simplify websocket opening and response types from BE

client/lib/patch-db.ts

@@ -2,43 +2,35 @@ import { EMPTY, merge, Observable, ReplaySubject, Subject } from 'rxjs'
 import { catchError, switchMap } from 'rxjs/operators'
 import { Store } from './store'
 import { DBCache, Http } from './types'
-import { RPCError } from './source/ws-source'
 import { Source } from './source/source'
 
 export class PatchDB<T> {
   public store: Store<T> = new Store(this.http, this.initialCache)
-  public connectionError$ = new Subject<Error>()
-  public rpcError$ = new Subject<RPCError>()
+  public connectionError$ = new Subject<any>()
   public cache$ = new ReplaySubject<DBCache<T>>(1)
 
-  private sub = this.sources$
-    .pipe(
-      switchMap(sources =>
-        merge(...sources.map(s => s.watch$(this.store))).pipe(
-          catchError(e => {
-            this.connectionError$.next(e)
-
-            return EMPTY
-          }),
-        ),
-      ),
-    )
-    .subscribe(res => {
-      if ('result' in res) {
-        this.store.update(res.result)
-        this.cache$.next(this.store.cache)
-      } else {
-        this.rpcError$.next(res)
-      }
-    })
-
   constructor(
     private readonly sources$: Observable<Source<T>[]>,
     private readonly http: Http<T>,
     private readonly initialCache: DBCache<T>,
   ) {}
 
-  clean() {
-    this.sub.unsubscribe()
+  ngOnInit() {
+    this.sources$
+      .pipe(
+        switchMap(sources =>
+          merge(...sources.map(s => s.watch$(this.store))).pipe(
+            catchError(e => {
+              this.connectionError$.next(e)
+
+              return EMPTY
+            }),
+          ),
+        ),
+      )
+      .subscribe(res => {
+        this.store.update(res)
+        this.cache$.next(this.store.cache)
+      })
   }
 }