add loadHistory method

src/app/services/socket/rocket-chat-client.service.ts

@@ -5,7 +5,10 @@ import { wsCallbacksParams, msgQueue } from 'src/app/models/rochet-chat-cliente-
 /**
  * Use this class to interact with rocketChat realtime API
  */
-class _RocketChatClientService {
+@Injectable({
+  providedIn: 'root'
+})
+export class RocketChatClientService {
 
   private hasPing = false
   private firstPingFunx: Function
@@ -163,6 +166,37 @@ class _RocketChatClientService {
     });
   }
 
+  loadHistory(roomId, limit: number = 50) {
+    const conditions = this.attemptRequestQueue({...roomId, limit}, {methodName:'loadHistory'})
+    if(conditions == false) { return new Promise((resolve, reject) => { reject('no error')}); }
+
+    const requestId =  uuidv4()
+
+    const request = {
+      msg: "method",
+      method: "loadHistory",
+      id: requestId,
+      params: [ 
+        roomId, 
+        null, 
+        limit, 
+        { 
+          "$date": 1480377601 
+        } 
+      ]
+    }
+
+    this.ws.send(request, requestId)
+
+
+    // return new Promise((resolve, reject) => {
+    //   this.ws.registerCallback({type:'Onmessage', requestId, runOnces: true, funx:(message)=>{
+    //     if(message.id == requestId || message.result.id == requestId) { // same request send
+    //       resolve(message)
+    //     }
+    //   }})
+    // });
+  }
 
   subscribe(roomId : string) {
 
@@ -281,7 +315,7 @@ class _RocketChatClientService {
 
   private ws = {
     connected: false,
-    registerCallback:(params: wsCallbacksParams) =>{
+    registerCallback:(params: wsCallbacksParams) => {
       
       if(!params.requestId) {
         params.requestId = uuidv4()
@@ -363,7 +397,4 @@ class _RocketChatClientService {
 
   }
 
-}
-
-
-export const RocketChatClientService = new _RocketChatClientService()
+}