// 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 . package core import ( "fmt" ) func ExampleGenerateChain() { fmt.Println("OVM breaks this... SKIPPING: Example Generate Chain fails because of the genesis.") // 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 = rawdb.NewMemoryDatabase() // ) // // 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, 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, nil, nil), signer, key1) // tx2, _ := types.SignTx(types.NewTransaction(gen.TxNonce(addr2), addr3, big.NewInt(1000), params.TxGas, nil, nil, 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{}, nil) // 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 }