connection,
103 unsigned char window_bits_stream,
104 h2_proxy_request_done *done);
106 apr_status_t h2_proxy_session_submit(h2_proxy_session *s, const char *url,
107 request_rec *r, int standalone);
110 * Perform a step in processing the proxy session. Will return aftert
111 * one read/write cycle and indicate session status by status code.
112 * @param s the session to process
113 * @return APR_EAGAIN when processing needs to be invoked again
114 * APR_SUCCESS when all streams have been processed, session still live
115 * APR_EOF when the session has been terminated
117 apr_status_t h2_proxy_session_process(h2_proxy_session *s);
119 void h2_proxy_session_cancel_all(h2_proxy_session *s);
121 void h2_proxy_session_cleanup(h2_proxy_session *s, h2_proxy_request_done *done);
123 void h2_proxy_session_update_window(h2_proxy_session *s,
124 conn_rec *c, apr_off_t bytes);
126 #define H2_PROXY_REQ_URL_NOTE "h2-proxy-req-url"
128 #endif /* h2_proxy_session_h */