Disasters UI Improvements

SingularityUI/app/actions/api/base.es6

@@ -89,6 +89,11 @@ export function buildApiAction(actionName, opts = {}, keyFunc = undefined) {
             return Promise.resolve();
           }
           if (response.headers.get('Content-Type') === 'application/json') {
+            // void response cannot be parsed as JSON
+            if (response.headers.get('Content-Length') === '0') {
+              return Promise.resolve();
+            }
+
             return response.json();
           }
           return response.text();

SingularityUI/app/components/disasters/LiveConfiguration.jsx

@@ -1,5 +1,6 @@
 import React, { PropTypes, Component } from 'react';
 import { connect } from 'react-redux';
+import Messenger from 'messenger';
 import Utils from '../../utils';
 import Section from '../common/Section';
 import { EnableRackSensitivity, DisableRackSensitivity, OverridePlacementStrategy } from '../../actions/api/config';
@@ -58,6 +59,13 @@ class LiveConfiguration extends Component {
               onClick={() => this.props.overridePlacementStrategy(this.state.placementStrategy)}>
               Override
             </button>
+            <button
+              className="btn btn-primary"
+              alt="Clear Placement Strategy Override"
+              title="Clear Placement Strategy Override"
+              onClick={() => this.props.overridePlacementStrategy('')}>
+              Clear
+            </button>
           </div>
         </div>
       </Section>
@@ -74,9 +82,28 @@ function mapStateToProps(state) {
 
 function mapDispatchToProps(dispatch) {
   return {
-    enableRackSensitivity: () => dispatch(EnableRackSensitivity.trigger()),
-    disableRackSensitivity: () => dispatch(DisableRackSensitivity.trigger()),
-    overridePlacementStrategy: strategy => dispatch(OverridePlacementStrategy.trigger(strategy)),
+    enableRackSensitivity: () => dispatch(EnableRackSensitivity.trigger()).then(() => {
+      Messenger().info({
+        message: `Enabled rack sensitivity.`,
+        hideAfter: 5,
+      });
+    }),
+    disableRackSensitivity: () => dispatch(DisableRackSensitivity.trigger()).then(() => {
+      Messenger().info({
+        message: `Disabled rack sensitivity.`,
+        hideAfter: 5,
+      });
+    }),
+    overridePlacementStrategy: strategy => dispatch(OverridePlacementStrategy.trigger(strategy)).then(() => {
+      const message = strategy
+        ? `Set default placement strategy to ${strategy}.`
+        : `Cleared default placement strategy override`;
+
+      Messenger().info({
+        message,
+        hideAfter: 5,
+      });
+    }),
   }
 }