public functions for making chains on the fly
This commit is contained in:
Ethan Buchman
parent
5a827417d9
commit
0efd6a881a
131
core/chain_makers.go
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131
core/chain_makers.go
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@ -0,0 +1,131 @@
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package core
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import (
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"fmt"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/ethutil"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/pow"
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"github.com/ethereum/go-ethereum/state"
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"math/big"
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)
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// So we can generate blocks easily
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type FakePow struct{}
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func (f FakePow) Search(block pow.Block, stop <-chan struct{}) []byte { return nil }
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func (f FakePow) Verify(block pow.Block) bool { return true }
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func (f FakePow) GetHashrate() int64 { return 0 }
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func (f FakePow) Turbo(bool) {}
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func NewBlockFromParent(addr []byte, parent *types.Block) *types.Block {
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return newBlockFromParent(addr, parent)
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}
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func MakeBlock(bman *BlockProcessor, parent *types.Block, i int, db ethutil.Database) *types.Block {
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return makeBlock(bman, parent, i, db)
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}
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func MakeChain(bman *BlockProcessor, parent *types.Block, max int, db ethutil.Database) types.Blocks {
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return makeChain(bman, parent, max, db)
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}
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func NewChainMan(block *types.Block, eventMux *event.TypeMux, db ethutil.Database) *ChainManager {
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return newChainManager(block, eventMux, db)
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}
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func NewBlockProc(db ethutil.Database, txpool *TxPool, cman *ChainManager, eventMux *event.TypeMux) *BlockProcessor {
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return newBlockProcessor(db, txpool, cman, eventMux)
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}
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func NewCanonical(n int, db ethutil.Database) (*BlockProcessor, error) {
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return newCanonical(n, db)
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}
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func newBlockFromParent(addr []byte, parent *types.Block) *types.Block {
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block := types.NewBlock(parent.Hash(), addr, parent.Root(), ethutil.BigPow(2, 32), nil, "")
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block.SetUncles(nil)
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block.SetTransactions(nil)
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block.SetReceipts(nil)
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header := block.Header()
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header.Difficulty = CalcDifficulty(block, parent)
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header.Number = new(big.Int).Add(parent.Header().Number, ethutil.Big1)
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header.GasLimit = CalcGasLimit(parent, block)
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block.Td = parent.Td
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return block
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}
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// Actually make a block by simulating what miner would do
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func makeBlock(bman *BlockProcessor, parent *types.Block, i int, db ethutil.Database) *types.Block {
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addr := ethutil.LeftPadBytes([]byte{byte(i)}, 20)
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block := newBlockFromParent(addr, parent)
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state := state.New(block.Root(), db)
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cbase := state.GetOrNewStateObject(addr)
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cbase.SetGasPool(CalcGasLimit(parent, block))
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cbase.AddBalance(BlockReward)
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state.Update(ethutil.Big0)
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block.SetRoot(state.Root())
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return block
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}
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// Make a chain with real blocks
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// Runs ProcessWithParent to get proper state roots
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func makeChain(bman *BlockProcessor, parent *types.Block, max int, db ethutil.Database) 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 := makeBlock(bman, parent, i, db)
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td, 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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}
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block.Td = td
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blocks[i] = block
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parent = block
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fmt.Printf("New Block: %x\n", block.Hash())
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}
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fmt.Println("Done making chain")
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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 ethutil.Database) *ChainManager {
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bc := &ChainManager{db: db, genesisBlock: GenesisBlock(db), eventMux: eventMux}
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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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}
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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 ethutil.Database, txpool *TxPool, cman *ChainManager, eventMux *event.TypeMux) *BlockProcessor {
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bman := NewBlockProcessor(db, txpool, newChainManager(nil, eventMux, db), eventMux)
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bman.Pow = FakePow{}
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return bman
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}
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// Make a new canonical chain by running InsertChain
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// on result of makeChain
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func newCanonical(n int, db ethutil.Database) (*BlockProcessor, error) {
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eventMux := &event.TypeMux{}
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txpool := NewTxPool(eventMux)
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bman := newBlockProcessor(db, txpool, newChainManager(nil, eventMux, db), eventMux)
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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)
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bman.bc.InsertChain(lchain)
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return bman, nil
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}
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@ -19,107 +19,11 @@ import (
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"github.com/ethereum/go-ethereum/state"
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)
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// So we can generate blocks easily
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type fakePow struct{}
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func (f fakePow) Search(block pow.Block, stop <-chan struct{}) []byte { return nil }
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func (f fakePow) Verify(block pow.Block) bool { return true }
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func (f fakePow) GetHashrate() int64 { return 0 }
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func (f fakePow) Turbo(bool) {}
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func init() {
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runtime.GOMAXPROCS(runtime.NumCPU())
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ethutil.ReadConfig("/tmp/ethtest", "/tmp/ethtest", "ETH")
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}
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func newBlockFromParent(addr []byte, parent *types.Block) *types.Block {
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block := types.NewBlock(parent.Hash(), addr, parent.Root(), ethutil.BigPow(2, 32), nil, "")
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block.SetUncles(nil)
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block.SetTransactions(nil)
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block.SetReceipts(nil)
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header := block.Header()
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header.Difficulty = CalcDifficulty(block, parent)
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header.Number = new(big.Int).Add(parent.Header().Number, ethutil.Big1)
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header.GasLimit = CalcGasLimit(parent, block)
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block.Td = parent.Td
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return block
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}
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// Actually make a block by simulating what miner would do
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func makeBlock(bman *BlockProcessor, parent *types.Block, i int, db ethutil.Database) *types.Block {
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addr := ethutil.LeftPadBytes([]byte{byte(i)}, 20)
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block := newBlockFromParent(addr, parent)
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state := state.New(block.Root(), db)
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cbase := state.GetOrNewStateObject(addr)
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cbase.SetGasPool(CalcGasLimit(parent, block))
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cbase.AddAmount(BlockReward)
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state.Update(ethutil.Big0)
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block.SetRoot(state.Root())
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return block
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}
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// Make a chain with real blocks
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// Runs ProcessWithParent to get proper state roots
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func makeChain(bman *BlockProcessor, parent *types.Block, max int, db ethutil.Database) 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 := makeBlock(bman, parent, i, db)
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td, 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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}
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block.Td = td
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blocks[i] = block
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parent = block
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fmt.Printf("New Block: %x\n", block.Hash())
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}
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fmt.Println("Done making chain")
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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 ethutil.Database) *ChainManager {
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bc := &ChainManager{db: db, genesisBlock: GenesisBlock(db), eventMux: eventMux}
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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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}
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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 ethutil.Database, txpool *TxPool, cman *ChainManager, eventMux *event.TypeMux) *BlockProcessor {
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bman := NewBlockProcessor(db, txpool, newChainManager(nil, eventMux, db), eventMux)
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bman.Pow = fakePow{}
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return bman
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}
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// Make a new canonical chain by running InsertChain
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// on result of makeChain
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func newCanonical(n int, db ethutil.Database) (*BlockProcessor, error) {
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eventMux := &event.TypeMux{}
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txpool := NewTxPool(eventMux)
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bman := newBlockProcessor(db, txpool, newChainManager(nil, eventMux, db), eventMux)
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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)
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bman.bc.InsertChain(lchain)
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return bman, nil
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}
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// Test fork of length N starting from block i
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func testFork(t *testing.T, bman *BlockProcessor, i, N int, f func(td1, td2 *big.Int)) {
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fmt.Println("Testing Fork!")
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