nghttp2/lib/nghttp2_stream.h

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/*
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* nghttp2 - HTTP/2.0 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.
*/
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#ifndef NGHTTP2_STREAM_H
#define NGHTTP2_STREAM_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
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#include <nghttp2/nghttp2.h>
#include "nghttp2_outbound_item.h"
#include "nghttp2_map.h"
/*
* If local peer is stream initiator:
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* NGHTTP2_STREAM_OPENING : upon sending request HEADERS
* NGHTTP2_STREAM_OPENED : upon receiving response HEADERS
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* NGHTTP2_STREAM_CLOSING : upon queuing RST_STREAM
*
* If remote peer is stream initiator:
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* NGHTTP2_STREAM_OPENING : upon receiving request HEADERS
* NGHTTP2_STREAM_OPENED : upon sending response HEADERS
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* NGHTTP2_STREAM_CLOSING : upon queuing RST_STREAM
*/
typedef enum {
/* Initial state */
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NGHTTP2_STREAM_INITIAL,
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/* For stream initiator: request HEADERS has been sent, but response
HEADERS has not been received yet. For receiver: request HEADERS
has been received, but it does not send response HEADERS yet. */
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NGHTTP2_STREAM_OPENING,
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/* For stream initiator: response HEADERS is received. For receiver:
response HEADERS is sent. */
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NGHTTP2_STREAM_OPENED,
/* RST_STREAM is received, but somehow we need to keep stream in
memory. */
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NGHTTP2_STREAM_CLOSING,
/* PUSH_PROMISE is received or sent */
NGHTTP2_STREAM_RESERVED
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} nghttp2_stream_state;
typedef enum {
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NGHTTP2_SHUT_NONE = 0,
/* Indicates further receptions will be disallowed. */
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NGHTTP2_SHUT_RD = 0x01,
/* Indicates further transmissions will be disallowed. */
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NGHTTP2_SHUT_WR = 0x02,
/* Indicates both further receptions and transmissions will be
disallowed. */
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NGHTTP2_SHUT_RDWR = NGHTTP2_SHUT_RD | NGHTTP2_SHUT_WR
} nghttp2_shut_flag;
typedef enum {
NGHTTP2_STREAM_FLAG_NONE = 0,
/* Indicates that this stream is pushed stream */
NGHTTP2_STREAM_FLAG_PUSH = 0x01
} nghttp2_stream_flag;
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typedef enum {
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NGHTTP2_DEFERRED_NONE = 0,
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/* Indicates the DATA is deferred due to flow control. */
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NGHTTP2_DEFERRED_FLOW_CONTROL = 0x01
} nghttp2_deferred_flag;
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typedef struct {
/* Intrusive Map */
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nghttp2_map_entry map_entry;
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/* The arbitrary data provided by user for this stream. */
void *stream_user_data;
/* Deferred DATA frame */
nghttp2_outbound_item *deferred_data;
/* stream ID */
int32_t stream_id;
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/* Use same value in request HEADERS frame */
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int32_t pri;
/* Current remote window size. This value is computed against the
current initial window size of remote endpoint. */
int32_t remote_window_size;
/* Keep track of the number of bytes received without
WINDOW_UPDATE. This could be negative after submitting negative
value to WINDOW_UPDATE */
int32_t recv_window_size;
/* The amount of recv_window_size cut using submitting negative
value to WINDOW_UPDATE */
int32_t recv_reduction;
/* window size for local flow control. It is initially set to
NGHTTP2_INITIAL_WINDOW_SIZE and could be increased/decreased by
submitting WINDOW_UPDATE. See nghttp2_submit_window_update(). */
int32_t local_window_size;
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nghttp2_stream_state state;
/* This is bitwise-OR of 0 or more of nghttp2_stream_flag. */
uint8_t flags;
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/* Bitwise OR of zero or more nghttp2_shut_flag values */
uint8_t shut_flags;
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/* The flags for defered DATA. Bitwise OR of zero or more
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nghttp2_deferred_flag values */
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uint8_t deferred_flags;
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} nghttp2_stream;
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void nghttp2_stream_init(nghttp2_stream *stream, int32_t stream_id,
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uint8_t flags, int32_t pri,
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nghttp2_stream_state initial_state,
int32_t remote_initial_window_size,
int32_t local_initial_window_size,
void *stream_user_data);
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void nghttp2_stream_free(nghttp2_stream *stream);
/*
* Disallow either further receptions or transmissions, or both.
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* |flag| is bitwise OR of one or more of nghttp2_shut_flag.
*/
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void nghttp2_stream_shutdown(nghttp2_stream *stream, nghttp2_shut_flag flag);
/*
* Defer DATA frame |data|. We won't call this function in the
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* situation where stream->deferred_data != NULL. If |flags| is
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* bitwise OR of zero or more nghttp2_deferred_flag values.
*/
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void nghttp2_stream_defer_data(nghttp2_stream *stream,
nghttp2_outbound_item *data,
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uint8_t flags);
/*
* Detaches deferred data from this stream. This function does not
* free deferred data.
*/
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void nghttp2_stream_detach_deferred_data(nghttp2_stream *stream);
/*
* Updates the remote window size with the new value
* |new_initial_window_size|. The |old_initial_window_size| is used to
* calculate the current window size.
*
* This function returns 0 if it succeeds or -1. The failure is due to
* overflow.
*/
int nghttp2_stream_update_remote_initial_window_size
(nghttp2_stream *stream,
int32_t new_initial_window_size,
int32_t old_initial_window_size);
/*
* Updates the local window size with the new value
* |new_initial_window_size|. The |old_initial_window_size| is used to
* calculate the current window size.
*
* This function returns 0 if it succeeds or -1. The failure is due to
* overflow.
*/
int nghttp2_stream_update_local_initial_window_size
(nghttp2_stream *stream,
int32_t new_initial_window_size,
int32_t old_initial_window_size);
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/*
* Call this function if promised stream |stream| is replied with
* HEADERS. This function makes the state of the |stream| to
* NGHTTP2_STREAM_OPENED.
*/
void nghttp2_stream_promise_fulfilled(nghttp2_stream *stream);
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#endif /* NGHTTP2_STREAM */