remove global dnscache

remove global dnscache

main.go

@@ -81,10 +81,6 @@ const (
  profilingPath = "/.pprof"
 )
 
-var dnsCache = &dnscache.Resolver{
- Timeout: 5 * time.Second,
-}
-
 func init() {
  // Create a new instance of the logger. You can have any number of instances.
  log2 = logrus.New()
@@ -647,10 +643,11 @@ type roundTripperWrapper struct {
 }
 
 func (rtw *roundTripperWrapper) renew() {
- dnsCache.Refresh()
  tr := &http.Transport{
- Proxy: http.ProxyFromEnvironment,
- DialContext: dialContextWithDNSCache(dnsCache, newProxyDialContext(10*time.Second)),
+ Proxy: http.ProxyFromEnvironment,
+ DialContext: dialContextWithDNSCache(&dnscache.Resolver{
+ Timeout: 5 * time.Second,
+ }, newProxyDialContext(10*time.Second)),
  MaxIdleConnsPerHost: 1024,
  WriteBufferSize: 32 << 10, // 32KiB moving up from 4KiB default
  ReadBufferSize: 32 << 10, // 32KiB moving up from 4KiB default
@@ -929,15 +926,6 @@ func sidekickMain(ctx *cli.Context) {
  globalHostBalance = "least"
  }
 
- go func() {
- t := time.NewTicker(ctx.GlobalDuration("dns-ttl"))
- defer t.Stop()
-
- for range t.C {
- dnsCache.Refresh()
- }
- }()
-
  if !strings.HasPrefix(healthCheckPath, slashSeparator) {
  healthCheckPath = slashSeparator + healthCheckPath
  }