Live: Extract scopes from CentrifugeSrv (#41051)

* Refactor: remove `scopes` from CentrifugeSrv, remove dependencies on window/config/user context

* Refactor: add GrafanaLiveChannelConfigService to wrap direct access to *Scope classes

* Refactor: added GrafanaLiveService acting like a proxy to GrafanaLiveSrv + LiveChannelConfigSrv

* Refactor: live module instantiation

* Refactor: import fixes

* Fix: URL construction in centrifugeSrv

public/app/features/live/centrifuge/service.ts

@@ -0,0 +1,248 @@
+import Centrifuge from 'centrifuge/dist/centrifuge';
+import { LiveDataStreamOptions, toDataQueryError } from '@grafana/runtime';
+import { BehaviorSubject, Observable } from 'rxjs';
+import {
+  DataFrame,
+  DataFrameJSON,
+  dataFrameToJSON,
+  DataQueryResponse,
+  isLiveChannelMessageEvent,
+  isLiveChannelStatusEvent,
+  LiveChannelAddress,
+  LiveChannelConfig,
+  LiveChannelConnectionState,
+  LiveChannelEvent,
+  LiveChannelPresenceStatus,
+  LoadingState,
+  StreamingDataFrame,
+} from '@grafana/data';
+import { CentrifugeLiveChannel } from './channel';
+import { liveTimer } from 'app/features/dashboard/dashgrid/liveTimer';
+
+type CentrifugeSrvDeps = {
+  appUrl: string;
+  orgId: number;
+  orgRole: string;
+  sessionId: string;
+  liveEnabled: boolean;
+};
+
+export class CentrifugeSrv {
+  readonly open = new Map<string, CentrifugeLiveChannel>();
+  readonly centrifuge: Centrifuge;
+  readonly connectionState: BehaviorSubject<boolean>;
+  readonly connectionBlocker: Promise<void>;
+
+  constructor(private deps: CentrifugeSrvDeps) {
+    const liveUrl = `${deps.appUrl.replace(/^http/, 'ws')}/api/live/ws`;
+    this.centrifuge = new Centrifuge(liveUrl, {});
+    this.centrifuge.setConnectData({
+      sessionId: deps.sessionId,
+      orgId: deps.orgId,
+    });
+    // orgRole is set when logged in *or* anonomus users can use grafana
+    if (deps.liveEnabled && deps.orgRole !== '') {
+      this.centrifuge.connect(); // do connection
+    }
+    this.connectionState = new BehaviorSubject<boolean>(this.centrifuge.isConnected());
+    this.connectionBlocker = new Promise<void>((resolve) => {
+      if (this.centrifuge.isConnected()) {
+        return resolve();
+      }
+      const connectListener = () => {
+        resolve();
+        this.centrifuge.removeListener('connect', connectListener);
+      };
+      this.centrifuge.addListener('connect', connectListener);
+    });
+
+    // Register global listeners
+    this.centrifuge.on('connect', this.onConnect);
+    this.centrifuge.on('disconnect', this.onDisconnect);
+    this.centrifuge.on('publish', this.onServerSideMessage);
+  }
+
+  //----------------------------------------------------------
+  // Internal functions
+  //----------------------------------------------------------
+
+  onConnect = (context: any) => {
+    this.connectionState.next(true);
+  };
+
+  onDisconnect = (context: any) => {
+    this.connectionState.next(false);
+  };
+
+  onServerSideMessage = (context: any) => {
+    console.log('Publication from server-side channel', context);
+  };
+
+  /**
+   * Get a channel.  If the scope, namespace, or path is invalid, a shutdown
+   * channel will be returned with an error state indicated in its status
+   */
+  getChannel<TMessage>(addr: LiveChannelAddress, config: LiveChannelConfig): CentrifugeLiveChannel<TMessage> {
+    const id = `${this.deps.orgId}/${addr.scope}/${addr.namespace}/${addr.path}`;
+    let channel = this.open.get(id);
+    if (channel != null) {
+      return channel;
+    }
+
+    channel = new CentrifugeLiveChannel(id, addr);
+    channel.shutdownCallback = () => {
+      this.open.delete(id); // remove it from the list of open channels
+    };
+    this.open.set(id, channel);
+
+    // Initialize the channel in the background
+    this.initChannel(config, channel).catch((err) => {
+      if (channel) {
+        channel.currentStatus.state = LiveChannelConnectionState.Invalid;
+        channel.shutdownWithError(err);
+      }
+      this.open.delete(id);
+    });
+
+    // return the not-yet initalized channel
+    return channel;
+  }
+
+  private async initChannel(config: LiveChannelConfig, channel: CentrifugeLiveChannel): Promise<void> {
+    const events = channel.initalize(config);
+    if (!this.centrifuge.isConnected()) {
+      await this.connectionBlocker;
+    }
+    channel.subscription = this.centrifuge.subscribe(channel.id, events);
+    return;
+  }
+
+  //----------------------------------------------------------
+  // Exported functions
+  //----------------------------------------------------------
+
+  /**
+   * Listen for changes to the connection state
+   */
+  getConnectionState() {
+    return this.connectionState.asObservable();
+  }
+
+  /**
+   * Watch for messages in a channel
+   */
+  getStream<T>(address: LiveChannelAddress, config: LiveChannelConfig): Observable<LiveChannelEvent<T>> {
+    return this.getChannel<T>(address, config).getStream();
+  }
+
+  /**
+   * Connect to a channel and return results as DataFrames
+   */
+  getDataStream(options: LiveDataStreamOptions, config: LiveChannelConfig): Observable<DataQueryResponse> {
+    return new Observable<DataQueryResponse>((subscriber) => {
+      const channel = this.getChannel(options.addr, config);
+      const key = options.key ?? `xstr/${streamCounter++}`;
+      let data: StreamingDataFrame | undefined = undefined;
+      let filtered: DataFrame | undefined = undefined;
+      let state = LoadingState.Streaming;
+      let last = liveTimer.lastUpdate;
+      let lastWidth = -1;
+
+      const process = (msg: DataFrameJSON) => {
+        if (!data) {
+          data = new StreamingDataFrame(msg, options.buffer);
+        } else {
+          data.push(msg);
+        }
+        state = LoadingState.Streaming;
+        const sameWidth = lastWidth === data.fields.length;
+        lastWidth = data.fields.length;
+
+        // Filter out fields
+        if (!filtered || msg.schema || !sameWidth) {
+          filtered = data;
+          if (options.filter) {
+            const { fields } = options.filter;
+            if (fields?.length) {
+              filtered = {
+                ...data,
+                fields: data.fields.filter((f) => fields.includes(f.name)),
+              };
+            }
+          }
+        }
+
+        const elapsed = liveTimer.lastUpdate - last;
+        if (elapsed > 1000 || liveTimer.ok) {
+          filtered.length = data.length; // make sure they stay up-to-date
+          subscriber.next({ state, data: [filtered], key });
+          last = liveTimer.lastUpdate;
+        }
+      };
+
+      if (options.frame) {
+        process(dataFrameToJSON(options.frame));
+      } else if (channel.lastMessageWithSchema) {
+        process(channel.lastMessageWithSchema);
+      }
+
+      const sub = channel.getStream().subscribe({
+        error: (err: any) => {
+          console.log('LiveQuery [error]', { err }, options.addr);
+          state = LoadingState.Error;
+          subscriber.next({ state, data: [data], key, error: toDataQueryError(err) });
+          sub.unsubscribe(); // close after error
+        },
+        complete: () => {
+          console.log('LiveQuery [complete]', options.addr);
+          if (state !== LoadingState.Error) {
+            state = LoadingState.Done;
+          }
+          // or track errors? subscriber.next({ state, data: [data], key });
+          subscriber.complete();
+          sub.unsubscribe();
+        },
+        next: (evt: LiveChannelEvent) => {
+          if (isLiveChannelMessageEvent(evt)) {
+            process(evt.message);
+            return;
+          }
+          if (isLiveChannelStatusEvent(evt)) {
+            if (evt.error) {
+              let error = toDataQueryError(evt.error);
+              error.message = `Streaming channel error: ${error.message}`;
+              state = LoadingState.Error;
+              subscriber.next({ state, data: [data], key, error });
+              return;
+            } else if (
+              evt.state === LiveChannelConnectionState.Connected ||
+              evt.state === LiveChannelConnectionState.Pending
+            ) {
+              if (evt.message) {
+                process(evt.message);
+              }
+              return;
+            }
+            console.log('ignore state', evt);
+          }
+        },
+      });
+
+      return () => {
+        sub.unsubscribe();
+      };
+    });
+  }
+
+  /**
+   * For channels that support presence, this will request the current state from the server.
+   *
+   * Join and leave messages will be sent to the open stream
+   */
+  getPresence(address: LiveChannelAddress, config: LiveChannelConfig): Promise<LiveChannelPresenceStatus> {
+    return this.getChannel(address, config).getPresence();
+  }
+}
+
+// This is used to give a unique key for each stream.  The actual value does not matter
+let streamCounter = 0;

public/app/features/live/channel-config/index.ts

@@ -0,0 +1,36 @@
+import { LiveChannelScope, LiveChannelSupport, SelectableValue } from '@grafana/data';
+import {
+  grafanaLiveCoreFeatures,
+  GrafanaLiveDataSourceScope,
+  GrafanaLivePluginScope,
+  GrafanaLiveScope,
+  GrafanaLiveStreamScope,
+} from './scope';
+import { GrafanaLiveChannelConfigSrv, ExistingLiveChannelScope } from './types';
+
+export class GrafanaLiveChannelConfigService implements GrafanaLiveChannelConfigSrv {
+  private readonly scopes: Record<LiveChannelScope, GrafanaLiveScope>;
+
+  constructor() {
+    this.scopes = Object.freeze({
+      [LiveChannelScope.Grafana]: grafanaLiveCoreFeatures,
+      [LiveChannelScope.DataSource]: new GrafanaLiveDataSourceScope(),
+      [LiveChannelScope.Plugin]: new GrafanaLivePluginScope(),
+      [LiveChannelScope.Stream]: new GrafanaLiveStreamScope(),
+    });
+  }
+
+  private getScope = (liveChannelScope: ExistingLiveChannelScope): GrafanaLiveScope =>
+    this.scopes[liveChannelScope as LiveChannelScope];
+
+  doesScopeExist = (liveChannelScope: LiveChannelScope): liveChannelScope is ExistingLiveChannelScope =>
+    Boolean(this.scopes[liveChannelScope]);
+
+  getChannelSupport = async (
+    liveChannelScope: ExistingLiveChannelScope,
+    namespace: string
+  ): Promise<LiveChannelSupport | undefined> => this.getScope(liveChannelScope).getChannelSupport(namespace);
+
+  getNamespaces = async (liveChannelScope: ExistingLiveChannelScope): Promise<Array<SelectableValue<string>>> =>
+    this.getScope(liveChannelScope).listNamespaces();
+}

public/app/features/live/channel-config/scope.ts

@@ -1,8 +1,9 @@
 import { LiveChannelScope, LiveChannelSupport, SelectableValue } from '@grafana/data';
 import { getDataSourceSrv } from '@grafana/runtime';
 import { config } from 'app/core/config';
-import { loadPlugin } from '../plugins/PluginPage';
-import { LiveMeasurementsSupport } from './measurements/measurementsSupport';
+import { loadPlugin } from 'app/features/plugins/PluginPage';
+import { LiveMeasurementsSupport } from '../measurements/measurementsSupport';
+import { CoreGrafanaLiveFeature } from './types';
 
 export abstract class GrafanaLiveScope {
   constructor(protected scope: LiveChannelScope) {}
@@ -18,12 +19,6 @@ export abstract class GrafanaLiveScope {
   abstract listNamespaces(): Promise<Array<SelectableValue<string>>>;
 }
 
-export interface CoreGrafanaLiveFeature {
-  name: string;
-  support: LiveChannelSupport;
-  description: string;
-}
-
 class GrafanaLiveCoreScope extends GrafanaLiveScope {
   readonly features = new Map<string, LiveChannelSupport>();
   readonly namespaces: Array<SelectableValue<string>> = [];

public/app/features/live/channel-config/types.ts

@@ -0,0 +1,18 @@
+import { LiveChannelScope, LiveChannelSupport, SelectableValue } from '@grafana/data';
+
+export interface CoreGrafanaLiveFeature {
+  name: string;
+  support: LiveChannelSupport;
+  description: string;
+}
+
+export type ExistingLiveChannelScope = LiveChannelScope & { readonly discriminator: unique symbol };
+
+export interface GrafanaLiveChannelConfigSrv {
+  doesScopeExist: (liveChannelScope: LiveChannelScope) => liveChannelScope is ExistingLiveChannelScope;
+  getChannelSupport: (
+    liveChannelScope: ExistingLiveChannelScope,
+    namespace: string
+  ) => Promise<LiveChannelSupport | undefined>;
+  getNamespaces: (liveChannelScope: ExistingLiveChannelScope) => Promise<Array<SelectableValue<string>>>;
+}

public/app/features/live/dashboard/dashboardWatcher.ts

@@ -12,8 +12,8 @@ import {
 } from '@grafana/data';
 import { DashboardChangedModal } from './DashboardChangedModal';
 import { DashboardEvent, DashboardEventAction } from './types';
-import { CoreGrafanaLiveFeature } from '../scopes';
-import { sessionId } from '../live';
+import { CoreGrafanaLiveFeature } from '../channel-config/types';
+import { sessionId } from 'app/features/live';
 import { ShowModalReactEvent } from '../../../types/events';
 import { Unsubscribable } from 'rxjs';
 

public/app/features/live/features.ts

@@ -1,6 +1,6 @@
 import { LiveChannelType } from '@grafana/data';
 import { getDashboardChannelsFeature } from './dashboard/dashboardWatcher';
-import { grafanaLiveCoreFeatures } from './scopes';
+import { grafanaLiveCoreFeatures } from './channel-config/scope';
 
 export function registerLiveFeatures() {
   grafanaLiveCoreFeatures.register({

public/app/features/live/index.ts

@@ -0,0 +1,40 @@
+import { config, getBackendSrv, getGrafanaLiveSrv, setGrafanaLiveSrv } from '@grafana/runtime';
+import { CentrifugeSrv } from './centrifuge/service';
+import { registerLiveFeatures } from './features';
+import { GrafanaLiveService } from './live';
+import { GrafanaLiveChannelConfigService } from './channel-config';
+import { GrafanaLiveChannelConfigSrv } from './channel-config/types';
+import { contextSrv } from '../../core/services/context_srv';
+
+const grafanaLiveScopesSingleton = new GrafanaLiveChannelConfigService();
+
+export const getGrafanaLiveScopes = (): GrafanaLiveChannelConfigSrv => grafanaLiveScopesSingleton;
+
+export const sessionId =
+  (window as any)?.grafanaBootData?.user?.id +
+  '/' +
+  Date.now().toString(16) +
+  '/' +
+  Math.random().toString(36).substring(2, 15);
+
+export function initGrafanaLive() {
+  const centrifugeSrv = new CentrifugeSrv({
+    appUrl: `${window.location.origin}${config.appSubUrl}`,
+    orgId: contextSrv.user.orgId,
+    orgRole: contextSrv.user.orgRole,
+    liveEnabled: config.liveEnabled,
+    sessionId,
+  });
+  setGrafanaLiveSrv(
+    new GrafanaLiveService({
+      scopes: getGrafanaLiveScopes(),
+      centrifugeSrv,
+      backendSrv: getBackendSrv(),
+    })
+  );
+  registerLiveFeatures();
+}
+
+export function getGrafanaLiveCentrifugeSrv() {
+  return getGrafanaLiveSrv() as GrafanaLiveService;
+}

public/app/features/live/live.ts

@@ -1,176 +1,81 @@
-import Centrifuge from 'centrifuge/dist/centrifuge';
+import { BackendSrv, GrafanaLiveSrv, LiveDataStreamOptions } from '@grafana/runtime';
+import { CentrifugeSrv } from './centrifuge/service';
+
+import { mergeMap, from, of, Observable } from 'rxjs';
 import {
-  GrafanaLiveSrv,
-  setGrafanaLiveSrv,
-  getGrafanaLiveSrv,
-  config,
-  LiveDataStreamOptions,
-  toDataQueryError,
-  getBackendSrv,
-} from '@grafana/runtime';
-import { BehaviorSubject, Observable, of } from 'rxjs';
-import {
-  LiveChannelScope,
-  LiveChannelAddress,
-  LiveChannelConnectionState,
-  LiveChannelConfig,
-  LiveChannelEvent,
   DataQueryResponse,
-  LiveChannelPresenceStatus,
   isValidLiveChannelAddress,
+  LiveChannelAddress,
+  LiveChannelConfig,
+  LiveChannelConnectionState,
+  LiveChannelEvent,
+  LiveChannelEventType,
+  LiveChannelPresenceStatus,
   LoadingState,
-  DataFrameJSON,
-  StreamingDataFrame,
-  DataFrame,
-  dataFrameToJSON,
-  isLiveChannelMessageEvent,
-  isLiveChannelStatusEvent,
   toLiveChannelId,
 } from '@grafana/data';
-import { CentrifugeLiveChannel, getErrorChannel } from './channel';
-import {
-  GrafanaLiveScope,
-  grafanaLiveCoreFeatures,
-  GrafanaLiveDataSourceScope,
-  GrafanaLivePluginScope,
-  GrafanaLiveStreamScope,
-} from './scopes';
-import { registerLiveFeatures } from './features';
-import { contextSrv } from '../../core/services/context_srv';
-import { liveTimer } from '../dashboard/dashgrid/liveTimer';
+import { GrafanaLiveChannelConfigSrv } from './channel-config/types';
+import { catchError } from 'rxjs/operators';
 
-export const sessionId =
-  (window as any)?.grafanaBootData?.user?.id +
-  '/' +
-  Date.now().toString(16) +
-  '/' +
-  Math.random().toString(36).substring(2, 15);
+type GrafanaLiveServiceDeps = {
+  scopes: GrafanaLiveChannelConfigSrv;
+  centrifugeSrv: CentrifugeSrv;
+  backendSrv: BackendSrv;
+};
 
-export class CentrifugeSrv implements GrafanaLiveSrv {
-  readonly open = new Map<string, CentrifugeLiveChannel>();
-  readonly centrifuge: Centrifuge;
-  readonly connectionState: BehaviorSubject<boolean>;
-  readonly connectionBlocker: Promise<void>;
-  readonly scopes: Record<LiveChannelScope, GrafanaLiveScope>;
-  private readonly orgId: number;
-
-  constructor() {
-    const baseURL = window.location.origin.replace('http', 'ws');
-    const liveUrl = `${baseURL}${config.appSubUrl}/api/live/ws`;
-
-    this.orgId = contextSrv.user.orgId;
-    this.centrifuge = new Centrifuge(liveUrl, {});
-    this.centrifuge.setConnectData({
-      sessionId,
-      orgId: this.orgId,
-    });
-    // orgRole is set when logged in *or* anonomus users can use grafana
-    if (config.liveEnabled && contextSrv.user.orgRole !== '') {
-      this.centrifuge.connect(); // do connection
-    }
-    this.connectionState = new BehaviorSubject<boolean>(this.centrifuge.isConnected());
-    this.connectionBlocker = new Promise<void>((resolve) => {
-      if (this.centrifuge.isConnected()) {
-        return resolve();
-      }
-      const connectListener = () => {
-        resolve();
-        this.centrifuge.removeListener('connect', connectListener);
-      };
-      this.centrifuge.addListener('connect', connectListener);
-    });
-
-    this.scopes = {
-      [LiveChannelScope.Grafana]: grafanaLiveCoreFeatures,
-      [LiveChannelScope.DataSource]: new GrafanaLiveDataSourceScope(),
-      [LiveChannelScope.Plugin]: new GrafanaLivePluginScope(),
-      [LiveChannelScope.Stream]: new GrafanaLiveStreamScope(),
-    };
-
-    // Register global listeners
-    this.centrifuge.on('connect', this.onConnect);
-    this.centrifuge.on('disconnect', this.onDisconnect);
-    this.centrifuge.on('publish', this.onServerSideMessage);
-  }
-
-  //----------------------------------------------------------
-  // Internal functions
-  //----------------------------------------------------------
-
-  onConnect = (context: any) => {
-    this.connectionState.next(true);
-  };
-
-  onDisconnect = (context: any) => {
-    this.connectionState.next(false);
-  };
-
-  onServerSideMessage = (context: any) => {
-    console.log('Publication from server-side channel', context);
-  };
-
-  /**
-   * Get a channel.  If the scope, namespace, or path is invalid, a shutdown
-   * channel will be returned with an error state indicated in its status
-   */
-  getChannel<TMessage>(addr: LiveChannelAddress): CentrifugeLiveChannel<TMessage> {
-    const id = `${this.orgId}/${addr.scope}/${addr.namespace}/${addr.path}`;
-    let channel = this.open.get(id);
-    if (channel != null) {
-      return channel;
-    }
-
-    const scope = this.scopes[addr.scope];
-    if (!scope) {
-      return getErrorChannel<TMessage>('invalid scope', id, addr) as any;
-    }
-
-    channel = new CentrifugeLiveChannel(id, addr);
-    channel.shutdownCallback = () => {
-      this.open.delete(id); // remove it from the list of open channels
-    };
-    this.open.set(id, channel);
-
-    // Initialize the channel in the background
-    this.initChannel(scope, channel).catch((err) => {
-      if (channel) {
-        channel.currentStatus.state = LiveChannelConnectionState.Invalid;
-        channel.shutdownWithError(err);
-      }
-      this.open.delete(id);
-    });
-
-    // return the not-yet initalized channel
-    return channel;
-  }
-
-  private async initChannel(scope: GrafanaLiveScope, channel: CentrifugeLiveChannel): Promise<void> {
-    const { addr } = channel;
-    const support = await scope.getChannelSupport(addr.namespace);
-    if (!support) {
-      throw new Error(channel.addr.namespace + ' does not support streaming');
-    }
-    const config = support.getChannelConfig(addr.path);
-    if (!config) {
-      throw new Error('unknown path: ' + addr.path);
-    }
-    const events = channel.initalize(config);
-    if (!this.centrifuge.isConnected()) {
-      await this.connectionBlocker;
-    }
-    channel.subscription = this.centrifuge.subscribe(channel.id, events);
-    return;
-  }
-
-  //----------------------------------------------------------
-  // Exported functions
-  //----------------------------------------------------------
+export class GrafanaLiveService implements GrafanaLiveSrv {
+  constructor(private deps: GrafanaLiveServiceDeps) {}
 
   /**
    * Listen for changes to the connection state
    */
-  getConnectionState() {
-    return this.connectionState.asObservable();
+  getConnectionState(): Observable<boolean> {
+    return this.deps.centrifugeSrv.getConnectionState();
+  }
+
+  /**
+   * Connect to a channel and return results as DataFrames
+   */
+  getDataStream(options: LiveDataStreamOptions): Observable<DataQueryResponse> {
+    const channelConfig = this.getChannelInfo(options.addr);
+
+    return from(channelConfig).pipe(
+      mergeMap((config) => this.deps.centrifugeSrv.getDataStream(options, config)),
+      catchError((error) => this.getInvalidDataStream(error, options))
+    );
+  }
+
+  /**
+   * Watch for messages in a channel
+   */
+  getStream<T>(address: LiveChannelAddress): Observable<LiveChannelEvent<T>> {
+    const channelConfig = this.getChannelInfo(address);
+    return from(channelConfig).pipe(
+      mergeMap((config) => this.deps.centrifugeSrv.getStream<T>(address, config)),
+      catchError((error) => this.getInvalidChannelStream<T>(error, address))
+    );
+  }
+
+  /**
+   * Publish into a channel
+   *
+   * @alpha -- experimental
+   */
+  async publish(address: LiveChannelAddress, data: any): Promise<any> {
+    return this.deps.backendSrv.post(`api/live/publish`, {
+      channel: toLiveChannelId(address), // orgId is from user
+      data,
+    });
+  }
+
+  /**
+   * For channels that support presence, this will request the current state from the server.
+   *
+   * Join and leave messages will be sent to the open stream
+   */
+  async getPresence(address: LiveChannelAddress): Promise<LiveChannelPresenceStatus> {
+    const channelConfig = await this.getChannelInfo(address);
+    return this.deps.centrifugeSrv.getPresence(address, channelConfig);
   }
 
   /**
@@ -182,162 +87,42 @@ export class CentrifugeSrv implements GrafanaLiveSrv {
    * the channel is shutdown
    */
   async getChannelInfo(addr: LiveChannelAddress): Promise<LiveChannelConfig> {
-    const scope = this.scopes[addr.scope];
-    if (!scope) {
+    if (!isValidLiveChannelAddress(addr)) {
+      return Promise.reject('invalid live channel address');
+    }
+
+    if (!this.deps.scopes.doesScopeExist(addr.scope)) {
       return Promise.reject('invalid scope');
     }
 
-    const support = await scope.getChannelSupport(addr.namespace);
+    const support = await this.deps.scopes.getChannelSupport(addr.scope, addr.namespace);
     if (!support) {
       return Promise.reject(addr.namespace + ' does not support streaming');
     }
     return support.getChannelConfig(addr.path)!;
   }
 
-  /**
-   * Watch for messages in a channel
-   */
-  getStream<T>(address: LiveChannelAddress): Observable<LiveChannelEvent<T>> {
-    return this.getChannel<T>(address).getStream();
-  }
-
-  /**
-   * Connect to a channel and return results as DataFrames
-   */
-  getDataStream(options: LiveDataStreamOptions): Observable<DataQueryResponse> {
-    if (!isValidLiveChannelAddress(options.addr)) {
-      return of({
-        error: toDataQueryError(`invalid channel address: ${JSON.stringify(options.addr)}`),
-        state: LoadingState.Error,
-        data: options.frame ? [options.frame] : [],
-      });
-    }
-
-    return new Observable<DataQueryResponse>((subscriber) => {
-      const channel = this.getChannel(options.addr);
-      const key = options.key ?? `xstr/${streamCounter++}`;
-      let data: StreamingDataFrame | undefined = undefined;
-      let filtered: DataFrame | undefined = undefined;
-      let state = LoadingState.Streaming;
-      let last = liveTimer.lastUpdate;
-      let lastWidth = -1;
-
-      const process = (msg: DataFrameJSON) => {
-        if (!data) {
-          data = new StreamingDataFrame(msg, options.buffer);
-        } else {
-          data.push(msg);
-        }
-        state = LoadingState.Streaming;
-        const sameWidth = lastWidth === data.fields.length;
-        lastWidth = data.fields.length;
-
-        // Filter out fields
-        if (!filtered || msg.schema || !sameWidth) {
-          filtered = data;
-          if (options.filter) {
-            const { fields } = options.filter;
-            if (fields?.length) {
-              filtered = {
-                ...data,
-                fields: data.fields.filter((f) => fields.includes(f.name)),
-              };
-            }
-          }
-        }
-
-        const elapsed = liveTimer.lastUpdate - last;
-        if (elapsed > 1000 || liveTimer.ok) {
-          filtered.length = data.length; // make sure they stay up-to-date
-          subscriber.next({ state, data: [filtered], key });
-          last = liveTimer.lastUpdate;
-        }
-      };
-
-      if (options.frame) {
-        process(dataFrameToJSON(options.frame));
-      } else if (channel.lastMessageWithSchema) {
-        process(channel.lastMessageWithSchema);
-      }
-
-      const sub = channel.getStream().subscribe({
-        error: (err: any) => {
-          console.log('LiveQuery [error]', { err }, options.addr);
-          state = LoadingState.Error;
-          subscriber.next({ state, data: [data], key, error: toDataQueryError(err) });
-          sub.unsubscribe(); // close after error
-        },
-        complete: () => {
-          console.log('LiveQuery [complete]', options.addr);
-          if (state !== LoadingState.Error) {
-            state = LoadingState.Done;
-          }
-          // or track errors? subscriber.next({ state, data: [data], key });
-          subscriber.complete();
-          sub.unsubscribe();
-        },
-        next: (evt: LiveChannelEvent) => {
-          if (isLiveChannelMessageEvent(evt)) {
-            process(evt.message);
-            return;
-          }
-          if (isLiveChannelStatusEvent(evt)) {
-            if (evt.error) {
-              let error = toDataQueryError(evt.error);
-              error.message = `Streaming channel error: ${error.message}`;
-              state = LoadingState.Error;
-              subscriber.next({ state, data: [data], key, error });
-              return;
-            } else if (
-              evt.state === LiveChannelConnectionState.Connected ||
-              evt.state === LiveChannelConnectionState.Pending
-            ) {
-              if (evt.message) {
-                process(evt.message);
-              }
-              return;
-            }
-            console.log('ignore state', evt);
-          }
-        },
-      });
-
-      return () => {
-        sub.unsubscribe();
-      };
+  private getInvalidChannelStream = <T>(error: Error, address: LiveChannelAddress): Observable<LiveChannelEvent<T>> => {
+    return of({
+      type: LiveChannelEventType.Status,
+      id: `${address.scope}/${address.namespace}/${address.path}`,
+      timestamp: Date.now(),
+      state: LiveChannelConnectionState.Invalid,
+      error,
+      message: error.message,
     });
-  }
+  };
 
-  /**
-   * For channels that support presence, this will request the current state from the server.
-   *
-   * Join and leave messages will be sent to the open stream
-   */
-  getPresence(address: LiveChannelAddress): Promise<LiveChannelPresenceStatus> {
-    return this.getChannel(address).getPresence();
-  }
-
-  /**
-   * Publish into a channel
-   *
-   * @alpha -- experimental
-   */
-  publish(address: LiveChannelAddress, data: any): Promise<any> {
-    return getBackendSrv().post(`api/live/publish`, {
-      channel: toLiveChannelId(address), // orgId is from user
-      data,
+  private getInvalidDataStream = (error: Error, options: LiveDataStreamOptions): Observable<DataQueryResponse> => {
+    return of({
+      error: {
+        data: {
+          error: error.stack,
+        },
+        message: error.message,
+      },
+      state: LoadingState.Error,
+      data: options.frame ? [options.frame] : [],
     });
-  }
-}
-
-// This is used to give a unique key for each stream.  The actual value does not matter
-let streamCounter = 0;
-
-export function getGrafanaLiveCentrifugeSrv() {
-  return getGrafanaLiveSrv() as CentrifugeSrv;
-}
-
-export function initGrafanaLive() {
-  setGrafanaLiveSrv(new CentrifugeSrv());
-  registerLiveFeatures();
+  };
 }

public/app/plugins/panel/live/LiveChannelEditor.tsx

@@ -11,7 +11,7 @@ import {
 } from '@grafana/data';
 
 import { LivePanelOptions } from './types';
-import { getGrafanaLiveCentrifugeSrv } from 'app/features/live/live';
+import { getGrafanaLiveScopes } from 'app/features/live';
 import { config } from 'app/core/config';
 
 type Props = StandardEditorProps<LiveChannelAddress, any, LivePanelOptions>;
@@ -44,12 +44,27 @@ export class LiveChannelEditor extends PureComponent<Props, State> {
     }
   }
 
+  async getScopeDetails() {
+    const { scope, namespace } = this.props.value;
+    const srv = getGrafanaLiveScopes();
+
+    if (!srv.doesScopeExist(scope)) {
+      return {
+        namespaces: [],
+        support: undefined,
+      };
+    }
+
+    const namespaces = await srv.getNamespaces(scope);
+    const support = namespace ? await srv.getChannelSupport(scope, namespace) : undefined;
+    return {
+      namespaces,
+      support,
+    };
+  }
+
   async updateSelectOptions() {
-    const { value } = this.props;
-    const { scope, namespace } = value;
-    const srv = getGrafanaLiveCentrifugeSrv();
-    const namespaces = await srv.scopes[scope].listNamespaces();
-    const support = namespace ? await srv.scopes[scope].getChannelSupport(namespace) : undefined;
+    const { namespaces, support } = await this.getScopeDetails();
 
     this.setState({
       namespaces,

public/app/routes/GrafanaCtrl.ts

@@ -29,7 +29,7 @@ import { DashboardSrv, setDashboardSrv } from 'app/features/dashboard/services/D
 import { IRootScopeService, IAngularEvent, auto } from 'angular';
 import { AppEvent } from '@grafana/data';
 import { backendSrv } from 'app/core/services/backend_srv';
-import { initGrafanaLive } from 'app/features/live/live';
+import { initGrafanaLive } from 'app/features/live';
 
 export type GrafanaRootScope = IRootScopeService & AppEventEmitter & AppEventConsumer & { colors: string[] };