Enum Error 

#[non_exhaustive]
pub enum Error {
    InvalidRequest {
        field: String,
        detail: String,
    },
    Transfer {
        kind: TransferErrorKind,
        detail: String,
    },
    Unsupported {
        feature: Feature,
        exchange: &'static str,
        detail: String,
    },
    Adapter {
        detail: String,
    },
    Auth {
        detail: String,
    },
    Exchange {
        exchange: &'static str,
        code: String,
        message: String,
        status: Option<u16>,
        kind: ExchangeErrorKind,
    },
    Transport {
        detail: String,
    },
    Decode {
        detail: String,
    },
}

Local request, adapter, authentication, exchange, transport, and decoding failures.

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

A request field failed validation.

Retrying the same request unchanged returns the same error.

Fields

field: String

The request field that failed validation.

detail: String

What was wrong with it.

Transfer

A cross-exchange transfer failed local safety validation.

Fields

kind: TransferErrorKind

Stable transfer failure category.

detail: String

Human-readable validation detail.

Unsupported

The adapter does not map this feature or request shape.

Retrying the same request or adding credentials cannot change this result. The exchange may still expose a native API outside maxt.

Fields

feature: Feature

The unmapped feature.

exchange: &'static str

The configured exchange.

detail: String

Mapping details and any available alternative.

Adapter

An adapter or foreign dispatcher violated the Adapter contract.

Fields

detail: String

What contract boundary failed.

Auth

A credentialed request could not be built locally, so none was sent.

Fields

detail: String

Credential or signing failure.

Exchange

Error response from the exchange, including rejected credentials.

Fields

exchange: &'static str

The exchange that answered.

code: String

Provider error code or event name.

message: String

Provider error message.

status: Option<u16>

HTTP status when available.

kind: ExchangeErrorKind

How the error classifies for retry purposes.

Transport

The request never completed: DNS, TLS, socket, or timeout.

Fields

detail: String

What failed about the connection.

Decode

The response payload could not be decoded.

Fields

detail: String

Decode failure.

Implementations

impl Error

pub fn is_retryable(&self) -> bool

Whether retrying the identical request could plausibly succeed.

Returns true for rate limits, exchange unavailability, and transport failures. A rejected request is false, even when rebuilding a request with a fresh timestamp could succeed.

pub fn is_rate_limited(&self) -> bool

Whether the exchange refused because the caller sent requests too fast.

Worth branching on separately from Error::is_retryable: a rate limit asks for a longer pause than a transport blip does.

pub fn adapter(detail: impl Into<String>) -> Self

Builds an adapter contract error.

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

Formats the value using the given formatter.

impl Display for Error

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

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 PartialEq for Error

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Error