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kafka.go
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kafka.go
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// Copyright 2020-present Open Networking Foundation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package logging
import (
"net/url"
"strings"
kafka "github.com/Shopify/sarama"
"go.uber.org/zap"
)
func init() {
err := zap.RegisterSink("kafka", kafkaSinkFactory)
if err != nil {
panic(err)
}
}
// kafkaSink is a Kafka sink
type kafkaSink struct {
producer kafka.SyncProducer
topic string
key string
}
// kafkaSinkFactory is a factory for the Kafka sink
func kafkaSinkFactory(u *url.URL) (zap.Sink, error) {
topic := "kafka_default_topic"
key := "kafka_default_key"
m, _ := url.ParseQuery(u.RawQuery)
if len(m["topic"]) != 0 {
topic = m["topic"][0]
}
if len(m["key"]) != 0 {
key = m["key"][0]
}
brokers := strings.Split(u.Host, ",")
config := kafka.NewConfig()
config.Producer.Return.Successes = true
producer, err := kafka.NewSyncProducer(brokers, config)
if err != nil {
return kafkaSink{}, err
}
return kafkaSink{
producer: producer,
topic: topic,
key: key,
}, nil
}
// Write implements zap.Sink Write function
func (s kafkaSink) Write(b []byte) (int, error) {
var returnErr error
for _, topic := range strings.Split(s.topic, ",") {
if s.key != "" {
_, _, err := s.producer.SendMessage(&kafka.ProducerMessage{
Topic: topic,
Key: kafka.StringEncoder(s.key),
Value: kafka.ByteEncoder(b),
})
if err != nil {
returnErr = err
}
} else {
_, _, err := s.producer.SendMessage(&kafka.ProducerMessage{
Topic: topic,
Value: kafka.ByteEncoder(b),
})
if err != nil {
returnErr = err
}
}
}
return len(b), returnErr
}
// Sync implement zap.Sink func Sync
func (s kafkaSink) Sync() error {
return nil
}
// Close implements zap.Sink Close function
func (s kafkaSink) Close() error {
return nil
}