aboutsummaryrefslogtreecommitdiffstats
path: root/chain/chain_manager.go
blob: 710d96befd3a954a6fbb9155a4593022f5deb9f1 (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
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
package chain

import (
    "bytes"
    "container/list"
    "fmt"
    "math/big"

    "github.com/ethereum/go-ethereum/ethutil"
    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/state"
)

var chainlogger = logger.NewLogger("CHAIN")

type ChainManager 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

    workingChain *BlockChain
}

func NewChainManager(ethereum EthManager) *ChainManager {
    bc := &ChainManager{}
    bc.genesisBlock = NewBlockFromBytes(ethutil.Encode(Genesis))
    bc.Ethereum = ethereum

    bc.setLastBlock()

    return bc
}

func (bc *ChainManager) Genesis() *Block {
    return bc.genesisBlock
}

func (bc *ChainManager) NewBlock(coinbase []byte) *Block {
    var root interface{}
    hash := ZeroHash256

    if bc.CurrentBlock != nil {
        root = bc.CurrentBlock.Root()
        hash = bc.LastBlockHash
    }

    block := CreateBlock(
        root,
        hash,
        coinbase,
        ethutil.BigPow(2, 32),
        nil,
        "")

    block.MinGasPrice = big.NewInt(10000000000000)

    parent := bc.CurrentBlock
    if parent != nil {
        block.Difficulty = CalcDifficulty(block, parent)
        block.Number = new(big.Int).Add(bc.CurrentBlock.Number, ethutil.Big1)
        block.GasLimit = block.CalcGasLimit(bc.CurrentBlock)

    }

    return block
}

func CalcDifficulty(block, parent *Block) *big.Int {
    diff := new(big.Int)

    adjust := new(big.Int).Rsh(parent.Difficulty, 10)
    if block.Time >= parent.Time+5 {
        diff.Sub(parent.Difficulty, adjust)
    } else {
        diff.Add(parent.Difficulty, adjust)
    }

    return diff
}

func (bc *ChainManager) Reset() {
    AddTestNetFunds(bc.genesisBlock)

    bc.genesisBlock.state.Trie.Sync()
    // Prepare the genesis block
    bc.add(bc.genesisBlock)
    bc.CurrentBlock = bc.genesisBlock

    bc.SetTotalDifficulty(ethutil.Big("0"))

    // Set the last know difficulty (might be 0x0 as initial value, Genesis)
    bc.TD = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
}

func (bc *ChainManager) HasBlock(hash []byte) bool {
    data, _ := ethutil.Config.Db.Get(hash)
    return len(data) != 0
}

// TODO: At one point we might want to save a block by prevHash in the db to optimise this...
func (bc *ChainManager) HasBlockWithPrevHash(hash []byte) bool {
    block := bc.CurrentBlock

    for ; block != nil; block = bc.GetBlock(block.PrevHash) {
        if bytes.Compare(hash, block.PrevHash) == 0 {
            return true
        }
    }
    return false
}

func (bc *ChainManager) CalculateBlockTD(block *Block) *big.Int {
    blockDiff := new(big.Int)

    for _, uncle := range block.Uncles {
        blockDiff = blockDiff.Add(blockDiff, uncle.Difficulty)
    }
    blockDiff = blockDiff.Add(blockDiff, block.Difficulty)

    return blockDiff
}

func (bc *ChainManager) GenesisBlock() *Block {
    return bc.genesisBlock
}

func (self *ChainManager) GetChainHashesFromHash(hash []byte, max uint64) (chain [][]byte) {
    block := self.GetBlock(hash)
    if block == nil {
        return
    }

    // XXX Could be optimised by using a different database which only holds hashes (i.e., linked list)
    for i := uint64(0); i < max; i++ {

        chain = append(chain, block.Hash())

        if block.Number.Cmp(ethutil.Big0) <= 0 {
            break
        }

        block = self.GetBlock(block.PrevHash)
    }

    return
}

func AddTestNetFunds(block *Block) {
    for _, addr := range []string{
        "51ba59315b3a95761d0863b05ccc7a7f54703d99",
        "e4157b34ea9615cfbde6b4fda419828124b70c78",
        "b9c015918bdaba24b4ff057a92a3873d6eb201be",
        "6c386a4b26f73c802f34673f7248bb118f97424a",
        "cd2a3d9f938e13cd947ec05abc7fe734df8dd826",
        "2ef47100e0787b915105fd5e3f4ff6752079d5cb",
        "e6716f9544a56c530d868e4bfbacb172315bdead",
        "1a26338f0d905e295fccb71fa9ea849ffa12aaf4",
    } {
        codedAddr := ethutil.Hex2Bytes(addr)
        account := block.state.GetAccount(codedAddr)
        account.SetBalance(ethutil.Big("1606938044258990275541962092341162602522202993782792835301376")) //ethutil.BigPow(2, 200)
        block.state.UpdateStateObject(account)
    }
}

func (bc *ChainManager) setLastBlock() {
    data, _ := ethutil.Config.Db.Get([]byte("LastBlock"))
    if len(data) != 0 {
        // Prep genesis
        AddTestNetFunds(bc.genesisBlock)

        block := NewBlockFromBytes(data)
        bc.CurrentBlock = block
        bc.LastBlockHash = block.Hash()
        bc.LastBlockNumber = block.Number.Uint64()

        // Set the last know difficulty (might be 0x0 as initial value, Genesis)
        bc.TD = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
    } else {
        bc.Reset()
    }

    chainlogger.Infof("Last block (#%d) %x\n", bc.LastBlockNumber, bc.CurrentBlock.Hash())
}

func (bc *ChainManager) SetTotalDifficulty(td *big.Int) {
    ethutil.Config.Db.Put([]byte("LTD"), td.Bytes())
    bc.TD = td
}

// Add a block to the chain and record addition information
func (bc *ChainManager) add(block *Block) {
    bc.writeBlockInfo(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)

    chainlogger.Infof("Imported block #%d (%x...)\n", block.Number, block.Hash()[0:4])
}

func (self *ChainManager) CalcTotalDiff(block *Block) (*big.Int, error) {
    parent := self.GetBlock(block.PrevHash)
    if parent == nil {
        return nil, fmt.Errorf("Unable to calculate total diff without known parent %x", block.PrevHash)
    }

    parentTd := parent.BlockInfo().TD

    uncleDiff := new(big.Int)
    for _, uncle := range block.Uncles {
        uncleDiff = uncleDiff.Add(uncleDiff, uncle.Difficulty)
    }

    td := new(big.Int)
    td = td.Add(parentTd, uncleDiff)
    td = td.Add(td, block.Difficulty)

    return td, nil
}

func (self *ChainManager) GetBlock(hash []byte) *Block {
    data, _ := ethutil.Config.Db.Get(hash)
    if len(data) == 0 {
        if self.workingChain != nil {
            // Check the temp chain
            for e := self.workingChain.Front(); e != nil; e = e.Next() {
                if bytes.Compare(e.Value.(*link).block.Hash(), hash) == 0 {
                    return e.Value.(*link).block
                }
            }
        }

        return nil
    }

    return NewBlockFromBytes(data)
}

func (self *ChainManager) GetBlockByNumber(num uint64) *Block {
    block := self.CurrentBlock
    for ; block != nil; block = self.GetBlock(block.PrevHash) {
        if block.Number.Uint64() == num {
            break
        }
    }

    if block != nil && block.Number.Uint64() == 0 && num != 0 {
        return nil
    }

    return block
}

func (self *ChainManager) GetBlockBack(num uint64) *Block {
    block := self.CurrentBlock

    for ; num != 0 && block != nil; num-- {
        block = self.GetBlock(block.PrevHash)
    }

    return block
}

func (bc *ChainManager) BlockInfoByHash(hash []byte) BlockInfo {
    bi := BlockInfo{}
    data, _ := ethutil.Config.Db.Get(append(hash, []byte("Info")...))
    bi.RlpDecode(data)

    return bi
}

func (bc *ChainManager) 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 *ChainManager) writeBlockInfo(block *Block) {
    bc.LastBlockNumber++
    bi := BlockInfo{Number: bc.LastBlockNumber, Hash: block.Hash(), Parent: block.PrevHash, TD: bc.TD}

    // 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 *ChainManager) Stop() {
    if bc.CurrentBlock != nil {
        chainlogger.Infoln("Stopped")
    }
}

type link struct {
    block    *Block
    messages state.Messages
    td       *big.Int
}

type BlockChain struct {
    *list.List
}

func NewChain(blocks Blocks) *BlockChain {
    chain := &BlockChain{list.New()}

    for _, block := range blocks {
        chain.PushBack(&link{block, nil, nil})
    }

    return chain
}

// This function assumes you've done your checking. No checking is done at this stage anymore
func (self *ChainManager) InsertChain(chain *BlockChain) {
    for e := chain.Front(); e != nil; e = e.Next() {
        link := e.Value.(*link)

        self.add(link.block)
        self.SetTotalDifficulty(link.td)
        self.Ethereum.EventMux().Post(NewBlockEvent{link.block})
        self.Ethereum.EventMux().Post(link.messages)
    }
}

func (self *ChainManager) TestChain(chain *BlockChain) (td *big.Int, err error) {
    self.workingChain = chain
    defer func() { self.workingChain = nil }()

    for e := chain.Front(); e != nil; e = e.Next() {
        var (
            l      = e.Value.(*link)
            block  = l.block
            parent = self.GetBlock(block.PrevHash)
        )

        //fmt.Println("parent", parent)
        //fmt.Println("current", block)

        if parent == nil {
            err = fmt.Errorf("incoming chain broken on hash %x\n", block.PrevHash[0:4])
            return
        }

        var messages state.Messages
        td, messages, err = self.Ethereum.BlockManager().ProcessWithParent(block, parent)
        if err != nil {
            chainlogger.Infoln(err)
            chainlogger.Debugf("Block #%v failed (%x...)\n", block.Number, block.Hash()[0:4])
            chainlogger.Debugln(block)

            err = fmt.Errorf("incoming chain failed %v\n", err)
            return
        }
        l.td = td
        l.messages = messages
    }

    if td.Cmp(self.TD) <= 0 {
        err = &TDError{td, self.TD}
        return
    }

    self.workingChain = nil

    return
}