PLT-4853 adding purge cache button to the UI. (#4811)

* PLT_4853 adding purge cache button to the UI.

* Fixing loc stuff

webapp/components/admin_console/configuration_settings.jsx

@@ -10,6 +10,7 @@ import {FormattedMessage, FormattedHTMLMessage} from 'react-intl';
 import SettingsGroup from './settings_group.jsx';
 import TextSetting from './text_setting.jsx';
 import ReloadConfigButton from './reload_config.jsx';
+import PurgeCachesButton from './purge_caches.jsx';
 import WebserverModeDropdownSetting from './webserver_mode_dropdown_setting.jsx';
 import {ConnectionSecurityDropdownSettingWebserver} from './connection_security_dropdown_setting.jsx';
 import BooleanSetting from './boolean_setting.jsx';
@@ -252,6 +253,7 @@ export default class ConfigurationSettings extends AdminSettings {
                     disabled={false}
                 />
                 <ReloadConfigButton/>
+                <PurgeCachesButton/>
             </SettingsGroup>
         );
     }

webapp/components/admin_console/purge_caches.jsx

@@ -0,0 +1,112 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+import React from 'react';
+
+import Client from 'client/web_client.jsx';
+
+import {FormattedMessage} from 'react-intl';
+
+export default class PurgeCachesButton extends React.Component {
+    constructor(props) {
+        super(props);
+
+        this.handlePurge = this.handlePurge.bind(this);
+
+        this.state = {
+            loading: false,
+            fail: null
+        };
+    }
+
+    handlePurge(e) {
+        e.preventDefault();
+
+        this.setState({
+            loading: true,
+            fail: null
+        });
+
+        Client.invalidateAllCaches(
+            () => {
+                this.setState({
+                    loading: false
+                });
+            },
+            (err) => {
+                this.setState({
+                    loading: false,
+                    fail: err.message + ' - ' + err.detailed_error
+                });
+            }
+        );
+    }
+
+    render() {
+        if (global.window.mm_license.IsLicensed !== 'true') {
+            return <div/>;
+        }
+
+        let testMessage = null;
+        if (this.state.fail) {
+            testMessage = (
+                <div className='alert alert-warning'>
+                    <i className='fa fa-warning'/>
+                    <FormattedMessage
+                        id='admin.purge.purgeFail'
+                        defaultMessage='Purging unsuccessful: {error}'
+                        values={{
+                            error: this.state.fail
+                        }}
+                    />
+                </div>
+            );
+        }
+
+        const helpText = (
+            <FormattedMessage
+                id='admin.purge.purgeDescription'
+                defaultMessage='This will purge all the in-memory caches for things like sessions, accounts, channels, etc. Deployments using High Availability will attempt to purge all the servers in the cluster.  Purging the caches may adversly impact performance.'
+            />
+        );
+
+        let contents = null;
+        if (this.state.loading) {
+            contents = (
+                <span>
+                    <span className='fa fa-refresh icon--rotate'/>
+                    <FormattedMessage
+                        id='admin.purge.loading'
+                        defaultMessage='Loading...'
+                    />
+                </span>
+            );
+        } else {
+            contents = (
+                <FormattedMessage
+                    id='admin.purge.button'
+                    defaultMessage='Purge All Caches'
+                />
+            );
+        }
+
+        return (
+            <div className='form-group reload-config'>
+                <div className='col-sm-offset-4 col-sm-8'>
+                    <div>
+                        <button
+                            className='btn btn-default'
+                            onClick={this.handlePurge}
+                        >
+                            {contents}
+                        </button>
+                        {testMessage}
+                    </div>
+                    <div className='help-text'>
+                        {helpText}
+                    </div>
+                </div>
+            </div>
+        );
+    }
+}