1 files changed, 189 insertions, 0 deletions
diff --git a/ui/app/ducks/gas.duck.js b/ui/app/ducks/gas.duck.js
new file mode 100644
index 000000000..8b2fbcfdb
--- /dev/null
+++ b/ui/app/ducks/gas.duck.js
@@ -0,0 +1,189 @@
+import { clone } from 'ramda'
+
+// Actions
+const BASIC_GAS_ESTIMATE_LOADING_FINISHED = 'metamask/gas/BASIC_GAS_ESTIMATE_LOADING_FINISHED'
+const BASIC_GAS_ESTIMATE_LOADING_STARTED = 'metamask/gas/BASIC_GAS_ESTIMATE_LOADING_STARTED'
+const RESET_CUSTOM_GAS_STATE = 'metamask/gas/RESET_CUSTOM_GAS_STATE'
+const SET_BASIC_GAS_ESTIMATE_DATA = 'metamask/gas/SET_BASIC_GAS_ESTIMATE_DATA'
+const SET_CUSTOM_GAS_ERRORS = 'metamask/gas/SET_CUSTOM_GAS_ERRORS'
+const SET_CUSTOM_GAS_LIMIT = 'metamask/gas/SET_CUSTOM_GAS_LIMIT'
+const SET_CUSTOM_GAS_PRICE = 'metamask/gas/SET_CUSTOM_GAS_PRICE'
+const SET_CUSTOM_GAS_TOTAL = 'metamask/gas/SET_CUSTOM_GAS_TOTAL'
+
+// TODO: determine if this approach to initState is consistent with conventional ducks pattern
+const initState = {
+  customData: {
+    price: 0,
+    limit: 21000,
+  },
+  basicEstimates: {
+    average: null,
+    fastestWait: null,
+    fastWait: null,
+    fast: null,
+    safeLowWait: null,
+    blockNum: null,
+    avgWait: null,
+    blockTime: null,
+    speed: null,
+    fastest: null,
+    safeLow: null,
+  },
+  basicEstimateIsLoading: true,
+  errors: {},
+}
+
+// Reducer
+export default function reducer ({ gas: gasState = initState }, action = {}) {
+  const newState = clone(gasState)
+
+  switch (action.type) {
+    case BASIC_GAS_ESTIMATE_LOADING_STARTED:
+      return {
+        ...newState,
+        basicEstimateIsLoading: true,
+      }
+    case BASIC_GAS_ESTIMATE_LOADING_FINISHED:
+      return {
+        ...newState,
+        basicEstimateIsLoading: false,
+      }
+    case SET_BASIC_GAS_ESTIMATE_DATA:
+      return {
+        ...newState,
+        basicEstimates: action.value,
+      }
+    case SET_CUSTOM_GAS_PRICE:
+      return {
+        ...newState,
+        customData: {
+          ...newState.customData,
+          price: action.value,
+        },
+      }
+    case SET_CUSTOM_GAS_LIMIT:
+      return {
+        ...newState,
+        customData: {
+          ...newState.customData,
+          limit: action.value,
+        },
+      }
+    case SET_CUSTOM_GAS_TOTAL:
+      return {
+        ...newState,
+        customData: {
+          ...newState.customData,
+          total: action.value,
+        },
+      }
+    case SET_CUSTOM_GAS_ERRORS:
+      return {
+        ...newState,
+        errors: {
+          ...newState.errors,
+          ...action.value,
+        },
+      }
+    case RESET_CUSTOM_GAS_STATE:
+      return clone(initState)
+    default:
+      return newState
+  }
+}
+
+// Action Creators
+export function basicGasEstimatesLoadingStarted () {
+  return {
+    type: BASIC_GAS_ESTIMATE_LOADING_STARTED,
+  }
+}
+
+export function basicGasEstimatesLoadingFinished () {
+  return {
+    type: BASIC_GAS_ESTIMATE_LOADING_FINISHED,
+  }
+}
+
+export function fetchGasEstimates () {
+  return (dispatch) => {
+    dispatch(basicGasEstimatesLoadingStarted())
+
+    return fetch('https://ethgasstation.info/json/ethgasAPI.json', {
+      'headers': {},
+      'referrer': 'http://ethgasstation.info/json/',
+      'referrerPolicy': 'no-referrer-when-downgrade',
+      'body': null,
+      'method': 'GET',
+      'mode': 'cors'}
+    )
+      .then(r => r.json())
+      .then(({
+        average,
+        avgWait,
+        block_time: blockTime,
+        blockNum,
+        fast,
+        fastest,
+        fastestWait,
+        fastWait,
+        safeLow,
+        safeLowWait,
+        speed,
+      }) => {
+        dispatch(setBasicGasEstimateData({
+          average,
+          avgWait,
+          blockTime,
+          blockNum,
+          fast,
+          fastest,
+          fastestWait,
+          fastWait,
+          safeLow,
+          safeLowWait,
+          speed,
+        }))
+        dispatch(basicGasEstimatesLoadingFinished())
+      })
+  }
+}
+
+export function setBasicGasEstimateData (basicGasEstimateData) {
+  return {
+    type: SET_BASIC_GAS_ESTIMATE_DATA,
+    value: basicGasEstimateData,
+  }
+}
+
+export function setCustomGasPrice (newPrice) {
+  return {
+    type: SET_CUSTOM_GAS_PRICE,
+    value: newPrice,
+  }
+}
+
+export function setCustomGasLimit (newLimit) {
+  return {
+    type: SET_CUSTOM_GAS_LIMIT,
+    value: newLimit,
+  }
+}
+
+export function setCustomGasTotal (newTotal) {
+  return {
+    type: SET_CUSTOM_GAS_TOTAL,
+    value: newTotal,
+  }
+}
+
+export function setCustomGasErrors (newErrors) {
+  return {
+    type: SET_CUSTOM_GAS_ERRORS,
+    value: newErrors,
+  }
+}
+
+export function resetCustomGasState () {
+  return { type: RESET_CUSTOM_GAS_STATE }
+}