send offline message

src/app/module/chat/infra/socket/signal-r.service.ts

@@ -1,5 +1,5 @@
 import { Injectable } from '@angular/core';
-import { BehaviorSubject, Subject, timer } from 'rxjs';
+import { BehaviorSubject, Observable, Subject, timer } from 'rxjs';
 import { Platform } from '@ionic/angular';
 import { SignalRConnection } from './signalR';
 import { Plugins } from '@capacitor/core';
@@ -102,6 +102,16 @@ export class SignalRService {
         this.sendDataSubject.next(data)
         this.deadConnectionBackGround.next()
       })
+
+      this.connection.getConnectionState().subscribe((data) => {
+        this.connectingSubject.next(data)
+      })
+    } else {
+
+      setTimeout(() => {
+        this.establishConnection()
+      }, 2000)
+
     }
 
   }
@@ -131,6 +141,9 @@ export class SignalRService {
   getData() {
     return this.sendDataSubject.asObservable()
   }
+  public getConnectionState(): Observable<boolean> {
+    return this.connectingSubject.asObservable();
+  }
 
   async sendMessage(data: Object) {
     return await this.connection.sendMessage(data as any)

src/app/module/chat/infra/socket/signalR.ts

@@ -27,6 +27,7 @@ export class SignalRConnection {
   private sendDataSubject: BehaviorSubject<{method: string, data: any}> = new BehaviorSubject<{method: string, data: any}>(null);
   private pendingRequests: Map<string, { resolve: Function; reject: Function }> = new Map();
   url: string
+  private hasConnectOnce = false
 
   constructor({url}) {
     this.url = url
@@ -44,6 +45,7 @@ export class SignalRConnection {
       hubConnection
       .start()
       .then(() => {
+        this.hasConnectOnce = true
         console.log('Connection started');
         this.connectionStateSubject.next(true);
         this.hubConnection = hubConnection
@@ -54,7 +56,13 @@ export class SignalRConnection {
       .catch(error => {
         console.log('Error while starting connection: ' + error);
         this.connectionStateSubject.next(false);
-        reject(err(false))
+
+        if(this.hasConnectOnce) {
+          setTimeout(()=> {
+            this.attempReconnect();
+          }, 2000)
+        }
+        resolve(err(false))
       });
 
       hubConnection.onclose(() => {
@@ -64,7 +72,7 @@ export class SignalRConnection {
 
         this.pendingRequests.forEach((_, requestId) => {
           const { reject } = this.pendingRequests.get(requestId);
-          reject(err('Connection closed================!s'));
+          reject(err(false));
           this.pendingRequests.delete(requestId);
         });