You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45 lines
1.1 KiB
45 lines
1.1 KiB
package tracing
|
|
|
|
import (
|
|
"context"
|
|
|
|
"github.com/go-kratos/kratos/v2"
|
|
"github.com/go-kratos/kratos/v2/metadata"
|
|
"go.opentelemetry.io/otel/propagation"
|
|
)
|
|
|
|
const serviceHeader = "x-md-service-name"
|
|
|
|
// Metadata is tracing metadata propagator
|
|
type Metadata struct{}
|
|
|
|
var _ propagation.TextMapPropagator = Metadata{}
|
|
|
|
// Inject sets metadata key-values from ctx into the carrier.
|
|
func (b Metadata) Inject(ctx context.Context, carrier propagation.TextMapCarrier) {
|
|
app, ok := kratos.FromContext(ctx)
|
|
if ok {
|
|
carrier.Set(serviceHeader, app.Name())
|
|
}
|
|
}
|
|
|
|
// Extract returns a copy of parent with the metadata from the carrier added.
|
|
func (b Metadata) Extract(parent context.Context, carrier propagation.TextMapCarrier) context.Context {
|
|
name := carrier.Get(serviceHeader)
|
|
if name == "" {
|
|
return parent
|
|
}
|
|
if md, ok := metadata.FromServerContext(parent); ok {
|
|
md.Set(serviceHeader, name)
|
|
return parent
|
|
}
|
|
md := metadata.New()
|
|
md.Set(serviceHeader, name)
|
|
parent = metadata.NewServerContext(parent, md)
|
|
return parent
|
|
}
|
|
|
|
// Fields returns the keys who's values are set with Inject.
|
|
func (b Metadata) Fields() []string {
|
|
return []string{serviceHeader}
|
|
}
|
|
|