Enum PoolError 

#[non_exhaustive]
pub enum PoolError {
    Build(BuildError),
    UnsupportedBackend(String),
}

Error type for pool creation failures.

Returned by create_pool (and the other topology builders) when a pool cannot be constructed. Historically this was a bare alias for deadpool’s BuildError; it now also carries the boot-time refusal emitted for a recognized-but-not-yet-wired backend (SQLite, issue #1614), so callers fail fast at pool construction with an actionable message instead of at the first query. The Build variant delegates its Display to the underlying BuildError, so the Postgres path’s error text is unchanged.

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.

Build(BuildError)

The underlying deadpool builder failed (e.g., timeouts configured without a runtime, or an invalid max-size configuration).

UnsupportedBackend(String)

A database backend that Autumn recognizes but whose runtime pool is not available in this build was configured. See DatabaseBackend.

Trait Implementations

impl Debug for PoolError

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

Formats the value using the given formatter.

impl Display for PoolError

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

Formats the value using the given formatter.

impl Error for PoolError

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<BuildError> for PoolError

fn from(source: BuildError) -> Self

Converts to this type from the input type.

impl From<PoolError> for SeedContextError

fn from(source: PoolError) -> Self

Converts to this type from the input type.