/*
* 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.
*/
#include "nghttp2_stream.h"
#include <assert.h>
#include <stdio.h>
#include "nghttp2_session.h"
#include "nghttp2_helper.h"
#include "nghttp2_debug.h"
/* Maximum distance between any two stream's cycle in the same
prirority queue. Imagine stream A's cycle is A, and stream B's
cycle is B, and A < B. The cycle is unsigned 32 bit integer, it
may get overflow. Because of how we calculate the next cycle
value, if B - A is less than or equals to
NGHTTP2_MAX_CYCLE_DISTANCE, A and B are in the same scale, in other
words, B is really greater than or equal to A. Otherwise, A is a
result of overflow, and it is actually A > B if we consider that
fact. */
#define NGHTTP2_MAX_CYCLE_DISTANCE (16384 * 256 + 255)
static int stream_less(const void *lhsx, const void *rhsx) {
const nghttp2_stream *lhs, *rhs;
lhs = nghttp2_struct_of(lhsx, nghttp2_stream, pq_entry);
rhs = nghttp2_struct_of(rhsx, nghttp2_stream, pq_entry);
if (lhs->cycle == rhs->cycle) {
return lhs->seq < rhs->seq;
}
if (lhs->cycle < rhs->cycle) {
return rhs->cycle - lhs->cycle <= NGHTTP2_MAX_CYCLE_DISTANCE;
}
return lhs->cycle - rhs->cycle > NGHTTP2_MAX_CYCLE_DISTANCE;
}
void nghttp2_stream_init(nghttp2_stream *stream, int32_t stream_id,
uint8_t flags, nghttp2_stream_state initial_state,
int32_t weight, int32_t remote_initial_window_size,
int32_t local_initial_window_size,
void *stream_user_data, nghttp2_mem *mem) {
nghttp2_map_entry_init(&stream->map_entry, (key_type)stream_id);
nghttp2_pq_init(&stream->obq, stream_less, mem);
stream->stream_id = stream_id;
stream->flags = flags;
stream->state = initial_state;
stream->shut_flags = NGHTTP2_SHUT_NONE;
stream->stream_user_data = stream_user_data;
stream->item = NULL;
stream->remote_window_size = remote_initial_window_size;
stream->local_window_size = local_initial_window_size;
stream->recv_window_size = 0;
stream->consumed_size = 0;
stream->recv_reduction = 0;
stream->window_update_queued = 0;
stream->dep_prev = NULL;
stream->dep_next = NULL;
stream->sib_prev = NULL;
stream->sib_next = NULL;
stream->closed_prev = NULL;
stream->closed_next = NULL;
stream->weight = weight;
stream->sum_dep_weight = 0;
stream->http_flags = NGHTTP2_HTTP_FLAG_NONE;
stream->content_length = -1;
stream->recv_content_length = 0;
stream->status_code = -1;
stream->queued = 0;
stream->descendant_last_cycle = 0;
stream->cycle = 0;
stream->pending_penalty = 0;
stream->descendant_next_seq = 0;
stream->seq = 0;
stream->last_writelen = 0;
}
void nghttp2_stream_free(nghttp2_stream *stream) {
nghttp2_pq_free(&stream->obq);
/* We don't free stream->item. If it is assigned to aob, then
active_outbound_item_reset() will delete it. Otherwise,
nghttp2_stream_close() or session_del() will delete it. */
}
void nghttp2_stream_shutdown(nghttp2_stream *stream, nghttp2_shut_flag flag) {
stream->shut_flags = (uint8_t)(stream->shut_flags | flag);
}
/*
* Returns nonzero if |stream| is active. This function does not take
* into account its descendants.
*/
static int stream_active(nghttp2_stream *stream) {
return stream->item &&
(stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_ALL) == 0;
}
/*
* Returns nonzero if |stream| or one of its descendants is active
*/
static int stream_subtree_active(nghttp2_stream *stream) {
return stream_active(stream) || !nghttp2_pq_empty(&stream->obq);
}
/*
* Returns next cycle for |stream|.
*/
static void stream_next_cycle(nghttp2_stream *stream, uint32_t last_cycle) {
uint32_t penalty;
penalty = (uint32_t)stream->last_writelen * NGHTTP2_MAX_WEIGHT +
stream->pending_penalty;
stream->cycle = last_cycle + penalty / (uint32_t)stream->weight;
stream->pending_penalty = penalty % (uint32_t)stream->weight;
}
static int stream_obq_push(nghttp2_stream *dep_stream, nghttp2_stream *stream) {
int rv;
for (; dep_stream && !stream->queued;
stream = dep_stream, dep_stream = dep_stream->dep_prev) {
stream_next_cycle(stream, dep_stream->descendant_last_cycle);
stream->seq = dep_stream->descendant_next_seq++;
DEBUGF("stream: stream=%d obq push cycle=%d\n", stream->stream_id,
stream->cycle);
DEBUGF("stream: push stream %d to stream %d\n", stream->stream_id,
dep_stream->stream_id);
rv = nghttp2_pq_push(&dep_stream->obq, &stream->pq_entry);
if (rv != 0) {
return rv;
}
stream->queued = 1;
}
return 0;
}
/*
* Removes |stream| from parent's obq. If removal of |stream| makes
* parent's obq empty, and parent is not active, then parent is also
* removed. This process is repeated recursively.
*/
static void stream_obq_remove(nghttp2_stream *stream) {
nghttp2_stream *dep_stream;
dep_stream = stream->dep_prev;
if (!stream->queued) {
return;
}
for (; dep_stream; stream = dep_stream, dep_stream = dep_stream->dep_prev) {
DEBUGF("stream: remove stream %d from stream %d\n", stream->stream_id,
dep_stream->stream_id);
nghttp2_pq_remove(&dep_stream->obq, &stream->pq_entry);
assert(stream->queued);
stream->queued = 0;
stream->cycle = 0;
stream->pending_penalty = 0;
stream->descendant_last_cycle = 0;
stream->last_writelen = 0;
if (stream_subtree_active(dep_stream)) {
return;
}
}
}
/*
* Moves |stream| from |src|'s obq to |dest|'s obq. Removal from
* |src|'s obq is just done calling nghttp2_pq_remove(), so it does
* not recursively remove |src| and ancestors, like
* stream_obq_remove().
*/
static int stream_obq_move(nghttp2_stream *dest, nghttp2_stream *src,
nghttp2_stream *stream) {
if (!stream->queued) {
return 0;
}
DEBUGF("stream: remove stream %d from stream %d (move)\n", stream->stream_id,
src->stream_id);
nghttp2_pq_remove(&src->obq, &stream->pq_entry);
stream->queued = 0;
return stream_obq_push(dest, stream);
}
void nghttp2_stream_reschedule(nghttp2_stream *stream) {
nghttp2_stream *dep_stream;
assert(stream->queued);
dep_stream = stream->dep_prev;
for (; dep_stream; stream = dep_stream, dep_stream = dep_stream->dep_prev) {
nghttp2_pq_remove(&dep_stream->obq, &stream->pq_entry);
stream_next_cycle(stream, dep_stream->descendant_last_cycle);
stream->seq = dep_stream->descendant_next_seq++;
nghttp2_pq_push(&dep_stream->obq, &stream->pq_entry);
DEBUGF("stream: stream=%d obq resched cycle=%d\n", stream->stream_id,
stream->cycle);
dep_stream->last_writelen = stream->last_writelen;
}
}
void nghttp2_stream_change_weight(nghttp2_stream *stream, int32_t weight) {
nghttp2_stream *dep_stream;
uint32_t last_cycle;
int32_t old_weight;
uint32_t wlen_penalty;
if (stream->weight == weight) {
return;
}
old_weight = stream->weight;
stream->weight = weight;
dep_stream = stream->dep_prev;
if (!dep_stream) {
return;
}
dep_stream->sum_dep_weight += weight - old_weight;
if (!stream->queued) {
return;
}
nghttp2_pq_remove(&dep_stream->obq, &stream->pq_entry);
wlen_penalty = (uint32_t)stream->last_writelen * NGHTTP2_MAX_WEIGHT;
/* Compute old stream->pending_penalty we used to calculate
stream->cycle */
stream->pending_penalty =
(uint32_t)((stream->pending_penalty + (uint32_t)old_weight -
(wlen_penalty % (uint32_t)old_weight)) %
(uint32_t)old_weight);
last_cycle = stream->cycle -
(wlen_penalty + stream->pending_penalty) / (uint32_t)old_weight;
/* Now we have old stream->pending_penalty and new stream->weight in
place */
stream_next_cycle(stream, last_cycle);
if (stream->cycle < dep_stream->descendant_last_cycle &&
(dep_stream->descendant_last_cycle - stream->cycle) <=
NGHTTP2_MAX_CYCLE_DISTANCE) {
stream->cycle = dep_stream->descendant_last_cycle;
}
/* Continue to use same stream->seq */
nghttp2_pq_push(&dep_stream->obq, &stream->pq_entry);
DEBUGF("stream: stream=%d obq resched cycle=%d\n", stream->stream_id,
stream->cycle);
}
static nghttp2_stream *stream_last_sib(nghttp2_stream *stream) {
for (; stream->sib_next; stream = stream->sib_next)
;
return stream;
}
int32_t nghttp2_stream_dep_distributed_weight(nghttp2_stream *stream,
int32_t weight) {
weight = stream->weight * weight / stream->sum_dep_weight;
return nghttp2_max(1, weight);
}
#ifdef STREAM_DEP_DEBUG
static void ensure_inactive(nghttp2_stream *stream) {
nghttp2_stream *si;
if (stream->queued) {
fprintf(stderr, "stream(%p)=%d, stream->queued = 1; want 0\n", stream,
stream->stream_id);
assert(0);
}
if (stream_active(stream)) {
fprintf(stderr, "stream(%p)=%d, stream_active(stream) = 1; want 0\n",
stream, stream->stream_id);
assert(0);
}
if (!nghttp2_pq_empty(&stream->obq)) {
fprintf(stderr, "stream(%p)=%d, nghttp2_pq_size() = %zu; want 0\n", stream,
stream->stream_id, nghttp2_pq_size(&stream->obq));
assert(0);
}
for (si = stream->dep_next; si; si = si->sib_next) {
ensure_inactive(si);
}
}
static void check_queued(nghttp2_stream *stream) {
nghttp2_stream *si;
int queued;
if (stream->queued) {
if (!stream_subtree_active(stream)) {
fprintf(stderr,
"stream(%p)=%d, stream->queued == 1, but "
"stream_active() == %d and nghttp2_pq_size(&stream->obq) = %zu\n",
stream, stream->stream_id, stream_active(stream),
nghttp2_pq_size(&stream->obq));
assert(0);
}
if (!stream_active(stream)) {
queued = 0;
for (si = stream->dep_next; si; si = si->sib_next) {
if (si->queued) {
++queued;
}
}
if (queued == 0) {
fprintf(stderr,
"stream(%p)=%d, stream->queued == 1, and "
"!stream_active(), but no descendants is queued\n",
stream, stream->stream_id);
assert(0);
}
}
for (si = stream->dep_next; si; si = si->sib_next) {
check_queued(si);
}
} else {
if (stream_active(stream) || !nghttp2_pq_empty(&stream->obq)) {
fprintf(stderr,
"stream(%p) = %d, stream->queued == 0, but "
"stream_active(stream) == %d and "
"nghttp2_pq_size(&stream->obq) = %zu\n",
stream, stream->stream_id, stream_active(stream),
nghttp2_pq_size(&stream->obq));
assert(0);
}
for (si = stream->dep_next; si; si = si->sib_next) {
ensure_inactive(si);
}
}
}
static void check_sum_dep(nghttp2_stream *stream) {
nghttp2_stream *si;
int32_t n = 0;
for (si = stream->dep_next; si; si = si->sib_next) {
n += si->weight;
}
if (n != stream->sum_dep_weight) {
fprintf(stderr, "stream(%p)=%d, sum_dep_weight = %d; want %d\n", stream,
stream->stream_id, n, stream->sum_dep_weight);
assert(0);
}
for (si = stream->dep_next; si; si = si->sib_next) {
check_sum_dep(si);
}
}
static void check_dep_prev(nghttp2_stream *stream) {
nghttp2_stream *si;
for (si = stream->dep_next; si; si = si->sib_next) {
if (si->dep_prev != stream) {
fprintf(stderr, "si->dep_prev = %p; want %p\n", si->dep_prev, stream);
assert(0);
}
check_dep_prev(si);
}
}
#endif /* STREAM_DEP_DEBUG */
#ifdef STREAM_DEP_DEBUG
static void validate_tree(nghttp2_stream *stream) {
nghttp2_stream *si;
if (!stream) {
return;
}
for (; stream->dep_prev; stream = stream->dep_prev)
;
assert(stream->stream_id == 0);
assert(!stream->queued);
fprintf(stderr, "checking...\n");
if (nghttp2_pq_empty(&stream->obq)) {
fprintf(stderr, "root obq empty\n");
for (si = stream->dep_next; si; si = si->sib_next) {
ensure_inactive(si);
}
} else {
for (si = stream->dep_next; si; si = si->sib_next) {
check_queued(si);
}
}
check_sum_dep(stream);
check_dep_prev(stream);
}
#else /* !STREAM_DEP_DEBUG */
static void validate_tree(nghttp2_stream *stream) { (void)stream; }
#endif /* !STREAM_DEP_DEBUG*/
static int stream_update_dep_on_attach_item(nghttp2_stream *stream) {
int rv;
rv = stream_obq_push(stream->dep_prev, stream);
if (rv != 0) {
return rv;
}
validate_tree(stream);
return 0;
}
static int stream_update_dep_on_detach_item(nghttp2_stream *stream) {
if (nghttp2_pq_empty(&stream->obq)) {
stream_obq_remove(stream);
}
validate_tree(stream);
return 0;
}
int nghttp2_stream_attach_item(nghttp2_stream *stream,
nghttp2_outbound_item *item) {
int rv;
assert((stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_ALL) == 0);
assert(stream->item == NULL);
DEBUGF("stream: stream=%d attach item=%p\n", stream->stream_id, item);
stream->item = item;
rv = stream_update_dep_on_attach_item(stream);
if (rv != 0) {
/* This may relave stream->queued == 1, but stream->item == NULL.
But only consequence of this error is fatal one, and session
destruction. In that execution path, these inconsistency does
not matter. */
stream->item = NULL;
return rv;
}
return 0;
}
int nghttp2_stream_detach_item(nghttp2_stream *stream) {
DEBUGF("stream: stream=%d detach item=%p\n", stream->stream_id, stream->item);
stream->item = NULL;
stream->flags = (uint8_t)(stream->flags & ~NGHTTP2_STREAM_FLAG_DEFERRED_ALL);
return stream_update_dep_on_detach_item(stream);
}
int nghttp2_stream_defer_item(nghttp2_stream *stream, uint8_t flags) {
assert(stream->item);
DEBUGF("stream: stream=%d defer item=%p cause=%02x\n", stream->stream_id,
stream->item, flags);
stream->flags |= flags;
return stream_update_dep_on_detach_item(stream);
}
int nghttp2_stream_resume_deferred_item(nghttp2_stream *stream, uint8_t flags) {
assert(stream->item);
DEBUGF("stream: stream=%d resume item=%p flags=%02x\n", stream->stream_id,
stream->item, flags);
stream->flags = (uint8_t)(stream->flags & ~flags);
if (stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_ALL) {
return 0;
}
return stream_update_dep_on_attach_item(stream);
}
int nghttp2_stream_check_deferred_item(nghttp2_stream *stream) {
return stream->item && (stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_ALL);
}
int nghttp2_stream_check_deferred_by_flow_control(nghttp2_stream *stream) {
return stream->item &&
(stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_FLOW_CONTROL);
}
static int update_initial_window_size(int32_t *window_size_ptr,
int32_t new_initial_window_size,
int32_t old_initial_window_size) {
int64_t new_window_size = (int64_t)(*window_size_ptr) +
new_initial_window_size - old_initial_window_size;
if (INT32_MIN > new_window_size ||
new_window_size > NGHTTP2_MAX_WINDOW_SIZE) {
return -1;
}
*window_size_ptr = (int32_t)new_window_size;
return 0;
}
int nghttp2_stream_update_remote_initial_window_size(
nghttp2_stream *stream, int32_t new_initial_window_size,
int32_t old_initial_window_size) {
return update_initial_window_size(&stream->remote_window_size,
new_initial_window_size,
old_initial_window_size);
}
int nghttp2_stream_update_local_initial_window_size(
nghttp2_stream *stream, int32_t new_initial_window_size,
int32_t old_initial_window_size) {
return update_initial_window_size(&stream->local_window_size,
new_initial_window_size,
old_initial_window_size);
}
void nghttp2_stream_promise_fulfilled(nghttp2_stream *stream) {
stream->state = NGHTTP2_STREAM_OPENED;
stream->flags = (uint8_t)(stream->flags & ~NGHTTP2_STREAM_FLAG_PUSH);
}
int nghttp2_stream_dep_find_ancestor(nghttp2_stream *stream,
nghttp2_stream *target) {
for (; stream; stream = stream->dep_prev) {
if (stream == target) {
return 1;
}
}
return 0;
}
int nghttp2_stream_dep_insert(nghttp2_stream *dep_stream,
nghttp2_stream *stream) {
nghttp2_stream *si;
int rv;
DEBUGF("stream: dep_insert dep_stream(%p)=%d, stream(%p)=%d\n", dep_stream,
dep_stream->stream_id, stream, stream->stream_id);
stream->sum_dep_weight = dep_stream->sum_dep_weight;
dep_stream->sum_dep_weight = stream->weight;
if (dep_stream->dep_next) {
for (si = dep_stream->dep_next; si; si = si->sib_next) {
si->dep_prev = stream;
if (si->queued) {
rv = stream_obq_move(stream, dep_stream, si);
if (rv != 0) {
return rv;
}
}
}
if (stream_subtree_active(stream)) {
rv = stream_obq_push(dep_stream, stream);
if (rv != 0) {
return rv;
}
}
stream->dep_next = dep_stream->dep_next;
}
dep_stream->dep_next = stream;
stream->dep_prev = dep_stream;
validate_tree(stream);
return 0;
}
static void set_dep_prev(nghttp2_stream *stream, nghttp2_stream *dep) {
for (; stream; stream = stream->sib_next) {
stream->dep_prev = dep;
}
}
static void link_dep(nghttp2_stream *dep_stream, nghttp2_stream *stream) {
dep_stream->dep_next = stream;
if (stream) {
stream->dep_prev = dep_stream;
}
}
static void link_sib(nghttp2_stream *a, nghttp2_stream *b) {
a->sib_next = b;
if (b) {
b->sib_prev = a;
}
}
static void insert_link_dep(nghttp2_stream *dep_stream,
nghttp2_stream *stream) {
nghttp2_stream *sib_next;
assert(stream->sib_prev == NULL);
sib_next = dep_stream->dep_next;
link_sib(stream, sib_next);
link_dep(dep_stream, stream);
}
static void unlink_sib(nghttp2_stream *stream) {
nghttp2_stream *prev, *next, *dep_next;
prev = stream->sib_prev;
dep_next = stream->dep_next;
assert(prev);
if (dep_next) {
/*
* prev--stream(--sib_next--...)
* |
* dep_next
*/
link_sib(prev, dep_next);
set_dep_prev(dep_next, stream->dep_prev);
if (stream->sib_next) {
link_sib(stream_last_sib(dep_next), stream->sib_next);
}
} else {
/*
* prev--stream(--sib_next--...)
*/
next = stream->sib_next;
prev->sib_next = next;
if (next) {
next->sib_prev = prev;
}
}
}
static void unlink_dep(nghttp2_stream *stream) {
nghttp2_stream *prev, *next, *dep_next;
prev = stream->dep_prev;
dep_next = stream->dep_next;
assert(prev);
if (dep_next) {
/*
* prev
* |
* stream(--sib_next--...)
* |
* dep_next
*/
link_dep(prev, dep_next);
set_dep_prev(dep_next, stream->dep_prev);
if (stream->sib_next) {
link_sib(stream_last_sib(dep_next), stream->sib_next);
}
} else if (stream->sib_next) {
/*
* prev
* |
* stream--sib_next
*/
next = stream->sib_next;
next->sib_prev = NULL;
link_dep(prev, next);
} else {
prev->dep_next = NULL;
}
}
void nghttp2_stream_dep_add(nghttp2_stream *dep_stream,
nghttp2_stream *stream) {
DEBUGF("stream: dep_add dep_stream(%p)=%d, stream(%p)=%d\n", dep_stream,
dep_stream->stream_id, stream, stream->stream_id);
dep_stream->sum_dep_weight += stream->weight;
if (dep_stream->dep_next == NULL) {
link_dep(dep_stream, stream);
} else {
insert_link_dep(dep_stream, stream);
}
validate_tree(stream);
}
int nghttp2_stream_dep_remove(nghttp2_stream *stream) {
nghttp2_stream *dep_prev, *si;
int32_t sum_dep_weight_delta;
int rv;
DEBUGF("stream: dep_remove stream(%p)=%d\n", stream, stream->stream_id);
/* Distribute weight of |stream| to direct descendants */
sum_dep_weight_delta = -stream->weight;
for (si = stream->dep_next; si; si = si->sib_next) {
si->weight = nghttp2_stream_dep_distributed_weight(stream, si->weight);
sum_dep_weight_delta += si->weight;
if (si->queued) {
rv = stream_obq_move(stream->dep_prev, stream, si);
if (rv != 0) {
return rv;
}
}
}
assert(stream->dep_prev);
dep_prev = stream->dep_prev;
dep_prev->sum_dep_weight += sum_dep_weight_delta;
if (stream->queued) {
stream_obq_remove(stream);
}
if (stream->sib_prev) {
unlink_sib(stream);
} else {
unlink_dep(stream);
}
stream->sum_dep_weight = 0;
stream->dep_prev = NULL;
stream->dep_next = NULL;
stream->sib_prev = NULL;
stream->sib_next = NULL;
validate_tree(dep_prev);
return 0;
}
int nghttp2_stream_dep_insert_subtree(nghttp2_stream *dep_stream,
nghttp2_stream *stream) {
nghttp2_stream *last_sib;
nghttp2_stream *dep_next;
nghttp2_stream *si;
int rv;
DEBUGF("stream: dep_insert_subtree dep_stream(%p)=%d stream(%p)=%d\n",
dep_stream, dep_stream->stream_id, stream, stream->stream_id);
stream->sum_dep_weight += dep_stream->sum_dep_weight;
dep_stream->sum_dep_weight = stream->weight;
if (dep_stream->dep_next) {
dep_next = dep_stream->dep_next;
link_dep(dep_stream, stream);
if (stream->dep_next) {
last_sib = stream_last_sib(stream->dep_next);
link_sib(last_sib, dep_next);
} else {
link_dep(stream, dep_next);
}
for (si = dep_next; si; si = si->sib_next) {
si->dep_prev = stream;
if (si->queued) {
rv = stream_obq_move(stream, dep_stream, si);
if (rv != 0) {
return rv;
}
}
}
} else {
link_dep(dep_stream, stream);
}
if (stream_subtree_active(stream)) {
rv = stream_obq_push(dep_stream, stream);
if (rv != 0) {
return rv;
}
}
validate_tree(dep_stream);
return 0;
}
int nghttp2_stream_dep_add_subtree(nghttp2_stream *dep_stream,
nghttp2_stream *stream) {
int rv;
DEBUGF("stream: dep_add_subtree dep_stream(%p)=%d stream(%p)=%d\n",
dep_stream, dep_stream->stream_id, stream, stream->stream_id);
dep_stream->sum_dep_weight += stream->weight;
if (dep_stream->dep_next) {
insert_link_dep(dep_stream, stream);
} else {
link_dep(dep_stream, stream);
}
if (stream_subtree_active(stream)) {
rv = stream_obq_push(dep_stream, stream);
if (rv != 0) {
return rv;
}
}
validate_tree(dep_stream);
return 0;
}
void nghttp2_stream_dep_remove_subtree(nghttp2_stream *stream) {
nghttp2_stream *next, *dep_prev;
DEBUGF("stream: dep_remove_subtree stream(%p)=%d\n", stream,
stream->stream_id);
assert(stream->dep_prev);
dep_prev = stream->dep_prev;
if (stream->sib_prev) {
link_sib(stream->sib_prev, stream->sib_next);
} else {
next = stream->sib_next;
link_dep(dep_prev, next);
if (next) {
next->sib_prev = NULL;
}
}
dep_prev->sum_dep_weight -= stream->weight;
if (stream->queued) {
stream_obq_remove(stream);
}
validate_tree(dep_prev);
stream->sib_prev = NULL;
stream->sib_next = NULL;
stream->dep_prev = NULL;
}
int nghttp2_stream_in_dep_tree(nghttp2_stream *stream) {
return stream->dep_prev || stream->dep_next || stream->sib_prev ||
stream->sib_next;
}
nghttp2_outbound_item *
nghttp2_stream_next_outbound_item(nghttp2_stream *stream) {
nghttp2_pq_entry *ent;
nghttp2_stream *si;
for (;;) {
if (stream_active(stream)) {
/* Update ascendant's descendant_last_cycle here, so that we can
assure that new stream is scheduled based on it. */
for (si = stream; si->dep_prev; si = si->dep_prev) {
si->dep_prev->descendant_last_cycle = si->cycle;
}
return stream->item;
}
ent = nghttp2_pq_top(&stream->obq);
if (!ent) {
return NULL;
}
stream = nghttp2_struct_of(ent, nghttp2_stream, pq_entry);
}
}
nghttp2_stream_proto_state nghttp2_stream_get_state(nghttp2_stream *stream) {
if (stream->flags & NGHTTP2_STREAM_FLAG_CLOSED) {
return NGHTTP2_STREAM_STATE_CLOSED;
}
if (stream->flags & NGHTTP2_STREAM_FLAG_PUSH) {
if (stream->shut_flags & NGHTTP2_SHUT_RD) {
return NGHTTP2_STREAM_STATE_RESERVED_LOCAL;
}
if (stream->shut_flags & NGHTTP2_SHUT_WR) {
return NGHTTP2_STREAM_STATE_RESERVED_REMOTE;
}
}
if (stream->shut_flags & NGHTTP2_SHUT_RD) {
return NGHTTP2_STREAM_STATE_HALF_CLOSED_REMOTE;
}
if (stream->shut_flags & NGHTTP2_SHUT_WR) {
return NGHTTP2_STREAM_STATE_HALF_CLOSED_LOCAL;
}
if (stream->state == NGHTTP2_STREAM_IDLE) {
return NGHTTP2_STREAM_STATE_IDLE;
}
return NGHTTP2_STREAM_STATE_OPEN;
}
nghttp2_stream *nghttp2_stream_get_parent(nghttp2_stream *stream) {
return stream->dep_prev;
}
nghttp2_stream *nghttp2_stream_get_next_sibling(nghttp2_stream *stream) {
return stream->sib_next;
}
nghttp2_stream *nghttp2_stream_get_previous_sibling(nghttp2_stream *stream) {
return stream->sib_prev;
}
nghttp2_stream *nghttp2_stream_get_first_child(nghttp2_stream *stream) {
return stream->dep_next;
}
int32_t nghttp2_stream_get_weight(nghttp2_stream *stream) {
return stream->weight;
}
int32_t nghttp2_stream_get_sum_dependency_weight(nghttp2_stream *stream) {
return stream->sum_dep_weight;
}
int32_t nghttp2_stream_get_stream_id(nghttp2_stream *stream) {
return stream->stream_id;
}