go.opentelemetry.io/contrib/instrumentation/github.com/Shopify/sarama/otelsarama@v0.43.0/consumer.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 partitionConsumer struct {
    22  	sarama.PartitionConsumer
    23  	dispatcher consumerMessagesDispatcher
    24  }
    25  
    26  // Messages returns the read channel for the messages that are returned by
    27  // the broker.
    28  func (pc *partitionConsumer) Messages() <-chan *sarama.ConsumerMessage {
    29  	return pc.dispatcher.Messages()
    30  }
    31  
    32  // WrapPartitionConsumer wraps a sarama.PartitionConsumer causing each received
    33  // message to be traced.
    34  func WrapPartitionConsumer(pc sarama.PartitionConsumer, opts ...Option) sarama.PartitionConsumer {
    35  	cfg := newConfig(opts...)
    36  
    37  	dispatcher := newConsumerMessagesDispatcherWrapper(pc, cfg)
    38  	go dispatcher.Run()
    39  	wrapped := &partitionConsumer{
    40  		PartitionConsumer: pc,
    41  		dispatcher:        dispatcher,
    42  	}
    43  	return wrapped
    44  }
    45  
    46  type consumer struct {
    47  	sarama.Consumer
    48  
    49  	opts []Option
    50  }
    51  
    52  // ConsumePartition invokes Consumer.ConsumePartition and wraps the resulting
    53  // PartitionConsumer.
    54  func (c *consumer) ConsumePartition(topic string, partition int32, offset int64) (sarama.PartitionConsumer, error) {
    55  	pc, err := c.Consumer.ConsumePartition(topic, partition, offset)
    56  	if err != nil {
    57  		return nil, err
    58  	}
    59  	return WrapPartitionConsumer(pc, c.opts...), nil
    60  }
    61  
    62  // WrapConsumer wraps a sarama.Consumer wrapping any PartitionConsumer created
    63  // via Consumer.ConsumePartition.
    64  func WrapConsumer(c sarama.Consumer, opts ...Option) sarama.Consumer {
    65  	return &consumer{
    66  		Consumer: c,
    67  		opts:     opts,
    68  	}
    69  }