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writer.go
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package otelkafkago
import (
"context"
"fmt"
"strconv"
"github.com/segmentio/kafka-go"
"go.opentelemetry.io/otel/codes"
semconv "go.opentelemetry.io/otel/semconv/v1.13.0"
"go.opentelemetry.io/otel/trace"
)
type Writer struct {
W *kafka.Writer
cfg *Config
}
// NewWriter wraps the resulting Writer with OpenTelemetry instrumentation
func NewWriter(w *kafka.Writer) (*Writer, error) {
return WrapWriter(w), nil
}
// WrapProducer wraps a kafka.Producer so that any produced events are traced.
func WrapWriter(w *kafka.Writer, opts ...Option) *Writer {
cfg := newConfig()
// Common attributes for all spans this producer will produce.
cfg.DefaultStartOpts = append(
cfg.DefaultStartOpts,
trace.WithAttributes(
semconv.MessagingDestinationKindTopic,
),
)
wrapped := &Writer{
W: w,
cfg: cfg,
}
return wrapped
}
func (w *Writer) startSpan(msg *kafka.Message) trace.Span {
carrier := NewMessageCarrier(msg)
psc := w.cfg.Propagator.Extract(context.Background(), carrier)
const base10 = 10
offset := strconv.FormatInt(int64(msg.Offset), base10)
opts := w.cfg.MergedSpanStartOptions(
trace.WithAttributes(
semconv.MessagingDestinationKey.String(msg.Topic),
semconv.MessagingMessageIDKey.String(offset),
semconv.MessagingKafkaMessageKeyKey.String(string(msg.Key)),
semconv.MessagingKafkaPartitionKey.Int64(int64(msg.Partition)),
),
trace.WithSpanKind(trace.SpanKindProducer),
)
name := fmt.Sprintf("%s send", msg.Topic)
ctx, span := w.cfg.Tracer.Start(psc, name, opts...)
w.cfg.Propagator.Inject(ctx, carrier)
return span
}
func (w *Writer) Close() {
w.W.Close()
}
func (w *Writer) WriteMessages(ctx context.Context, msg kafka.Message) error {
span := w.startSpan(&msg)
err := w.W.WriteMessages(ctx, msg)
if err != nil {
span.RecordError(err)
span.SetStatus(codes.Error, err.Error())
}
span.End()
return err
}