logux/logux

cosminv6u

@cosminv6u

@euaaaio the only difference of the servers is that the Dev one uses wss, the local server uses ws

Eduard Aksamitov

@euaaaio

What does the server log show?

cosminv6u

@cosminv6u

INFO Client was disconnected at 2020-08-27 12:55:50
Node ID: 1....

INFO Client was connected at 2020-08-27 12:55:51
Connection ID: 16
IP address: 1...

Around each 40 seconds

cosminv6u

@cosminv6u

I see a new connection being created in the Chrome>DevTools>Network> each 1 minute.

I restarted the Logux Proxy Server and it behaves the same

Doesn't matter on what page I am so I think the reason is not bad code

Maybe a network issue 🤔

12 replies

Alexey Naumov

@anaumov

Hey, guys! I try to build a simple app with rails backend but faild with this. The connection from client goes to proxy and rails well, but when I try to add something to logs proxy does not receive any message.

I suspect that client does not send action to server. What I did wrong? client send action code below

loguxClient.log.add({
    type: 'question/pick',
    payload
  });

11 replies

Alexey Naumov

@anaumov

Guys, what about auth for logux-rails+devise? Do I need to implement JWT and use it like I saw in example https://logux.io/guide/concepts/node/#authentication or you have 'in box' solution for devise somewhere?

3 replies

Neville Franks

@getclibu_twitter

I've got an issue with client Log entries being ignored. Here's the steps:
1) Client is offline
2) Client does CRUD actions which are added to the log.
3) Client Signs Out of app.
4) Client Signs In to App and connects to the server.
4a) This does log.add( { "signin" } with user = "anonymous" which is added to the log.
4b) Client connects to server, auth is done and client does syncSince()
4c) syncSince() -> syncSinceQuery() -> outFilter() matches the "anonymous" signin log entry and discards the earlier unsent crud log items.

15 replies

Neville Franks

@getclibu_twitter

@ai Did you see my reply?

Bobrov Dmitry

@bobredobre_gitlab

Привет! У нас есть клиент (Vue) и сервер (nodejs) на logux, сервер работает с PostgreSQL. Помимо logux сервера есть административная панель с SSR на php, которая работает с той же БД. Мы столкнулись со следующей проблемой: нам нужно по изменению, например, ролей пользователя, из административной панели отправить сообщение в channel. Похоже, что выходом будет поднятие вместе с logux сервером на nodejs рядом http сервера (express) и принятие сообщений от PHP событий и отправка их в logux channels. Подскажи, есть ли возможность вне описания экшнов и каналов отправлять экшны в каналы (например, из обработчика express)?

4 replies

cosminv6u

@cosminv6u

Hi, is there some documentation about what's currently missing in Logux to support CRDT 100%?

And what's logux-data? (issue #11)

5 replies

Mario Meisenberger

@laborc8

Hi. It seams that logux is exactly what I was looking for. :) Great work I have to say - congrats! Can I use logux with angular? I already use a state tool (aktia) - Can I combine them? Is there any example server and client? I need to connect to php rest api (as backend) via server - is this doable. Are there any other projects like logux? So many questions :) I hope you can help me there - thanks

19 replies

nnn3d

@nnn3d

Привет! Обнаружил проблему с рассинхронизацией после обрыва интернета. На фронте есть subscribe на channel сущности (character), load (на сервере) которого отдает всю сущность целиком. Последовательность такая:

Отключается интернет
Выполняется действие - добавляется action (setRaceChoice), который меняет одно поле данной сущности
Включается интернет
Одновременно отправляются 2 запроса - отправка setRaceChoice и подписка на channel character
Соответственно, setRaceChoice не успевает обработаться до того, как прилетает load от channel character - и приходят устаревшие данные

Используется NoSQL БД - нормальную блокировку сделать проблематично
WS лог выглядит так - http://prntscr.com/us7lok
Есть ли возможность это решить?

7 replies

Gunnar Beutner

@gunnarbeutner

Hello, I've run into a problem and I'm not sure if it's a known bug or some issue with my own code:

Client is offline and subscribed to the "groups" channel.
Client updates an existing group (add_group action, stored locally for now).
Client reconnects.
Server processes add_group - but it takes a while (async DB query).
Server sees client's subscription and sends add_group actions for groups (in the channel's load function)
Server finishes processing the client's add_group message.

Because the DB query hasn't finished yet step 6 sends outdated group information. This seems to happen no matter whether my load/process functions are async or not. Is this what's being addressed by logux/logux#54

4 replies

cosminv6u

@cosminv6u

Hi, I'm coming back with an old issue we have. We use Logux Proxy and expose Rest Endpoints using Spring Boot Java. We want all the incoming rest requests to contain the Auth token we send from UI. This token is sent with the AUTH Action, but it's not sent with subsequent actions. Putting a firewall and whitelist the Logux Proxy is not an option because in that token we have more data, not only for authentication. We use Logux Vuex. Can we somehow intercept the outgoing WebSocket Messages and add in the meta the token? I don't want to use vanilla JS Logux, as I like Logux Vuex. I think it's a very common requirement for Spring Boot, so it might be helpful. I can help with the Logux code if you want.

85 replies

cosminv6u

@cosminv6u

Or Logux Proxy can keep in memory the Token and send it with every request. That would be the best

cosminv6u

@cosminv6u

Hello @ai, we started to rewrite Logux Core and Logux Server in Java, as we don't want to use Logux Proxy anymore.

It would be nice if you can give us a small guidance of what needs to be done. Right now we're using the documentation and we reverse engineer the JavaScript code, but it's a little bit hard for us.

I know we need to take care of each nodes time, put logs in order and so on. Maybe we can create on gitter a separate channel and have a longer discussion

7 replies

Maksim Semenov

@maksimsemenov

Hi, is it possible to change token on the logux client without changing user? Let's say I have an authentication token, that is about to expire, and I want to refresh it and replace it on logux client. I found only changeUser user method, that I might use, but I don't want to disconnect/reconnect, etc.

14 replies

Imad Bouziani

@imadbz

I am considering Logux for a production project. I have couple questions:

What happens to the state if server crashes? How about actions that are not processed yet?
How do you scale servers?

2 replies

Eduard Aksamitov

@euaaaio

Server state is what you have in your database. Nothing more. And I think, after server crush, client will save all actions in the log, that will be processed after reconnection.
“Logux is based on the offline-first idea. If the node is offline right now, new actions will wait for a connection in the node’s log. Offline is a standard mode for Logux application.”

Logux Server Pro: https://logux.io/guide/architecture/parts/

cosminv6u

@cosminv6u

Hi, I created some tests to see how Logux resend actions to different browser instances. I used webdriver.io and for some reason I get some racing conditions. Some WD disconnect as well.

40 replies

My backend is NodeJs, I implemented increment and decrement (the Counter) example.

When I test it manually it works fine. When I run each testcase individually it works fine. But when I run all 8 test cases, sometimes they fail, always different, there's no rule.

cosminv6u

@cosminv6u

Is there a way to disconnect the client without losing the logs? I want to do some tests with offline mode. And I see Chrome doesn't disconnect the WS when set to offline mode.. there's a bug since 2014 for that

1 reply

https://bugs.chromium.org/p/chromium/issues/detail?id=423246

cosminv6u

@cosminv6u

Hi again 😁 I was doing some tests with 2 browsers updating the same thing in offline mode. I was expecting LWW, but for some reason it seems that it matters who's getting online first, instead of the absolute order of the actions in time. Also when going online they don't have the same value..

43 replies

UseCase1: OK

B1 -> Logux
B2 = Logux
B1 OFF
B1 -> Logux2
B2 OFF
B2 -> Logux3
B1 ON
B2 ON
B1 = Logux3
B2 = Logux3

UseCase2: NOK

B1 -> Logux
B2 = Logux
B1 OFF
B1 -> Logux2
B2 OFF
B2 -> Logux3
B2 ON
B1 ON
B1 = Logux2 !NOK!
B2 = Logux3

Imad Bouziani

@imadbz

Hi , Technical question here, I wonder how you solved it before.

I am subscribing to a channel: users/:id, it might respond with the userData or deniedAccess or notFound.
In case I get the data, I can just show a loader until the data shows up in the frontend, however, how do I handle the other two cases since Logux only respond with a logux/undo event

I am new to CRDT architectures, I am sure its an obvious one but I couldn't think of a solution yet!

thanks a lot.

4 replies

asedsami

@asedsami

Hi I'm having a 'WS Error' which is seen only in development mode. I was wondering how can I catch that error in redux and let the user know that they're offline in production mode? thank you for any help you are able to provide.

4 replies

asedsami

@asedsami

Pouchdb uses Couchdb and there's no need to write server code like in logux(server.type) and the browser can connect to the Database directly which makes developing apps faster. but pouchdb does not resolve conflicts automatically and I don't wanna show the conflict to the user. I would also like to understand what's going on and have full control and that's the reason I'd like to implement the app in logux instead of pouchdb. say I create an Offline First Todo App. in two offline devices, I edit and change the title of the first todo, when they both go online, what should happen to the title? Is CRDT(and logux) the solution to this problem? 'likes/add' is an atomic action whereas 'likes/set' isn't, what could be the atomic action for editing text in a todo or in a note app?

11 replies

asedsami

@asedsami

In logux's Docs I found a missing comma. I couldn't edit and add the comma. I checked all document pages. in these four pages, the edit buttons don't link to the related markdown file: Redux API, Vuex API, Node API, Branding.

Maksim Semenov

@maksimsemenov

I'm trying to implement an optimistic update pattern with some store on the client. When I add an action to the logux, I apply this action to the store (I'm trying to use storeon). Then if the action fails, I receive a logux/undo action from the server. I'm trying to get this action from logux store and revert the changes in the store.

The problem is that, if I'm trying to listen for logux/undo in log.on('add') and use log.byId, the original action is no longer in log, because it was already cleared. So I can not use it to revert my changes in store.
When I'm trying to listen for logux/undo in log.on('preadd'), the logux/undo is fired only for the leading tab and is not fired in other tabs.

So what would be a canonical way to revert optimistic updates in multiple tabs?

8 replies

Alexey A. Zabaykalsky

@AlexQuidditch

Hi everyone! How can I use Logux to create connection between Node.js apps? No browser, only for servers.

4 replies

Maksim Semenov

@maksimsemenov

What will be the approach for implementing continuous deployment? How can I persist the server log during deployment? Is there any built-in solution? Is it a use case for Logux Pro?

4 replies

Maldaris

@Maldaris

I see Logux Pro being referenced in regard to scaling support, does that mean that Logux doesn't play well with Node.js' cluster native module?

3 replies

Matthew O'Riordan

@mattheworiordan_twitter

This project looks amazing, kudos to the evil martian team and contributors. Are there any plans in supporting other languages, specifically mobile targets like Android, iOS, .NET? I see you have defined Protocols in your docs (+1), however that's AFAICT defining the protocol, and how an SDKs would need to be implemented I assume is a very different task if no spec exists (i.e. replicating what exists is one thing, but keeping it in sync is extremely hard). What are your thoughts on this?

4 replies

Maksim Semenov

@maksimsemenov

I have a question about action processing on the server. We have access, resend and process callbacks. And resend is called before the process. I'm curious, what was the reasoning behind that?

The use case that I have in mind, is that if the process callback fails (error while saving to the database, or maybe an error in some API call), I will need to send an undo action to all notified clients and revert it on them. I think that in this use case, resending action after it was successfully processed might be more efficient and will require less work.

Also, a related use case is data validation. When using validation schema (like joi) it allows to validate incoming data and remove all unknown keys (sort of "sanitize" payload). And with the current order of callbacks, it is not clear where to put this validation:

If we put it in the access callback, then we have to somehow pass the sanitized payload to the process (passing it in ctx alongside the action seems wacky, but at the same mutating an action seems like a bad idea as well).
if we put it in process we might end up with a lot of validation exceptions and a little bit of hustle reverting this action on all clients.

So I wonder what are the author's thoughts on that?

3 replies

Honza

@hfnukal

Hi, Logux is great, i love it. ;) I am integrating Logux server as Nuxt module. It works, but I needed to skip bind-control-server. Sync wors using ws but I am not sure if I miss some features. Is it possible to map Logux to some uri (eg /logux) so it is not colide with other services?

3 replies

friesendrywall

@friesendrywall

A few things about nodjs server that aren’t clear to me.. #1 does logux_backend mean an express back end for example? I’d like to make this coexist with express. #2 can sockjs be used as a transport, or is there some equivalent I have missed? #3 how would I go about triggering an external event? For example, something that would trigger a resend event, like something that came in on rest or mqtt?

49 replies

Honza

@hfnukal

Dirty hack for running http:

import { Server } from '@logux/server';

// fake http to avoid Logux on server /
const fakehttp = { on: (event, cb) => console.log('FAKE HTTP: ', event, cb) };
const logux = new Server(
  Server.loadOptions(process, {
    subprotocol: '1.0.0',
    supports: '1.x',
    root: __dirname,
    fakehttp,
  }),
);
logux.ws = new WebSocket.Server({ noServer: true });
// hack to http
http.on('upgrade', (request, socket, head) => {
  logux.ws.handleUpgrade(request, socket, head, (ws) => {
    logux.ws.emit('connection', ws);
  });
});
// apply server module
logux.listen();

Cosmin Vacaroiu

@cosmin.vacaroiu_gitlab

Hi, I have a question regarding Logux Proxy. Inside the Proxy when a user is disconnected I see log INFO Client was disconnected at 2021-01-26 21:33:42 but there's no call from Proxy to Backend to inform that this happened. I need to do some cleanups on the Backend when a user disconnects. Is it possible? 10x

16 replies

ps: I'm cosminv6u but I can't log in with github ... so i used gitlab

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