aws_smithy_runtime_api/client/result.rs
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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
//! Types for [error](SdkError) responses.
use crate::client::connection::ConnectionMetadata;
use aws_smithy_types::error::metadata::{ProvideErrorMetadata, EMPTY_ERROR_METADATA};
use aws_smithy_types::error::operation::BuildError;
use aws_smithy_types::error::ErrorMetadata;
use aws_smithy_types::retry::ErrorKind;
use std::error::Error;
use std::fmt;
use std::fmt::{Debug, Display, Formatter};
type BoxError = Box<dyn Error + Send + Sync>;
/// Builders for `SdkError` variant context.
pub mod builders {
use super::*;
macro_rules! source_only_error_builder {
($errorName:ident, $builderName:ident, $sourceType:ident) => {
#[doc = concat!("Builder for [`", stringify!($errorName), "`](super::", stringify!($errorName), ").")]
#[derive(Debug, Default)]
pub struct $builderName {
source: Option<$sourceType>,
}
impl $builderName {
#[doc = "Creates a new builder."]
pub fn new() -> Self { Default::default() }
#[doc = "Sets the error source."]
pub fn source(mut self, source: impl Into<$sourceType>) -> Self {
self.source = Some(source.into());
self
}
#[doc = "Sets the error source."]
pub fn set_source(&mut self, source: Option<$sourceType>) -> &mut Self {
self.source = source;
self
}
#[doc = "Builds the error context."]
pub fn build(self) -> $errorName {
$errorName { source: self.source.expect("source is required") }
}
}
};
}
source_only_error_builder!(ConstructionFailure, ConstructionFailureBuilder, BoxError);
source_only_error_builder!(TimeoutError, TimeoutErrorBuilder, BoxError);
source_only_error_builder!(DispatchFailure, DispatchFailureBuilder, ConnectorError);
/// Builder for [`ResponseError`].
#[derive(Debug)]
pub struct ResponseErrorBuilder<R> {
source: Option<BoxError>,
raw: Option<R>,
}
impl<R> Default for ResponseErrorBuilder<R> {
fn default() -> Self {
Self {
source: None,
raw: None,
}
}
}
impl<R> ResponseErrorBuilder<R> {
/// Creates a new builder.
pub fn new() -> Self {
Default::default()
}
/// Sets the error source.
pub fn source(mut self, source: impl Into<BoxError>) -> Self {
self.source = Some(source.into());
self
}
/// Sets the error source.
pub fn set_source(&mut self, source: Option<BoxError>) -> &mut Self {
self.source = source;
self
}
/// Sets the raw response.
pub fn raw(mut self, raw: R) -> Self {
self.raw = Some(raw);
self
}
/// Sets the raw response.
pub fn set_raw(&mut self, raw: Option<R>) -> &mut Self {
self.raw = raw;
self
}
/// Builds the error context.
pub fn build(self) -> ResponseError<R> {
ResponseError {
source: self.source.expect("source is required"),
raw: self.raw.expect("a raw response is required"),
}
}
}
/// Builder for [`ServiceError`].
#[derive(Debug)]
pub struct ServiceErrorBuilder<E, R> {
source: Option<E>,
raw: Option<R>,
}
impl<E, R> Default for ServiceErrorBuilder<E, R> {
fn default() -> Self {
Self {
source: None,
raw: None,
}
}
}
impl<E, R> ServiceErrorBuilder<E, R> {
/// Creates a new builder.
pub fn new() -> Self {
Default::default()
}
/// Sets the error source.
pub fn source(mut self, source: impl Into<E>) -> Self {
self.source = Some(source.into());
self
}
/// Sets the error source.
pub fn set_source(&mut self, source: Option<E>) -> &mut Self {
self.source = source;
self
}
/// Sets the raw response.
pub fn raw(mut self, raw: R) -> Self {
self.raw = Some(raw);
self
}
/// Sets the raw response.
pub fn set_raw(&mut self, raw: Option<R>) -> &mut Self {
self.raw = raw;
self
}
/// Builds the error context.
pub fn build(self) -> ServiceError<E, R> {
ServiceError {
source: self.source.expect("source is required"),
raw: self.raw.expect("a raw response is required"),
}
}
}
}
/// Error context for [`SdkError::ConstructionFailure`]
#[derive(Debug)]
pub struct ConstructionFailure {
pub(crate) source: BoxError,
}
impl ConstructionFailure {
/// Creates a builder for this error context type.
pub fn builder() -> builders::ConstructionFailureBuilder {
builders::ConstructionFailureBuilder::new()
}
}
/// Error context for [`SdkError::TimeoutError`]
#[derive(Debug)]
pub struct TimeoutError {
source: BoxError,
}
impl TimeoutError {
/// Creates a builder for this error context type.
pub fn builder() -> builders::TimeoutErrorBuilder {
builders::TimeoutErrorBuilder::new()
}
}
/// Error context for [`SdkError::DispatchFailure`]
#[derive(Debug)]
pub struct DispatchFailure {
source: ConnectorError,
}
impl DispatchFailure {
/// Creates a builder for this error context type.
pub fn builder() -> builders::DispatchFailureBuilder {
builders::DispatchFailureBuilder::new()
}
/// Returns true if the error is an IO error
pub fn is_io(&self) -> bool {
self.source.is_io()
}
/// Returns true if the error is an timeout error
pub fn is_timeout(&self) -> bool {
self.source.is_timeout()
}
/// Returns true if the error is a user-caused error (e.g., invalid HTTP request)
pub fn is_user(&self) -> bool {
self.source.is_user()
}
/// Returns true if the error is an unclassified error.
pub fn is_other(&self) -> bool {
self.source.is_other()
}
/// Returns the optional error kind associated with an unclassified error
pub fn as_other(&self) -> Option<ErrorKind> {
self.source.as_other()
}
/// Returns the inner error if it is a connector error
pub fn as_connector_error(&self) -> Option<&ConnectorError> {
Some(&self.source)
}
}
/// Error context for [`SdkError::ResponseError`]
#[derive(Debug)]
pub struct ResponseError<R> {
/// Error encountered while parsing the response
source: BoxError,
/// Raw response that was available
raw: R,
}
impl<R> ResponseError<R> {
/// Creates a builder for this error context type.
pub fn builder() -> builders::ResponseErrorBuilder<R> {
builders::ResponseErrorBuilder::new()
}
/// Returns a reference to the raw response
pub fn raw(&self) -> &R {
&self.raw
}
/// Converts this error context into the raw response
pub fn into_raw(self) -> R {
self.raw
}
}
/// Error context for [`SdkError::ServiceError`]
#[derive(Debug)]
pub struct ServiceError<E, R> {
/// Modeled service error
source: E,
/// Raw response from the service
raw: R,
}
impl<E, R> ServiceError<E, R> {
/// Creates a builder for this error context type.
pub fn builder() -> builders::ServiceErrorBuilder<E, R> {
builders::ServiceErrorBuilder::new()
}
/// Returns the underlying error of type `E`
pub fn err(&self) -> &E {
&self.source
}
/// Converts this error context into the underlying error `E`
pub fn into_err(self) -> E {
self.source
}
/// Returns a reference to the raw response
pub fn raw(&self) -> &R {
&self.raw
}
/// Converts this error context into the raw response
pub fn into_raw(self) -> R {
self.raw
}
}
/// Constructs the unhandled variant of a code generated error.
///
/// This trait exists so that [`SdkError::into_service_error`] can be infallible.
pub trait CreateUnhandledError {
/// Creates an unhandled error variant with the given `source` and error metadata.
fn create_unhandled_error(
source: Box<dyn Error + Send + Sync + 'static>,
meta: Option<ErrorMetadata>,
) -> Self;
}
/// Failed SDK Result
///
/// When logging an error from the SDK, it is recommended that you either wrap the error in
/// [`DisplayErrorContext`](aws_smithy_types::error::display::DisplayErrorContext), use another
/// error reporter library that visits the error's cause/source chain, or call
/// [`Error::source`] for more details about the underlying cause.
#[non_exhaustive]
#[derive(Debug)]
pub enum SdkError<E, R> {
/// The request failed during construction. It was not dispatched over the network.
ConstructionFailure(ConstructionFailure),
/// The request failed due to a timeout. The request MAY have been sent and received.
TimeoutError(TimeoutError),
/// The request failed during dispatch. An HTTP response was not received. The request MAY
/// have been sent.
DispatchFailure(DispatchFailure),
/// A response was received but it was not parseable according the the protocol (for example
/// the server hung up without sending a complete response)
ResponseError(ResponseError<R>),
/// An error response was received from the service
ServiceError(ServiceError<E, R>),
}
impl<E, R> SdkError<E, R> {
/// Construct a `SdkError` for a construction failure
pub fn construction_failure(source: impl Into<BoxError>) -> Self {
Self::ConstructionFailure(ConstructionFailure {
source: source.into(),
})
}
/// Construct a `SdkError` for a timeout
pub fn timeout_error(source: impl Into<BoxError>) -> Self {
Self::TimeoutError(TimeoutError {
source: source.into(),
})
}
/// Construct a `SdkError` for a dispatch failure with a [`ConnectorError`]
pub fn dispatch_failure(source: ConnectorError) -> Self {
Self::DispatchFailure(DispatchFailure { source })
}
/// Construct a `SdkError` for a response error
pub fn response_error(source: impl Into<BoxError>, raw: R) -> Self {
Self::ResponseError(ResponseError {
source: source.into(),
raw,
})
}
/// Construct a `SdkError` for a service failure
pub fn service_error(source: E, raw: R) -> Self {
Self::ServiceError(ServiceError { source, raw })
}
/// Returns the underlying service error `E` if there is one
///
/// If the `SdkError` is not a `ServiceError` (for example, the error is a network timeout),
/// then it will be converted into an unhandled variant of `E`. This makes it easy to match
/// on the service's error response while simultaneously bubbling up transient failures.
/// For example, handling the `NoSuchKey` error for S3's `GetObject` operation may look as
/// follows:
///
/// ```no_run
/// # use aws_smithy_runtime_api::client::result::{SdkError, CreateUnhandledError};
/// # #[derive(Debug)] enum GetObjectError { NoSuchKey(()), Other(()) }
/// # impl std::fmt::Display for GetObjectError {
/// # fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { unimplemented!() }
/// # }
/// # impl std::error::Error for GetObjectError {}
/// # impl CreateUnhandledError for GetObjectError {
/// # fn create_unhandled_error(
/// # _: Box<dyn std::error::Error + Send + Sync + 'static>,
/// # _: Option<aws_smithy_types::error::ErrorMetadata>,
/// # ) -> Self { unimplemented!() }
/// # }
/// # fn example() -> Result<(), GetObjectError> {
/// # let sdk_err = SdkError::service_error(GetObjectError::NoSuchKey(()), ());
/// match sdk_err.into_service_error() {
/// GetObjectError::NoSuchKey(_) => {
/// // handle NoSuchKey
/// }
/// err @ _ => return Err(err),
/// }
/// # Ok(())
/// # }
/// ```
pub fn into_service_error(self) -> E
where
E: std::error::Error + Send + Sync + CreateUnhandledError + 'static,
R: Debug + Send + Sync + 'static,
{
match self {
Self::ServiceError(context) => context.source,
_ => E::create_unhandled_error(self.into(), None),
}
}
/// Returns a reference underlying service error `E` if there is one
///
/// # Examples
/// ```no_run
/// # use aws_smithy_runtime_api::client::result::SdkError;
/// # #[derive(Debug)] enum GetObjectError { NoSuchKey(()), Other(()) }
/// # impl std::fmt::Display for GetObjectError {
/// # fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { unimplemented!() }
/// # }
/// # impl std::error::Error for GetObjectError {}
/// # impl GetObjectError {
/// # fn is_not_found(&self) -> bool { true }
/// # }
/// # fn example() -> Result<(), GetObjectError> {
/// # let sdk_err = SdkError::service_error(GetObjectError::NoSuchKey(()), ());
/// if sdk_err.as_service_error().map(|e|e.is_not_found()) == Some(true) {
/// println!("the object doesn't exist");
/// // return None, or handle this error specifically
/// }
/// // ... handle other error cases, happy path, etc.
/// # Ok(())
/// # }
/// ```
pub fn as_service_error(&self) -> Option<&E> {
match self {
Self::ServiceError(err) => Some(&err.source),
_ => None,
}
}
/// Converts this error into its error source.
///
/// If there is no error source, then `Err(Self)` is returned.
pub fn into_source(self) -> Result<Box<dyn Error + Send + Sync + 'static>, Self>
where
E: std::error::Error + Send + Sync + 'static,
{
match self {
SdkError::ConstructionFailure(context) => Ok(context.source),
SdkError::TimeoutError(context) => Ok(context.source),
SdkError::ResponseError(context) => Ok(context.source),
SdkError::DispatchFailure(context) => Ok(context.source.into()),
SdkError::ServiceError(context) => Ok(context.source.into()),
}
}
/// Return a reference to this error's raw response, if it contains one. Otherwise, return `None`.
pub fn raw_response(&self) -> Option<&R> {
match self {
SdkError::ServiceError(inner) => Some(inner.raw()),
SdkError::ResponseError(inner) => Some(inner.raw()),
_ => None,
}
}
/// Maps the service error type in `SdkError::ServiceError`
pub fn map_service_error<E2>(self, map: impl FnOnce(E) -> E2) -> SdkError<E2, R> {
match self {
SdkError::ServiceError(context) => SdkError::<E2, R>::ServiceError(ServiceError {
source: map(context.source),
raw: context.raw,
}),
SdkError::ConstructionFailure(context) => {
SdkError::<E2, R>::ConstructionFailure(context)
}
SdkError::DispatchFailure(context) => SdkError::<E2, R>::DispatchFailure(context),
SdkError::ResponseError(context) => SdkError::<E2, R>::ResponseError(context),
SdkError::TimeoutError(context) => SdkError::<E2, R>::TimeoutError(context),
}
}
}
impl<E, R> Display for SdkError<E, R> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
match self {
SdkError::ConstructionFailure(_) => write!(f, "failed to construct request"),
SdkError::TimeoutError(_) => write!(f, "request has timed out"),
SdkError::DispatchFailure(_) => write!(f, "dispatch failure"),
SdkError::ResponseError(_) => write!(f, "response error"),
SdkError::ServiceError(_) => write!(f, "service error"),
}
}
}
impl<E, R> Error for SdkError<E, R>
where
E: Error + 'static,
R: Debug,
{
fn source(&self) -> Option<&(dyn Error + 'static)> {
match self {
SdkError::ConstructionFailure(context) => Some(context.source.as_ref()),
SdkError::TimeoutError(context) => Some(context.source.as_ref()),
SdkError::ResponseError(context) => Some(context.source.as_ref()),
SdkError::DispatchFailure(context) => Some(&context.source),
SdkError::ServiceError(context) => Some(&context.source),
}
}
}
impl<E, R> From<BuildError> for SdkError<E, R> {
fn from(value: BuildError) -> Self {
SdkError::ConstructionFailure(ConstructionFailure::builder().source(value).build())
}
}
impl<E, R> ProvideErrorMetadata for SdkError<E, R>
where
E: ProvideErrorMetadata,
{
fn meta(&self) -> &aws_smithy_types::error::ErrorMetadata {
match self {
SdkError::ConstructionFailure(_) => &EMPTY_ERROR_METADATA,
SdkError::TimeoutError(_) => &EMPTY_ERROR_METADATA,
SdkError::DispatchFailure(_) => &EMPTY_ERROR_METADATA,
SdkError::ResponseError(_) => &EMPTY_ERROR_METADATA,
SdkError::ServiceError(err) => err.source.meta(),
}
}
}
#[derive(Debug)]
enum ConnectorErrorKind {
/// A timeout occurred while processing the request
Timeout,
/// A user-caused error (e.g., invalid HTTP request)
User,
/// Socket/IO error
Io,
/// An unclassified Error with an explicit error kind
Other(Option<ErrorKind>),
}
/// Error from the underlying Connector
///
/// Connector exists to attach a `ConnectorErrorKind` to what would otherwise be an opaque `Box<dyn Error>`
/// that comes off a potentially generic or dynamic connector.
/// The attached `kind` is used to determine what retry behavior should occur (if any) based on the
/// connector error.
#[derive(Debug)]
pub struct ConnectorError {
kind: ConnectorErrorKind,
source: BoxError,
connection: ConnectionStatus,
}
#[non_exhaustive]
#[derive(Debug)]
pub(crate) enum ConnectionStatus {
/// This request was never connected to the remote
///
/// This indicates the failure was during connection establishment
NeverConnected,
/// It is unknown whether a connection was established
Unknown,
/// The request connected to the remote prior to failure
Connected(ConnectionMetadata),
}
impl Display for ConnectorError {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
match self.kind {
ConnectorErrorKind::Timeout => write!(f, "timeout"),
ConnectorErrorKind::User => write!(f, "user error"),
ConnectorErrorKind::Io => write!(f, "io error"),
ConnectorErrorKind::Other(_) => write!(f, "other"),
}
}
}
impl Error for ConnectorError {
fn source(&self) -> Option<&(dyn Error + 'static)> {
Some(self.source.as_ref())
}
}
impl ConnectorError {
/// Construct a [`ConnectorError`] from an error caused by a timeout
///
/// Timeout errors are typically retried on a new connection.
pub fn timeout(source: BoxError) -> Self {
Self {
kind: ConnectorErrorKind::Timeout,
source,
connection: ConnectionStatus::Unknown,
}
}
/// Include connection information along with this error
pub fn with_connection(mut self, info: ConnectionMetadata) -> Self {
self.connection = ConnectionStatus::Connected(info);
self
}
/// Set the connection status on this error to report that a connection was never established
pub fn never_connected(mut self) -> Self {
self.connection = ConnectionStatus::NeverConnected;
self
}
/// Construct a [`ConnectorError`] from an error caused by the user (e.g. invalid HTTP request)
pub fn user(source: BoxError) -> Self {
Self {
kind: ConnectorErrorKind::User,
source,
connection: ConnectionStatus::Unknown,
}
}
/// Construct a [`ConnectorError`] from an IO related error (e.g. socket hangup)
pub fn io(source: BoxError) -> Self {
Self {
kind: ConnectorErrorKind::Io,
source,
connection: ConnectionStatus::Unknown,
}
}
/// Construct a [`ConnectorError`] from an different unclassified error.
///
/// Optionally, an explicit `Kind` may be passed.
pub fn other(source: BoxError, kind: Option<ErrorKind>) -> Self {
Self {
source,
kind: ConnectorErrorKind::Other(kind),
connection: ConnectionStatus::Unknown,
}
}
/// Returns true if the error is an IO error
pub fn is_io(&self) -> bool {
matches!(self.kind, ConnectorErrorKind::Io)
}
/// Returns true if the error is an timeout error
pub fn is_timeout(&self) -> bool {
matches!(self.kind, ConnectorErrorKind::Timeout)
}
/// Returns true if the error is a user-caused error (e.g., invalid HTTP request)
pub fn is_user(&self) -> bool {
matches!(self.kind, ConnectorErrorKind::User)
}
/// Returns true if the error is an unclassified error.
pub fn is_other(&self) -> bool {
matches!(self.kind, ConnectorErrorKind::Other(..))
}
/// Returns the optional error kind associated with an unclassified error
pub fn as_other(&self) -> Option<ErrorKind> {
match &self.kind {
ConnectorErrorKind::Other(ek) => *ek,
_ => None,
}
}
/// Grants ownership of this error's source.
pub fn into_source(self) -> BoxError {
self.source
}
/// Returns metadata about the connection
///
/// If a connection was established and provided by the internal connector, a connection will
/// be returned.
pub fn connection_metadata(&self) -> Option<&ConnectionMetadata> {
match &self.connection {
ConnectionStatus::NeverConnected => None,
ConnectionStatus::Unknown => None,
ConnectionStatus::Connected(conn) => Some(conn),
}
}
}