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/*
*
* Copyright 2019 Intel Corporation.
* 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 kafkawriter
import (
"gopkg.in/confluentinc/confluent-kafka-go.v1/kafka"
"strconv"
"sync"
)
//KWConfig - serialized type for config related to Kafka
type KWConfig struct {
//Broker - Kafka Bootstrap servers (comma separated)
Broker string `json:"bootstrap.servers"`
//Topic - kafka topic name
Topic string `json:"topic"`
//UsePartition - Enforce use of partitions
UsePartition bool `json:"usePartition"`
BatchMsgNum int `json:"batch.num.messages,omitempty"`
Compression string `json:"compression.codec,omitempty"`
}
//KWProducer - holds the Kafka Config and associated Kafka Producer
type KWProducer struct {
Config KWConfig
Producer *kafka.Producer
}
//KWRespMap packs the KWConfig and kwid for List Api
type KWRespMap map[string]KWConfig
//KWMap - Stores the Kafka Writer to Kafka Producer Mapping
// This is used to uniquely identify a Kafka Writer - Producer mapping.
var (
KWMap = make(map[string]KWProducer)
kwMutex sync.Mutex
id int
)
// NewKafkaWriter - creates a new producer using kafka config.
// Handles the remote write from prometheus and send to kafka topic
func NewKafkaWriter(kwc *KWConfig) (*kafka.Producer, error) {
producer, err := kafka.NewProducer(&kafka.ConfigMap{
"bootstrap.servers": kwc.Broker,
"compression.codec": kwc.Compression,
"batch.num.messages": kwc.BatchMsgNum,
"go.batch.producer": true,
"go.delivery.reports": false,
})
if err != nil {
return nil, err
}
return producer, nil
}
//NewKWConfig - creates a KWConfig object with default values
func NewKWConfig() *KWConfig {
return &KWConfig{
UsePartition: false,
BatchMsgNum: 10000,
Compression: "none",
}
}
//NewKWRespMap - packs the KWConfig and kwid for List Api
func newKWRespMap() KWRespMap {
kwr := make(KWRespMap)
return kwr
}
//AddKWC - Method to add KafkaWriterConfig request to KWMap
func AddKWC(kwc *KWConfig) (string, error) {
kwMutex.Lock()
defer kwMutex.Unlock()
//TODO: Generate kwid
kwid := "pkw" + strconv.Itoa(id)
id++
producer, err := NewKafkaWriter(kwc)
if err != nil {
log.Error("Error", err)
id--
return "", err
}
KWMap[kwid] = KWProducer{
Config: *kwc,
Producer: producer,
}
return kwid, nil
}
//DeleteKWC - Method to add KafkaWriter request to KWMap
func DeleteKWC(kwid string) {
kwMutex.Lock()
defer kwMutex.Unlock()
if _, ok := KWMap[kwid]; ok {
KWMap[kwid].Producer.Close()
}
delete(KWMap, kwid)
}
//ListKWC - Method to add KafkaWriter request to KWMap
func ListKWC() KWRespMap {
kwr := newKWRespMap()
for k, v := range KWMap {
kwr[k] = v.Config
}
return kwr
}
//Cleanup - Method to cleanup resources
func Cleanup() {
for k := range KWMap {
DeleteKWC(k)
}
}
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