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tracer.go
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tracer.go
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package observability
import (
"context"
"fmt"
"time"
"github.com/skkuding/codedang/iris/src/utils"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.7.0"
)
func InitTracer(ctx context.Context) func() {
ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
// Resource
res, err := newResource(ctx)
reportErr(err, "failed to create resource")
// Exporter
traceExporter, err := newExporter(ctx)
reportErr(err, "failed to create exporter")
// TraceProvider
batchSpanProcessor := sdktrace.NewBatchSpanProcessor(traceExporter)
tracerProvider := newTraceProvider(res, batchSpanProcessor)
otel.SetTracerProvider(tracerProvider)
return func() {
// Shutdown will flush any remaining spans and shut down the exporter.
reportErr(tracerProvider.Shutdown(ctx), "failed to shutdown TracerProvider")
cancel()
}
}
func newTraceProvider(res *resource.Resource, bsp sdktrace.SpanProcessor) *sdktrace.TracerProvider {
tracerProvider := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithResource(res),
sdktrace.WithSpanProcessor(bsp),
)
return tracerProvider
}
func newResource(ctx context.Context) (*resource.Resource, error) {
// Create a new resource with a service name and the service version.
r, err := resource.New(ctx,
resource.WithAttributes(
// the service name used to display traces in backends
semconv.ServiceNameKey.String("IRIS"),
),
)
if err != nil {
return nil, err
}
return r, nil
}
func newExporter(ctx context.Context) (*otlptrace.Exporter, error) {
oltpEndpoint := utils.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT_URL", "")
exp, err := otlptracehttp.New(ctx, otlptracehttp.WithEndpoint(oltpEndpoint), otlptracehttp.WithInsecure())
if err != nil {
return nil, err
}
return exp, nil
}
func reportErr(err error, message string) {
if err != nil {
// print error message
fmt.Print(message)
}
}