core/governance.go


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// Copyright 2018 The dexon-consensus-core Authors
// This file is part of the dexon-consensus-core library.
//
// The dexon-consensus-core 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-core 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-core library. If not, see
// <http://www.gnu.org/licenses/>.

package core

import (
    "github.com/shopspring/decimal"

    "github.com/dexon-foundation/dexon-consensus-core/core/types"
)

// MembershipActionType specifies the action of a membership event.
type MembershipActionType int

// Event enums.
const (
    MembershipActionAdd    MembershipActionType = 0
    MembershipActionDelete MembershipActionType = 1
)

// MembershipEvent specifies the event of membership changes.
type MembershipEvent struct {
    Epoch  int
    Action MembershipActionType
}

// Governance interface specifies interface to control the governance contract.
// Note that there are a lot more methods in the governance contract, that this
// interface only define those that are required to run the consensus algorithm.
type Governance interface {
    // Get the current validator set and it's corresponding stake.
    GetValidatorSet() map[types.ValidatorID]decimal.Decimal

    // Get block proposing interval (in milliseconds).
    GetBlockProposingInterval() int

    // Get membership events after a certain epoch.
    GetMembershipEvents(epoch int) []MembershipEvent
}