path: root/core/test/governance.go

// 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 test

import (
    "fmt"

    "github.com/dexon-foundation/dexon-consensus-core/core/types"
    "github.com/dexon-foundation/dexon-consensus-core/crypto"
    "github.com/dexon-foundation/dexon-consensus-core/crypto/eth"
    "github.com/shopspring/decimal"
)

var (
    // ErrPrivateKeyNotExists means caller request private key for an
    // unknown validator ID.
    ErrPrivateKeyNotExists = fmt.Errorf("private key not exists")
)

// Governance is an implementation of Goverance for testing purpose.
type Governance struct {
    BlockProposingInterval int
    Validators             map[types.ValidatorID]decimal.Decimal
    PrivateKeys            map[types.ValidatorID]crypto.PrivateKey
}

// NewGovernance constructs a Governance instance.
func NewGovernance(validatorCount, proposingInterval int) (
    g *Governance, err error) {
    g = &Governance{
        BlockProposingInterval: proposingInterval,
        Validators:             make(map[types.ValidatorID]decimal.Decimal),
        PrivateKeys:            make(map[types.ValidatorID]crypto.PrivateKey),
    }
    for i := 0; i < validatorCount; i++ {
        prv, err := eth.NewPrivateKey()
        if err != nil {
            return nil, err
        }
        vID := types.NewValidatorID(prv.PublicKey())
        g.Validators[vID] = decimal.NewFromFloat(0)
        g.PrivateKeys[vID] = prv
    }
    return
}

// GetValidatorSet implements Governance interface to return current
// validator set.
func (g *Governance) GetValidatorSet() map[types.ValidatorID]decimal.Decimal {
    return g.Validators
}

// GetBlockProposingInterval implements Governance interface to return maximum
// allowed block proposing interval in millisecond.
func (g *Governance) GetBlockProposingInterval() int {
    return g.BlockProposingInterval
}

// GetTotalOrderingK returns K.
func (g *Governance) GetTotalOrderingK() int {
    return 0
}

// GetPhiRatio returns phi ratio.
func (g *Governance) GetPhiRatio() float32 {
    return 0.667
}

// GetChainNumber returns the number of chains.
func (g *Governance) GetChainNumber() uint32 {
    return uint32(len(g.Validators))
}

// GetConfigurationChangeEvent Get configuration change events after a certain
// epoch.
func (g *Governance) GetConfigurationChangeEvent(
    epoch int) []types.ConfigurationChangeEvent {
    return nil
}

// GetGenesisCRS returns the CRS string.
func (g *Governance) GetGenesisCRS() string {
    return "🆕 DEXON"
}

// GetPrivateKey return the private key for that validator, this function
// is a test utility and not a general core.Governance interface.
func (g *Governance) GetPrivateKey(
    vID types.ValidatorID) (key crypto.PrivateKey, err error) {

    key, exists := g.PrivateKeys[vID]
    if !exists {
        err = ErrPrivateKeyNotExists
        return
    }
    return
}