mls_rs_core/
error.rs

1// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
2// Copyright by contributors to this project.
3// SPDX-License-Identifier: (Apache-2.0 OR MIT)
4
5use core::fmt::{self, Display};
6
7#[cfg(feature = "std")]
8#[derive(Debug)]
9/// Generic error used to wrap errors produced by providers.
10pub struct AnyError(Box<dyn std::error::Error + Send + Sync>);
11
12#[cfg(not(feature = "std"))]
13#[derive(Debug)]
14pub struct AnyError;
15
16#[cfg(feature = "std")]
17impl Display for AnyError {
18    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
19        self.0.fmt(f)
20    }
21}
22
23#[cfg(feature = "std")]
24impl std::error::Error for AnyError {
25    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
26        self.0.source()
27    }
28}
29
30#[cfg(feature = "std")]
31impl AnyError {
32    pub fn inner_dyn_error(&self) -> &(dyn std::error::Error + Send + Sync + 'static) {
33        &*self.0
34    }
35}
36
37#[cfg(not(feature = "std"))]
38impl Display for AnyError {
39    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
40        core::fmt::Debug::fmt(self, f)
41    }
42}
43
44/// Trait to convert a provider specific error into [`AnyError`]
45pub trait IntoAnyError: core::fmt::Debug + Sized {
46    #[cfg(feature = "std")]
47    fn into_any_error(self) -> AnyError {
48        self.into_dyn_error()
49            .map_or_else(|this| AnyError(format!("{this:?}").into()), AnyError)
50    }
51
52    #[cfg(not(feature = "std"))]
53    fn into_any_error(self) -> AnyError {
54        AnyError
55    }
56
57    #[cfg(feature = "std")]
58    fn into_dyn_error(self) -> Result<Box<dyn std::error::Error + Send + Sync>, Self> {
59        Err(self)
60    }
61}
62
63impl IntoAnyError for mls_rs_codec::Error {
64    #[cfg(feature = "std")]
65    fn into_dyn_error(self) -> Result<Box<dyn std::error::Error + Send + Sync>, Self> {
66        Ok(self.into())
67    }
68}
69
70impl IntoAnyError for core::convert::Infallible {}
71
72#[cfg(test)]
73mod tests {
74    use super::{AnyError, IntoAnyError};
75    use mls_rs_codec::Error as CodecError;
76
77    #[test]
78    fn inner_dyn_error_returns_wrapped_error_with_data() {
79        let error_with_data = CodecError::Custom(42);
80        let any_error: AnyError = error_with_data.into_any_error();
81
82        let downcast_err = any_error
83            .inner_dyn_error()
84            .downcast_ref::<CodecError>()
85            .expect("Expected the dyn error to be of type CodecError");
86
87        assert!(matches!(downcast_err, CodecError::Custom(42)));
88    }
89}
mls_rs_core/error.rs

mls_rs_core/
error.rs
