github.com/linapex/ethereum-go-chinese@v0.0.0-20190316121929-f8b7a73c3fa1/core/chain_makers_test.go (about)

     1  
     2  //<developer>
     3  //    <name>linapex 曹一峰</name>
     4  //    <email>linapex@163.com</email>
     5  //    <wx>superexc</wx>
     6  //    <qqgroup>128148617</qqgroup>
     7  //    <url>https://jsq.ink</url>
     8  //    <role>pku engineer</role>
     9  //    <date>2019-03-16 19:16:35</date>
    10  //</624450078563635200>
    11  
    12  
    13  package core
    14  
    15  import (
    16  	"fmt"
    17  	"math/big"
    18  
    19  	"github.com/ethereum/go-ethereum/consensus/ethash"
    20  	"github.com/ethereum/go-ethereum/core/types"
    21  	"github.com/ethereum/go-ethereum/core/vm"
    22  	"github.com/ethereum/go-ethereum/crypto"
    23  	"github.com/ethereum/go-ethereum/ethdb"
    24  	"github.com/ethereum/go-ethereum/params"
    25  )
    26  
    27  func ExampleGenerateChain() {
    28  	var (
    29  		key1, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
    30  		key2, _ = crypto.HexToECDSA("8a1f9a8f95be41cd7ccb6168179afb4504aefe388d1e14474d32c45c72ce7b7a")
    31  		key3, _ = crypto.HexToECDSA("49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee")
    32  		addr1   = crypto.PubkeyToAddress(key1.PublicKey)
    33  		addr2   = crypto.PubkeyToAddress(key2.PublicKey)
    34  		addr3   = crypto.PubkeyToAddress(key3.PublicKey)
    35  		db      = ethdb.NewMemDatabase()
    36  	)
    37  
    38  //确保key1在Genesis区块有一些资金。
    39  	gspec := &Genesis{
    40  		Config: &params.ChainConfig{HomesteadBlock: new(big.Int)},
    41  		Alloc:  GenesisAlloc{addr1: {Balance: big.NewInt(1000000)}},
    42  	}
    43  	genesis := gspec.MustCommit(db)
    44  
    45  //此调用生成5个块的链。函数运行的目的是
    46  //每个块，并根据
    47  //块索引。
    48  	signer := types.HomesteadSigner{}
    49  	chain, _ := GenerateChain(gspec.Config, genesis, ethash.NewFaker(), db, 5, func(i int, gen *BlockGen) {
    50  		switch i {
    51  		case 0:
    52  //在块1中，addr1发送addr2一些乙醚。
    53  			tx, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr1), addr2, big.NewInt(10000), params.TxGas, nil, nil), signer, key1)
    54  			gen.AddTx(tx)
    55  		case 1:
    56  //在块2中，addr1向addr2发送更多的乙醚。
    57  //addr2将其传递给addr3。
    58  			tx1, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr1), addr2, big.NewInt(1000), params.TxGas, nil, nil), signer, key1)
    59  			tx2, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr2), addr3, big.NewInt(1000), params.TxGas, nil, nil), signer, key2)
    60  			gen.AddTx(tx1)
    61  			gen.AddTx(tx2)
    62  		case 2:
    63  //块3为空，但由addr3开采。
    64  			gen.SetCoinbase(addr3)
    65  			gen.SetExtra([]byte("yeehaw"))
    66  		case 3:
    67  //块4包括块2和3作为叔叔头（带有修改的额外数据）。
    68  			b2 := gen.PrevBlock(1).Header()
    69  			b2.Extra = []byte("foo")
    70  			gen.AddUncle(b2)
    71  			b3 := gen.PrevBlock(2).Header()
    72  			b3.Extra = []byte("foo")
    73  			gen.AddUncle(b3)
    74  		}
    75  	})
    76  
    77  //导入链。这将运行所有块验证规则。
    78  	blockchain, _ := NewBlockChain(db, nil, gspec.Config, ethash.NewFaker(), vm.Config{}, nil)
    79  	defer blockchain.Stop()
    80  
    81  	if i, err := blockchain.InsertChain(chain); err != nil {
    82  		fmt.Printf("insert error (block %d): %v\n", chain[i].NumberU64(), err)
    83  		return
    84  	}
    85  
    86  	state, _ := blockchain.State()
    87  	fmt.Printf("last block: #%d\n", blockchain.CurrentBlock().Number())
    88  	fmt.Println("balance of addr1:", state.GetBalance(addr1))
    89  	fmt.Println("balance of addr2:", state.GetBalance(addr2))
    90  	fmt.Println("balance of addr3:", state.GetBalance(addr3))
    91  //输出：
    92  //最后一个街区：第5号
    93  //加1余额：989000
    94  //加2余额：10000
    95  //加3余额：196875000000000000001000
    96  }
    97