Enum Error 

#[non_exhaustive]
pub enum Error {
    CapacityExceeded {
        what: &'static str,
    },
    TooLarge {
        what: &'static str,
        len: usize,
        max: usize,
    },
    DimMismatch {
        got: usize,
        want: usize,
    },
    NotFound(FactId),
    AlreadyClosed(FactId),
    ConfigMismatch(&'static str),
    Corrupt(&'static str),
    UnsupportedVersion(u16),
    Invalid(&'static str),
    Storage(String),
    Arena(Error),
}

Every way an engine call can fail.

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.

CapacityExceeded

A pool or table would grow past its configured ceiling.

Fields

what: &'static str

Which limit was hit (e.g. "facts", "tags per fact").

TooLarge

A single input value is larger than its configured maximum.

Fields

what: &'static str

Which input was oversized (e.g. "text").

len: usize

Actual length in bytes (or elements, per what).

max: usize

The configured ceiling.

DimMismatch

An input vector’s dimension does not match Config::dim.

Fields

got: usize

Dimension of the provided vector.

want: usize

Dimension the database was configured with.

NotFound(FactId)

The referenced fact does not exist (or was purged).

AlreadyClosed(FactId)

revise targeted a fact whose validity interval is already closed.

ConfigMismatch(&'static str)

The supplied Config is invalid, or incompatible with the config stored in an existing database (changing dim or shard counts requires a reindex, not an open).

Corrupt(&'static str)

A snapshot or journal failed validation.

UnsupportedVersion(u16)

The snapshot was written by an unknown format version.

Invalid(&'static str)

An input violates a structural rule that is not a size limit (a link without a subject entity, an empty tag, a name with no indexable characters).

Storage(String)

The Storage implementation failed; carries the implementation error’s debug rendering (the engine stays generic and cloneable, the wrapper logs the original).

Arena(Error)

An underlying storage-structure error (bubbled up from the arena layer with its context intact).

Trait Implementations

impl Clone for Error

fn clone(&self) -> Error

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Eq for Error

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.

impl From<Error> for Error

fn from(source: Error) -> Error

Converts to this type from the input type.

impl From<Error> for HostError

fn from(source: Error) -> Self

Converts to this type from the input type.

impl PartialEq for Error

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Error