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100 lines
2.4 KiB
Go
100 lines
2.4 KiB
Go
package trace
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import (
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"context"
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"fmt"
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"sync"
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"github.com/zeromicro/go-zero/core/lang"
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"github.com/zeromicro/go-zero/core/logx"
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/exporters/jaeger"
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"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
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"go.opentelemetry.io/otel/exporters/zipkin"
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"go.opentelemetry.io/otel/sdk/resource"
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sdktrace "go.opentelemetry.io/otel/sdk/trace"
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semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
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"google.golang.org/grpc"
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)
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const (
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kindJaeger = "jaeger"
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kindZipkin = "zipkin"
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kindGrpc = "grpc"
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)
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var (
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agents = make(map[string]lang.PlaceholderType)
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lock sync.Mutex
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tp *sdktrace.TracerProvider
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)
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// StartAgent starts a opentelemetry agent.
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func StartAgent(c Config) {
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lock.Lock()
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defer lock.Unlock()
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_, ok := agents[c.Endpoint]
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if ok {
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return
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}
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// if error happens, let later calls run.
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if err := startAgent(c); err != nil {
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return
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}
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agents[c.Endpoint] = lang.Placeholder
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}
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// StopAgent shuts down the span processors in the order they were registered.
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func StopAgent() {
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_ = tp.Shutdown(context.Background())
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}
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func createExporter(c Config) (sdktrace.SpanExporter, error) {
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// Just support jaeger and zipkin now, more for later
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switch c.Batcher {
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case kindJaeger:
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return jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(c.Endpoint)))
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case kindZipkin:
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return zipkin.New(c.Endpoint)
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case kindGrpc:
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return otlptracegrpc.NewUnstarted(
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otlptracegrpc.WithInsecure(),
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otlptracegrpc.WithEndpoint(c.Endpoint),
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otlptracegrpc.WithDialOption(grpc.WithBlock()),
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), nil
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default:
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return nil, fmt.Errorf("unknown exporter: %s", c.Batcher)
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}
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}
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func startAgent(c Config) error {
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opts := []sdktrace.TracerProviderOption{
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// Set the sampling rate based on the parent span to 100%
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sdktrace.WithSampler(sdktrace.ParentBased(sdktrace.TraceIDRatioBased(c.Sampler))),
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// Record information about this application in a Resource.
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sdktrace.WithResource(resource.NewSchemaless(semconv.ServiceNameKey.String(c.Name))),
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}
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if len(c.Endpoint) > 0 {
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exp, err := createExporter(c)
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if err != nil {
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logx.Error(err)
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return err
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}
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// Always be sure to batch in production.
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opts = append(opts, sdktrace.WithBatcher(exp))
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}
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tp = sdktrace.NewTracerProvider(opts...)
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otel.SetTracerProvider(tp)
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otel.SetErrorHandler(otel.ErrorHandlerFunc(func(err error) {
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logx.Errorf("[otel] error: %v", err)
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}))
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return nil
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}
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