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Diffstat (limited to 'vendor/github.com/dexon-foundation/dexon-consensus/core/utils/vote-filter.go')
-rw-r--r-- | vendor/github.com/dexon-foundation/dexon-consensus/core/utils/vote-filter.go | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/vote-filter.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/vote-filter.go new file mode 100644 index 000000000..a19902758 --- /dev/null +++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/vote-filter.go @@ -0,0 +1,61 @@ +// Copyright 2019 The dexon-consensus Authors +// This file is part of the dexon-consensus library. +// +// The dexon-consensus library is free software: you can redistribute it +// and/or modify it under the terms of the GNU Lesser General Public License as +// published by the Free Software Foundation, either version 3 of the License, +// or (at your option) any later version. +// +// The dexon-consensus library is distributed in the hope that it will be +// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser +// General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public License +// along with the dexon-consensus library. If not, see +// <http://www.gnu.org/licenses/>. + +package utils + +import ( + "github.com/dexon-foundation/dexon-consensus/core/types" +) + +// VoteFilter filters votes that are useless for now. +// To maximize performance, this structure is not thread-safe and will never be. +type VoteFilter struct { + Height uint64 + LockIter uint64 + Period uint64 + Confirm bool +} + +// NewVoteFilter creates a new vote filter instance. +func NewVoteFilter() *VoteFilter { + return &VoteFilter{} +} + +// Filter checks if the vote should be filtered out. +func (vf *VoteFilter) Filter(vote *types.Vote) bool { + if vote.Type == types.VoteInit { + return true + } + if vote.Position.Height < vf.Height { + return true + } else if vote.Position.Height > vf.Height { + // It's impossible to check the vote of other height. + return false + } + if vf.Confirm { + return true + } + if vote.Type == types.VotePreCom && vote.Period < vf.LockIter { + return true + } + if vote.Type == types.VoteCom && + vote.Period < vf.Period && + vote.BlockHash == types.SkipBlockHash { + return true + } + return false +} |