1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
// Copyright 2022 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 <grpc/support/port_platform.h>
#include "src/core/ext/transport/chaotic_good/frame_header.h"
#include <cstdint>
#include "absl/status/status.h"
#include "absl/strings/str_cat.h"
#include <grpc/support/log.h>
namespace grpc_core {
namespace chaotic_good {
namespace {
void WriteLittleEndianUint32(uint32_t value, uint8_t* data) {
data[0] = static_cast<uint8_t>(value);
data[1] = static_cast<uint8_t>(value >> 8);
data[2] = static_cast<uint8_t>(value >> 16);
data[3] = static_cast<uint8_t>(value >> 24);
}
uint32_t ReadLittleEndianUint32(const uint8_t* data) {
return static_cast<uint32_t>(data[0]) |
(static_cast<uint32_t>(data[1]) << 8) |
(static_cast<uint32_t>(data[2]) << 16) |
(static_cast<uint32_t>(data[3]) << 24);
}
} // namespace
// Serializes a frame header into a buffer of 24 bytes.
void FrameHeader::Serialize(uint8_t* data) const {
WriteLittleEndianUint32(
static_cast<uint32_t>(type) | (flags.ToInt<uint32_t>() << 8), data);
if (flags.is_set(0)) GPR_ASSERT(header_length > 0);
WriteLittleEndianUint32(stream_id, data + 4);
WriteLittleEndianUint32(header_length, data + 8);
WriteLittleEndianUint32(message_length, data + 12);
WriteLittleEndianUint32(message_padding, data + 16);
WriteLittleEndianUint32(trailer_length, data + 20);
}
// Parses a frame header from a buffer of 24 bytes. All 24 bytes are consumed.
absl::StatusOr<FrameHeader> FrameHeader::Parse(const uint8_t* data) {
FrameHeader header;
const uint32_t type_and_flags = ReadLittleEndianUint32(data);
header.type = static_cast<FrameType>(type_and_flags & 0xff);
const uint32_t flags = type_and_flags >> 8;
if (flags > 7) return absl::InvalidArgumentError("Invalid flags");
header.flags = BitSet<3>::FromInt(flags);
header.stream_id = ReadLittleEndianUint32(data + 4);
header.header_length = ReadLittleEndianUint32(data + 8);
if (header.flags.is_set(0) && header.header_length <= 0) {
return absl::InvalidArgumentError(
absl::StrCat("Invalid header length: ", header.header_length));
}
header.message_length = ReadLittleEndianUint32(data + 12);
header.message_padding = ReadLittleEndianUint32(data + 16);
header.trailer_length = ReadLittleEndianUint32(data + 20);
return header;
}
uint32_t FrameHeader::GetFrameLength() const {
// In chaotic-good transport design, message and message padding are sent
// through different channel. So not included in the frame length calculation.
uint32_t frame_length = header_length + trailer_length;
return frame_length;
}
std::string FrameHeader::ToString() const {
return absl::StrFormat(
"[type=0x%02x, flags=0x%02x, stream_id=%d, header_length=%d, "
"message_length=%d, message_padding=%d, trailer_length=%d]",
static_cast<uint8_t>(type), flags.ToInt<uint8_t>(), stream_id,
header_length, message_length, message_padding, trailer_length);
}
} // namespace chaotic_good
} // namespace grpc_core
|
