Crate function_timer

source ·
Expand description

This crate allow to put a time attribut macro on any function. It will time the execution of the function and emit a histogram metric using metrics crate.

Example

use std::error::Error;
use metrics_exporter_prometheus::PrometheusBuilder;
use function_timer::time;

struct Test {}

impl Test {
    #[time("my_metric")]
    pub fn impl_function(&self) {
        println!("This another test");
    }

    #[time("another_metric")]
    pub fn impl_fail_function(&self, text:&str) -> Result<(), Box<dyn Error>>{
        let number:usize = text.parse()?;
        println!("{number}");

        Ok(())
    }

    #[time("my_metric")]
    pub fn static_function() {
        println!("This another test");
    }
}

#[time("my_metric")]
pub fn free_function() {
    println!("This a test");
}

fn main() -> Result<(), Box<dyn Error>> {
    let builder = PrometheusBuilder::new();
    let handle = builder.install_recorder()?;

    free_function();

    Test::static_function();

    let t = Test {};
    t.impl_function();

    let result = t.impl_fail_function("azerty");
    assert!(result.is_err());
    let result = t.impl_fail_function("1");
    assert!(result.is_ok());


    println!("{}", handle.render());

    Ok(())
}

Note

If time is put on functions that have the same names, the only way to distinguish between them is to not use the same metric name. Plan is to allow custom tag on annotation and/or allow to put time on an impl block.

Structs

Attribute Macros

  • time
    Macro that time a function and emit a histogram metric using metrics crate