Use Parity on-chain registry only when is needed

app/scripts/controllers/preferences.js

@@ -19,6 +19,7 @@ class PreferencesController {
    * @property {boolean} store.useBlockie The users preference for blockie identicons within the UI
    * @property {object} store.featureFlags A key-boolean map, where keys refer to features and booleans to whether the
    * user wishes to see that feature
+   * @property {object} store.knownMethodData Contains all data methods known by the user
    * @property {string} store.currentLocale The preferred language locale key
    * @property {string} store.selectedAddress A hex string that matches the currently selected address in the app
    *
@@ -36,6 +37,7 @@ class PreferencesController {
         betaUI: true,
         skipAnnounceBetaUI: true,
       },
+      knownMethodData: {},
       currentLocale: opts.initLangCode,
       identities: {},
       lostIdentities: {},
@@ -98,6 +100,18 @@ class PreferencesController {
     this.store.updateState({ suggestedTokens: suggested })
   }
 
+  /**
+   * Add new methodData to state, to avoid requesting this information again through Infura
+   *
+   * @param {string} fourBytePrefix Four-byte method signature
+   * @param {string} methodData Corresponding data method
+   */
+  addKnownMethodData (fourBytePrefix, methodData) {
+    const knownMethodData = this.store.getState().knownMethodData
+    knownMethodData[fourBytePrefix] = methodData
+    this.store.updateState({ knownMethodData })
+  }
+
   /**
    * RPC engine middleware for requesting new asset added
    *

app/scripts/metamask-controller.js

@@ -425,6 +425,7 @@ module.exports = class MetamaskController extends EventEmitter {
       setAccountLabel: nodeify(preferencesController.setAccountLabel, preferencesController),
       setFeatureFlag: nodeify(preferencesController.setFeatureFlag, preferencesController),
       setPreference: nodeify(preferencesController.setPreference, preferencesController),
+      addKnownMethodData: nodeify(preferencesController.addKnownMethodData, preferencesController),
 
       // BlacklistController
       whitelistPhishingDomain: this.whitelistPhishingDomain.bind(this),

ui/app/actions.js

@@ -236,6 +236,7 @@ var actions = {
   removeToken,
   updateTokens,
   removeSuggestedTokens,
+  addKnownMethodData,
   UPDATE_TOKENS: 'UPDATE_TOKENS',
   setRpcTarget: setRpcTarget,
   delRpcTarget: delRpcTarget,
@@ -1490,7 +1491,6 @@ const backgroundSetLocked = () => {
       if (error) {
         return reject(error)
       }
-
       resolve()
     })
   })
@@ -1721,6 +1721,12 @@ function removeSuggestedTokens () {
   }
 }
 
+function addKnownMethodData (fourBytePrefix, methodData) {
+  return (dispatch) => {
+    background.addKnownMethodData(fourBytePrefix, methodData)
+  }
+}
+
 function updateTokens (newTokens) {
   return {
     type: actions.UPDATE_TOKENS,

ui/app/components/transaction-list-item/transaction-list-item.container.js

@@ -3,7 +3,7 @@ import { withRouter } from 'react-router-dom'
 import { compose } from 'recompose'
 import withMethodData from '../../higher-order-components/with-method-data'
 import TransactionListItem from './transaction-list-item.component'
-import { setSelectedToken, showModal, showSidebar } from '../../actions'
+import { setSelectedToken, showModal, showSidebar, addKnownMethodData } from '../../actions'
 import { hexToDecimal } from '../../helpers/conversions.util'
 import { getTokenData } from '../../helpers/transactions.util'
 import { increaseLastGasPrice } from '../../helpers/confirm-transaction/util'
@@ -15,11 +15,19 @@ import {
   setCustomGasLimit,
 } from '../../ducks/gas.duck'
 
+const mapStateToProps = state => {
+  const { metamask: { knownMethodData } } = state
+  return {
+    knownMethodData,
+  }
+}
+
 const mapDispatchToProps = dispatch => {
   return {
     fetchBasicGasAndTimeEstimates: () => dispatch(fetchBasicGasAndTimeEstimates()),
     fetchGasEstimates: (blockTime) => dispatch(fetchGasEstimates(blockTime)),
     setSelectedToken: tokenAddress => dispatch(setSelectedToken(tokenAddress)),
+    addKnownMethodData: (fourBytePrefix, methodData) => dispatch(addKnownMethodData(fourBytePrefix, methodData)),
     retryTransaction: (transaction, gasPrice) => {
       dispatch(setCustomGasPriceForRetry(gasPrice || transaction.txParams.gasPrice))
       dispatch(setCustomGasLimit(transaction.txParams.gas))
@@ -64,6 +72,6 @@ const mergeProps = (stateProps, dispatchProps, ownProps) => {
 
 export default compose(
   withRouter,
-  connect(null, mapDispatchToProps, mergeProps),
+  connect(mapStateToProps, mapDispatchToProps, mergeProps),
   withMethodData,
 )(TransactionListItem)

ui/app/helpers/transactions.util.js

@@ -59,6 +59,18 @@ export function isConfirmDeployContract (txData = {}) {
   return !txParams.to
 }
 
+/**
+ * Returns four-byte method signature from data
+ *
+ * @param {string} data - The hex data (@code txParams.data) of a transaction
+ * @returns {string} - The four-byte method signature
+ */
+export function getFourBytePrefix (data = '') {
+  const prefixedData = ethUtil.addHexPrefix(data)
+  const fourBytePrefix = prefixedData.slice(0, 10)
+  return fourBytePrefix
+}
+
 /**
  * Returns the action of a transaction as a key to be passed into the translator.
  * @param {Object} transaction - txData object

ui/app/higher-order-components/with-method-data/with-method-data.component.js

@@ -1,15 +1,18 @@
 import React, { PureComponent } from 'react'
 import PropTypes from 'prop-types'
-import { getMethodData } from '../../helpers/transactions.util'
+import { getMethodData, getFourBytePrefix } from '../../helpers/transactions.util'
 
 export default function withMethodData (WrappedComponent) {
   return class MethodDataWrappedComponent extends PureComponent {
     static propTypes = {
       transaction: PropTypes.object,
+      knownMethodData: PropTypes.object,
+      addKnownMethodData: PropTypes.func,
     }
 
     static defaultProps = {
       transaction: {},
+      knownMethodData: {},
     }
 
     state = {
@@ -23,12 +26,22 @@ export default function withMethodData (WrappedComponent) {
     }
 
     async fetchMethodData () {
-      const { transaction } = this.props
+      const { transaction, knownMethodData, addKnownMethodData } = this.props
       const { txParams: { data = '' } = {} } = transaction
 
       if (data) {
         try {
-          const methodData = await getMethodData(data)
+          let methodData
+          const fourBytePrefix = getFourBytePrefix(data)
+          if (fourBytePrefix in knownMethodData) {
+            methodData = knownMethodData[fourBytePrefix]
+          } else {
+            methodData = await getMethodData(data)
+            if (!Object.entries(methodData).length === 0) {
+              addKnownMethodData(fourBytePrefix, methodData)
+            }
+          }
+
           this.setState({ methodData, done: true })
         } catch (error) {
           this.setState({ done: true, error })

ui/app/reducers/metamask.js

@@ -54,6 +54,7 @@ function reduceMetamask (state, action) {
     preferences: {
       useNativeCurrencyAsPrimaryCurrency: true,
     },
+    knownMethodData: {},
   }, state.metamask)
 
   switch (action.type) {