Enum StoreError 

pub enum StoreError<K, V> {
    DuplicatedKey {
        key: K,
        value_previous: V,
        value_updated: V,
    },
    KeyOutOfSync {
        key: K,
        value_previous: V,
        value_updated: V,
    },
    Backend {
        key: K,
        error: String,
    },
}

Error related to a Store.

Variants

DuplicatedKey

This process already stored a different value under that key: the same function was computed twice with disagreeing results.

Fields

key: K

value_previous: V

value_updated: V

KeyOutOfSync

The durable entry was written by someone else — another process sharing the cache root, or a bundle import — before this insert reached it. Benign: the two values are equally valid and the stored one stays.

Fields

key: K

value_previous: V

value_updated: V

Backend

The storage backend refused the write, so the entry is not durable and will be recomputed on the next run.

Fields

key: K

error: String

Implementations

impl<K, V> StoreError<K, V>

pub fn reason(&self) -> &str

Why the write failed, without the key or the value.

Display renders both, which is right for small entries and wrong for a compiled kernel: those values are megabytes of binary, and a log line must not carry one. Callers storing large values report this instead.

Trait Implementations

impl<K: Debug, V: Debug> Debug for StoreError<K, V>

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

Formats the value using the given formatter.

impl<K: Debug, V: Debug> Display for StoreError<K, V>

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

Formats the value using the given formatter.

impl<K: Debug, V: Debug> Error for StoreError<K, V>

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.