/* Copyright 2015 greenbytes GmbH (https://www.greenbytes.de) * * Licensed 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 __mod_h2__h2_session__ #define __mod_h2__h2_session__ #include "h2_conn_io.h" /** * A HTTP/2 connection, a session with a specific client. * * h2_session sits on top of a httpd conn_rec* instance and takes complete * control of the connection data. It receives protocol frames from the * client. For new HTTP/2 streams it creates h2_task(s) that are sent * via callback to a dispatcher (see h2_conn.c). * h2_session keeps h2_io's for each ongoing stream which buffer the * payload for that stream. * * New incoming HEADER frames are converted into a h2_stream+h2_task instance * that both represent a HTTP/2 stream, but may have separate lifetimes. This * allows h2_task to be scheduled in other threads without semaphores * all over the place. It allows task memory to be freed independent of * session lifetime and sessions may close down while tasks are still running. * * */ #include "h2.h" struct apr_thread_mutext_t; struct apr_thread_cond_t; struct h2_ctx; struct h2_config; struct h2_filter_cin; struct h2_ihash_t; struct h2_mplx; struct h2_priority; struct h2_push; struct h2_push_diary; struct h2_session; struct h2_stream; struct h2_stream_monitor; struct h2_task; struct h2_workers; struct nghttp2_session; typedef enum { H2_SESSION_EV_INIT, /* session was initialized */ H2_SESSION_EV_LOCAL_GOAWAY, /* we send a GOAWAY */ H2_SESSION_EV_REMOTE_GOAWAY, /* remote send us a GOAWAY */ H2_SESSION_EV_CONN_ERROR, /* connection error */ H2_SESSION_EV_PROTO_ERROR, /* protocol error */ H2_SESSION_EV_CONN_TIMEOUT, /* connection timeout */ H2_SESSION_EV_NO_IO, /* nothing has been read or written */ H2_SESSION_EV_DATA_READ, /* connection data has been read */ H2_SESSION_EV_NGH2_DONE, /* nghttp2 wants neither read nor write anything */ H2_SESSION_EV_MPM_STOPPING, /* the process is stopping */ H2_SESSION_EV_PRE_CLOSE, /* connection will close after this */ } h2_session_event_t; typedef struct h2_session { long id; /* identifier of this session, unique * inside a httpd process */ conn_rec *c; /* the connection this session serves */ request_rec *r; /* the request that started this in case * of 'h2c', NULL otherwise */ server_rec *s; /* server/vhost we're starting on */ const struct h2_config *config; /* Relevant config for this session */ apr_pool_t *pool; /* pool to use in session */ struct h2_mplx *mplx; /* multiplexer for stream data */ struct h2_workers *workers; /* for executing stream tasks */ struct h2_filter_cin *cin; /* connection input filter context */ h2_conn_io io; /* io on httpd conn filters */ struct nghttp2_session *ngh2; /* the nghttp2 session (internal use) */ h2_session_state state; /* state session is in */ h2_session_props local; /* properties of local session */ h2_session_props remote; /* properites of remote session */ unsigned int reprioritize : 1; /* scheduled streams priority changed */ unsigned int flush : 1; /* flushing output necessary */ unsigned int have_read : 1; /* session has read client data */ unsigned int have_written : 1; /* session did write data to client */ apr_interval_time_t wait_us; /* timeout during BUSY_WAIT state, micro secs */ struct h2_push_diary *push_diary; /* remember pushes, avoid duplicates */ struct h2_stream_monitor *monitor;/* monitor callbacks for streams */ int open_streams; /* number of client streams open */ int unsent_submits; /* number of submitted, but not yet written responses. */ int unsent_promises; /* number of submitted, but not yet written push promises */ int responses_submitted; /* number of http/2 responses submitted */ int streams_reset; /* number of http/2 streams reset by client */ int pushes_promised; /* number of http/2 push promises submitted */ int pushes_submitted; /* number of http/2 pushed responses submitted */ int pushes_reset; /* number of http/2 pushed reset by client */ apr_size_t frames_received; /* number of http/2 frames received */ apr_size_t frames_sent; /* number of http/2 frames sent */ apr_size_t max_stream_count; /* max number of open streams */ apr_size_t max_stream_mem; /* max buffer memory for a single stream */ apr_time_t idle_until; /* Time we shut down due to sheer boredom */ apr_time_t keep_sync_until; /* Time we sync wait until passing to async mpm */ apr_bucket_brigade *bbtmp; /* brigade for keeping temporary data */ struct apr_thread_cond_t *iowait; /* our cond when trywaiting for data */ char status[64]; /* status message for scoreboard */ int last_status_code; /* the one already reported */ const char *last_status_msg; /* the one already reported */ struct h2_iqueue *in_pending; /* all streams with input pending */ struct h2_iqueue *in_process; /* all streams ready for processing on slave */ } h2_session; const char *h2_session_state_str(h2_session_state state); /** * Create a new h2_session for the given connection. * The session will apply the configured parameter. * @param psession pointer receiving the created session on success or NULL * @param c the connection to work on * @param cfg the module config to apply * @param workers the worker pool to use * @return the created session */ apr_status_t h2_session_create(h2_session **psession, conn_rec *c, struct h2_ctx *ctx, struct h2_workers *workers); /** * Create a new h2_session for the given request. * The session will apply the configured parameter. * @param psession pointer receiving the created session on success or NULL * @param r the request that was upgraded * @param cfg the module config to apply * @param workers the worker pool to use * @return the created session */ apr_status_t h2_session_rcreate(h2_session **psession, request_rec *r, struct h2_ctx *ctx, struct h2_workers *workers); void h2_session_event(h2_session *session, h2_session_event_t ev, int err, const char *msg); /** * Process the given HTTP/2 session until it is ended or a fatal * error occurred. * * @param session the sessionm to process */ apr_status_t h2_session_process(h2_session *session, int async); /** * Last chance to do anything before the connection is closed. */ apr_status_t h2_session_pre_close(h2_session *session, int async); /** * Called when a serious error occurred and the session needs to terminate * without further connection io. * @param session the session to abort * @param reason the apache status that caused the abort */ void h2_session_abort(h2_session *session, apr_status_t reason); /** * Close and deallocate the given session. */ void h2_session_close(h2_session *session); /** * Returns if client settings have push enabled. * @param != 0 iff push is enabled in client settings */ int h2_session_push_enabled(h2_session *session); /** * Look up the stream in this session with the given id. */ struct h2_stream *h2_session_stream_get(h2_session *session, int stream_id); /** * Submit a push promise on the stream and schedule the new steam for * processing.. * * @param session the session to work in * @param is the stream initiating the push * @param push the push to promise * @return the new promised stream or NULL */ struct h2_stream *h2_session_push(h2_session *session, struct h2_stream *is, struct h2_push *push); apr_status_t h2_session_set_prio(h2_session *session, struct h2_stream *stream, const struct h2_priority *prio); #define H2_SSSN_MSG(s, msg) \ "h2_session(%ld,%s,%d): "msg, s->id, h2_session_state_str(s->state), \ s->open_streams #define H2_SSSN_LOG(aplogno, s, msg) aplogno H2_SSSN_MSG(s, msg) #endif /* defined(__mod_h2__h2_session__) */