The API provided hides the implementation details of the Fn platform contract and allows a user to focus on the code and easily implement function-as-a-service programs.

The Fn platform offers a command line tool to initialize, build and deploy function projects. Follow the fn tool quickstart to learn the basics of the Fn platform.

Boilerplate code can be generated using the following command: fn init --init-image=fnproject/rust:init

The initializer will actually use cargo and generate a cargo binary project for the function. It is then possible to specify a dependency as usual.

[dependencies]
fdk = ">=0.2.0"

This is a simple function which greets the name provided as input. This code was generated using the above mentioned boilerplate code command.

use fdk::{Function, FunctionError, RuntimeContext};
use tokio; // Tokio for handling future.

#[tokio::main]
async fn main() -> Result<(), FunctionError> {
    if let Err(e) = Function::run(|_: &mut RuntimeContext, i: String| {
        Ok(format!(
            "Hello {}!",
            if i.is_empty() {
                "world"
            } else {
                i.trim_end_matches("\n")
            }
        ))
    })
    .await
    {
        eprintln!("{}", e);
    }
    Ok(())
}