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publisher.go
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publisher.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 publisher
import (
"context"
"github.com/SENERGY-Platform/device-manager/lib/config"
"github.com/SENERGY-Platform/device-manager/lib/kafka/util"
"github.com/segmentio/kafka-go"
"io"
"log"
"os"
"strings"
)
type Publisher struct {
config config.Config
devicetypes *kafka.Writer
devicegroups *kafka.Writer
protocols *kafka.Writer
devices *kafka.Writer
hubs *kafka.Writer
concepts *kafka.Writer
characteristics *kafka.Writer
aspects *kafka.Writer
functions *kafka.Writer
deviceclasses *kafka.Writer
locations *kafka.Writer
}
func New(conf config.Config, ctx context.Context) (*Publisher, error) {
log.Println("ensure kafka topics")
err := util.InitTopic(
conf.KafkaUrl,
conf.DeviceTypeTopic,
conf.DeviceGroupTopic,
conf.ProtocolTopic,
conf.DeviceTopic,
conf.HubTopic,
conf.ConceptTopic,
conf.CharacteristicTopic,
conf.AspectTopic,
conf.FunctionTopic,
conf.DeviceClassTopic,
conf.LocationTopic)
if err != nil {
return nil, err
}
log.Println("Produce to ", conf.DeviceTypeTopic, conf.ProtocolTopic, conf.DeviceTopic, conf.HubTopic, conf.ConceptTopic, conf.CharacteristicTopic, conf.LocationTopic)
devicetypes := getProducer(ctx, conf.KafkaUrl, conf.DeviceTypeTopic, conf.LogLevel == "DEBUG")
devicegroups := getProducer(ctx, conf.KafkaUrl, conf.DeviceGroupTopic, conf.LogLevel == "DEBUG")
devices := getProducer(ctx, conf.KafkaUrl, conf.DeviceTopic, conf.LogLevel == "DEBUG")
hubs := getProducer(ctx, conf.KafkaUrl, conf.HubTopic, conf.LogLevel == "DEBUG")
protocol := getProducer(ctx, conf.KafkaUrl, conf.ProtocolTopic, conf.LogLevel == "DEBUG")
concepts := getProducer(ctx, conf.KafkaUrl, conf.ConceptTopic, conf.LogLevel == "DEBUG")
characteristics := getProducer(ctx, conf.KafkaUrl, conf.CharacteristicTopic, conf.LogLevel == "DEBUG")
aspect := getProducer(ctx, conf.KafkaUrl, conf.AspectTopic, conf.LogLevel == "DEBUG")
function := getProducer(ctx, conf.KafkaUrl, conf.FunctionTopic, conf.LogLevel == "DEBUG")
deviceclass := getProducer(ctx, conf.KafkaUrl, conf.DeviceClassTopic, conf.LogLevel == "DEBUG")
location := getProducer(ctx, conf.KafkaUrl, conf.LocationTopic, conf.LogLevel == "DEBUG")
return &Publisher{
config: conf,
devicetypes: devicetypes,
devicegroups: devicegroups,
protocols: protocol,
devices: devices,
hubs: hubs,
concepts: concepts,
characteristics: characteristics,
aspects: aspect,
functions: function,
deviceclasses: deviceclass,
locations: location,
}, nil
}
func getProducer(ctx context.Context, broker string, topic string, debug bool) (writer *kafka.Writer) {
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: "/"},
}
go func() {
<-ctx.Done()
err := writer.Close()
if err != nil {
log.Println("ERROR: unable to close producer for", topic, err)
}
}()
return writer
}
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...)
}