aboutsummaryrefslogtreecommitdiffstats
path: root/miner/worker.go
blob: c1f848e32782dcafeee7306034cebdef6a0306e7 (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
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package miner

import (
    "bytes"
    "fmt"
    "math/big"
    "sync"
    "sync/atomic"
    "time"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/consensus"
    "github.com/ethereum/go-ethereum/consensus/misc"
    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/core/state"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/core/vm"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/event"
    "github.com/ethereum/go-ethereum/log"
    "github.com/ethereum/go-ethereum/params"
    "gopkg.in/fatih/set.v0"
)

const (
    resultQueueSize  = 10
    miningLogAtDepth = 5

    // txChanSize is the size of channel listening to TxPreEvent.
    // The number is referenced from the size of tx pool.
    txChanSize = 4096
    // chainHeadChanSize is the size of channel listening to ChainHeadEvent.
    chainHeadChanSize = 10
    // chainSideChanSize is the size of channel listening to ChainSideEvent.
    chainSideChanSize = 10
)

// Agent can register themself with the worker
type Agent interface {
    Work() chan<- *Work
    SetReturnCh(chan<- *Result)
    Stop()
    Start()
    GetHashRate() int64
}

// Work is the workers current environment and holds
// all of the current state information
type Work struct {
    config *params.ChainConfig
    signer types.Signer

    state     *state.StateDB // apply state changes here
    ancestors *set.Set       // ancestor set (used for checking uncle parent validity)
    family    *set.Set       // family set (used for checking uncle invalidity)
    uncles    *set.Set       // uncle set
    tcount    int            // tx count in cycle

    Block *types.Block // the new block

    header   *types.Header
    txs      []*types.Transaction
    receipts []*types.Receipt

    createdAt time.Time
}

type Result struct {
    Work  *Work
    Block *types.Block
}

// worker is the main object which takes care of applying messages to the new state
type worker struct {
    config *params.ChainConfig
    engine consensus.Engine

    mu sync.Mutex

    // update loop
    mux          *event.TypeMux
    txCh         chan core.TxPreEvent
    txSub        event.Subscription
    chainHeadCh  chan core.ChainHeadEvent
    chainHeadSub event.Subscription
    chainSideCh  chan core.ChainSideEvent
    chainSideSub event.Subscription
    wg           sync.WaitGroup

    agents map[Agent]struct{}
    recv   chan *Result

    eth     Backend
    chain   *core.BlockChain
    proc    core.Validator
    chainDb ethdb.Database

    coinbase common.Address
    extra    []byte

    currentMu sync.Mutex
    current   *Work

    uncleMu        sync.Mutex
    possibleUncles map[common.Hash]*types.Block

    unconfirmed *unconfirmedBlocks // set of locally mined blocks pending canonicalness confirmations

    // atomic status counters
    mining int32
    atWork int32
}

func newWorker(config *params.ChainConfig, engine consensus.Engine, coinbase common.Address, eth Backend, mux *event.TypeMux) *worker {
    worker := &worker{
        config:         config,
        engine:         engine,
        eth:            eth,
        mux:            mux,
        txCh:           make(chan core.TxPreEvent, txChanSize),
        chainHeadCh:    make(chan core.ChainHeadEvent, chainHeadChanSize),
        chainSideCh:    make(chan core.ChainSideEvent, chainSideChanSize),
        chainDb:        eth.ChainDb(),
        recv:           make(chan *Result, resultQueueSize),
        chain:          eth.BlockChain(),
        proc:           eth.BlockChain().Validator(),
        possibleUncles: make(map[common.Hash]*types.Block),
        coinbase:       coinbase,
        agents:         make(map[Agent]struct{}),
        unconfirmed:    newUnconfirmedBlocks(eth.BlockChain(), miningLogAtDepth),
    }
    // Subscribe TxPreEvent for tx pool
    worker.txSub = eth.TxPool().SubscribeTxPreEvent(worker.txCh)
    // Subscribe events for blockchain
    worker.chainHeadSub = eth.BlockChain().SubscribeChainHeadEvent(worker.chainHeadCh)
    worker.chainSideSub = eth.BlockChain().SubscribeChainSideEvent(worker.chainSideCh)
    go worker.update()

    go worker.wait()
    worker.commitNewWork()

    return worker
}

func (self *worker) setEtherbase(addr common.Address) {
    self.mu.Lock()
    defer self.mu.Unlock()
    self.coinbase = addr
}

func (self *worker) setExtra(extra []byte) {
    self.mu.Lock()
    defer self.mu.Unlock()
    self.extra = extra
}

func (self *worker) pending() (*types.Block, *state.StateDB) {
    self.currentMu.Lock()
    defer self.currentMu.Unlock()

    if atomic.LoadInt32(&self.mining) == 0 {
        return types.NewBlock(
            self.current.header,
            self.current.txs,
            nil,
            self.current.receipts,
        ), self.current.state.Copy()
    }
    return self.current.Block, self.current.state.Copy()
}

func (self *worker) pendingBlock() *types.Block {
    self.currentMu.Lock()
    defer self.currentMu.Unlock()

    if atomic.LoadInt32(&self.mining) == 0 {
        return types.NewBlock(
            self.current.header,
            self.current.txs,
            nil,
            self.current.receipts,
        )
    }
    return self.current.Block
}

func (self *worker) start() {
    self.mu.Lock()
    defer self.mu.Unlock()

    atomic.StoreInt32(&self.mining, 1)

    // spin up agents
    for agent := range self.agents {
        agent.Start()
    }
}

func (self *worker) stop() {
    self.wg.Wait()

    self.mu.Lock()
    defer self.mu.Unlock()
    if atomic.LoadInt32(&self.mining) == 1 {
        for agent := range self.agents {
            agent.Stop()
        }
    }
    atomic.StoreInt32(&self.mining, 0)
    atomic.StoreInt32(&self.atWork, 0)
}

func (self *worker) register(agent Agent) {
    self.mu.Lock()
    defer self.mu.Unlock()
    self.agents[agent] = struct{}{}
    agent.SetReturnCh(self.recv)
}

func (self *worker) unregister(agent Agent) {
    self.mu.Lock()
    defer self.mu.Unlock()
    delete(self.agents, agent)
    agent.Stop()
}

func (self *worker) update() {
    defer self.txSub.Unsubscribe()
    defer self.chainHeadSub.Unsubscribe()
    defer self.chainSideSub.Unsubscribe()

    for {
        // A real event arrived, process interesting content
        select {
        // Handle ChainHeadEvent
        case <-self.chainHeadCh:
            self.commitNewWork()

        // Handle ChainSideEvent
        case ev := <-self.chainSideCh:
            self.uncleMu.Lock()
            self.possibleUncles[ev.Block.Hash()] = ev.Block
            self.uncleMu.Unlock()

        // Handle TxPreEvent
        case ev := <-self.txCh:
            // Apply transaction to the pending state if we're not mining
            if atomic.LoadInt32(&self.mining) == 0 {
                self.currentMu.Lock()
                acc, _ := types.Sender(self.current.signer, ev.Tx)
                txs := map[common.Address]types.Transactions{acc: {ev.Tx}}
                txset := types.NewTransactionsByPriceAndNonce(self.current.signer, txs)

                self.current.commitTransactions(self.mux, txset, self.chain, self.coinbase)
                self.currentMu.Unlock()
            } else {
                // If we're mining, but nothing is being processed, wake on new transactions
                if self.config.Clique != nil && self.config.Clique.Period == 0 {
                    self.commitNewWork()
                }
            }

        // System stopped
        case <-self.txSub.Err():
            return
        case <-self.chainHeadSub.Err():
            return
        case <-self.chainSideSub.Err():
            return
        }
    }
}

func (self *worker) wait() {
    for {
        mustCommitNewWork := true
        for result := range self.recv {
            atomic.AddInt32(&self.atWork, -1)

            if result == nil {
                continue
            }
            block := result.Block
            work := result.Work

            // Update the block hash in all logs since it is now available and not when the
            // receipt/log of individual transactions were created.
            for _, r := range work.receipts {
                for _, l := range r.Logs {
                    l.BlockHash = block.Hash()
                }
            }
            for _, log := range work.state.Logs() {
                log.BlockHash = block.Hash()
            }
            stat, err := self.chain.WriteBlockAndState(block, work.receipts, work.state)
            if err != nil {
                log.Error("Failed writing block to chain", "err", err)
                continue
            }
            // check if canon block and write transactions
            if stat == core.CanonStatTy {
                // implicit by posting ChainHeadEvent
                mustCommitNewWork = false
            }
            // Broadcast the block and announce chain insertion event
            self.mux.Post(core.NewMinedBlockEvent{Block: block})
            var (
                events []interface{}
                logs   = work.state.Logs()
            )
            events = append(events, core.ChainEvent{Block: block, Hash: block.Hash(), Logs: logs})
            if stat == core.CanonStatTy {
                events = append(events, core.ChainHeadEvent{Block: block})
            }
            self.chain.PostChainEvents(events, logs)

            // Insert the block into the set of pending ones to wait for confirmations
            self.unconfirmed.Insert(block.NumberU64(), block.Hash())

            if mustCommitNewWork {
                self.commitNewWork()
            }
        }
    }
}

// push sends a new work task to currently live miner agents.
func (self *worker) push(work *Work) {
    if atomic.LoadInt32(&self.mining) != 1 {
        return
    }
    for agent := range self.agents {
        atomic.AddInt32(&self.atWork, 1)
        if ch := agent.Work(); ch != nil {
            ch <- work
        }
    }
}

// makeCurrent creates a new environment for the current cycle.
func (self *worker) makeCurrent(parent *types.Block, header *types.Header) error {
    state, err := self.chain.StateAt(parent.Root())
    if err != nil {
        return err
    }
    work := &Work{
        config:    self.config,
        signer:    types.NewEIP155Signer(self.config.ChainId),
        state:     state,
        ancestors: set.New(),
        family:    set.New(),
        uncles:    set.New(),
        header:    header,
        createdAt: time.Now(),
    }

    // when 08 is processed ancestors contain 07 (quick block)
    for _, ancestor := range self.chain.GetBlocksFromHash(parent.Hash(), 7) {
        for _, uncle := range ancestor.Uncles() {
            work.family.Add(uncle.Hash())
        }
        work.family.Add(ancestor.Hash())
        work.ancestors.Add(ancestor.Hash())
    }

    // Keep track of transactions which return errors so they can be removed
    work.tcount = 0
    self.current = work
    return nil
}

func (self *worker) commitNewWork() {
    self.mu.Lock()
    defer self.mu.Unlock()
    self.uncleMu.Lock()
    defer self.uncleMu.Unlock()
    self.currentMu.Lock()
    defer self.currentMu.Unlock()

    tstart := time.Now()
    parent := self.chain.CurrentBlock()

    tstamp := tstart.Unix()
    if parent.Time().Cmp(new(big.Int).SetInt64(tstamp)) >= 0 {
        tstamp = parent.Time().Int64() + 1
    }
    // this will ensure we're not going off too far in the future
    if now := time.Now().Unix(); tstamp > now+1 {
        wait := time.Duration(tstamp-now) * time.Second
        log.Info("Mining too far in the future", "wait", common.PrettyDuration(wait))
        time.Sleep(wait)
    }

    num := parent.Number()
    header := &types.Header{
        ParentHash: parent.Hash(),
        Number:     num.Add(num, common.Big1),
        GasLimit:   core.CalcGasLimit(parent),
        GasUsed:    new(big.Int),
        Extra:      self.extra,
        Time:       big.NewInt(tstamp),
    }
    // Only set the coinbase if we are mining (avoid spurious block rewards)
    if atomic.LoadInt32(&self.mining) == 1 {
        header.Coinbase = self.coinbase
    }
    if err := self.engine.Prepare(self.chain, header); err != nil {
        log.Error("Failed to prepare header for mining", "err", err)
        return
    }
    // If we are care about TheDAO hard-fork check whether to override the extra-data or not
    if daoBlock := self.config.DAOForkBlock; daoBlock != nil {
        // Check whether the block is among the fork extra-override range
        limit := new(big.Int).Add(daoBlock, params.DAOForkExtraRange)
        if header.Number.Cmp(daoBlock) >= 0 && header.Number.Cmp(limit) < 0 {
            // Depending whether we support or oppose the fork, override differently
            if self.config.DAOForkSupport {
                header.Extra = common.CopyBytes(params.DAOForkBlockExtra)
            } else if bytes.Equal(header.Extra, params.DAOForkBlockExtra) {
                header.Extra = []byte{} // If miner opposes, don't let it use the reserved extra-data
            }
        }
    }
    // Could potentially happen if starting to mine in an odd state.
    err := self.makeCurrent(parent, header)
    if err != nil {
        log.Error("Failed to create mining context", "err", err)
        return
    }
    // Create the current work task and check any fork transitions needed
    work := self.current
    if self.config.DAOForkSupport && self.config.DAOForkBlock != nil && self.config.DAOForkBlock.Cmp(header.Number) == 0 {
        misc.ApplyDAOHardFork(work.state)
    }
    pending, err := self.eth.TxPool().Pending()
    if err != nil {
        log.Error("Failed to fetch pending transactions", "err", err)
        return
    }
    txs := types.NewTransactionsByPriceAndNonce(self.current.signer, pending)
    work.commitTransactions(self.mux, txs, self.chain, self.coinbase)

    // compute uncles for the new block.
    var (
        uncles    []*types.Header
        badUncles []common.Hash
    )
    for hash, uncle := range self.possibleUncles {
        if len(uncles) == 2 {
            break
        }
        if err := self.commitUncle(work, uncle.Header()); err != nil {
            log.Trace("Bad uncle found and will be removed", "hash", hash)
            log.Trace(fmt.Sprint(uncle))

            badUncles = append(badUncles, hash)
        } else {
            log.Debug("Committing new uncle to block", "hash", hash)
            uncles = append(uncles, uncle.Header())
        }
    }
    for _, hash := range badUncles {
        delete(self.possibleUncles, hash)
    }
    // Create the new block to seal with the consensus engine
    if work.Block, err = self.engine.Finalize(self.chain, header, work.state, work.txs, uncles, work.receipts); err != nil {
        log.Error("Failed to finalize block for sealing", "err", err)
        return
    }
    // We only care about logging if we're actually mining.
    if atomic.LoadInt32(&self.mining) == 1 {
        log.Info("Commit new mining work", "number", work.Block.Number(), "txs", work.tcount, "uncles", len(uncles), "elapsed", common.PrettyDuration(time.Since(tstart)))
        self.unconfirmed.Shift(work.Block.NumberU64() - 1)
    }
    self.push(work)
}

func (self *worker) commitUncle(work *Work, uncle *types.Header) error {
    hash := uncle.Hash()
    if work.uncles.Has(hash) {
        return fmt.Errorf("uncle not unique")
    }
    if !work.ancestors.Has(uncle.ParentHash) {
        return fmt.Errorf("uncle's parent unknown (%x)", uncle.ParentHash[0:4])
    }
    if work.family.Has(hash) {
        return fmt.Errorf("uncle already in family (%x)", hash)
    }
    work.uncles.Add(uncle.Hash())
    return nil
}

func (env *Work) commitTransactions(mux *event.TypeMux, txs *types.TransactionsByPriceAndNonce, bc *core.BlockChain, coinbase common.Address) {
    gp := new(core.GasPool).AddGas(env.header.GasLimit)

    var coalescedLogs []*types.Log

    for {
        // Retrieve the next transaction and abort if all done
        tx := txs.Peek()
        if tx == nil {
            break
        }
        // Error may be ignored here. The error has already been checked
        // during transaction acceptance is the transaction pool.
        //
        // We use the eip155 signer regardless of the current hf.
        from, _ := types.Sender(env.signer, tx)
        // Check whether the tx is replay protected. If we're not in the EIP155 hf
        // phase, start ignoring the sender until we do.
        if tx.Protected() && !env.config.IsEIP155(env.header.Number) {
            log.Trace("Ignoring reply protected transaction", "hash", tx.Hash(), "eip155", env.config.EIP155Block)

            txs.Pop()
            continue
        }
        // Start executing the transaction
        env.state.Prepare(tx.Hash(), common.Hash{}, env.tcount)

        err, logs := env.commitTransaction(tx, bc, coinbase, gp)
        switch err {
        case core.ErrGasLimitReached:
            // Pop the current out-of-gas transaction without shifting in the next from the account
            log.Trace("Gas limit exceeded for current block", "sender", from)
            txs.Pop()

        case core.ErrNonceTooLow:
            // New head notification data race between the transaction pool and miner, shift
            log.Trace("Skipping transaction with low nonce", "sender", from, "nonce", tx.Nonce())
            txs.Shift()

        case core.ErrNonceTooHigh:
            // Reorg notification data race between the transaction pool and miner, skip account =
            log.Trace("Skipping account with hight nonce", "sender", from, "nonce", tx.Nonce())
            txs.Pop()

        case nil:
            // Everything ok, collect the logs and shift in the next transaction from the same account
            coalescedLogs = append(coalescedLogs, logs...)
            env.tcount++
            txs.Shift()

        default:
            // Strange error, discard the transaction and get the next in line (note, the
            // nonce-too-high clause will prevent us from executing in vain).
            log.Debug("Transaction failed, account skipped", "hash", tx.Hash(), "err", err)
            txs.Shift()
        }
    }

    if len(coalescedLogs) > 0 || env.tcount > 0 {
        // make a copy, the state caches the logs and these logs get "upgraded" from pending to mined
        // logs by filling in the block hash when the block was mined by the local miner. This can
        // cause a race condition if a log was "upgraded" before the PendingLogsEvent is processed.
        cpy := make([]*types.Log, len(coalescedLogs))
        for i, l := range coalescedLogs {
            cpy[i] = new(types.Log)
            *cpy[i] = *l
        }
        go func(logs []*types.Log, tcount int) {
            if len(logs) > 0 {
                mux.Post(core.PendingLogsEvent{Logs: logs})
            }
            if tcount > 0 {
                mux.Post(core.PendingStateEvent{})
            }
        }(cpy, env.tcount)
    }
}

func (env *Work) commitTransaction(tx *types.Transaction, bc *core.BlockChain, coinbase common.Address, gp *core.GasPool) (error, []*types.Log) {
    snap := env.state.Snapshot()

    receipt, _, err := core.ApplyTransaction(env.config, bc, &coinbase, gp, env.state, env.header, tx, env.header.GasUsed, vm.Config{})
    if err != nil {
        env.state.RevertToSnapshot(snap)
        return err, nil
    }
    env.txs = append(env.txs, tx)
    env.receipts = append(env.receipts, receipt)

    return nil, receipt.Logs
}