Echo Writes Code

errors.rs

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use axum::http::{ StatusCode };
use axum::response::{ IntoResponse, Response };

use std::fmt;
use std::io;
use std::num;
use std::path::{ PathBuf };

pub type Result<T> = std::result::Result<T, Error>;

pub(crate) enum Error {
	AmbiguousPageTitle(PathBuf),
	FromConfigCrate(config::ConfigError),
	FromRegexCrate(regex::Error),
	FromStdIo(io::Error),
	FromTeraCrate(tera::Error),
	InvalidPort(num::TryFromIntError),
	MissingPageTitle(PathBuf),
	PageNotFound(String),
}

impl fmt::Display for Error {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		use Error::*;

		match *self {
			AmbiguousPageTitle(ref pathbuf) => write!(f, "Page title is ambiguous (there must be exactly one `#` heading): {}", pathbuf.display()),
			FromConfigCrate(ref e) => write!(f, "Error from the config crate: {}", e),
			FromRegexCrate(ref e) => write!(f, "Error from the regex crate: {}", e),
			FromStdIo(ref e) => write!(f, "IO error: {}", e),
			FromTeraCrate(ref e) => write!(f, "Error from the tera crate: {}", e),
			InvalidPort(ref e) => write!(f, "Invalid network.port: {}", e),
			MissingPageTitle(ref pathbuf) => write!(f, "Page does not have a title: {}", pathbuf.display()),
			PageNotFound(ref path) => write!(f, "Page not found: {}", path),
		}
	}
}

impl From<config::ConfigError> for Error {
	fn from(e: config::ConfigError) -> Error {
		Error::FromConfigCrate(e)
	}
}

impl From<regex::Error> for Error {
	fn from(e: regex::Error) -> Error {
		Error::FromRegexCrate(e)
	}
}

impl From<io::Error> for Error {
	fn from(e: io::Error) -> Error {
		Error::FromStdIo(e)
	}
}

impl From<tera::Error> for Error {
	fn from(e: tera::Error) -> Error {
		Error::FromTeraCrate(e)
	}
}

impl IntoResponse for Error {
	fn into_response(self) -> Response {
		use Error::*;

		tracing::error!("{}", self);

		let (http_status_code, message) = match self {
			PageNotFound(..) => (StatusCode::NOT_FOUND, "Page not found"),
			_ => (StatusCode::INTERNAL_SERVER_ERROR, "The server encountered an unexpected error"),
		};

		(http_status_code, message).into_response()
	}
}