aboutsummaryrefslogtreecommitdiffstats
path: root/app/scripts/controllers/transactions.js
blob: 7f313054073953c35528fd34792248970d857abd (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
const EventEmitter = require('events')
const ObservableStore = require('obs-store')
const ethUtil = require('ethereumjs-util')
const Transaction = require('ethereumjs-tx')
const EthQuery = require('ethjs-query')
const TransactionStateManger = require('../lib/tx-state-manager')
const TxGasUtil = require('../lib/tx-gas-utils')
const PendingTransactionTracker = require('../lib/pending-tx-tracker')
const createId = require('../lib/random-id')
const NonceTracker = require('../lib/nonce-tracker')

/*
  Transaction Controller is an aggregate of sub-controllers and trackers
  composing them in a way to be exposed to the metamask controller
    - txStateManager
      responsible for the state of a transaction and
      storing the transaction
    - pendingTxTracker
      watching blocks for transactions to be include
      and emitting confirmed events
    - txGasUtil
      gas calculations and safety buffering
    - nonceTracker
      calculating nonces
*/

module.exports = class TransactionController extends EventEmitter {
  constructor (opts) {
    super()
    this.networkStore = opts.networkStore || new ObservableStore({})
    this.preferencesStore = opts.preferencesStore || new ObservableStore({})
    this.provider = opts.provider
    this.blockTracker = opts.blockTracker
    this.signEthTx = opts.signTransaction

    this.memStore = new ObservableStore({})
    this.query = new EthQuery(this.provider)
    this.txGasUtil = new TxGasUtil(this.provider)

    this.txStateManager = new TransactionStateManger({
      initState: opts.initState,
      txHistoryLimit: opts.txHistoryLimit,
      getNetwork: this.getNetwork.bind(this),
    })
    this.store = this.txStateManager.store
    this.txStateManager.on('tx:status-update', this.emit.bind(this, 'tx:status-update'))
    this.nonceTracker = new NonceTracker({
      provider: this.provider,
      getPendingTransactions: this.txStateManager.getPendingTransactions.bind(this.txStateManager),
      getConfirmedTransactions: (address) => {
        return this.txStateManager.getFilteredTxList({
          from: address,
          status: 'confirmed',
          err: undefined,
        })
      },
    })

    this.pendingTxTracker = new PendingTransactionTracker({
      provider: this.provider,
      nonceTracker: this.nonceTracker,
      publishTransaction: (rawTx) => this.query.sendRawTransaction(rawTx),
      getPendingTransactions: this.txStateManager.getPendingTransactions.bind(this.txStateManager),
      getCompletedTransactions: this.txStateManager.getConfirmedTransactions.bind(this.txStateManager),
    })

    this.txStateManager.store.subscribe(() => this.emit('update:badge'))

    this.pendingTxTracker.on('tx:warning', (txMeta) => {
      this.txStateManager.updateTx(txMeta, 'transactions/pending-tx-tracker#event: tx:warning')
    })
    this.pendingTxTracker.on('tx:failed', this.txStateManager.setTxStatusFailed.bind(this.txStateManager))
    this.pendingTxTracker.on('tx:confirmed', this.txStateManager.setTxStatusConfirmed.bind(this.txStateManager))
    this.pendingTxTracker.on('tx:block-update', (txMeta, latestBlockNumber) => {
      if (!txMeta.firstRetryBlockNumber) {
        txMeta.firstRetryBlockNumber = latestBlockNumber
        this.txStateManager.updateTx(txMeta, 'transactions/pending-tx-tracker#event: tx:block-update')
      }
    })
    this.pendingTxTracker.on('tx:retry', (txMeta) => {
      if (!('retryCount' in txMeta)) txMeta.retryCount = 0
      txMeta.retryCount++
      this.txStateManager.updateTx(txMeta, 'transactions/pending-tx-tracker#event: tx:retry')
    })

    this.blockTracker.on('block', this.pendingTxTracker.checkForTxInBlock.bind(this.pendingTxTracker))
    // this is a little messy but until ethstore has been either
    // removed or redone this is to guard against the race condition
    this.blockTracker.on('latest', this.pendingTxTracker.resubmitPendingTxs.bind(this.pendingTxTracker))
    this.blockTracker.on('sync', this.pendingTxTracker.queryPendingTxs.bind(this.pendingTxTracker))
    // memstore is computed from a few different stores
    this._updateMemstore()
    this.txStateManager.store.subscribe(() => this._updateMemstore())
    this.networkStore.subscribe(() => this._updateMemstore())
    this.preferencesStore.subscribe(() => this._updateMemstore())
  }

  getState () {
    return this.memStore.getState()
  }

  getNetwork () {
    return this.networkStore.getState()
  }

  getSelectedAddress () {
    return this.preferencesStore.getState().selectedAddress
  }

  getUnapprovedTxCount () {
    return Object.keys(this.txStateManager.getUnapprovedTxList()).length
  }

  getPendingTxCount (account) {
    return this.txStateManager.getPendingTransactions(account).length
  }

  getFilteredTxList (opts) {
    return this.txStateManager.getFilteredTxList(opts)
  }

  getChainId () {
    const networkState = this.networkStore.getState()
    const getChainId = parseInt(networkState)
    if (Number.isNaN(getChainId)) {
      return 0
    } else {
      return getChainId
    }
  }

  // Adds a tx to the txlist
  addTx (txMeta) {
    this.txStateManager.addTx(txMeta)
    this.emit(`${txMeta.id}:unapproved`, txMeta)
  }

  async newUnapprovedTransaction (txParams) {
    log.debug(`MetaMaskController newUnapprovedTransaction ${JSON.stringify(txParams)}`)
    const initialTxMeta = await this.addUnapprovedTransaction(txParams)
    this.emit('newUnapprovedTx', initialTxMeta)
    // listen for tx completion (success, fail)
    return new Promise((resolve, reject) => {
      this.txStateManager.once(`${initialTxMeta.id}:finished`, (finishedTxMeta) => {
        switch (finishedTxMeta.status) {
          case 'submitted':
            return resolve(finishedTxMeta.hash)
          case 'rejected':
            return reject(new Error('MetaMask Tx Signature: User denied transaction signature.'))
          case 'failed':
            return reject(new Error(finishedTxMeta.err.message))
          default:
            return reject(new Error(`MetaMask Tx Signature: Unknown problem: ${JSON.stringify(finishedTxMeta.txParams)}`))
        }
      })
    })
  }

  async addUnapprovedTransaction (txParams) {
    // validate
    await this.txGasUtil.validateTxParams(txParams)
    // construct txMeta
    const txMeta = {
      id: createId(),
      time: (new Date()).getTime(),
      status: 'unapproved',
      metamaskNetworkId: this.getNetwork(),
      txParams: txParams,
    }
    // add default tx params
    await this.addTxDefaults(txMeta)
    // save txMeta
    this.addTx(txMeta)
    return txMeta
  }

  async addTxDefaults (txMeta) {
    const txParams = txMeta.txParams
    // ensure value
    txMeta.gasPriceSpecified = Boolean(txParams.gasPrice)
    txMeta.nonceSpecified = Boolean(txParams.nonce)
    const gasPrice = txParams.gasPrice || await this.query.gasPrice()
    txParams.gasPrice = ethUtil.addHexPrefix(gasPrice.toString(16))
    txParams.value = txParams.value || '0x0'
    // set gasLimit
    return await this.txGasUtil.analyzeGasUsage(txMeta)
  }

  async retryTransaction (txId) {
    this.txStateManager.setTxStatusUnapproved(txId)
    const txMeta = this.txStateManager.getTx(txId)
    txMeta.lastGasPrice = txMeta.txParams.gasPrice
    this.txStateManager.updateTx(txMeta, 'retryTransaction: manual retry')
  }

  async updateTransaction (txMeta) {
    this.txStateManager.updateTx(txMeta, 'confTx: user updated transaction')
  }

  async updateAndApproveTransaction (txMeta) {
    this.txStateManager.updateTx(txMeta, 'confTx: user approved transaction')
    await this.approveTransaction(txMeta.id)
  }

  async approveTransaction (txId) {
    let nonceLock
    try {
      // approve
      this.txStateManager.setTxStatusApproved(txId)
      // get next nonce
      const txMeta = this.txStateManager.getTx(txId)
      const fromAddress = txMeta.txParams.from
      // wait for a nonce
      nonceLock = await this.nonceTracker.getNonceLock(fromAddress)
      // add nonce to txParams
      const nonce = txMeta.nonceSpecified ? txMeta.txParams.nonce : nonceLock.nextNonce
      if (nonce > nonceLock.nextNonce) {
        const message = `Specified nonce may not be larger than account's next valid nonce.`
        throw new Error(message)
      }
      txMeta.txParams.nonce = ethUtil.addHexPrefix(nonce.toString(16))
      // add nonce debugging information to txMeta
      txMeta.nonceDetails = nonceLock.nonceDetails
      this.txStateManager.updateTx(txMeta, 'transactions#approveTransaction')
      // sign transaction
      const rawTx = await this.signTransaction(txId)
      await this.publishTransaction(txId, rawTx)
      // must set transaction to submitted/failed before releasing lock
      nonceLock.releaseLock()
    } catch (err) {
      this.txStateManager.setTxStatusFailed(txId, err)
      // must set transaction to submitted/failed before releasing lock
      if (nonceLock) nonceLock.releaseLock()
      // continue with error chain
      throw err
    }
  }

  async signTransaction (txId) {
    const txMeta = this.txStateManager.getTx(txId)
    const txParams = txMeta.txParams
    const fromAddress = txParams.from
    // add network/chain id
    txParams.chainId = ethUtil.addHexPrefix(this.getChainId().toString(16))
    const ethTx = new Transaction(txParams)
    await this.signEthTx(ethTx, fromAddress)
    this.txStateManager.setTxStatusSigned(txMeta.id)
    const rawTx = ethUtil.bufferToHex(ethTx.serialize())
    return rawTx
  }

  async publishTransaction (txId, rawTx) {
    const txMeta = this.txStateManager.getTx(txId)
    txMeta.rawTx = rawTx
    this.txStateManager.updateTx(txMeta, 'transactions#publishTransaction')
    const txHash = await this.query.sendRawTransaction(rawTx)
    this.setTxHash(txId, txHash)
    this.txStateManager.setTxStatusSubmitted(txId)
  }

  async cancelTransaction (txId) {
    this.txStateManager.setTxStatusRejected(txId)
  }

  // receives a txHash records the tx as signed
  setTxHash (txId, txHash) {
    // Add the tx hash to the persisted meta-tx object
    const txMeta = this.txStateManager.getTx(txId)
    txMeta.hash = txHash
    this.txStateManager.updateTx(txMeta, 'transactions#setTxHash')
  }

//
//           PRIVATE METHODS
//

  _updateMemstore () {
    const unapprovedTxs = this.txStateManager.getUnapprovedTxList()
    const selectedAddressTxList = this.txStateManager.getFilteredTxList({
      from: this.getSelectedAddress(),
      metamaskNetworkId: this.getNetwork(),
    })
    this.memStore.updateState({ unapprovedTxs, selectedAddressTxList })
  }
}