Merge pull request #94 from chrisbianca/master

Prevent race condition with listenForAuth (iOS)

Author: auser

ios/Firestack/FirestackAuth.h

@@ -15,6 +15,7 @@
 
 @interface FirestackAuth : RCTEventEmitter <RCTBridgeModule> {
     FIRAuthStateDidChangeListenerHandle authListenerHandle;
+    Boolean listening;
 }
 
 @end

ios/Firestack/FirestackAuth.m

@@ -130,6 +130,7 @@ @implementation FirestackAuth
 
 RCT_EXPORT_METHOD(listenForAuth)
 {
+    self->listening = true;
     self->authListenerHandle =
     [[FIRAuth auth] addAuthStateDidChangeListener:^(FIRAuth *_Nonnull auth,
                                                     FIRUser *_Nullable user) {
@@ -174,15 +175,11 @@ @implementation FirestackAuth
 {
     if (self->authListenerHandle != nil) {
         [[FIRAuth auth] removeAuthStateDidChangeListener:self->authListenerHandle];
+        self->listening = false;
         callback(@[[NSNull null]]);
     }
 }
 
-// Helper
-- (Boolean) listeningForAuth {
-  return (self->authListenerHandle != nil);
-}
-
 RCT_EXPORT_METHOD(getCurrentUser:(RCTResponseSenderBlock)callback)
 {
     FIRUser *user = [FIRAuth auth].currentUser;
@@ -496,7 +493,7 @@ - (void) sendJSEvent:(NSString *)title
                props:(NSDictionary *)props
 {
     @try {
-      if ([self listeningForAuth]) {
+      if (self->listening) {
         [self sendEventWithName:title
                            body:props];
       }