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Refactor From<io::Error> for BinstallError

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Avoid one `expect`.

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>
This commit is contained in:
Jiahao XU 2022-06-21 14:10:27 +10:00
parent c5a2a89361
commit 2f38925ee4
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GPG key ID: 591C0B03040416D6
1 changed files with 7 additions and 8 deletions
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15
src/errors.rs
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@ -234,18 +234,17 @@ impl Termination for BinstallError {
impl From<std::io::Error> for BinstallError {
fn from(err: std::io::Error) -> Self {
let is_inner_binstall_err = err
.get_ref()
.map(|e| e.is::<BinstallError>())
.unwrap_or_default();
if err.get_ref().is_some() {
let kind = err.kind();
if is_inner_binstall_err {
let inner = err
.into_inner()
.expect("err.get_ref() returns Some, so err.into_inner() should als return Some");
*inner
.expect("err.get_ref() returns Some, so err.into_inner() should also return Some");
inner
.downcast()
.expect("The inner err is tested to be BinstallError")
.map(|b| *b)
.unwrap_or_else(|err| BinstallError::Io(std::io::Error::new(kind, err)))
} else {
BinstallError::Io(err)
}