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Nothing happens. In particular the message does not appear in the chat log. Similarly, when Channels accepts a WebSocket connection, it consults the root routing configuration to lookup a consumer, and then calls various functions on the consumer to handle events from the connection.
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For now it does not broadcast messages to other clients in the same room. Note Channels also supports writing asynchronous consumers for greater performance. However any asynchronous consumer must be careful hyml avoid directly performing blocking Hookers union Chester, such as accessing a Django model.
See the Consumers reference for more information about writing asynchronous consumers. We need to create a routing configuration for the chat app that has a route to the consumer. The next step is to point the root routing configuration at the chat. This stays the same.
Administering a chat room
This root char configuration specifies that when a connection is made to the Channels development server, the ProtocolTypeRouter will first inspect the type of connection. Scopes will be discussed later in this tutorial. Then the connection will be given to the URLRouter. OK Applying auth. OK Applying admin. OK Applying contenttypes. OK Applying sessions.
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For that to work, we need to have multiple instances of the same ChatConsumer be able to talk to each other. Channels provides a channel layer abstraction that enables this kind of communication between consumers.
Go to the terminal where you ran the runserver command and press Control-C to stop the server. It allows multiple consumer instances to talk with each other, and with other parts of Django.
A channel layer provides the following abstractions: A channel is a mailbox where messages can be sent to. Each channel has a name.
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Anyone who has the name of a channel can send a message to the channel. A group is a group of related channels.
A group has a name. It is not possible to enumerate what channels are in a particular group. Every consumer instance has an automatically generated unique channel name, and so can be communicated with via a channel layer.
In our Suck you off host application we want to have multiple instances of ChatConsumer in the same room communicate with each other. To do that we will have each Chaf add its channel to a group whose name is based on the room name. That will allow ChatConsumers to transmit messages to all other ChatConsumers in the same room.
We will use a channel layer that uses Redis as its backing store.
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However most projects will just use a single 'default' channel layer. The ChatConsumer will receive that message and forward it to the group corresponding to the room name. Several parts of the new ChatConsumer code deserve further explanation: self.
Every consumer has a scope that contains information about its connection, including in particular any positional or keyword arguments from the URL route and the currently authenticated user if any. Group names may only contain letters, digits, hyphens, and periods. Therefore this example code will fail on room names that have other characters.
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s a group. All channel layer cha are asynchronous. If you do not call accept within the connect method then the connection will be rejected and closed. You might want to reject a connection for example because the requesting user is not authorized to perform the requested action.
The chat room app is broken into three sections
It is recommended that accept be called as the last action in connect cht you choose to accept the connection. An event has a special 'type' key corresponding to the name of the method that should be invoked on consumers that receive the event.
Open a second browser tab to the same room. You now have a basic fully-functional chat server!