Initial Move from Azure DevOps to GitHub

src/Common/MessageHandler.ts

@@ -0,0 +1,85 @@
+import { MessageTypes } from "../Contracts/ExplorerContracts";
+import Q from "q";
+import * as _ from "underscore";
+import * as Constants from "./Constants";
+
+export interface CachedDataPromise<T> {
+  deferred: Q.Deferred<T>;
+  startTime: Date;
+  id: string;
+}
+
+/**
+ * For some reason, typescript emits a Map() in the compiled js output(despite the target being set to ES5) forcing us to define our own polyfill,
+ * so we define our own custom implementation of the ES6 Map to work around it.
+ */
+type Map = { [key: string]: CachedDataPromise<any> };
+
+export class MessageHandler {
+  protected static RequestMap: Map = {};
+
+  public static handleCachedDataMessage(message: any): void {
+    const messageContent = message && message.message;
+    if (
+      message == null ||
+      messageContent == null ||
+      messageContent.id == null ||
+      !MessageHandler.RequestMap[messageContent.id]
+    ) {
+      return;
+    }
+
+    const cachedDataPromise = MessageHandler.RequestMap[messageContent.id];
+    if (messageContent.error != null) {
+      cachedDataPromise.deferred.reject(messageContent.error);
+    } else {
+      cachedDataPromise.deferred.resolve(JSON.parse(messageContent.data));
+    }
+    MessageHandler.runGarbageCollector();
+  }
+
+  public static sendCachedDataMessage<TResponseDataModel>(
+    messageType: MessageTypes,
+    params: Object[],
+    timeoutInMs?: number
+  ): Q.Promise<TResponseDataModel> {
+    let cachedDataPromise: CachedDataPromise<TResponseDataModel> = {
+      deferred: Q.defer<TResponseDataModel>(),
+      startTime: new Date(),
+      id: _.uniqueId()
+    };
+    MessageHandler.RequestMap[cachedDataPromise.id] = cachedDataPromise;
+    MessageHandler.sendMessage({ type: messageType, params: params, id: cachedDataPromise.id });
+
+    //TODO: Use telemetry to measure optimal time to resolve/reject promises
+    return cachedDataPromise.deferred.promise.timeout(
+      timeoutInMs || Constants.ClientDefaults.requestTimeoutMs,
+      "Timed out while waiting for response from portal"
+    );
+  }
+
+  public static sendMessage(data: any): void {
+    if (MessageHandler.canSendMessage()) {
+      window.parent.postMessage(
+        {
+          signature: "pcIframe",
+          data: data
+        },
+        window.document.referrer
+      );
+    }
+  }
+
+  public static canSendMessage(): boolean {
+    return window.parent !== window;
+  }
+
+  protected static runGarbageCollector() {
+    Object.keys(MessageHandler.RequestMap).forEach((key: string) => {
+      const promise: Q.Promise<any> = MessageHandler.RequestMap[key].deferred.promise;
+      if (promise.isFulfilled() || promise.isRejected()) {
+        delete MessageHandler.RequestMap[key];
+      }
+    });
+  }
+}