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/* 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 independant 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_response;
struct h2_session;
struct h2_stream;
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_STREAM_READY, /* stream signalled availability of headers/data */
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 */
h2_session_state state; /* state session is in */
unsigned int reprioritize : 1; /* scheduled streams priority changed */
unsigned int eoc_written : 1; /* h2 eoc bucket written */
unsigned int flush : 1; /* flushing output necessary */
apr_interval_time_t wait_us; /* timout during BUSY_WAIT state, micro secs */
int unsent_submits; /* number of submitted, but not yet written responses. */
int unsent_promises; /* number of submitted, but not yet written push promised */
int requests_received; /* number of http/2 requests received */
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 */
int max_stream_received; /* highest stream id created */
int max_stream_handled; /* highest stream id completed */
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 start_wait; /* Time we started waiting for sth. to happen */
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_pool_t *pool; /* pool to use in session handling */
apr_bucket_brigade *bbtmp; /* brigade for keeping temporary data */
struct apr_thread_cond_t *iowait; /* our cond when trywaiting for data */
struct h2_filter_cin *cin; /* connection input filter context */
h2_conn_io io; /* io on httpd conn filters */
struct h2_mplx *mplx; /* multiplexer for stream data */
struct h2_stream *last_stream; /* last stream worked with */
struct h2_ihash_t *streams; /* streams handled by this session */
apr_pool_t *spare; /* spare stream pool */
struct nghttp2_session *ngh2; /* the nghttp2 session (internal use) */
struct h2_workers *workers; /* for executing stream tasks */
struct h2_push_diary *push_diary; /* remember pushes, avoid duplicates */
char status[64]; /* status message for scoreboard */
} h2_session;
/**
* Create a new h2_session for the given connection.
* The session will apply the configured parameter.
* @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
*/
h2_session *h2_session_create(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 r the request that was upgraded
* @param cfg the module config to apply
* @param workers the worker pool to use
* @return the created session
*/
h2_session *h2_session_rcreate(request_rec *r, struct h2_ctx *ctx,
struct h2_workers *workers);
/**
* Process the given HTTP/2 session until it is ended or a fatal
* error occured.
*
* @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);
/**
* Cleanup the session and all objects it still contains. This will not
* destroy h2_task instances that have not finished yet.
* @param session the session to destroy
*/
void h2_session_eoc_callback(h2_session *session);
/**
* Called when a serious error occured 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);
/* Start submitting the response to a stream request. This is possible
* once we have all the response headers. */
apr_status_t h2_session_handle_response(h2_session *session,
struct h2_stream *stream);
/* Get the h2_stream for the given stream idenrtifier. */
struct h2_stream *h2_session_get_stream(h2_session *session, int stream_id);
/**
* Create and register a new stream under the given id.
*
* @param session the session to register in
* @param stream_id the new stream identifier
* @return the new stream
*/
struct h2_stream *h2_session_open_stream(h2_session *session, int stream_id);
/**
* Returns if client settings have push enabled.
* @param != 0 iff push is enabled in client settings
*/
int h2_session_push_enabled(h2_session *session);
/**
* Destroy the stream and release it everywhere. Reclaim all resources.
* @param session the session to which the stream belongs
* @param stream the stream to destroy
*/
apr_status_t h2_session_stream_destroy(h2_session *session,
struct h2_stream *stream);
/**
* 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);
#endif /* defined(__mod_h2__h2_session__) */
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