github.com/linapex/ethereum-go-chinese@v0.0.0-20190316121929-f8b7a73c3fa1/eth/protocol_test.go

//<developer>
//    <name>linapex 曹一峰</name>
//    <email>linapex@163.com</email>
//    <wx>superexc</wx>
//    <qqgroup>128148617</qqgroup>
//    <url>https://jsq.ink</url>
//    <role>pku engineer</role>
//    <date>2019-03-16 19:16:37</date>
//</624450089506574336>


package eth

import (
	"fmt"
	"sync"
	"testing"
	"time"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/eth/downloader"
	"github.com/ethereum/go-ethereum/p2p"
	"github.com/ethereum/go-ethereum/rlp"
)

func init() {
//log.root（）.sethandler（log.lvlfilterhandler（log.lvltrace，log.streamhandler（os.stderr，log.terminalformat（false）））
}

var testAccount, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")

//检测并正确报告握手失败的测试。
func TestStatusMsgErrors62(t *testing.T) { testStatusMsgErrors(t, 62) }
func TestStatusMsgErrors63(t *testing.T) { testStatusMsgErrors(t, 63) }

func testStatusMsgErrors(t *testing.T, protocol int) {
	pm, _ := newTestProtocolManagerMust(t, downloader.FullSync, 0, nil, nil)
	var (
		genesis = pm.blockchain.Genesis()
		head    = pm.blockchain.CurrentHeader()
		td      = pm.blockchain.GetTd(head.Hash(), head.Number.Uint64())
	)
	defer pm.Stop()

	tests := []struct {
		code      uint64
		data      interface{}
		wantError error
	}{
		{
			code: TxMsg, data: []interface{}{},
			wantError: errResp(ErrNoStatusMsg, "first msg has code 2 (!= 0)"),
		},
		{
			code: StatusMsg, data: statusData{10, DefaultConfig.NetworkId, td, head.Hash(), genesis.Hash()},
			wantError: errResp(ErrProtocolVersionMismatch, "10 (!= %d)", protocol),
		},
		{
			code: StatusMsg, data: statusData{uint32(protocol), 999, td, head.Hash(), genesis.Hash()},
			wantError: errResp(ErrNetworkIdMismatch, "999 (!= 1)"),
		},
		{
			code: StatusMsg, data: statusData{uint32(protocol), DefaultConfig.NetworkId, td, head.Hash(), common.Hash{3}},
			wantError: errResp(ErrGenesisBlockMismatch, "0300000000000000 (!= %x)", genesis.Hash().Bytes()[:8]),
		},
	}

	for i, test := range tests {
		p, errc := newTestPeer("peer", protocol, pm, false)
//在重置之前，发送呼叫可能挂起，因为
//协议可能无法读取有效负载。
		go p2p.Send(p.app, test.code, test.data)

		select {
		case err := <-errc:
			if err == nil {
				t.Errorf("test %d: protocol returned nil error, want %q", i, test.wantError)
			} else if err.Error() != test.wantError.Error() {
				t.Errorf("test %d: wrong error: got %q, want %q", i, err, test.wantError)
			}
		case <-time.After(2 * time.Second):
			t.Errorf("protocol did not shut down within 2 seconds")
		}
		p.close()
	}
}

//此测试检查接收到的事务是否添加到本地池。
func TestRecvTransactions62(t *testing.T) { testRecvTransactions(t, 62) }
func TestRecvTransactions63(t *testing.T) { testRecvTransactions(t, 63) }

func testRecvTransactions(t *testing.T, protocol int) {
	txAdded := make(chan []*types.Transaction)
	pm, _ := newTestProtocolManagerMust(t, downloader.FullSync, 0, nil, txAdded)
pm.acceptTxs = 1 //标记为同步以接受交易记录
	p, _ := newTestPeer("peer", protocol, pm, true)
	defer pm.Stop()
	defer p.close()

	tx := newTestTransaction(testAccount, 0, 0)
	if err := p2p.Send(p.app, TxMsg, []interface{}{tx}); err != nil {
		t.Fatalf("send error: %v", err)
	}
	select {
	case added := <-txAdded:
		if len(added) != 1 {
			t.Errorf("wrong number of added transactions: got %d, want 1", len(added))
		} else if added[0].Hash() != tx.Hash() {
			t.Errorf("added wrong tx hash: got %v, want %v", added[0].Hash(), tx.Hash())
		}
	case <-time.After(2 * time.Second):
		t.Errorf("no NewTxsEvent received within 2 seconds")
	}
}

//此测试检查是否发送挂起的事务。
func TestSendTransactions62(t *testing.T) { testSendTransactions(t, 62) }
func TestSendTransactions63(t *testing.T) { testSendTransactions(t, 63) }

func testSendTransactions(t *testing.T, protocol int) {
	pm, _ := newTestProtocolManagerMust(t, downloader.FullSync, 0, nil, nil)
	defer pm.Stop()

//把大交易填满池。
	const txsize = txsyncPackSize / 10
	alltxs := make([]*types.Transaction, 100)
	for nonce := range alltxs {
		alltxs[nonce] = newTestTransaction(testAccount, uint64(nonce), txsize)
	}
	pm.txpool.AddRemotes(alltxs)

//连接多个对等点。他们都应该收到待处理的事务。
	var wg sync.WaitGroup
	checktxs := func(p *testPeer) {
		defer wg.Done()
		defer p.close()
		seen := make(map[common.Hash]bool)
		for _, tx := range alltxs {
			seen[tx.Hash()] = false
		}
		for n := 0; n < len(alltxs) && !t.Failed(); {
			var txs []*types.Transaction
			msg, err := p.app.ReadMsg()
			if err != nil {
				t.Errorf("%v: read error: %v", p.Peer, err)
			} else if msg.Code != TxMsg {
				t.Errorf("%v: got code %d, want TxMsg", p.Peer, msg.Code)
			}
			if err := msg.Decode(&txs); err != nil {
				t.Errorf("%v: %v", p.Peer, err)
			}
			for _, tx := range txs {
				hash := tx.Hash()
				seentx, want := seen[hash]
				if seentx {
					t.Errorf("%v: got tx more than once: %x", p.Peer, hash)
				}
				if !want {
					t.Errorf("%v: got unexpected tx: %x", p.Peer, hash)
				}
				seen[hash] = true
				n++
			}
		}
	}
	for i := 0; i < 3; i++ {
		p, _ := newTestPeer(fmt.Sprintf("peer #%d", i), protocol, pm, true)
		wg.Add(1)
		go checktxs(p)
	}
	wg.Wait()
}

//测试自定义联合字段编码器和解码器是否正常工作。
func TestGetBlockHeadersDataEncodeDecode(t *testing.T) {
//为测试创建“随机”哈希
	var hash common.Hash
	for i := range hash {
		hash[i] = byte(i)
	}
//组装一些表驱动测试
	tests := []struct {
		packet *getBlockHeadersData
		fail   bool
	}{
//以哈希或数字的形式提供源站应该都有效
		{fail: false, packet: &getBlockHeadersData{Origin: hashOrNumber{Number: 314}}},
		{fail: false, packet: &getBlockHeadersData{Origin: hashOrNumber{Hash: hash}}},

//提供任意查询字段也应该有效
		{fail: false, packet: &getBlockHeadersData{Origin: hashOrNumber{Number: 314}, Amount: 314, Skip: 1, Reverse: true}},
		{fail: false, packet: &getBlockHeadersData{Origin: hashOrNumber{Hash: hash}, Amount: 314, Skip: 1, Reverse: true}},

//提供源哈希和源编号必须失败
		{fail: true, packet: &getBlockHeadersData{Origin: hashOrNumber{Hash: hash, Number: 314}}},
	}
//迭代每个测试，然后尝试编码然后解码
	for i, tt := range tests {
		bytes, err := rlp.EncodeToBytes(tt.packet)
		if err != nil && !tt.fail {
			t.Fatalf("test %d: failed to encode packet: %v", i, err)
		} else if err == nil && tt.fail {
			t.Fatalf("test %d: encode should have failed", i)
		}
		if !tt.fail {
			packet := new(getBlockHeadersData)
			if err := rlp.DecodeBytes(bytes, packet); err != nil {
				t.Fatalf("test %d: failed to decode packet: %v", i, err)
			}
			if packet.Origin.Hash != tt.packet.Origin.Hash || packet.Origin.Number != tt.packet.Origin.Number || packet.Amount != tt.packet.Amount ||
				packet.Skip != tt.packet.Skip || packet.Reverse != tt.packet.Reverse {
				t.Fatalf("test %d: encode decode mismatch: have %+v, want %+v", i, packet, tt.packet)
			}
		}
	}
}