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package core
import (
"fmt"
"math/big"
"time"
dexCore "github.com/dexon-foundation/dexon-consensus/core"
coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
dkgTypes "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
"github.com/dexon-foundation/dexon/core/state"
"github.com/dexon-foundation/dexon/core/vm"
"github.com/dexon-foundation/dexon/log"
"github.com/dexon-foundation/dexon/rlp"
)
type GovernanceStateDB interface {
State() (*state.StateDB, error)
StateAt(height uint64) (*state.StateDB, error)
}
func NewGovernanceStateDB(bc *BlockChain) GovernanceStateDB {
return &governanceStateDB{bc: bc}
}
type governanceStateDB struct {
bc *BlockChain
}
func (g *governanceStateDB) State() (*state.StateDB, error) {
return g.bc.State()
}
func (g *governanceStateDB) StateAt(height uint64) (*state.StateDB, error) {
header := g.bc.GetHeaderByNumber(height)
if header == nil {
return nil, fmt.Errorf("header at %d not exists", height)
}
return g.bc.StateAt(header.Root)
}
type Governance struct {
db GovernanceStateDB
}
func NewGovernance(db GovernanceStateDB) *Governance {
return &Governance{db: db}
}
func (g *Governance) GetHeadHelper() *vm.GovernanceStateHelper {
headState, err := g.db.State()
if err != nil {
log.Error("Governance head state not ready", "err", err)
panic(err)
}
return &vm.GovernanceStateHelper{StateDB: headState}
}
func (g *Governance) getHelperAtRound(round uint64) *vm.GovernanceStateHelper {
height := g.GetRoundHeight(round)
// Sanity check
if round != 0 && height == 0 {
log.Error("Governance state incorrect", "round", round, "got height", height)
panic("round != 0 but height == 0")
}
s, err := g.db.StateAt(height)
if err != nil {
log.Error("Governance state not ready", "round", round, "height", height, "err", err)
panic(err)
}
return &vm.GovernanceStateHelper{StateDB: s}
}
func (g *Governance) GetConfigHelper(round uint64) *vm.GovernanceStateHelper {
if round < dexCore.ConfigRoundShift {
round = 0
} else {
round -= dexCore.ConfigRoundShift
}
return g.getHelperAtRound(round)
}
func (g *Governance) GetRoundHeight(round uint64) uint64 {
return g.GetHeadHelper().RoundHeight(big.NewInt(int64(round))).Uint64()
}
func (g *Governance) Configuration(round uint64) *coreTypes.Config {
configHelper := g.GetConfigHelper(round)
c := configHelper.Configuration()
return &coreTypes.Config{
NumChains: c.NumChains,
LambdaBA: time.Duration(c.LambdaBA) * time.Millisecond,
LambdaDKG: time.Duration(c.LambdaDKG) * time.Millisecond,
K: int(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,
}
}
func (g *Governance) DKGComplaints(round uint64) []*dkgTypes.Complaint {
headHelper := g.GetHeadHelper()
var dkgComplaints []*dkgTypes.Complaint
for _, pk := range headHelper.DKGComplaints(big.NewInt(int64(round))) {
x := new(dkgTypes.Complaint)
if err := rlp.DecodeBytes(pk, x); err != nil {
panic(err)
}
dkgComplaints = append(dkgComplaints, x)
}
return dkgComplaints
}
func (g *Governance) DKGMasterPublicKeys(round uint64) []*dkgTypes.MasterPublicKey {
headHelper := g.GetHeadHelper()
return headHelper.UniqueDKGMasterPublicKeys(big.NewInt(int64(round)))
}
func (g *Governance) IsDKGFinal(round uint64) bool {
headHelper := g.GetHeadHelper()
config := g.Configuration(round)
threshold := 2*uint64(config.DKGSetSize)/3 + 1
count := headHelper.DKGFinalizedsCount(big.NewInt(int64(round))).Uint64()
return count >= threshold
}
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