feat(settings): user can enable/disable notifications by category

src/app/AppLayout/AppLayout.tsx

@@ -53,7 +53,7 @@ import { SslErrorModal } from './SslErrorModal';
 import { AboutCryostatModal } from '@app/About/AboutCryostatModal';
 import cryostatLogoHorizontal from '@app/assets/logo-cryostat-3-horizontal.svg';
 import { SessionState } from '@app/Shared/Services/Login.service';
-import { combineLatest } from 'rxjs';
+import { NotificationCategory } from '@app/Shared/Services/NotificationChannel.service';
 
 interface IAppLayout {
   children: React.ReactNode;
@@ -285,7 +285,8 @@ const AppLayout: React.FunctionComponent<IAppLayout> = ({children}) => {
     <AlertGroup isToast>
       {
         notifications
-          .filter(n => !n.read && (Notifications.isProblemNotification(n) || n.variant === AlertVariant.success))
+          .filter(n => !n.read)
+          .filter(n => serviceContext.settings.notificationsEnabledFor(NotificationCategory[n.category || '']))
           .sort((prev, curr) => {
             if(!prev.timestamp) return -1;
             if(!curr.timestamp) return 1;

src/app/Events/EventTemplates.tsx

@@ -124,7 +124,7 @@ export const EventTemplates = () => {
 
   React.useEffect(() => {
     addSubscription(
-      context.notificationChannel.messages(NotificationCategory.TemplateCreated)
+      context.notificationChannel.messages(NotificationCategory.TemplateUploaded)
         .subscribe(v => setTemplates(old => old.concat(v.message.template)))
     );
   }, [addSubscription, context, context.notificationChannel, setTemplates]);

src/app/Notifications/Notifications.tsx

@@ -160,7 +160,7 @@ export class Notifications {
   }
 
   private isJvmDiscovery(n: Notification): boolean {
-    return (n.category === NotificationCategory.JvmDiscovery);
+    return (n.category === NotificationCategory.TargetJvmDiscovery);
   }
 
   static isProblemNotification(n: Notification): boolean {

src/app/Settings/AutoRefresh.tsx

@@ -37,7 +37,7 @@
  */
 
 import * as React from 'react';
-import { Checkbox, Text, TextVariants } from '@patternfly/react-core';
+import { Checkbox } from '@patternfly/react-core';
 import { ServiceContext } from '@app/Shared/Services/Services';
 import { DurationPicker } from '@app/DurationPicker/DurationPicker';
 import { UserSetting } from './Settings';

src/app/Settings/NotificationControl.tsx

@@ -0,0 +1,98 @@
+/*
+ * Copyright The Cryostat Authors
+ *
+ * The Universal Permissive License (UPL), Version 1.0
+ *
+ * Subject to the condition set forth below, permission is hereby granted to any
+ * person obtaining a copy of this software, associated documentation and/or data
+ * (collectively the "Software"), free of charge and under any and all copyright
+ * rights in the Software, and any and all patent rights owned or freely
+ * licensable by each licensor hereunder covering either (i) the unmodified
+ * Software as contributed to or provided by such licensor, or (ii) the Larger
+ * Works (as defined below), to deal in both
+ *
+ * (a) the Software, and
+ * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
+ * one is included with the Software (each a "Larger Work" to which the Software
+ * is contributed by such licensors),
+ *
+ * without restriction, including without limitation the rights to copy, create
+ * derivative works of, display, perform, and distribute the Software and make,
+ * use, sell, offer for sale, import, export, have made, and have sold the
+ * Software and the Larger Work(s), and to sublicense the foregoing rights on
+ * either these or other terms.
+ *
+ * This license is subject to the following condition:
+ * The above copyright notice and either this complete permission notice or at
+ * a minimum a reference to the UPL must be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+import * as React from 'react';
+import { Divider, ExpandableSection, Switch, Stack, StackItem } from '@patternfly/react-core';
+import { ServiceContext } from '@app/Shared/Services/Services';
+import { NotificationCategory, messageKeys } from '@app/Shared/Services/NotificationChannel.service';
+import { UserSetting } from './Settings';
+
+const Component = () => {
+  const context = React.useContext(ServiceContext);
+  const [state, setState] = React.useState(context.settings.notificationsEnabled());
+  const [expanded, setExpanded] = React.useState(false);
+
+  const handleCheckboxChange = React.useCallback((checked, element) => {
+    state.set(NotificationCategory[element.target.id], checked);
+    context.settings.setNotificationsEnabled(state);
+    setState(new Map(state));
+  }, [state, setState, context.settings]);
+
+  const handleCheckAll = React.useCallback(checked => {
+    const newState = new Map();
+    Array.from(state.entries()).forEach(v => newState.set(v[0], checked));
+    context.settings.setNotificationsEnabled(newState);
+    setState(newState);
+  }, [state, setState]);
+
+  const allChecked = React.useMemo(() => {
+    return Array.from(state.entries()).map(e => e[1]).reduce((a, b) => a && b);
+  }, [state]);
+
+  const labels = React.useMemo(() => {
+    const result = new Map<NotificationCategory, string>();
+    messageKeys.forEach((v, k) => {
+      result.set(k, v?.title || k);
+    });
+    return result;
+  }, [messageKeys]);
+
+  const switches = React.useMemo(() => {
+    return Array.from(state.entries(), ([key, value]) => <StackItem><Switch id={key} label={labels.get(key)} isChecked={value} onChange={handleCheckboxChange} /></StackItem>);
+  }, [state, labels]);
+
+  return (<>
+    <Stack hasGutter>
+      <StackItem><Switch id='all-notifications' label='All Notifications' isChecked={allChecked} onChange={handleCheckAll} /></StackItem>
+      <Divider />
+      <ExpandableSection
+        toggleText={expanded ? 'Show less' : 'Show more'}
+        onToggle={setExpanded}
+        isExpanded={expanded}
+      >
+        { switches }
+      </ExpandableSection>
+    </Stack>
+  </>);
+}
+
+export const NotificationControl: UserSetting = {
+  title: 'Notifications',
+  description: 'Enable or disable notifications by category.',
+  content: Component,
+}

src/app/Settings/Settings.tsx

@@ -41,13 +41,15 @@ import { Card, CardBody, CardTitle, Text, TextVariants } from '@patternfly/react
 import { BreadcrumbPage } from '@app/BreadcrumbPage/BreadcrumbPage';
 
 import { AutoRefresh } from './AutoRefresh';
+import { NotificationControl } from './NotificationControl';
 import { WebSocketDebounce } from './WebSocketDebounce';
 
 export const Settings: React.FunctionComponent<{}> = () => {
 
   const settings =
     [
       AutoRefresh,
+      NotificationControl,
       WebSocketDebounce,
     ].map(c => ({
       title: c.title,

src/app/Shared/Services/Api.service.tsx

@@ -41,8 +41,9 @@ import { catchError, concatMap, first, map, mergeMap, tap } from 'rxjs/operators
 import { Target, TargetService } from './Target.service';
 import { Notifications } from '@app/Notifications/Notifications';
 import { AuthMethod, LoginService, SessionState } from './Login.service';
-import {Rule} from '@app/Rules/Rules';
 import { RecordingLabel } from '@app/CreateRecording/EditRecordingLabels';
+import { Rule } from '@app/Rules/Rules';
+import { NotificationCategory } from './NotificationChannel.service';
 
 type ApiVersion = 'v1' | 'v2' | 'v2.1' | 'beta';
 
@@ -155,9 +156,9 @@ export class ApiService {
         error: err => {
           window.console.error(err);
           if (err.state === 'unavailable') {
-            this.notifications.danger(`Grafana ${err.state}`, err.message);
+            this.notifications.danger(`Grafana ${err.state}`, err.message, NotificationCategory.GrafanaConfiguration);
           } else {
-            this.notifications.warning(`Grafana ${err.state}`, err.message);
+            this.notifications.warning(`Grafana ${err.state}`, err.message, NotificationCategory.GrafanaConfiguration);
           }
         }
       });
@@ -514,7 +515,7 @@ export class ApiService {
         return from(resp.text());
       }
       throw resp.text();
-      })        
+      })
     );
   }
 
@@ -532,7 +533,7 @@ export class ApiService {
             return from(resp.text());
           }
           throw resp.text();
-          })        
+          })
         )
       ));
   }
@@ -593,7 +594,7 @@ export class ApiService {
 
   private stringifyRecordingLabels(labels: RecordingLabel[]): string {
     let arr = [] as Map<string, string>[];
-    labels.forEach(l => { 
+    labels.forEach(l => {
       arr[l.key] = l.value;
     });
     return JSON.stringify(Object.entries(arr));

src/app/Shared/Services/NotificationChannel.service.tsx

@@ -43,21 +43,24 @@ import { webSocket, WebSocketSubject } from 'rxjs/webSocket';
 import { AlertVariant } from '@patternfly/react-core';
 import { concatMap, distinctUntilChanged, filter } from 'rxjs/operators';
 import { AuthMethod, LoginService, SessionState } from './Login.service';
+import { Target } from './Target.service';
+import { TargetDiscoveryEvent } from './Targets.service';
 
 export enum NotificationCategory {
   WsClientActivity = 'WsClientActivity',
-  JvmDiscovery = 'TargetJvmDiscovery',
+  TargetJvmDiscovery = 'TargetJvmDiscovery',
   ActiveRecordingCreated = 'ActiveRecordingCreated',
   ActiveRecordingStopped = 'ActiveRecordingStopped',
   ActiveRecordingSaved = 'ActiveRecordingSaved',
   ActiveRecordingDeleted = 'ActiveRecordingDeleted',
   ArchivedRecordingCreated = 'ArchivedRecordingCreated',
   ArchivedRecordingDeleted = 'ArchivedRecordingDeleted',
-  TemplateCreated = 'TemplateUploaded',
+  TemplateUploaded = 'TemplateUploaded',
   TemplateDeleted = 'TemplateDeleted',
   RuleCreated = 'RuleCreated',
   RuleDeleted = 'RuleDeleted',
   RecordingMetadataUpdated  = 'RecordingMetadataUpdated',
+  GrafanaConfiguration = 'GrafanaConfiguration', // generated client-side
 }
 
 export enum CloseStatus {
@@ -72,12 +75,32 @@ interface ReadyState {
   code?: CloseStatus;
 }
 
-const messageKeys = new Map([
+export const messageKeys = new Map([
   [
-    // explicitly configure this category with a null mapper.
-    // This is a special case because we do not want to display an alert,
-    // the Targets.service already handles this
-    NotificationCategory.JvmDiscovery, null
+    // explicitly configure this category with a null message body mapper.
+    // This is a special case because this is generated client-side,
+    // not sent by the backend
+    NotificationCategory.GrafanaConfiguration, {
+      title: 'Grafana Configuration',
+    },
+  ],
+  [
+    NotificationCategory.TargetJvmDiscovery, {
+      variant: AlertVariant.info,
+      title: 'Target JVM Discovery',
+      body: v => {
+        const evt: TargetDiscoveryEvent = v.message.event;
+        const target: Target = evt.serviceRef;
+        switch (evt.kind) {
+          case 'FOUND':
+           return `Target "${target.alias}" appeared (${target.connectUrl})"`;
+          case 'LOST':
+            return `Target "${target.alias}" disappeared (${target.connectUrl})"`;
+          default:
+            return `Received a notification with category ${NotificationCategory.TargetJvmDiscovery} and unrecognized kind ${evt.kind}`;
+        }
+      }
+    } as NotificationMessageMapper,
   ],
   [
     NotificationCategory.WsClientActivity, {
@@ -121,19 +144,19 @@ const messageKeys = new Map([
   [
     NotificationCategory.ArchivedRecordingCreated, {
       variant: AlertVariant.success,
-      title: 'Recording Archived',
+      title: 'Archived Recording Uploaded',
       body: evt => `${evt.message.recording.name} was uploaded into archives`
     } as NotificationMessageMapper
   ],
   [
     NotificationCategory.ArchivedRecordingDeleted, {
       variant: AlertVariant.success,
-      title: 'Recording Deleted',
+      title: 'Archived Recording Deleted',
       body: evt => `${evt.message.recording.name} was deleted`
     } as NotificationMessageMapper
   ],
   [
-    NotificationCategory.TemplateCreated, {
+    NotificationCategory.TemplateUploaded, {
       variant: AlertVariant.success,
       title: 'Template Created',
       body: evt => `${evt.message.template.name} was created`
@@ -171,8 +194,8 @@ const messageKeys = new Map([
 
 interface NotificationMessageMapper {
   title: string;
-  body: (evt: NotificationMessage) => string;
-  variant: AlertVariant;
+  body?: (evt: NotificationMessage) => string;
+  variant?: AlertVariant;
 }
 
 export class NotificationChannel {
@@ -186,28 +209,24 @@ export class NotificationChannel {
     private readonly login: LoginService
   ) {
     messageKeys.forEach((value, key) => {
-      if (!value) {
+      if (!value || !value.body || !value.variant) {
         return;
       }
       this.messages(key).subscribe((msg: NotificationMessage) => {
+        if (!value || !value.body || !value.variant) {
+          return;
+        }
         const message = value.body(msg);
         notifications.notify({ title: value.title, message, category: key, variant: value.variant })
       });
     });
+
+    // fallback handler for unknown categories of message
     this._messages.pipe(
       filter(msg => !messageKeys.has(msg.meta.category as NotificationCategory))
     ).subscribe(msg => {
       const category = NotificationCategory[msg.meta.category as keyof typeof NotificationCategory];
-
-      var variant: AlertVariant;
-      if (category == NotificationCategory.WsClientActivity) {
-        variant = AlertVariant.info;
-      } else if (category == NotificationCategory.JvmDiscovery) {
-        variant = AlertVariant.info;
-      } else {
-        variant = AlertVariant.success;
-      }
-      notifications.notify({ title: msg.meta.category, message: msg.message, category, variant });
+      notifications.notify({ title: msg.meta.category, message: msg.message, category, variant: AlertVariant.success });
     });
 
     const notificationsUrl = fromFetch(`${this.login.authority}/api/v1/notifications_url`)