feat: setup tracer

tracer/tracer.go

@@ -0,0 +1,47 @@
+package tracer
+
+import (
+	"context"
+
+	"github.com/isd-sgcu/rpkm67-checkin/config"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
+	"go.opentelemetry.io/otel/propagation"
+	"go.opentelemetry.io/otel/sdk/resource"
+	"go.opentelemetry.io/otel/sdk/trace"
+	semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
+)
+
+func New(conf *config.Config) (*trace.TracerProvider, error) {
+	exporter, err := otlptracegrpc.New(
+		context.Background(),
+		otlptracegrpc.WithInsecure(),
+		otlptracegrpc.WithEndpoint(conf.Tracer.Endpoint),
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	var environment string
+	if conf.App.IsDevelopment() {
+		environment = "development"
+	} else {
+		environment = "production"
+	}
+
+	tp := trace.NewTracerProvider(
+		trace.WithBatcher(exporter),
+		trace.WithResource(
+			resource.NewWithAttributes(
+				semconv.SchemaURL,
+				semconv.ServiceNameKey.String(conf.App.ServiceName),
+				attribute.String("environment", environment),
+			),
+		),
+	)
+	otel.SetTracerProvider(tp)
+	otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
+
+	return tp, nil
+}