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Merge pull request #14596 from markya0616/valid_clique_vote

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consensus/clique: choose valid votes
This commit is contained in:
Péter Szilágyi 2017-06-23 11:21:38 +03:00 committed by GitHub
commit cd88f69715
2 changed files with 23 additions and 10 deletions
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23
consensus/clique/clique.go
View File

@ -503,13 +503,24 @@ func (c *Clique) Prepare(chain consensus.ChainReader, header *types.Header) erro
header.Nonce = types.BlockNonce{}
number := header.Number.Uint64()
// Assemble the voting snapshot to check which votes make sense
snap, err := c.snapshot(chain, number-1, header.ParentHash, nil)
if err != nil {
return err
}
if number%c.config.Epoch != 0 {
c.lock.RLock()
if len(c.proposals) > 0 {
addresses := make([]common.Address, 0, len(c.proposals))
for address := range c.proposals {
// Gather all the proposals that make sense voting on
addresses := make([]common.Address, 0, len(c.proposals))
for address, authorize := range c.proposals {
if snap.validVote(address, authorize) {
addresses = append(addresses, address)
}
}
// If there's pending proposals, cast a vote on them
if len(addresses) > 0 {
header.Coinbase = addresses[rand.Intn(len(addresses))]
if c.proposals[header.Coinbase] {
copy(header.Nonce[:], nonceAuthVote)
@ -519,11 +530,7 @@ func (c *Clique) Prepare(chain consensus.ChainReader, header *types.Header) erro
}
c.lock.RUnlock()
}
// Assemble the voting snapshot and set the correct difficulty
snap, err := c.snapshot(chain, number-1, header.ParentHash, nil)
if err != nil {
return err
}
// Set the correct difficulty
header.Difficulty = diffNoTurn
if snap.inturn(header.Number.Uint64(), c.signer) {
header.Difficulty = diffInTurn

10
consensus/clique/snapshot.go
View File

@ -126,11 +126,17 @@ func (s *Snapshot) copy() *Snapshot {
return cpy
}
// validVote returns whether it makes sense to cast the specified vote in the
// given snapshot context (e.g. don't try to add an already authorized signer).
func (s *Snapshot) validVote(address common.Address, authorize bool) bool {
_, signer := s.Signers[address]
return (signer && !authorize) || (!signer && authorize)
}
// cast adds a new vote into the tally.
func (s *Snapshot) cast(address common.Address, authorize bool) bool {
// Ensure the vote is meaningful
_, signer := s.Signers[address]
if (signer && authorize) || (!signer && !authorize) {
if !s.validVote(address, authorize) {
return false
}
// Cast the vote into an existing or new tally