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FindCanonicalChain returns true or false when we are on the Canonical chain or not

This commit is contained in:
Maran 2014-03-24 10:24:06 +01:00
parent b52b1fca89
commit 274d5cc91c
2 changed files with 15 additions and 4 deletions
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5
ethchain/block_chain.go
View File

@ -103,7 +103,8 @@ func (bc *BlockChain) CalculateBlockTD(block *Block) *big.Int {
}
// Is tasked by finding the CanonicalChain and resetting the chain if we are not the Conical one
func (bc *BlockChain) FindCanonicalChain(msg *ethwire.Msg, commonBlockHash []byte) {
// Return true if we are the using the canonical chain false if not
func (bc *BlockChain) FindCanonicalChain(msg *ethwire.Msg, commonBlockHash []byte) bool {
// 1. Calculate TD of the current chain
// 2. Calculate TD of the new chain
// Reset state to the correct one
@ -138,8 +139,10 @@ func (bc *BlockChain) FindCanonicalChain(msg *ethwire.Msg, commonBlockHash []byt
if chainDifficulty.Cmp(curChainDifficulty) == 1 {
log.Println("[BCHAIN] The incoming Chain beat our asses, resetting")
bc.ResetTillBlockHash(commonBlockHash)
return false
} else {
log.Println("[BCHAIN] Our chain showed the incoming chain who is boss. Ignoring.")
return true
}
}
func (bc *BlockChain) ResetTillBlockHash(hash []byte) error {

14
peer.go
View File

@ -316,11 +316,18 @@ func (p *Peer) HandleInbound() {
// 3. Yes: Let's continue what we are doing
// 4. No: Let's request more blocks back.
// Make sure we are actually receiving anything
if msg.Data.Len()-1 > 1 {
// We requested blocks and now we need to make sure we have a common ancestor somewhere in these blocks so we can find
// common ground to start syncing from
lastBlock = ethchain.NewBlockFromRlpValue(msg.Data.Get(msg.Data.Len() - 1))
if p.ethereum.StateManager().BlockChain().HasBlock(lastBlock.Hash()) {
fmt.Println("[PEER] We found a common ancestor, let's continue.")
} else {
// If we can't find a common ancenstor we need to request more blocks.
// FIXME: At one point this won't scale anymore since we are not asking for an offset
// we just keep increasing the amount of blocks.
fmt.Println("[PEER] No common ancestor found, requesting more blocks.")
p.blocksRequested = p.blocksRequested * 2
p.catchingUp = false
@ -329,14 +336,16 @@ func (p *Peer) HandleInbound() {
for i := msg.Data.Len() - 1; i >= 0; i-- {
block = ethchain.NewBlockFromRlpValue(msg.Data.Get(i))
// Do we have this block on our chain?
// Do we have this block on our chain? If so we can continue
if p.ethereum.StateManager().BlockChain().HasBlock(block.Hash()) {
fmt.Println("[PEER] Block found, checking next one.")
} else {
// We don't have this block, but we do have a block with the same prevHash, diversion time!
if p.ethereum.StateManager().BlockChain().HasBlockWithPrevHash(block.PrevHash) {
fmt.Printf("[PEER] Local and foreign chain have diverted after %x, we are going to get freaky with it!\n", block.PrevHash)
p.ethereum.StateManager().BlockChain().FindCanonicalChain(msg, block.PrevHash)
if p.ethereum.StateManager().BlockChain().FindCanonicalChain(msg, block.PrevHash) {
return
}
} else {
fmt.Println("[PEER] Both local and foreign chain have same parent. Continue normally")
}
@ -358,7 +367,6 @@ func (p *Peer) HandleInbound() {
}
break
} else {
ethutil.Config.Log.Infof("[PEER] Block %x added\n", block.Hash())
lastBlock = block
}
}