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307 lines
10 KiB
307 lines
10 KiB
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/harmony-one/harmony/block"
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blockfactory "github.com/harmony-one/harmony/block/factory"
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consensus_engine "github.com/harmony-one/harmony/consensus/engine"
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"github.com/harmony-one/harmony/core/state"
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"github.com/harmony-one/harmony/core/types"
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"github.com/harmony-one/harmony/core/vm"
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"github.com/harmony-one/harmony/internal/params"
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"github.com/harmony-one/harmony/shard"
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staking "github.com/harmony-one/harmony/staking/types"
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)
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// BlockGen creates blocks for testing.
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// See GenerateChain for a detailed explanation.
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type BlockGen struct {
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i int
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parent *types.Block
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chain []*types.Block
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factory blockfactory.Factory
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header *block.Header
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statedb *state.DB
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gasPool *GasPool
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txs []*types.Transaction
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receipts []*types.Receipt
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uncles []*block.Header
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config *params.ChainConfig
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engine consensus_engine.Engine
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}
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// SetCoinbase sets the coinbase of the generated block.
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// It can be called at most once.
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func (b *BlockGen) SetCoinbase(addr common.Address) {
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if b.gasPool != nil {
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if len(b.txs) > 0 {
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panic("coinbase must be set before adding transactions")
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}
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panic("coinbase can only be set once")
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}
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b.header.SetCoinbase(addr)
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b.gasPool = new(GasPool).AddGas(b.header.GasLimit())
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}
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// SetExtra sets the extra data field of the generated block.
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func (b *BlockGen) SetExtra(data []byte) {
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b.header.SetExtra(data)
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}
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// SetShardID sets the shardID field of the generated block.
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func (b *BlockGen) SetShardID(shardID uint32) {
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b.header.SetShardID(shardID)
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}
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// AddTx adds a transaction to the generated block. If no coinbase has
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// been set, the block's coinbase is set to the zero address.
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//
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// AddTx panics if the transaction cannot be executed. In addition to
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// the protocol-imposed limitations (gas limit, etc.), there are some
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// further limitations on the content of transactions that can be
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// added. Notably, contract code relying on the BLOCKHASH instruction
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// will panic during execution.
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func (b *BlockGen) AddTx(tx *types.Transaction) {
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b.AddTxWithChain(nil, tx)
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}
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// AddTxWithChain adds a transaction to the generated block. If no coinbase has
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// been set, the block's coinbase is set to the zero address.
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//
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// AddTxWithChain panics if the transaction cannot be executed. In addition to
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// the protocol-imposed limitations (gas limit, etc.), there are some
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// further limitations on the content of transactions that can be
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// added. If contract code relies on the BLOCKHASH instruction,
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// the block in chain will be returned.
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func (b *BlockGen) AddTxWithChain(bc *BlockChain, tx *types.Transaction) {
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if b.gasPool == nil {
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b.SetCoinbase(common.Address{})
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}
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b.statedb.Prepare(tx.Hash(), common.Hash{}, len(b.txs))
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coinbase := b.header.Coinbase()
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gasUsed := b.header.GasUsed()
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receipt, _, _, err := ApplyTransaction(b.config, bc, &coinbase, b.gasPool, b.statedb, b.header, tx, &gasUsed, vm.Config{})
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b.header.SetGasUsed(gasUsed)
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b.header.SetCoinbase(coinbase)
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if err != nil {
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panic(err)
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}
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b.txs = append(b.txs, tx)
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b.receipts = append(b.receipts, receipt)
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}
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// Number returns the block number of the block being generated.
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func (b *BlockGen) Number() *big.Int {
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return b.header.Number()
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}
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// AddUncheckedReceipt forcefully adds a receipts to the block without a
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// backing transaction.
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//
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// AddUncheckedReceipt will cause consensus failures when used during real
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// chain processing. This is best used in conjunction with raw block insertion.
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func (b *BlockGen) AddUncheckedReceipt(receipt *types.Receipt) {
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b.receipts = append(b.receipts, receipt)
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}
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// TxNonce returns the next valid transaction nonce for the
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// account at addr. It panics if the account does not exist.
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func (b *BlockGen) TxNonce(addr common.Address) uint64 {
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if !b.statedb.Exist(addr) {
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panic("account does not exist")
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}
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return b.statedb.GetNonce(addr)
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}
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// AddUncle adds an uncle header to the generated block.
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func (b *BlockGen) AddUncle(h *block.Header) {
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b.uncles = append(b.uncles, h)
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}
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// PrevBlock returns a previously generated block by number. It panics if
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// num is greater or equal to the number of the block being generated.
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// For index -1, PrevBlock returns the parent block given to GenerateChain.
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func (b *BlockGen) PrevBlock(index int) *types.Block {
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if index >= b.i {
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panic(fmt.Errorf("block index %d out of range (%d,%d)", index, -1, b.i))
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}
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if index == -1 {
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return b.parent
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}
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return b.chain[index]
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}
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// GenerateChain creates a chain of n blocks. The first block's
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// parent will be the provided parent. db is used to store
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// intermediate states and should contain the parent's state trie.
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//
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// The generator function is called with a new block generator for
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// every block. Any transactions and uncles added to the generator
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// become part of the block. If gen is nil, the blocks will be empty
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// and their coinbase will be the zero address.
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//
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// Blocks created by GenerateChain do not contain valid proof of work
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// values. Inserting them into BlockChain requires use of FakePow or
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// a similar non-validating proof of work implementation.
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func GenerateChain(
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config *params.ChainConfig, parent *types.Block,
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engine consensus_engine.Engine, db ethdb.Database,
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n int,
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gen func(int, *BlockGen),
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) ([]*types.Block, []types.Receipts) {
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if config == nil {
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config = params.TestChainConfig
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}
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factory := blockfactory.NewFactory(config)
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blocks, receipts := make(types.Blocks, n), make([]types.Receipts, n)
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chainreader := &fakeChainReader{config: config}
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genblock := func(i int, parent *types.Block, statedb *state.DB) (*types.Block, types.Receipts) {
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b := &BlockGen{
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i: i,
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chain: blocks,
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parent: parent,
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statedb: statedb,
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config: config,
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factory: factory,
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engine: engine,
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}
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b.header = makeHeader(chainreader, parent, statedb, b.engine, factory)
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// Execute any user modifications to the block
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if gen != nil {
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gen(i, b)
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}
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if b.engine != nil {
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// Finalize and seal the block
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block, _, err := b.engine.Finalize(
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chainreader, b.header, statedb, b.txs, b.receipts, nil, nil, nil, nil,
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)
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if err != nil {
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panic(err)
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}
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// Write state changes to db
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root, err := statedb.Commit(config.IsS3(b.header.Epoch()))
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if err != nil {
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panic(fmt.Sprintf("state write error: %v", err))
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}
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if err := statedb.Database().TrieDB().Commit(root, false); err != nil {
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panic(fmt.Sprintf("trie write error: %v", err))
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}
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return block, b.receipts
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}
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return nil, nil
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}
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for i := 0; i < n; i++ {
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statedb, err := state.New(parent.Root(), state.NewDatabase(db))
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if err != nil {
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panic(err)
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}
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block, receipt := genblock(i, parent, statedb)
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blocks[i] = block
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receipts[i] = receipt
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parent = block
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}
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return blocks, receipts
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}
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func makeHeader(chain consensus_engine.ChainReader, parent *types.Block, state *state.DB, engine consensus_engine.Engine, factory blockfactory.Factory) *block.Header {
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var time *big.Int
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if parent.Time() == nil {
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time = big.NewInt(10)
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} else {
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time = new(big.Int).Add(parent.Time(), big.NewInt(10)) // block time is fixed at 10 seconds
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}
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return factory.NewHeader(parent.Epoch()).With().
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Root(state.IntermediateRoot(chain.Config().IsS3(parent.Epoch()))).
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ParentHash(parent.Hash()).
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Coinbase(parent.Coinbase()).
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GasLimit(CalcGasLimit(parent, parent.GasLimit(), parent.GasLimit())).
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Number(new(big.Int).Add(parent.Number(), common.Big1)).
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Time(time).
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Header()
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}
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type fakeChainReader struct {
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config *params.ChainConfig
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}
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// Config returns the chain configuration.
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func (cr *fakeChainReader) Config() *params.ChainConfig {
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return cr.config
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}
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func (cr *fakeChainReader) CurrentHeader() *block.Header { return nil }
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func (cr *fakeChainReader) ShardID() uint32 { return 0 }
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func (cr *fakeChainReader) GetHeaderByNumber(number uint64) *block.Header { return nil }
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func (cr *fakeChainReader) GetHeaderByHash(hash common.Hash) *block.Header { return nil }
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func (cr *fakeChainReader) GetHeader(hash common.Hash, number uint64) *block.Header { return nil }
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func (cr *fakeChainReader) GetBlock(hash common.Hash, number uint64) *types.Block { return nil }
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func (cr *fakeChainReader) ReadShardState(epoch *big.Int) (*shard.State, error) { return nil, nil }
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func (cr *fakeChainReader) ReadValidatorList() ([]common.Address, error) { return nil, nil }
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func (cr *fakeChainReader) ValidatorCandidates() []common.Address { return nil }
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func (cr *fakeChainReader) SuperCommitteeForNextEpoch(
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beacon consensus_engine.ChainReader, header *block.Header, isVerify bool,
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) (*shard.State, error) {
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return nil, nil
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}
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func (cr *fakeChainReader) ReadValidatorInformation(
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addr common.Address,
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) (*staking.ValidatorWrapper, error) {
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return nil, nil
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}
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func (cr *fakeChainReader) ReadValidatorSnapshot(
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addr common.Address,
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) (*staking.ValidatorWrapper, error) {
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return nil, nil
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}
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func (cr *fakeChainReader) ReadValidatorSnapshotAtEpoch(
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epoch *big.Int, addr common.Address,
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) (*staking.ValidatorWrapper, error) {
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return nil, nil
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}
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func (cr *fakeChainReader) ReadBlockRewardAccumulator(
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uint64,
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) (*big.Int, error) {
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return nil, nil
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}
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func (cr *fakeChainReader) CurrentBlock() *types.Block {
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return nil
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}
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func (cr *fakeChainReader) ValidatorStakingWithDelegation(
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addr common.Address,
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) *big.Int {
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return nil
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}
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func (cr *fakeChainReader) ReadValidatorStats(
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addr common.Address,
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) (*staking.ValidatorStats, error) {
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return nil, nil
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}
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