1 // Copyright 2023 gRPC authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include <grpc/support/port_platform.h>
16
17 #include "src/core/lib/transport/metadata_info.h"
18
19 #include "src/core/lib/slice/slice.h"
20
21 namespace grpc_core {
22
23 class MetadataSizesAnnotation::MetadataSizeEncoder {
24 public:
MetadataSizeEncoder(std::string & summary)25 explicit MetadataSizeEncoder(std::string& summary) : summary_(summary) {}
26
Encode(const Slice & key,const Slice & value)27 void Encode(const Slice& key, const Slice& value) {
28 AddToSummary(key.as_string_view(), value.size());
29 }
30
31 template <typename Key, typename Value>
Encode(Key,const Value & value)32 void Encode(Key, const Value& value) {
33 AddToSummary(Key::key(), EncodedSizeOfKey(Key(), value));
34 }
35
36 private:
AddToSummary(absl::string_view key,size_t value_length)37 void AddToSummary(absl::string_view key,
38 size_t value_length) GPR_ATTRIBUTE_NOINLINE {
39 absl::StrAppend(&summary_, key, ":",
40 hpack_constants::SizeForEntry(key.size(), value_length),
41 ",");
42 }
43 std::string& summary_;
44 };
45
ToString() const46 std::string MetadataSizesAnnotation::ToString() const {
47 std::string metadata_annotation =
48 absl::StrCat("gRPC metadata soft_limit:", soft_limit_,
49 ",hard_limit:", hard_limit_, ",");
50 MetadataSizeEncoder encoder(metadata_annotation);
51 metadata_buffer_->Encode(&encoder);
52 return metadata_annotation;
53 }
54
55 } // namespace grpc_core