3 * Copyright 2015 gRPC authors.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
19 #include <grpc/support/port_platform.h>
21 #include "src/core/ext/transport/chttp2/transport/frame_rst_stream.h"
23 #include "absl/strings/str_cat.h"
24 #include "absl/strings/str_format.h"
26 #include <grpc/support/alloc.h>
27 #include <grpc/support/log.h>
29 #include "src/core/ext/transport/chttp2/transport/frame.h"
30 #include "src/core/ext/transport/chttp2/transport/internal.h"
31 #include "src/core/lib/gprpp/memory.h"
32 #include "src/core/lib/transport/http2_errors.h"
34 grpc_slice grpc_chttp2_rst_stream_create(uint32_t id, uint32_t code,
35 grpc_transport_one_way_stats* stats) {
36 static const size_t frame_size = 13;
37 grpc_slice slice = GRPC_SLICE_MALLOC(frame_size);
38 if (stats != nullptr) stats->framing_bytes += frame_size;
39 uint8_t* p = GRPC_SLICE_START_PTR(slice);
46 *p++ = GRPC_CHTTP2_FRAME_RST_STREAM;
50 *p++ = static_cast<uint8_t>(id >> 24);
51 *p++ = static_cast<uint8_t>(id >> 16);
52 *p++ = static_cast<uint8_t>(id >> 8);
53 *p++ = static_cast<uint8_t>(id);
55 *p++ = static_cast<uint8_t>(code >> 24);
56 *p++ = static_cast<uint8_t>(code >> 16);
57 *p++ = static_cast<uint8_t>(code >> 8);
58 *p++ = static_cast<uint8_t>(code);
63 void grpc_chttp2_add_rst_stream_to_next_write(
64 grpc_chttp2_transport* t, uint32_t id, uint32_t code,
65 grpc_transport_one_way_stats* stats) {
66 t->num_pending_induced_frames++;
67 grpc_slice_buffer_add(&t->qbuf,
68 grpc_chttp2_rst_stream_create(id, code, stats));
71 grpc_error_handle grpc_chttp2_rst_stream_parser_begin_frame(
72 grpc_chttp2_rst_stream_parser* parser, uint32_t length, uint8_t flags) {
74 return GRPC_ERROR_CREATE_FROM_CPP_STRING(absl::StrFormat(
75 "invalid rst_stream: length=%d, flags=%02x", length, flags));
78 return GRPC_ERROR_NONE;
81 grpc_error_handle grpc_chttp2_rst_stream_parser_parse(void* parser,
82 grpc_chttp2_transport* t,
83 grpc_chttp2_stream* s,
84 const grpc_slice& slice,
86 const uint8_t* const beg = GRPC_SLICE_START_PTR(slice);
87 const uint8_t* const end = GRPC_SLICE_END_PTR(slice);
88 const uint8_t* cur = beg;
89 grpc_chttp2_rst_stream_parser* p =
90 static_cast<grpc_chttp2_rst_stream_parser*>(parser);
92 while (p->byte != 4 && cur != end) {
93 p->reason_bytes[p->byte] = *cur;
97 s->stats.incoming.framing_bytes += static_cast<uint64_t>(end - cur);
101 uint32_t reason = ((static_cast<uint32_t>(p->reason_bytes[0])) << 24) |
102 ((static_cast<uint32_t>(p->reason_bytes[1])) << 16) |
103 ((static_cast<uint32_t>(p->reason_bytes[2])) << 8) |
104 ((static_cast<uint32_t>(p->reason_bytes[3])));
105 grpc_error_handle error = GRPC_ERROR_NONE;
106 if (reason != GRPC_HTTP2_NO_ERROR || s->metadata_buffer[1].size == 0) {
107 error = grpc_error_set_int(
109 GRPC_ERROR_CREATE_FROM_STATIC_STRING("RST_STREAM"),
110 GRPC_ERROR_STR_GRPC_MESSAGE,
111 grpc_slice_from_cpp_string(absl::StrCat(
112 "Received RST_STREAM with error code ", reason))),
113 GRPC_ERROR_INT_HTTP2_ERROR, static_cast<intptr_t>(reason));
115 grpc_chttp2_mark_stream_closed(t, s, true, true, error);
118 return GRPC_ERROR_NONE;