2_include_pubsub.md

Wiring up the node

Now that we're shifting our implementation of the chat from a custom libp2p protocol to a pubsub model, we have a couple of to-dos.

First, we need to update our node configuration. Libp2p has a specific configuration in the options object for pubsub where we need to specify that our node support pubsub and then what implementation of pubsub it uses. We're going to use gossipsub as that's the current preferred implementation for libp2p. This is a separate library from so the main js-libp2p so we will need to install this dependency as well.

Second, we need to remove the protocol handler defined libp2p.handle for our node and replace it with the pubsub class implemented in section 6.1. We also have to bind our standard input event listener to the send function defined in our pubsub class instead of the chat protocol.

Try it yourself

• require your pubsub class in your node
• Install the libp2p-gossipsub dependency and require it in your node
• Add a pubsub section to your node's options configuration object and set it to gossipsub
• Replace the libp2p.handle function with the instantiation of a pubsub object and pass your libp2p node and a topic to it
• Redirect standard input to the send function from your pubsub class
• Run the boostrap node and a second node.
• Try typing something in the terminal where the second node is running and then verify that you see that text appear on the bootstrap node's terminal

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