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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "src/core/ext/transport/chttp2/transport/frame_window_update.h"
#include "src/core/ext/transport/chttp2/transport/internal.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
grpc_slice grpc_chttp2_window_update_create(
uint32_t id, uint32_t window_update, grpc_transport_one_way_stats *stats) {
static const size_t frame_size = 13;
grpc_slice slice = GRPC_SLICE_MALLOC(frame_size);
stats->header_bytes += frame_size;
uint8_t *p = GRPC_SLICE_START_PTR(slice);
GPR_ASSERT(window_update);
*p++ = 0;
*p++ = 0;
*p++ = 4;
*p++ = GRPC_CHTTP2_FRAME_WINDOW_UPDATE;
*p++ = 0;
*p++ = (uint8_t)(id >> 24);
*p++ = (uint8_t)(id >> 16);
*p++ = (uint8_t)(id >> 8);
*p++ = (uint8_t)(id);
*p++ = (uint8_t)(window_update >> 24);
*p++ = (uint8_t)(window_update >> 16);
*p++ = (uint8_t)(window_update >> 8);
*p++ = (uint8_t)(window_update);
return slice;
}
grpc_error *grpc_chttp2_window_update_parser_begin_frame(
grpc_chttp2_window_update_parser *parser, uint32_t length, uint8_t flags) {
if (flags || length != 4) {
char *msg;
gpr_asprintf(&msg, "invalid window update: length=%d, flags=%02x", length,
flags);
grpc_error *err = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
gpr_free(msg);
return err;
}
parser->byte = 0;
parser->amount = 0;
return GRPC_ERROR_NONE;
}
grpc_error *grpc_chttp2_window_update_parser_parse(
grpc_exec_ctx *exec_ctx, void *parser, grpc_chttp2_transport *t,
grpc_chttp2_stream *s, grpc_slice slice, int is_last) {
uint8_t *const beg = GRPC_SLICE_START_PTR(slice);
uint8_t *const end = GRPC_SLICE_END_PTR(slice);
uint8_t *cur = beg;
grpc_chttp2_window_update_parser *p =
(grpc_chttp2_window_update_parser *)parser;
while (p->byte != 4 && cur != end) {
p->amount |= ((uint32_t)*cur) << (8 * (3 - p->byte));
cur++;
p->byte++;
}
if (s != NULL) {
s->stats.incoming.framing_bytes += (uint32_t)(end - cur);
}
if (p->byte == 4) {
uint32_t received_update = p->amount;
if (received_update == 0 || (received_update & 0x80000000u)) {
char *msg;
gpr_asprintf(&msg, "invalid window update bytes: %d", p->amount);
grpc_error *err = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
gpr_free(msg);
return err;
}
GPR_ASSERT(is_last);
if (t->incoming_stream_id != 0) {
if (s != NULL) {
s->flow_control->RecvUpdate(received_update);
if (grpc_chttp2_list_remove_stalled_by_stream(t, s)) {
grpc_chttp2_mark_stream_writable(exec_ctx, t, s);
grpc_chttp2_initiate_write(
exec_ctx, t,
GRPC_CHTTP2_INITIATE_WRITE_FLOW_CONTROL_UNSTALLED_BY_UPDATE);
}
}
} else {
bool was_zero = t->flow_control->remote_window() <= 0;
t->flow_control->RecvUpdate(received_update);
bool is_zero = t->flow_control->remote_window() <= 0;
if (was_zero && !is_zero) {
grpc_chttp2_initiate_write(
exec_ctx, t,
GRPC_CHTTP2_INITIATE_WRITE_TRANSPORT_FLOW_CONTROL_UNSTALLED);
}
}
}
return GRPC_ERROR_NONE;
}
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