Merge branch 'master' into mmn

7 files changed, 444 insertions, 175 deletions

diff --git a/app/scripts/lib/account-tracker.js b/app/scripts/lib/account-tracker.js
new file mode 100644
index 000000000..cdc21282d
--- /dev/null
+++ b/app/scripts/lib/account-tracker.js
@@ -0,0 +1,104 @@
+/* Account Tracker
+ *
+ * This module is responsible for tracking any number of accounts
+ * and caching their current balances & transaction counts.
+ *
+ * It also tracks transaction hashes, and checks their inclusion status
+ * on each new block.
+ */
+
+const async = require('async')
+const EthQuery = require('eth-query')
+const ObservableStore = require('obs-store')
+const EventEmitter = require('events').EventEmitter
+function noop () {}
+
+
+class AccountTracker extends EventEmitter {
+
+  constructor (opts = {}) {
+    super()
+
+    const initState = {
+      accounts: {},
+      currentBlockGasLimit: '',
+    }
+    this.store = new ObservableStore(initState)
+
+    this._provider = opts.provider
+    this._query = new EthQuery(this._provider)
+    this._blockTracker = opts.blockTracker
+    // subscribe to latest block
+    this._blockTracker.on('block', this._updateForBlock.bind(this))
+    // blockTracker.currentBlock may be null
+    this._currentBlockNumber = this._blockTracker.currentBlock
+  }
+
+  //
+  // public
+  //
+
+  addAccount (address) {
+    const accounts = this.store.getState().accounts
+    accounts[address] = {}
+    this.store.updateState({ accounts })
+    if (!this._currentBlockNumber) return
+    this._updateAccount(address)
+  }
+
+  removeAccount (address) {
+    const accounts = this.store.getState().accounts
+    delete accounts[address]
+    this.store.updateState({ accounts })
+  }
+
+  //
+  // private
+  //
+
+  _updateForBlock (block) {
+    this._currentBlockNumber = block.number
+    const currentBlockGasLimit = block.gasLimit
+
+    this.store.updateState({ currentBlockGasLimit })
+
+    async.parallel([
+      this._updateAccounts.bind(this),
+    ], (err) => {
+      if (err) return console.error(err)
+      this.emit('block', this.store.getState())
+    })
+  }
+
+  _updateAccounts (cb = noop) {
+    const accounts = this.store.getState().accounts
+    const addresses = Object.keys(accounts)
+    async.each(addresses, this._updateAccount.bind(this), cb)
+  }
+
+  _updateAccount (address, cb = noop) {
+    this._getAccount(address, (err, result) => {
+      if (err) return cb(err)
+      result.address = address
+      const accounts = this.store.getState().accounts
+      // only populate if the entry is still present
+      if (accounts[address]) {
+        accounts[address] = result
+        this.store.updateState({ accounts })
+      }
+      cb(null, result)
+    })
+  }
+
+  _getAccount (address, cb = noop) {
+    const query = this._query
+    async.parallel({
+      balance: query.getBalance.bind(query, address),
+      nonce: query.getTransactionCount.bind(query, address),
+      code: query.getCode.bind(query, address),
+    }, cb)
+  }
+
+}
+
+module.exports = AccountTracker
diff --git a/app/scripts/lib/eth-store.js b/app/scripts/lib/eth-store.js
deleted file mode 100644
index ebba98f5c..000000000
--- a/app/scripts/lib/eth-store.js
+++ /dev/null
@@ -1,138 +0,0 @@
-/* Ethereum Store
- *
- * This module is responsible for tracking any number of accounts
- * and caching their current balances & transaction counts.
- *
- * It also tracks transaction hashes, and checks their inclusion status
- * on each new block.
- */
-
-const async = require('async')
-const EthQuery = require('eth-query')
-const ObservableStore = require('obs-store')
-function noop () {}
-
-
-class EthereumStore extends ObservableStore {
-
-  constructor (opts = {}) {
-    super({
-      accounts: {},
-      transactions: {},
-      currentBlockNumber: '0',
-      currentBlockHash: '',
-      currentBlockGasLimit: '',
-    })
-    this._provider = opts.provider
-    this._query = new EthQuery(this._provider)
-    this._blockTracker = opts.blockTracker
-    // subscribe to latest block
-    this._blockTracker.on('block', this._updateForBlock.bind(this))
-    // blockTracker.currentBlock may be null
-    this._currentBlockNumber = this._blockTracker.currentBlock
-  }
-
-  //
-  // public
-  //
-
-  addAccount (address) {
-    const accounts = this.getState().accounts
-    accounts[address] = {}
-    this.updateState({ accounts })
-    if (!this._currentBlockNumber) return
-    this._updateAccount(address)
-  }
-
-  removeAccount (address) {
-    const accounts = this.getState().accounts
-    delete accounts[address]
-    this.updateState({ accounts })
-  }
-
-  addTransaction (txHash) {
-    const transactions = this.getState().transactions
-    transactions[txHash] = {}
-    this.updateState({ transactions })
-    if (!this._currentBlockNumber) return
-    this._updateTransaction(this._currentBlockNumber, txHash, noop)
-  }
-
-  removeTransaction (txHash) {
-    const transactions = this.getState().transactions
-    delete transactions[txHash]
-    this.updateState({ transactions })
-  }
-
-
-  //
-  // private
-  //
-
-  _updateForBlock (block) {
-    const blockNumber = '0x' + block.number.toString('hex')
-    this._currentBlockNumber = blockNumber
-    this.updateState({ currentBlockNumber: parseInt(blockNumber) })
-    this.updateState({ currentBlockHash: `0x${block.hash.toString('hex')}`})
-    this.updateState({ currentBlockGasLimit: `0x${block.gasLimit.toString('hex')}` })
-    async.parallel([
-      this._updateAccounts.bind(this),
-      this._updateTransactions.bind(this, blockNumber),
-    ], (err) => {
-      if (err) return console.error(err)
-      this.emit('block', this.getState())
-    })
-  }
-
-  _updateAccounts (cb = noop) {
-    const accounts = this.getState().accounts
-    const addresses = Object.keys(accounts)
-    async.each(addresses, this._updateAccount.bind(this), cb)
-  }
-
-  _updateAccount (address, cb = noop) {
-    const accounts = this.getState().accounts
-    this._getAccount(address, (err, result) => {
-      if (err) return cb(err)
-      result.address = address
-      // only populate if the entry is still present
-      if (accounts[address]) {
-        accounts[address] = result
-        this.updateState({ accounts })
-      }
-      cb(null, result)
-    })
-  }
-
-  _updateTransactions (block, cb = noop) {
-    const transactions = this.getState().transactions
-    const txHashes = Object.keys(transactions)
-    async.each(txHashes, this._updateTransaction.bind(this, block), cb)
-  }
-
-  _updateTransaction (block, txHash, cb = noop) {
-    // would use the block here to determine how many confirmations the tx has
-    const transactions = this.getState().transactions
-    this._query.getTransaction(txHash, (err, result) => {
-      if (err) return cb(err)
-      // only populate if the entry is still present
-      if (transactions[txHash]) {
-        transactions[txHash] = result
-        this.updateState({ transactions })
-      }
-      cb(null, result)
-    })
-  }
-
-  _getAccount (address, cb = noop) {
-    const query = this._query
-    async.parallel({
-      balance: query.getBalance.bind(query, address),
-      nonce: query.getTransactionCount.bind(query, address),
-      code: query.getCode.bind(query, address),
-    }, cb)
-  }
-
-}
-
-module.exports = EthereumStore
diff --git a/app/scripts/lib/events-proxy.js b/app/scripts/lib/events-proxy.js
new file mode 100644
index 000000000..d1199a278
--- /dev/null
+++ b/app/scripts/lib/events-proxy.js
@@ -0,0 +1,31 @@
+module.exports = function createEventEmitterProxy(eventEmitter, listeners) {
+  let target = eventEmitter
+  const eventHandlers = listeners || {}
+  const proxy = new Proxy({}, {
+    get: (obj, name) => {
+      // intercept listeners
+      if (name === 'on') return addListener
+      if (name === 'setTarget') return setTarget
+      if (name === 'proxyEventHandlers') return eventHandlers
+      return target[name]
+    },
+    set: (obj, name, value) => {
+      target[name] = value
+      return true
+    },
+  })
+  function setTarget (eventEmitter) {
+    target = eventEmitter
+    // migrate listeners
+    Object.keys(eventHandlers).forEach((name) => {
+      eventHandlers[name].forEach((handler) => target.on(name, handler))
+    })
+  }
+  function addListener (name, handler) {
+    if (!eventHandlers[name]) eventHandlers[name] = []
+    eventHandlers[name].push(handler)
+    target.on(name, handler)
+  }
+  if (listeners) proxy.setTarget(eventEmitter)
+  return proxy
+}
\ No newline at end of file
diff --git a/app/scripts/lib/pending-balance-calculator.js b/app/scripts/lib/pending-balance-calculator.js
new file mode 100644
index 000000000..cea642f1a
--- /dev/null
+++ b/app/scripts/lib/pending-balance-calculator.js
@@ -0,0 +1,51 @@
+const BN = require('ethereumjs-util').BN
+const normalize = require('eth-sig-util').normalize
+
+class PendingBalanceCalculator {
+
+  // Must be initialized with two functions:
+  // getBalance => Returns a promise of a BN of the current balance in Wei
+  // getPendingTransactions => Returns an array of TxMeta Objects,
+  // which have txParams properties, which include value, gasPrice, and gas,
+  // all in a base=16 hex format.
+  constructor ({ getBalance, getPendingTransactions }) {
+    this.getPendingTransactions = getPendingTransactions
+    this.getNetworkBalance = getBalance
+  }
+
+  async getBalance() {
+    const results = await Promise.all([
+      this.getNetworkBalance(),
+      this.getPendingTransactions(),
+    ])
+
+    const [ balance, pending ] = results
+    if (!balance) return undefined
+
+    const pendingValue = pending.reduce((total, tx) => {
+      return total.add(this.calculateMaxCost(tx))
+    }, new BN(0))
+
+    return `0x${balance.sub(pendingValue).toString(16)}`
+  }
+
+  calculateMaxCost (tx) {
+    const txValue = tx.txParams.value
+    const value = this.hexToBn(txValue)
+    const gasPrice = this.hexToBn(tx.txParams.gasPrice)
+
+    const gas = tx.txParams.gas
+    const gasLimit = tx.txParams.gasLimit
+    const gasLimitBn = this.hexToBn(gas || gasLimit)
+
+    const gasCost = gasPrice.mul(gasLimitBn)
+    return value.add(gasCost)
+  }
+
+  hexToBn (hex) {
+    return new BN(normalize(hex).substring(2), 16)
+  }
+
+}
+
+module.exports = PendingBalanceCalculator
diff --git a/app/scripts/lib/pending-tx-tracker.js b/app/scripts/lib/pending-tx-tracker.js
index 44e9d50fa..b97cec9ce 100644
--- a/app/scripts/lib/pending-tx-tracker.js
+++ b/app/scripts/lib/pending-tx-tracker.js
@@ -1,7 +1,6 @@
 const EventEmitter = require('events')
 const EthQuery = require('ethjs-query')
 const sufficientBalance = require('./util').sufficientBalance
-const RETRY_LIMIT = 3500 // Retry 3500 blocks, or about 1 day.
 /*
 
   Utility class for tracking the transactions as they
@@ -25,11 +24,10 @@ module.exports = class PendingTransactionTracker extends EventEmitter {
     super()
     this.query = new EthQuery(config.provider)
     this.nonceTracker = config.nonceTracker
-
+    this.retryLimit = config.retryLimit || Infinity
     this.getBalance = config.getBalance
     this.getPendingTransactions = config.getPendingTransactions
     this.publishTransaction = config.publishTransaction
-    this.giveUpOnTransaction = config.giveUpOnTransaction
   }
 
   //  checks if a signed tx is in a block and
@@ -44,18 +42,18 @@ module.exports = class PendingTransactionTracker extends EventEmitter {
       if (!txHash) {
         const noTxHashErr = new Error('We had an error while submitting this transaction, please try again.')
         noTxHashErr.name = 'NoTxHashError'
-        this.emit('txFailed', txId, noTxHashErr)
+        this.emit('tx:failed', txId, noTxHashErr)
         return
       }
 
 
       block.transactions.forEach((tx) => {
-        if (tx.hash === txHash) this.emit('txConfirmed', txId)
+        if (tx.hash === txHash) this.emit('tx:confirmed', txId)
       })
     })
   }
 
-  queryPendingTxs ({oldBlock, newBlock}) {
+  queryPendingTxs ({ oldBlock, newBlock }) {
     // check pending transactions on start
     if (!oldBlock) {
       this._checkPendingTxs()
@@ -96,7 +94,7 @@ module.exports = class PendingTransactionTracker extends EventEmitter {
       // ignore resubmit warnings, return early
       if (isKnownTx) return
       // encountered real error - transition to error state
-      this.emit('txFailed', txMeta.id, err)
+      this.emit('tx:failed', txMeta.id, err)
     }))
   }
 
@@ -104,16 +102,16 @@ module.exports = class PendingTransactionTracker extends EventEmitter {
     const address = txMeta.txParams.from
     const balance = this.getBalance(address)
     if (balance === undefined) return
-    if (!('retryCount' in txMeta)) txMeta.retryCount = 0
 
-    if (txMeta.retryCount > RETRY_LIMIT) {
-      return this.giveUpOnTransaction(txMeta.id)
+    if (txMeta.retryCount > this.retryLimit) {
+      const err = new Error(`Gave up submitting after ${this.retryLimit} blocks un-mined.`)
+      return this.emit('tx:failed', txMeta.id, err)
     }
 
     // if the value of the transaction is greater then the balance, fail.
     if (!sufficientBalance(txMeta.txParams, balance)) {
       const insufficientFundsError = new Error('Insufficient balance during rebroadcast.')
-      this.emit('txFailed', txMeta.id, insufficientFundsError)
+      this.emit('tx:failed', txMeta.id, insufficientFundsError)
       log.error(insufficientFundsError)
       return
     }
@@ -125,7 +123,7 @@ module.exports = class PendingTransactionTracker extends EventEmitter {
     const txHash = await this.publishTransaction(rawTx)
 
     // Increment successful tries:
-    txMeta.retryCount++
+    this.emit('tx:retry', txMeta)
     return txHash
   }
 
@@ -137,7 +135,7 @@ module.exports = class PendingTransactionTracker extends EventEmitter {
     if (!txHash) {
       const noTxHashErr = new Error('We had an error while submitting this transaction, please try again.')
       noTxHashErr.name = 'NoTxHashError'
-      this.emit('txFailed', txId, noTxHashErr)
+      this.emit('tx:failed', txId, noTxHashErr)
       return
     }
     // get latest transaction status
@@ -146,14 +144,14 @@ module.exports = class PendingTransactionTracker extends EventEmitter {
       txParams = await this.query.getTransactionByHash(txHash)
       if (!txParams) return
       if (txParams.blockNumber) {
-        this.emit('txConfirmed', txId)
+        this.emit('tx:confirmed', txId)
       }
     } catch (err) {
       txMeta.warning = {
         error: err,
         message: 'There was a problem loading this transaction.',
       }
-      this.emit('txWarning', txMeta)
+      this.emit('tx:warning', txMeta)
       throw err
     }
   }
diff --git a/app/scripts/lib/tx-utils.js b/app/scripts/lib/tx-gas-utils.js
index 5af078dc4..41f67e230 100644
--- a/app/scripts/lib/tx-utils.js
+++ b/app/scripts/lib/tx-gas-utils.js
@@ -1,6 +1,4 @@
 const EthQuery = require('ethjs-query')
-const Transaction = require('ethereumjs-tx')
-const normalize = require('eth-sig-util').normalize
 const {
   hexToBn,
   BnMultiplyByFraction,
@@ -78,26 +76,6 @@ module.exports = class txProvideUtil {
     return bnToHex(upperGasLimitBn)
   }
 
-  // builds ethTx from txParams object
-  buildEthTxFromParams (txParams) {
-    // normalize values
-    txParams.to = normalize(txParams.to)
-    txParams.from = normalize(txParams.from)
-    txParams.value = normalize(txParams.value)
-    txParams.data = normalize(txParams.data)
-    txParams.gas = normalize(txParams.gas || txParams.gasLimit)
-    txParams.gasPrice = normalize(txParams.gasPrice)
-    txParams.nonce = normalize(txParams.nonce)
-    // build ethTx
-    log.info(`Prepared tx for signing: ${JSON.stringify(txParams)}`)
-    const ethTx = new Transaction(txParams)
-    return ethTx
-  }
-
-  async publishTransaction (rawTx) {
-    return await this.query.sendRawTransaction(rawTx)
-  }
-
   async validateTxParams (txParams) {
     if (('value' in txParams) && txParams.value.indexOf('-') === 0) {
       throw new Error(`Invalid transaction value of ${txParams.value} not a positive number.`)
diff --git a/app/scripts/lib/tx-state-manager.js b/app/scripts/lib/tx-state-manager.js
new file mode 100644
index 000000000..abb9d7910
--- /dev/null
+++ b/app/scripts/lib/tx-state-manager.js
@@ -0,0 +1,245 @@
+const extend = require('xtend')
+const EventEmitter = require('events')
+const ObservableStore = require('obs-store')
+const ethUtil = require('ethereumjs-util')
+const txStateHistoryHelper = require('./tx-state-history-helper')
+
+module.exports = class TransactionStateManger extends EventEmitter {
+  constructor ({ initState, txHistoryLimit, getNetwork }) {
+    super()
+
+    this.store = new ObservableStore(
+      extend({
+        transactions: [],
+    }, initState))
+    this.txHistoryLimit = txHistoryLimit
+    this.getNetwork = getNetwork
+  }
+
+  // Returns the number of txs for the current network.
+  getTxCount () {
+    return this.getTxList().length
+  }
+
+  getTxList () {
+    const network = this.getNetwork()
+    const fullTxList = this.getFullTxList()
+    return fullTxList.filter((txMeta) => txMeta.metamaskNetworkId === network)
+  }
+
+  getFullTxList () {
+    return this.store.getState().transactions
+  }
+
+  // Returns the tx list
+  getUnapprovedTxList () {
+    const txList = this.getTxsByMetaData('status', 'unapproved')
+    return txList.reduce((result, tx) => {
+      result[tx.id] = tx
+      return result
+    }, {})
+  }
+
+  getPendingTransactions (address) {
+    const opts = { status: 'submitted' }
+    if (address) opts.from = address
+    return this.getFilteredTxList(opts)
+  }
+
+  addTx (txMeta) {
+    this.once(`${txMeta.id}:signed`, function (txId) {
+      this.removeAllListeners(`${txMeta.id}:rejected`)
+    })
+    this.once(`${txMeta.id}:rejected`, function (txId) {
+      this.removeAllListeners(`${txMeta.id}:signed`)
+    })
+    // initialize history
+    txMeta.history = []
+    // capture initial snapshot of txMeta for history
+    const snapshot = txStateHistoryHelper.snapshotFromTxMeta(txMeta)
+    txMeta.history.push(snapshot)
+
+    const transactions = this.getFullTxList()
+    const txCount = this.getTxCount()
+    const txHistoryLimit = this.txHistoryLimit
+
+    // checks if the length of the tx history is
+    // longer then desired persistence limit
+    // and then if it is removes only confirmed
+    // or rejected tx's.
+    // not tx's that are pending or unapproved
+    if (txCount > txHistoryLimit - 1) {
+      const index = transactions.findIndex((metaTx) => metaTx.status === 'confirmed' || metaTx.status === 'rejected')
+      transactions.splice(index, 1)
+    }
+    transactions.push(txMeta)
+    this._saveTxList(transactions)
+    return txMeta
+  }
+  // gets tx by Id and returns it
+  getTx (txId) {
+    const txMeta = this.getTxsByMetaData('id', txId)[0]
+    return txMeta
+  }
+
+  updateTx (txMeta) {
+    if (txMeta.txParams) {
+      Object.keys(txMeta.txParams).forEach((key) => {
+        let value = txMeta.txParams[key]
+        if (typeof value !== 'string') console.error(`${key}: ${value} in txParams is not a string`)
+        if (!ethUtil.isHexPrefixed(value)) console.error('is not hex prefixed, anything on txParams must be hex prefixed')
+      })
+    }
+
+    // create txMeta snapshot for history
+    const currentState = txStateHistoryHelper.snapshotFromTxMeta(txMeta)
+    // recover previous tx state obj
+    const previousState = txStateHistoryHelper.replayHistory(txMeta.history)
+    // generate history entry and add to history
+    const entry = txStateHistoryHelper.generateHistoryEntry(previousState, currentState)
+   txMeta.history.push(entry)
+
+    // commit txMeta to state
+    const txId = txMeta.id
+    const txList = this.getFullTxList()
+    const index = txList.findIndex(txData => txData.id === txId)
+    txList[index] = txMeta
+    this._saveTxList(txList)
+  }
+
+
+  // merges txParams obj onto txData.txParams
+  // use extend to ensure that all fields are filled
+  updateTxParams (txId, txParams) {
+    const txMeta = this.getTx(txId)
+    txMeta.txParams = extend(txMeta.txParams, txParams)
+    this.updateTx(txMeta)
+  }
+
+/*
+  Takes an object of fields to search for eg:
+  let thingsToLookFor = {
+    to: '0x0..',
+    from: '0x0..',
+    status: 'signed',
+    err: undefined,
+  }
+  and returns a list of tx with all
+  options matching
+
+  ****************HINT****************
+  | `err: undefined` is like looking |
+  | for a tx with no err             |
+  | so you can also search txs that  |
+  | dont have something as well by   |
+  | setting the value as undefined   |
+  ************************************
+
+  this is for things like filtering a the tx list
+  for only tx's from 1 account
+  or for filltering for all txs from one account
+  and that have been 'confirmed'
+  */
+  getFilteredTxList (opts, initialList) {
+    let filteredTxList = initialList
+    Object.keys(opts).forEach((key) => {
+      filteredTxList = this.getTxsByMetaData(key, opts[key], filteredTxList)
+    })
+    return filteredTxList
+  }
+
+  getTxsByMetaData (key, value, txList = this.getTxList()) {
+    return txList.filter((txMeta) => {
+      if (txMeta.txParams[key]) {
+        return txMeta.txParams[key] === value
+      } else {
+        return txMeta[key] === value
+      }
+    })
+  }
+
+  // STATUS METHODS
+  // statuses:
+  //    - `'unapproved'` the user has not responded
+  //    - `'rejected'` the user has responded no!
+  //    - `'approved'` the user has approved the tx
+  //    - `'signed'` the tx is signed
+  //    - `'submitted'` the tx is sent to a server
+  //    - `'confirmed'` the tx has been included in a block.
+  //    - `'failed'` the tx failed for some reason, included on tx data.
+
+  // get::set status
+
+  // should return the status of the tx.
+  getTxStatus (txId) {
+    const txMeta = this.getTx(txId)
+    return txMeta.status
+  }
+
+  // should update the status of the tx to 'rejected'.
+  setTxStatusRejected (txId) {
+    this._setTxStatus(txId, 'rejected')
+  }
+
+  // should update the status of the tx to 'approved'.
+  setTxStatusApproved (txId) {
+    this._setTxStatus(txId, 'approved')
+  }
+
+  // should update the status of the tx to 'signed'.
+  setTxStatusSigned (txId) {
+    this._setTxStatus(txId, 'signed')
+  }
+
+  // should update the status of the tx to 'submitted'.
+  setTxStatusSubmitted (txId) {
+    this._setTxStatus(txId, 'submitted')
+  }
+
+  // should update the status of the tx to 'confirmed'.
+  setTxStatusConfirmed (txId) {
+    this._setTxStatus(txId, 'confirmed')
+  }
+
+  setTxStatusFailed (txId, err) {
+    const txMeta = this.getTx(txId)
+    txMeta.err = {
+      message: err.toString(),
+      stack: err.stack,
+    }
+    this.updateTx(txMeta)
+    this._setTxStatus(txId, 'failed')
+  }
+
+//
+//           PRIVATE METHODS
+//
+
+  //  Should find the tx in the tx list and
+  //  update it.
+  //  should set the status in txData
+  //    - `'unapproved'` the user has not responded
+  //    - `'rejected'` the user has responded no!
+  //    - `'approved'` the user has approved the tx
+  //    - `'signed'` the tx is signed
+  //    - `'submitted'` the tx is sent to a server
+  //    - `'confirmed'` the tx has been included in a block.
+  //    - `'failed'` the tx failed for some reason, included on tx data.
+  _setTxStatus (txId, status) {
+    const txMeta = this.getTx(txId)
+    txMeta.status = status
+    this.emit(`${txMeta.id}:${status}`, txId)
+    this.emit(`tx:status-update`, txId, status)
+    if (status === 'submitted' || status === 'rejected') {
+      this.emit(`${txMeta.id}:finished`, txMeta)
+    }
+    this.updateTx(txMeta)
+    this.emit('update:badge')
+  }
+
+  // Saves the new/updated txList.
+  // Function is intended only for internal use
+  _saveTxList (transactions) {
+    this.store.updateState({ transactions })
+  }
+}
\ No newline at end of file