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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_ping.h"
#include "src/core/ext/transport/chttp2/transport/internal.h"
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
static bool g_disable_ping_ack = false;
grpc_slice grpc_chttp2_ping_create(uint8_t ack, uint64_t opaque_8bytes) {
grpc_slice slice = GRPC_SLICE_MALLOC(9 + 8);
uint8_t *p = GRPC_SLICE_START_PTR(slice);
*p++ = 0;
*p++ = 0;
*p++ = 8;
*p++ = GRPC_CHTTP2_FRAME_PING;
*p++ = ack ? 1 : 0;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = (uint8_t)(opaque_8bytes >> 56);
*p++ = (uint8_t)(opaque_8bytes >> 48);
*p++ = (uint8_t)(opaque_8bytes >> 40);
*p++ = (uint8_t)(opaque_8bytes >> 32);
*p++ = (uint8_t)(opaque_8bytes >> 24);
*p++ = (uint8_t)(opaque_8bytes >> 16);
*p++ = (uint8_t)(opaque_8bytes >> 8);
*p++ = (uint8_t)(opaque_8bytes);
return slice;
}
grpc_error *grpc_chttp2_ping_parser_begin_frame(grpc_chttp2_ping_parser *parser,
uint32_t length,
uint8_t flags) {
if (flags & 0xfe || length != 8) {
char *msg;
gpr_asprintf(&msg, "invalid ping: length=%d, flags=%02x", length, flags);
grpc_error *error = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
gpr_free(msg);
return error;
}
parser->byte = 0;
parser->is_ack = flags;
parser->opaque_8bytes = 0;
return GRPC_ERROR_NONE;
}
grpc_error *grpc_chttp2_ping_parser_parse(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_ping_parser *p = (grpc_chttp2_ping_parser *)parser;
while (p->byte != 8 && cur != end) {
p->opaque_8bytes |= (((uint64_t)*cur) << (56 - 8 * p->byte));
cur++;
p->byte++;
}
if (p->byte == 8) {
GPR_ASSERT(is_last);
if (p->is_ack) {
grpc_chttp2_ack_ping(t, p->opaque_8bytes);
} else {
if (!t->is_client) {
grpc_millis now = grpc_exec_ctx_now();
grpc_millis next_allowed_ping =
t->ping_recv_state.last_ping_recv_time +
t->ping_policy.min_recv_ping_interval_without_data;
if (t->keepalive_permit_without_calls == 0 &&
grpc_chttp2_stream_map_size(&t->stream_map) == 0) {
/* According to RFC1122, the interval of TCP Keep-Alive is default to
no less than two hours. When there is no outstanding streams, we
restrict the number of PINGS equivalent to TCP Keep-Alive. */
next_allowed_ping =
t->ping_recv_state.last_ping_recv_time + 7200 * GPR_MS_PER_SEC;
}
if (next_allowed_ping > now) {
grpc_chttp2_add_ping_strike(t);
}
t->ping_recv_state.last_ping_recv_time = now;
}
if (!g_disable_ping_ack) {
if (t->ping_ack_count == t->ping_ack_capacity) {
t->ping_ack_capacity = GPR_MAX(t->ping_ack_capacity * 3 / 2, 3);
t->ping_acks = (uint64_t *)gpr_realloc(
t->ping_acks, t->ping_ack_capacity * sizeof(*t->ping_acks));
}
t->ping_acks[t->ping_ack_count++] = p->opaque_8bytes;
grpc_chttp2_initiate_write(t, GRPC_CHTTP2_INITIATE_WRITE_PING_RESPONSE);
}
}
}
return GRPC_ERROR_NONE;
}
void grpc_set_disable_ping_ack(bool disable_ping_ack) {
g_disable_ping_ack = disable_ping_ack;
}
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