Channels: channel_layer appears to time out

[oper...@tobyz.net]

Hello,

I have a project that uses Channels as a worker queue, with a SyncConsumer that runs a heavy computation task. This works great.

I transitioned the project to have a 'task in process' page that opens a websocket and through the magic of channel's groups it gets pushed the computation updates as they happen. This works great.

I'm now transitioning the project to be a single-page-app that communicates via a websocket. Using `runserver`, this works great, the websocket stays open. However, the messages from the SyncConsumer stop after a few seconds. I've established that time is whatever the value of `websocket_handshake_timeout` is, but this doesn't make sense to me AFAIK as the channel_layer is independent from the JsonWebsocketConsumer instance, and the websocket is happily connected and still passing messages.

Any ideas? Is this a bug or am I doing something wrong? 

Thanks,

Toby

[Andrew Godwin]

Hi Toby,

Do you have the latest versions of daphne, channels, asgiref and channels_redis? This sounds supiciously like a bug I fixed a couple weeks ago.

Andrew

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[oper...@tobyz.net]

Andrew,

Thanks for taking the time to reply. 

In classic fashion, the issue has gone away and I'm not entirely sure why. I suspect there might have been a page with older code buried somewhere, trying to do websocket things wrongly, and that was throwing things off. I'm sure it will rear it's head again, and if it does I will try and get a reproducible test case.

Toby

On Thursday, March 1, 2018 at 9:48:59 PM UTC, Andrew Godwin wrote:

Hi Toby,

Do you have the latest versions of daphne, channels, asgiref and channels_redis? This sounds supiciously like a bug I fixed a couple weeks ago.

Andrew

On Thu, Mar 1, 2018 at 5:45 AM, <oper...@tobyz.net> wrote:

Hello,

I have a project that uses Channels as a worker queue, with a SyncConsumer that runs a heavy computation task. This works great.

I transitioned the project to have a 'task in process' page that opens a websocket and through the magic of channel's groups it gets pushed the computation updates as they happen. This works great.

I'm now transitioning the project to be a single-page-app that communicates via a websocket. Using `runserver`, this works great, the websocket stays open. However, the messages from the SyncConsumer stop after a few seconds. I've established that time is whatever the value of `websocket_handshake_timeout` is, but this doesn't make sense to me AFAIK as the channel_layer is independent from the JsonWebsocketConsumer instance, and the websocket is happily connected and still passing messages.

Any ideas? Is this a bug or am I doing something wrong? 

Thanks,

Toby

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[toby @ tobyz]

Update: there was an issue, and running the stock Ubuntu 16.04 Python was the cause; 3.5.2.

I’ve provisioned 3.6.4, and channels is doing exactly what I ask of it.

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