// When using TCP, and the host resolves to multiple IP addresses,
// Dial will try each IP address in order until one succeeds.
//
// Examples:
//
//	Dial("tcp", "golang.org:http")
//	Dial("tcp", "192.0.2.1:http")
//	Dial("tcp", "198.51.100.1:80")
//	Dial("udp", "[2001:db8::1]:domain")
//	Dial("udp", "[fe80::1%lo0]:53")
//	Dial("tcp", ":80")
//
// For IP networks, the network must be "ip", "ip4" or "ip6" followed

	"crypto/tls"
	"fmt"
	"net"
	"net/http"
	"net/url"

	utilnet "k8s.io/apimachinery/pkg/util/net"
	"k8s.io/apimachinery/third_party/forked/golang/netutil"
	"k8s.io/klog/v2"
)

// DialURL will dial the specified URL using the underlying dialer held by the passed
// RoundTripper. The primary use of this method is to support proxying upgradable connections.

	// StageConnect indicates that the dial failed at establishing connection to the proxy server.
	StageConnect = "connect"
	// StageProxy indicates that the dial failed at requesting the proxy server to proxy.
	StageProxy = "proxy"
)

var (
	// Use buckets ranging from 5 ms to 12.5 seconds.
	latencyBuckets = []float64{0.005, 0.025, 0.1, 0.5, 2.5, 12.5}

	// Metrics provides access to all dial metrics.
	Metrics = newDialMetrics()
)

}

// wantDial waits for the Transport to start a Dial.
func (dt *transportDialTester) wantDial() *transportDialTesterConn {
	c := <-dt.dials
	c.connID = dt.dialCount
	dt.dialCount++
	dt.t.Logf("Dial %v: started", c.connID)
	return c
}

// finish completes a Dial.
func (c *transportDialTesterConn) finish(err error) {
	c.t.Logf("Dial %v: finished (err:%v)", c.connID, err)
	c.ready <- err

		},

		"insecure, custom dial": {
			TLSConfig: &tls.Config{InsecureSkipVerify: true},
			Dial:      d.DialContext,
		},
		"secure, no roots, custom dial": {
			TLSConfig:   &tls.Config{InsecureSkipVerify: false},
			Dial:        d.DialContext,
			ExpectError: "unknown authority|not trusted",
		},
		"secure with roots, custom dial": {
			TLSConfig: &tls.Config{InsecureSkipVerify: false, RootCAs: roots},

	// all 65535 valid (fake) ports. The listener is already using one, so
	// we should be able to Dial the remaining 65534.
	for len(dialed) < (1<<16)-2 {
		c, err := Dial(ln.Addr().Network(), ln.Addr().String())
		if err != nil {
			t.Fatalf("unexpected error from Dial with %v connections: %v", len(dialed), err)
		}
		dialed = append(dialed, c)
		if testing.Verbose() && len(dialed)%(1<<12) == 0 {

		}
	}
}

var dialGoogleTests = []struct {
	dial               func(string, string) (Conn, error)
	unreachableNetwork string
	networks           []string
	addrs              []string
}{
	{
		dial:     (&Dialer{DualStack: true}).Dial,
		networks: []string{"tcp", "tcp4", "tcp6"},
		addrs:    []string{"www.google.com:http"},
	},
	{
		dial:               Dial,
		unreachableNetwork: "tcp6",

)

var (
	// DefaultGRPCDialFunc just calls grpc.Dial directly, with no alterations to the arguments.
	DefaultGRPCDialFunc = grpc.DialContext
	// DefaultWebsocketDialFunc just calls dialer.Dial, with no alterations to the arguments.
	DefaultWebsocketDialFunc = func(dialer *websocket.Dialer, urlStr string, requestHeader http.Header) (*websocket.Conn, *http.Response, error) {
		return dialer.Dial(urlStr, requestHeader)
	}

	if err == nil {
		c.Close()
		t.Fatal("unexpected successful dial; want context canceled error")
	}

	select {
	case <-ctx.Done():
	case <-time.After(5 * time.Second):
		t.Fatal("expected context to be canceled")
	}

	oe, ok := err.(*OpError)
	if !ok || oe.Op != "dial" {
		t.Fatalf("Dial error = %#v; want dial *OpError", err)
	}

	if oe.Err != errCanceled {

// function. LookupHost may implement an internal DNS caching implementation, lookupHost
// input if nil then net.DefaultResolver.LookupHost is used.
//
// It dials one by one and returns first connected `net.Conn`.
// If it fails to dial all IPs from cache it returns first error. If no baseDialFunc
// is given, it sets default dial function.
//