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tracer.go
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tracer.go
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package goopentelemetry
import (
"context"
"github.com/gin-gonic/gin"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/jaeger"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/sdk/resource"
tracesdk "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
"go.opentelemetry.io/otel/trace"
)
type (
OtelTracer interface {
SetTraceProviderJaeger() error
SetTraceProviderNewRelic(ctx context.Context) error
}
otelTracer struct {
env string
version string
service string
sampled bool
jaegerUrl string
exporterEndpoint *string
apiKey *string
}
)
func ConstructOtelTracer(options ...OtelTracerOptionFunc) OtelTracer {
otelTracerImplement := &otelTracer{
env: EnvironmentMode(),
version: AppVersion(),
service: AppName(),
sampled: OtelSampled(),
}
// Run the options on it
for _, option := range options {
option(otelTracerImplement)
}
return otelTracerImplement
}
func (ot *otelTracer) SetTraceProviderJaeger() error {
if ot.jaegerUrl == "" {
ot.jaegerUrl = OtelJaegerURL()
}
tp, err := ot.tracerProviderJaeger()
if err != nil {
return err
}
otel.SetTracerProvider(tp)
return nil
}
func (ot *otelTracer) SetTraceProviderNewRelic(context context.Context) error {
tracerProvider, err := ot.tracerProviderNewRelic(context)
if err != nil {
return err
}
otel.SetTracerProvider(tracerProvider)
return nil
}
// tracerProviderJaeger returns an OpenTelemetry TracerProvider configured to use
// the Jaeger exporter that will send spans to the provided url. The returned
// TracerProvider will also use a Resource configured with all the information
// about the application.
func (ot *otelTracer) tracerProviderJaeger() (*tracesdk.TracerProvider, error) {
// Create the Jaeger exporter
exporter, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(ot.jaegerUrl)))
if err != nil {
return nil, err
}
var sampler = tracesdk.NeverSample()
if ot.sampled {
sampler = tracesdk.AlwaysSample()
}
traceProvider := tracesdk.NewTracerProvider(
tracesdk.WithSampler(sampler),
// Always be sure to batch in production.
tracesdk.WithBatcher(exporter),
// Record information about this application in a Resource.
tracesdk.WithResource(resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String(ot.service),
semconv.ServiceVersionKey.String(ot.version),
attribute.String("environment", ot.env),
)),
)
return traceProvider, nil
}
// tracerProviderNewRelic returns an OpenTelemetry TracerProvider configured to use
// the NewRelic exporter that will send spans to the provided url. The returned
// TracerProvider will also use a Resource configured with all the information
// about the application.
func (ot *otelTracer) tracerProviderNewRelic(ctx context.Context) (*tracesdk.TracerProvider, error) {
// Create the NewRelic exporter
var options []otlptracegrpc.Option
if ot.exporterEndpoint != nil && ot.apiKey != nil {
options = append(options, otlptracegrpc.WithEndpoint(*ot.exporterEndpoint))
options = append(options, otlptracegrpc.WithHeaders(map[string]string{
"api-key": *ot.apiKey,
}))
}
exporter, err := otlptrace.New(ctx, otlptracegrpc.NewClient(options...))
if err != nil {
return nil, err
}
var sampler = tracesdk.NeverSample()
if ot.sampled {
sampler = tracesdk.AlwaysSample()
}
traceProvider := tracesdk.NewTracerProvider(
tracesdk.WithSampler(sampler),
// Always be sure to batch in production.
tracesdk.WithBatcher(exporter),
// Record information about this application in a Resource.
tracesdk.WithResource(resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String(ot.service),
semconv.ServiceVersionKey.String(ot.version),
attribute.String("environment", ot.env),
)),
)
return traceProvider, nil
}
func Start(ctx *gin.Context) (context.Context, trace.Span) {
actionName := GetActionName()
request := ctx.Request
requestMethod := request.Method
urlPath := ctx.Request.URL.Path
operation := WriteStringTemplate("[%s] %s %s", EnvironmentMode(), requestMethod, urlPath)
return NewSpan(ctx, actionName, operation)
}
func StartWorker(ctx context.Context) (context.Context, trace.Span) {
actionName := GetActionName()
operation := WriteStringTemplate("[%s] WORKER %s", EnvironmentMode(), GetFunctionName(2))
return NewSpan(ctx, actionName, operation)
}