Rust is a modern programming language that is designed to be fast, safe, and reliable. It is a popular choice for developing high-performance systems and applications, including web applications.

Rust's steep learning curve can be intimidating, and building web applications from scratch can be a time-consuming process.

That's where web frameworks like Poem come in. Poem is a fast and reliable web framework designed specifically for Rust. It provides a simple and intuitive interface for building web applications, taking advantage of Rust's performance and safety features.

In this article, we'll introduce you to the Poem web framework and show you how to get started building fast and reliable web applications in Rust.

What is Poem?

Poem is a web framework for Rust that is designed to be fast, reliable, and easy to use. It is built on top of the hyper library, which is a high-performance HTTP library for Rust. Poem provides a set of abstractions and utilities that make it easy to build web applications in Rust.

Why use Poem for web development in Rust?

Fast and efficient

Poem is designed to be fast and efficient, taking advantage of Rust's performance optimizations. It provides an asynchronous runtime based on Tokio, which enables high concurrency and low overhead.

Safe and reliable

Rust's memory safety features make it an ideal choice for building secure and reliable web applications. Poem takes advantage of these features to provide a safe and reliable framework that helps developers avoid common security pitfalls.

Easy to use

Poem provides a simple and intuitive interface for building web applications. Its routing and handler system makes it easy to define RESTful APIs and web endpoints.

Flexible and extensible

Poem is a flexible and extensible web framework that can be customized to fit a variety of use cases. It provides a middleware system for handling cross-cutting concerns, such as authentication and logging.

Getting started with poem is super simple, here is a small example to get you started with building a server using poem

Getting Started with Poem

To get started with Poem, you'll need to have Rust installed on your machine. Once you have Rust installed, you can create a new Rust project and add Poem as a dependency.

$ cargo new my_project
$ cd my_project
$ echo 'poem = "0.11"' >> Cargo.toml 
// alternatively use can simply run `cargo add poem` in the command line or even simpler is to just add `poem = "1.3.55"` in the cargo.toml file as a dependency.
$ cargo update

Once you have added Poem as a dependency, you can start building your web application. Poem uses a routing system to map incoming requests to handlers that can handle those requests. Here's a simple example of how to define a route and handler in Poem:

use poem::{handler, route};

#[route(GET, "/")]
async fn hello() -> &'static str {
    "Hello, world!"
}

#[tokio::main]
async fn main() {
    let mut app = route().at("/", get(hello));
    app.run("127.0.0.1:8000").await.unwrap();
}

In this example, we define a route using the route macro and map it to a handler that returns a static string. We then create an instance of the App struct and add our route to it using the at method. Finally, we start the application by calling the run method.

Wondering what is [tokio::main]?

In the example, the [tokio::main] attribute is used to indicate that the main function should be executed using the Tokio runtime. Tokio is an asynchronous runtime for Rust that provides an event-driven, non-blocking I/O model.

The [tokio::main] attribute is used to automatically generate the boilerplate code required to run an asynchronous Tokio-based Rust program. It creates a new Tokio runtime and then executes the main function within that runtime. This allows you to write asynchronous Rust code that takes advantage of Tokio's performance optimizations without having to manually manage the runtime yourself.

In simple words, the [tokio::main] attribute is a shorthand way to define the main function that runs within the Tokio runtime, allowing you to write high-performance asynchronous Rust code with ease.

That's it for now folks, thanks for reading.

In future blogs, we will be discussing some other complex uses cases of poem