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kafka.go
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kafka.go
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package kafka
import (
"fmt"
"log"
"net/url"
"strings"
"time"
kf "github.com/segmentio/kafka-go"
"github.com/segmentio/kafka-go/sasl/plain"
"github.com/telkomdev/tob/config"
"github.com/telkomdev/tob/util"
)
const (
// ErrorClosedNetwork is an error indicating the connection is closed
ErrorClosedNetwork = "use of closed network connection"
)
// Kafka service
type Kafka struct {
url string
brokerSize int
recovered bool
lastDownTime string
enabled bool
verbose bool
logger *log.Logger
client *kf.Conn
checkInterval int
stopChan chan bool
}
// NewKafka Kafka's constructor
func NewKafka(verbose bool, logger *log.Logger) *Kafka {
stopChan := make(chan bool, 1)
return &Kafka{
logger: logger,
verbose: verbose,
// by default service is recovered
recovered: true,
checkInterval: 0,
stopChan: stopChan,
}
}
// Name the name of the service
func (d *Kafka) Name() string {
return "kafka"
}
// Ping will try to ping the service
func (d *Kafka) Ping() []byte {
if d.client == nil {
return []byte("NOT_OK")
}
reply, err := d.client.Brokers()
if err != nil {
if d.verbose {
d.logger.Println("Kafka error read available brokers")
d.logger.Println(err)
}
// re dial
if strings.Contains(err.Error(), ErrorClosedNetwork) {
d.logger.Println(fmt.Sprintf("Kafka: %s | do re dial\n", err.Error()))
// re dial ignore error
err = d.dial()
if err != nil {
d.logger.Println(fmt.Sprintf("Kafka: %s | do re dial\n", err.Error()))
}
}
return []byte("NOT_OK")
}
if d.verbose {
d.logger.Print(fmt.Sprintf("Expected Kafka Brokers size: %d", d.brokerSize))
d.logger.Print("Kafka Brokers: ")
for _, broker := range reply {
d.logger.Println(broker.Host)
}
}
// if the reply length is less than brokerSize,
// then there is an indication that the Kafka Cluster is experiencing problems
if len(reply) < d.brokerSize {
return []byte("NOT_OK")
}
return []byte("OK")
}
// SetURL will set the service URL
func (d *Kafka) SetURL(url string) {
d.url = url
}
func (d *Kafka) dial() error {
if d.verbose {
d.logger.Println("connecting to Kafka server")
}
u, err := url.Parse(d.url)
if err != nil {
return err
}
hosts := u.Host
password := ""
username := ""
if u.User != nil {
if u.User.Username() != "" {
username = u.User.Username()
}
p, ok := u.User.Password()
if ok {
password = p
}
}
dialer := &kf.Dialer{
ClientID: "tob",
Timeout: 10 * time.Second,
DualStack: true,
}
if username != "" && password != "" {
dialer.SASLMechanism = plain.Mechanism{
Username: username,
Password: password,
}
}
hostSplitted := strings.Split(hosts, ",")
host := ""
if len(hostSplitted) > 1 {
host = hostSplitted[0]
} else {
host = hosts
}
// set brokerSize with total length of Kafka host broker from config
d.brokerSize = len(hostSplitted)
conn, err := dialer.Dial("tcp", host)
if err != nil {
return err
}
// set connected conn
d.client = conn
if d.verbose {
d.logger.Println("connecting to Kafka server succeed")
}
return nil
}
// Connect to service if needed
func (d *Kafka) Connect() error {
return d.dial()
}
// Close will close the service resources if needed
func (d *Kafka) Close() error {
if d.verbose {
d.logger.Println("closing Kafka connection")
}
if d.client != nil {
err := d.client.Close()
if err != nil {
return err
}
if d.verbose {
d.logger.Println("closing Kafka connection succeed")
}
}
return nil
}
// SetRecover will set recovered status
func (d *Kafka) SetRecover(recovered bool) {
d.recovered = recovered
}
// IsRecover will return recovered status
func (d *Kafka) IsRecover() bool {
return d.recovered
}
// LastDownTime will set last down time of service to current time
func (d *Kafka) SetLastDownTimeNow() {
if d.recovered {
d.lastDownTime = time.Now().Format(util.YYMMDD)
}
}
// GetDownTimeDiff will return down time service difference in minutes
func (d *Kafka) GetDownTimeDiff() string {
return util.TimeDifference(d.lastDownTime, time.Now().Format(util.YYMMDD))
}
// SetCheckInterval will set check interval to service
func (d *Kafka) SetCheckInterval(interval int) {
d.checkInterval = interval
}
// GetCheckInterval will return check interval to service
func (d *Kafka) GetCheckInterval() int {
return d.checkInterval
}
// Enable will set enabled status to service
func (d *Kafka) Enable(enabled bool) {
d.enabled = enabled
}
// IsEnabled will return enable status
func (d *Kafka) IsEnabled() bool {
return d.enabled
}
// SetMessage will set additional message
func (d *Kafka) SetMessage(message string) {
}
// GetMessage will return additional message
func (d *Kafka) GetMessage() string {
return ""
}
// SetConfig will set config
func (d *Kafka) SetConfig(configs config.Config) {
}
// Stop will receive stop channel
func (d *Kafka) Stop() chan bool {
return d.stopChan
}