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Fix #65: allow excluding all sockets in a room #66

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merged 2 commits into from
Feb 26, 2021

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sebamarynissen
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This PR adds a fix for #65 which allows excluding all sockets in a specific room when broadcasting.

@darrachequesne
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Hi! Thanks for the pull request.

If I understand correctly, this will allow to do:

io.except(<room>).emit(/* ... */);
socket.broadcast.except(<room>).emit(/* ... */);

I'm wondering if it would make sense to also add:

io.to(<room1>).except(<room2>).emit(/* ... */);
socket.to(<room1>).except(<room2>).emit(/* ... */);

What's your opinion on this?

Related: socketio/socket.io#3657

@sebamarynissen
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sebamarynissen commented Feb 2, 2021

I did not add an .except() method to the namespace and socket classes yet, but indeed that would be possible. I can add it and file a PR for this in https://github.com/socketio/socket.io if you'd like. I didn't add it because in my use case I'm doing some wizardry where I directly call adapter.broadcast() instead of using io.to(). It will definitely make it more useful though to explicitly add an .except() method to the namespace and socket classes too.

As for the io.to(<room1>).except(<room2>).emit(/* ... */) case, I did think about that as well and it should be possible by just moving the code I added out of the else statement. l did not do it because I thought it might be too confusing to mix too many rooms (as you'd be able to go real exotic like io.to(...).to(...).except(...).to(...).except(...)). However, the more I think of it, the more I am convinced that it would be better to allow it though.

Furthermore, I think that this functionality should be added to socket.io-emitter as well. I already created an issue for this a while ago (socketio/socket.io-redis-emitter#87), but I'll file a PR for that as well. It's just a matter of adding an .except() method.

As a conclusion, I propose that I do the following, if you agree:

@darrachequesne
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Sounds good to me 👍

@sebamarynissen
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@darrachequesne I've created all required pull requests in their respective repositories. I should note that I would still like to add tests for excluding specific rooms as well, but for that to work socket.io first needs to use an adapter containing this functionality of course.

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2 participants