nghttp2/lib/spdylay_stream.h

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/*
* Spdylay - SPDY 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 SPDYLAY_STREAM_H
#define SPDYLAY_STREAM_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <spdylay/spdylay.h>
#include "spdylay_outbound_item.h"
/*
* If local peer is stream initiator:
* SPDYLAY_STREAM_OPENING : upon sending SYN_STREAM
* SPDYLAY_STREAM_OPENED : upon receiving SYN_REPLY
* SPDYLAY_STREAM_CLOSING : upon queuing RST_STREAM
*
* If remote peer is stream initiator:
* SPDYLAY_STREAM_OPENING : upon receiving SYN_STREAM
* SPDYLAY_STREAM_OPENED : upon sending SYN_REPLY
* SPDYLAY_STREAM_CLOSING : upon queuing RST_STREAM
*/
typedef enum {
/* Initial state */
SPDYLAY_STREAM_INITIAL,
/* For stream initiator: SYN_STREAM has been sent, but SYN_REPLY is
not received yet. For receiver: SYN_STREAM has been received,
but it does not send SYN_REPLY yet. */
SPDYLAY_STREAM_OPENING,
/* For stream initiator: SYN_REPLY is received. For receiver:
SYN_REPLY is sent. */
SPDYLAY_STREAM_OPENED,
/* RST_STREAM is received, but somehow we need to keep stream in
memory. */
SPDYLAY_STREAM_CLOSING
} spdylay_stream_state;
typedef enum {
SPDYLAY_SHUT_NONE = 0,
/* Indicates further receptions will be disallowed. */
SPDYLAY_SHUT_RD = 0x01,
/* Indicates further transmissions will be disallowed. */
SPDYLAY_SHUT_WR = 0x02,
/* Indicates both further receptions and transmissions will be
disallowed. */
SPDYLAY_SHUT_RDWR = SPDYLAY_SHUT_RD | SPDYLAY_SHUT_WR
} spdylay_shut_flag;
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typedef enum {
SPDYLAY_DEFERRED_NONE = 0,
/* Indicates the DATA is deferred due to flow control. */
SPDYLAY_DEFERRED_FLOW_CONTROL = 0x01
} spdylay_deferred_flag;
typedef struct {
int32_t stream_id;
spdylay_stream_state state;
/* Use same value in SYN_STREAM frame */
uint8_t flags;
/* Use same scheme in SYN_STREAM frame */
uint8_t pri;
/* Bitwise OR of zero or more spdylay_shut_flag values */
uint8_t shut_flags;
/* The array of server-pushed stream IDs which associate them to
this stream. */
int32_t *pushed_streams;
/* The number of stored pushed stream ID in |pushed_streams| */
size_t pushed_streams_length;
/* The maximum number of stream ID the |pushed_streams| can
store. */
size_t pushed_streams_capacity;
/* The arbitrary data provided by user for this stream. */
void *stream_user_data;
/* Deferred DATA frame */
spdylay_outbound_item *deferred_data;
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/* The flags for defered DATA. Bitwise OR of zero or more
spdylay_deferred_flag values */
uint8_t deferred_flags;
/* Initial window size where window_size is compuated
against. Initially, window_size = initial_window_size. When N
bytes are sent, window_size -= N. After that, when the initial
window size is changed, say, new_initial_window_size, then
window_size becomes
new_initial_window_size-(initial_window_size-window_size) */
int32_t initial_window_size;
/* Current sender window size */
int32_t window_size;
/* Keep track of the number of bytes received without
WINDOW_UPDATE. */
int32_t recv_window_size;
} spdylay_stream;
void spdylay_stream_init(spdylay_stream *stream, int32_t stream_id,
uint8_t flags, uint8_t pri,
spdylay_stream_state initial_state,
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int32_t initial_window_size,
void *stream_user_data);
void spdylay_stream_free(spdylay_stream *stream);
/*
* Disallow either further receptions or transmissions, or both.
* |flag| is bitwise OR of one or more of spdylay_shut_flag.
*/
void spdylay_stream_shutdown(spdylay_stream *stream, spdylay_shut_flag flag);
/*
* Add server-pushed |stream_id| to this stream. This happens when
* server-pushed stream is associated to this stream. This function
* returns 0 if it succeeds, or negative error code.
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*
* RETURN VALUE
* ------------
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
int spdylay_stream_add_pushed_stream(spdylay_stream *stream, int32_t stream_id);
/*
* 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
* bitwise OR of zero or more spdylay_deferred_flag values.
*/
void spdylay_stream_defer_data(spdylay_stream *stream,
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spdylay_outbound_item *data,
uint8_t flags);
/*
* Detaches deferred data from this stream. This function does not
* free deferred data.
*/
void spdylay_stream_detach_deferred_data(spdylay_stream *stream);
#endif /* SPDYLAY_STREAM */