Enum SessionError 

#[non_exhaustive]
pub enum SessionError {
    EmptyToken,
    EmptySubject,
    EmptyFingerprint,
    UnknownSession,
    TokenInUse,
    Store(StoreError),
}

调用方误用，或后端故障向上传递。

错误分界：只有需要校验调用方输入或做安全判定的方法才返回本类型 （bind / rotate）；纯委派给 store 的方法（revoke / revoke_all / purge_expired）没有可误用的输入也不产生判定，直接透出 StoreError。

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

EmptyToken

EmptySubject

EmptyFingerprint

UnknownSession

rotate 的旧 token 不存在、已吊销或已过期，或指纹与本请求不符。

TokenInUse

rotate 的目标 token 已是一个在用会话（未吊销且未过期）， 包括 new == old —— 换到同一个 token 语义上自相矛盾，见 rotate。

Store(StoreError)

Trait Implementations

impl Clone for SessionError

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SessionError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for SessionError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for SessionError

impl Error for SessionError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<StoreError> for SessionError

fn from(e: StoreError) -> Self

Converts to this type from the input type.

impl PartialEq for SessionError

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for SessionError