Enum EngineError 

pub enum EngineError {
    UnknownSource {
        name: String,
        configured: String,
    },
    Token {
        message: String,
    },
    NoSources,
    NotWritable {
        name: String,
        kind: String,
    },
    DestinationUnavailable {
        name: String,
        error: SourceError,
    },
    NoSuchItem {
        id: String,
    },
    StaleOrigin {
        item: String,
        origin: String,
    },
    SourceRefused {
        name: String,
        error: SourceError,
    },
}

What the engine refuses before it asks any source.

Distinct from a SourceFailure, which is one source failing while the others answer: everything here means the request itself cannot be run at all.

Eq is deliberately absent: three variants carry the SourceError the source itself gave, which is what a user has to act on, and that type is PartialEq alone.

Variants

UnknownSource

A --source named something no configuration configures.

Fields

name: String

The name that was asked for.

configured: String

The names that exist, for the message.

Token

A --page token that decodes but does not belong to this query.

Fields

message: String

What the token claims that this configuration cannot honour.

NoSources

Nothing at all is configured, so there is nothing to ask.

NotWritable

A copy named a destination whose plugin has no write side.

Fields

name: String

The configured name of the destination.

kind: String

The plugin behind it.

DestinationUnavailable

A copy named a destination that is configured but could not be built.

Fields

name: String

The configured name of the destination.

error: SourceError

Why it did not build.

NoSuchItem

A copy named an id its own source does not hold.

Fields

id: String

The qualified id that named nothing.

StaleOrigin

An item’s recorded origin names an item the destination no longer holds.

Refused rather than created: the destination item was deleted or moved on purpose, and creating a second one there would duplicate work somebody removed.

Fields

item: String

The item being copied.

origin: String

The origin it records.

SourceRefused

A source refused something the copy asked of it.

Distinct from a SourceFailure, which leaves the other sources’ results standing: a copy is one write into one destination, and half of one is not an answer.

Fields

name: String

The source that refused.

error: SourceError

What it said.

Trait Implementations

impl Clone for EngineError

fn clone(&self) -> EngineError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EngineError

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

Formats the value using the given formatter.

impl Display for EngineError

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

Formats the value using the given formatter.

impl Error for EngineError

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 PartialEq for EngineError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for EngineError