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package downloader
import (
"math/big"
"sync"
"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/common"
"github.com/dexon-foundation/dexon/core/state"
"github.com/dexon-foundation/dexon/core/types"
"github.com/dexon-foundation/dexon/core/vm"
"github.com/dexon-foundation/dexon/crypto"
"github.com/dexon-foundation/dexon/ethdb"
"github.com/dexon-foundation/dexon/log"
"github.com/dexon-foundation/dexon/rlp"
"github.com/dexon-foundation/dexon/trie"
)
// This is a goverance for fast sync
type governance struct {
db ethdb.Database
headRoot common.Hash
headHeight uint64
height2Root map[uint64]common.Hash
mu sync.Mutex
}
func newGovernance(headState *types.GovState) *governance {
db := ethdb.NewMemDatabase()
g := &governance{
db: db,
headRoot: headState.Root,
headHeight: headState.Number.Uint64(),
height2Root: make(map[uint64]common.Hash),
}
g.StoreState(headState)
statedb, err := state.New(headState.Root, state.NewDatabase(g.db))
if statedb == nil || err != nil {
log.Error("New governance fail", "statedb == nil", statedb == nil, "err", err)
}
return g
}
func (g *governance) getHeadHelper() *vm.GovernanceStateHelper {
return g.getHelper(g.headRoot)
}
func (g *governance) getHelperByRound(round uint64) *vm.GovernanceStateHelper {
height := g.GetRoundHeight(round)
root, exists := g.height2Root[height]
if !exists {
log.Debug("Gov get helper by round", "round", round, "exists", exists)
return nil
}
return g.getHelper(root)
}
func (g *governance) getHelper(root common.Hash) *vm.GovernanceStateHelper {
statedb, err := state.New(root, state.NewDatabase(g.db))
if statedb == nil || err != nil {
return nil
}
return &vm.GovernanceStateHelper{statedb}
}
func (g *governance) GetRoundHeight(round uint64) uint64 {
var h uint64
if helper := g.getHeadHelper(); helper != nil {
h = helper.RoundHeight(big.NewInt(int64(round))).Uint64()
}
return h
}
func (g *governance) StoreState(s *types.GovState) {
g.mu.Lock()
defer g.mu.Unlock()
// store the hight -> root mapping
g.height2Root[s.Number.Uint64()] = s.Root
// store the account
for _, node := range s.Proof {
g.db.Put(crypto.Keccak256(node), node)
}
// store the storage
triedb := trie.NewDatabase(g.db)
t, err := trie.New(common.Hash{}, triedb)
if err != nil {
panic(err)
}
for _, kv := range s.Storage {
t.TryUpdate(kv[0], kv[1])
}
t.Commit(nil)
triedb.Commit(t.Hash(), false)
if s.Number.Uint64() > g.headHeight {
log.Debug("Gov head root changed", "number", s.Number.Uint64())
g.headRoot = s.Root
g.headHeight = s.Number.Uint64()
}
}
// Return the genesis configuration if round == 0.
func (g *governance) Configuration(round uint64) *coreTypes.Config {
if round < dexCore.ConfigRoundShift {
round = 0
} else {
round -= dexCore.ConfigRoundShift
}
helper := g.getHelperByRound(round)
if helper == nil {
log.Warn("Get config helper fail", "round - round shift", round)
return nil
}
c := helper.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,
}
}
// DKGComplaints gets all the DKGComplaints of round.
func (g *governance) DKGComplaints(round uint64) []*dkgTypes.Complaint {
helper := g.getHeadHelper()
var dkgComplaints []*dkgTypes.Complaint
for _, pk := range helper.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
}
// DKGMasterPublicKeys gets all the DKGMasterPublicKey of round.
func (g *governance) DKGMasterPublicKeys(round uint64) []*dkgTypes.MasterPublicKey {
helper := g.getHeadHelper()
var dkgMasterPKs []*dkgTypes.MasterPublicKey
for _, pk := range helper.DKGMasterPublicKeys(big.NewInt(int64(round))) {
x := new(dkgTypes.MasterPublicKey)
if err := rlp.DecodeBytes(pk, x); err != nil {
panic(err)
}
dkgMasterPKs = append(dkgMasterPKs, x)
}
return dkgMasterPKs
}
// IsDKGFinal checks if DKG is final.
func (g *governance) IsDKGFinal(round uint64) bool {
helper := g.getHeadHelper()
threshold := 2*uint64(g.Configuration(round).DKGSetSize)/3 + 1
count := helper.DKGFinalizedsCount(big.NewInt(int64(round))).Uint64()
return count >= threshold
}
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