typed-session 0.9.0

Async typed session middleware
Documentation 
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use std::fmt::Debug;

/// All errors that can occur in this crate.
#[derive(Debug, thiserror::Error)]
#[allow(missing_copy_implementations)]
pub enum Error<SessionStoreConnectorError> {
    /// A session was attempted to be updated, but the session does not exist.
    /// This may happen due to concurrent modification, and is forbidden to prevent data inconsistencies.
    /// If you receive this error, revert everything that you did while handling the request that
    /// used this session.
    #[error("the session that was attempted to be updated does not exist, which indicates that it was concurrently modified or deleted")]
    UpdatedSessionDoesNotExist,

    /// Tried as often as desired to generate a session id, but all generated ids already exist.
    #[error("the maximum number of retries to generate a session id was reached")]
    MaximumSessionIdGenerationTriesReached {
        /// The maximum number of retries that was reached.
        maximum: u32,
    },

    /// The given cookie has a wrong length.
    #[error("the given cookie has length {actual}, but is expected to have length {expected}")]
    WrongCookieLength {
        /// The expected cookie length.
        expected: usize,
        /// The actual cookie length.
        actual: usize,
    },

    /// An error occurred in the session store connector.
    #[error("{0}")]
    SessionStoreConnector(SessionStoreConnectorError),
}

impl<SessionStoreConnectorError> From<SessionStoreConnectorError>
    for Error<SessionStoreConnectorError>
{
    fn from(error: SessionStoreConnectorError) -> Self {
        Self::SessionStoreConnector(error)
    }
}

/*impl<SessionStoreConnectorError: Display> Display for Error<SessionStoreConnectorError> {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match self {
            Error::UpdatedSessionDoesNotExist => write!(f, "the updated session does not exist, which indicates that it was concurrently modified or deleted."),
            Error::MaximumSessionIdGenerationTriesReached => write!(f, "tried to generate a new session id but generated only existing ids until the maximum retry limit was reached."),
            Error::WrongCookieLength { expected, actual } => write!(f, "wrong cookie length, expected {expected}, but got {actual}"),
            Error::SessionStoreConnector(error) => write!(f, "{error}"),
        }
    }
}*/

mod expect_impl_error {
    trait ExpectImplError: std::error::Error {}

    impl<SessionStoreConnectorError: std::error::Error> ExpectImplError
        for super::Error<SessionStoreConnectorError>
    {
    }
}