aboutsummaryrefslogtreecommitdiffstats
path: root/core/governance.go
blob: 73fb0c9237909c0db21c896e3f57a753cad037c8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
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) GetHeadState() *vm.GovernanceState {
    headState, err := g.db.State()
    if err != nil {
        log.Error("Governance head state not ready", "err", err)
        panic(err)
    }
    return &vm.GovernanceState{StateDB: headState}
}

func (g *Governance) getHelperAtRound(round uint64) *vm.GovernanceState {
    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.GovernanceState{StateDB: s}
}

func (g *Governance) GetStateForConfigAtRound(round uint64) *vm.GovernanceState {
    if round < dexCore.ConfigRoundShift {
        round = 0
    } else {
        round -= dexCore.ConfigRoundShift
    }
    return g.getHelperAtRound(round)
}

func (g *Governance) GetStateAtRound(round uint64) *vm.GovernanceState {
    height := g.GetRoundHeight(round)
    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.GovernanceState{StateDB: s}
}

func (g *Governance) GetRoundHeight(round uint64) uint64 {
    return g.GetHeadState().RoundHeight(big.NewInt(int64(round))).Uint64()
}

func (g *Governance) Configuration(round uint64) *coreTypes.Config {
    configHelper := g.GetStateForConfigAtRound(round)
    c := configHelper.Configuration()
    return &coreTypes.Config{
        LambdaBA:         time.Duration(c.LambdaBA) * time.Millisecond,
        LambdaDKG:        time.Duration(c.LambdaDKG) * time.Millisecond,
        NotarySetSize:    c.NotarySetSize,
        DKGSetSize:       c.DKGSetSize,
        RoundLength:      c.RoundLength,
        MinBlockInterval: time.Duration(c.MinBlockInterval) * time.Millisecond,
    }
}

func (g *Governance) GetStateForDKGAtRound(round uint64) *vm.GovernanceState {
    dkgRound := g.GetHeadState().DKGRound().Uint64()
    if round > dkgRound {
        return nil
    }
    if round == dkgRound {
        return g.GetHeadState()
    }
    return g.GetStateAtRound(round)
}

func (g *Governance) DKGComplaints(round uint64) []*dkgTypes.Complaint {
    s := g.GetStateForDKGAtRound(round)
    if s == nil {
        return nil
    }

    var dkgComplaints []*dkgTypes.Complaint
    for _, pk := range s.DKGComplaints() {
        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 {
    s := g.GetStateForDKGAtRound(round)
    if s == nil {
        return nil
    }
    return s.UniqueDKGMasterPublicKeys()
}

func (g *Governance) IsDKGMPKReady(round uint64) bool {
    s := g.GetStateForDKGAtRound(round)
    if s == nil {
        return false
    }
    config := g.Configuration(round)
    threshold := 2*uint64(config.DKGSetSize)/3 + 1
    count := s.DKGMPKReadysCount().Uint64()
    return count >= threshold
}

func (g *Governance) IsDKGFinal(round uint64) bool {
    s := g.GetStateForDKGAtRound(round)
    if s == nil {
        return false
    }
    config := g.Configuration(round)
    threshold := 2*uint64(config.DKGSetSize)/3 + 1
    count := s.DKGFinalizedsCount().Uint64()
    return count >= threshold
}

func (g *Governance) MinGasPrice(round uint64) *big.Int {
    return g.GetStateForConfigAtRound(round).MinGasPrice()
}

func (g *Governance) DKGResetCount(round uint64) uint64 {
    return g.GetHeadState().DKGResetCount(big.NewInt(int64(round))).Uint64()
}