github.com/yinchengtsinghua/golang-Eos-dpos-Ethereum@v0.0.0-20190121132951-92cc4225ed8e/p2p/discover/node_test.go

//此源码被清华学神尹成大魔王专业翻译分析并修改
//尹成QQ77025077
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//尹成所在QQ群721929980
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//https://mvp.microsoft.com/zh-cn/PublicProfile/4033620
//版权所有2015 Go Ethereum作者
//此文件是Go以太坊库的一部分。
//
//Go-Ethereum库是免费软件：您可以重新分发它和/或修改
//根据GNU发布的较低通用公共许可证的条款
//自由软件基金会，或者许可证的第3版，或者
//（由您选择）任何更高版本。
//
//Go以太坊图书馆的发行目的是希望它会有用，
//但没有任何保证；甚至没有
//适销性或特定用途的适用性。见
//GNU较低的通用公共许可证，了解更多详细信息。
//
//你应该收到一份GNU较低级别的公共许可证副本
//以及Go以太坊图书馆。如果没有，请参见<http://www.gnu.org/licenses/>。

package discover

import (
	"bytes"
	"fmt"
	"math/big"
	"math/rand"
	"net"
	"reflect"
	"strings"
	"testing"
	"testing/quick"
	"time"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/crypto"
)

func ExampleNewNode() {
	id := MustHexID("1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439")

//完整节点包含UDP和TCP终结点：
	n1 := NewNode(id, net.ParseIP("2001:db8:3c4d:15::abcd:ef12"), 52150, 30303)
	fmt.Println("n1:", n1)
	fmt.Println("n1.Incomplete() ->", n1.Incomplete())

//通过传递零值可以创建不完整的节点
//用于除ID以外的所有参数。
	n2 := NewNode(id, nil, 0, 0)
	fmt.Println("n2:", n2)
	fmt.Println("n2.Incomplete() ->", n2.Incomplete())

//输出：
//n1:enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6c1c64a5c8d659f51fcd512be2435232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@[2001:db8:3c4d:15:：abcd:ef12]：30303？磁盘端口＝52150
//n1.incomplete（）->错误
//n2:enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6c1c64a5c8d659f51fcd512be2435232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439
//n2.incomplete（）->真
}

var parseNodeTests = []struct {
	rawurl     string
	wantError  string
	wantResult *Node
}{
	{
rawurl:    "http://“福巴”
		wantError: `invalid URL scheme, want "enode"`,
	},
	{
rawurl:    "enode://01010101@123.124.125.126:3“，
		wantError: `invalid node ID (wrong length, want 128 hex chars)`,
	},
//使用IP地址完成节点。
	{
rawurl:    "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6c1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@hostname:3“，
		wantError: `invalid IP address`,
	},
	{
rawurl:    "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6c1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:foo“，
		wantError: `invalid port`,
	},
	{
rawurl:    "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6c1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:3？迪斯科=
		wantError: `invalid discport in query`,
	},
	{
rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6c1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:52150“，
		wantResult: NewNode(
			MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
			net.IP{0x7f, 0x0, 0x0, 0x1},
			52150,
			52150,
		),
	},
	{
rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6c1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@[：：]：52150“，
		wantResult: NewNode(
			MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
			net.ParseIP("::"),
			52150,
			52150,
		),
	},
	{
rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6c1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@[2001:db8:3c4d:15:：abcd:ef12]：52150“，
		wantResult: NewNode(
			MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
			net.ParseIP("2001:db8:3c4d:15::abcd:ef12"),
			52150,
			52150,
		),
	},
	{
rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6c1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:52150？discport=22334“，
		wantResult: NewNode(
			MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
			net.IP{0x7f, 0x0, 0x0, 0x1},
			22334,
			52150,
		),
	},
//没有地址的不完整节点。
	{
		rawurl: "1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439",
		wantResult: NewNode(
			MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
			nil, 0, 0,
		),
	},
	{
rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6c6c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439“，
		wantResult: NewNode(
			MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
			nil, 0, 0,
		),
	},
//无效网址
	{
		rawurl:    "01010101",
		wantError: `invalid node ID (wrong length, want 128 hex chars)`,
	},
	{
rawurl:    "enode://01010101“，
		wantError: `invalid node ID (wrong length, want 128 hex chars)`,
	},
	{
//此测试检查是否处理了URL.Parse中的错误。
rawurl:    "://“，”
wantError: `parse ://foo:缺少协议方案`，
	},
}

func TestParseNode(t *testing.T) {
	for _, test := range parseNodeTests {
		n, err := ParseNode(test.rawurl)
		if test.wantError != "" {
			if err == nil {
				t.Errorf("test %q:\n  got nil error, expected %#q", test.rawurl, test.wantError)
				continue
			} else if err.Error() != test.wantError {
				t.Errorf("test %q:\n  got error %#q, expected %#q", test.rawurl, err.Error(), test.wantError)
				continue
			}
		} else {
			if err != nil {
				t.Errorf("test %q:\n  unexpected error: %v", test.rawurl, err)
				continue
			}
			if !reflect.DeepEqual(n, test.wantResult) {
				t.Errorf("test %q:\n  result mismatch:\ngot:  %#v, want: %#v", test.rawurl, n, test.wantResult)
			}
		}
	}
}

func TestNodeString(t *testing.T) {
	for i, test := range parseNodeTests {
if test.wantError == "" && strings.HasPrefix(test.rawurl, "enode://“”{
			str := test.wantResult.String()
			if str != test.rawurl {
				t.Errorf("test %d: Node.String() mismatch:\ngot:  %s\nwant: %s", i, str, test.rawurl)
			}
		}
	}
}

func TestHexID(t *testing.T) {
	ref := NodeID{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 106, 217, 182, 31, 165, 174, 1, 67, 7, 235, 220, 150, 66, 83, 173, 205, 159, 44, 10, 57, 42, 161, 26, 188}
	id1 := MustHexID("0x000000000000000000000000000000000000000000000000000000000000000000000000000000806ad9b61fa5ae014307ebdc964253adcd9f2c0a392aa11abc")
	id2 := MustHexID("000000000000000000000000000000000000000000000000000000000000000000000000000000806ad9b61fa5ae014307ebdc964253adcd9f2c0a392aa11abc")

	if id1 != ref {
		t.Errorf("wrong id1\ngot  %v\nwant %v", id1[:], ref[:])
	}
	if id2 != ref {
		t.Errorf("wrong id2\ngot  %v\nwant %v", id2[:], ref[:])
	}
}

func TestNodeID_textEncoding(t *testing.T) {
	ref := NodeID{
		0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10,
		0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x20,
		0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x30,
		0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x40,
		0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x50,
		0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x60,
		0x61, 0x62, 0x63, 0x64,
	}
	hex := "01020304050607080910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364"

	text, err := ref.MarshalText()
	if err != nil {
		t.Fatal(err)
	}
	if !bytes.Equal(text, []byte(hex)) {
		t.Fatalf("text encoding did not match\nexpected: %s\ngot:      %s", hex, text)
	}

	id := new(NodeID)
	if err := id.UnmarshalText(text); err != nil {
		t.Fatal(err)
	}
	if *id != ref {
		t.Fatalf("text decoding did not match\nexpected: %s\ngot:      %s", ref, id)
	}
}

func TestNodeID_recover(t *testing.T) {
	prv := newkey()
	hash := make([]byte, 32)
	sig, err := crypto.Sign(hash, prv)
	if err != nil {
		t.Fatalf("signing error: %v", err)
	}

	pub := PubkeyID(&prv.PublicKey)
	recpub, err := recoverNodeID(hash, sig)
	if err != nil {
		t.Fatalf("recovery error: %v", err)
	}
	if pub != recpub {
		t.Errorf("recovered wrong pubkey:\ngot:  %v\nwant: %v", recpub, pub)
	}

	ecdsa, err := pub.Pubkey()
	if err != nil {
		t.Errorf("Pubkey error: %v", err)
	}
	if !reflect.DeepEqual(ecdsa, &prv.PublicKey) {
		t.Errorf("Pubkey mismatch:\n  got:  %#v\n  want: %#v", ecdsa, &prv.PublicKey)
	}
}

func TestNodeID_pubkeyBad(t *testing.T) {
	ecdsa, err := NodeID{}.Pubkey()
	if err == nil {
		t.Error("expected error for zero ID")
	}
	if ecdsa != nil {
		t.Error("expected nil result")
	}
}

func TestNodeID_distcmp(t *testing.T) {
	distcmpBig := func(target, a, b common.Hash) int {
		tbig := new(big.Int).SetBytes(target[:])
		abig := new(big.Int).SetBytes(a[:])
		bbig := new(big.Int).SetBytes(b[:])
		return new(big.Int).Xor(tbig, abig).Cmp(new(big.Int).Xor(tbig, bbig))
	}
	if err := quick.CheckEqual(distcmp, distcmpBig, quickcfg()); err != nil {
		t.Error(err)
	}
}

//随机测试很可能会错过它们相等的情况。
func TestNodeID_distcmpEqual(t *testing.T) {
	base := common.Hash{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
	x := common.Hash{15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0}
	if distcmp(base, x, x) != 0 {
		t.Errorf("distcmp(base, x, x) != 0")
	}
}

func TestNodeID_logdist(t *testing.T) {
	logdistBig := func(a, b common.Hash) int {
		abig, bbig := new(big.Int).SetBytes(a[:]), new(big.Int).SetBytes(b[:])
		return new(big.Int).Xor(abig, bbig).BitLen()
	}
	if err := quick.CheckEqual(logdist, logdistBig, quickcfg()); err != nil {
		t.Error(err)
	}
}

//随机测试很可能会错过它们相等的情况。
func TestNodeID_logdistEqual(t *testing.T) {
	x := common.Hash{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
	if logdist(x, x) != 0 {
		t.Errorf("logdist(x, x) != 0")
	}
}

func TestNodeID_hashAtDistance(t *testing.T) {
//我们不使用quick。请检查这里，因为它的输出不是
//当测试失败时非常有用。
	cfg := quickcfg()
	for i := 0; i < cfg.MaxCount; i++ {
		a := gen(common.Hash{}, cfg.Rand).(common.Hash)
		dist := cfg.Rand.Intn(len(common.Hash{}) * 8)
		result := hashAtDistance(a, dist)
		actualdist := logdist(result, a)

		if dist != actualdist {
			t.Log("a:     ", a)
			t.Log("result:", result)
			t.Fatalf("#%d: distance of result is %d, want %d", i, actualdist, dist)
		}
	}
}

func quickcfg() *quick.Config {
	return &quick.Config{
		MaxCount: 5000,
		Rand:     rand.New(rand.NewSource(time.Now().Unix())),
	}
}

//TODO:当我们需要go大于等于1.5时，可以删除generate方法。
//因为测试/快速学习在1.5中生成数组。

func (NodeID) Generate(rand *rand.Rand, size int) reflect.Value {
	var id NodeID
	m := rand.Intn(len(id))
	for i := len(id) - 1; i > m; i-- {
		id[i] = byte(rand.Uint32())
	}
	return reflect.ValueOf(id)
}