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observability.go
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observability.go
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package observability
import (
"context"
"errors"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/propagation"
)
// setupOTelSDK bootstraps the OpenTelemetry pipeline.
// If it does not return an error, make sure to call shutdown for proper cleanup.
func SetupOTelSDK(ctx context.Context) (shutdown func(context.Context) error, err error) {
var shutdownFuncs []func(context.Context) error
// shutdown calls cleanup functions registered via shutdownFuncs.
// The errors from the calls are joined.
// Each registered cleanup will be invoked once.
shutdown = func(ctx context.Context) error {
var err error
for _, fn := range shutdownFuncs {
err = errors.Join(err, fn(ctx))
}
shutdownFuncs = nil
return err
}
// handleErr calls shutdown for cleanup and makes sure that all errors are returned.
handleErr := func(inErr error) {
err = errors.Join(inErr, shutdown(ctx))
}
// Set up propagator.
prop := newPropagator()
otel.SetTextMapPropagator(prop)
// Set up trace provider.
tracerProvider, err := newTraceProvider(ctx)
if err != nil {
handleErr(err)
return
}
shutdownFuncs = append(shutdownFuncs, tracerProvider.Shutdown)
otel.SetTracerProvider(tracerProvider)
// Set up meter provider.
meterProvider, err := newMeterProvider(ctx)
if err != nil {
handleErr(err)
return
}
shutdownFuncs = append(shutdownFuncs, meterProvider.Shutdown)
otel.SetMeterProvider(meterProvider)
return
}
func newPropagator() propagation.TextMapPropagator {
return propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
)
}