/
writer.go
77 lines (64 loc) · 1.99 KB
/
writer.go
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package otelkafkakonsumer
import (
"context"
"fmt"
"strconv"
"github.com/segmentio/kafka-go"
"go.opentelemetry.io/otel/codes"
semconv "go.opentelemetry.io/otel/semconv/v1.16.0"
"go.opentelemetry.io/otel/trace"
)
type Writer struct {
W *kafka.Writer
TraceConfig *Config
}
// NewWriter wraps the resulting Writer with OpenTelemetry instrumentation
func NewWriter(w *kafka.Writer, opts ...Option) (*Writer, error) {
cfg := NewConfig(instrumentationName, opts...)
// Common attributes for all spans this producer will produce.
cfg.DefaultStartOpts = append(
cfg.DefaultStartOpts,
trace.WithAttributes(
semconv.MessagingDestinationKindTopic,
),
)
return &Writer{
W: w,
TraceConfig: cfg,
}, nil
}
func (w *Writer) Close() error {
return w.W.Close()
}
func (w *Writer) WriteMessage(ctx context.Context, msg kafka.Message) error {
span := w.startSpan(ctx, &msg)
err := w.W.WriteMessages(ctx, msg)
if err != nil {
span.RecordError(err)
span.SetStatus(codes.Error, err.Error())
}
span.End()
return err
}
// WriteMessages does not support tracing
// For details: https://github.com/Trendyol/otel-kafka-konsumer/issues/4
func (w *Writer) WriteMessages(ctx context.Context, msgs []kafka.Message) error {
return w.W.WriteMessages(ctx, msgs...)
}
func (w *Writer) startSpan(ctx context.Context, msg *kafka.Message) trace.Span {
carrier := NewMessageCarrier(msg)
psc := w.TraceConfig.Propagator.Extract(ctx, carrier)
opts := w.TraceConfig.MergedSpanStartOptions(
trace.WithAttributes(
semconv.MessagingDestinationKey.String(msg.Topic),
semconv.MessagingMessageIDKey.String(strconv.FormatInt(msg.Offset, 10)),
semconv.MessagingKafkaMessageKeyKey.String(string(msg.Key)),
semconv.MessagingKafkaPartitionKey.Int64(int64(msg.Partition)),
),
trace.WithSpanKind(trace.SpanKindProducer),
)
name := fmt.Sprintf("%s send", msg.Topic)
tracerCtx, span := w.TraceConfig.Tracer.Start(psc, name, opts...)
w.TraceConfig.Propagator.Inject(tracerCtx, carrier)
return span
}