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injector.go
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/
injector.go
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package amotel
import (
"context"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/trace"
"github.com/ibiscum/Event-Driven-Architecture-in-Golang/internal/am"
)
func OtelMessageContextInjector() am.MessagePublisherMiddleware {
return func(next am.MessagePublisher) am.MessagePublisher {
return am.MessagePublisherFunc(func(ctx context.Context, topicName string, msg am.Message) error {
var span trace.Span
ctx, span = tracer.Start(ctx,
msg.MessageName(),
trace.WithSpanKind(trace.SpanKindProducer),
trace.WithAttributes(
attribute.String("MessageID", msg.ID()),
attribute.String("Subject", msg.Subject()),
),
)
defer span.End()
propagator.Inject(ctx, MetadataCarrier(msg.Metadata()))
err := next.Publish(ctx, topicName, msg)
if err != nil {
span.RecordError(err)
span.SetStatus(codes.Error, err.Error())
}
return err
})
}
}