Trace_Err

A small extension to the tracing crate, which provides a single method for core::result::Result<T, E> and core::option::Option<T>.

Adds trace_expect to Result, which invoke the tracing::error! macro (in case of Result::Err) in addition to unwrapping/expecting the Result.

Adds trace_expect to Option, which invoke the tracing::error! macro (in case of Option::None) in addition to unwrapping/expecting the Option.

Shamelessly derived from the Log_Err crate.

Shorthand for:

use tracing::error;

fn something() -> Result<(), &'static str> {Err("there was some problem")}

let msg = "Some message";
something().map_err(|e| tracing::error!("{}: {:?}", msg, e)).expect(msg)

Example:

use std::fs::File;
use trace_err::*;

let mut file = File::open("foo.txt").trace_expect("Error creating file");

# Error will be traced with the error! macro
2024-06-12T09:31:23.933299Z ERROR expect: trace-err/lib.rs:87:39: Error creating file: Os { code: 2, kind: NotFound, message: "No such file or directory" }

# Main program panic'ing with same message
thread 'main' panicked at trace-err/lib.rs:87:39:
Error creating file: Os { code: 2, kind: NotFound, message: "No such file or directory" }