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producer.go
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producer.go
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/*
* Copyright 2019 InfAI (CC SES)
*
* 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 producer
import (
"github.com/SENERGY-Platform/device-repository/lib/config"
"github.com/SENERGY-Platform/device-repository/lib/source/util"
"github.com/segmentio/kafka-go"
"io"
"log"
"os"
"strings"
)
type Producer struct {
config config.Config
devices *kafka.Writer
hubs *kafka.Writer
aspects *kafka.Writer
done *kafka.Writer
}
func New(conf config.Config) (*Producer, error) {
devices, err := GetKafkaWriter(conf.KafkaUrl, conf.DeviceTopic, conf.Debug)
if err != nil {
return nil, err
}
aspects, err := GetKafkaWriter(conf.KafkaUrl, conf.AspectTopic, conf.Debug)
if err != nil {
return nil, err
}
hubs, err := GetKafkaWriter(conf.KafkaUrl, conf.HubTopic, conf.Debug)
if err != nil {
return nil, err
}
err = util.InitTopic(conf.KafkaUrl, conf.DoneTopic)
if err != nil {
return nil, err
}
done, err := GetKafkaWriter(conf.KafkaUrl, conf.DoneTopic, conf.Debug)
if err != nil {
return nil, err
}
return &Producer{config: conf, devices: devices, hubs: hubs, aspects: aspects, done: done}, nil
}
func GetKafkaWriter(broker string, topic string, debug bool) (writer *kafka.Writer, err error) {
var logger *log.Logger
if debug {
logger = log.New(os.Stdout, "[KAFKA-PRODUCER] ", 0)
} else {
logger = log.New(io.Discard, "", 0)
}
writer = &kafka.Writer{
Addr: kafka.TCP(broker),
Topic: topic,
MaxAttempts: 10,
Logger: logger,
BatchSize: 1,
Balancer: &KeySeparationBalancer{SubBalancer: &kafka.Hash{}, Seperator: "/"},
}
return writer, err
}
type KeySeparationBalancer struct {
SubBalancer kafka.Balancer
Seperator string
}
func (this *KeySeparationBalancer) Balance(msg kafka.Message, partitions ...int) (partition int) {
key := string(msg.Key)
if this.Seperator != "" {
keyParts := strings.Split(key, this.Seperator)
key = keyParts[0]
}
msg.Key = []byte(key)
return this.SubBalancer.Balance(msg, partitions...)
}