444 lines
15 KiB
C
444 lines
15 KiB
C
/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2012 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef NGHTTP2_STREAM_H
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#define NGHTTP2_STREAM_H
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <nghttp2/nghttp2.h>
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#include "nghttp2_outbound_item.h"
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#include "nghttp2_map.h"
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#include "nghttp2_pq.h"
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#include "nghttp2_int.h"
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/*
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* Maximum number of streams in one dependency tree.
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*/
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#define NGHTTP2_MAX_DEP_TREE_LENGTH 100
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/*
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* If local peer is stream initiator:
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* NGHTTP2_STREAM_OPENING : upon sending request HEADERS
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* NGHTTP2_STREAM_OPENED : upon receiving response HEADERS
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* NGHTTP2_STREAM_CLOSING : upon queuing RST_STREAM
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*
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* If remote peer is stream initiator:
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* NGHTTP2_STREAM_OPENING : upon receiving request HEADERS
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* NGHTTP2_STREAM_OPENED : upon sending response HEADERS
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* NGHTTP2_STREAM_CLOSING : upon queuing RST_STREAM
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*/
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typedef enum {
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/* Initial state */
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NGHTTP2_STREAM_INITIAL,
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/* For stream initiator: request HEADERS has been sent, but response
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HEADERS has not been received yet. For receiver: request HEADERS
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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:
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response HEADERS is sent. */
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NGHTTP2_STREAM_OPENED,
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/* RST_STREAM is received, but somehow we need to keep stream in
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memory. */
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NGHTTP2_STREAM_CLOSING,
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/* PUSH_PROMISE is received or sent */
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NGHTTP2_STREAM_RESERVED,
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/* Stream is created in this state if it is used as anchor in
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dependency tree. */
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NGHTTP2_STREAM_IDLE
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} nghttp2_stream_state;
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typedef enum {
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NGHTTP2_SHUT_NONE = 0,
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/* Indicates further receptions will be disallowed. */
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NGHTTP2_SHUT_RD = 0x01,
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/* Indicates further transmissions will be disallowed. */
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NGHTTP2_SHUT_WR = 0x02,
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/* Indicates both further receptions and transmissions will be
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disallowed. */
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NGHTTP2_SHUT_RDWR = NGHTTP2_SHUT_RD | NGHTTP2_SHUT_WR
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} nghttp2_shut_flag;
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typedef enum {
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NGHTTP2_STREAM_FLAG_NONE = 0,
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/* Indicates that this stream is pushed stream */
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NGHTTP2_STREAM_FLAG_PUSH = 0x01,
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/* Indicates that this stream was closed */
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NGHTTP2_STREAM_FLAG_CLOSED = 0x02,
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/* Indicates the item is deferred due to flow control. */
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NGHTTP2_STREAM_FLAG_DEFERRED_FLOW_CONTROL = 0x04,
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/* Indicates the item is deferred by user callback */
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NGHTTP2_STREAM_FLAG_DEFERRED_USER = 0x08,
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/* bitwise OR of NGHTTP2_STREAM_FLAG_DEFERRED_FLOW_CONTROL and
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NGHTTP2_STREAM_FLAG_DEFERRED_USER. */
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NGHTTP2_STREAM_FLAG_DEFERRED_ALL = 0x0c
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} nghttp2_stream_flag;
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typedef enum {
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NGHTTP2_STREAM_DPRI_NONE = 0,
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NGHTTP2_STREAM_DPRI_NO_DATA = 0x01,
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NGHTTP2_STREAM_DPRI_TOP = 0x02,
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NGHTTP2_STREAM_DPRI_REST = 0x04
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} nghttp2_stream_dpri;
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struct nghttp2_stream_roots;
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typedef struct nghttp2_stream_roots nghttp2_stream_roots;
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struct nghttp2_stream;
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typedef struct nghttp2_stream nghttp2_stream;
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struct nghttp2_stream {
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/* Intrusive Map */
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nghttp2_map_entry map_entry;
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/* pointers to form dependency tree. If multiple streams depend on
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a stream, only one stream (left most) has non-NULL dep_prev which
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points to the stream it depends on. The remaining streams are
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linked using sib_prev and sib_next. The stream which has
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non-NULL dep_prev always NULL sib_prev. The right most stream
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has NULL sib_next. If this stream is a root of dependency tree,
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dep_prev and sib_prev are NULL. */
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nghttp2_stream *dep_prev, *dep_next;
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nghttp2_stream *sib_prev, *sib_next;
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/* pointers to track dependency tree root streams. This is
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doubly-linked list and first element is pointed by
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roots->head. */
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nghttp2_stream *root_prev, *root_next;
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/* When stream is kept after closure, it may be kept in doubly
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linked list pointed by nghttp2_session closed_stream_head.
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closed_next points to the next stream object if it is the element
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of the list. */
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nghttp2_stream *closed_prev, *closed_next;
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/* pointer to roots, which tracks dependency tree roots */
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nghttp2_stream_roots *roots;
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/* The arbitrary data provided by user for this stream. */
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void *stream_user_data;
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/* Item to send */
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nghttp2_outbound_item *data_item;
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/* stream ID */
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int32_t stream_id;
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/* categorized priority of this stream. Only stream bearing
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NGHTTP2_STREAM_DPRI_TOP can send item. */
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nghttp2_stream_dpri dpri;
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/* the number of streams in subtree */
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size_t num_substreams;
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/* Current remote window size. This value is computed against the
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current initial window size of remote endpoint. */
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int32_t remote_window_size;
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/* Keep track of the number of bytes received without
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WINDOW_UPDATE. This could be negative after submitting negative
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value to WINDOW_UPDATE */
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int32_t recv_window_size;
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/* The number of bytes consumed by the application and now is
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subject to WINDOW_UPDATE. This is only used when auto
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WINDOW_UPDATE is turned off. */
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int32_t consumed_size;
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/* The amount of recv_window_size cut using submitting negative
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value to WINDOW_UPDATE */
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int32_t recv_reduction;
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/* window size for local flow control. It is initially set to
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NGHTTP2_INITIAL_WINDOW_SIZE and could be increased/decreased by
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submitting WINDOW_UPDATE. See nghttp2_submit_window_update(). */
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int32_t local_window_size;
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/* weight of this stream */
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int32_t weight;
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/* effective weight of this stream in belonging dependency tree */
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int32_t effective_weight;
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/* sum of weight (not effective_weight) of direct descendants */
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int32_t sum_dep_weight;
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/* sum of weight of direct descendants which have at least one
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descendant with dpri == NGHTTP2_STREAM_DPRI_TOP. We use this
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value to calculate effective weight. */
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int32_t sum_norest_weight;
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/* sum of weight of direct descendants whose dpri value is
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NGHTTP2_STREAM_DPRI_TOP */
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int32_t sum_top_weight;
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nghttp2_stream_state state;
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/* This is bitwise-OR of 0 or more of nghttp2_stream_flag. */
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uint8_t flags;
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/* Bitwise OR of zero or more nghttp2_shut_flag values */
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uint8_t shut_flags;
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};
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void nghttp2_stream_init(nghttp2_stream *stream, int32_t stream_id,
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uint8_t flags, nghttp2_stream_state initial_state,
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int32_t weight, nghttp2_stream_roots *roots,
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int32_t remote_initial_window_size,
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int32_t local_initial_window_size,
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void *stream_user_data);
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void nghttp2_stream_free(nghttp2_stream *stream);
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/*
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* 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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*/
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void nghttp2_stream_shutdown(nghttp2_stream *stream, nghttp2_shut_flag flag);
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/*
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* Defer |stream->data_item|. We won't call this function in the
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* situation where |stream->data_item| == NULL. If |flags| is bitwise
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* OR of zero or more of NGHTTP2_STREAM_FLAG_DEFERRED_USER and
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* NGHTTP2_STREAM_FLAG_DEFERRED_FLOW_CONTROL. The |flags| indicates
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* the reason of this action.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory
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*/
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int nghttp2_stream_defer_data(nghttp2_stream *stream, uint8_t flags,
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nghttp2_session *session);
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/*
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* Put back deferred data in this stream to active state. The |flags|
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* are one or more of bitwise OR of the following values:
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* NGHTTP2_STREAM_FLAG_DEFERRED_USER and
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* NGHTTP2_STREAM_FLAG_DEFERRED_FLOW_CONTROL and given masks are
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* cleared if they are set. So even if this function is called, if
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* one of flag is still set, data does not become active.
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*/
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int nghttp2_stream_resume_deferred_data(nghttp2_stream *stream, uint8_t flags,
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nghttp2_session *session);
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/*
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* Returns nonzero if data item is deferred by whatever reason.
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*/
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int nghttp2_stream_check_deferred_data(nghttp2_stream *stream);
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/*
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* Returns nonzero if data item is deferred by flow control.
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*/
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int nghttp2_stream_check_deferred_by_flow_control(nghttp2_stream *stream);
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/*
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* Updates the remote window size with the new value
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* |new_initial_window_size|. The |old_initial_window_size| is used to
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* calculate the current window size.
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*
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* This function returns 0 if it succeeds or -1. The failure is due to
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* overflow.
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*/
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int nghttp2_stream_update_remote_initial_window_size(
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nghttp2_stream *stream, int32_t new_initial_window_size,
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int32_t old_initial_window_size);
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/*
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* Updates the local window size with the new value
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* |new_initial_window_size|. The |old_initial_window_size| is used to
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* calculate the current window size.
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*
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* This function returns 0 if it succeeds or -1. The failure is due to
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* overflow.
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*/
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int nghttp2_stream_update_local_initial_window_size(
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nghttp2_stream *stream, int32_t new_initial_window_size,
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int32_t old_initial_window_size);
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/*
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* Call this function if promised stream |stream| is replied with
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* HEADERS. This function makes the state of the |stream| to
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* NGHTTP2_STREAM_OPENED.
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*/
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void nghttp2_stream_promise_fulfilled(nghttp2_stream *stream);
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/*
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* Returns the stream positioned in root of the dependency tree the
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* |stream| belongs to.
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*/
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nghttp2_stream *nghttp2_stream_get_dep_root(nghttp2_stream *stream);
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/*
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* Returns nonzero if |target| is found in subtree of |stream|.
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*/
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int nghttp2_stream_dep_subtree_find(nghttp2_stream *stream,
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nghttp2_stream *target);
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/*
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* Computes distributed weight of a stream of the |weight| under the
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* |stream| if |stream| is removed from a dependency tree. The result
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* is computed using stream->weight rather than
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* stream->effective_weight.
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*/
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int32_t nghttp2_stream_dep_distributed_weight(nghttp2_stream *stream,
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int32_t weight);
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/*
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* Computes effective weight of a stream of the |weight| under the
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* |stream|. The result is computed using stream->effective_weight
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* rather than stream->weight. This function is used to determine
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* weight in dependency tree.
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*/
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int32_t nghttp2_stream_dep_distributed_effective_weight(nghttp2_stream *stream,
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int32_t weight);
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/*
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* Makes the |stream| depend on the |dep_stream|. This dependency is
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* exclusive. All existing direct descendants of |dep_stream| become
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* the descendants of the |stream|. This function assumes
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* |stream->data| is NULL and no dpri members are changed in this
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* dependency tree.
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*/
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void nghttp2_stream_dep_insert(nghttp2_stream *dep_stream,
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nghttp2_stream *stream);
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/*
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* Makes the |stream| depend on the |dep_stream|. This dependency is
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* not exclusive. This function assumes |stream->data| is NULL and no
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* dpri members are changed in this dependency tree.
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*/
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void nghttp2_stream_dep_add(nghttp2_stream *dep_stream, nghttp2_stream *stream);
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/*
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* Removes the |stream| from the current dependency tree. This
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* function assumes |stream->data| is NULL.
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*/
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void nghttp2_stream_dep_remove(nghttp2_stream *stream);
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/*
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* Attaches |data_item| to |stream|. Updates dpri members in this
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* dependency tree.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory
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*/
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int nghttp2_stream_attach_data(nghttp2_stream *stream,
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nghttp2_outbound_item *data_item,
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nghttp2_session *session);
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/*
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* Detaches |stream->data_item|. Updates dpri members in this
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* dependency tree. This function does not free |stream->data_item|.
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* The caller must free it.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory
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*/
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int nghttp2_stream_detach_data(nghttp2_stream *stream,
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nghttp2_session *session);
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/*
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* Makes the |stream| depend on the |dep_stream|. This dependency is
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* exclusive. Updates dpri members in this dependency tree.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory
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*/
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int nghttp2_stream_dep_insert_subtree(nghttp2_stream *dep_stream,
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nghttp2_stream *stream,
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nghttp2_session *session);
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/*
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* Makes the |stream| depend on the |dep_stream|. This dependency is
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* not exclusive. Updates dpri members in this dependency tree.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory
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*/
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int nghttp2_stream_dep_add_subtree(nghttp2_stream *dep_stream,
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nghttp2_stream *stream,
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nghttp2_session *session);
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/*
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* Removes subtree whose root stream is |stream|. Removing subtree
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* does not change dpri values. The effective_weight of streams in
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* removed subtree is not updated.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory
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*/
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void nghttp2_stream_dep_remove_subtree(nghttp2_stream *stream);
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/*
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* Makes the |stream| as root. Updates dpri members in this
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* dependency tree.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory
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*/
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int nghttp2_stream_dep_make_root(nghttp2_stream *stream,
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nghttp2_session *session);
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/*
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* Makes the |stream| as root and all existing root streams become
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* direct children of |stream|.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory
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*/
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int
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nghttp2_stream_dep_all_your_stream_are_belong_to_us(nghttp2_stream *stream,
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nghttp2_session *session);
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/*
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* Returns nonzero if |stream| is in any dependency tree.
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*/
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int nghttp2_stream_in_dep_tree(nghttp2_stream *stream);
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struct nghttp2_stream_roots {
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nghttp2_stream *head;
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int32_t num_streams;
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};
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void nghttp2_stream_roots_init(nghttp2_stream_roots *roots);
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void nghttp2_stream_roots_free(nghttp2_stream_roots *roots);
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void nghttp2_stream_roots_add(nghttp2_stream_roots *roots,
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nghttp2_stream *stream);
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void nghttp2_stream_roots_remove(nghttp2_stream_roots *roots,
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nghttp2_stream *stream);
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void nghttp2_stream_roots_remove_all(nghttp2_stream_roots *roots);
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#endif /* NGHTTP2_STREAM */
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