h2_stream.h

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/* 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 __mod_h2__h2_stream__
#define __mod_h2__h2_stream__

#include "h2.h"

struct h2_mplx;
struct h2_priority;
struct h2_request;
struct h2_headers;
struct h2_session;
struct h2_task;
struct h2_bucket_beam;

typedef struct h2_stream h2_stream;

typedef void h2_stream_state_cb(void *ctx, h2_stream *stream);
typedef void h2_stream_event_cb(void *ctx, h2_stream *stream, 
                                h2_stream_event_t ev);

typedef struct h2_stream_monitor {
    void *ctx;
    h2_stream_state_cb *on_state_enter;   /* called when a state is entered */
    h2_stream_state_cb *on_state_invalid; /* called when an invalid state change
                                             was detected */
    h2_stream_event_cb *on_state_event;   /* called right before the given event
                                             result in a new stream state */
    h2_stream_event_cb *on_event;         /* called for events that do not 
                                             trigger a state change */
} h2_stream_monitor;

struct h2_stream {
    int id;                     /* http2 stream identifier */
    int initiated_on;           /* initiating stream id (PUSH) or 0 */
    apr_pool_t *pool;           /* the memory pool for this stream */
    struct h2_session *session; /* the session this stream belongs to */
    h2_stream_state_t state;    /* state of this stream */
    
    apr_time_t created;         /* when stream was created */
    
    const struct h2_request *request; /* the request made in this stream */
    struct h2_request *rtmp;    /* request being assembled */
    apr_table_t *trailers;      /* optional incoming trailers */
    int request_headers_added;  /* number of request headers added */
    
    struct h2_bucket_beam *input;
    apr_bucket_brigade *in_buffer;
    int in_window_size;
    apr_time_t in_last_write;
    
    struct h2_bucket_beam *output;
    apr_bucket_brigade *out_buffer;
    apr_size_t max_mem;         /* maximum amount of data buffered */

    int rst_error;              /* stream error for RST_STREAM */
    unsigned int aborted   : 1; /* was aborted */
    unsigned int scheduled : 1; /* stream has been scheduled */
    unsigned int has_response : 1; /* response headers are known */
    unsigned int input_eof : 1; /* no more request data coming */
    unsigned int out_checked : 1; /* output eof was double checked */
    unsigned int push_policy;   /* which push policy to use for this request */
    
    struct h2_task *task;       /* assigned task to fullfill request */
    
    const h2_priority *pref_priority; /* preferred priority for this stream */
    apr_off_t out_frames;       /* # of frames sent out */
    apr_off_t out_frame_octets; /* # of RAW frame octets sent out */
    apr_off_t out_data_frames;  /* # of DATA frames sent */
    apr_off_t out_data_octets;  /* # of DATA octets (payload) sent */
    apr_off_t in_data_frames;   /* # of DATA frames received */
    apr_off_t in_data_octets;   /* # of DATA octets (payload) received */
    apr_off_t in_trailer_octets; /* # of HEADER octets (payload) received in trailers */
    
    h2_stream_monitor *monitor; /* optional monitor for stream states */
};


#define H2_STREAM_RST(s, def)    (s->rst_error? s->rst_error : (def))

h2_stream *h2_stream_create(int id, apr_pool_t *pool, 
                            struct h2_session *session,
                            h2_stream_monitor *monitor,
                            int initiated_on);

void h2_stream_destroy(h2_stream *stream);

apr_status_t h2_stream_prep_processing(h2_stream *stream);

/*
 * Set a new monitor for this stream, replacing any existing one. Can
 * be called with NULL to have no monitor installed.
 */
void h2_stream_set_monitor(h2_stream *stream, h2_stream_monitor *monitor);

void h2_stream_dispatch(h2_stream *stream, h2_stream_event_t ev);

void h2_stream_cleanup(h2_stream *stream);

apr_status_t h2_stream_in_consumed(h2_stream *stream, apr_off_t amount);

void h2_stream_set_request(h2_stream *stream, const h2_request *r);

apr_status_t h2_stream_set_request_rec(h2_stream *stream, 
                                       request_rec *r, int eos);

/*
 * Add a HTTP/2 header (including pseudo headers) or trailer 
 * to the given stream, depending on stream state.
 *
 * @param stream stream to write the header to
 * @param name the name of the HTTP/2 header
 * @param nlen the number of characters in name
 * @param value the header value
 * @param vlen the number of characters in value
 */
apr_status_t h2_stream_add_header(h2_stream *stream,
                                  const char *name, size_t nlen,
                                  const char *value, size_t vlen);
                                  
/* End the construction of request headers */
apr_status_t h2_stream_end_headers(h2_stream *stream, int eos, size_t raw_bytes);


apr_status_t h2_stream_send_frame(h2_stream *stream, int frame_type, int flags, size_t frame_len);
apr_status_t h2_stream_recv_frame(h2_stream *stream, int frame_type, int flags, size_t frame_len);

/*
 * Process a frame of received DATA.
 *
 * @param stream stream to write the data to
 * @param flags the frame flags
 * @param data the beginning of the bytes to write
 * @param len the number of bytes to write
 */
apr_status_t h2_stream_recv_DATA(h2_stream *stream, uint8_t flags,
                                 const uint8_t *data, size_t len);

apr_status_t h2_stream_flush_input(h2_stream *stream);

void h2_stream_rst(h2_stream *stream, int error_code);

int h2_stream_was_closed(const h2_stream *stream);

apr_status_t h2_stream_out_prepare(h2_stream *stream, apr_off_t *plen, 
                                   int *peos, h2_headers **presponse);

apr_status_t h2_stream_read_to(h2_stream *stream, apr_bucket_brigade *bb, 
                               apr_off_t *plen, int *peos);

apr_table_t *h2_stream_get_trailers(h2_stream *stream);

apr_status_t h2_stream_submit_pushes(h2_stream *stream, h2_headers *response);

const struct h2_priority *h2_stream_get_priority(h2_stream *stream, 
                                                 h2_headers *response);

const char *h2_stream_state_str(h2_stream *stream);

int h2_stream_is_ready(h2_stream *stream);

#define H2_STRM_MSG(s, msg)     \
    "h2_stream(%ld-%d,%s): "msg, s->session->id, s->id, h2_stream_state_str(s)

#define H2_STRM_LOG(aplogno, s, msg)    aplogno H2_STRM_MSG(s, msg)

#endif /* defined(__mod_h2__h2_stream__) */