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tracer.go
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tracer.go
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package otel
import (
"context"
"github.com/sabariramc/goserverbase/v5/instrumentation"
"github.com/sabariramc/goserverbase/v5/utils"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/metric"
sdkTrace "go.opentelemetry.io/otel/sdk/trace"
"go.opentelemetry.io/otel/trace"
)
type tracerManager struct {
*sdkTrace.TracerProvider
env string
version string
}
type tracer struct {
trace.Tracer
env string
version string
}
func (tm *tracerManager) Tracer(name string, opts ...trace.TracerOption) trace.Tracer {
tr := tm.TracerProvider.Tracer(name, opts...)
return &tracer{Tracer: tr, env: tm.env, version: tm.version}
}
func (t *tracer) Start(ctx context.Context, spanName string, opts ...trace.SpanStartOption) (context.Context, trace.Span) {
opts = append(opts, trace.WithAttributes(attribute.String("env", t.env), attribute.String("version", t.version)))
return t.Tracer.Start(ctx, spanName, opts...)
}
var global *tracerManager
func Init() (instrumentation.Tracer, error) {
if global != nil {
return global, nil
}
tp, err := newTraceProvider()
if err != nil {
return nil, err
}
global = &tracerManager{
TracerProvider: tp,
env: utils.GetEnv("OTEL_ENV", ""),
version: utils.GetEnv("OTEL_SERVICE_VERSION", ""),
}
meterProvider, err := newMeterProvider()
if err != nil {
return nil, err
}
otel.SetTracerProvider(global)
otel.SetTextMapPropagator(newPropagator())
otel.SetMeterProvider(meterProvider)
return global, nil
}
func ShutDown() {
if global == nil {
return
}
global.Shutdown(context.TODO())
}
func newPropagator() propagation.TextMapPropagator {
return propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
)
}
func newTraceProvider() (*sdkTrace.TracerProvider, error) {
exporter, err := otlptracegrpc.New(context.Background())
if err != nil {
return nil, err
}
bsp := sdkTrace.NewBatchSpanProcessor(exporter)
tp := sdkTrace.NewTracerProvider(
sdkTrace.WithSampler(sdkTrace.AlwaysSample()),
sdkTrace.WithBatcher(exporter),
sdkTrace.WithSpanProcessor(bsp),
)
return tp, nil
}
func newMeterProvider() (*metric.MeterProvider, error) {
metricExporter, err := otlpmetricgrpc.New(context.Background())
if err != nil {
return nil, err
}
meterProvider := metric.NewMeterProvider(metric.WithReader(metric.NewPeriodicReader(metricExporter)))
return meterProvider, nil
}