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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/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.7.0"
"go.opentelemetry.io/otel/trace"
"go.opentelemetry.io/otel/trace/noop"
"go.uber.org/zap"
)
func New(cfg Config, logger *zap.Logger) trace.Tracer {
if !cfg.Enabled {
return noop.NewTracerProvider().Tracer("snapp.dispatching")
}
exporter, err := otlptracegrpc.New(
context.Background(),
otlptracegrpc.WithEndpoint(cfg.Endpoint), otlptracegrpc.WithInsecure(),
)
if err != nil {
logger.Fatal("failed to initialize export pipeline for traces (otlp with grpc)", zap.Error(err))
}
res, err := resource.Merge(
resource.Default(),
resource.NewSchemaless(
semconv.ServiceNamespaceKey.String("snapp.dispatching"),
semconv.ServiceNameKey.String("soteria"),
),
)
if err != nil {
panic(err)
}
bsp := sdktrace.NewBatchSpanProcessor(exporter)
tp := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.ParentBased(sdktrace.TraceIDRatioBased(cfg.Ratio))),
sdktrace.WithSpanProcessor(bsp),
sdktrace.WithResource(res),
)
otel.SetTracerProvider(tp)
// register the TraceContext propagator globally.
var tc propagation.TraceContext
otel.SetTextMapPropagator(tc)
tracer := otel.Tracer("dispatching/soteria")
return tracer
}