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package main
import (
"context"
"errors"
"go.opentelemetry.io/otel"
"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"
"go.opentelemetry.io/otel/sdk/resource"
"go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
)
func setupOpenTelemetry(ctx context.Context, serviceName, serviceVersion string) (func(context.Context) error, error) {
var shutdownFuncs []func(context.Context) error
shutdown := func(ctx context.Context) error {
var err error
for _, fn := range shutdownFuncs {
err = errors.Join(err, fn(ctx))
}
shutdownFuncs = nil
return err
}
res, err := resource.Merge(
resource.Default(),
resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceName(serviceName),
semconv.ServiceVersion(serviceVersion),
),
)
if err != nil {
return nil, errors.Join(err, shutdown(ctx))
}
prop := propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
)
otel.SetTextMapPropagator(prop)
tracerProvider, err := newTraceProvider(ctx, res)
if err != nil {
return nil, errors.Join(err, shutdown(ctx))
}
shutdownFuncs = append(shutdownFuncs, tracerProvider.Shutdown)
otel.SetTracerProvider(tracerProvider)
meterProvider, err := newMeterProvider(ctx, res)
if err != nil {
return nil, errors.Join(err, shutdown(ctx))
}
shutdownFuncs = append(shutdownFuncs, meterProvider.Shutdown)
otel.SetMeterProvider(meterProvider)
return shutdown, nil
}
func newTraceProvider(ctx context.Context, res *resource.Resource) (*trace.TracerProvider, error) {
traceExporter, err := otlptracegrpc.New(ctx)
if err != nil {
return nil, err
}
traceProvider := trace.NewTracerProvider(
trace.WithBatcher(traceExporter),
trace.WithResource(res),
)
return traceProvider, nil
}
func newMeterProvider(ctx context.Context, res *resource.Resource) (*metric.MeterProvider, error) {
metricExporter, err := otlpmetricgrpc.New(ctx)
if err != nil {
return nil, err
}
meterProvider := metric.NewMeterProvider(
metric.WithResource(res),
metric.WithReader(metric.NewPeriodicReader(metricExporter)),
)
return meterProvider, nil
}
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