Direct proxy works

_config/global_ips.go

@@ -0,0 +1,52 @@
+package config
+
+import (
+	"context"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"strings"
+
+	"github.com/juju/errors"
+)
+
+const ifconfigAddress = "https://ifconfig.co/ip"
+
+func getGlobalIPv4() (net.IP, error) {
+	return fetchIP("tcp4")
+}
+
+func getGlobalIPv6() (net.IP, error) {
+	return fetchIP("tcp6")
+}
+
+func fetchIP(network string) (net.IP, error) {
+	dialer := &net.Dialer{FallbackDelay: -1}
+	client := &http.Client{
+		Jar: nil,
+		Transport: &http.Transport{
+			DialContext: func(ctx context.Context, _, addr string) (net.Conn, error) {
+				return dialer.DialContext(ctx, network, addr)
+			},
+		},
+	}
+
+	resp, err := client.Get(ifconfigAddress)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close() // nolint: errcheck
+
+	respDataBytes, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	respData := strings.TrimSpace(string(respDataBytes))
+
+	ip := net.ParseIP(respData)
+	if ip == nil {
+		return nil, errors.Errorf("ifconfig.co returns incorrect IP %s", respData)
+	}
+
+	return ip, nil
+}