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const.go
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const.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 trace
import (
"context"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"github.com/opentracing/opentracing-go/log"
"google.golang.org/grpc/metadata"
)
// CustomTag ...
func CustomTag(key string, val interface{}) opentracing.Tag {
return opentracing.Tag{
Key: key,
Value: val,
}
}
// TagComponent ...
func TagComponent(component string) opentracing.Tag {
return opentracing.Tag{
Key: "component",
Value: component,
}
}
// TagSpanKind ...
func TagSpanKind(kind string) opentracing.Tag {
return opentracing.Tag{
Key: "span.kind",
Value: kind,
}
}
// TagSpanURL ...
func TagSpanURL(url string) opentracing.Tag {
return opentracing.Tag{
Key: "span.url",
Value: url,
}
}
// FromIncomingContext ...
func FromIncomingContext(ctx context.Context) opentracing.StartSpanOption {
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
md = metadata.New(nil)
}
sc, err := opentracing.GlobalTracer().Extract(opentracing.HTTPHeaders, MetadataReaderWriter{MD: md})
if err != nil {
return NullStartSpanOption{}
}
return ext.RPCServerOption(sc)
}
// HeaderExtractor ...
func HeaderExtractor(hdr map[string][]string) opentracing.StartSpanOption {
sc, err := opentracing.GlobalTracer().Extract(opentracing.HTTPHeaders, MetadataReaderWriter{MD: hdr})
if err != nil {
return NullStartSpanOption{}
}
return opentracing.ChildOf(sc)
}
type hdrRequestKey struct{}
// HeaderInjector ...
func HeaderInjector(ctx context.Context, hdr map[string][]string) context.Context {
span := opentracing.SpanFromContext(ctx)
err := opentracing.GlobalTracer().Inject(span.Context(), opentracing.HTTPHeaders, MetadataReaderWriter{MD: hdr})
if err != nil {
span.LogFields(log.String("event", "inject failed"), log.Error(err))
return ctx
}
return context.WithValue(ctx, hdrRequestKey{}, hdr)
}
// MetadataExtractor ...
func MetadataExtractor(md map[string][]string) opentracing.StartSpanOption {
sc, err := opentracing.GlobalTracer().Extract(opentracing.HTTPHeaders, MetadataReaderWriter{MD: md})
if err != nil {
return NullStartSpanOption{}
}
return opentracing.ChildOf(sc)
}
// MetadataInjector ...
func MetadataInjector(ctx context.Context, md metadata.MD) context.Context {
span := opentracing.SpanFromContext(ctx)
err := opentracing.GlobalTracer().Inject(span.Context(), opentracing.HTTPHeaders, MetadataReaderWriter{MD: md})
if err != nil {
span.LogFields(log.String("event", "inject failed"), log.Error(err))
return ctx
}
return metadata.NewOutgoingContext(ctx, md)
}
// NullStartSpanOption ...
type NullStartSpanOption struct{}
// Apply ...
func (sso NullStartSpanOption) Apply(options *opentracing.StartSpanOptions) {}