added redux_sagas to project

Author: SDushan

src/sagas/productsSagas.js

@@ -0,0 +1,23 @@
+import {
+  FETCH_PRODUCTS,
+  FETCH_PRODUCTS_SUCCESS,
+  FETCH_PRODUCTS_FAILED,
+} from '../actions';
+import { put, call, takeLatest } from 'redux-saga/effects';
+import { getProducts } from '../services';
+
+export function* fetchProducts() {
+  try {
+    const receivedProducts = yield call(getProducts);
+    yield put({
+      type: FETCH_PRODUCTS_SUCCESS,
+      receivedProducts: receivedProducts.data,
+    });
+  } catch (error) {
+    yield put({ type: FETCH_PRODUCTS_FAILED, error });
+  }
+}
+
+export function* watchFetchProducts() {
+  yield takeLatest(FETCH_PRODUCTS, fetchProducts);
+}

src/sagas/rootSaga.js

@@ -0,0 +1,6 @@
+import { all } from 'redux-saga/effects';
+import { watchFetchProducts } from './productsSagas';
+
+export default function* rootSaga() {
+  yield all([watchFetchProducts()]);
+}