nghttp2/lib/nghttp2_outbound_item.h

/*
 * nghttp2 - HTTP/2 C Library
 *
 * Copyright (c) 2012 Tatsuhiro Tsujikawa
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#ifndef NGHTTP2_OUTBOUND_ITEM_H
#define NGHTTP2_OUTBOUND_ITEM_H

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /* HAVE_CONFIG_H */

#include <nghttp2/nghttp2.h>
#include "nghttp2_frame.h"

/* A bit higher weight for non-DATA frames */
#define NGHTTP2_OB_EX_WEIGHT 300
/* Higher weight for SETTINGS */
#define NGHTTP2_OB_SETTINGS_WEIGHT 301
/* Highest weight for PING */
#define NGHTTP2_OB_PING_WEIGHT 302

/* struct used for HEADERS and PUSH_PROMISE frame */
typedef struct {
  nghttp2_data_provider data_prd;
  void *stream_user_data;
  /* nonzero if this item should be attached to stream object to make
     it under priority control */
  uint8_t attach_stream;
} nghttp2_headers_aux_data;

/* struct used for DATA frame */
typedef struct {
  /**
   * The data to be sent for this DATA frame.
   */
  nghttp2_data_provider data_prd;
  /**
   * The flags of DATA frame.  We use separate flags here and
   * nghttp2_data frame.  The latter contains flags actually sent to
   * peer.  This |flags| may contain NGHTTP2_FLAG_END_STREAM and only
   * when |eof| becomes nonzero, flags in nghttp2_data has
   * NGHTTP2_FLAG_END_STREAM set.
   */
  uint8_t flags;
  /**
   * The flag to indicate whether EOF was reached or not. Initially
   * |eof| is 0. It becomes 1 after all data were read.
   */
  uint8_t eof;
} nghttp2_data_aux_data;

/* struct used for GOAWAY frame */
typedef struct {
  /* nonzero if session should be terminated after the transmission of
     this frame. */
  int terminate_on_send;
} nghttp2_goaway_aux_data;

/* Additional data which cannot be stored in nghttp2_frame struct */
typedef union {
  nghttp2_data_aux_data data;
  nghttp2_headers_aux_data headers;
  nghttp2_goaway_aux_data goaway;
} nghttp2_aux_data;

typedef struct {
  nghttp2_frame frame;
  nghttp2_aux_data aux_data;
  int64_t seq;
  /* Reset count of weight. See comment for last_cycle in
     nghttp2_session.h */
  uint64_t cycle;
  /* The priority used in priority comparion.  Larger is served
     ealier. */
  int32_t weight;
  /* nonzero if this object is queued. */
  uint8_t queued;
} nghttp2_outbound_item;

/*
 * Deallocates resource for |item|. If |item| is NULL, this function
 * does nothing.
 */
void nghttp2_outbound_item_free(nghttp2_outbound_item *item);

#endif /* NGHTTP2_OUTBOUND_ITEM_H */