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package dex
import (
"context"
"math/big"
"time"
coreCommon "github.com/dexon-foundation/dexon-consensus-core/common"
coreCrypto "github.com/dexon-foundation/dexon-consensus-core/core/crypto"
"github.com/dexon-foundation/dexon-consensus-core/core/crypto/ecdsa"
coreTypes "github.com/dexon-foundation/dexon-consensus-core/core/types"
"github.com/dexon-foundation/dexon/core/vm"
"github.com/dexon-foundation/dexon/rlp"
"github.com/dexon-foundation/dexon/rpc"
)
type DexconGovernance struct {
b *DexAPIBackend
}
// NewDexconGovernance retruns a governance implementation of the DEXON
// consensus governance interface.
func NewDexconGovernance(backend *DexAPIBackend) *DexconGovernance {
return &DexconGovernance{
b: backend,
}
}
func (d *DexconGovernance) getRoundHeight(ctx context.Context, round uint64) (uint64, error) {
state, _, err := d.b.StateAndHeaderByNumber(ctx, rpc.LatestBlockNumber)
if state == nil || err != nil {
return 0, err
}
s := vm.GovernanceStateHelper{state}
return s.RoundHeight(big.NewInt(int64(round))).Uint64(), nil
}
func (d *DexconGovernance) getGovState() *vm.GovernanceStateHelper {
ctx := context.Background()
state, _, err := d.b.StateAndHeaderByNumber(ctx, rpc.LatestBlockNumber)
if state == nil || err != nil {
return nil
}
return &vm.GovernanceStateHelper{state}
}
func (d *DexconGovernance) getGovStateAtRound(round uint64) *vm.GovernanceStateHelper {
ctx := context.Background()
blockHeight, err := d.getRoundHeight(ctx, round)
if err != nil {
return nil
}
state, _, err := d.b.StateAndHeaderByNumber(ctx, rpc.BlockNumber(blockHeight))
if state == nil || err != nil {
return nil
}
return &vm.GovernanceStateHelper{state}
}
// Configuration return the total ordering K constant.
func (d *DexconGovernance) Configuration(round uint64) *coreTypes.Config {
s := d.getGovStateAtRound(round)
c := s.Configuration()
return &coreTypes.Config{
NumChains: c.NumChains,
LambdaBA: time.Duration(c.LambdaBA) * time.Millisecond,
LambdaDKG: time.Duration(c.LambdaDKG) * time.Millisecond,
K: c.K,
PhiRatio: c.PhiRatio,
NotarySetSize: c.NotarySetSize,
DKGSetSize: c.DKGSetSize,
RoundInterval: time.Duration(c.RoundInterval) * time.Millisecond,
MinBlockInterval: time.Duration(c.MinBlockInterval) * time.Millisecond,
MaxBlockInterval: time.Duration(c.MaxBlockInterval) * time.Millisecond,
}
}
// CRS returns the CRS for a given round.
func (d *DexconGovernance) CRS(round uint64) coreCommon.Hash {
s := d.getGovStateAtRound(round)
return coreCommon.Hash(s.CRS(big.NewInt(int64(round))))
}
// ProposeCRS send proposals of a new CRS
func (d *DexconGovernance) ProposeCRS(signedCRS []byte) {
}
// NodeSet returns the current notary set.
func (d *DexconGovernance) NodeSet(round uint64) []coreCrypto.PublicKey {
s := d.getGovStateAtRound(round)
var pks []coreCrypto.PublicKey
for _, n := range s.Nodes() {
pks = append(pks, ecdsa.NewPublicKeyFromByteSlice(n.PublicKey))
}
return pks
}
// AddDKGComplaint adds a DKGComplaint.
func (d *DexconGovernance) AddDKGComplaint(round uint64, complaint *coreTypes.DKGComplaint) {
}
// DKGComplaints gets all the DKGComplaints of round.
func (d *DexconGovernance) DKGComplaints(round uint64) []*coreTypes.DKGComplaint {
s := d.getGovState()
var dkgComplaints []*coreTypes.DKGComplaint
for _, pk := range s.DKGMasterPublicKeys(big.NewInt(int64(round))) {
x := new(coreTypes.DKGComplaint)
if err := rlp.DecodeBytes(pk, x); err != nil {
panic(err)
}
dkgComplaints = append(dkgComplaints, x)
}
return dkgComplaints
}
// AddDKGMasterPublicKey adds a DKGMasterPublicKey.
func (d *DexconGovernance) AddDKGMasterPublicKey(round uint64, masterPublicKey *coreTypes.DKGMasterPublicKey) {
}
// DKGMasterPublicKeys gets all the DKGMasterPublicKey of round.
func (d *DexconGovernance) DKGMasterPublicKeys(round uint64) []*coreTypes.DKGMasterPublicKey {
s := d.getGovState()
var dkgMasterPKs []*coreTypes.DKGMasterPublicKey
for _, pk := range s.DKGMasterPublicKeys(big.NewInt(int64(round))) {
x := new(coreTypes.DKGMasterPublicKey)
if err := rlp.DecodeBytes(pk, x); err != nil {
panic(err)
}
dkgMasterPKs = append(dkgMasterPKs, x)
}
return dkgMasterPKs
}
// AddDKGFinalize adds a DKG finalize message.
func (d *DexconGovernance) AddDKGFinalize(round uint64, final *coreTypes.DKGFinalize) {
}
// IsDKGFinal checks if DKG is final.
func (d *DexconGovernance) IsDKGFinal(round uint64) bool {
s := d.getGovStateAtRound(round)
threshold := 2*s.DKGSetSize().Uint64()/3 + 1
count := s.DKGFinalizedsCount(big.NewInt(int64(round))).Uint64()
return count >= threshold
}
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