MRML

Introduction

This project is a reimplementation of the nice MJML markup language in Rust.

How to use it

use mrml;

fn main() {
    match mrml::to_html("<mjml><mj-body></mj-body></mjml>", mrml::Options::default()) {
        Ok(content) => println!("{}", content),
        Err(_) => println!("couldn't convert mjml template"),
    };
}

Why?

• A Node server rendering a mjml template takes around 20Mo of RAM at startup and 130Mo under stress test. In Rust, less than 1.7Mo at startup and a bit less that 3Mo under stress test. The Rust version can also handle 2 times more requests per seconds. You can run the bench by doing bash script/run-bench.sh.
• The JS implementation cannot be run in the browser. In Rust (and Wasm), you can.

Performance

With the same linux amd64 machine, to render the amario template

• Node: 62.803ms
• Rust: 13.180ms

To reproduce those results:

• Node, in example/mjml-bench run npm start -- ../../test/template-amario.mjml
• Rust, run cargo bench amario

With a web server, as of today, on a mac book pro from 2017. (Old result)

	Rust	Node
Requests per seconds	520.50	272.61
CPU usage at boot time	0.20%	1.74%
CPU usage under bench	49.81%	136.83%
RAM usage at boot time	1.12MB	17.27MB
RAM usage under bench	2.85MB	128.32MB
Docker image size	77.3MB	178MB