aboutsummaryrefslogtreecommitdiffstats
path: root/eth/api.go
blob: c2fdbe99c26c42a52a7f4257b4d58b4d058543e4 (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
// 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 eth

import (
    "bytes"
    "errors"
    "fmt"
    "io"
    "io/ioutil"
    "math/big"
    "os"
    "runtime"
    "time"

    "github.com/ethereum/ethash"
    "github.com/ethereum/go-ethereum/common"
    "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/internal/ethapi"
    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/logger/glog"
    "github.com/ethereum/go-ethereum/miner"
    "github.com/ethereum/go-ethereum/rlp"
    "github.com/ethereum/go-ethereum/rpc"
    "golang.org/x/net/context"
)

const defaultTraceTimeout = 5 * time.Second

// PublicEthereumAPI provides an API to access Ethereum full node-related
// information.
type PublicEthereumAPI struct {
    e *Ethereum
}

// NewPublicEthereumAPI creates a new Etheruem protocol API for full nodes.
func NewPublicEthereumAPI(e *Ethereum) *PublicEthereumAPI {
    return &PublicEthereumAPI{e}
}

// Etherbase is the address that mining rewards will be send to
func (s *PublicEthereumAPI) Etherbase() (common.Address, error) {
    return s.e.Etherbase()
}

// Coinbase is the address that mining rewards will be send to (alias for Etherbase)
func (s *PublicEthereumAPI) Coinbase() (common.Address, error) {
    return s.Etherbase()
}

// Hashrate returns the POW hashrate
func (s *PublicEthereumAPI) Hashrate() *rpc.HexNumber {
    return rpc.NewHexNumber(s.e.Miner().HashRate())
}

// PublicMinerAPI provides an API to control the miner.
// It offers only methods that operate on data that pose no security risk when it is publicly accessible.
type PublicMinerAPI struct {
    e     *Ethereum
    agent *miner.RemoteAgent
}

// NewPublicMinerAPI create a new PublicMinerAPI instance.
func NewPublicMinerAPI(e *Ethereum) *PublicMinerAPI {
    agent := miner.NewRemoteAgent()
    e.Miner().Register(agent)

    return &PublicMinerAPI{e, agent}
}

// Mining returns an indication if this node is currently mining.
func (s *PublicMinerAPI) Mining() bool {
    return s.e.IsMining()
}

// SubmitWork can be used by external miner to submit their POW solution. It returns an indication if the work was
// accepted. Note, this is not an indication if the provided work was valid!
func (s *PublicMinerAPI) SubmitWork(nonce rpc.HexNumber, solution, digest common.Hash) bool {
    return s.agent.SubmitWork(nonce.Uint64(), digest, solution)
}

// GetWork returns a work package for external miner. The work package consists of 3 strings
// result[0], 32 bytes hex encoded current block header pow-hash
// result[1], 32 bytes hex encoded seed hash used for DAG
// result[2], 32 bytes hex encoded boundary condition ("target"), 2^256/difficulty
func (s *PublicMinerAPI) GetWork() (work [3]string, err error) {
    if !s.e.IsMining() {
        if err := s.e.StartMining(0, ""); err != nil {
            return work, err
        }
    }
    if work, err = s.agent.GetWork(); err == nil {
        return
    }
    glog.V(logger.Debug).Infof("%v", err)
    return work, fmt.Errorf("mining not ready")
}

// SubmitHashrate can be used for remote miners to submit their hash rate. This enables the node to report the combined
// hash rate of all miners which submit work through this node. It accepts the miner hash rate and an identifier which
// must be unique between nodes.
func (s *PublicMinerAPI) SubmitHashrate(hashrate rpc.HexNumber, id common.Hash) bool {
    s.agent.SubmitHashrate(id, hashrate.Uint64())
    return true
}

// PrivateMinerAPI provides private RPC methods to control the miner.
// These methods can be abused by external users and must be considered insecure for use by untrusted users.
type PrivateMinerAPI struct {
    e *Ethereum
}

// NewPrivateMinerAPI create a new RPC service which controls the miner of this node.
func NewPrivateMinerAPI(e *Ethereum) *PrivateMinerAPI {
    return &PrivateMinerAPI{e: e}
}

// Start the miner with the given number of threads. If threads is nil the number of
// workers started is equal to the number of logical CPU's that are usable by this process.
func (s *PrivateMinerAPI) Start(threads *rpc.HexNumber) (bool, error) {
    s.e.StartAutoDAG()

    if threads == nil {
        threads = rpc.NewHexNumber(runtime.NumCPU())
    }

    err := s.e.StartMining(threads.Int(), "")
    if err == nil {
        return true, nil
    }
    return false, err
}

// Stop the miner
func (s *PrivateMinerAPI) Stop() bool {
    s.e.StopMining()
    return true
}

// SetExtra sets the extra data string that is included when this miner mines a block.
func (s *PrivateMinerAPI) SetExtra(extra string) (bool, error) {
    if err := s.e.Miner().SetExtra([]byte(extra)); err != nil {
        return false, err
    }
    return true, nil
}

// SetGasPrice sets the minimum accepted gas price for the miner.
func (s *PrivateMinerAPI) SetGasPrice(gasPrice rpc.HexNumber) bool {
    s.e.Miner().SetGasPrice(gasPrice.BigInt())
    return true
}

// SetEtherbase sets the etherbase of the miner
func (s *PrivateMinerAPI) SetEtherbase(etherbase common.Address) bool {
    s.e.SetEtherbase(etherbase)
    return true
}

// StartAutoDAG starts auto DAG generation. This will prevent the DAG generating on epoch change
// which will cause the node to stop mining during the generation process.
func (s *PrivateMinerAPI) StartAutoDAG() bool {
    s.e.StartAutoDAG()
    return true
}

// StopAutoDAG stops auto DAG generation
func (s *PrivateMinerAPI) StopAutoDAG() bool {
    s.e.StopAutoDAG()
    return true
}

// MakeDAG creates the new DAG for the given block number
func (s *PrivateMinerAPI) MakeDAG(blockNr rpc.BlockNumber) (bool, error) {
    if err := ethash.MakeDAG(uint64(blockNr.Int64()), ""); err != nil {
        return false, err
    }
    return true, nil
}

// PrivateAdminAPI is the collection of Etheruem full node-related APIs
// exposed over the private admin endpoint.
type PrivateAdminAPI struct {
    eth *Ethereum
}

// NewPrivateAdminAPI creates a new API definition for the full node private
// admin methods of the Ethereum service.
func NewPrivateAdminAPI(eth *Ethereum) *PrivateAdminAPI {
    return &PrivateAdminAPI{eth: eth}
}

// ExportChain exports the current blockchain into a local file.
func (api *PrivateAdminAPI) ExportChain(file string) (bool, error) {
    // Make sure we can create the file to export into
    out, err := os.OpenFile(file, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.ModePerm)
    if err != nil {
        return false, err
    }
    defer out.Close()

    // Export the blockchain
    if err := api.eth.BlockChain().Export(out); err != nil {
        return false, err
    }
    return true, nil
}

func hasAllBlocks(chain *core.BlockChain, bs []*types.Block) bool {
    for _, b := range bs {
        if !chain.HasBlock(b.Hash()) {
            return false
        }
    }

    return true
}

// ImportChain imports a blockchain from a local file.
func (api *PrivateAdminAPI) ImportChain(file string) (bool, error) {
    // Make sure the can access the file to import
    in, err := os.Open(file)
    if err != nil {
        return false, err
    }
    defer in.Close()

    // Run actual the import in pre-configured batches
    stream := rlp.NewStream(in, 0)

    blocks, index := make([]*types.Block, 0, 2500), 0
    for batch := 0; ; batch++ {
        // Load a batch of blocks from the input file
        for len(blocks) < cap(blocks) {
            block := new(types.Block)
            if err := stream.Decode(block); err == io.EOF {
                break
            } else if err != nil {
                return false, fmt.Errorf("block %d: failed to parse: %v", index, err)
            }
            blocks = append(blocks, block)
            index++
        }
        if len(blocks) == 0 {
            break
        }

        if hasAllBlocks(api.eth.BlockChain(), blocks) {
            blocks = blocks[:0]
            continue
        }
        // Import the batch and reset the buffer
        if _, err := api.eth.BlockChain().InsertChain(blocks); err != nil {
            return false, fmt.Errorf("batch %d: failed to insert: %v", batch, err)
        }
        blocks = blocks[:0]
    }
    return true, nil
}

// PublicDebugAPI is the collection of Etheruem full node APIs exposed
// over the public debugging endpoint.
type PublicDebugAPI struct {
    eth *Ethereum
}

// NewPublicDebugAPI creates a new API definition for the full node-
// related public debug methods of the Ethereum service.
func NewPublicDebugAPI(eth *Ethereum) *PublicDebugAPI {
    return &PublicDebugAPI{eth: eth}
}

// DumpBlock retrieves the entire state of the database at a given block.
func (api *PublicDebugAPI) DumpBlock(number uint64) (state.Dump, error) {
    block := api.eth.BlockChain().GetBlockByNumber(number)
    if block == nil {
        return state.Dump{}, fmt.Errorf("block #%d not found", number)
    }
    stateDb, err := api.eth.BlockChain().StateAt(block.Root())
    if err != nil {
        return state.Dump{}, err
    }
    return stateDb.RawDump(), nil
}

// PrivateDebugAPI is the collection of Etheruem full node APIs exposed over
// the private debugging endpoint.
type PrivateDebugAPI struct {
    config *core.ChainConfig
    eth    *Ethereum
}

// NewPrivateDebugAPI creates a new API definition for the full node-related
// private debug methods of the Ethereum service.
func NewPrivateDebugAPI(config *core.ChainConfig, eth *Ethereum) *PrivateDebugAPI {
    return &PrivateDebugAPI{config: config, eth: eth}
}

// BlockTraceResult is the returned value when replaying a block to check for
// consensus results and full VM trace logs for all included transactions.
type BlockTraceResult struct {
    Validated  bool                  `json:"validated"`
    StructLogs []ethapi.StructLogRes `json:"structLogs"`
    Error      string                `json:"error"`
}

// TraceArgs holds extra parameters to trace functions
type TraceArgs struct {
    *vm.LogConfig
    Tracer  *string
    Timeout *string
}

// TraceBlock processes the given block's RLP but does not import the block in to
// the chain.
func (api *PrivateDebugAPI) TraceBlock(blockRlp []byte, config *vm.LogConfig) BlockTraceResult {
    var block types.Block
    err := rlp.Decode(bytes.NewReader(blockRlp), &block)
    if err != nil {
        return BlockTraceResult{Error: fmt.Sprintf("could not decode block: %v", err)}
    }

    validated, logs, err := api.traceBlock(&block, config)
    return BlockTraceResult{
        Validated:  validated,
        StructLogs: ethapi.FormatLogs(logs),
        Error:      formatError(err),
    }
}

// TraceBlockFromFile loads the block's RLP from the given file name and attempts to
// process it but does not import the block in to the chain.
func (api *PrivateDebugAPI) TraceBlockFromFile(file string, config *vm.LogConfig) BlockTraceResult {
    blockRlp, err := ioutil.ReadFile(file)
    if err != nil {
        return BlockTraceResult{Error: fmt.Sprintf("could not read file: %v", err)}
    }
    return api.TraceBlock(blockRlp, config)
}

// TraceBlockByNumber processes the block by canonical block number.
func (api *PrivateDebugAPI) TraceBlockByNumber(number uint64, config *vm.LogConfig) BlockTraceResult {
    // Fetch the block that we aim to reprocess
    block := api.eth.BlockChain().GetBlockByNumber(number)
    if block == nil {
        return BlockTraceResult{Error: fmt.Sprintf("block #%d not found", number)}
    }

    validated, logs, err := api.traceBlock(block, config)
    return BlockTraceResult{
        Validated:  validated,
        StructLogs: ethapi.FormatLogs(logs),
        Error:      formatError(err),
    }
}

// TraceBlockByHash processes the block by hash.
func (api *PrivateDebugAPI) TraceBlockByHash(hash common.Hash, config *vm.LogConfig) BlockTraceResult {
    // Fetch the block that we aim to reprocess
    block := api.eth.BlockChain().GetBlockByHash(hash)
    if block == nil {
        return BlockTraceResult{Error: fmt.Sprintf("block #%x not found", hash)}
    }

    validated, logs, err := api.traceBlock(block, config)
    return BlockTraceResult{
        Validated:  validated,
        StructLogs: ethapi.FormatLogs(logs),
        Error:      formatError(err),
    }
}

// traceBlock processes the given block but does not save the state.
func (api *PrivateDebugAPI) traceBlock(block *types.Block, logConfig *vm.LogConfig) (bool, []vm.StructLog, error) {
    // Validate and reprocess the block
    var (
        blockchain = api.eth.BlockChain()
        validator  = blockchain.Validator()
        processor  = blockchain.Processor()
    )

    structLogger := vm.NewStructLogger(logConfig)

    config := vm.Config{
        Debug:  true,
        Tracer: structLogger,
    }

    if err := core.ValidateHeader(api.config, blockchain.AuxValidator(), block.Header(), blockchain.GetHeader(block.ParentHash(), block.NumberU64()-1), true, false); err != nil {
        return false, structLogger.StructLogs(), err
    }
    statedb, err := blockchain.StateAt(blockchain.GetBlock(block.ParentHash(), block.NumberU64()-1).Root())
    if err != nil {
        return false, structLogger.StructLogs(), err
    }

    receipts, _, usedGas, err := processor.Process(block, statedb, config)
    if err != nil {
        return false, structLogger.StructLogs(), err
    }
    if err := validator.ValidateState(block, blockchain.GetBlock(block.ParentHash(), block.NumberU64()-1), statedb, receipts, usedGas); err != nil {
        return false, structLogger.StructLogs(), err
    }
    return true, structLogger.StructLogs(), nil
}

// callmsg is the message type used for call transations.
type callmsg struct {
    addr          common.Address
    to            *common.Address
    gas, gasPrice *big.Int
    value         *big.Int
    data          []byte
}

// accessor boilerplate to implement core.Message
func (m callmsg) From() (common.Address, error)         { return m.addr, nil }
func (m callmsg) FromFrontier() (common.Address, error) { return m.addr, nil }
func (m callmsg) Nonce() uint64                         { return 0 }
func (m callmsg) CheckNonce() bool                      { return false }
func (m callmsg) To() *common.Address                   { return m.to }
func (m callmsg) GasPrice() *big.Int                    { return m.gasPrice }
func (m callmsg) Gas() *big.Int                         { return m.gas }
func (m callmsg) Value() *big.Int                       { return m.value }
func (m callmsg) Data() []byte                          { return m.data }

// formatError formats a Go error into either an empty string or the data content
// of the error itself.
func formatError(err error) string {
    if err == nil {
        return ""
    }
    return err.Error()
}

type timeoutError struct{}

func (t *timeoutError) Error() string {
    return "Execution time exceeded"
}

// TraceTransaction returns the structured logs created during the execution of EVM
// and returns them as a JSON object.
func (api *PrivateDebugAPI) TraceTransaction(ctx context.Context, txHash common.Hash, config *TraceArgs) (interface{}, error) {
    var tracer vm.Tracer
    if config != nil && config.Tracer != nil {
        timeout := defaultTraceTimeout
        if config.Timeout != nil {
            var err error
            if timeout, err = time.ParseDuration(*config.Timeout); err != nil {
                return nil, err
            }
        }

        var err error
        if tracer, err = ethapi.NewJavascriptTracer(*config.Tracer); err != nil {
            return nil, err
        }

        // Handle timeouts and RPC cancellations
        deadlineCtx, cancel := context.WithTimeout(ctx, timeout)
        go func() {
            <-deadlineCtx.Done()
            tracer.(*ethapi.JavascriptTracer).Stop(&timeoutError{})
        }()
        defer cancel()
    } else if config == nil {
        tracer = vm.NewStructLogger(nil)
    } else {
        tracer = vm.NewStructLogger(config.LogConfig)
    }

    // Retrieve the tx from the chain and the containing block
    tx, blockHash, _, txIndex := core.GetTransaction(api.eth.ChainDb(), txHash)
    if tx == nil {
        return nil, fmt.Errorf("transaction %x not found", txHash)
    }
    block := api.eth.BlockChain().GetBlockByHash(blockHash)
    if block == nil {
        return nil, fmt.Errorf("block %x not found", blockHash)
    }
    // Create the state database to mutate and eventually trace
    parent := api.eth.BlockChain().GetBlock(block.ParentHash(), block.NumberU64()-1)
    if parent == nil {
        return nil, fmt.Errorf("block parent %x not found", block.ParentHash())
    }
    stateDb, err := api.eth.BlockChain().StateAt(parent.Root())
    if err != nil {
        return nil, err
    }
    // Mutate the state and trace the selected transaction
    for idx, tx := range block.Transactions() {
        // Assemble the transaction call message
        from, err := tx.FromFrontier()
        if err != nil {
            return nil, fmt.Errorf("sender retrieval failed: %v", err)
        }
        msg := callmsg{
            addr:     from,
            to:       tx.To(),
            gas:      tx.Gas(),
            gasPrice: tx.GasPrice(),
            value:    tx.Value(),
            data:     tx.Data(),
        }
        // Mutate the state if we haven't reached the tracing transaction yet
        if uint64(idx) < txIndex {
            vmenv := core.NewEnv(stateDb, api.config, api.eth.BlockChain(), msg, block.Header(), vm.Config{})
            _, _, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(tx.Gas()))
            if err != nil {
                return nil, fmt.Errorf("mutation failed: %v", err)
            }
            stateDb.DeleteSuicides()
            continue
        }
        // Otherwise trace the transaction and return
        vmenv := core.NewEnv(stateDb, api.config, api.eth.BlockChain(), msg, block.Header(), vm.Config{Debug: true, Tracer: tracer})
        ret, gas, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(tx.Gas()))
        if err != nil {
            return nil, fmt.Errorf("tracing failed: %v", err)
        }

        switch tracer := tracer.(type) {
        case *vm.StructLogger:
            return &ethapi.ExecutionResult{
                Gas:         gas,
                ReturnValue: fmt.Sprintf("%x", ret),
                StructLogs:  ethapi.FormatLogs(tracer.StructLogs()),
            }, nil
        case *ethapi.JavascriptTracer:
            return tracer.GetResult()
        }
    }
    return nil, errors.New("database inconsistency")
}