Enum Error 

pub enum Error {
    NotFound(String),
    PreconditionFailed(String),
    Io(String),
    Auth(String),
    Backend(String),
}

Errors a backend may raise.

Variants are deliberately coarse — a backend reports the failure mode it can plausibly recover or message about, not every wire-level detail.

Variants

NotFound(String)

The key does not exist (read-side miss). put never raises this.

PreconditionFailed(String)

A conditional write’s precondition was not met (S3/R2 412). The compare-and-swap lost the race: the object changed (or appeared, or vanished) since the comparand was read. Re-read and retry. Only ObjectStore::put_if raises this.

Io(String)

Network / IO / protocol error from a remote backend.

Auth(String)

Authentication / authorization failure (e.g. SigV4 rejected).

Backend(String)

Backend-specific error the caller doesn’t need to discriminate.

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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.