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//! [`FsMistrustErrorExt`]
use extend::ext;
use paste::paste;
use tor_error::ErrorKind;
use ErrorKind as EK;
/// Helper; `access_failed` should be `FooAccessFaile` for the appropriate `Foo`
fn mistrust_error_kind(e: &fs_mistrust::Error, access_failed: ErrorKind) -> ErrorKind {
if e.is_bad_permission() {
EK::FsPermissions
} else {
access_failed
}
}
/// Generate the extension trait and its impl
///
/// Input is the set of "kinds of thing", each of which corresponds to an `ErrorKind`.
///
/// # Input syntax
///
/// ```text
/// thing, "DESCRIPTION"; // Provide thing_error_kind(), using ThingAccessFailed
/// [Prefix] THING, "DESCRIPTION"; // uses PrefixThingAccessFAiled
/// ```
macro_rules! accesses { {
$( $([ $prefix:ident ])? $kind:ident, $description:tt; )*
} => { paste!{
/// Extension trait for getting a [`tor_error::ErrorKind`] from a [`fs_mistrust::Error`]
#[ext(name = FsMistrustErrorExt, supertraits = Sealed)]
pub impl fs_mistrust::Error {
$(
#[doc = concat!("The error kind if we were trying to access", $description)]
fn [<$kind _error_kind>](&self) -> tor_error::ErrorKind {
mistrust_error_kind(self, EK::[<$($prefix)? $kind:camel AccessFailed>])
}
)*
}
} } }
/// Sealed
pub trait Sealed {}
impl Sealed for fs_mistrust::Error {}
accesses! {
cache, "a cache directory";
[Persistent] state, "a persistent state directory";
keystore, "a keystore";
}
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