core: add GenerateChain, GenesisBlockForTesting
This commit is contained in:
Felix Lange
committed by
Jeffrey Wilcke
Jeffrey Wilcke
parent
1d42888d30
commit
ceaf1c080b
@ -1,7 +1,6 @@
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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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@ -11,7 +10,8 @@ import (
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"github.com/ethereum/go-ethereum/pow"
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)
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// So we can generate blocks easily
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// FakePow is a non-validating proof of work implementation.
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// It returns true from Verify for any block.
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type FakePow struct{}
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func (f FakePow) Search(block pow.Block, stop <-chan struct{}) (uint64, []byte) {
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@ -23,69 +23,125 @@ func (f FakePow) Turbo(bool) {}
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// So we can deterministically seed different blockchains
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var (
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CanonicalSeed = 1
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ForkSeed = 2
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canonicalSeed = 1
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forkSeed = 2
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)
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// Utility functions for making chains on the fly
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// Exposed for sake of testing from other packages (eg. go-ethash)
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func MakeBlock(bman *BlockProcessor, parent *types.Block, i int, db common.Database, seed int) *types.Block {
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return types.NewBlock(makeHeader(parent, i, db, seed), nil, nil, nil)
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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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header *types.Header
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statedb *state.StateDB
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coinbase *state.StateObject
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txs []*types.Transaction
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receipts []*types.Receipt
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uncles []*types.Header
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}
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func MakeChain(bman *BlockProcessor, parent *types.Block, max int, db common.Database, seed int) types.Blocks {
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return makeChain(bman, parent, max, db, seed)
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}
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func NewChainMan(block *types.Block, eventMux *event.TypeMux, db common.Database) *ChainManager {
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return newChainManager(block, eventMux, db)
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}
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func NewBlockProc(db common.Database, cman *ChainManager, eventMux *event.TypeMux) *BlockProcessor {
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return newBlockProcessor(db, cman, eventMux)
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}
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func NewCanonical(n int, db common.Database) (*BlockProcessor, error) {
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return newCanonical(n, db)
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}
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// makeHeader creates the header for a new empty block, simulating
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// what miner would do. We seed chains by the first byte of the coinbase.
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func makeHeader(parent *types.Block, i int, db common.Database, seed int) *types.Header {
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var addr common.Address
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addr[0], addr[19] = byte(seed), byte(i) // 'random' coinbase
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time := parent.Time() + 10 // block time is fixed at 10 seconds
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// ensure that the block's coinbase has the block reward in the state.
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state := state.New(parent.Root(), db)
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cbase := state.GetOrNewStateObject(addr)
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cbase.SetGasLimit(CalcGasLimit(parent))
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cbase.AddBalance(BlockReward)
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state.Update()
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return &types.Header{
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Root: state.Root(),
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ParentHash: parent.Hash(),
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Coinbase: addr,
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Difficulty: CalcDifficulty(time, parent.Time(), parent.Difficulty()),
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Number: new(big.Int).Add(parent.Number(), common.Big1),
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Time: uint64(time),
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GasLimit: CalcGasLimit(parent),
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}
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}
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// makeChain creates a valid chain of empty blocks.
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func makeChain(bman *BlockProcessor, parent *types.Block, max int, db common.Database, seed int) types.Blocks {
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bman.bc.currentBlock = parent
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blocks := make(types.Blocks, max)
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for i := 0; i < max; i++ {
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block := types.NewBlock(makeHeader(parent, i, db, seed), nil, nil, nil)
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// Use ProcessWithParent to verify that we have produced a valid block.
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_, err := bman.processWithParent(block, parent)
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if err != nil {
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fmt.Println("process with parent failed", err)
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panic(err)
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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.coinbase != 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.Coinbase = addr
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b.coinbase = b.statedb.GetOrNewStateObject(addr)
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b.coinbase.SetGasLimit(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.Extra = data
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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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if b.coinbase == nil {
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b.SetCoinbase(common.Address{})
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}
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_, gas, err := ApplyMessage(NewEnv(b.statedb, nil, tx, b.header), tx, b.coinbase)
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if err != nil {
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panic(err)
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}
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b.statedb.Update()
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b.header.GasUsed.Add(b.header.GasUsed, gas)
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receipt := types.NewReceipt(b.statedb.Root().Bytes(), b.header.GasUsed)
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logs := b.statedb.GetLogs(tx.Hash())
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receipt.SetLogs(logs)
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receipt.Bloom = types.CreateBloom(types.Receipts{receipt})
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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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// 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.HasAccount(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 *types.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("block index out of range")
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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 ChainManager requires use of FakePow or
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// a similar non-validating proof of work implementation.
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func GenerateChain(parent *types.Block, db common.Database, n int, gen func(int, *BlockGen)) []*types.Block {
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statedb := state.New(parent.Root(), db)
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blocks := make(types.Blocks, n)
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genblock := func(i int, h *types.Header) *types.Block {
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b := &BlockGen{parent: parent, i: i, chain: blocks, header: h, statedb: statedb}
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if gen != nil {
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gen(i, b)
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}
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AccumulateRewards(statedb, h, b.uncles)
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statedb.Update()
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h.Root = statedb.Root()
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return types.NewBlock(h, b.txs, b.uncles, b.receipts)
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}
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for i := 0; i < n; i++ {
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header := makeHeader(parent, statedb)
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block := genblock(i, header)
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block.Td = CalcTD(block, parent)
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blocks[i] = block
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parent = block
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@ -93,41 +149,38 @@ func makeChain(bman *BlockProcessor, parent *types.Block, max int, db common.Dat
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return blocks
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}
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// Create a new chain manager starting from given block
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// Effectively a fork factory
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func newChainManager(block *types.Block, eventMux *event.TypeMux, db common.Database) *ChainManager {
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genesis := GenesisBlock(0, db)
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bc := &ChainManager{blockDb: db, stateDb: db, genesisBlock: genesis, eventMux: eventMux, pow: FakePow{}}
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bc.txState = state.ManageState(state.New(genesis.Root(), db))
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bc.futureBlocks = NewBlockCache(1000)
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if block == nil {
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bc.Reset()
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} else {
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bc.currentBlock = block
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bc.td = block.Td
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func makeHeader(parent *types.Block, state *state.StateDB) *types.Header {
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time := parent.Time() + 10 // block time is fixed at 10 seconds
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return &types.Header{
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Root: state.Root(),
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ParentHash: parent.Hash(),
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Coinbase: parent.Coinbase(),
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Difficulty: CalcDifficulty(time, parent.Time(), parent.Difficulty()),
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GasLimit: CalcGasLimit(parent),
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GasUsed: new(big.Int),
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Number: new(big.Int).Add(parent.Number(), common.Big1),
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Time: uint64(time),
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}
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return bc
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}
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// block processor with fake pow
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func newBlockProcessor(db common.Database, cman *ChainManager, eventMux *event.TypeMux) *BlockProcessor {
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chainMan := newChainManager(nil, eventMux, db)
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bman := NewBlockProcessor(db, db, FakePow{}, chainMan, eventMux)
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return bman
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}
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// Make a new, deterministic canonical chain by running InsertChain
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// on result of makeChain.
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// newCanonical creates a new deterministic canonical chain by running
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// InsertChain on the result of makeChain.
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func newCanonical(n int, db common.Database) (*BlockProcessor, error) {
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eventMux := &event.TypeMux{}
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bman := newBlockProcessor(db, newChainManager(nil, eventMux, db), eventMux)
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evmux := &event.TypeMux{}
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chainman, _ := NewChainManager(GenesisBlock(0, db), db, db, FakePow{}, evmux)
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bman := NewBlockProcessor(db, db, FakePow{}, chainman, evmux)
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bman.bc.SetProcessor(bman)
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parent := bman.bc.CurrentBlock()
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if n == 0 {
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return bman, nil
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}
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lchain := makeChain(bman, parent, n, db, CanonicalSeed)
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lchain := makeChain(parent, n, db, canonicalSeed)
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_, err := bman.bc.InsertChain(lchain)
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return bman, err
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}
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func makeChain(parent *types.Block, n int, db common.Database, seed int) []*types.Block {
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return GenerateChain(parent, db, n, func(i int, b *BlockGen) {
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b.SetCoinbase(common.Address{0: byte(seed), 19: byte(i)})
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})
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}
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