github.com/FusionFoundation/efsn/v4@v4.2.0/core/chain_makers_test.go (about)

     1  // Copyright 2015 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package core
    18  
    19  import (
    20  	"fmt"
    21  	"math/big"
    22  
    23  	"github.com/FusionFoundation/efsn/v4/core/types"
    24  	"github.com/FusionFoundation/efsn/v4/core/vm"
    25  	"github.com/FusionFoundation/efsn/v4/crypto"
    26  	"github.com/FusionFoundation/efsn/v4/ethdb"
    27  	"github.com/FusionFoundation/efsn/v4/params"
    28  )
    29  
    30  func ExampleGenerateChain() {
    31  	var (
    32  		key1, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
    33  		key2, _ = crypto.HexToECDSA("8a1f9a8f95be41cd7ccb6168179afb4504aefe388d1e14474d32c45c72ce7b7a")
    34  		key3, _ = crypto.HexToECDSA("49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee")
    35  		addr1   = crypto.PubkeyToAddress(key1.PublicKey)
    36  		addr2   = crypto.PubkeyToAddress(key2.PublicKey)
    37  		addr3   = crypto.PubkeyToAddress(key3.PublicKey)
    38  		db      = ethdb.NewMemDatabase()
    39  	)
    40  
    41  	// Ensure that key1 has some funds in the genesis block.
    42  	gspec := &Genesis{
    43  		Config: &params.ChainConfig{HomesteadBlock: new(big.Int)},
    44  		Alloc:  GenesisAlloc{addr1: {Balance: big.NewInt(1000000)}},
    45  	}
    46  	genesis := gspec.MustCommit(db)
    47  
    48  	// This call generates a chain of 5 blocks. The function runs for
    49  	// each block and adds different features to gen based on the
    50  	// block index.
    51  	signer := types.HomesteadSigner{}
    52  	chain, _ := GenerateChain(gspec.Config, genesis, ethash.NewFaker(), db, 5, func(i int, gen *BlockGen) {
    53  		switch i {
    54  		case 0:
    55  			// In block 1, addr1 sends addr2 some ether.
    56  			tx, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr1), addr2, big.NewInt(10000), params.TxGas, nil, nil), signer, key1)
    57  			gen.AddTx(tx)
    58  		case 1:
    59  			// In block 2, addr1 sends some more ether to addr2.
    60  			// addr2 passes it on to addr3.
    61  			tx1, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr1), addr2, big.NewInt(1000), params.TxGas, nil, nil), signer, key1)
    62  			tx2, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr2), addr3, big.NewInt(1000), params.TxGas, nil, nil), signer, key2)
    63  			gen.AddTx(tx1)
    64  			gen.AddTx(tx2)
    65  		case 2:
    66  			// Block 3 is empty but was mined by addr3.
    67  			gen.SetCoinbase(addr3)
    68  			gen.SetExtra([]byte("yeehaw"))
    69  		case 3:
    70  			// Block 4 includes blocks 2 and 3 as uncle headers (with modified extra data).
    71  			b2 := gen.PrevBlock(1).Header()
    72  			b2.Extra = []byte("foo")
    73  			gen.AddUncle(b2)
    74  			b3 := gen.PrevBlock(2).Header()
    75  			b3.Extra = []byte("foo")
    76  			gen.AddUncle(b3)
    77  		}
    78  	})
    79  
    80  	// Import the chain. This runs all block validation rules.
    81  	blockchain, _ := NewBlockChain(db, nil, gspec.Config, ethash.NewFaker(), vm.Config{}, nil)
    82  	defer blockchain.Stop()
    83  
    84  	if i, err := blockchain.InsertChain(chain); err != nil {
    85  		fmt.Printf("insert error (block %d): %v\n", chain[i].NumberU64(), err)
    86  		return
    87  	}
    88  
    89  	state, _ := blockchain.State()
    90  	fmt.Printf("last block: #%d\n", blockchain.CurrentBlock().Number())
    91  	fmt.Println("balance of addr1:", state.GetBalance(addr1))
    92  	fmt.Println("balance of addr2:", state.GetBalance(addr2))
    93  	fmt.Println("balance of addr3:", state.GetBalance(addr3))
    94  	// Output:
    95  	// last block: #5
    96  	// balance of addr1: 989000
    97  	// balance of addr2: 10000
    98  	// balance of addr3: 19687500000000001000
    99  }