feat: first version.

tracer.go

@@ -0,0 +1,84 @@
+package bootstrap
+
+import (
+	"errors"
+
+	"go.opentelemetry.io/otel/exporters/jaeger"
+	"go.opentelemetry.io/otel/exporters/zipkin"
+
+	"github.com/tx7do/kratos-bootstrap/gen/api/go/conf/v1"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/sdk/resource"
+	traceSdk "go.opentelemetry.io/otel/sdk/trace"
+	semConv "go.opentelemetry.io/otel/semconv/v1.4.0"
+)
+
+// NewJaegerExporter 创建一个jaeger导出器
+func NewJaegerExporter(endpoint string) (traceSdk.SpanExporter, error) {
+	return jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(endpoint)))
+}
+
+// NewZipkinExporter 创建一个zipkin导出器
+func NewZipkinExporter(endpoint string) (traceSdk.SpanExporter, error) {
+	return zipkin.New(endpoint)
+}
+
+// NewTracerExporter 创建一个导出器，支持：jaeger和zipkin
+func NewTracerExporter(exporterName, endpoint string) (traceSdk.SpanExporter, error) {
+	if exporterName == "" {
+		exporterName = "jaeger"
+	}
+
+	switch exporterName {
+	case "jaeger":
+		return NewJaegerExporter(endpoint)
+	case "zipkin":
+		return NewZipkinExporter(endpoint)
+	default:
+		return nil, errors.New("exporter type not support")
+	}
+}
+
+// NewTracerProvider 创建一个链路追踪器
+func NewTracerProvider(cfg *conf.Tracer, serviceInfo *ServiceInfo) error {
+	if cfg == nil {
+		return errors.New("tracer config is nil")
+	}
+
+	if cfg.Sampler == 0 {
+		cfg.Sampler = 1.0
+	}
+
+	if cfg.Env == "" {
+		cfg.Env = "dev"
+	}
+
+	opts := []traceSdk.TracerProviderOption{
+		traceSdk.WithSampler(traceSdk.ParentBased(traceSdk.TraceIDRatioBased(cfg.Sampler))),
+		traceSdk.WithResource(resource.NewSchemaless(
+			semConv.ServiceNameKey.String(serviceInfo.Name),
+			semConv.ServiceVersionKey.String(serviceInfo.Version),
+			semConv.ServiceInstanceIDKey.String(serviceInfo.Id),
+			attribute.String("env", cfg.Env),
+		)),
+	}
+
+	if len(cfg.Endpoint) > 0 {
+		exp, err := NewTracerExporter(cfg.Batcher, cfg.Endpoint)
+		if err != nil {
+			panic(err)
+		}
+
+		opts = append(opts, traceSdk.WithBatcher(exp))
+	}
+
+	tp := traceSdk.NewTracerProvider(opts...)
+	if tp == nil {
+		return errors.New("create tracer provider failed")
+	}
+
+	otel.SetTracerProvider(tp)
+
+	return nil
+}