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carrier.go
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carrier.go
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// Copyright 2020 Douyu
//
// 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.
package xtrace
import (
"go.opentelemetry.io/otel/propagation"
"google.golang.org/grpc/metadata"
)
// assert that MetadataReaderWriter implements the TextMapCarrier interface
var _ propagation.TextMapCarrier = (*MetadataReaderWriter)(nil)
// MetadataReaderWriter ...
type MetadataReaderWriter metadata.MD
func (m MetadataReaderWriter) Get(key string) string {
values := metadata.MD(m).Get(key)
if len(values) == 0 {
return ""
}
return values[0]
}
func (m MetadataReaderWriter) Set(key, value string) {
metadata.MD(m).Set(key, value)
}
func (m MetadataReaderWriter) Keys() []string {
keys := make([]string, 0, len(m))
for k := range metadata.MD(m) {
keys = append(keys, k)
}
return keys
}