feat: Introduce a library for embedded iframe <-> host communication

superset-embedded-sdk/package.json

@@ -22,7 +22,7 @@
   "module": "lib/index.js",
   "types": "dist/index.d.ts",
   "scripts": {
-    "build": "tsc & babel src --out-dir lib --extensions '.ts,.tsx' & webpack --mode production",
+    "build": "tsc ; babel src --out-dir lib --extensions '.ts,.tsx' ; webpack --mode production",
     "ci:release": "node ./release-if-necessary.js",
     "test": "echo \"Error: no test specified\" && exit 1"
   },

superset-embedded-sdk/release-if-necessary.js

@@ -21,8 +21,16 @@ const { execSync } = require('child_process');
 const axios = require('axios');
 const { name, version } = require('./package.json');
 
+function log(...args) {
+  console.log('[embedded-sdk-release]', ...args);
+}
+
+function logError(...args) {
+  console.error('[embedded-sdk-release]', ...args);
+}
+
 (async () => {
-  console.log(`checking if ${name}@${version} needs releasing`);
+  log(`checking if ${name}@${version} needs releasing`);
 
   const packageUrl = `https://registry.npmjs.org/${name}/${version}`;
   // npm commands output a bunch of garbage in the edge cases,
@@ -33,14 +41,21 @@ const { name, version } = require('./package.json');
   });
 
   if (status === 200) {
-    console.log('version already exists on npm, exiting');
+    log('version already exists on npm, exiting');
   } else if (status === 404) {
-    console.log('release required, building');
-    execSync('npm run build');
-    execSync('npm publish --access public');
-    console.log(`published ${version} to npm`);
+    log('release required, building');
+    try {
+      execSync('npm run build', { stdio: 'pipe' });
+      log('build successful, publishing')
+      execSync('npm publish --access public', { stdio: 'pipe' });
+      log(`published ${version} to npm`);
+    } catch (err) {
+      console.error(String(err.stdout));
+      logError('Encountered an error, details should be above');
+      process.exitCode = 1;
+    }
   } else {
-    console.error(`ERROR: Received unexpected http status code ${status} from GET ${packageUrl}
+    logError(`ERROR: Received unexpected http status code ${status} from GET ${packageUrl}
 The embedded sdk release script might need to be fixed, or maybe you just need to try again later.`);
     process.exitCode = 1;
   }

superset-embedded-sdk/src/index.ts

@@ -19,6 +19,9 @@
 
 import { IFRAME_COMMS_MESSAGE_TYPE } from './const';
 
+// We can swap this out for the actual switchboard package once it gets published
+import { Switchboard } from '../../superset-frontend/packages/superset-ui-switchboard/src/switchboard';
+
 /**
  * The function to fetch a guest token from your Host App's backend server.
  * The Host App backend must supply an API endpoint
@@ -35,6 +38,17 @@ export type EmbedDashboardParams = {
   mountPoint: HTMLElement
   /** A function to fetch a guest token from the Host App's backend server */
   fetchGuestToken: GuestTokenFetchFn
+  /** Are we in debug mode? */
+  debug?: boolean
+}
+
+export type Size = {
+  width: number, height: number
+}
+
+export type EmbeddedDashboard = {
+  getScrollSize: () => Promise<Size>
+  unmount: () => void
 }
 
 /**
@@ -44,15 +58,18 @@ export async function embedDashboard({
   id,
   supersetDomain,
   mountPoint,
-  fetchGuestToken
-}: EmbedDashboardParams) {
+  fetchGuestToken,
+  debug = false
+}: EmbedDashboardParams): Promise<EmbeddedDashboard> {
   function log(...info: unknown[]) {
-    console.debug(`[superset-embedded-sdk][dashboard ${id}]`, ...info);
+    if (debug) {
+      console.debug(`[superset-embedded-sdk][dashboard ${id}]`, ...info);
+    }
   }
 
   log('embedding');
 
-  async function mountIframe(): Promise<MessagePort> {
+  async function mountIframe(): Promise<Switchboard> {
     return new Promise(resolve => {
       const iframe = document.createElement('iframe');
 
@@ -83,7 +100,7 @@ export async function embedDashboard({
         log('sent message channel to the iframe');
 
         // return our port from the promise
-        resolve(ourPort);
+        resolve(new Switchboard({ port: ourPort, name: 'superset-embedded-sdk', debug }));
       });
 
       iframe.src = `${supersetDomain}/dashboard/${id}/embedded`;
@@ -94,18 +111,21 @@ export async function embedDashboard({
 
   const [guestToken, ourPort] = await Promise.all([
     fetchGuestToken(),
-    mountIframe()
+    mountIframe(),
   ]);
 
-  ourPort.postMessage({ guestToken });
+  ourPort.emit('guestToken', { guestToken });
   log('sent guest token');
 
   function unmount() {
     log('unmounting');
     mountPoint.replaceChildren();
   }
 
+  const getScrollSize = () => ourPort.get<Size>('getScrollSize');
+
   return {
-    unmount
+    getScrollSize,
+    unmount,
   };
 }

superset-embedded-sdk/webpack.config.js

@@ -35,7 +35,7 @@ module.exports = {
   module: {
     rules: [
       {
-        test: /\.ts$/,
+        test: /\.[tj]s$/,
         // babel-loader is faster than ts-loader because it ignores types.
         // We do type checking in a separate process, so that's fine.
         use: 'babel-loader',
@@ -44,6 +44,6 @@ module.exports = {
     ],
   },
   resolve: {
-    extensions: ['.ts'],
+    extensions: ['.ts', '.js'],
   },
 };

superset-frontend/package.json

@@ -108,6 +108,7 @@
     "@superset-ui/plugin-chart-table": "file:./plugins/plugin-chart-table",
     "@superset-ui/plugin-chart-word-cloud": "file:./plugins/plugin-chart-word-cloud",
     "@superset-ui/preset-chart-xy": "file:./plugins/preset-chart-xy",
+    "@superset-ui/switchboard": "file:./packages/superset-ui-switchboard",
     "@vx/responsive": "^0.0.195",
     "abortcontroller-polyfill": "^1.1.9",
     "antd": "^4.9.4",

superset-frontend/packages/superset-ui-switchboard/package.json

@@ -0,0 +1,33 @@
+{
+  "name": "@superset-ui/switchboard",
+  "version": "0.18.25",
+  "description": "Switchboard is a library to make it easier to communicate across browser windows using the MessageChannel API",
+  "sideEffects": false,
+  "main": "lib/index.js",
+  "module": "esm/index.js",
+  "files": [
+    "esm",
+    "lib"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/apache/superset.git"
+  },
+  "keywords": [
+    "switchboard",
+    "iframe",
+    "communication",
+    "messagechannel",
+    "messageport",
+    "postmessage"
+  ],
+  "author": "Superset",
+  "license": "Apache-2.0",
+  "bugs": {
+    "url": "https://github.com/apache/superset/issues"
+  },
+  "homepage": "https://github.com/apache/superset#readme",
+  "publishConfig": {
+    "access": "public"
+  }
+}

superset-frontend/packages/superset-ui-switchboard/src/index.ts

@@ -0,0 +1,20 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+export * from './switchboard';