Fix parse-community#7340 by correclty computing function name for push event (parse-community#7341)

* Add a failing test for issue parse-community#7340

If any delay occurs after "message.event" assignation in
LiveQueryServer._onAfterSave, the next subscription or request with a different
event might overwrite it, and by that using the wrong "push" function name.

* Remove updade of message and use res.event instead

This prevent computing function name from a
incorrect event if multiple subscriptions override
one by one the message.event.

* Update CHANGELOG.md

* Replace setTimeout by async/await expressions

Author: Perceval Archimbaud

CHANGELOG.md

@@ -130,6 +130,7 @@ ___
 - Fix file upload issue for S3 compatible storage (Linode, DigitalOcean) by avoiding empty tags property when creating a file (Ali Oguzhan Yildiz) [#7300](https://github.com/parse-community/parse-server/pull/7300)
 - Add building Docker image as CI check (Manuel Trezza) [#7332](https://github.com/parse-community/parse-server/pull/7332)
 - Add NPM package-lock version check to CI (Manuel Trezza) [#7333](https://github.com/parse-community/parse-server/pull/7333)
+- Fix incorrect LiveQuery events triggered for multiple subscriptions on the same class with different events [#7341](https://github.com/parse-community/parse-server/pull/7341)
 ___
 ## 4.5.0
 [Full Changelog](https://github.com/parse-community/parse-server/compare/4.4.0...4.5.0)

spec/ParseLiveQueryServer.spec.js

@@ -9,6 +9,8 @@ const queryHashValue = 'hash';
 const testUserId = 'userId';
 const testClassName = 'TestObject';
 
+const timeout = () => jasmine.timeout(100);
+
 describe('ParseLiveQueryServer', function () {
   beforeEach(function (done) {
     // Mock ParseWebSocketServer
@@ -750,10 +752,10 @@ describe('ParseLiveQueryServer', function () {
 
     // Make sure we send command to client, since _matchesACL is async, we have to
     // wait and check
-    setTimeout(function () {
-      expect(client.pushDelete).toHaveBeenCalled();
-      done();
-    }, jasmine.ASYNC_TEST_WAIT_TIME);
+    await timeout();
+
+    expect(client.pushDelete).toHaveBeenCalled();
+    done();
   });
 
   it('has no subscription and can handle object save command', async () => {
@@ -785,14 +787,14 @@ describe('ParseLiveQueryServer', function () {
     parseLiveQueryServer._onAfterSave(message);
 
     // Make sure we do not send command to client
-    setTimeout(function () {
-      expect(client.pushCreate).not.toHaveBeenCalled();
-      expect(client.pushEnter).not.toHaveBeenCalled();
-      expect(client.pushUpdate).not.toHaveBeenCalled();
-      expect(client.pushDelete).not.toHaveBeenCalled();
-      expect(client.pushLeave).not.toHaveBeenCalled();
-      done();
-    }, jasmine.ASYNC_TEST_WAIT_TIME);
+    await timeout();
+
+    expect(client.pushCreate).not.toHaveBeenCalled();
+    expect(client.pushEnter).not.toHaveBeenCalled();
+    expect(client.pushUpdate).not.toHaveBeenCalled();
+    expect(client.pushDelete).not.toHaveBeenCalled();
+    expect(client.pushLeave).not.toHaveBeenCalled();
+    done();
   });
 
   it('can handle object enter command which matches some subscriptions', async done => {
@@ -822,14 +824,14 @@ describe('ParseLiveQueryServer', function () {
     parseLiveQueryServer._onAfterSave(message);
 
     // Make sure we send enter command to client
-    setTimeout(function () {
-      expect(client.pushCreate).not.toHaveBeenCalled();
-      expect(client.pushEnter).toHaveBeenCalled();
-      expect(client.pushUpdate).not.toHaveBeenCalled();
-      expect(client.pushDelete).not.toHaveBeenCalled();
-      expect(client.pushLeave).not.toHaveBeenCalled();
-      done();
-    }, jasmine.ASYNC_TEST_WAIT_TIME);
+    await timeout();
+
+    expect(client.pushCreate).not.toHaveBeenCalled();
+    expect(client.pushEnter).toHaveBeenCalled();
+    expect(client.pushUpdate).not.toHaveBeenCalled();
+    expect(client.pushDelete).not.toHaveBeenCalled();
+    expect(client.pushLeave).not.toHaveBeenCalled();
+    done();
   });
 
   it('can handle object update command which matches some subscriptions', async done => {
@@ -855,14 +857,14 @@ describe('ParseLiveQueryServer', function () {
     parseLiveQueryServer._onAfterSave(message);
 
     // Make sure we send update command to client
-    setTimeout(function () {
-      expect(client.pushCreate).not.toHaveBeenCalled();
-      expect(client.pushEnter).not.toHaveBeenCalled();
-      expect(client.pushUpdate).toHaveBeenCalled();
-      expect(client.pushDelete).not.toHaveBeenCalled();
-      expect(client.pushLeave).not.toHaveBeenCalled();
-      done();
-    }, jasmine.ASYNC_TEST_WAIT_TIME);
+    await timeout();
+
+    expect(client.pushCreate).not.toHaveBeenCalled();
+    expect(client.pushEnter).not.toHaveBeenCalled();
+    expect(client.pushUpdate).toHaveBeenCalled();
+    expect(client.pushDelete).not.toHaveBeenCalled();
+    expect(client.pushLeave).not.toHaveBeenCalled();
+    done();
   });
 
   it('can handle object leave command which matches some subscriptions', async done => {
@@ -892,14 +894,81 @@ describe('ParseLiveQueryServer', function () {
     parseLiveQueryServer._onAfterSave(message);
 
     // Make sure we send leave command to client
-    setTimeout(function () {
-      expect(client.pushCreate).not.toHaveBeenCalled();
-      expect(client.pushEnter).not.toHaveBeenCalled();
-      expect(client.pushUpdate).not.toHaveBeenCalled();
-      expect(client.pushDelete).not.toHaveBeenCalled();
-      expect(client.pushLeave).toHaveBeenCalled();
-      done();
-    }, jasmine.ASYNC_TEST_WAIT_TIME);
+    await timeout();
+
+    expect(client.pushCreate).not.toHaveBeenCalled();
+    expect(client.pushEnter).not.toHaveBeenCalled();
+    expect(client.pushUpdate).not.toHaveBeenCalled();
+    expect(client.pushDelete).not.toHaveBeenCalled();
+    expect(client.pushLeave).toHaveBeenCalled();
+    done();
+  });
+
+  it('sends correct events for object with multiple subscriptions', async done => {
+    const parseLiveQueryServer = new ParseLiveQueryServer({});
+
+    Parse.Cloud.afterLiveQueryEvent('TestObject', () => {
+      // Simulate delay due to trigger, auth, etc.
+      return jasmine.timeout(10);
+    });
+
+    // Make mock request message
+    const message = generateMockMessage(true);
+    // Add mock client
+    const clientId = 1;
+    const client = addMockClient(parseLiveQueryServer, clientId);
+    client.sessionToken = 'sessionToken';
+
+    // Mock queryHash for this special test
+    const mockQueryHash = jasmine.createSpy('matchesQuery').and.returnValue('hash1');
+    jasmine.mockLibrary('../lib/LiveQuery/QueryTools', 'queryHash', mockQueryHash);
+    // Add mock subscription 1
+    const requestId2 = 2;
+    await addMockSubscription(parseLiveQueryServer, clientId, requestId2, null, null, 'hash1');
+
+    // Mock queryHash for this special test
+    const mockQueryHash2 = jasmine.createSpy('matchesQuery').and.returnValue('hash2');
+    jasmine.mockLibrary('../lib/LiveQuery/QueryTools', 'queryHash', mockQueryHash2);
+    // Add mock subscription 2
+    const requestId3 = 3;
+    await addMockSubscription(parseLiveQueryServer, clientId, requestId3, null, null, 'hash2');
+    // Mock _matchesSubscription to return matching
+    // In order to mimic a leave, then enter, we need original match return true
+    // and the current match return false, then the other way around
+    let counter = 0;
+    parseLiveQueryServer._matchesSubscription = function (parseObject) {
+      if (!parseObject) {
+        return false;
+      }
+      counter += 1;
+      // true, false, false, true
+      return counter < 2 || counter > 3;
+    };
+    parseLiveQueryServer._matchesACL = function () {
+      // Simulate call
+      return jasmine.timeout(10).then(() => true);
+    };
+    parseLiveQueryServer._onAfterSave(message);
+
+    // Make sure we send leave and enter command to client
+    await timeout();
+
+    expect(client.pushCreate).not.toHaveBeenCalled();
+    expect(client.pushEnter).toHaveBeenCalledTimes(1);
+    expect(client.pushEnter).toHaveBeenCalledWith(
+      requestId3,
+      { key: 'value', className: 'TestObject' },
+      { key: 'originalValue', className: 'TestObject' }
+    );
+    expect(client.pushUpdate).not.toHaveBeenCalled();
+    expect(client.pushDelete).not.toHaveBeenCalled();
+    expect(client.pushLeave).toHaveBeenCalledTimes(1);
+    expect(client.pushLeave).toHaveBeenCalledWith(
+      requestId2,
+      { key: 'value', className: 'TestObject' },
+      { key: 'originalValue', className: 'TestObject' }
+    );
+    done();
   });
 
   it('can handle update command with original object', async done => {
@@ -936,15 +1005,15 @@ describe('ParseLiveQueryServer', function () {
     parseLiveQueryServer._onAfterSave(message);
 
     // Make sure we send update command to client
-    setTimeout(function () {
-      expect(client.pushUpdate).toHaveBeenCalled();
-      const args = parseWebSocket.send.calls.mostRecent().args;
-      const toSend = JSON.parse(args[0]);
+    await timeout();
 
-      expect(toSend.object).toBeDefined();
-      expect(toSend.original).toBeDefined();
-      done();
-    }, jasmine.ASYNC_TEST_WAIT_TIME);
+    expect(client.pushUpdate).toHaveBeenCalled();
+    const args = parseWebSocket.send.calls.mostRecent().args;
+    const toSend = JSON.parse(args[0]);
+
+    expect(toSend.object).toBeDefined();
+    expect(toSend.original).toBeDefined();
+    done();
   });
 
   it('can handle object create command which matches some subscriptions', async done => {
@@ -970,14 +1039,14 @@ describe('ParseLiveQueryServer', function () {
     parseLiveQueryServer._onAfterSave(message);
 
     // Make sure we send create command to client
-    setTimeout(function () {
-      expect(client.pushCreate).toHaveBeenCalled();
-      expect(client.pushEnter).not.toHaveBeenCalled();
-      expect(client.pushUpdate).not.toHaveBeenCalled();
-      expect(client.pushDelete).not.toHaveBeenCalled();
-      expect(client.pushLeave).not.toHaveBeenCalled();
-      done();
-    }, jasmine.ASYNC_TEST_WAIT_TIME);
+    await timeout();
+
+    expect(client.pushCreate).toHaveBeenCalled();
+    expect(client.pushEnter).not.toHaveBeenCalled();
+    expect(client.pushUpdate).not.toHaveBeenCalled();
+    expect(client.pushDelete).not.toHaveBeenCalled();
+    expect(client.pushLeave).not.toHaveBeenCalled();
+    done();
   });
 
   it('can handle create command with fields', async done => {
@@ -1020,14 +1089,14 @@ describe('ParseLiveQueryServer', function () {
     parseLiveQueryServer._onAfterSave(message);
 
     // Make sure we send create command to client
-    setTimeout(function () {
-      expect(client.pushCreate).toHaveBeenCalled();
-      const args = parseWebSocket.send.calls.mostRecent().args;
-      const toSend = JSON.parse(args[0]);
-      expect(toSend.object).toBeDefined();
-      expect(toSend.original).toBeUndefined();
-      done();
-    }, jasmine.ASYNC_TEST_WAIT_TIME);
+    await timeout();
+
+    expect(client.pushCreate).toHaveBeenCalled();
+    const args = parseWebSocket.send.calls.mostRecent().args;
+    const toSend = JSON.parse(args[0]);
+    expect(toSend.object).toBeDefined();
+    expect(toSend.original).toBeUndefined();
+    done();
   });
 
   it('can match subscription for null or undefined parse object', function () {
@@ -1737,7 +1806,8 @@ describe('ParseLiveQueryServer', function () {
     clientId,
     requestId,
     parseWebSocket,
-    query
+    query,
+    customQueryHashValue
   ) {
     // If parseWebSocket is null, we use the default one
     if (!parseWebSocket) {
@@ -1765,12 +1835,12 @@ describe('ParseLiveQueryServer', function () {
     // Make mock subscription
     const subscription = parseLiveQueryServer.subscriptions
       .get(query.className)
-      .get(queryHashValue);
+      .get(customQueryHashValue || queryHashValue);
     subscription.hasSubscribingClient = function () {
       return false;
     };
     subscription.className = query.className;
-    subscription.hash = queryHashValue;
+    subscription.hash = customQueryHashValue || queryHashValue;
     if (subscription.clientRequestIds && subscription.clientRequestIds.has(clientId)) {
       subscription.clientRequestIds.get(clientId).push(requestId);
     } else {

spec/helper.js

@@ -515,3 +515,5 @@ jasmine.restoreLibrary = function (library, name) {
   }
   require(library)[name] = libraryCache[library][name];
 };
+
+jasmine.timeout = t => new Promise(resolve => setTimeout(resolve, t));

src/LiveQuery/ParseLiveQueryServer.js

@@ -298,7 +298,6 @@ class ParseLiveQueryServer {
             } else {
               return null;
             }
-            message.event = type;
             res = {
               event: type,
               sessionToken: client.sessionToken,
@@ -334,8 +333,7 @@ class ParseLiveQueryServer {
               originalParseObject = res.original.toJSON();
               originalParseObject.className = res.original.className || className;
             }
-            const functionName =
-              'push' + message.event.charAt(0).toUpperCase() + message.event.slice(1);
+            const functionName = 'push' + res.event.charAt(0).toUpperCase() + res.event.slice(1);
             if (client[functionName]) {
               client[functionName](requestId, currentParseObject, originalParseObject);
             }