rules

type SafetyError interface {
	error
	Common() bool
	Fetch() bool   //Is the error need fetch
	NewView() bool //need change view
	FetchPrepare() bool
}

type SafetyRules interface {
	// Security rules for proposed blocks
	PrepareBlockRules(block *protocols.PrepareBlock) SafetyError

	// Security rules for proposed votes
	PrepareVoteRules(vote *protocols.PrepareVote) SafetyError

	// Security rules for precommits
	PreCommitRules(vote *protocols.PreCommit) SafetyError

	// Security rules for viewChange
	ViewChangeRules(vote *protocols.ViewChange) SafetyError

	// Security rules for qcblock
	QCBlockRules(block *types.Block, qc *ctypes.QuorumCert) SafetyError
}

type VoteError interface {
	error
	Discard() bool //Is the error need discard
}

type VoteRules interface {
	// Determine if the resulting vote is allowed to be sent
	AllowVote(vote *protocols.PrepareVote) VoteError
	AllowPreCommit(vote *protocols.PreCommit) VoteError
}