1 stable release
1.0.0 | May 30, 2024 |
---|
#45 in #tauri
139 downloads per month
9KB
100 lines
Introduction
A crate that makes it easy to use the anyhow crate with the tauri framework as a command result.
How to use
Define a function that uses anyhow
:
fn function_that_throws() -> anyhow::Result<()> {
anyhow::bail!("Simulating a possible throw")
}
fn function_that_succeeds() -> anyhow::Result<String> {
Ok("this function succeeds".to_string())
}
Then proceed to use the anyhow_tauri::TAResult<T>
as a return type of your command. And that's it! Now, you can handle your errors as you would outside tauri!
#[tauri::command]
fn test() -> anyhow_tauri::TAResult<String> {
Ok("No error thrown.".into())
}
#[tauri::command]
fn test_anyhow_success() -> anyhow_tauri::TAResult<String> {
function_that_succeeds().into_ta_result()
// could also be written as
// Ok(function_that_succeeds()?)
}
#[tauri::command]
fn test_throw() -> anyhow_tauri::TAResult<String> {
function_that_throws()?;
Ok("this should never trigger".to_owned())
}
#[tauri::command]
fn test_pure_err_conversion() -> anyhow_tauri::TAResult<String> {
let _some_empty_err = anyhow::anyhow!("some err").into_ta_empty_result();
anyhow::anyhow!("Showcase of the .into_ta_result()").into_ta_result()
}
#[tauri::command]
fn test_bail() -> anyhow_tauri::TAResult<String> {
anyhow_tauri::bail!("Showcase of the .bail!()")
}
#[tauri::command]
fn test_ensure() -> anyhow_tauri::TAResult<String> {
anyhow_tauri::ensure!(1 == 2); // this should throw
Ok("this should never trigger".to_owned())
}
Notice that you can casually use the ?
operator. I've had to create a wrapper for the bail!()
and ensure!()
macros, since I was unable to implement proper traits for them (somebody can submit a PR tho). The TA
before each type means TauriAnyhow
because I don't want to use type names that could collide with other type names in your codebase. The whole crate is around +-100 lines of code. If you don't want to depend on another package, you should be able to copy-paste it to your codebase without any problems (I don't expect this crate to change that much).
Caveats
- By default, sending errors to the client is disabled in production builds. To enable them, turn on the feature
show_errs_in_release
. - You have to use the
anyhow_tauri::TAResult<T>
as a return type of your commands. Could be a problem for some people. - Might lack support for some
anyhow
features, I didn't find any while dogfooding tho!
Credit
Initially, when I asked about using anyhow
with tauri in a Tauri Working Group Office Hours call, a Discord user (I cannot find them for the love of god 😅) suggested I use the following code:
#[derive(Debug)]
pub struct CommandError(pub anyhow::Error);
impl std::error::Error for CommandError {}
impl Serialize for CommandError {
fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
serializer.serialize_str(&format!("{:#}", self.0))
}
}
impl From<anyhow::Error> for CommandError {
fn from(error: anyhow::Error) -> Self {
Self(error)
}
}
pub type Result<T> = std::result::Result<T, CommandError>;
I've taken this code, further extended it, and added some additional features so that it's "smoother" for anyhow
to work with tauri
. Soooo... credit to that mysterious Discord user :/
Dependencies
~0.4–1MB
~23K SLoC