86 lines
2.6 KiB
Go
86 lines
2.6 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package otelsarama // import "go.opentelemetry.io/contrib/instrumentation/github.com/Shopify/sarama/otelsarama"
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import (
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"context"
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"strconv"
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"github.com/Shopify/sarama"
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"go.opentelemetry.io/otel/attribute"
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semconv "go.opentelemetry.io/otel/semconv/v1.10.0"
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"go.opentelemetry.io/otel/trace"
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)
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type consumerMessagesDispatcher interface {
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Messages() <-chan *sarama.ConsumerMessage
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}
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type consumerMessagesDispatcherWrapper struct {
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d consumerMessagesDispatcher
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messages chan *sarama.ConsumerMessage
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cfg config
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}
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func newConsumerMessagesDispatcherWrapper(d consumerMessagesDispatcher, cfg config) *consumerMessagesDispatcherWrapper {
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return &consumerMessagesDispatcherWrapper{
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d: d,
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messages: make(chan *sarama.ConsumerMessage),
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cfg: cfg,
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}
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}
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// Messages returns the read channel for the messages that are returned by
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// the broker.
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func (w *consumerMessagesDispatcherWrapper) Messages() <-chan *sarama.ConsumerMessage {
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return w.messages
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}
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func (w *consumerMessagesDispatcherWrapper) Run() {
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msgs := w.d.Messages()
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for msg := range msgs {
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// Extract a span context from message to link.
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carrier := NewConsumerMessageCarrier(msg)
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parentSpanContext := w.cfg.Propagators.Extract(context.Background(), carrier)
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// Create a span.
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attrs := []attribute.KeyValue{
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semconv.MessagingSystemKey.String("kafka"),
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semconv.MessagingDestinationKindTopic,
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semconv.MessagingDestinationKey.String(msg.Topic),
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semconv.MessagingOperationReceive,
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semconv.MessagingMessageIDKey.String(strconv.FormatInt(msg.Offset, 10)),
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semconv.MessagingKafkaPartitionKey.Int64(int64(msg.Partition)),
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}
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opts := []trace.SpanStartOption{
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trace.WithAttributes(attrs...),
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trace.WithSpanKind(trace.SpanKindConsumer),
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}
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newCtx, span := w.cfg.Tracer.Start(parentSpanContext, "kafka.consume", opts...)
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// Inject current span context, so consumers can use it to propagate span.
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w.cfg.Propagators.Inject(newCtx, carrier)
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// Send messages back to user.
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w.messages <- msg
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span.End()
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}
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close(w.messages)
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}
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