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producerImpl.go
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/
producerImpl.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package kafka
import (
"context"
"errors"
"github.com/Shopify/sarama"
"github.com/uber/cadence/.gen/go/indexer"
"github.com/uber/cadence/common/codec"
"github.com/uber/cadence/common/log"
"github.com/uber/cadence/common/log/tag"
"github.com/uber/cadence/common/messaging"
)
type (
producerImpl struct {
topic string
producer sarama.SyncProducer
msgEncoder codec.BinaryEncoder
logger log.Logger
}
)
var _ messaging.Producer = (*producerImpl)(nil)
// NewKafkaProducer is used to create the Kafka based producer implementation
func NewKafkaProducer(topic string, producer sarama.SyncProducer, logger log.Logger) messaging.Producer {
return &producerImpl{
topic: topic,
producer: producer,
msgEncoder: codec.NewThriftRWEncoder(),
logger: logger.WithTags(tag.KafkaTopicName(topic)),
}
}
// Publish is used to send messages to other clusters through Kafka topic
// TODO implement context when https://github.com/Shopify/sarama/issues/1849 is supported
func (p *producerImpl) Publish(_ context.Context, msg interface{}) error {
message, err := p.getProducerMessage(msg)
if err != nil {
return err
}
partition, offset, err := p.producer.SendMessage(message)
if err != nil {
p.logger.Warn("Failed to publish message to kafka",
tag.KafkaPartition(partition),
tag.KafkaPartitionKey(message.Key),
tag.KafkaOffset(offset),
tag.Error(err))
return p.convertErr(err)
}
return nil
}
// Close is used to close Kafka publisher
func (p *producerImpl) Close() error {
return p.convertErr(p.producer.Close())
}
func (p *producerImpl) serializeThrift(input codec.ThriftObject) ([]byte, error) {
payload, err := p.msgEncoder.Encode(input)
if err != nil {
p.logger.Error("Failed to serialize thrift object", tag.Error(err))
return nil, err
}
return payload, nil
}
func (p *producerImpl) getProducerMessage(message interface{}) (*sarama.ProducerMessage, error) {
switch message := message.(type) {
case *indexer.Message:
payload, err := p.serializeThrift(message)
if err != nil {
return nil, err
}
msg := &sarama.ProducerMessage{
Topic: p.topic,
Key: sarama.StringEncoder(message.GetWorkflowID()),
Value: sarama.ByteEncoder(payload),
}
return msg, nil
case *sarama.ConsumerMessage:
msg := &sarama.ProducerMessage{
Topic: p.topic,
Key: sarama.ByteEncoder(message.Key),
Value: sarama.ByteEncoder(message.Value),
}
return msg, nil
default:
return nil, errors.New("unknown producer message type")
}
}
func (p *producerImpl) convertErr(err error) error {
switch err {
case sarama.ErrMessageSizeTooLarge:
return messaging.ErrMessageSizeLimit
default:
return err
}
}