From 91d3c571ef5e5628917c5a27d16bc0d8d7083224 Mon Sep 17 00:00:00 2001
From: Sonic <sonic@dexon.org>
Date: Tue, 20 Nov 2018 12:12:39 +0800
Subject: core: implement insert chain, headerchain logic

---
 core/governance.go | 102 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 core/governance.go

(limited to 'core/governance.go')

diff --git a/core/governance.go b/core/governance.go
new file mode 100644
index 000000000..261db1e75
--- /dev/null
+++ b/core/governance.go
@@ -0,0 +1,102 @@
+package core
+
+import (
+	"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/vm"
+	"github.com/dexon-foundation/dexon/log"
+	"github.com/dexon-foundation/dexon/rlp"
+)
+
+type Governance struct {
+	bc *BlockChain
+}
+
+func NewGovernance(bc *BlockChain) *Governance {
+	return &Governance{bc: bc}
+}
+
+func (g *Governance) getHeadHelper() *vm.GovernanceStateHelper {
+	headState, err := g.bc.State()
+	if err != nil {
+		log.Error("get head state fail", "err", err)
+		panic(err)
+	}
+	return &vm.GovernanceStateHelper{headState}
+}
+
+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) getHelperAtRound(round uint64) *vm.GovernanceStateHelper {
+	headHelper := g.getHeadHelper()
+	height := headHelper.RoundHeight(big.NewInt(int64(round))).Uint64()
+	header := g.bc.GetHeaderByNumber(height)
+	s, err := g.bc.StateAt(header.Root)
+	if err != nil {
+		log.Error("get state fail", "err", err)
+		panic(err)
+	}
+	return &vm.GovernanceStateHelper{s}
+}
+
+func (g *Governance) Configuration(round uint64) *coreTypes.Config {
+	helper := g.getConfigHelper(round)
+	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,
+	}
+}
+
+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()
+	var dkgMasterPKs []*dkgTypes.MasterPublicKey
+	for _, pk := range headHelper.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
+}
+
+func (g *Governance) IsDKGFinal(round uint64) bool {
+	headHelper := g.getHeadHelper()
+	configHelper := g.getConfigHelper(round)
+	threshold := 2*configHelper.DKGSetSize().Uint64()/3 + 1
+	count := headHelper.DKGFinalizedsCount(big.NewInt(int64(round))).Uint64()
+	return count >= threshold
+}
-- 
cgit