github.com/halybang/go-ethereum@v1.0.5-0.20180325041310-3b262bc1367c/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/wanchain/go-wanchain/consensus/ethash"
    24  	"github.com/wanchain/go-wanchain/core/types"
    25  	"github.com/wanchain/go-wanchain/core/vm"
    26  	"github.com/wanchain/go-wanchain/crypto"
    27  	"github.com/wanchain/go-wanchain/ethdb"
    28  	"github.com/wanchain/go-wanchain/params"
    29  )
    30  
    31  func ExampleChainEnv_GenerateChain() {
    32  	var (
    33  		key1, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
    34  		key2, _ = crypto.HexToECDSA("8a1f9a8f95be41cd7ccb6168179afb4504aefe388d1e14474d32c45c72ce7b7a")
    35  		key3, _ = crypto.HexToECDSA("f1572f76b75b40a7da72d6f2ee7fda3d1189c2d28f0a2f096347055abe344d7f")
    36  		addr1   = crypto.PubkeyToAddress(key1.PublicKey)
    37  		addr2   = crypto.PubkeyToAddress(key2.PublicKey)
    38  		addr3   = crypto.PubkeyToAddress(key3.PublicKey)
    39  		db, _   = ethdb.NewMemDatabase()
    40  	)
    41  
    42  	// Ensure that key1 has some funds in the genesis block.
    43  	gspec := DefaultPPOWTestingGenesisBlock()
    44  	gspec.Alloc = GenesisAlloc{addr1: {Balance: big.NewInt(1000000)}}
    45  	genesis := gspec.MustCommit(db)
    46  	engine := ethash.NewFaker(db)
    47  	// Import the chain. This runs all block validation rules.
    48  	blockchain, _ := NewBlockChain(db, gspec.Config, engine, vm.Config{})
    49  	defer blockchain.Stop()
    50  	chainEnv := NewChainEnv(params.TestChainConfig, gspec, engine, blockchain, db)
    51  
    52  	// This call generates a chain of 5 blocks. The function runs for
    53  	// each block and adds different features to gen based on the
    54  	// block index.
    55  	signer := types.NewEIP155Signer(big.NewInt(1))
    56  	chain, _ := chainEnv.GenerateChain(genesis, 5, func(i int, gen *BlockGen) {
    57  		switch i {
    58  		case 0:
    59  			// In block 1, addr1 sends addr2 some ether.
    60  			tx, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr1), addr2, big.NewInt(10000), bigTxGas, nil, nil), signer, key1)
    61  			gen.AddTx(tx)
    62  		case 1:
    63  			// In block 2, addr1 sends some more ether to addr2.
    64  			// addr2 passes it on to addr3.
    65  			tx1, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr1), addr2, big.NewInt(1000), bigTxGas, nil, nil), signer, key1)
    66  			tx2, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr2), addr3, big.NewInt(1000), bigTxGas, nil, nil), signer, key2)
    67  			gen.AddTx(tx1)
    68  			gen.AddTx(tx2)
    69  		}
    70  	})
    71  
    72  	if i, err := blockchain.InsertChain(chain); err != nil {
    73  		fmt.Printf("insert error (block %d): %v\n", chain[i].NumberU64(), err)
    74  		return
    75  	}
    76  
    77  	state, _ := blockchain.State()
    78  	fmt.Printf("last block: #%d\n", blockchain.CurrentBlock().Number())
    79  	fmt.Println("balance of addr1:", state.GetBalance(addr1))
    80  	fmt.Println("balance of addr2:", state.GetBalance(addr2))
    81  	fmt.Println("balance of addr3:", state.GetBalance(addr3))
    82  	// Output:
    83  	// last block: #5
    84  	// balance of addr1: 989000
    85  	// balance of addr2: 10000
    86  	// balance of addr3: 1000
    87  }