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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"
)
var (
// Sinks :
Sinks = map[string]Sink{}
)
// Sink a kafka sink
type Sink struct {
producer kafka.SyncProducer
topic string
key string
}
func getSink(brokers []string, topic string, key string, config *kafka.Config) (Sink, error) {
producer, err := kafka.NewSyncProducer(brokers, config)
if err != nil {
dbg.Println("Cannot get sink %s", err)
return Sink{}, err
}
sink := Sink{
producer: producer,
topic: topic,
key: key,
}
return sink, nil
}
// InitSink initialize a kafka sink instance
func InitSink(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 := []string{u.Host}
config := kafka.NewConfig()
config.Producer.Return.Successes = true
dbg.Println("topic and key: %s %s", topic, key)
sink, err := getSink(brokers, topic, key, config)
return sink, err
}
// Write implements zap.Sink Write function
func (s Sink) Write(b []byte) (n int, err error) {
var errors Errors
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 {
errors = append(errors, err)
}
} else {
dbg.Println("Write:%s", topic)
_, _, err := s.producer.SendMessage(&kafka.ProducerMessage{
Topic: topic,
Value: kafka.ByteEncoder(b),
})
if err != nil {
errors = append(errors, err)
}
}
}
return len(b), errors
}
// Sync implement zap.Sink func Sync
func (s Sink) Sync() error {
return nil
}
// Close implements zap.Sink Close function
func (s Sink) Close() error {
return nil
}