1 files changed, 67 insertions, 0 deletions
diff --git a/ui/app/ducks/custom-gas.js b/ui/app/ducks/custom-gas.js
new file mode 100644
index 000000000..f1f483e93
--- /dev/null
+++ b/ui/app/ducks/custom-gas.js
@@ -0,0 +1,67 @@
+import extend from 'xtend'
+
+// Actions
+const SET_CUSTOM_GAS_PRICE = 'metamask/custom-gas/SET_CUSTOM_GAS_PRICE'
+const SET_CUSTOM_GAS_LIMIT = 'metamask/custom-gas/SET_CUSTOM_GAS_LIMIT'
+const SET_CUSTOM_GAS_ERRORS = 'metamask/custom-gas/SET_CUSTOM_GAS_ERRORS'
+const RESET_CUSTOM_GAS_STATE = 'metamask/custom-gas/RESET_CUSTOM_GAS_STATE'
+
+// TODO: determine if this approach to initState is consistent with conventional ducks pattern
+const initState = {
+  price: 0,
+  limit: 21000,
+  errors: {},
+}
+
+// Reducer
+export default function reducer ({ customGas: customGasState = initState }, action = {}) {
+  const newState = extend({}, customGasState)
+
+  switch (action.type) {
+    case SET_CUSTOM_GAS_PRICE:
+      return extend(newState, {
+        price: action.value,
+      })
+    case SET_CUSTOM_GAS_LIMIT:
+      return extend(newState, {
+        limit: action.value,
+      })
+    case SET_CUSTOM_GAS_ERRORS:
+      return extend(newState, {
+        errors: {
+          ...newState.errors,
+          ...action.value,
+        },
+      })
+    case RESET_CUSTOM_GAS_STATE:
+      return extend({}, initState)
+    default:
+      return newState
+  }
+}
+
+// Action Creators
+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 setCustomGasErrors (newErrors) {
+  return {
+    type: SET_CUSTOM_GAS_ERRORS,
+    value: newErrors,
+  }
+}
+
+export function resetCustomGasState () {
+  return { type: RESET_CUSTOM_GAS_STATE }
+}