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//! Utility functions for the rest of the crate.
use tor_persist::StateMgr;
use tracing::error;
/// A RAII guard that calls `<T as StateMgr>::unlock` on drop.
pub(crate) struct StateMgrUnlockGuard<'a, T: StateMgr + 'a> {
/// The inner manager.
mgr: &'a T,
}
impl<'a, T: StateMgr + 'a> Drop for StateMgrUnlockGuard<'a, T> {
fn drop(&mut self) {
if let Err(e) = self.mgr.unlock() {
error!("Failed to unlock state manager: {}", e);
}
}
}
impl<'a, T: StateMgr + 'a> StateMgrUnlockGuard<'a, T> {
/// Create an unlock guard.
pub(crate) fn new(mgr: &'a T) -> Self {
Self { mgr }
}
/// Consume the unlock guard without unlocking the state manager.
pub(crate) fn disarm(self) {
std::mem::forget(self);
}
}
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