Rust lab work - chat service

Setup

• install Rust
• make sure everything works by running cargo test

Part 1, network protocol

In the chatproto/src/netproto directory, edit decode.rs and encode.rs. The network protocol work in the following way:

• structs are encoded by encoding each field, in the order they appear in the definition
• enums are encoded by first inserting a byte designing the variant we are in (starting at 0), and then encoding the enum fields
• numbers are encoded in the following way:
  • with u < 251, encode it as a single byte with that value,
  • with 251 <= u < 2**16, encode it as 251 followed by a little-endian u16 value,
  • with 2**16 <= u < 2**32, encode it as 252 followed by a little-endian u32 value,
  • with 2**32 <= u < 2**64, encode it as 253 followed by a little-endian u64 value,
  • with 2**64 <= u < 2**128, encode it as 254 followed by a little-endian u128 value.
• collections are encoded by first putting their sizes, and they the contents

You can test your implementation by running:

cargo test netproto

It is suggested to implement the encoding/decoding pair of functions in the order they are presented.

Part 2, simple server logic

Before starting, do the following:

• rename the sample.rs file using a name unique to your group;
• in the renamed file, edit the GROUP_NAME constant and put your names in it.

You will only have to edit the renamed file, do not edit any other file! You will be graded on that file, and you should only send this file to the course teacher.

You will have to find fill the Server structure with data structures that will allow you to write the traits methods. You will most likely want to use RwLock (the one from async_std::sync::RwLock).

Part 3, federation

Run tests and executables with the -F federation flag.

Running the client and server

Server

$ RUST_LOG=debug cargo run --bin server
...

Client

$ RUST_LOG=debug cargo run --bin client -- --name my_name
...