Merge branch 'master' into collaboration-sarah

1 files changed, 37 insertions, 0 deletions

diff --git a/src/client/util/PingManager.ts b/src/client/util/PingManager.ts
new file mode 100644
index 000000000..0c41a1ea7
--- /dev/null
+++ b/src/client/util/PingManager.ts
@@ -0,0 +1,37 @@
+import { action, observable } from 'mobx';
+import { Networking } from '../Network';
+export class PingManager {
+    // create static instance and getter for global use
+    @observable static _instance: PingManager;
+    static get Instance(): PingManager {
+        return PingManager._instance;
+    }
+
+    @observable IsBeating = true;
+    private setIsBeating = action((status: boolean) => {
+        this.IsBeating = status;
+        setTimeout(this.showAlert, 100);
+    });
+
+    showAlert = () => {
+        alert(PingManager.Instance.IsBeating ? 'The server connection is active' : 'The server connection has been interrupted.NOTE: Any changes made will appear to persist but will be lost after a browser refreshes.');
+    };
+    sendPing = async (): Promise<void> => {
+        try {
+            await Networking.PostToServer('/ping', { date: new Date() });
+            !this.IsBeating && this.setIsBeating(true);
+        } catch {
+            if (this.IsBeating) {
+                this.setIsBeating(false);
+            }
+        }
+    };
+
+    // not used now, but may need to clear interval
+    private _interval: NodeJS.Timeout | null = null;
+    INTERVAL_SECONDS = 1;
+    constructor() {
+        PingManager._instance = this;
+        this._interval = setInterval(this.sendPing, this.INTERVAL_SECONDS * 1000);
+    }
+}