client,localclient: move localclient.go to client/local package

Updates tailscale/corp#22748

Signed-off-by: Percy Wegmann <percy@tailscale.com>

client/local/local_test.go

@@ -0,0 +1,74 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build go1.19
+
+package local
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"tailscale.com/tstest/deptest"
+	"tailscale.com/types/key"
+)
+
+func TestGetServeConfigFromJSON(t *testing.T) {
+	sc, err := getServeConfigFromJSON([]byte("null"))
+	if sc != nil {
+		t.Errorf("want nil for null")
+	}
+	if err != nil {
+		t.Errorf("reading null: %v", err)
+	}
+
+	sc, err = getServeConfigFromJSON([]byte(`{"TCP":{}}`))
+	if err != nil {
+		t.Errorf("reading object: %v", err)
+	} else if sc == nil {
+		t.Errorf("want non-nil for object")
+	} else if sc.TCP == nil {
+		t.Errorf("want non-nil TCP for object")
+	}
+}
+
+func TestWhoIsPeerNotFound(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(404)
+	}))
+	defer ts.Close()
+
+	lc := &Client{
+		Dial: func(ctx context.Context, network, addr string) (net.Conn, error) {
+			var std net.Dialer
+			return std.DialContext(ctx, network, ts.Listener.Addr().(*net.TCPAddr).String())
+		},
+	}
+	var k key.NodePublic
+	if err := k.UnmarshalText([]byte("nodekey:5c8f86d5fc70d924e55f02446165a5dae8f822994ad26bcf4b08fd841f9bf261")); err != nil {
+		t.Fatal(err)
+	}
+	res, err := lc.WhoIsNodeKey(context.Background(), k)
+	if err != ErrPeerNotFound {
+		t.Errorf("got (%v, %v), want ErrPeerNotFound", res, err)
+	}
+	res, err = lc.WhoIs(context.Background(), "1.2.3.4:5678")
+	if err != ErrPeerNotFound {
+		t.Errorf("got (%v, %v), want ErrPeerNotFound", res, err)
+	}
+}
+
+func TestDeps(t *testing.T) {
+	deptest.DepChecker{
+		BadDeps: map[string]string{
+			// Make sure we don't again accidentally bring in a dependency on
+			// drive or its transitive dependencies
+			"testing":                        "do not use testing package in production code",
+			"tailscale.com/drive/driveimpl":  "https://github.com/tailscale/tailscale/pull/10631",
+			"github.com/studio-b12/gowebdav": "https://github.com/tailscale/tailscale/pull/10631",
+		},
+	}.Check(t)
+}