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- // Copyright 2015 The go-ethereum Authors
- // This file is part of the go-ethereum library.
- //
- // The go-ethereum library is free software: you can redistribute it and/or modify
- // it under the terms of the GNU Lesser General Public License as published by
- // the Free Software Foundation, either version 3 of the License, or
- // (at your option) any later version.
- //
- // The go-ethereum library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU Lesser General Public License for more details.
- //
- // You should have received a copy of the GNU Lesser General Public License
- // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
- package core
- import (
- "fmt"
- "math/big"
- "github.com/ethereum/go-ethereum/consensus/ethash"
- "github.com/ethereum/go-ethereum/core/types"
- "github.com/ethereum/go-ethereum/core/vm"
- "github.com/ethereum/go-ethereum/crypto"
- "github.com/ethereum/go-ethereum/ethdb"
- "github.com/ethereum/go-ethereum/params"
- )
- func ExampleGenerateChain() {
- var (
- key1, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
- key2, _ = crypto.HexToECDSA("8a1f9a8f95be41cd7ccb6168179afb4504aefe388d1e14474d32c45c72ce7b7a")
- key3, _ = crypto.HexToECDSA("49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee")
- addr1 = crypto.PubkeyToAddress(key1.PublicKey)
- addr2 = crypto.PubkeyToAddress(key2.PublicKey)
- addr3 = crypto.PubkeyToAddress(key3.PublicKey)
- db = ethdb.NewMemDatabase()
- )
- // Ensure that key1 has some funds in the genesis block.
- gspec := &Genesis{
- Config: ¶ms.ChainConfig{HomesteadBlock: new(big.Int)},
- Alloc: GenesisAlloc{addr1: {Balance: big.NewInt(1000000)}},
- }
- genesis := gspec.MustCommit(db)
- // This call generates a chain of 5 blocks. The function runs for
- // each block and adds different features to gen based on the
- // block index.
- signer := types.HomesteadSigner{}
- chain, _ := GenerateChain(gspec.Config, genesis, ethash.NewFaker(), db, 5, func(i int, gen *BlockGen) {
- switch i {
- case 0:
- // In block 1, addr1 sends addr2 some ether.
- tx, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr1), addr2, big.NewInt(10000), params.TxGas, nil, nil), signer, key1)
- gen.AddTx(tx)
- case 1:
- // In block 2, addr1 sends some more ether to addr2.
- // addr2 passes it on to addr3.
- tx1, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr1), addr2, big.NewInt(1000), params.TxGas, nil, nil), signer, key1)
- tx2, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr2), addr3, big.NewInt(1000), params.TxGas, nil, nil), signer, key2)
- gen.AddTx(tx1)
- gen.AddTx(tx2)
- case 2:
- // Block 3 is empty but was mined by addr3.
- gen.SetCoinbase(addr3)
- gen.SetExtra([]byte("yeehaw"))
- case 3:
- // Block 4 includes blocks 2 and 3 as uncle headers (with modified extra data).
- b2 := gen.PrevBlock(1).Header()
- b2.Extra = []byte("foo")
- gen.AddUncle(b2)
- b3 := gen.PrevBlock(2).Header()
- b3.Extra = []byte("foo")
- gen.AddUncle(b3)
- }
- })
- // Import the chain. This runs all block validation rules.
- blockchain, _ := NewBlockChain(db, nil, gspec.Config, ethash.NewFaker(), vm.Config{})
- defer blockchain.Stop()
- if i, err := blockchain.InsertChain(chain); err != nil {
- fmt.Printf("insert error (block %d): %v\n", chain[i].NumberU64(), err)
- return
- }
- state, _ := blockchain.State()
- fmt.Printf("last block: #%d\n", blockchain.CurrentBlock().Number())
- fmt.Println("balance of addr1:", state.GetBalance(addr1))
- fmt.Println("balance of addr2:", state.GetBalance(addr2))
- fmt.Println("balance of addr3:", state.GetBalance(addr3))
- // Output:
- // last block: #5
- // balance of addr1: 989000
- // balance of addr2: 10000
- // balance of addr3: 19687500000000001000
- }
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