aboutsummaryrefslogtreecommitdiffstats
path: root/ethchain/state_object.go
blob: 337c5a3944972d76cb362236ee48dc944ea5b425 (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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
package ethchain

import (
    "fmt"
    "github.com/ethereum/eth-go/ethutil"
    "math/big"
)

type StateObject struct {
    // Address of the object
    address []byte
    // Shared attributes
    Amount     *big.Int
    ScriptHash []byte
    Nonce      uint64
    // Contract related attributes
    state      *State
    script     []byte
    initScript []byte

    // Total gas pool is the total amount of gas currently
    // left if this object is the coinbase. Gas is directly
    // purchased of the coinbase.
    gasPool *big.Int
}

// Converts an transaction in to a state object
func MakeContract(tx *Transaction, state *State) *StateObject {
    // Create contract if there's no recipient
    if tx.IsContract() {
        addr := tx.CreationAddress()

        value := tx.Value
        contract := NewContract(addr, value, ZeroHash256)

        contract.initScript = tx.Data

        state.UpdateStateObject(contract)

        return contract
    }

    return nil
}

func NewStateObject(addr []byte) *StateObject {
    return &StateObject{address: addr, Amount: new(big.Int)}
}

func NewContract(address []byte, Amount *big.Int, root []byte) *StateObject {
    contract := &StateObject{address: address, Amount: Amount, Nonce: 0}
    contract.state = NewState(ethutil.NewTrie(ethutil.Config.Db, string(root)))

    return contract
}

// Returns a newly created account
func NewAccount(address []byte, amount *big.Int) *StateObject {
    account := &StateObject{address: address, Amount: amount, Nonce: 0}

    return account
}

func NewStateObjectFromBytes(address, data []byte) *StateObject {
    object := &StateObject{address: address}
    object.RlpDecode(data)

    return object
}

func (c *StateObject) State() *State {
    return c.state
}

func (c *StateObject) N() *big.Int {
    return big.NewInt(int64(c.Nonce))
}

func (c *StateObject) Addr(addr []byte) *ethutil.Value {
    return ethutil.NewValueFromBytes([]byte(c.state.trie.Get(string(addr))))
}

func (c *StateObject) SetAddr(addr []byte, value interface{}) {
    c.state.trie.Update(string(addr), string(ethutil.NewValue(value).Encode()))
}

func (c *StateObject) SetStorage(num *big.Int, val *ethutil.Value) {
    addr := ethutil.BigToBytes(num, 256)
    //fmt.Printf("sstore %x => %v\n", addr, val)
    c.SetAddr(addr, val)
}

func (c *StateObject) GetStorage(num *big.Int) *ethutil.Value {
    nb := ethutil.BigToBytes(num, 256)

    return c.Addr(nb)
}

/* DEPRECATED */
func (c *StateObject) GetMem(num *big.Int) *ethutil.Value {
    return c.GetStorage(num)
}

func (c *StateObject) GetInstr(pc *big.Int) *ethutil.Value {
    if int64(len(c.script)-1) < pc.Int64() {
        return ethutil.NewValue(0)
    }

    return ethutil.NewValueFromBytes([]byte{c.script[pc.Int64()]})
}

// Return the gas back to the origin. Used by the Virtual machine or Closures
func (c *StateObject) ReturnGas(gas, price *big.Int, state *State) {
    /*
        remainder := new(big.Int).Mul(gas, price)
        c.AddAmount(remainder)
    */
}

func (c *StateObject) AddAmount(amount *big.Int) {
    c.SetAmount(new(big.Int).Add(c.Amount, amount))

    ethutil.Config.Log.Printf(ethutil.LogLevelSystem, "%x: #%d %v (+ %v)\n", c.Address(), c.Nonce, c.Amount, amount)
}

func (c *StateObject) SubAmount(amount *big.Int) {
    c.SetAmount(new(big.Int).Sub(c.Amount, amount))

    ethutil.Config.Log.Printf(ethutil.LogLevelSystem, "%x: #%d %v (- %v)\n", c.Address(), c.Nonce, c.Amount, amount)
}

func (c *StateObject) SetAmount(amount *big.Int) {
    c.Amount = amount
}

func (c *StateObject) ConvertGas(gas, price *big.Int) error {
    total := new(big.Int).Mul(gas, price)
    if total.Cmp(c.Amount) > 0 {
        return fmt.Errorf("insufficient amount: %v, %v", c.Amount, total)
    }

    c.SubAmount(total)

    return nil
}

func (self *StateObject) SetGasPool(gasLimit *big.Int) {
    self.gasPool = new(big.Int).Set(gasLimit)

    ethutil.Config.Log.Printf(ethutil.LogLevelSystem, "%x fuel (+ %v)", self.Address(), self.gasPool)
}

func (self *StateObject) BuyGas(gas, price *big.Int) error {
    if self.gasPool.Cmp(gas) < 0 {
        return GasLimitError(self.gasPool, gas)
    }

    rGas := new(big.Int).Set(gas)
    rGas.Mul(rGas, price)

    self.AddAmount(rGas)

    return nil
}

func (self *StateObject) Copy() *StateObject {
    stCopy := &StateObject{}
    stCopy.address = make([]byte, len(self.address))
    copy(stCopy.address, self.address)
    stCopy.Amount = new(big.Int).Set(self.Amount)
    stCopy.ScriptHash = make([]byte, len(self.ScriptHash))
    copy(stCopy.ScriptHash, self.ScriptHash)
    stCopy.Nonce = self.Nonce
    if self.state != nil {
        stCopy.state = self.state.Copy()
    }
    stCopy.script = make([]byte, len(self.script))
    copy(stCopy.script, self.script)
    stCopy.initScript = make([]byte, len(self.initScript))
    copy(stCopy.initScript, self.initScript)

    return stCopy
}

// Returns the address of the contract/account
func (c *StateObject) Address() []byte {
    return c.address
}

// Returns the main script body
func (c *StateObject) Script() []byte {
    return c.script
}

// Returns the initialization script
func (c *StateObject) Init() []byte {
    return c.initScript
}

// State object encoding methods
func (c *StateObject) RlpEncode() []byte {
    var root interface{}
    if c.state != nil {
        root = c.state.trie.Root
    } else {
        root = ""
    }

    return ethutil.Encode([]interface{}{c.Nonce, c.Amount, root, ethutil.Sha3Bin(c.script)})
}

func (c *StateObject) RlpDecode(data []byte) {
    decoder := ethutil.NewValueFromBytes(data)

    c.Nonce = decoder.Get(0).Uint()
    c.Amount = decoder.Get(1).BigInt()
    c.state = NewState(ethutil.NewTrie(ethutil.Config.Db, decoder.Get(2).Interface()))

    c.ScriptHash = decoder.Get(3).Bytes()

    c.script, _ = ethutil.Config.Db.Get(c.ScriptHash)
}

// Storage change object. Used by the manifest for notifying changes to
// the sub channels.
type StorageState struct {
    StateAddress []byte
    Address      []byte
    Value        *big.Int
}