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proxy.go
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proxy.go
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package geo
import (
"github.com/jitsucom/jitsu/server/logging"
"github.com/jitsucom/jitsu/server/safego"
"sync"
"time"
)
//UpdatableProxy creates Resolver and re-create it every 24 hours with retry (if create fails e.g. because of connection issue)
type UpdatableProxy struct {
factoryMethod func(path string) (Resolver, error)
maxmindLink string
mutex *sync.RWMutex
resolver Resolver
closed chan struct{}
}
//newResolverProxy creates Resolver immediately and starts goroutine for re-create Resolver
func newResolverProxy(maxmindLink string, factoryMethod func(path string) (Resolver, error)) (Resolver, error) {
underlyingResolver, err := factoryMethod(maxmindLink)
if err != nil {
return nil, err
}
up := &UpdatableProxy{
factoryMethod: factoryMethod,
maxmindLink: maxmindLink,
mutex: &sync.RWMutex{},
resolver: underlyingResolver,
closed: make(chan struct{}),
}
up.start()
return up, nil
}
func (up *UpdatableProxy) start() {
safego.RunWithRestart(func() {
ticker := time.NewTicker(24 * time.Hour)
for {
select {
case <-up.closed:
return
case <-ticker.C:
logging.Info("running geo resolver databases update..")
resolver, err := up.factoryMethod(up.maxmindLink)
if err != nil {
logging.SystemErrorf("Error reloading geo resolver [%s]: %v", up.maxmindLink, err)
continue
}
up.mutex.Lock()
up.resolver = resolver
up.mutex.Unlock()
}
}
}).WithRestartTimeout(1 * time.Minute)
}
func (up *UpdatableProxy) Resolve(ip string) (*Data, error) {
up.mutex.RLock()
defer up.mutex.RUnlock()
return up.resolver.Resolve(ip)
}
func (up *UpdatableProxy) Type() string {
up.mutex.RLock()
defer up.mutex.RUnlock()
return up.resolver.Type()
}
func (up *UpdatableProxy) Close() error {
up.mutex.RLock()
defer up.mutex.RUnlock()
select {
case <-up.closed:
return nil
default:
close(up.closed)
return up.resolver.Close()
}
}