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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 test
import (
"fmt"
"sync"
"time"
"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
"github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa"
"github.com/dexon-foundation/dexon-consensus-core/core/types"
)
var (
// ErrPrivateKeyNotExists means caller request private key for an
// unknown node ID.
ErrPrivateKeyNotExists = fmt.Errorf("private key not exists")
)
// Governance is an implementation of Goverance for testing purpose.
type Governance struct {
lambdaBA time.Duration
lambdaDKG time.Duration
privateKeys map[types.NodeID]crypto.PrivateKey
tsig map[uint64]crypto.Signature
DKGComplaint map[uint64][]*types.DKGComplaint
DKGMasterPublicKey map[uint64][]*types.DKGMasterPublicKey
lock sync.RWMutex
}
// NewGovernance constructs a Governance instance.
func NewGovernance(nodeCount int, lambda time.Duration) (
g *Governance, err error) {
g = &Governance{
lambdaBA: lambda,
lambdaDKG: lambda * 10,
privateKeys: make(map[types.NodeID]crypto.PrivateKey),
tsig: make(map[uint64]crypto.Signature),
DKGComplaint: make(map[uint64][]*types.DKGComplaint),
DKGMasterPublicKey: make(map[uint64][]*types.DKGMasterPublicKey),
}
for i := 0; i < nodeCount; i++ {
prv, err := ecdsa.NewPrivateKey()
if err != nil {
return nil, err
}
nID := types.NewNodeID(prv.PublicKey())
g.privateKeys[nID] = prv
}
return
}
// GetNodeSet implements Governance interface to return current
// notary set.
func (g *Governance) GetNodeSet(_ uint64) (
ret []crypto.PublicKey) {
for _, key := range g.privateKeys {
ret = append(ret, key.PublicKey())
}
return
}
// GetConfiguration returns the configuration at a given block height.
func (g *Governance) GetConfiguration(_ uint64) *types.Config {
return &types.Config{
NumShards: 1,
NumChains: uint32(len(g.privateKeys)),
LambdaBA: g.lambdaBA,
LambdaDKG: g.lambdaDKG,
K: 0,
PhiRatio: 0.667,
}
}
// GetCRS returns the CRS for a given round.
func (g *Governance) GetCRS(round uint64) []byte {
return []byte("__ DEXON")
}
// GetPrivateKeys return the private key for that node, this function
// is a test utility and not a general Governance interface.
func (g *Governance) GetPrivateKeys() (keys []crypto.PrivateKey) {
for _, k := range g.privateKeys {
keys = append(keys, k)
}
return
}
// ProposeThresholdSignature porposes a ThresholdSignature of round.
func (g *Governance) ProposeThresholdSignature(
round uint64, signature crypto.Signature) {
g.lock.Lock()
defer g.lock.Unlock()
g.tsig[round] = signature
}
// GetThresholdSignature gets a ThresholdSignature of round.
func (g *Governance) GetThresholdSignature(round uint64) (
sig crypto.Signature, exist bool) {
g.lock.RLock()
defer g.lock.RUnlock()
sig, exist = g.tsig[round]
return
}
// AddDKGComplaint add a DKGComplaint.
func (g *Governance) AddDKGComplaint(complaint *types.DKGComplaint) {
g.lock.Lock()
defer g.lock.Unlock()
g.DKGComplaint[complaint.Round] = append(g.DKGComplaint[complaint.Round],
complaint)
}
// DKGComplaints returns the DKGComplaints of round.
func (g *Governance) DKGComplaints(round uint64) []*types.DKGComplaint {
g.lock.RLock()
defer g.lock.RUnlock()
complaints, exist := g.DKGComplaint[round]
if !exist {
return []*types.DKGComplaint{}
}
return complaints
}
// AddDKGMasterPublicKey adds a DKGMasterPublicKey.
func (g *Governance) AddDKGMasterPublicKey(
masterPublicKey *types.DKGMasterPublicKey) {
g.lock.Lock()
defer g.lock.Unlock()
g.DKGMasterPublicKey[masterPublicKey.Round] = append(
g.DKGMasterPublicKey[masterPublicKey.Round], masterPublicKey)
}
// DKGMasterPublicKeys returns the DKGMasterPublicKeys of round.
func (g *Governance) DKGMasterPublicKeys(
round uint64) []*types.DKGMasterPublicKey {
g.lock.RLock()
defer g.lock.RUnlock()
masterPublicKeys, exist := g.DKGMasterPublicKey[round]
if !exist {
return []*types.DKGMasterPublicKey{}
}
return masterPublicKeys
}
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