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tracer.go
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tracer.go
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package tracer
import (
"context"
"log"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/zipkin"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.12.0"
)
// Init creates a new trace provider instance and registers it as global trace provider.
func Init(serviceName string, reporterURI string, probability float64, log *log.Logger) (func(context.Context) error, error) {
exporter, err := zipkin.New(reporterURI, zipkin.WithLogger(log))
if err != nil {
return nil, err
}
batcher := sdktrace.NewBatchSpanProcessor(exporter)
// By default the returned TracerProvider is configured with:
// - a ParentBased(AlwaysSample) Sampler
// - a random number IDGenerator
// - the resource.Default() Resource
// - the default SpanLimits
tp := sdktrace.NewTracerProvider(
sdktrace.WithSpanProcessor(batcher),
sdktrace.WithResource(resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String("zipkin-search"),
)),
)
// TODO: Production mode configuarion
// TODO: sdktrace.WithConfig(sdktrace.Config{DefaultSampler: sdktrace.ProbabilitySampler(probability)}),
otel.SetTracerProvider(tp)
return tp.Shutdown, nil
}