feat: increase delay time for certificates refresh

This increases the delay in refreshing certificates if the first start
was successful. This is necessary to save battery power when the network
connection is unavailable.

dnscrypt-proxy/config.go

@@ -447,7 +447,8 @@ func ConfigLoad(proxy *Proxy, flags *ConfigFlags) error {
 	}
 	proxy.certRefreshConcurrency = Max(1, config.CertRefreshConcurrency)
 	proxy.certRefreshDelay = time.Duration(Max(60, config.CertRefreshDelay)) * time.Minute
-	proxy.certRefreshDelayAfterFailure = time.Duration(10 * time.Second)
+	proxy.certRefreshDelayStartFailure = time.Duration(10 * time.Second)
+	proxy.certRefreshDelayAfterFailure = time.Duration(30 * time.Minute)
 	proxy.certIgnoreTimestamp = config.CertIgnoreTimestamp
 	proxy.ephemeralKeys = config.EphemeralKeys
 	if len(config.ListenAddresses) == 0 && len(config.LocalDoH.ListenAddresses) == 0 {

dnscrypt-proxy/proxy.go

@@ -71,6 +71,7 @@ type Proxy struct {
 	ServerNames                   []string
 	DisabledServerNames           []string
 	requiredProps                 stamps.ServerInformalProperties
+	certRefreshDelayStartFailure  time.Duration
 	certRefreshDelayAfterFailure  time.Duration
 	timeout                       time.Duration
 	certRefreshDelay              time.Duration
@@ -252,9 +253,12 @@ func (proxy *Proxy) StartProxy() {
 	if proxy.showCerts {
 		os.Exit(0)
 	}
+	startSuccesfull := false
 	if liveServers > 0 {
+		startSuccesfull = true
 		dlog.Noticef("dnscrypt-proxy is ready - live servers: %d", liveServers)
 	} else if err != nil {
+		startSuccesfull = false
 		dlog.Error(err)
 		dlog.Notice("dnscrypt-proxy is waiting for at least one server to be reachable")
 	}
@@ -269,12 +273,15 @@ func (proxy *Proxy) StartProxy() {
 		go func() {
 			for {
 				delay := proxy.certRefreshDelay
-				if liveServers == 0 {
+				if liveServers == 0 && startSuccesfull {
 					delay = proxy.certRefreshDelayAfterFailure
+				} else if liveServers == 0 {
+					delay = proxy.certRefreshDelayStartFailure
 				}
 				clocksmith.Sleep(delay)
 				liveServers, _ = proxy.serversInfo.refresh(proxy)
 				if liveServers > 0 {
+					startSuccesfull = true
 					proxy.certIgnoreTimestamp = false
 				}
 				runtime.GC()