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django channels with redis: messages created before websocket connection established are lost
Django - How to track if a user is online/offline in realtime?Sending messages to django-channels via celeryDjango Channels Websockets Connecting and Disconnecting right awayBest practice for Websocket authentification - Django ChannelsUsing Django Channels to send info to all connected clientsDjango channels websocket disconnects after handshakeDjango Channels send message from python websocket-client moduleHow should I configure Redis for Django Channels 2.0?Django websockets with RedisDjango channels redis channel layer opens a lot of connectionssending message to client using Django Channels from Celery tasks.py
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
I have managed to get django sending messages to a browser websocket client using channels. But I don't understand it very well.
Messages my Celery background task creates before the websocket handshake from the browser do not get shown.
messages are sent with
async_to_sync(channel_layer.group_send)(str(job.id),..)
Django v 2.1.7.
The channel layer uses redis so group_send is from channels_redis and the first argument is the group id. I would like a client connecting with the job.id to get all messages ever sent to that group.
Does this make sense?
django django-channels
asked Mar 25 at 11:30
Tim RichardsonTim Richardson
1,1754 gold badges17 silver badges38 bronze badges
add a comment |
I have managed to get django sending messages to a browser websocket client using channels. But I don't understand it very well.
Messages my Celery background task creates before the websocket handshake from the browser do not get shown.
messages are sent with
async_to_sync(channel_layer.group_send)(str(job.id),..)
Django v 2.1.7.
The channel layer uses redis so group_send is from channels_redis and the first argument is the group id. I would like a client connecting with the job.id to get all messages ever sent to that group.
Does this make sense?
django django-channels
asked Mar 25 at 11:30
Tim RichardsonTim Richardson
1,1754 gold badges17 silver badges38 bronze badges
add a comment |
I have managed to get django sending messages to a browser websocket client using channels. But I don't understand it very well.
Messages my Celery background task creates before the websocket handshake from the browser do not get shown.
messages are sent with
async_to_sync(channel_layer.group_send)(str(job.id),..)
Django v 2.1.7.
The channel layer uses redis so group_send is from channels_redis and the first argument is the group id. I would like a client connecting with the job.id to get all messages ever sent to that group.
Does this make sense?
django django-channels
asked Mar 25 at 11:30
Tim RichardsonTim Richardson
1,1754 gold badges17 silver badges38 bronze badges
I have managed to get django sending messages to a browser websocket client using channels. But I don't understand it very well.
Messages my Celery background task creates before the websocket handshake from the browser do not get shown.
messages are sent with
async_to_sync(channel_layer.group_send)(str(job.id),..)
Django v 2.1.7.
The channel layer uses redis so group_send is from channels_redis and the first argument is the group id. I would like a client connecting with the job.id to get all messages ever sent to that group.
Does this make sense?
django django-channels
django django-channels
asked Mar 25 at 11:30
Tim RichardsonTim Richardson
1,1754 gold badges17 silver badges38 bronze badges
asked Mar 25 at 11:30
Tim RichardsonTim Richardson
1,1754 gold badges17 silver badges38 bronze badges
asked Mar 25 at 11:30
Tim RichardsonTim Richardson
1,1754 gold badges17 silver badges38 bronze badges
asked Mar 25 at 11:30
Tim RichardsonTim Richardson
1,1754 gold badges17 silver badges38 bronze badges
asked Mar 25 at 11:30
Tim RichardsonTim Richardson
1,1754 gold badges17 silver badges38 bronze badges
1,1754 gold badges17 silver badges38 bronze badges
add a comment |
add a comment |
1 Answer
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The messages being sent are not waiting for unknown future clients/connections so you would have to implement that mechanism yourself. You should check if the client is connected before sending the message in which case you should store the message in some table and send it to the client later upon connection.
The main issue is how to track the online status of the client. I use an approach similar to the one in the answer to this question but it is not very reliable but isn't bad for a start
answered Mar 25 at 14:45
Ken4scholarsKen4scholars
1,8342 gold badges9 silver badges18 bronze badges
OK. I do already store the messages in a DB. I had a 'DIY' websocket server before, that sent all existing messages to new clients when they connected. I will try to work out how to replicate that with Channels.
– Tim Richardson
Mar 25 at 22:05
add a comment |
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1 Answer
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1 Answer
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active
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oldest
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active
oldest
votes
The messages being sent are not waiting for unknown future clients/connections so you would have to implement that mechanism yourself. You should check if the client is connected before sending the message in which case you should store the message in some table and send it to the client later upon connection.
The main issue is how to track the online status of the client. I use an approach similar to the one in the answer to this question but it is not very reliable but isn't bad for a start
answered Mar 25 at 14:45
Ken4scholarsKen4scholars
1,8342 gold badges9 silver badges18 bronze badges
OK. I do already store the messages in a DB. I had a 'DIY' websocket server before, that sent all existing messages to new clients when they connected. I will try to work out how to replicate that with Channels.
– Tim Richardson
Mar 25 at 22:05
add a comment |
The messages being sent are not waiting for unknown future clients/connections so you would have to implement that mechanism yourself. You should check if the client is connected before sending the message in which case you should store the message in some table and send it to the client later upon connection.
The main issue is how to track the online status of the client. I use an approach similar to the one in the answer to this question but it is not very reliable but isn't bad for a start
answered Mar 25 at 14:45
Ken4scholarsKen4scholars
1,8342 gold badges9 silver badges18 bronze badges
OK. I do already store the messages in a DB. I had a 'DIY' websocket server before, that sent all existing messages to new clients when they connected. I will try to work out how to replicate that with Channels.
– Tim Richardson
Mar 25 at 22:05
add a comment |
The messages being sent are not waiting for unknown future clients/connections so you would have to implement that mechanism yourself. You should check if the client is connected before sending the message in which case you should store the message in some table and send it to the client later upon connection.
The main issue is how to track the online status of the client. I use an approach similar to the one in the answer to this question but it is not very reliable but isn't bad for a start
answered Mar 25 at 14:45
Ken4scholarsKen4scholars
1,8342 gold badges9 silver badges18 bronze badges
The messages being sent are not waiting for unknown future clients/connections so you would have to implement that mechanism yourself. You should check if the client is connected before sending the message in which case you should store the message in some table and send it to the client later upon connection.
The main issue is how to track the online status of the client. I use an approach similar to the one in the answer to this question but it is not very reliable but isn't bad for a start
answered Mar 25 at 14:45
Ken4scholarsKen4scholars
1,8342 gold badges9 silver badges18 bronze badges
answered Mar 25 at 14:45
Ken4scholarsKen4scholars
1,8342 gold badges9 silver badges18 bronze badges
answered Mar 25 at 14:45
Ken4scholarsKen4scholars
1,8342 gold badges9 silver badges18 bronze badges
answered Mar 25 at 14:45
Ken4scholarsKen4scholars
1,8342 gold badges9 silver badges18 bronze badges
1,8342 gold badges9 silver badges18 bronze badges
OK. I do already store the messages in a DB. I had a 'DIY' websocket server before, that sent all existing messages to new clients when they connected. I will try to work out how to replicate that with Channels.
– Tim Richardson
Mar 25 at 22:05
add a comment |
OK. I do already store the messages in a DB. I had a 'DIY' websocket server before, that sent all existing messages to new clients when they connected. I will try to work out how to replicate that with Channels.
– Tim Richardson
Mar 25 at 22:05
OK. I do already store the messages in a DB. I had a 'DIY' websocket server before, that sent all existing messages to new clients when they connected. I will try to work out how to replicate that with Channels.
– Tim Richardson
Mar 25 at 22:05
OK. I do already store the messages in a DB. I had a 'DIY' websocket server before, that sent all existing messages to new clients when they connected. I will try to work out how to replicate that with Channels.
– Tim Richardson
Mar 25 at 22:05
add a comment |
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