Problem with setup LiveQuery to work with Flutter

Question

i have seen many tutorials how to setup LiveQuery (most of them were prepared for back4app servers) However i found some tutorials made for self hosted servers and there was something like "index.js" which I believe is in this app "app.js". I've put like this code inside of var api = new ParseServer({...

liveQuery: {
    classNames: ["Test"] //List of classes to support for query subscritions
},

and after that I put this:

var app = express();
app.use('/', api);
let httpServer = require('http').createServer(app);
httpServer.listen(1337);
var parseLiveQueryServer = ParseServer.createLiveQueryServer(httpServer);

Still doesn't work and I'm not even sure how this url liveQueryUrl: keyLiveQueryUrl looks like.

According to flutter doc's https://pub.dev/packages/parse_server_sdk_flutter i need this to use Live Query.

It's hosted on http so as I know it's:

ws://myIP:port/appname/ <---Like this?

For example in this parser there's index.js with pre setup live query https://github.com/parse-community/parse-server-example/blob/master/index.js I've tried to copy some code to my app.js in many variation but couldn't handle it.

It would be good if you could share the complete code that you are using to run the server, the code that you are using to connect and the error you have. By default, the address for the live query server will be the same of your parse server, but with ws instead of http or wss instead of https. — Davi Macêdo
– Davi Macêdo, Commented Aug 25, 2021 at 14:08
Some logs from today: {"code":"EADDRINUSE","errno":"EADDRINUSE","syscall":"listen","address":"::","port":1337,"level":"error","timestamp":"2021-08-26T08:28:48.288Z"} — Adrian Zalewski
– Adrian Zalewski, Commented Aug 26, 2021 at 13:33
The code looks good. Have you tried to initialize the sdk in the way I suggested to you? — Davi Macêdo
– Davi Macêdo, Commented Aug 27, 2021 at 17:39
@DaviMacêdo My parser is "http", so You mean I need to initialize this like ws://IP:PORT/appname yes? but i set this port 1337 manually I'm not sure if this going to work on it. — Adrian Zalewski
– Adrian Zalewski, Commented Aug 28, 2021 at 8:52

Shaido · Accepted Answer · 2021-08-31 09:46:23Z

0

So i finally find out the problem. The problem was this port 1337 that i wanted to use was blocked by default. I checked list of free ports, change it to the other port and now I'm connected:

I/flutter (20494): LiveQuery: : Listen: {"op":"connected","clientId":"1437a932-c260-45b8-a567-417127f68efd"}
I/flutter (20494): ReSubScription:{}
I/flutter (20494): LiveQueryReconnectingController: LiveQueryClientEvent.CONNECTED
I/flutter (20494): LiveQuery: : SubscribeMessage: {op: subscribe, requestId: 1, query: {className: Test, where: {intNumber: 1}}}
I/flutter (20494): LiveQuery: : Listen: {"op":"subscribed","clientId":"1437a932-c260-45b8-a567-417127f68efd","requestId":1}

edited Aug 31, 2021 at 9:46

Shaido

28.6k26 gold badges76 silver badges82 bronze badges

answered Aug 31, 2021 at 9:26

Adrian Zalewski

477 bronze badges

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