Enum WriteError 

pub enum WriteError {
    Transient(Transient),
    Permanent(Permanent),
    OutcomeUnknown(Failure),
}

Why writing events failed.

Variants

Transient(Transient)

The write certainly stored nothing, and trying it again later may succeed. A precondition that did not hold is a Transient::Conflict.

Permanent(Permanent)

The write certainly stored nothing, and trying it again will not help, for example since it declares its preconditions wrongly, or since an event does not match its schema.

OutcomeUnknown(Failure)

The write failed in a way that leaves open whether the database stored the events, so trying it again unchanged may store them twice. Find out first, for example by reading the subject, or try again only with a precondition that refuses the same events a second time, such as Precondition::on_event_id. It belongs to no category.

Trait Implementations

impl Categorized for WriteError

fn category(&self) -> Option<Category>

Returns the category of the error, or None if it belongs to none.

impl Debug for WriteError

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

Formats the value using the given formatter.

impl Display for WriteError

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

Formats the value using the given formatter.

impl Error for WriteError

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<Permanent> for WriteError

fn from(failure: Permanent) -> Self

Converts to this type from the input type.

impl From<PreconditionsError> for WriteError

fn from(refusal: PreconditionsError) -> Self

Converts to this type from the input type.

impl From<WriteError> for HttpError

fn from(error: WriteError) -> Self

Converts to this type from the input type.

impl<D> From<WriteError> for Error<D>

fn from(failure: WriteError) -> Self

Converts to this type from the input type.

impl<D> From<WriteError> for ExecuteError<D>

fn from(failure: WriteError) -> Self

Converts to this type from the input type.