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
231
|
package ethchain
import (
"bytes"
"github.com/ethereum/eth-go/ethutil"
"log"
"math"
"math/big"
)
type BlockChain struct {
Ethereum EthManager
// The famous, the fabulous Mister GENESIIIIIIS (block)
genesisBlock *Block
// Last known total difficulty
TD *big.Int
LastBlockNumber uint64
CurrentBlock *Block
LastBlockHash []byte
}
func NewBlockChain(ethereum EthManager) *BlockChain {
bc := &BlockChain{}
bc.genesisBlock = NewBlockFromData(ethutil.Encode(Genesis))
bc.setLastBlock()
return bc
}
func (bc *BlockChain) Genesis() *Block {
return bc.genesisBlock
}
func (bc *BlockChain) NewBlock(coinbase []byte, txs []*Transaction) *Block {
var root interface{}
var lastBlockTime int64
hash := ZeroHash256
if bc.CurrentBlock != nil {
root = bc.CurrentBlock.state.trie.Root
hash = bc.LastBlockHash
lastBlockTime = bc.CurrentBlock.Time
}
block := CreateBlock(
root,
hash,
coinbase,
ethutil.BigPow(2, 32),
nil,
"",
txs)
if bc.CurrentBlock != nil {
var mul *big.Int
if block.Time < lastBlockTime+42 {
mul = big.NewInt(1)
} else {
mul = big.NewInt(-1)
}
diff := new(big.Int)
diff.Add(diff, bc.CurrentBlock.Difficulty)
diff.Div(diff, big.NewInt(1024))
diff.Mul(diff, mul)
diff.Add(diff, bc.CurrentBlock.Difficulty)
block.Difficulty = diff
}
return block
}
func (bc *BlockChain) HasBlock(hash []byte) bool {
data, _ := ethutil.Config.Db.Get(hash)
return len(data) != 0
}
func (bc *BlockChain) GenesisBlock() *Block {
return bc.genesisBlock
}
// Get chain return blocks from hash up to max in RLP format
func (bc *BlockChain) GetChainFromHash(hash []byte, max uint64) []interface{} {
var chain []interface{}
// Get the current hash to start with
currentHash := bc.CurrentBlock.Hash()
// Get the last number on the block chain
lastNumber := bc.BlockInfo(bc.CurrentBlock).Number
// Get the parents number
parentNumber := bc.BlockInfoByHash(hash).Number
// Get the min amount. We might not have max amount of blocks
count := uint64(math.Min(float64(lastNumber-parentNumber), float64(max)))
startNumber := parentNumber + count
num := lastNumber
for ; num > startNumber; currentHash = bc.GetBlock(currentHash).PrevHash {
num--
}
for i := uint64(0); bytes.Compare(currentHash, hash) != 0 && num >= parentNumber && i < count; i++ {
// Get the block of the chain
block := bc.GetBlock(currentHash)
currentHash = block.PrevHash
chain = append(chain, block.Value().Val)
num--
}
return chain
}
func (bc *BlockChain) GetChain(hash []byte, amount int) []*Block {
genHash := bc.genesisBlock.Hash()
block := bc.GetBlock(hash)
var blocks []*Block
for i := 0; i < amount && block != nil; block = bc.GetBlock(block.PrevHash) {
blocks = append([]*Block{block}, blocks...)
if bytes.Compare(genHash, block.Hash()) == 0 {
break
}
i++
}
return blocks
}
func AddTestNetFunds(block *Block) {
for _, addr := range []string{
"8a40bfaa73256b60764c1bf40675a99083efb075", // Gavin
"e6716f9544a56c530d868e4bfbacb172315bdead", // Jeffrey
"1e12515ce3e0f817a4ddef9ca55788a1d66bd2df", // Vit
"1a26338f0d905e295fccb71fa9ea849ffa12aaf4", // Alex
"2ef47100e0787b915105fd5e3f4ff6752079d5cb", // Maran
} {
//log.Println("2^200 Wei to", addr)
codedAddr := ethutil.FromHex(addr)
addr := block.state.GetAccount(codedAddr)
addr.Amount = ethutil.BigPow(2, 200)
block.state.UpdateAccount(codedAddr, addr)
}
}
func (bc *BlockChain) setLastBlock() {
data, _ := ethutil.Config.Db.Get([]byte("LastBlock"))
if len(data) != 0 {
block := NewBlockFromBytes(data)
info := bc.BlockInfo(block)
bc.CurrentBlock = block
bc.LastBlockHash = block.Hash()
bc.LastBlockNumber = info.Number
log.Printf("[CHAIN] Last known block height #%d\n", bc.LastBlockNumber)
} else {
AddTestNetFunds(bc.genesisBlock)
bc.genesisBlock.state.trie.Sync()
// Prepare the genesis block
bc.Add(bc.genesisBlock)
//log.Printf("root %x\n", bm.bc.genesisBlock.State().Root)
//bm.bc.genesisBlock.PrintHash()
}
// Set the last know difficulty (might be 0x0 as initial value, Genesis)
bc.TD = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
log.Printf("Last block: %x\n", bc.CurrentBlock.Hash())
}
func (bc *BlockChain) SetTotalDifficulty(td *big.Int) {
ethutil.Config.Db.Put([]byte("LastKnownTotalDifficulty"), td.Bytes())
bc.TD = td
}
// Add a block to the chain and record addition information
func (bc *BlockChain) Add(block *Block) {
bc.writeBlockInfo(block)
// Prepare the genesis block
bc.CurrentBlock = block
bc.LastBlockHash = block.Hash()
encodedBlock := block.RlpEncode()
ethutil.Config.Db.Put(block.Hash(), encodedBlock)
ethutil.Config.Db.Put([]byte("LastBlock"), encodedBlock)
}
func (bc *BlockChain) GetBlock(hash []byte) *Block {
data, _ := ethutil.Config.Db.Get(hash)
if len(data) == 0 {
return nil
}
return NewBlockFromData(data)
}
func (bc *BlockChain) BlockInfoByHash(hash []byte) BlockInfo {
bi := BlockInfo{}
data, _ := ethutil.Config.Db.Get(append(hash, []byte("Info")...))
bi.RlpDecode(data)
return bi
}
func (bc *BlockChain) BlockInfo(block *Block) BlockInfo {
bi := BlockInfo{}
data, _ := ethutil.Config.Db.Get(append(block.Hash(), []byte("Info")...))
bi.RlpDecode(data)
return bi
}
// Unexported method for writing extra non-essential block info to the db
func (bc *BlockChain) writeBlockInfo(block *Block) {
bc.LastBlockNumber++
bi := BlockInfo{Number: bc.LastBlockNumber, Hash: block.Hash(), Parent: block.PrevHash}
// For now we use the block hash with the words "info" appended as key
ethutil.Config.Db.Put(append(block.Hash(), []byte("Info")...), bi.RlpEncode())
}
func (bc *BlockChain) Stop() {
if bc.CurrentBlock != nil {
log.Println("[CHAIN] Stopped")
}
}
|
