August 2025
Intermediate to advanced
272 pages
6h 14m
English
Content preview from Network Programming in Elixir and Erlang
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Writing Code for the Chat Protocol
It’s almost always a good idea to keep the protocol code separate from the networking code when possible. Protocol code is often stateless and free of side effects, which makes it a good candidate for isolation and easy unit testing. We’ll do this by keeping the protocol code inside a separate module, Chat.Protocol. Our protocol code will provide two functions:
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decode_message/1 will take a binary and decode it into a message struct according to our chat protocol
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encode_message/1 will take a message struct and encode it into a binary
Let’s set up a project before diving in. Hop into a shell and run the following command:
| | > mix new chat --sup |
| | * creating README.md |
| | * creating .formatter.exs ... |
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