| /* |
| * |
| * 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(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_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(exec_ctx, t, p->opaque_8bytes); |
| } else { |
| if (!t->is_client) { |
| gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC); |
| gpr_timespec next_allowed_ping = |
| gpr_time_add(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 = |
| gpr_time_add(t->ping_recv_state.last_ping_recv_time, |
| gpr_time_from_seconds(7200, GPR_TIMESPAN)); |
| } |
| |
| if (gpr_time_cmp(next_allowed_ping, now) > 0) { |
| grpc_chttp2_add_ping_strike(exec_ctx, 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(exec_ctx, 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; |
| } |