TUN-3494: Proceed to create tunnel if at least one edge address can be resolved

edgediscovery/allregions/discovery.go

@@ -121,15 +121,15 @@ func resolveSRVToTCP(srv *net.SRV) ([]*net.TCPAddr, error) {
 }
 
 // ResolveAddrs resolves TCP address given a list of addresses. Address can be a hostname, however, it will return at most one
-// of the hostname's IP addresses
-func ResolveAddrs(addrs []string) ([]*net.TCPAddr, error) {
-	var tcpAddrs []*net.TCPAddr
+// of the hostname's IP addresses.
+func ResolveAddrs(addrs []string, logger logger.Service) (resolved []*net.TCPAddr) {
 	for _, addr := range addrs {
 		tcpAddr, err := net.ResolveTCPAddr("tcp", addr)
 		if err != nil {
-			return nil, err
+			logger.Errorf("Failed to resolve %s, err: %v", addr, err)
+		} else {
+			resolved = append(resolved, tcpAddr)
 		}
-		tcpAddrs = append(tcpAddrs, tcpAddr)
 	}
-	return tcpAddrs, nil
+	return
 }

edgediscovery/allregions/regions.go

@@ -35,12 +35,12 @@ func ResolveEdge(logger logger.Service) (*Regions, error) {
 
 // StaticEdge creates a list of edge addresses from the list of hostnames.
 // Mainly used for testing connectivity.
-func StaticEdge(hostnames []string) (*Regions, error) {
-	addrs, err := ResolveAddrs(hostnames)
-	if err != nil {
-		return nil, err
+func StaticEdge(hostnames []string, logger logger.Service) (*Regions, error) {
+	resolved := ResolveAddrs(hostnames, logger)
+	if len(resolved) == 0 {
+		return nil, fmt.Errorf("failed to resolve any edge address")
 	}
-	return NewNoResolve(addrs), nil
+	return NewNoResolve(resolved), nil
 }
 
 // NewNoResolve doesn't resolve the edge. Instead it just uses the given addresses.

edgediscovery/edgediscovery.go

@@ -41,7 +41,7 @@ func ResolveEdge(l logger.Service) (*Edge, error) {
 
 // StaticEdge creates a list of edge addresses from the list of hostnames. Mainly used for testing connectivity.
 func StaticEdge(l logger.Service, hostnames []string) (*Edge, error) {
-	regions, err := allregions.StaticEdge(hostnames)
+	regions, err := allregions.StaticEdge(hostnames, l)
 	if err != nil {
 		return new(Edge), err
 	}