forked from asnowfox/vflow
/
kafka.go
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/
kafka.go
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//: ----------------------------------------------------------------------------
//: Copyright (C) 2017 Verizon. All Rights Reserved.
//: All Rights Reserved
//:
//: file: kafka.go
//: details: vflow kafka producer plugin
//: author: Mehrdad Arshad Rad
//: date: 02/01/2017
//:
//: 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 (
"crypto/tls"
"crypto/x509"
"io/ioutil"
"log"
"os"
"reflect"
"strconv"
"strings"
"time"
"github.com/Shopify/sarama"
"gopkg.in/yaml.v2"
)
// Kafka represents kafka producer
type Kafka struct {
producer sarama.AsyncProducer
config KafkaConfig
logger *log.Logger
}
// KafkaConfig represents kafka configuration
type KafkaConfig struct {
Brokers []string `yaml:"brokers" env:"BROKERS"`
Compression string `yaml:"compression" env:"COMPRESSION"`
RetryMax int `yaml:"retry-max" env:"RETRY_MAX"`
RequestSizeMax int32 `yaml:"request-size-max" env:"REQUEST_SIZE_MAX"`
RetryBackoff int `yaml:"retry-backoff" env:"RETRY_BACKOFF"`
TLSCertFile string `yaml:"tls-cert" env:"TLS_CERT"`
TLSKeyFile string `yaml:"tls-key" env:"TLS_KEY"`
CAFile string `yaml:"ca-file" env:"CA_FILE"`
VerifySSL bool `yaml:"verify-ssl" env:"VERIFY_SSL"`
}
func (k *Kafka) setup(configFile string, logger *log.Logger) error {
var (
config = sarama.NewConfig()
err error
)
// set default values
k.config = KafkaConfig{
Brokers: []string{"localhost:9092"},
RetryMax: 2,
RequestSizeMax: 104857600,
RetryBackoff: 10,
VerifySSL: true,
}
k.logger = logger
// load configuration if available
if err = k.load(configFile); err != nil {
logger.Println(err)
}
// init kafka configuration
config.ClientID = "vFlow.Kafka"
config.Producer.Retry.Max = k.config.RetryMax
config.Producer.Retry.Backoff = time.Duration(k.config.RetryBackoff) * time.Millisecond
sarama.MaxRequestSize = k.config.RequestSizeMax
switch k.config.Compression {
case "gzip":
config.Producer.Compression = sarama.CompressionGZIP
case "lz4":
config.Producer.Compression = sarama.CompressionLZ4
case "snappy":
config.Producer.Compression = sarama.CompressionSnappy
default:
config.Producer.Compression = sarama.CompressionNone
}
if tlsConfig := k.tlsConfig(); tlsConfig != nil {
config.Net.TLS.Config = tlsConfig
config.Net.TLS.Enable = true
k.logger.Println("Kafka client TLS enabled")
}
// get env config
k.loadEnv("VFLOW_KAFKA")
if err = config.Validate(); err != nil {
logger.Fatal(err)
}
k.producer, err = sarama.NewAsyncProducer(k.config.Brokers, config)
if err != nil {
return err
}
return nil
}
func (k *Kafka) inputMsg(topic string, mCh chan []byte, ec *uint64) {
var (
msg []byte
ok bool
)
k.logger.Printf("start producer: Kafka, brokers: %+v, topic: %s\n",
k.config.Brokers, topic)
for {
msg, ok = <-mCh
if !ok {
break
}
select {
case k.producer.Input() <- &sarama.ProducerMessage{
Topic: topic,
Value: sarama.ByteEncoder(msg),
}:
case err := <-k.producer.Errors():
k.logger.Println(err)
*ec++
}
}
k.producer.Close()
}
func (k *Kafka) load(f string) error {
b, err := ioutil.ReadFile(f)
if err != nil {
return err
}
err = yaml.Unmarshal(b, &k.config)
if err != nil {
return err
}
return nil
}
func (k Kafka) tlsConfig() *tls.Config {
var t *tls.Config
if k.config.TLSCertFile != "" && k.config.TLSKeyFile != "" && k.config.CAFile != "" {
cert, err := tls.LoadX509KeyPair(k.config.TLSCertFile, k.config.TLSKeyFile)
if err != nil {
k.logger.Fatal("Kafka TLS error: ", err)
}
caCert, err := ioutil.ReadFile(k.config.CAFile)
if err != nil {
k.logger.Fatal("Kafka TLS error: ", err)
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
t = &tls.Config{
Certificates: []tls.Certificate{cert},
RootCAs: caCertPool,
InsecureSkipVerify: k.config.VerifySSL,
}
}
return t
}
func (k *Kafka) loadEnv(prefix string) {
v := reflect.ValueOf(&k.config).Elem()
t := v.Type()
for i := 0; i < v.NumField(); i++ {
f := v.Field(i)
env := t.Field(i).Tag.Get("env")
if env == "" {
continue
}
val, ok := os.LookupEnv(prefix + "_" + env)
if !ok {
continue
}
switch f.Kind() {
case reflect.Int:
valInt, err := strconv.Atoi(val)
if err != nil {
k.logger.Println(err)
continue
}
f.SetInt(int64(valInt))
case reflect.String:
f.SetString(val)
case reflect.Slice:
for _, elm := range strings.Split(val, ";") {
f.Index(0).SetString(elm)
}
case reflect.Bool:
valBool, err := strconv.ParseBool(val)
if err != nil {
k.logger.Println(err)
continue
}
f.SetBool(valBool)
}
}
}