diff options
Diffstat (limited to 'modules/http2/h2_proxy_session.h')
| -rw-r--r-- | modules/http2/h2_proxy_session.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/modules/http2/h2_proxy_session.h b/modules/http2/h2_proxy_session.h new file mode 100644 index 0000000..f40e5ee --- /dev/null +++ b/modules/http2/h2_proxy_session.h @@ -0,0 +1,133 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef h2_proxy_session_h +#define h2_proxy_session_h + +#define H2_ALEN(a) (sizeof(a)/sizeof((a)[0])) + +#include <nghttp2/nghttp2.h> + +struct h2_proxy_iqueue; +struct h2_proxy_ihash_t; + +typedef enum { + H2_STREAM_ST_IDLE, + H2_STREAM_ST_OPEN, + H2_STREAM_ST_RESV_LOCAL, + H2_STREAM_ST_RESV_REMOTE, + H2_STREAM_ST_CLOSED_INPUT, + H2_STREAM_ST_CLOSED_OUTPUT, + H2_STREAM_ST_CLOSED, +} h2_proxy_stream_state_t; + +typedef enum { + H2_PROXYS_ST_INIT, /* send initial SETTINGS, etc. */ + H2_PROXYS_ST_DONE, /* finished, connection close */ + H2_PROXYS_ST_IDLE, /* no streams to process */ + H2_PROXYS_ST_BUSY, /* read/write without stop */ + H2_PROXYS_ST_WAIT, /* waiting for tasks reporting back */ + H2_PROXYS_ST_LOCAL_SHUTDOWN, /* we announced GOAWAY */ + H2_PROXYS_ST_REMOTE_SHUTDOWN, /* client announced GOAWAY */ +} h2_proxys_state; + +typedef enum { + H2_PROXYS_EV_INIT, /* session was initialized */ + H2_PROXYS_EV_LOCAL_GOAWAY, /* we send a GOAWAY */ + H2_PROXYS_EV_REMOTE_GOAWAY, /* remote send us a GOAWAY */ + H2_PROXYS_EV_CONN_ERROR, /* connection error */ + H2_PROXYS_EV_PROTO_ERROR, /* protocol error */ + H2_PROXYS_EV_CONN_TIMEOUT, /* connection timeout */ + H2_PROXYS_EV_NO_IO, /* nothing has been read or written */ + H2_PROXYS_EV_STREAM_SUBMITTED, /* stream has been submitted */ + H2_PROXYS_EV_STREAM_DONE, /* stream has been finished */ + H2_PROXYS_EV_STREAM_RESUMED, /* stream signalled availability of headers/data */ + H2_PROXYS_EV_DATA_READ, /* connection data has been read */ + H2_PROXYS_EV_NGH2_DONE, /* nghttp2 wants neither read nor write anything */ + H2_PROXYS_EV_PRE_CLOSE, /* connection will close after this */ +} h2_proxys_event_t; + +typedef enum { + H2_PING_ST_NONE, /* normal connection mode, ProxyTimeout rules */ + H2_PING_ST_AWAIT_ANY, /* waiting for any frame from backend */ + H2_PING_ST_AWAIT_PING, /* waiting for PING frame from backend */ +} h2_ping_state_t; + +typedef struct h2_proxy_session h2_proxy_session; +typedef void h2_proxy_request_done(h2_proxy_session *s, request_rec *r, + apr_status_t status, int touched); + +struct h2_proxy_session { + const char *id; + conn_rec *c; + proxy_conn_rec *p_conn; + proxy_server_conf *conf; + apr_pool_t *pool; + nghttp2_session *ngh2; /* the nghttp2 session itself */ + + unsigned int aborted : 1; + unsigned int h2_front : 1; /* if front-end connection is HTTP/2 */ + + h2_proxy_request_done *done; + void *user_data; + + unsigned char window_bits_stream; + unsigned char window_bits_connection; + + h2_proxys_state state; + apr_interval_time_t wait_timeout; + + struct h2_proxy_ihash_t *streams; + struct h2_proxy_iqueue *suspended; + apr_size_t remote_max_concurrent; + int last_stream_id; /* last stream id processed by backend, or 0 */ + apr_time_t last_frame_received; + + apr_bucket_brigade *input; + apr_bucket_brigade *output; + + h2_ping_state_t ping_state; + apr_time_t ping_timeout; + apr_time_t save_timeout; +}; + +h2_proxy_session *h2_proxy_session_setup(const char *id, proxy_conn_rec *p_conn, + proxy_server_conf *conf, + int h2_front, + unsigned char window_bits_connection, + unsigned char window_bits_stream, + h2_proxy_request_done *done); + +apr_status_t h2_proxy_session_submit(h2_proxy_session *s, const char *url, + request_rec *r, int standalone); + +/** + * Perform a step in processing the proxy session. Will return aftert + * one read/write cycle and indicate session status by status code. + * @param s the session to process + * @return APR_EAGAIN when processing needs to be invoked again + * APR_SUCCESS when all streams have been processed, session still live + * APR_EOF when the session has been terminated + */ +apr_status_t h2_proxy_session_process(h2_proxy_session *s); + +void h2_proxy_session_cancel_all(h2_proxy_session *s); + +void h2_proxy_session_cleanup(h2_proxy_session *s, h2_proxy_request_done *done); + +#define H2_PROXY_REQ_URL_NOTE "h2-proxy-req-url" + +#endif /* h2_proxy_session_h */ |