[explore] Split large reducer logic in ExploreViewContainer (#3088)

* split reducer logic for ExploreViewContainer

* fix saveModal component and unit tests

* revert changes in SaveModal_spec.
will make another commit just to improve test coverage for SaveModal component.

* remove comment-out code

* fix merge confilicts

superset/assets/javascripts/explore/actions/chartActions.js

@@ -0,0 +1,70 @@
+import { getExploreUrl } from '../exploreUtils';
+import { getFormDataFromControls } from '../stores/store';
+import { QUERY_TIMEOUT_THRESHOLD } from '../../constants';
+import { triggerQuery } from './exploreActions';
+
+const $ = window.$ = require('jquery');
+
+export const CHART_UPDATE_STARTED = 'CHART_UPDATE_STARTED';
+export function chartUpdateStarted(queryRequest, latestQueryFormData) {
+  return { type: CHART_UPDATE_STARTED, queryRequest, latestQueryFormData };
+}
+
+export const CHART_UPDATE_SUCCEEDED = 'CHART_UPDATE_SUCCEEDED';
+export function chartUpdateSucceeded(queryResponse) {
+  return { type: CHART_UPDATE_SUCCEEDED, queryResponse };
+}
+
+export const CHART_UPDATE_STOPPED = 'CHART_UPDATE_STOPPED';
+export function chartUpdateStopped(queryRequest) {
+  if (queryRequest) {
+    queryRequest.abort();
+  }
+  return { type: CHART_UPDATE_STOPPED };
+}
+
+export const CHART_UPDATE_TIMEOUT = 'CHART_UPDATE_TIMEOUT';
+export function chartUpdateTimeout(statusText) {
+  return { type: CHART_UPDATE_TIMEOUT, statusText };
+}
+
+export const CHART_UPDATE_FAILED = 'CHART_UPDATE_FAILED';
+export function chartUpdateFailed(queryResponse) {
+  return { type: CHART_UPDATE_FAILED, queryResponse };
+}
+
+export const UPDATE_CHART_STATUS = 'UPDATE_CHART_STATUS';
+export function updateChartStatus(status) {
+  return { type: UPDATE_CHART_STATUS, status };
+}
+
+export const CHART_RENDERING_FAILED = 'CHART_RENDERING_FAILED';
+export function chartRenderingFailed(error) {
+  return { type: CHART_RENDERING_FAILED, error };
+}
+
+export const RUN_QUERY = 'RUN_QUERY';
+export function runQuery(formData, force = false) {
+  return function (dispatch, getState) {
+    const { explore } = getState();
+    const lastQueryFormData = getFormDataFromControls(explore.controls);
+    const url = getExploreUrl(formData, 'json', force);
+    const queryRequest = $.ajax({
+      url,
+      dataType: 'json',
+      success(queryResponse) {
+        dispatch(chartUpdateSucceeded(queryResponse));
+      },
+      error(err) {
+        if (err.statusText === 'timeout') {
+          dispatch(chartUpdateTimeout(err.statusText));
+        } else if (err.statusText !== 'abort') {
+          dispatch(chartUpdateFailed(err.responseJSON));
+        }
+      },
+      timeout: QUERY_TIMEOUT_THRESHOLD,
+    });
+    dispatch(chartUpdateStarted(queryRequest, lastQueryFormData));
+    dispatch(triggerQuery(false));
+  };
+}