[agent] splitting the agent into separate repositories

pkg/utils/http.go

@@ -1,92 +0,0 @@
-package utils
-
-import (
-	"context"
-	"errors"
-	"net"
-	"net/http"
-	"strings"
-	"time"
-)
-
-func NewSingleStackHTTPClient(httpTimeout, dialTimeout, keepAliveTimeout time.Duration, ipv6 bool) *http.Client {
-	dialer := &net.Dialer{
-		Timeout:   dialTimeout,
-		KeepAlive: keepAliveTimeout,
-	}
-
-	transport := &http.Transport{
-		Proxy:             http.ProxyFromEnvironment,
-		ForceAttemptHTTP2: false,
-		DialContext: func(ctx context.Context, network string, addr string) (net.Conn, error) {
-			ip, err := resolveIP(addr, ipv6)
-			if err != nil {
-				return nil, err
-			}
-			return dialer.DialContext(ctx, network, ip)
-		},
-	}
-
-	return &http.Client{
-		Transport: transport,
-		Timeout:   httpTimeout,
-	}
-}
-
-func resolveIP(addr string, ipv6 bool) (string, error) {
-	url := strings.Split(addr, ":")
-
-	dnsServers := []string{"[2606:4700:4700::1001]", "[2001:4860:4860::8844]", "[2400:3200::1]", "[2400:3200:baba::1]"}
-	if !ipv6 {
-		dnsServers = []string{"1.0.0.1", "8.8.4.4", "223.5.5.5", "223.6.6.6"}
-	}
-
-	res, err := net.LookupIP(url[0])
-	if err != nil {
-		for i := 0; i < len(dnsServers); i++ {
-			r := &net.Resolver{
-				PreferGo: true,
-				Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
-					d := net.Dialer{
-						Timeout: time.Second * 10,
-					}
-					return d.DialContext(ctx, "udp", dnsServers[i]+":53")
-				},
-			}
-			res, err = r.LookupIP(context.Background(), "ip", url[0])
-			if err == nil {
-				break
-			}
-		}
-	}
-
-	if err != nil {
-		return "", err
-	}
-
-	var ipv4Resolved, ipv6Resolved bool
-
-	for i := 0; i < len(res); i++ {
-		ip := res[i].String()
-		if strings.Contains(ip, ".") && !ipv6 {
-			ipv4Resolved = true
-			url[0] = ip
-			break
-		}
-		if strings.Contains(ip, ":") && ipv6 {
-			ipv6Resolved = true
-			url[0] = "[" + ip + "]"
-			break
-		}
-	}
-
-	if ipv6 && !ipv6Resolved {
-		return "", errors.New("the AAAA record not resolved")
-	}
-
-	if !ipv6 && !ipv4Resolved {
-		return "", errors.New("the A record not resolved")
-	}
-
-	return strings.Join(url, ":"), nil
-}