WA-230 Adding addBalance and fetchBalance actions

src/routes/safe/store/actions/addBalance.js

@@ -0,0 +1,19 @@
+// @flow
+import { createAction } from 'redux-actions'
+
+export const ADD_BALANCE = 'ADD_BALANCE'
+
+type BalanceProps = {
+  safeAddress: string,
+  funds: string,
+}
+
+const addBalance = createAction(
+  ADD_BALANCE,
+  (safeAddress: string, funds: string): BalanceProps => ({
+    safeAddress,
+    funds,
+  }),
+)
+
+export default addBalance

src/routes/safe/store/actions/fetchBalance.js

@@ -0,0 +1,11 @@
+// @flow
+import type { Dispatch as ReduxDispatch } from 'redux'
+import { getBalanceInEtherOf } from '~/wallets/getWeb3'
+import { type GlobalState } from '~/store/index'
+import addBalance from './addBalance'
+
+export default (safeAddress: string) => async (dispatch: ReduxDispatch<GlobalState>) => {
+  const balance: string = await getBalanceInEtherOf(safeAddress)
+
+  dispatch(addBalance(safeAddress, balance))
+}