Add utility for getting token data; get token data in tx-list even if token has been removed.

ui/app/add-token.js

@@ -21,9 +21,7 @@ const fuse = new Fuse(contractList, {
 })
 const actions = require('./actions')
 const ethUtil = require('ethereumjs-util')
-const abi = require('human-standard-token-abi')
+const { tokenInfoGetter } = require('./token-util')
-const Eth = require('ethjs-query')
-const EthContract = require('ethjs-contract')
 const R = require('ramda')
 
 const emptyAddr = '0x0000000000000000000000000000000000000000'
@@ -63,11 +61,7 @@ function AddTokenScreen () {
 }
 
 AddTokenScreen.prototype.componentWillMount = function () {
-  if (typeof global.ethereumProvider === 'undefined') return
+  this.tokenInfoGetter = tokenInfoGetter()
-
-  this.eth = new Eth(global.ethereumProvider)
-  this.contract = new EthContract(this.eth)
-  this.TokenContract = this.contract(abi)
 }
 
 AddTokenScreen.prototype.toggleToken = function (address, token) {
@@ -164,18 +158,11 @@ AddTokenScreen.prototype.validate = function () {
 }
 
 AddTokenScreen.prototype.attemptToAutoFillTokenParams = async function (address) {
-  const contract = this.TokenContract.at(address)
+  const { symbol, decimals } = await this.tokenInfoGetter(address)
-
-  const results = await Promise.all([
-    contract.symbol(),
-    contract.decimals(),
-  ])
-
-  const [ symbol, decimals ] = results
   if (symbol && decimals) {
     this.setState({
-      customSymbol: symbol[0],
+      customSymbol: symbol,
-      customDecimals: decimals[0].toString(),
+      customDecimals: decimals.toString(),
     })
   }
 }

ui/app/components/tx-list-item.js

@@ -8,6 +8,7 @@ const abiDecoder = require('abi-decoder')
 abiDecoder.addABI(abi)
 const prefixForNetwork = require('../../lib/etherscan-prefix-for-network')
 const Identicon = require('./identicon')
+const contractMap = require('eth-contract-metadata')
 
 const { conversionUtil, multiplyCurrencies } = require('../conversion-util')
 
@@ -26,6 +27,24 @@ function mapStateToProps (state) {
 inherits(TxListItem, Component)
 function TxListItem () {
   Component.call(this)
+
+  this.state = {
+    total: null,
+    fiatTotal: null,
+  }
+}
+
+TxListItem.prototype.componentDidMount = async function () {
+  const { txParams = {} } = this.props
+
+  const decodedData = txParams.data && abiDecoder.decodeMethod(txParams.data)
+  const { name: txDataName } = decodedData || {}
+
+  const { total, fiatTotal } = txDataName === 'transfer'
+    ? await this.getSendTokenTotal()
+    : this.getSendEtherTotal()
+
+  this.setState({ total, fiatTotal })
 }
 
 TxListItem.prototype.getAddressText = function () {
@@ -85,7 +104,27 @@ TxListItem.prototype.getSendEtherTotal = function () {
   }
 }
 
-TxListItem.prototype.getSendTokenTotal = function () {
+TxListItem.prototype.getTokenInfo = async function () {
+  const { txParams = {}, tokenInfoGetter, tokens } = this.props
+  const toAddress = txParams.to
+
+  let decimals
+  let symbol
+
+  ({ decimals, symbol } = tokens.filter(({ address }) => address === toAddress)[0] || {})
+
+  if (!decimals && !symbol) {
+    ({ decimals, symbol } = contractMap[toAddress] || {})
+  }
+
+  if (!decimals && !symbol) {
+    ({ decimals, symbol } = await tokenInfoGetter(toAddress))
+  }
+
+  return { decimals, symbol }
+}
+
+TxListItem.prototype.getSendTokenTotal = async function () {
   const {
     txParams = {},
     tokens,
@@ -94,11 +133,10 @@ TxListItem.prototype.getSendTokenTotal = function () {
     currentCurrency,
   } = this.props
 
-  const toAddress = txParams.to
   const decodedData = txParams.data && abiDecoder.decodeMethod(txParams.data)
   const { params = [] } = decodedData || {}
   const { value } = params[1] || {}
-  const { decimals, symbol } = tokens.filter(({ address }) => address === toAddress)[0] || {}
+  const { decimals, symbol } = await this.getTokenInfo()
   const multiplier = Math.pow(10, Number(decimals || 0))
   const total = Number(value / multiplier)
 
@@ -139,15 +177,8 @@ TxListItem.prototype.render = function () {
     dateString,
     address,
     className,
-    txParams = {},
   } = this.props
-
+  const { total, fiatTotal } = this.state
-  const decodedData = txParams.data && abiDecoder.decodeMethod(txParams.data)
-  const { name: txDataName } = decodedData || {}
-
-  const { total, fiatTotal } = txDataName === 'transfer'
-    ? this.getSendTokenTotal()
-    : this.getSendEtherTotal()
 
   return h(`div${className || ''}`, {
     key: transActionId,

ui/app/components/tx-list.js

@@ -9,6 +9,7 @@ const ShiftListItem = require('./shift-list-item')
 const { formatBalance, formatDate } = require('../util')
 const { showConfTxPage } = require('../actions')
 const classnames = require('classnames')
+const { tokenInfoGetter } = require('../token-util')
 
 module.exports = connect(mapStateToProps, mapDispatchToProps)(TxList)
 
@@ -30,6 +31,10 @@ function TxList () {
   Component.call(this)
 }
 
+TxList.prototype.componentWillMount = function () {
+  this.tokenInfoGetter = tokenInfoGetter()
+}
+
 TxList.prototype.render = function () {
 
   const { txsToRender, showConfTxPage } = this.props
@@ -99,6 +104,7 @@ TxList.prototype.renderTransactionListItem = function (transaction, conversionRa
     transactionAmount,
     transactionHash,
     conversionRate,
+    tokenInfoGetter: this.tokenInfoGetter,
   }
 
   const isUnapproved = transactionStatus === 'unapproved';

ui/app/token-util.js

@@ -0,0 +1,36 @@
+const abi = require('human-standard-token-abi')
+const Eth = require('ethjs-query')
+const EthContract = require('ethjs-contract')
+
+const tokenInfoGetter = function () {
+  if (typeof global.ethereumProvider === 'undefined') return
+
+  const eth = new Eth(global.ethereumProvider)
+  const contract = new EthContract(eth)
+  const TokenContract = contract(abi)
+
+  const tokens = {}
+
+  return async (address) => {
+    if (tokens[address]) {
+      return tokens[address]
+    }
+
+    const contract = TokenContract.at(address)
+
+    const result = await Promise.all([
+      contract.symbol(),
+      contract.decimals(),
+    ])
+
+    const [ symbol = [], decimals = [] ] = result
+
+    tokens[address] = { symbol: symbol[0], decimals: decimals[0] }
+
+    return tokens[address]
+  }
+}
+
+module.exports = {
+  tokenInfoGetter,
+}