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| 1 | +package xtrace |
| 2 | + |
| 3 | +import ( |
| 4 | + "errors" |
| 5 | + "fmt" |
| 6 | + "github.com/yunqi/lighthouse/config" |
| 7 | + "github.com/yunqi/lighthouse/internal/xlog" |
| 8 | + "go.opentelemetry.io/otel" |
| 9 | + "go.opentelemetry.io/otel/exporters/jaeger" |
| 10 | + "go.opentelemetry.io/otel/exporters/zipkin" |
| 11 | + "go.opentelemetry.io/otel/propagation" |
| 12 | + "go.opentelemetry.io/otel/sdk/resource" |
| 13 | + sdktrace "go.opentelemetry.io/otel/sdk/trace" |
| 14 | + semconv "go.opentelemetry.io/otel/semconv/v1.7.0" |
| 15 | + "go.uber.org/zap" |
| 16 | + "sync" |
| 17 | +) |
| 18 | + |
| 19 | +const Name = "lighthouse" |
| 20 | + |
| 21 | +const ( |
| 22 | + Jaeger = "jaeger" |
| 23 | + Zipkin = "zipkin" |
| 24 | +) |
| 25 | + |
| 26 | +var ( |
| 27 | + ErrUnknownExporter = errors.New("unknown exporter error") |
| 28 | +) |
| 29 | + |
| 30 | +var ( |
| 31 | + agents = make(map[string]struct{}) |
| 32 | + lock sync.Mutex |
| 33 | +) |
| 34 | + |
| 35 | +// StartAgent starts a opentelemetry agent. |
| 36 | +func StartAgent(c *config.Trace) { |
| 37 | + lock.Lock() |
| 38 | + defer lock.Unlock() |
| 39 | + |
| 40 | + _, ok := agents[c.Endpoint] |
| 41 | + if ok { |
| 42 | + return |
| 43 | + } |
| 44 | + |
| 45 | + // if error happens, let later calls run. |
| 46 | + if err := startAgent(c); err != nil { |
| 47 | + return |
| 48 | + } |
| 49 | + |
| 50 | + agents[c.Endpoint] = struct{}{} |
| 51 | +} |
| 52 | +func startAgent(c *config.Trace) error { |
| 53 | + opts := []sdktrace.TracerProviderOption{ |
| 54 | + // Set the sampling rate based on the parent span to 100% |
| 55 | + sdktrace.WithSampler(sdktrace.ParentBased(sdktrace.TraceIDRatioBased(c.Sampler))), |
| 56 | + // Record information about this application in a Resource. |
| 57 | + sdktrace.WithResource(resource.NewSchemaless(semconv.ServiceNameKey.String(c.Name))), |
| 58 | + } |
| 59 | + |
| 60 | + if len(c.Endpoint) > 0 { |
| 61 | + exp, err := createExporter(c) |
| 62 | + if err != nil { |
| 63 | + xlog.Panic("opentelemetry exporter err", zap.Error(err)) |
| 64 | + return err |
| 65 | + } |
| 66 | + |
| 67 | + // Always be sure to batch in production. |
| 68 | + opts = append(opts, sdktrace.WithBatcher(exp)) |
| 69 | + } |
| 70 | + |
| 71 | + tp := sdktrace.NewTracerProvider(opts...) |
| 72 | + otel.SetTracerProvider(tp) |
| 73 | + |
| 74 | + otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator( |
| 75 | + propagation.TraceContext{}, propagation.Baggage{})) |
| 76 | + |
| 77 | + otel.SetErrorHandler(otel.ErrorHandlerFunc(func(err error) { |
| 78 | + xlog.Error("[opentelemetry] error", zap.Error(err)) |
| 79 | + })) |
| 80 | + |
| 81 | + return nil |
| 82 | +} |
| 83 | +func createExporter(c *config.Trace) (sdktrace.SpanExporter, error) { |
| 84 | + // Just support jaeger and zipkin now, more for later |
| 85 | + switch c.Batcher { |
| 86 | + case Jaeger: |
| 87 | + return jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(c.Endpoint))) |
| 88 | + case Zipkin: |
| 89 | + return zipkin.New(c.Endpoint) |
| 90 | + default: |
| 91 | + return nil, fmt.Errorf("%w: %s", ErrUnknownExporter, c.Batcher) |
| 92 | + } |
| 93 | +} |
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