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naming.go
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/
naming.go
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package redis
import (
"github.com/kenkinsai/denny/naming"
"time"
)
func (r *redis) Register(addr string, ttl int) error {
var (
ticker = time.NewTicker(time.Second * time.Duration(ttl))
err error
svcPath = "/" + naming.Prefix + "/" + r.serviceName + "/" + addr
)
r.Infof("register %s with registy", svcPath)
err = r.register(addr, ttl)
if err != nil {
r.Errorf("error %v", err)
return err
}
go func() {
for {
select {
case _ = <-ticker.C:
_ = r.register(addr, ttl)
case _ = <-r.shutdown:
// receive message from shutdown channel
// will stop current thread and stop ticker to prevent thread leak
ticker.Stop()
return
}
}
}()
return nil
}
func (r *redis) register(addr string, ttl int) error {
var (
svcPath = "/" + naming.Prefix + "/" + r.serviceName + "/" + addr
)
existCmd := r.cli.Exists(svcPath)
val, err := existCmd.Result()
if err != nil {
return err
}
if val != 0 {
// increase expired time
touchCmd := r.cli.Expire(svcPath, time.Duration(ttl*2)*time.Second)
return touchCmd.Err()
}
setCmd := r.cli.Set(svcPath, addr, time.Duration(ttl*2)*time.Second)
return setCmd.Err()
}
func (r *redis) UnRegister(addr string) error {
var (
svcPath = "/" + naming.Prefix + "/" + r.serviceName + "/" + addr
)
r.shutdown <- "stop"
return r.cli.Del(svcPath).Err()
}