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lib.rs
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lib.rs
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#![warn(missing_docs)]
//! Extension of `xray-lite` for [AWS SDK for Rust](https://aws.amazon.com/sdk-for-rust/).
//!
//! With this crate, you can easily add the X-Ray tracing capability to your
//! AWS service requests through
//! [AWS SDK for Rust](https://aws.amazon.com/sdk-for-rust/).
//! It utilizes the [interceptor](https://docs.rs/aws-smithy-runtime-api/latest/aws_smithy_runtime_api/client/interceptors/trait.Intercept.html)
//! which can be attached to `CustomizableOperation` available via the
//! `customize` method of any request builder; e.g.,
//! [`aws_sdk_s3::operation::get_object::builders::GetObjectFluentBuilder::customize`](https://docs.rs/aws-sdk-s3/latest/aws_sdk_s3/operation/get_object/builders/struct.GetObjectFluentBuilder.html#method.customize)
//!
//! The following example shows how to report a subsegment for each attempt of
//! the S3 GetObject operation:
//! ```no_run
//! use aws_config::BehaviorVersion;
//! use xray_lite::{Client, SubsegmentContext};
//! use xray_lite_aws_sdk::ContextExt as _;
//!
//! async fn get_object_from_s3() {
//! let xray_client = Client::from_lambda_env().unwrap();
//! let xray_context = SubsegmentContext::from_lambda_env(xray_client).unwrap();
//!
//! let config = aws_config::load_defaults(BehaviorVersion::latest()).await;
//! let s3_client = aws_sdk_s3::Client::new(&config);
//! s3_client
//! .get_object()
//! .bucket("the-bucket-name")
//! .key("the-object-key")
//! .customize()
//! .interceptor(xray_context.intercept_operation("S3", "GetObject"))
//! .send()
//! .await
//! .unwrap();
//! }
//! ```
use std::sync::{Arc, Mutex};
use aws_smithy_runtime_api::box_error::BoxError;
use aws_smithy_runtime_api::client::interceptors::context::{
BeforeTransmitInterceptorContextMut, BeforeTransmitInterceptorContextRef,
FinalizerInterceptorContextRef,
};
use aws_smithy_runtime_api::client::interceptors::Intercept;
use aws_smithy_runtime_api::client::runtime_components::RuntimeComponents;
use aws_smithy_types::config_bag::ConfigBag;
use aws_types::request_id::RequestId;
use xray_lite::{AwsNamespace, Context, Header, SubsegmentSession};
/// Extension of [`Context`].
///
/// This trait is automatically implemented for any [`Context`] that satisfies
/// the bounds.
pub trait ContextExt: Context + Clone + std::fmt::Debug + Send + Sync + 'static {
/// Creates an [`Intercept`](https://docs.rs/aws-smithy-runtime-api/1.1.7/aws_smithy_runtime_api/client/interceptors/trait.Intercept.html)
/// for the AWS service request.
///
/// A returned `Intercept` implements the following hooks:
/// 1. [`read_before_attempt`](https://docs.rs/aws-smithy-runtime-api/1.1.7/aws_smithy_runtime_api/client/interceptors/trait.Intercept.html#method.read_before_attempt):
/// Starts a subsegment of the AWS service request
/// 2. [`modify_before_transmit`](https://docs.rs/aws-smithy-runtime-api/1.1.7/aws_smithy_runtime_api/client/interceptors/trait.Intercept.html#method.modify_before_transmit):
/// Injects the `X-Amzn-Trace-Id` header into the request
/// 3. [`read_after_attempt`](https://docs.rs/aws-smithy-runtime-api/1.1.7/aws_smithy_runtime_api/client/interceptors/trait.Intercept.html#method.read_after_attempt):
/// Updates the subsegment with the request ID and the response status,
/// and reports the subsegment to the X-Ray daemon
fn intercept_operation(
&self,
service: impl Into<String>,
operation: impl Into<String>,
) -> impl Intercept + 'static {
XrayIntercept::new_with_operation(self.clone(), service, operation)
}
}
impl<T> ContextExt for T where T: Context + Clone + std::fmt::Debug + Send + Sync + 'static {}
#[derive(Debug)]
struct XrayIntercept<T>
where
T: Context + Clone + std::fmt::Debug + Send + Sync + 'static,
{
context: T,
service: String,
operation: String,
// session is unnecessarily wrapped in Mutex because `Intercept` is
// immutable during its method calls.
session: Arc<Mutex<Option<SubsegmentSession<AwsNamespace>>>>,
}
impl<T> XrayIntercept<T>
where
T: Context + Clone + std::fmt::Debug + Send + Sync + 'static,
{
fn new_with_operation(
context: T,
service: impl Into<String>,
operation: impl Into<String>,
) -> Self {
Self {
context,
service: service.into(),
operation: operation.into(),
session: Arc::new(Mutex::new(None)),
}
}
}
impl<T> Intercept for XrayIntercept<T>
where
T: Context + Clone + std::fmt::Debug + Send + Sync + 'static,
{
fn name(&self) -> &'static str {
"XrayIntercept"
}
fn read_before_attempt(
&self,
_context: &BeforeTransmitInterceptorContextRef<'_>,
_runtime_components: &RuntimeComponents,
_cfg: &mut ConfigBag,
) -> Result<(), BoxError> {
let session = self.context.enter_subsegment(AwsNamespace::new(
self.service.clone(),
self.operation.clone(),
));
*self.session.lock().unwrap() = Some(session);
Ok(())
}
fn modify_before_transmit(
&self,
context: &mut BeforeTransmitInterceptorContextMut<'_>,
_runtime_components: &RuntimeComponents,
_cfg: &mut ConfigBag,
) -> Result<(), BoxError> {
let trace_id = self
.session
.lock()
.unwrap()
.as_ref()
.and_then(|s| s.x_amzn_trace_id());
if let Some(trace_id) = trace_id {
context
.request_mut()
.headers_mut()
.insert(Header::NAME, trace_id);
}
Ok(())
}
fn read_after_attempt(
&self,
context: &FinalizerInterceptorContextRef<'_>,
_runtime_components: &RuntimeComponents,
_cfg: &mut ConfigBag,
) -> Result<(), BoxError> {
let mut session = self.session.lock().unwrap();
if let Some(mut session) = session.take() {
if let Some(namespace) = session.namespace_mut() {
if let Some(response) = context.response() {
namespace.response_status(response.status().as_u16());
if let Some(request_id) = response.request_id() {
namespace.request_id(request_id);
}
}
}
}
Ok(())
}
}