go.opentelemetry.io/contrib/instrumentation/github.com/Shopify/sarama/otelsarama@v0.43.0/consumer_group.go (about)

     1  // Copyright The OpenTelemetry Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package otelsarama // import "go.opentelemetry.io/contrib/instrumentation/github.com/Shopify/sarama/otelsarama"
    16  
    17  import (
    18  	"github.com/Shopify/sarama"
    19  )
    20  
    21  type consumerGroupHandler struct {
    22  	sarama.ConsumerGroupHandler
    23  
    24  	cfg config
    25  }
    26  
    27  // ConsumeClaim wraps the session and claim to add instruments for messages.
    28  // It implements parts of `ConsumerGroupHandler`.
    29  func (h *consumerGroupHandler) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error {
    30  	// Wrap claim
    31  	dispatcher := newConsumerMessagesDispatcherWrapper(claim, h.cfg)
    32  	go dispatcher.Run()
    33  	claim = &consumerGroupClaim{
    34  		ConsumerGroupClaim: claim,
    35  		dispatcher:         dispatcher,
    36  	}
    37  
    38  	return h.ConsumerGroupHandler.ConsumeClaim(session, claim)
    39  }
    40  
    41  // WrapConsumerGroupHandler wraps a sarama.ConsumerGroupHandler causing each received
    42  // message to be traced.
    43  func WrapConsumerGroupHandler(handler sarama.ConsumerGroupHandler, opts ...Option) sarama.ConsumerGroupHandler {
    44  	cfg := newConfig(opts...)
    45  
    46  	return &consumerGroupHandler{
    47  		ConsumerGroupHandler: handler,
    48  		cfg:                  cfg,
    49  	}
    50  }
    51  
    52  type consumerGroupClaim struct {
    53  	sarama.ConsumerGroupClaim
    54  	dispatcher consumerMessagesDispatcher
    55  }
    56  
    57  func (c *consumerGroupClaim) Messages() <-chan *sarama.ConsumerMessage {
    58  	return c.dispatcher.Messages()
    59  }