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tracer.go
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tracer.go
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package tracing
import (
"context"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.20.0"
"go.opentelemetry.io/otel/trace"
)
const ServiceName = "cron"
// Tracer returns the registered tracer for this service. It defaults to a no-op trace.Tracer if not yet initialized.
func Tracer() trace.Tracer {
return otel.GetTracerProvider().Tracer(ServiceName)
}
type ShutdownFunc func(ctx context.Context) error
func Init(traceExporter sdktrace.SpanExporter) (ShutdownFunc, error) {
res, err := resource.New(context.Background(),
resource.WithAttributes(semconv.ServiceName(ServiceName)), // the service name used to display traces in backends
)
if err != nil {
return nil, err
}
// Register the trace exporter with a TracerProvider, using a batch
// span processor to aggregate spans before export.
bsp := sdktrace.NewBatchSpanProcessor(traceExporter)
tracerProvider := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithResource(res),
sdktrace.WithSpanProcessor(bsp),
)
// the tracer can now be referenced by the service name with a `otel.GetTracerProvider().Tracer(ServiceName)` call
otel.SetTracerProvider(tracerProvider)
// set global propagator to tracecontext (the default is no-op).
otel.SetTextMapPropagator(propagation.TraceContext{})
// Shutdown will flush any remaining spans and shut down the exporter.
return tracerProvider.Shutdown, nil
}