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tracer.go
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tracer.go
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package utils
import (
"context"
"fmt"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
"go.opentelemetry.io/otel/trace"
)
func NewTracer(svcName string) (trace.Tracer, error) {
// create otlp exporter, notice that here we are using insecure option
// because we just want to export the trace locally, also notice that
// here we don't set any endpoint because by default the otel will load
// the endpoint from the environment variable `OTEL_EXPORTER_OTLP_ENDPOINT`
exporter, err := otlptrace.New(
context.Background(),
otlptracehttp.NewClient(otlptracehttp.WithInsecure()),
)
if err != nil {
return nil, fmt.Errorf("unable to initialize exporter due: %w", err)
}
// initialize tracer provider
tp := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithBatcher(exporter),
sdktrace.WithResource(resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String(svcName),
)),
)
// set tracer provider and propagator properly, this is to ensure all
// instrumentation library could run well
otel.SetTracerProvider(tp)
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
// returns tracer
return otel.Tracer(svcName), nil
}