Enum BackendError 

#[non_exhaustive]
pub enum BackendError {
    InvalidRequest(String),
    Serialization {
        source: Error,
    },
    Provider {
        family: &'static str,
        source: BoxError,
    },
}

Operating an already-constructed backend failed: a runtime execution failure.

Returned by chat completion, streaming, prepare/send/parse, rendering, model catalog, and balance calls — everything that drives a live backend. Construction failures are BackendConstructError; static capability gating is CapabilityError.

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.

InvalidRequest(String)

The request was invalid before it reached the provider.

Serialization

Failed to serialize a request payload or render provider-specific types.

Fields

source: Error

Underlying serde_json serialization failure.

Provider

The underlying provider SDK returned an error.

Carries the backend family for attribution and the provider error as a boxed source (see BoxError for why this is not a concrete ProviderError).

Fields

family: &'static str

Backend family.

source: BoxError

Provider-specific source error.

Implementations

impl BackendError

pub fn invalid_request(message: impl Into<String>) -> Self

Creates an invalid-request error with a stable, user-facing message.

pub fn serialization(source: Error) -> Self

Creates a serialization error wrapping a serde_json failure.

pub fn provider<E>(family: &'static str, source: E) -> Self

where E: StdError + Send + Sync + 'static,

Wraps a provider-specific source error for the given backend family.

Trait Implementations

impl Debug for BackendError

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

Formats the value using the given formatter.

impl Display for BackendError

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

Formats the value using the given formatter.

impl Error for BackendError

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.