/
trace.go
80 lines (72 loc) · 2.29 KB
/
trace.go
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package trace
import (
"context"
"github.com/go-kratos/kratos/v2"
"github.com/go-kratos/kratos/v2/metadata"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/jaeger"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
tracesdk "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
"strings"
)
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 {
var builder strings.Builder
for _, str := range []string{app.Name(), ".", app.ID()} {
builder.WriteString(str)
}
carrier.Set(serviceHeader, builder.String())
}
}
// 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}
}
func SetTracerProvider(url, token, service, hostname string) (*tracesdk.TracerProvider, error) {
var builder strings.Builder
for _, str := range []string{service, ".", hostname} {
builder.WriteString(str)
}
exp, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(url)))
if err != nil {
return nil, err
}
tp := tracesdk.NewTracerProvider(
tracesdk.WithSampler(tracesdk.ParentBased(tracesdk.TraceIDRatioBased(0.5))),
tracesdk.WithBatcher(exp),
tracesdk.WithResource(resource.NewSchemaless(
semconv.ServiceNameKey.String(builder.String()),
attribute.String("exporter", "jaeger"),
attribute.Float64("float", 312.23),
attribute.KeyValue{
Key: "token", Value: attribute.StringValue(token),
},
)),
)
otel.SetTracerProvider(tp)
return tp, nil
}