plugeth/core/chain_manager.go

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package core
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import (
"bytes"
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"fmt"
"io"
"math/big"
"sync"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/state"
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)
var (
chainlogger = logger.NewLogger("CHAIN")
jsonlogger = logger.NewJsonLogger()
blockHashPre = []byte("block-hash-")
blockNumPre = []byte("block-num-")
)
type StateQuery interface {
GetAccount(addr []byte) *state.StateObject
}
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func CalcDifficulty(block, parent *types.Header) *big.Int {
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diff := new(big.Int)
min := big.NewInt(2048)
adjust := new(big.Int).Div(parent.Difficulty, min)
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if (block.Time - parent.Time) < 8 {
diff.Add(parent.Difficulty, adjust)
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} else {
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diff.Sub(parent.Difficulty, adjust)
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}
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if diff.Cmp(min) < 0 {
return min
}
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return diff
}
func CalculateTD(block, parent *types.Block) *big.Int {
uncleDiff := new(big.Int)
for _, uncle := range block.Uncles() {
uncleDiff = uncleDiff.Add(uncleDiff, uncle.Difficulty)
}
// TD(genesis_block) = 0 and TD(B) = TD(B.parent) + sum(u.difficulty for u in B.uncles) + B.difficulty
td := new(big.Int)
td = td.Add(parent.Td, uncleDiff)
td = td.Add(td, block.Header().Difficulty)
return td
}
func CalcGasLimit(parent, block *types.Block) *big.Int {
if block.Number().Cmp(big.NewInt(0)) == 0 {
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return common.BigPow(10, 6)
}
// ((1024-1) * parent.gasLimit + (gasUsed * 6 / 5)) / 1024
previous := new(big.Int).Mul(big.NewInt(1024-1), parent.GasLimit())
current := new(big.Rat).Mul(new(big.Rat).SetInt(parent.GasUsed()), big.NewRat(6, 5))
curInt := new(big.Int).Div(current.Num(), current.Denom())
result := new(big.Int).Add(previous, curInt)
result.Div(result, big.NewInt(1024))
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return common.BigMax(GenesisGasLimit, result)
}
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type ChainManager struct {
//eth EthManager
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blockDb common.Database
stateDb common.Database
processor types.BlockProcessor
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eventMux *event.TypeMux
genesisBlock *types.Block
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// Last known total difficulty
mu sync.RWMutex
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tsmu sync.RWMutex
td *big.Int
currentBlock *types.Block
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lastBlockHash common.Hash
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transState *state.StateDB
txState *state.ManagedState
quit chan struct{}
}
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func NewChainManager(blockDb, stateDb common.Database, mux *event.TypeMux) *ChainManager {
bc := &ChainManager{blockDb: blockDb, stateDb: stateDb, genesisBlock: GenesisBlock(stateDb), eventMux: mux, quit: make(chan struct{})}
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bc.setLastBlock()
bc.transState = bc.State().Copy()
// Take ownership of this particular state
bc.txState = state.ManageState(bc.State().Copy())
go bc.update()
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return bc
}
func (self *ChainManager) Td() *big.Int {
self.mu.RLock()
defer self.mu.RUnlock()
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return self.td
}
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func (self *ChainManager) LastBlockHash() common.Hash {
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self.mu.RLock()
defer self.mu.RUnlock()
return self.lastBlockHash
}
func (self *ChainManager) CurrentBlock() *types.Block {
self.mu.RLock()
defer self.mu.RUnlock()
return self.currentBlock
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}
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func (self *ChainManager) Status() (td *big.Int, currentBlock common.Hash, genesisBlock common.Hash) {
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self.mu.RLock()
defer self.mu.RUnlock()
return self.td, self.currentBlock.Hash(), self.genesisBlock.Hash()
}
func (self *ChainManager) SetProcessor(proc types.BlockProcessor) {
self.processor = proc
}
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func (self *ChainManager) State() *state.StateDB {
return state.New(self.CurrentBlock().Root(), self.stateDb)
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}
func (self *ChainManager) TransState() *state.StateDB {
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self.tsmu.RLock()
defer self.tsmu.RUnlock()
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return self.transState
}
func (self *ChainManager) TxState() *state.ManagedState {
self.tsmu.RLock()
defer self.tsmu.RUnlock()
return self.txState
}
func (self *ChainManager) setTxState(statedb *state.StateDB) {
self.tsmu.Lock()
defer self.tsmu.Unlock()
self.txState = state.ManageState(statedb)
}
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func (self *ChainManager) setTransState(statedb *state.StateDB) {
self.transState = statedb
}
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func (bc *ChainManager) setLastBlock() {
data, _ := bc.blockDb.Get([]byte("LastBlock"))
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if len(data) != 0 {
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block := bc.GetBlock(common.BytesToHash(data))
bc.currentBlock = block
bc.lastBlockHash = block.Hash()
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// Set the last know difficulty (might be 0x0 as initial value, Genesis)
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bc.td = common.BigD(bc.blockDb.LastKnownTD())
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} else {
bc.Reset()
}
chainlogger.Infof("Last block (#%v) %x TD=%v\n", bc.currentBlock.Number(), bc.currentBlock.Hash(), bc.td)
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}
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// Block creation & chain handling
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func (bc *ChainManager) NewBlock(coinbase common.Address) *types.Block {
bc.mu.RLock()
defer bc.mu.RUnlock()
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var (
root common.Hash
parentHash common.Hash
)
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if bc.currentBlock != nil {
root = bc.currentBlock.Header().Root
parentHash = bc.lastBlockHash
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}
block := types.NewBlock(
parentHash,
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coinbase,
root,
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common.BigPow(2, 32),
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0,
"")
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block.SetUncles(nil)
block.SetTransactions(nil)
block.SetReceipts(nil)
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parent := bc.currentBlock
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if parent != nil {
header := block.Header()
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header.Difficulty = CalcDifficulty(block.Header(), parent.Header())
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header.Number = new(big.Int).Add(parent.Header().Number, common.Big1)
header.GasLimit = CalcGasLimit(parent, block)
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}
return block
}
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func (bc *ChainManager) Reset() {
bc.mu.Lock()
defer bc.mu.Unlock()
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for block := bc.currentBlock; block != nil; block = bc.GetBlock(block.Header().ParentHash) {
bc.removeBlock(block)
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}
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// Prepare the genesis block
bc.write(bc.genesisBlock)
bc.insert(bc.genesisBlock)
bc.currentBlock = bc.genesisBlock
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bc.setTotalDifficulty(common.Big("0"))
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}
func (bc *ChainManager) removeBlock(block *types.Block) {
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bc.blockDb.Delete(append(blockHashPre, block.Hash().Bytes()...))
}
func (bc *ChainManager) ResetWithGenesisBlock(gb *types.Block) {
bc.mu.Lock()
defer bc.mu.Unlock()
for block := bc.currentBlock; block != nil; block = bc.GetBlock(block.Header().ParentHash) {
bc.removeBlock(block)
}
// Prepare the genesis block
bc.genesisBlock = gb
bc.write(bc.genesisBlock)
bc.insert(bc.genesisBlock)
bc.currentBlock = bc.genesisBlock
}
// Export writes the active chain to the given writer.
func (self *ChainManager) Export(w io.Writer) error {
self.mu.RLock()
defer self.mu.RUnlock()
chainlogger.Infof("exporting %v blocks...\n", self.currentBlock.Header().Number)
for block := self.currentBlock; block != nil; block = self.GetBlock(block.Header().ParentHash) {
if err := block.EncodeRLP(w); err != nil {
return err
}
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}
return nil
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}
func (bc *ChainManager) insert(block *types.Block) {
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bc.blockDb.Put([]byte("LastBlock"), block.Hash().Bytes())
bc.currentBlock = block
bc.lastBlockHash = block.Hash()
key := append(blockNumPre, block.Number().Bytes()...)
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bc.blockDb.Put(key, bc.lastBlockHash.Bytes())
}
func (bc *ChainManager) write(block *types.Block) {
enc, _ := rlp.EncodeToBytes((*types.StorageBlock)(block))
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key := append(blockHashPre, block.Hash().Bytes()...)
bc.blockDb.Put(key, enc)
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}
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// Accessors
func (bc *ChainManager) Genesis() *types.Block {
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return bc.genesisBlock
}
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// Block fetching methods
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func (bc *ChainManager) HasBlock(hash common.Hash) bool {
data, _ := bc.blockDb.Get(append(blockHashPre, hash[:]...))
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return len(data) != 0
}
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func (self *ChainManager) GetBlockHashesFromHash(hash common.Hash, max uint64) (chain []common.Hash) {
block := self.GetBlock(hash)
if block == nil {
return
}
// XXX Could be optimised by using a different database which only holds hashes (i.e., linked list)
for i := uint64(0); i < max; i++ {
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parentHash := block.Header().ParentHash
block = self.GetBlock(parentHash)
if block == nil {
chainlogger.Infof("GetBlockHashesFromHash Parent UNKNOWN %x\n", parentHash)
break
}
chain = append(chain, block.Hash())
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if block.Header().Number.Cmp(common.Big0) <= 0 {
break
}
}
return
}
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func (self *ChainManager) GetBlock(hash common.Hash) *types.Block {
data, _ := self.blockDb.Get(append(blockHashPre, hash[:]...))
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if len(data) == 0 {
return nil
}
var block types.StorageBlock
if err := rlp.Decode(bytes.NewReader(data), &block); err != nil {
chainlogger.Errorf("invalid block RLP for hash %x: %v", hash, err)
return nil
}
return (*types.Block)(&block)
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}
func (self *ChainManager) GetBlockByNumber(num uint64) *types.Block {
self.mu.RLock()
defer self.mu.RUnlock()
key, _ := self.blockDb.Get(append(blockNumPre, big.NewInt(int64(num)).Bytes()...))
if len(key) == 0 {
return nil
}
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return self.GetBlock(common.BytesToHash(key))
}
func (self *ChainManager) GetUnclesInChain(block *types.Block, length int) (uncles []*types.Header) {
for i := 0; block != nil && i < length; i++ {
uncles = append(uncles, block.Uncles()...)
block = self.GetBlock(block.ParentHash())
}
return
}
func (self *ChainManager) GetAncestors(block *types.Block, length int) (blocks []*types.Block) {
for i := 0; i < length; i++ {
block = self.GetBlock(block.ParentHash())
if block == nil {
break
}
blocks = append(blocks, block)
}
return
}
func (bc *ChainManager) setTotalDifficulty(td *big.Int) {
bc.blockDb.Put([]byte("LTD"), td.Bytes())
bc.td = td
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}
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func (self *ChainManager) CalcTotalDiff(block *types.Block) (*big.Int, error) {
parent := self.GetBlock(block.Header().ParentHash)
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if parent == nil {
return nil, fmt.Errorf("Unable to calculate total diff without known parent %x", block.Header().ParentHash)
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}
parentTd := parent.Td
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uncleDiff := new(big.Int)
for _, uncle := range block.Uncles() {
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uncleDiff = uncleDiff.Add(uncleDiff, uncle.Difficulty)
}
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td := new(big.Int)
td = td.Add(parentTd, uncleDiff)
td = td.Add(td, block.Header().Difficulty)
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return td, nil
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}
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func (bc *ChainManager) Stop() {
close(bc.quit)
}
type queueEvent struct {
queue []interface{}
canonicalCount int
sideCount int
splitCount int
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}
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func (self *ChainManager) InsertChain(chain types.Blocks) error {
//self.tsmu.Lock()
//defer self.tsmu.Unlock()
// A queued approach to delivering events. This is generally faster than direct delivery and requires much less mutex acquiring.
var queue = make([]interface{}, len(chain))
var queueEvent = queueEvent{queue: queue}
for i, block := range chain {
// Call in to the block processor and check for errors. It's likely that if one block fails
// all others will fail too (unless a known block is returned).
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td, logs, err := self.processor.Process(block)
if err != nil {
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if IsKnownBlockErr(err) {
continue
}
h := block.Header()
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chainlogger.Infof("INVALID block #%v (%x)\n", h.Number, h.Hash().Bytes()[:4])
chainlogger.Infoln(err)
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chainlogger.Debugln(block)
return err
}
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block.Td = td
self.mu.Lock()
cblock := self.currentBlock
{
// Write block to database. Eventually we'll have to improve on this and throw away blocks that are
// not in the canonical chain.
self.write(block)
// Compare the TD of the last known block in the canonical chain to make sure it's greater.
// At this point it's possible that a different chain (fork) becomes the new canonical chain.
if td.Cmp(self.td) > 0 {
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if block.Header().Number.Cmp(new(big.Int).Add(cblock.Header().Number, common.Big1)) < 0 {
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chash := cblock.Hash()
hash := block.Hash()
chainlogger.Infof("Split detected. New head #%v (%x) TD=%v, was #%v (%x) TD=%v\n", block.Header().Number, hash[:4], td, cblock.Header().Number, chash[:4], self.td)
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queue[i] = ChainSplitEvent{block, logs}
queueEvent.splitCount++
}
self.setTotalDifficulty(td)
self.insert(block)
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jsonlogger.LogJson(&logger.EthChainNewHead{
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BlockHash: block.Hash().Hex(),
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BlockNumber: block.Number(),
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ChainHeadHash: cblock.Hash().Hex(),
BlockPrevHash: block.ParentHash().Hex(),
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})
self.setTransState(state.New(block.Root(), self.stateDb))
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self.setTxState(state.New(block.Root(), self.stateDb))
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queue[i] = ChainEvent{block, logs}
queueEvent.canonicalCount++
} else {
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queue[i] = ChainSideEvent{block, logs}
queueEvent.sideCount++
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}
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}
self.mu.Unlock()
}
go self.eventMux.Post(queueEvent)
return nil
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}
func (self *ChainManager) update() {
events := self.eventMux.Subscribe(queueEvent{})
out:
for {
select {
case ev := <-events.Chan():
switch ev := ev.(type) {
case queueEvent:
for i, event := range ev.queue {
switch event := event.(type) {
case ChainEvent:
// We need some control over the mining operation. Acquiring locks and waiting for the miner to create new block takes too long
// and in most cases isn't even necessary.
if i == ev.canonicalCount {
self.eventMux.Post(ChainHeadEvent{event.Block})
}
case ChainSplitEvent:
// On chain splits we need to reset the transaction state. We can't be sure whether the actual
// state of the accounts are still valid.
if i == ev.splitCount {
self.setTxState(state.New(event.Block.Root(), self.stateDb))
}
}
self.eventMux.Post(event)
}
}
case <-self.quit:
break out
}
}
}
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/*
// Satisfy state query interface
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func (self *ChainManager) GetAccount(addr common.Hash) *state.StateObject {
return self.State().GetAccount(addr)
}
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*/