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use crate::SendOperationError;
use aws_smithy_http::middleware::load_response;
use aws_smithy_http::operation;
use aws_smithy_http::operation::Operation;
use aws_smithy_http::response::ParseHttpResponse;
use aws_smithy_http::result::SdkError;
use std::error::Error;
use std::future::Future;
use std::marker::PhantomData;
use std::pin::Pin;
use std::task::{Context, Poll};
use tower::{Layer, Service};
use tracing::field::display;
use tracing::{debug_span, field, info_span, Instrument};
#[derive(Clone)]
pub struct ParseResponseService<S, O, R> {
inner: S,
_output_type: PhantomData<(O, R)>,
}
#[derive(Default)]
pub struct ParseResponseLayer<O, R> {
_output_type: PhantomData<(O, R)>,
}
impl<O, R> ParseResponseLayer<O, R> {
pub fn new() -> Self {
ParseResponseLayer {
_output_type: Default::default(),
}
}
}
impl<S, O, R> Layer<S> for ParseResponseLayer<O, R>
where
S: Service<operation::Request, Response = operation::Response>,
{
type Service = ParseResponseService<S, O, R>;
fn layer(&self, inner: S) -> Self::Service {
ParseResponseService {
inner,
_output_type: Default::default(),
}
}
}
type BoxedResultFuture<T, E> = Pin<Box<dyn Future<Output = Result<T, E>> + Send>>;
impl<S, O, T, E, R> tower::Service<operation::Operation<O, R>> for ParseResponseService<S, O, R>
where
S: Service<operation::Request, Response = operation::Response, Error = SendOperationError>,
S::Future: Send + 'static,
O: ParseHttpResponse<Output = Result<T, E>> + Send + Sync + 'static,
E: Error,
{
type Response = aws_smithy_http::result::SdkSuccess<T>;
type Error = aws_smithy_http::result::SdkError<E>;
type Future = BoxedResultFuture<Self::Response, Self::Error>;
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
self.inner.poll_ready(cx).map_err(|err| err.into())
}
fn call(&mut self, req: Operation<O, R>) -> Self::Future {
let (req, parts) = req.into_request_response();
let handler = parts.response_handler;
let span = info_span!(
"send_operation",
operation = field::Empty,
service = field::Empty,
status = field::Empty,
message = field::Empty
);
let inner_span = span.clone();
if let Some(metadata) = parts.metadata {
span.record("operation", &metadata.name());
span.record("service", &metadata.service());
}
let resp = self.inner.call(req);
let fut = async move {
let resp = match resp.await {
Err(e) => Err(e.into()),
Ok(resp) => {
let response_span = debug_span!("load_response");
load_response(resp, &handler)
.instrument(response_span)
.await
}
};
match &resp {
Ok(_) => inner_span.record("status", &"ok"),
Err(SdkError::ServiceError { err, .. }) => inner_span
.record("status", &"service_err")
.record("message", &display(&err)),
Err(SdkError::ResponseError { err, .. }) => inner_span
.record("status", &"response_err")
.record("message", &display(&err)),
Err(SdkError::DispatchFailure(err)) => inner_span
.record("status", &"dispatch_failure")
.record("message", &display(err)),
Err(SdkError::ConstructionFailure(err)) => inner_span
.record("status", &"construction_failure")
.record("message", &display(err)),
};
resp
}
.instrument(span);
Box::pin(fut)
}
}