feat: derive(Debug) on ClientBuilder

* Add support for `opentelemetry` version `0.21`

* Fix tracer provider import

.cargo/audit.toml

@@ -0,0 +1,6 @@
+# See https://github.com/rustsec/rustsec/blob/59e1d2ad0b9cbc6892c26de233d4925074b4b97b/cargo-audit/audit.toml.example for example.
+
+[advisories]
+ignore = [
+    "RUSTSEC-2020-0159",
+]

.github/workflows/ci.yml

@@ -16,6 +16,11 @@ jobs:
           - opentelemetry_0_14
           - opentelemetry_0_15
           - opentelemetry_0_16
+          - opentelemetry_0_17
+          - opentelemetry_0_18
+          - opentelemetry_0_19
+          - opentelemetry_0_20
+          - opentelemetry_0_21
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -59,6 +64,11 @@ jobs:
           - opentelemetry_0_14
           - opentelemetry_0_15
           - opentelemetry_0_16
+          - opentelemetry_0_17
+          - opentelemetry_0_18
+          - opentelemetry_0_19
+          - opentelemetry_0_20
+          - opentelemetry_0_21
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -85,6 +95,11 @@ jobs:
           - opentelemetry_0_14
           - opentelemetry_0_15
           - opentelemetry_0_16
+          - opentelemetry_0_17
+          - opentelemetry_0_18
+          - opentelemetry_0_19
+          - opentelemetry_0_20
+          - opentelemetry_0_21
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -125,27 +140,3 @@ jobs:
         with:
           command: publish
           args: --dry-run --manifest-path reqwest-tracing/Cargo.toml
-
-  coverage:
-    name: Code coverage
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v2
-      - name: Install stable toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          profile: minimal
-          override: true
-      - name: Run cargo-tarpaulin
-        uses: actions-rs/tarpaulin@v0.1
-        with:
-          args: '--ignore-tests --out Lcov'
-      - name: Upload to Coveralls
-        # upload only if push
-        if: ${{ github.event_name == 'push' }}
-        uses: coverallsapp/github-action@master
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          path-to-lcov: './lcov.info'

.gitignore

@@ -1,2 +1,10 @@
-/target
+# OS
+.DS_Store
+
+# IDE
+.idea/
+.vscode/
+
+# Rust
 Cargo.lock
+/target

CHANGELOG.md

@@ -4,7 +4,53 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+### [0.2.4] - 2023-09-21
+
+### Added
+- Added `fetch_mode_no_cors` method to `reqwest_middleware::RequestBuilder`
+
+## [0.2.3] - 2023-08-07
+
+### Added
+- Added all `reqwest::Error` methods for `reqwest_middleware::Error`
+
+## [0.2.2] - 2023-05-11
+
+### Added
+- `RequestBuilder::version` method to configure the HTTP version
+
+## [0.2.1] - 2023-03-09
+
+### Added
+- Support for `wasm32-unknown-unknown`
+
+## [0.2.0] - 2022-11-15
+
+### Changed
+- `RequestBuilder::try_clone` has a fixed function signature now
+
+### Removed
+- `RequestBuilder::send_with_extensions` - use `RequestBuilder::with_extensions` + `RequestBuilder::send` instead.
+
+### Added
+- Implementation of `Debug` trait for `RequestBuilder`.
+- A new `RequestInitialiser` trait that can be added to `ClientWithMiddleware`
+- A new `Extension` initialiser that adds extensions to each request
+- Adds `with_extension` method functionality to `RequestBuilder` that can add extensions for the `send` method to use.
+
+## [0.1.6] - 2022-04-21
+
+Absolutely nothing changed
+
+## [0.1.5] - 2022-02-21
+
+### Added
+- Added support for `opentelemetry` version `0.17`.
+
+## [0.1.4] - 2022-01-24
+
+### Changed
+- Made `Debug` impl for `ClientWithExtensions` non-exhaustive.
 
 ## [0.1.3] - 2021-10-18
 

README.md

@@ -15,6 +15,11 @@ implementations. This repository also contains a couple of useful concrete middl
 * [`reqwest-tracing`](https://crates.io/crates/reqwest-tracing):
   [`tracing`](https://crates.io/crates/tracing) integration, optional opentelemetry support.
 
+Note about browser support: automated tests targetting wasm are disabled. The crate may work with
+wasm but wasm support is unmaintained. PRs improving wasm are still welcome but you'd need to
+reintroduce the tests and get them passing before we'd merge it (see
+https://github.com/TrueLayer/reqwest-middleware/pull/105).
+
 ## Overview
 
 The `reqwest-middleware` client exposes the same interface as a plain `reqwest` client, but
@@ -25,9 +30,9 @@ The `reqwest-middleware` client exposes the same interface as a plain `reqwest`
 # ...
 [dependencies]
 reqwest = "0.11"
-reqwest-middleware = "0.1.1"
+reqwest-middleware = "0.1.6"
-reqwest-retry = "0.1.1"
+reqwest-retry = "0.1.5"
-reqwest-tracing = "0.2.0"
+reqwest-tracing = "0.2.3"
 tokio = { version = "1.12.0", features = ["macros", "rt-multi-thread"] }
 ```
 
@@ -42,7 +47,7 @@ async fn main() {
     let retry_policy = ExponentialBackoff::builder().build_with_max_retries(3);
     let client = ClientBuilder::new(reqwest::Client::new())
         // Trace HTTP requests. See the tracing crate to make use of these traces.
-        .with(TracingMiddleware)
+        .with(TracingMiddleware::default())
         // Retry failed requests.
         .with(RetryTransientMiddleware::new_with_policy(retry_policy))
         .build();
@@ -73,3 +78,14 @@ Unless you explicitly state otherwise, any contribution intentionally submitted
 for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
 dual licensed as above, without any additional terms or conditions.
 </sub>
+
+## Third-party middleware
+
+The following third-party middleware use `request-middleware`:
+
+- [`reqwest-conditional-middleware`](https://github.com/oxidecomputer/reqwest-conditional-middleware) - Per-request basis middleware
+- [`http-cache`](https://github.com/06chaynes/http-cache) - HTTP caching rules
+- [`reqwest-cache`](https://gitlab.com/famedly/company/backend/libraries/reqwest-cache) - HTTP caching
+- [`aliri_reqwest`](https://github.com/neoeinstein/aliri/tree/main/aliri_reqwest) - Background token management and renewal
+- [`http-signature-normalization-reqwest`](https://crates.io/crates/http-signature-normalization-reqwest) (not free software) - HTTP Signatures
+- [`reqwest-chain`](https://github.com/tommilligan/reqwest-chain) - Apply custom criteria to any reqwest response, deciding when and how to retry.

reqwest-middleware/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "reqwest-middleware"
-version = "0.1.2"
+version = "0.2.4"
 authors = ["Rodrigo Gryzinski <rodrigo.gryzinski@truelayer.com>"]
 edition = "2018"
 description = "Wrapper around reqwest to allow for client middleware chains."
@@ -11,18 +11,17 @@ categories = ["web-programming::http-client"]
 readme = "../README.md"
 
 [dependencies]
-anyhow = "1"
+anyhow = "1.0.0"
 async-trait = "0.1.51"
-futures = "0.3"
+http = "0.2.0"
-http = "0.2"
+reqwest = { version = "0.11.4", default-features = false, features = ["json", "multipart"] }
-reqwest = { version = "0.11", default-features = false, features = ["json", "multipart"] }
+serde = "1.0.106"
-serde = "1"
+task-local-extensions = "0.1.4"
-thiserror = "1"
+thiserror = "1.0.21"
-task-local-extensions = "0.1.1"
 
 [dev-dependencies]
-reqwest = "0.11"
+reqwest = "0.11.4"
 reqwest-retry = { path = "../reqwest-retry" }
 reqwest-tracing = { path = "../reqwest-tracing" }
-wiremock = "0.5"
+tokio = { version = "1.0.0", features = ["macros", "rt-multi-thread"] }
-tokio = { version = "1", features = ["macros", "rt-multi-thread"] }
+wiremock = "0.5.0"

reqwest-middleware/src/client.rs

@@ -3,20 +3,22 @@ use reqwest::multipart::Form;
 use reqwest::{Body, Client, IntoUrl, Method, Request, Response};
 use serde::Serialize;
 use std::convert::TryFrom;
-use std::fmt::Display;
+use std::fmt::{self, Display};
 use std::sync::Arc;
-use std::time::Duration;
 use task_local_extensions::Extensions;
 
 use crate::error::Result;
 use crate::middleware::{Middleware, Next};
+use crate::RequestInitialiser;
 
 /// A `ClientBuilder` is used to build a [`ClientWithMiddleware`].
 ///
 /// [`ClientWithMiddleware`]: crate::ClientWithMiddleware
+#[derive(Debug)]
 pub struct ClientBuilder {
     client: Client,
     middleware_stack: Vec<Arc<dyn Middleware>>,
+    initialiser_stack: Vec<Arc<dyn RequestInitialiser>>,
 }
 
 impl ClientBuilder {
@@ -24,6 +26,7 @@ impl ClientBuilder {
         ClientBuilder {
             client,
             middleware_stack: Vec::new(),
+            initialiser_stack: Vec::new(),
         }
     }
 
@@ -47,9 +50,33 @@ impl ClientBuilder {
         self
     }
 
+    /// Convenience method to attach a request initialiser.
+    ///
+    /// If you need to keep a reference to the initialiser after attaching, use [`with_arc_init`].
+    ///
+    /// [`with_arc_init`]: Self::with_arc_init
+    pub fn with_init<I>(self, initialiser: I) -> Self
+    where
+        I: RequestInitialiser,
+    {
+        self.with_arc_init(Arc::new(initialiser))
+    }
+
+    /// Add a request initialiser to the chain. [`with_init`] is more ergonomic if you don't need the `Arc`.
+    ///
+    /// [`with_init`]: Self::with_init
+    pub fn with_arc_init(mut self, initialiser: Arc<dyn RequestInitialiser>) -> Self {
+        self.initialiser_stack.push(initialiser);
+        self
+    }
+
     /// Returns a `ClientWithMiddleware` using this builder configuration.
     pub fn build(self) -> ClientWithMiddleware {
-        ClientWithMiddleware::new(self.client, self.middleware_stack)
+        ClientWithMiddleware {
+            inner: self.client,
+            middleware_stack: self.middleware_stack.into_boxed_slice(),
+            initialiser_stack: self.initialiser_stack.into_boxed_slice(),
+        }
     }
 }
 
@@ -59,6 +86,7 @@ impl ClientBuilder {
 pub struct ClientWithMiddleware {
     inner: reqwest::Client,
     middleware_stack: Box<[Arc<dyn Middleware>]>,
+    initialiser_stack: Box<[Arc<dyn RequestInitialiser>]>,
 }
 
 impl ClientWithMiddleware {
@@ -70,6 +98,8 @@ impl ClientWithMiddleware {
         ClientWithMiddleware {
             inner: client,
             middleware_stack: middleware_stack.into(),
+            // TODO(conradludgate) - allow downstream code to control this manually if desired
+            initialiser_stack: Box::new([]),
         }
     }
 
@@ -105,10 +135,14 @@ impl ClientWithMiddleware {
 
     /// See [`Client::request`]
     pub fn request<U: IntoUrl>(&self, method: Method, url: U) -> RequestBuilder {
-        RequestBuilder {
+        let req = RequestBuilder {
             inner: self.inner.request(method, url),
             client: self.clone(),
-        }
+            extensions: Extensions::new(),
+        };
+        self.initialiser_stack
+            .iter()
+            .fold(req, |req, i| i.init(req))
     }
 
     /// See [`Client::execute`]
@@ -134,15 +168,26 @@ impl From<Client> for ClientWithMiddleware {
         ClientWithMiddleware {
             inner: client,
             middleware_stack: Box::new([]),
+            initialiser_stack: Box::new([]),
         }
     }
 }
 
+impl fmt::Debug for ClientWithMiddleware {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        // skipping middleware_stack field for now
+        f.debug_struct("ClientWithMiddleware")
+            .field("inner", &self.inner)
+            .finish_non_exhaustive()
+    }
+}
+
 /// This is a wrapper around [`reqwest::RequestBuilder`] exposing the same API.
 #[must_use = "RequestBuilder does nothing until you 'send' it"]
 pub struct RequestBuilder {
     inner: reqwest::RequestBuilder,
     client: ClientWithMiddleware,
+    extensions: Extensions,
 }
 
 impl RequestBuilder {
@@ -155,14 +200,22 @@ impl RequestBuilder {
     {
         RequestBuilder {
             inner: self.inner.header(key, value),
-            client: self.client,
+            ..self
         }
     }
 
     pub fn headers(self, headers: HeaderMap) -> Self {
         RequestBuilder {
             inner: self.inner.headers(headers),
-            client: self.client,
+            ..self
+        }
+    }
+
+    #[cfg(not(target_arch = "wasm32"))]
+    pub fn version(self, version: reqwest::Version) -> Self {
+        RequestBuilder {
+            inner: self.inner.version(version),
+            ..self
         }
     }
 
@@ -173,7 +226,7 @@ impl RequestBuilder {
     {
         RequestBuilder {
             inner: self.inner.basic_auth(username, password),
-            client: self.client,
+            ..self
         }
     }
 
@@ -183,49 +236,57 @@ impl RequestBuilder {
     {
         RequestBuilder {
             inner: self.inner.bearer_auth(token),
-            client: self.client,
+            ..self
         }
     }
 
     pub fn body<T: Into<Body>>(self, body: T) -> Self {
         RequestBuilder {
             inner: self.inner.body(body),
-            client: self.client,
+            ..self
         }
     }
 
-    pub fn timeout(self, timeout: Duration) -> Self {
+    #[cfg(not(target_arch = "wasm32"))]
+    pub fn timeout(self, timeout: std::time::Duration) -> Self {
         RequestBuilder {
             inner: self.inner.timeout(timeout),
-            client: self.client,
+            ..self
         }
     }
 
     pub fn multipart(self, multipart: Form) -> Self {
         RequestBuilder {
             inner: self.inner.multipart(multipart),
-            client: self.client,
+            ..self
         }
     }
 
     pub fn query<T: Serialize + ?Sized>(self, query: &T) -> Self {
         RequestBuilder {
             inner: self.inner.query(query),
-            client: self.client,
+            ..self
         }
     }
 
     pub fn form<T: Serialize + ?Sized>(self, form: &T) -> Self {
         RequestBuilder {
             inner: self.inner.form(form),
-            client: self.client,
+            ..self
         }
     }
 
     pub fn json<T: Serialize + ?Sized>(self, json: &T) -> Self {
         RequestBuilder {
             inner: self.inner.json(json),
-            client: self.client,
+            ..self
+        }
+    }
+
+    pub fn fetch_mode_no_cors(self) -> Self {
+        RequestBuilder {
+            inner: self.inner.fetch_mode_no_cors(),
+            ..self
         }
     }
 
@@ -233,21 +294,48 @@ impl RequestBuilder {
         self.inner.build()
     }
 
+    /// Inserts the extension into this request builder
+    pub fn with_extension<T: Send + Sync + 'static>(mut self, extension: T) -> Self {
+        self.extensions.insert(extension);
+        self
+    }
+
+    /// Returns a mutable reference to the internal set of extensions for this request
+    pub fn extensions(&mut self) -> &mut Extensions {
+        &mut self.extensions
+    }
+
     pub async fn send(self) -> Result<Response> {
-        let req = self.inner.build()?;
+        let Self {
-        self.client.execute(req).await
+            inner,
+            client,
+            mut extensions,
+        } = self;
+        let req = inner.build()?;
+        client.execute_with_extensions(req, &mut extensions).await
     }
 
-    /// Sends a request with initial [`Extensions`].
+    /// Attempt to clone the RequestBuilder.
-    pub async fn send_with_extensions(self, ext: &mut Extensions) -> Result<Response> {
+    ///
-        let req = self.inner.build()?;
+    /// `None` is returned if the RequestBuilder can not be cloned,
-        self.client.execute_with_extensions(req, ext).await
+    /// i.e. if the request body is a stream.
-    }
+    ///
-
+    /// # Extensions
-    pub fn try_clone(self) -> Option<Self> {
+    /// Note that extensions are not preserved through cloning.
-        let client = self.client;
+    pub fn try_clone(&self) -> Option<Self> {
-        self.inner
+        self.inner.try_clone().map(|inner| RequestBuilder {
-            .try_clone()
+            inner,
-            .map(|inner| RequestBuilder { inner, client })
+            client: self.client.clone(),
+            extensions: Extensions::new(),
+        })
+    }
+}
+
+impl fmt::Debug for RequestBuilder {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        // skipping middleware_stack field for now
+        f.debug_struct("RequestBuilder")
+            .field("inner", &self.inner)
+            .finish_non_exhaustive()
     }
 }

reqwest-middleware/src/error.rs

@@ -1,3 +1,4 @@
+use reqwest::{StatusCode, Url};
 use thiserror::Error;
 
 pub type Result<T> = std::result::Result<T, Error>;
@@ -19,4 +20,122 @@ impl Error {
     {
         Error::Middleware(err.into())
     }
+
+    /// Returns a possible URL related to this error.
+    pub fn url(&self) -> Option<&Url> {
+        match self {
+            Error::Middleware(_) => None,
+            Error::Reqwest(e) => e.url(),
+        }
+    }
+
+    /// Returns a mutable reference to the URL related to this error.
+    ///
+    /// This is useful if you need to remove sensitive information from the URL
+    /// (e.g. an API key in the query), but do not want to remove the URL
+    /// entirely.
+    pub fn url_mut(&mut self) -> Option<&mut Url> {
+        match self {
+            Error::Middleware(_) => None,
+            Error::Reqwest(e) => e.url_mut(),
+        }
+    }
+
+    /// Adds a url related to this error (overwriting any existing).
+    pub fn with_url(self, url: Url) -> Self {
+        match self {
+            Error::Middleware(_) => self,
+            Error::Reqwest(e) => e.with_url(url).into(),
+        }
+    }
+
+    /// Strips the related URL from this error (if, for example, it contains
+    /// sensitive information).
+    pub fn without_url(self) -> Self {
+        match self {
+            Error::Middleware(_) => self,
+            Error::Reqwest(e) => e.without_url().into(),
+        }
+    }
+
+    /// Returns true if the error is from any middleware.
+    pub fn is_middleware(&self) -> bool {
+        match self {
+            Error::Middleware(_) => true,
+            Error::Reqwest(_) => false,
+        }
+    }
+
+    /// Returns true if the error is from a type `Builder`.
+    pub fn is_builder(&self) -> bool {
+        match self {
+            Error::Middleware(_) => false,
+            Error::Reqwest(e) => e.is_builder(),
+        }
+    }
+
+    /// Returns true if the error is from a `RedirectPolicy`.
+    pub fn is_redirect(&self) -> bool {
+        match self {
+            Error::Middleware(_) => false,
+            Error::Reqwest(e) => e.is_redirect(),
+        }
+    }
+
+    /// Returns true if the error is from `Response::error_for_status`.
+    pub fn is_status(&self) -> bool {
+        match self {
+            Error::Middleware(_) => false,
+            Error::Reqwest(e) => e.is_status(),
+        }
+    }
+
+    /// Returns true if the error is related to a timeout.
+    pub fn is_timeout(&self) -> bool {
+        match self {
+            Error::Middleware(_) => false,
+            Error::Reqwest(e) => e.is_timeout(),
+        }
+    }
+
+    /// Returns true if the error is related to the request.
+    pub fn is_request(&self) -> bool {
+        match self {
+            Error::Middleware(_) => false,
+            Error::Reqwest(e) => e.is_request(),
+        }
+    }
+
+    #[cfg(not(target_arch = "wasm32"))]
+    /// Returns true if the error is related to connect.
+    pub fn is_connect(&self) -> bool {
+        match self {
+            Error::Middleware(_) => false,
+            Error::Reqwest(e) => e.is_connect(),
+        }
+    }
+
+    /// Returns true if the error is related to the request or response body.
+    pub fn is_body(&self) -> bool {
+        match self {
+            Error::Middleware(_) => false,
+            Error::Reqwest(e) => e.is_body(),
+        }
+    }
+
+    /// Returns true if the error is related to decoding the response's body.
+    pub fn is_decode(&self) -> bool {
+        match self {
+            Error::Middleware(_) => false,
+            Error::Reqwest(e) => e.is_decode(),
+        }
+    }
+
+    /// Returns the status code, if the error was generated from a response.
+    pub fn status(&self) -> Option<StatusCode> {
+        match self {
+            Error::Middleware(_) => None,
+            Error::Reqwest(e) => e.status(),
+        }
+    }
 }

reqwest-middleware/src/lib.rs

@@ -52,7 +52,9 @@ pub struct ReadmeDoctests;
 mod client;
 mod error;
 mod middleware;
+mod req_init;
 
 pub use client::{ClientBuilder, ClientWithMiddleware, RequestBuilder};
 pub use error::{Error, Result};
 pub use middleware::{Middleware, Next};
+pub use req_init::{Extension, RequestInitialiser};

reqwest-middleware/src/middleware.rs

@@ -1,4 +1,3 @@
-use futures::future::{BoxFuture, FutureExt, TryFutureExt};
 use reqwest::{Client, Request, Response};
 use std::sync::Arc;
 use task_local_extensions::Extensions;
@@ -32,7 +31,8 @@ use crate::error::{Error, Result};
 ///
 /// [`ClientWithMiddleware`]: crate::ClientWithMiddleware
 /// [`with`]: crate::ClientBuilder::with
-#[async_trait::async_trait]
+#[cfg_attr(not(target_arch = "wasm32"), async_trait::async_trait)]
+#[cfg_attr(target_arch = "wasm32", async_trait::async_trait(?Send))]
 pub trait Middleware: 'static + Send + Sync {
     /// Invoked with a request before sending it. If you want to continue processing the request,
     /// you should explicitly call `next.run(req, extensions)`.
@@ -47,7 +47,14 @@ pub trait Middleware: 'static + Send + Sync {
     ) -> Result<Response>;
 }
 
-#[async_trait::async_trait]
+impl std::fmt::Debug for dyn Middleware {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "Middleware")
+    }
+}
+
+#[cfg_attr(not(target_arch = "wasm32"), async_trait::async_trait)]
+#[cfg_attr(target_arch = "wasm32", async_trait::async_trait(?Send))]
 impl<F> Middleware for F
 where
     F: Send
@@ -76,6 +83,11 @@ pub struct Next<'a> {
     middlewares: &'a [Arc<dyn Middleware>],
 }
 
+#[cfg(not(target_arch = "wasm32"))]
+pub type BoxFuture<'a, T> = std::pin::Pin<Box<dyn std::future::Future<Output = T> + Send + 'a>>;
+#[cfg(target_arch = "wasm32")]
+pub type BoxFuture<'a, T> = std::pin::Pin<Box<dyn std::future::Future<Output = T> + 'a>>;
+
 impl<'a> Next<'a> {
     pub(crate) fn new(client: &'a Client, middlewares: &'a [Arc<dyn Middleware>]) -> Self {
         Next {
@@ -91,9 +103,9 @@ impl<'a> Next<'a> {
     ) -> BoxFuture<'a, Result<Response>> {
         if let Some((current, rest)) = self.middlewares.split_first() {
             self.middlewares = rest;
-            current.handle(req, extensions, self).boxed()
+            Box::pin(current.handle(req, extensions, self))
         } else {
-            self.client.execute(req).map_err(Error::from).boxed()
+            Box::pin(async move { self.client.execute(req).await.map_err(Error::from) })
         }
     }
 }

reqwest-middleware/src/req_init.rs

@@ -0,0 +1,90 @@
+use crate::RequestBuilder;
+
+/// When attached to a [`ClientWithMiddleware`] (generally using [`with_init`]), it is run
+/// whenever the client starts building a request, in the order it was attached.
+///
+/// # Example
+///
+/// ```
+/// use reqwest_middleware::{RequestInitialiser, RequestBuilder};
+///
+/// struct AuthInit;
+///
+/// impl RequestInitialiser for AuthInit {
+///     fn init(&self, req: RequestBuilder) -> RequestBuilder {
+///         req.bearer_auth("my_auth_token")
+///     }
+/// }
+/// ```
+///
+/// [`ClientWithMiddleware`]: crate::ClientWithMiddleware
+/// [`with_init`]: crate::ClientBuilder::with_init
+pub trait RequestInitialiser: 'static + Send + Sync {
+    fn init(&self, req: RequestBuilder) -> RequestBuilder;
+}
+
+impl core::fmt::Debug for dyn RequestInitialiser {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "RequestInitialiser")
+    }
+}
+
+impl<F> RequestInitialiser for F
+where
+    F: Send + Sync + 'static + Fn(RequestBuilder) -> RequestBuilder,
+{
+    fn init(&self, req: RequestBuilder) -> RequestBuilder {
+        (self)(req)
+    }
+}
+
+/// A middleware that inserts the value into the [`Extensions`](task_local_extensions::Extensions) during the call.
+///
+/// This is a good way to inject extensions to middleware deeper in the stack
+///
+/// ```
+/// use reqwest::{Client, Request, Response};
+/// use reqwest_middleware::{ClientBuilder, Middleware, Next, Result, Extension};
+/// use task_local_extensions::Extensions;
+///
+/// #[derive(Clone)]
+/// struct LogName(&'static str);
+/// struct LoggingMiddleware;
+///
+/// #[async_trait::async_trait]
+/// impl Middleware for LoggingMiddleware {
+///     async fn handle(
+///         &self,
+///         req: Request,
+///         extensions: &mut Extensions,
+///         next: Next<'_>,
+///     ) -> Result<Response> {
+///         // get the log name or default to "unknown"
+///         let name = extensions
+///             .get()
+///             .map(|&LogName(name)| name)
+///             .unwrap_or("unknown");
+///         println!("[{name}] Request started {req:?}");
+///         let res = next.run(req, extensions).await;
+///         println!("[{name}] Result: {res:?}");
+///         res
+///     }
+/// }
+///
+/// async fn run() {
+///     let reqwest_client = Client::builder().build().unwrap();
+///     let client = ClientBuilder::new(reqwest_client)
+///         .with_init(Extension(LogName("my-client")))
+///         .with(LoggingMiddleware)
+///         .build();
+///     let resp = client.get("https://truelayer.com").send().await.unwrap();
+///     println!("TrueLayer page HTML: {}", resp.text().await.unwrap());
+/// }
+/// ```
+pub struct Extension<T>(pub T);
+
+impl<T: Send + Sync + Clone + 'static> RequestInitialiser for Extension<T> {
+    fn init(&self, req: RequestBuilder) -> RequestBuilder {
+        req.with_extension(self.0.clone())
+    }
+}

reqwest-retry/CHANGELOG.md

@@ -4,7 +4,30 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.3.0] - 2023-09-07
+### Changed
+- `retry-policies` upgraded to 0.2.0
+
+## [0.2.3] - 2023-08-30
+### Added
+- `RetryableStrategy` which allows for custom retry decisions based on the response that a request got
+
+## [0.2.1] - 2022-12-01
+
+### Changed
+- Classify `io::Error`s and `hyper::Error(Canceled)` as transient
+
+## [0.2.0] - 2022-11-15
+### Changed
+- Updated `reqwest-middleware` to `0.2.0`
+
+## [0.1.4] - 2022-02-21
+### Changed
+- Updated `reqwest-middleware` to `0.1.5`
+
+## [0.1.3] - 2022-01-24
+### Changed
+- Updated `reqwest-middleware` to `0.1.4`
 
 ## [0.1.2] - 2021-09-28
 ### Added

reqwest-retry/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "reqwest-retry"
-version = "0.1.4-alpha.0"
+version = "0.3.0"
 authors = ["Rodrigo Gryzinski <rodrigo.gryzinski@truelayer.com>"]
 edition = "2018"
 description = "Retry middleware for reqwest."
@@ -10,22 +10,29 @@ keywords = ["reqwest", "http", "middleware", "retry"]
 categories = ["web-programming::http-client"]
 
 [dependencies]
-reqwest-middleware = { version = "0.1.2", path = "../reqwest-middleware" }
+reqwest-middleware = { version = "0.2.0", path = "../reqwest-middleware" }
 
-anyhow = "1"
+anyhow = "1.0.0"
 async-trait = "0.1.51"
 chrono = { version = "0.4.19", features = ["clock"], default-features = false }
-futures = "0.3"
+futures = "0.3.0"
-http = "0.2"
+http = "0.2.0"
-hyper = "0.14"
+reqwest = { version = "0.11.0", default-features = false }
-retry-policies = "0.1"
+retry-policies = "0.2.0"
-reqwest = { version = "0.11", default-features = false }
+task-local-extensions = "0.1.4"
-tokio = { version = "1.6", features = ["time"] }
 tracing = "0.1.26"
-task-local-extensions = "0.1.1"
+
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+hyper = "0.14.0"
+tokio = { version = "1.6.0", features = ["time"] }
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+parking_lot = { version = "0.11.2", features = ["wasm-bindgen"] } # work around https://github.com/tomaka/wasm-timer/issues/14
+wasm-timer = "0.2.5"
+getrandom = { version = "0.2.0", features = ["js"] }
 
 [dev-dependencies]
-wiremock = "0.5"
+paste = "1.0.0"
-tokio = { version = "1", features = ["macros"] }
+tokio = { version = "1.0.0", features = ["full"] }
-paste = "1"
+wiremock = "0.5.0"
-async-std = { version = "1.10"}
+futures = "0.3.0"

reqwest-retry/src/lib.rs

@@ -27,8 +27,13 @@
 
 mod middleware;
 mod retryable;
+mod retryable_strategy;
 
 pub use retry_policies::{policies, RetryPolicy};
 
 pub use middleware::RetryTransientMiddleware;
 pub use retryable::Retryable;
+pub use retryable_strategy::{
+    default_on_request_failure, default_on_request_success, DefaultRetryableStrategy,
+    RetryableStrategy,
+};

reqwest-retry/src/middleware.rs

@@ -1,6 +1,6 @@
 //! `RetryTransientMiddleware` implements retrying requests on transient errors.
-
+use crate::retryable_strategy::RetryableStrategy;
-use crate::retryable::Retryable;
+use crate::{retryable::Retryable, retryable_strategy::DefaultRetryableStrategy};
 use anyhow::anyhow;
 use chrono::Utc;
 use reqwest::{Request, Response};
@@ -8,14 +8,13 @@ use reqwest_middleware::{Error, Middleware, Next, Result};
 use retry_policies::RetryPolicy;
 use task_local_extensions::Extensions;
 
-/// We limit the number of retries to a maximum of `10` to avoid stack-overflow issues due to the recursion.
-static MAXIMUM_NUMBER_OF_RETRIES: u32 = 10;
-
 /// `RetryTransientMiddleware` offers retry logic for requests that fail in a transient manner
 /// and can be safely executed again.
 ///
-/// Currently, it allows setting a [RetryPolicy][retry_policies::RetryPolicy] algorithm for calculating the __wait_time__
+/// Currently, it allows setting a [RetryPolicy] algorithm for calculating the __wait_time__
-/// between each request retry.
+/// between each request retry. Sleeping on non-`wasm32` archs is performed using
+/// [`tokio::time::sleep`], therefore it will respect pauses/auto-advance if run under a
+/// runtime that supports them.
 ///
 ///```rust
 ///     use reqwest_middleware::ClientBuilder;
@@ -35,19 +34,54 @@ static MAXIMUM_NUMBER_OF_RETRIES: u32 = 10;
 ///     let client = ClientBuilder::new(Client::new()).with(retry_transient_middleware).build();
 ///```
 ///
-pub struct RetryTransientMiddleware<T: RetryPolicy + Send + Sync + 'static> {
+/// # Note
+///
+/// This middleware always errors when given requests with streaming bodies, before even executing
+/// the request. When this happens you'll get an [`Error::Middleware`] with the message
+/// 'Request object is not clonable. Are you passing a streaming body?'.
+///
+/// Some workaround suggestions:
+/// * If you can fit the data in memory, you can instead build static request bodies e.g. with
+/// `Body`'s `From<String>` or `From<Bytes>` implementations.
+/// * You can wrap this middleware in a custom one which skips retries for streaming requests.
+/// * You can write a custom retry middleware that builds new streaming requests from the data
+/// source directly, avoiding the issue of streaming requests not being clonable.
+pub struct RetryTransientMiddleware<
+    T: RetryPolicy + Send + Sync + 'static,
+    R: RetryableStrategy + Send + Sync + 'static = DefaultRetryableStrategy,
+> {
     retry_policy: T,
+    retryable_strategy: R,
 }
 
-impl<T: RetryPolicy + Send + Sync> RetryTransientMiddleware<T> {
+impl<T: RetryPolicy + Send + Sync> RetryTransientMiddleware<T, DefaultRetryableStrategy> {
-    /// Construct `RetryTransientMiddleware` with  a [retry_policy][retry_policies::RetryPolicy].
+    /// Construct `RetryTransientMiddleware` with  a [retry_policy][RetryPolicy].
     pub fn new_with_policy(retry_policy: T) -> Self {
-        Self { retry_policy }
+        Self::new_with_policy_and_strategy(retry_policy, DefaultRetryableStrategy)
     }
 }
 
-#[async_trait::async_trait]
+impl<T, R> RetryTransientMiddleware<T, R>
-impl<T: RetryPolicy + Send + Sync> Middleware for RetryTransientMiddleware<T> {
+where
+    T: RetryPolicy + Send + Sync,
+    R: RetryableStrategy + Send + Sync,
+{
+    /// Construct `RetryTransientMiddleware` with  a [retry_policy][RetryPolicy] and [retryable_strategy](RetryableStrategy).
+    pub fn new_with_policy_and_strategy(retry_policy: T, retryable_strategy: R) -> Self {
+        Self {
+            retry_policy,
+            retryable_strategy,
+        }
+    }
+}
+
+#[cfg_attr(not(target_arch = "wasm32"), async_trait::async_trait)]
+#[cfg_attr(target_arch = "wasm32", async_trait::async_trait(?Send))]
+impl<T, R> Middleware for RetryTransientMiddleware<T, R>
+where
+    T: RetryPolicy + Send + Sync,
+    R: RetryableStrategy + Send + Sync + 'static,
+{
     async fn handle(
         &self,
         req: Request,
@@ -58,33 +92,26 @@ impl<T: RetryPolicy + Send + Sync> Middleware for RetryTransientMiddleware<T> {
         // downstream. This will guard against previous retries poluting `Extensions`.
         // That is, we only return what's populated in the typemap for the last retry attempt
         // and copy those into the the `global` Extensions map.
-        self.execute_with_retry_recursive(req, next, extensions, 0)
+        self.execute_with_retry(req, next, extensions).await
-            .await
     }
 }
 
-impl<T: RetryPolicy + Send + Sync> RetryTransientMiddleware<T> {
+impl<T, R> RetryTransientMiddleware<T, R>
-    /// **RECURSIVE**.
+where
-    ///
+    T: RetryPolicy + Send + Sync,
-    /// SAFETY: The condition for termination is the number of retries
+    R: RetryableStrategy + Send + Sync,
-    /// set on the `RetryOption` object which is capped to 10 therefore
+{
-    /// we can know that this will not cause a overflow of the stack.
-    ///
     /// This function will try to execute the request, if it fails
     /// with an error classified as transient it will call itself
     /// to retry the request.
-    ///
+    async fn execute_with_retry<'a>(
-    /// NOTE: This function is not async because calling an async function
-    /// recursively is not allowed.
-    ///
-    fn execute_with_retry_recursive<'a>(
         &'a self,
         req: Request,
         next: Next<'a>,
-        mut ext: &'a mut Extensions,
+        ext: &'a mut Extensions,
-        n_past_retries: u32,
+    ) -> Result<Response> {
-    ) -> futures::future::BoxFuture<'a, Result<Response>> {
+        let mut n_past_retries = 0;
-        Box::pin(async move {
+        loop {
             // Cloning the request object before-the-fact is not ideal..
             // However, if the body of the request is not static, e.g of type `Bytes`,
             // the Clone operation should be of constant complexity and not O(N)
@@ -95,21 +122,16 @@ impl<T: RetryPolicy + Send + Sync> RetryTransientMiddleware<T> {
                 ))
             })?;
 
-            let cloned_next = next.clone();
+            let result = next.clone().run(duplicate_request, ext).await;
-
-            let result = next.run(req, &mut ext).await;
 
             // We classify the response which will return None if not
             // errors were returned.
-            match Retryable::from_reqwest_response(&result) {
+            break match self.retryable_strategy.handle(&result) {
-                Some(retryable)
+                Some(Retryable::Transient) => {
-                    if retryable == Retryable::Transient
-                        && n_past_retries < MAXIMUM_NUMBER_OF_RETRIES =>
-                {
                     // If the response failed and the error type was transient
                     // we can safely try to retry the request.
-                    let retry_decicion = self.retry_policy.should_retry(n_past_retries);
+                    let retry_decision = self.retry_policy.should_retry(n_past_retries);
-                    if let retry_policies::RetryDecision::Retry { execute_after } = retry_decicion {
+                    if let retry_policies::RetryDecision::Retry { execute_after } = retry_decision {
                         let duration = (execute_after - Utc::now())
                             .to_std()
                             .map_err(Error::middleware)?;
@@ -119,21 +141,21 @@ impl<T: RetryPolicy + Send + Sync> RetryTransientMiddleware<T> {
                             n_past_retries,
                             duration
                         );
+                        #[cfg(not(target_arch = "wasm32"))]
                         tokio::time::sleep(duration).await;
+                        #[cfg(target_arch = "wasm32")]
+                        wasm_timer::Delay::new(duration)
+                            .await
+                            .expect("failed sleeping");
 
-                        self.execute_with_retry_recursive(
+                        n_past_retries += 1;
-                            duplicate_request,
+                        continue;
-                            cloned_next,
-                            ext,
-                            n_past_retries + 1,
-                        )
-                        .await
                     } else {
                         result
                     }
                 }
                 Some(_) | None => result,
-            }
+            };
-        })
+        }
     }
 }

reqwest-retry/src/retryable.rs

@@ -1,4 +1,4 @@
-use http::StatusCode;
+use crate::retryable_strategy::{DefaultRetryableStrategy, RetryableStrategy};
 use reqwest_middleware::Error;
 
 /// Classification of an error/status returned by request.
@@ -16,62 +16,7 @@ impl Retryable {
     /// Returns `None` if the response object does not contain any errors.
     ///
     pub fn from_reqwest_response(res: &Result<reqwest::Response, Error>) -> Option<Self> {
-        match res {
+        DefaultRetryableStrategy.handle(res)
-            Ok(success) => {
-                let status = success.status();
-                if status.is_server_error() {
-                    Some(Retryable::Transient)
-                } else if status.is_client_error()
-                    && status != StatusCode::REQUEST_TIMEOUT
-                    && status != StatusCode::TOO_MANY_REQUESTS
-                {
-                    Some(Retryable::Fatal)
-                } else if status.is_success() {
-                    None
-                } else if status == StatusCode::REQUEST_TIMEOUT
-                    || status == StatusCode::TOO_MANY_REQUESTS
-                {
-                    Some(Retryable::Transient)
-                } else {
-                    Some(Retryable::Fatal)
-                }
-            }
-            Err(error) => match error {
-                // If something fails in the middleware we're screwed.
-                Error::Middleware(_) => Some(Retryable::Fatal),
-                Error::Reqwest(error) => {
-                    if error.is_timeout() || error.is_connect() {
-                        Some(Retryable::Transient)
-                    } else if error.is_body()
-                        || error.is_decode()
-                        || error.is_builder()
-                        || error.is_redirect()
-                    {
-                        Some(Retryable::Fatal)
-                    } else if error.is_request() {
-                        // It seems that hyper::Error(IncompleteMessage) is not correctly handled by reqwest.
-                        // Here we check if the Reqwest error was originated by hyper and map it consistently.
-                        if let Some(hyper_error) = get_source_error_type::<hyper::Error>(&error) {
-                            // The hyper::Error(IncompleteMessage) is raised if the HTTP response is well formatted but does not contain all the bytes.
-                            // This can happen when the server has started sending back the response but the connection is cut halfway thorugh.
-                            // We can safely retry the call, hence marking this error as [`Retryable::Transient`].
-                            if hyper_error.is_incomplete_message() {
-                                Some(Retryable::Transient)
-                            } else {
-                                Some(Retryable::Fatal)
-                            }
-                        } else {
-                            Some(Retryable::Fatal)
-                        }
-                    } else {
-                        // We omit checking if error.is_status() since we check that already.
-                        // However, if Response::error_for_status is used the status will still
-                        // remain in the response object.
-                        None
-                    }
-                }
-            },
-        }
     }
 }
 
@@ -80,19 +25,3 @@ impl From<&reqwest::Error> for Retryable {
         Retryable::Transient
     }
 }
-
-/// Downcasts the given err source into T.
-fn get_source_error_type<T: std::error::Error + 'static>(
-    err: &dyn std::error::Error,
-) -> Option<&T> {
-    let mut source = err.source();
-
-    while let Some(err) = source {
-        if let Some(hyper_err) = err.downcast_ref::<T>() {
-            return Some(hyper_err);
-        }
-
-        source = err.source();
-    }
-    None
-}

reqwest-retry/src/retryable_strategy.rs

@@ -0,0 +1,213 @@
+use crate::retryable::Retryable;
+use http::StatusCode;
+use reqwest_middleware::Error;
+
+/// A strategy to create a [`Retryable`] from a [`Result<reqwest::Response, reqwest_middleware::Error>`]
+///
+/// A [`RetryableStrategy`] has a single `handler` functions.
+/// The result of calling the request could be:
+/// - [`reqwest::Response`] In case the request has been sent and received correctly
+///     This could however still mean that the server responded with a erroneous response.
+///     For example a HTTP statuscode of 500
+/// - [`reqwest_middleware::Error`] In this case the request actually failed.
+///     This could, for example, be caused by a timeout on the connection.
+///
+/// Example:
+///
+/// ```
+/// use reqwest_retry::{default_on_request_failure, policies::ExponentialBackoff, Retryable, RetryableStrategy, RetryTransientMiddleware};
+/// use reqwest::{Request, Response};
+/// use reqwest_middleware::{ClientBuilder, Middleware, Next, Result};
+/// use task_local_extensions::Extensions;
+///
+/// // Log each request to show that the requests will be retried
+/// struct LoggingMiddleware;
+///
+/// #[async_trait::async_trait]
+/// impl Middleware for LoggingMiddleware {
+///     async fn handle(
+///         &self,
+///         req: Request,
+///         extensions: &mut Extensions,
+///         next: Next<'_>,
+///     ) -> Result<Response> {
+///         println!("Request started {}", req.url());
+///         let res = next.run(req, extensions).await;
+///         println!("Request finished");
+///         res
+///     }
+/// }
+///
+/// // Just a toy example, retry when the successful response code is 201, else do nothing.
+/// struct Retry201;
+/// impl RetryableStrategy for Retry201 {
+///     fn handle(&self, res: &Result<reqwest::Response>) -> Option<Retryable> {
+///          match res {
+///              // retry if 201
+///              Ok(success) if success.status() == 201 => Some(Retryable::Transient),
+///              // otherwise do not retry a successful request
+///              Ok(success) => None,
+///              // but maybe retry a request failure
+///              Err(error) => default_on_request_failure(error),
+///         }
+///     }
+/// }
+///
+/// #[tokio::main]
+/// async fn main() {
+///     // Exponential backoff with max 2 retries
+///     let retry_policy = ExponentialBackoff::builder()
+///         .build_with_max_retries(2);
+///     
+///     // Create the actual middleware, with the exponential backoff and custom retry stategy.
+///     let ret_s = RetryTransientMiddleware::new_with_policy_and_strategy(
+///         retry_policy,
+///         Retry201,
+///     );
+///
+///     let client = ClientBuilder::new(reqwest::Client::new())
+///         // Retry failed requests.
+///         .with(ret_s)
+///         // Log the requests
+///         .with(LoggingMiddleware)
+///         .build();
+///
+///     // Send request which should get a 201 response. So it will be retried
+///     let r = client   
+///         .get("https://httpbin.org/status/201")
+///         .send()
+///         .await;
+///     println!("{:?}", r);
+///
+///     // Send request which should get a 200 response. So it will not be retried
+///     let r = client   
+///         .get("https://httpbin.org/status/200")
+///         .send()
+///         .await;
+///     println!("{:?}", r);
+/// }
+/// ```
+pub trait RetryableStrategy {
+    fn handle(&self, res: &Result<reqwest::Response, Error>) -> Option<Retryable>;
+}
+
+/// The default [`RetryableStrategy`] for [`RetryTransientMiddleware`](crate::RetryTransientMiddleware).
+pub struct DefaultRetryableStrategy;
+
+impl RetryableStrategy for DefaultRetryableStrategy {
+    fn handle(&self, res: &Result<reqwest::Response, Error>) -> Option<Retryable> {
+        match res {
+            Ok(success) => default_on_request_success(success),
+            Err(error) => default_on_request_failure(error),
+        }
+    }
+}
+
+/// Default request success retry strategy.
+///
+/// Will only retry if:
+/// * The status was 5XX (server error)
+/// * The status was 408 (request timeout) or 429 (too many requests)
+///
+/// Note that success here means that the request finished without interruption, not that it was logically OK.
+pub fn default_on_request_success(success: &reqwest::Response) -> Option<Retryable> {
+    let status = success.status();
+    if status.is_server_error() {
+        Some(Retryable::Transient)
+    } else if status.is_client_error()
+        && status != StatusCode::REQUEST_TIMEOUT
+        && status != StatusCode::TOO_MANY_REQUESTS
+    {
+        Some(Retryable::Fatal)
+    } else if status.is_success() {
+        None
+    } else if status == StatusCode::REQUEST_TIMEOUT || status == StatusCode::TOO_MANY_REQUESTS {
+        Some(Retryable::Transient)
+    } else {
+        Some(Retryable::Fatal)
+    }
+}
+
+/// Default request failure retry strategy.
+///
+/// Will only retry if the request failed due to a network error
+pub fn default_on_request_failure(error: &Error) -> Option<Retryable> {
+    match error {
+        // If something fails in the middleware we're screwed.
+        Error::Middleware(_) => Some(Retryable::Fatal),
+        Error::Reqwest(error) => {
+            #[cfg(not(target_arch = "wasm32"))]
+            let is_connect = error.is_connect();
+            #[cfg(target_arch = "wasm32")]
+            let is_connect = false;
+            if error.is_timeout() || is_connect {
+                Some(Retryable::Transient)
+            } else if error.is_body()
+                || error.is_decode()
+                || error.is_builder()
+                || error.is_redirect()
+            {
+                Some(Retryable::Fatal)
+            } else if error.is_request() {
+                // It seems that hyper::Error(IncompleteMessage) is not correctly handled by reqwest.
+                // Here we check if the Reqwest error was originated by hyper and map it consistently.
+                #[cfg(not(target_arch = "wasm32"))]
+                if let Some(hyper_error) = get_source_error_type::<hyper::Error>(&error) {
+                    // The hyper::Error(IncompleteMessage) is raised if the HTTP response is well formatted but does not contain all the bytes.
+                    // This can happen when the server has started sending back the response but the connection is cut halfway thorugh.
+                    // We can safely retry the call, hence marking this error as [`Retryable::Transient`].
+                    // Instead hyper::Error(Canceled) is raised when the connection is
+                    // gracefully closed on the server side.
+                    if hyper_error.is_incomplete_message() || hyper_error.is_canceled() {
+                        Some(Retryable::Transient)
+
+                    // Try and downcast the hyper error to io::Error if that is the
+                    // underlying error, and try and classify it.
+                    } else if let Some(io_error) =
+                        get_source_error_type::<std::io::Error>(hyper_error)
+                    {
+                        Some(classify_io_error(io_error))
+                    } else {
+                        Some(Retryable::Fatal)
+                    }
+                } else {
+                    Some(Retryable::Fatal)
+                }
+                #[cfg(target_arch = "wasm32")]
+                Some(Retryable::Fatal)
+            } else {
+                // We omit checking if error.is_status() since we check that already.
+                // However, if Response::error_for_status is used the status will still
+                // remain in the response object.
+                None
+            }
+        }
+    }
+}
+
+#[cfg(not(target_arch = "wasm32"))]
+fn classify_io_error(error: &std::io::Error) -> Retryable {
+    match error.kind() {
+        std::io::ErrorKind::ConnectionReset | std::io::ErrorKind::ConnectionAborted => {
+            Retryable::Transient
+        }
+        _ => Retryable::Fatal,
+    }
+}
+
+/// Downcasts the given err source into T.
+#[cfg(not(target_arch = "wasm32"))]
+fn get_source_error_type<T: std::error::Error + 'static>(
+    err: &dyn std::error::Error,
+) -> Option<&T> {
+    let mut source = err.source();
+
+    while let Some(err) = source {
+        if let Some(err) = err.downcast_ref::<T>() {
+            return Some(err);
+        }
+
+        source = err.source();
+    }
+    None
+}

reqwest-retry/tests/all/helpers/simple_server.rs

@@ -1,9 +1,12 @@
-use async_std::io::ReadExt;
+use futures::future::BoxFuture;
-use async_std::io::WriteExt;
-use async_std::net::{TcpListener, TcpStream};
-use futures::stream::StreamExt;
 use std::error::Error;
 use std::fmt;
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use tokio::net::{TcpListener, TcpStream};
+
+type CustomMessageHandler = Box<
+    dyn Fn(TcpStream) -> BoxFuture<'static, Result<(), Box<dyn std::error::Error>>> + Send + Sync,
+>;
 
 /// This is a simple server that returns the responses given at creation time: [`self.raw_http_responses`] following a round-robin mechanism.
 pub struct SimpleServer {
@@ -12,6 +15,7 @@ pub struct SimpleServer {
     host: String,
     raw_http_responses: Vec<String>,
     calls_counter: usize,
+    custom_handler: Option<CustomMessageHandler>,
 }
 
 /// Request-Line = Method SP Request-URI SP HTTP-Version CRLF
@@ -46,9 +50,21 @@ impl SimpleServer {
             host: host.to_string(),
             raw_http_responses,
             calls_counter: 0,
+            custom_handler: None,
         })
     }
 
+    pub fn set_custom_handler(
+        &mut self,
+        custom_handler: impl Fn(TcpStream) -> BoxFuture<'static, Result<(), Box<dyn std::error::Error>>>
+            + Send
+            + Sync
+            + 'static,
+    ) -> &mut Self {
+        self.custom_handler.replace(Box::new(custom_handler));
+        self
+    }
+
     /// Returns the uri in which the server is listening to.
     pub fn uri(&self) -> String {
         format!("http://{}:{}", self.host, self.port)
@@ -56,9 +72,9 @@ impl SimpleServer {
 
     /// Starts the TcpListener and handles the requests.
     pub async fn start(mut self) {
-        while let Some(stream) = self.listener.incoming().next().await {
+        loop {
-            match stream {
+            match self.listener.accept().await {
-                Ok(stream) => {
+                Ok((stream, _)) => {
                     match self.handle_connection(stream).await {
                         Ok(_) => (),
                         Err(e) => {
@@ -79,11 +95,15 @@ impl SimpleServer {
     ///
     /// Returns a 400 if the request if formatted badly.
     async fn handle_connection(&self, mut stream: TcpStream) -> Result<(), Box<dyn Error>> {
+        if let Some(ref custom_handler) = self.custom_handler {
+            return custom_handler(stream).await;
+        }
+
         let mut buffer = vec![0; 1024];
 
-        stream.read(&mut buffer).await.unwrap();
+        let n = stream.read(&mut buffer).await.unwrap();
 
-        let request = String::from_utf8_lossy(&buffer[..]);
+        let request = String::from_utf8_lossy(&buffer[..n]);
         let request_line = request.lines().next().unwrap();
 
         let response = match Self::parse_request_line(request_line) {
@@ -98,7 +118,7 @@ impl SimpleServer {
         };
 
         println!("-- Response --\n{}\n--------------", response.clone());
-        stream.write(response.as_bytes()).await.unwrap();
+        stream.write_all(response.as_bytes()).await.unwrap();
         stream.flush().await.unwrap();
 
         Ok(())

reqwest-retry/tests/all/retry.rs

@@ -1,12 +1,16 @@
+use futures::FutureExt;
 use paste::paste;
 use reqwest::Client;
 use reqwest::StatusCode;
 use reqwest_middleware::ClientBuilder;
 use reqwest_retry::{policies::ExponentialBackoff, RetryTransientMiddleware};
+use std::sync::atomic::AtomicI8;
 use std::sync::{
     atomic::{AtomicU32, Ordering},
     Arc,
 };
+use tokio::io::AsyncReadExt;
+use tokio::io::AsyncWriteExt;
 use wiremock::matchers::{method, path};
 use wiremock::{Mock, MockServer, Respond, ResponseTemplate};
 
@@ -49,12 +53,12 @@ macro_rules! assert_retry_succeeds_inner {
             let reqwest_client = Client::builder().build().unwrap();
             let client = ClientBuilder::new(reqwest_client)
                 .with(RetryTransientMiddleware::new_with_policy(
-                    ExponentialBackoff {
+                    ExponentialBackoff::builder()
-                        max_n_retries: retry_amount,
+                        .retry_bounds(
-                        max_retry_interval: std::time::Duration::from_millis(30),
+                            std::time::Duration::from_millis(30),
-                        min_retry_interval: std::time::Duration::from_millis(100),
+                            std::time::Duration::from_millis(100),
-                        backoff_exponent: 2,
+                        )
-                    },
+                        .build_with_max_retries(retry_amount),
                 ))
                 .build();
 
@@ -147,17 +151,6 @@ assert_retry_succeeds!(429, StatusCode::OK);
 assert_no_retry!(431, StatusCode::REQUEST_HEADER_FIELDS_TOO_LARGE);
 assert_no_retry!(451, StatusCode::UNAVAILABLE_FOR_LEGAL_REASONS);
 
-// We assert that we cap retries at 10, which means that we will
-// get 11 calls to the RetryResponder.
-assert_retry_succeeds_inner!(
-    500,
-    assert_maximum_retries_is_not_exceeded,
-    StatusCode::INTERNAL_SERVER_ERROR,
-    100,
-    11,
-    RetryResponder::new(100_u32, 500)
-);
-
 pub struct RetryTimeoutResponder(Arc<AtomicU32>, u32, std::time::Duration);
 
 impl RetryTimeoutResponder {
@@ -196,12 +189,12 @@ async fn assert_retry_on_request_timeout() {
     let reqwest_client = Client::builder().build().unwrap();
     let client = ClientBuilder::new(reqwest_client)
         .with(RetryTransientMiddleware::new_with_policy(
-            ExponentialBackoff {
+            ExponentialBackoff::builder()
-                max_n_retries: 3,
+                .retry_bounds(
-                max_retry_interval: std::time::Duration::from_millis(100),
+                    std::time::Duration::from_millis(30),
-                min_retry_interval: std::time::Duration::from_millis(30),
+                    std::time::Duration::from_millis(100),
-                backoff_exponent: 2,
+                )
-            },
+                .build_with_max_retries(3),
         ))
         .build();
 
@@ -251,12 +244,111 @@ async fn assert_retry_on_incomplete_message() {
     let reqwest_client = Client::builder().build().unwrap();
     let client = ClientBuilder::new(reqwest_client)
         .with(RetryTransientMiddleware::new_with_policy(
-            ExponentialBackoff {
+            ExponentialBackoff::builder()
-                max_n_retries: 3,
+                .retry_bounds(
-                max_retry_interval: std::time::Duration::from_millis(100),
+                    std::time::Duration::from_millis(30),
-                min_retry_interval: std::time::Duration::from_millis(30),
+                    std::time::Duration::from_millis(100),
-                backoff_exponent: 2,
+                )
-            },
+                .build_with_max_retries(3),
+        ))
+        .build();
+
+    let resp = client
+        .get(&format!("{}/foo", uri))
+        .timeout(std::time::Duration::from_millis(100))
+        .send()
+        .await
+        .expect("call failed");
+
+    assert_eq!(resp.status(), 200);
+}
+
+#[tokio::test]
+async fn assert_retry_on_hyper_canceled() {
+    let counter = Arc::new(AtomicI8::new(0));
+    let mut simple_server = SimpleServer::new("127.0.0.1", None, vec![])
+        .await
+        .expect("Error when creating a simple server");
+    simple_server.set_custom_handler(move |mut stream| {
+        let counter = counter.clone();
+        async move {
+            let mut buffer = Vec::new();
+            stream.read_buf(&mut buffer).await.unwrap();
+            if counter.fetch_add(1, Ordering::SeqCst) > 1 {
+                // This triggeres hyper:Error(Canceled).
+                let _res = stream
+                    .into_std()
+                    .unwrap()
+                    .shutdown(std::net::Shutdown::Both);
+            } else {
+                let _res = stream.write("HTTP/1.1 200 OK\r\n\r\n".as_bytes()).await;
+            }
+            Ok(())
+        }
+        .boxed()
+    });
+
+    let uri = simple_server.uri();
+
+    tokio::spawn(simple_server.start());
+
+    let reqwest_client = Client::builder().build().unwrap();
+    let client = ClientBuilder::new(reqwest_client)
+        .with(RetryTransientMiddleware::new_with_policy(
+            ExponentialBackoff::builder()
+                .retry_bounds(
+                    std::time::Duration::from_millis(30),
+                    std::time::Duration::from_millis(100),
+                )
+                .build_with_max_retries(3),
+        ))
+        .build();
+
+    let resp = client
+        .get(&format!("{}/foo", uri))
+        .timeout(std::time::Duration::from_millis(100))
+        .send()
+        .await
+        .expect("call failed");
+
+    assert_eq!(resp.status(), 200);
+}
+
+#[tokio::test]
+async fn assert_retry_on_connection_reset_by_peer() {
+    let counter = Arc::new(AtomicI8::new(0));
+    let mut simple_server = SimpleServer::new("127.0.0.1", None, vec![])
+        .await
+        .expect("Error when creating a simple server");
+    simple_server.set_custom_handler(move |mut stream| {
+        let counter = counter.clone();
+        async move {
+            let mut buffer = Vec::new();
+            stream.read_buf(&mut buffer).await.unwrap();
+            if counter.fetch_add(1, Ordering::SeqCst) > 1 {
+                // This triggeres hyper:Error(Io, io::Error(ConnectionReset)).
+                drop(stream);
+            } else {
+                let _res = stream.write("HTTP/1.1 200 OK\r\n\r\n".as_bytes()).await;
+            }
+            Ok(())
+        }
+        .boxed()
+    });
+
+    let uri = simple_server.uri();
+
+    tokio::spawn(simple_server.start());
+
+    let reqwest_client = Client::builder().build().unwrap();
+    let client = ClientBuilder::new(reqwest_client)
+        .with(RetryTransientMiddleware::new_with_policy(
+            ExponentialBackoff::builder()
+                .retry_bounds(
+                    std::time::Duration::from_millis(30),
+                    std::time::Duration::from_millis(100),
+                )
+                .build_with_max_retries(3),
         ))
         .build();
 

reqwest-tracing/CHANGELOG.md

@@ -6,6 +6,73 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.6] - 2023-08-23
+
+### Added
+- Add support for opentelemetry 0.20
+
+## [0.4.5] - 2023-06-20
+
+### Added
+- A new extension `DisableOtelPropagation` which stops opentelemetry contexts propagating
+- Support for opentelemetry 0.19
+
+## [0.4.4] - 2023-05-15
+
+### Added
+- A new `default_span_name` method for use in custom span backends.
+
+## [0.4.3] - 2023-05-15
+
+### Fixed
+- Fix span and http status codes
+
+## [0.4.2] - 2023-05-12
+
+### Added
+- `OtelPathNames` extension to provide known parameterized paths that will be used in span names
+
+### Changed
+- `DefaultSpanBackend` and `SpanBackendWithUrl` default span name to HTTP method name instead of `reqwest-http-client`
+
+## [0.4.1] - 2023-03-09
+
+### Added
+
+- Support for `wasm32-unknown-unknown` target
+
+## [0.4.0] - 2022-11-15
+
+### Changed
+- Updated `reqwest-middleware` to `0.2.0`
+- Before, `root_span!`/`DefaultSpanBacked` would name your spans `{METHOD} {PATH}`. Since this can be quite
+  high cardinality, this was changed and now the macro requires an explicit otel name.
+  `DefaultSpanBacked`/`SpanBackendWithUrl` will default to `reqwest-http-client` but this can be configured
+  using the `OtelName` Request Initialiser.
+
+### Added
+- `SpanBackendWithUrl` for capturing `http.url` in traces
+- `OtelName` Request Initialiser Extension for configuring
+
+## [0.3.1] - 2022-09-21
+- Added support for `opentelemetry` version `0.18`.
+
+## [0.3.0] - 2022-06-10
+### Breaking
+- Created `ReqwestOtelSpanBackend` trait with `reqwest_otel_span` macro to provide extendable default request otel fields
+
+## [0.2.3] - 2022-06-23
+### Fixed
+- Fix how we set the OpenTelemetry span status, based on the HTTP response status.
+
+## [0.2.2] - 2022-04-21
+### Fixed
+- Opentelemetry context is now propagated when the request span is disabled.
+
+## [0.2.1] - 2022-02-21
+### Changed
+- Updated `reqwest-middleware` to `0.1.5`
+
 ## [0.2.0] - 2021-11-30
 ### Breaking
 - Update to `tracing-subscriber` `0.3.x` when `opentelemetry_0_16` is active.

reqwest-tracing/Cargo.toml

@@ -1,12 +1,12 @@
 [package]
 name = "reqwest-tracing"
-version = "0.2.1-alpha.0"
+version = "0.4.7"
 authors = ["Rodrigo Gryzinski <rodrigo.gryzinski@truelayer.com>"]
 edition = "2018"
 description = "Opentracing middleware for reqwest."
 repository = "https://github.com/TrueLayer/reqwest-middleware"
 license = "MIT OR Apache-2.0"
-keywords = ["reqwest", "http", "middleware", "opentracing", "tracing"]
+keywords = ["reqwest", "http", "middleware", "opentelemetry", "tracing"]
 categories = ["web-programming::http-client"]
 
 [features]
@@ -14,25 +14,51 @@ opentelemetry_0_13 = ["opentelemetry_0_13_pkg", "tracing-opentelemetry_0_12_pkg"
 opentelemetry_0_14 = ["opentelemetry_0_14_pkg", "tracing-opentelemetry_0_13_pkg"]
 opentelemetry_0_15 = ["opentelemetry_0_15_pkg", "tracing-opentelemetry_0_14_pkg"]
 opentelemetry_0_16 = ["opentelemetry_0_16_pkg", "tracing-opentelemetry_0_16_pkg"]
+opentelemetry_0_17 = ["opentelemetry_0_17_pkg", "tracing-opentelemetry_0_17_pkg"]
+opentelemetry_0_18 = ["opentelemetry_0_18_pkg", "tracing-opentelemetry_0_18_pkg"]
+opentelemetry_0_19 = ["opentelemetry_0_19_pkg", "tracing-opentelemetry_0_19_pkg"]
+opentelemetry_0_20 = ["opentelemetry_0_20_pkg", "tracing-opentelemetry_0_20_pkg"]
+opentelemetry_0_21 = ["opentelemetry_0_21_pkg", "tracing-opentelemetry_0_22_pkg"]
+
 
 [dependencies]
-reqwest-middleware = { version = "0.1.2", path = "../reqwest-middleware" }
+reqwest-middleware = { version = "0.2.0", path = "../reqwest-middleware" }
 
+anyhow = "1.0.70"
 async-trait = "0.1.51"
-reqwest = { version = "0.11", default-features = false }
+matchit = "0.7.0"
-tokio = { version = "1.6", features = ["time"] }
+reqwest = { version = "0.11.0", default-features = false }
+task-local-extensions = "0.1.4"
 tracing = "0.1.26"
-task-local-extensions = "0.1.1"
 
-opentelemetry_0_13_pkg = { package = "opentelemetry", version = "0.13", optional = true }
+opentelemetry_0_13_pkg = { package = "opentelemetry", version = "0.13.0", optional = true }
-opentelemetry_0_14_pkg = { package = "opentelemetry", version = "0.14", optional = true }
+opentelemetry_0_14_pkg = { package = "opentelemetry", version = "0.14.0", optional = true }
-opentelemetry_0_15_pkg = { package = "opentelemetry", version = "0.15", optional = true }
+opentelemetry_0_15_pkg = { package = "opentelemetry", version = "0.15.0", optional = true }
-opentelemetry_0_16_pkg = { package = "opentelemetry", version = "0.16", optional = true }
+opentelemetry_0_16_pkg = { package = "opentelemetry", version = "0.16.0", optional = true }
-tracing-opentelemetry_0_12_pkg = { package = "tracing-opentelemetry",version = "0.12", optional = true }
+opentelemetry_0_17_pkg = { package = "opentelemetry", version = "0.17.0", optional = true }
-tracing-opentelemetry_0_13_pkg = { package = "tracing-opentelemetry", version = "0.13", optional = true }
+opentelemetry_0_18_pkg = { package = "opentelemetry", version = "0.18.0", optional = true }
-tracing-opentelemetry_0_14_pkg = { package = "tracing-opentelemetry",version = "0.14", optional = true }
+opentelemetry_0_19_pkg = { package = "opentelemetry", version = "0.19.0", optional = true }
-tracing-opentelemetry_0_16_pkg = { package = "tracing-opentelemetry",version = "0.16", optional = true }
+opentelemetry_0_20_pkg = { package = "opentelemetry", version = "0.20.0", optional = true }
+opentelemetry_0_21_pkg = { package = "opentelemetry", version = "0.21.0", optional = true }
+tracing-opentelemetry_0_12_pkg = { package = "tracing-opentelemetry", version = "0.12.0", optional = true }
+tracing-opentelemetry_0_13_pkg = { package = "tracing-opentelemetry", version = "0.13.0", optional = true }
+tracing-opentelemetry_0_14_pkg = { package = "tracing-opentelemetry", version = "0.14.0", optional = true }
+tracing-opentelemetry_0_16_pkg = { package = "tracing-opentelemetry", version = "0.16.0", optional = true }
+tracing-opentelemetry_0_17_pkg = { package = "tracing-opentelemetry", version = "0.17.0", optional = true }
+tracing-opentelemetry_0_18_pkg = { package = "tracing-opentelemetry", version = "0.18.0", optional = true }
+tracing-opentelemetry_0_19_pkg = { package = "tracing-opentelemetry", version = "0.19.0", optional = true }
+tracing-opentelemetry_0_20_pkg = { package = "tracing-opentelemetry", version = "0.20.0", optional = true }
+tracing-opentelemetry_0_22_pkg = { package = "tracing-opentelemetry", version = "0.22.0", optional = true }
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+getrandom = { version = "0.2.0", features = ["js"] }
 
 [dev-dependencies]
-wiremock = "0.5"
+tokio = { version = "1.0.0", features = ["macros"] }
-tokio = { version = "1", features = ["macros"] }
+tracing_subscriber_0_2 = { package = "tracing-subscriber", version = "0.2.0" }
+tracing_subscriber_0_3 = { package = "tracing-subscriber", version = "0.3.0" }
+wiremock = "0.5.0"
+
+opentelemetry_sdk_0_21 = { package = "opentelemetry_sdk", version = "0.21.0", features = ["trace"] }
+opentelemetry_stdout_0_1 = { package = "opentelemetry-stdout", version = "0.1.0", features = ["trace"] }
+opentelemetry_stdout_0_2 = { package = "opentelemetry-stdout", version = "0.2.0", features = ["trace"] }

reqwest-tracing/README.md

@@ -16,40 +16,60 @@ Attach `TracingMiddleware` to your client to automatically trace HTTP requests:
 # Cargo.toml
 # ...
 [dependencies]
-opentelemetry = "0.16"
+opentelemetry = "0.18"
 reqwest = "0.11"
 reqwest-middleware = "0.1.1"
 reqwest-retry = "0.1.1"
-reqwest-tracing = { version = "0.1.2", features = ["opentelemetry_0_16"] }
+reqwest-tracing = { version = "0.3.1", features = ["opentelemetry_0_18"] }
 tokio = { version = "1.12.0", features = ["macros", "rt-multi-thread"] }
 tracing = "0.1"
-tracing-opentelemetry = "0.15"
+tracing-opentelemetry = "0.18"
-tracing-subscriber = "0.2"
+tracing-subscriber = "0.3"
+task-local-extensions = "0.1.4"
 ```
 
 ```rust,skip
+use reqwest_tracing::{default_on_request_end, reqwest_otel_span, ReqwestOtelSpanBackend, TracingMiddleware};
 use opentelemetry::sdk::export::trace::stdout;
-use reqwest_middleware::ClientBuilder;
+use reqwest::{Request, Response};
-use reqwest_tracing::TracingMiddleware;
+use reqwest_middleware::{ClientBuilder, Result};
+use std::time::Instant;
+use task_local_extensions::Extensions;
+use tracing::Span;
 use tracing_subscriber::layer::SubscriberExt;
 use tracing_subscriber::Registry;
 
+pub struct TimeTrace;
+
+impl ReqwestOtelSpanBackend for TimeTrace {
+    fn on_request_start(req: &Request, extension: &mut Extensions) -> Span {
+        extension.insert(Instant::now());
+        reqwest_otel_span!(name="example-request", req, time_elapsed = tracing::field::Empty)
+    }
+
+    fn on_request_end(span: &Span, outcome: &Result<Response>, extension: &mut Extensions) {
+        let time_elapsed = extension.get::<Instant>().unwrap().elapsed().as_millis() as i64;
+        default_on_request_end(span, outcome);
+        span.record("time_elapsed", &time_elapsed);
+    }
+}
+
 #[tokio::main]
 async fn main() {
-  let tracer = stdout::new_pipeline().install_simple();
+    let tracer = stdout::new_pipeline().install_simple();
-  let telemetry = tracing_opentelemetry::layer().with_tracer(tracer);
+    let telemetry = tracing_opentelemetry::layer().with_tracer(tracer);
-  let subscriber = Registry::default().with(telemetry);
+    let subscriber = Registry::default().with(telemetry);
-  tracing::subscriber::set_global_default(subscriber).unwrap();
+    tracing::subscriber::set_global_default(subscriber).unwrap();
 
-  run().await;
+    run().await;
 }
 
 async fn run() {
-  let client = ClientBuilder::new(reqwest::Client::new())
+    let client = ClientBuilder::new(reqwest::Client::new())
-    .with(TracingMiddleware)
+        .with(TracingMiddleware::<TimeTrace>::new())
-    .build();
+        .build();
 
-  client.get("https://truelayer.com").send().await.unwrap();
+    client.get("https://truelayer.com").send().await.unwrap();
 }
 ```
 
@@ -69,11 +89,12 @@ an opentelemetry version feature:
 ```toml
 [dependencies]
 # ...
-reqwest-tracing = { version = "0.1.0", features = ["opentelemetry_0_16"] }
+reqwest-tracing = { version = "0.3.1", features = ["opentelemetry_0_18"] }
 ```
 
-Available opentelemetry features are `opentelemetry_0_16`, `opentelemetry_0_15`, `opentelemetry_0_14` and
+Available opentelemetry features are `opentelemetry_0_21`, `opentelemetry_0_20`,
-`opentelemetry_0_13`.
+`opentelemetry_0_19`, `opentelemetry_0_18`, `opentelemetry_0_17`, `opentelemetry_0_16`,
+`opentelemetry_0_15`, `opentelemetry_0_14` and `opentelemetry_0_13`.
 
 #### License
 

reqwest-tracing/src/lib.rs

@@ -1,6 +1,86 @@
-//! Opentracing middleware implementation for [`reqwest-middleware`].
+//! Opentracing middleware implementation for [`reqwest_middleware`].
 //!
 //! Attach [`TracingMiddleware`] to your client to automatically trace HTTP requests.
+//!
+//! The simplest possible usage:
+//! ```no_run
+//! # use reqwest_middleware::Result;
+//! use reqwest_middleware::{ClientBuilder};
+//! use reqwest_tracing::TracingMiddleware;
+//!
+//! # async fn example() -> Result<()> {
+//! let reqwest_client = reqwest::Client::builder().build().unwrap();
+//! let client = ClientBuilder::new(reqwest_client)
+//!    // Insert the tracing middleware
+//!    .with(TracingMiddleware::default())
+//!    .build();
+//!
+//! let resp = client.get("https://truelayer.com").send().await.unwrap();
+//! # Ok(())
+//! # }
+//! ```
+//!
+//! To customise the span names use [`OtelName`].
+//! ```no_run
+//! # use reqwest_middleware::Result;
+//! use reqwest_middleware::{ClientBuilder, Extension};
+//! use reqwest_tracing::{
+//!     TracingMiddleware, OtelName
+//! };
+//! # async fn example() -> Result<()> {
+//! let reqwest_client = reqwest::Client::builder().build().unwrap();
+//! let client = ClientBuilder::new(reqwest_client)
+//!    // Inserts the extension before the request is started
+//!    .with_init(Extension(OtelName("my-client".into())))
+//!    // Makes use of that extension to specify the otel name
+//!    .with(TracingMiddleware::default())
+//!    .build();
+//!
+//! let resp = client.get("https://truelayer.com").send().await.unwrap();
+//!
+//! // Or specify it on the individual request (will take priority)
+//! let resp = client.post("https://api.truelayer.com/payment")
+//!     .with_extension(OtelName("POST /payment".into()))
+//!    .send()
+//!    .await
+//!    .unwrap();
+//! # Ok(())
+//! # }
+//! ```
+//!
+//! In this example we define a custom span builder to calculate the request time elapsed and we register the [`TracingMiddleware`].
+//!
+//! Note that Opentelemetry tracks start and stop already, there is no need to have a custom builder like this.
+//! ```rust
+//! use reqwest_middleware::Result;
+//! use task_local_extensions::Extensions;
+//! use reqwest::{Request, Response};
+//! use reqwest_middleware::ClientBuilder;
+//! use reqwest_tracing::{
+//!     default_on_request_end, reqwest_otel_span, ReqwestOtelSpanBackend, TracingMiddleware
+//! };
+//! use tracing::Span;
+//! use std::time::{Duration, Instant};
+//!
+//! pub struct TimeTrace;
+//!
+//! impl ReqwestOtelSpanBackend for TimeTrace {
+//!     fn on_request_start(req: &Request, extension: &mut Extensions) -> Span {
+//!         extension.insert(Instant::now());
+//!         reqwest_otel_span!(name="example-request", req, time_elapsed = tracing::field::Empty)
+//!     }
+//!
+//!     fn on_request_end(span: &Span, outcome: &Result<Response>, extension: &mut Extensions) {
+//!         let time_elapsed = extension.get::<Instant>().unwrap().elapsed().as_millis() as i64;
+//!         default_on_request_end(span, outcome);
+//!         span.record("time_elapsed", &time_elapsed);
+//!     }
+//! }
+//!
+//! let http = ClientBuilder::new(reqwest::Client::new())
+//!     .with(TracingMiddleware::<TimeTrace>::new())
+//!     .build();
+//! ```
 
 mod middleware;
 #[cfg(any(
@@ -8,7 +88,22 @@ mod middleware;
     feature = "opentelemetry_0_14",
     feature = "opentelemetry_0_15",
     feature = "opentelemetry_0_16",
+    feature = "opentelemetry_0_17",
+    feature = "opentelemetry_0_18",
+    feature = "opentelemetry_0_19",
+    feature = "opentelemetry_0_20",
+    feature = "opentelemetry_0_21",
 ))]
 mod otel;
-
+mod reqwest_otel_span_builder;
 pub use middleware::TracingMiddleware;
+pub use reqwest_otel_span_builder::{
+    default_on_request_end, default_on_request_failure, default_on_request_success,
+    default_span_name, DefaultSpanBackend, DisableOtelPropagation, OtelName, OtelPathNames,
+    ReqwestOtelSpanBackend, SpanBackendWithUrl, ERROR_CAUSE_CHAIN, ERROR_MESSAGE, HTTP_HOST,
+    HTTP_METHOD, HTTP_SCHEME, HTTP_STATUS_CODE, HTTP_URL, HTTP_USER_AGENT, NET_HOST_PORT,
+    OTEL_KIND, OTEL_NAME, OTEL_STATUS_CODE,
+};
+
+#[doc(hidden)]
+pub mod reqwest_otel_span_macro;

reqwest-tracing/src/middleware.rs

@@ -1,130 +1,75 @@
-use reqwest::header::{HeaderMap, HeaderValue};
+use reqwest::{Request, Response};
-use reqwest::{Request, Response, StatusCode as RequestStatusCode};
+use reqwest_middleware::{Middleware, Next, Result};
-use reqwest_middleware::{Error, Middleware, Next, Result};
 use task_local_extensions::Extensions;
+use tracing::Instrument;
+
+use crate::{DefaultSpanBackend, ReqwestOtelSpanBackend};
 
 /// Middleware for tracing requests using the current Opentelemetry Context.
-pub struct TracingMiddleware;
+pub struct TracingMiddleware<S: ReqwestOtelSpanBackend> {
+    span_backend: std::marker::PhantomData<S>,
+}
 
-#[async_trait::async_trait]
+impl<S: ReqwestOtelSpanBackend> TracingMiddleware<S> {
-impl Middleware for TracingMiddleware {
+    pub fn new() -> TracingMiddleware<S> {
+        TracingMiddleware {
+            span_backend: Default::default(),
+        }
+    }
+}
+
+impl<S: ReqwestOtelSpanBackend> Clone for TracingMiddleware<S> {
+    fn clone(&self) -> Self {
+        Self::new()
+    }
+}
+
+impl Default for TracingMiddleware<DefaultSpanBackend> {
+    fn default() -> Self {
+        TracingMiddleware::new()
+    }
+}
+
+#[cfg_attr(not(target_arch = "wasm32"), async_trait::async_trait)]
+#[cfg_attr(target_arch = "wasm32", async_trait::async_trait(?Send))]
+impl<ReqwestOtelSpan> Middleware for TracingMiddleware<ReqwestOtelSpan>
+where
+    ReqwestOtelSpan: ReqwestOtelSpanBackend + Sync + Send + 'static,
+{
     async fn handle(
         &self,
         req: Request,
         extensions: &mut Extensions,
         next: Next<'_>,
     ) -> Result<Response> {
-        let request_span = {
+        let request_span = ReqwestOtelSpan::on_request_start(&req, extensions);
-            let method = req.method();
-            let scheme = req.url().scheme();
-            let host = req.url().host_str().unwrap_or("");
-            let host_port = req.url().port().unwrap_or(0) as i64;
-            let path = req.url().path();
-            let otel_name = format!("{} {}", method, path);
 
-            tracing::info_span!(
+        let outcome_future = async {
-                "HTTP request",
+            #[cfg(any(
-                http.method = %method,
+                feature = "opentelemetry_0_13",
-                http.scheme = %scheme,
+                feature = "opentelemetry_0_14",
-                http.host = %host,
+                feature = "opentelemetry_0_15",
-                net.host.port = %host_port,
+                feature = "opentelemetry_0_16",
-                otel.kind = "client",
+                feature = "opentelemetry_0_17",
-                otel.name = %otel_name,
+                feature = "opentelemetry_0_18",
-                otel.status_code = tracing::field::Empty,
+                feature = "opentelemetry_0_19",
-                http.user_agent = tracing::field::Empty,
+                feature = "opentelemetry_0_20",
-                http.status_code = tracing::field::Empty,
+                feature = "opentelemetry_0_21",
-                error.message = tracing::field::Empty,
+            ))]
-                error.cause_chain = tracing::field::Empty,
+            let req = if !extensions.contains::<crate::DisableOtelPropagation>() {
-            )
+                // Adds tracing headers to the given request to propagate the OpenTelemetry context to downstream revivers of the request.
+                // Spans added by downstream consumers will be part of the same trace.
+                crate::otel::inject_opentelemetry_context_into_request(req)
+            } else {
+                req
+            };
+
+            // Run the request
+            let outcome = next.run(req, extensions).await;
+            ReqwestOtelSpan::on_request_end(&request_span, &outcome, extensions);
+            outcome
         };
 
-        // Adds tracing headers to the given request to propagate the OpenTracing context to downstream revivers of the request.
+        outcome_future.instrument(request_span.clone()).await
-        // Spans added by downstream consumers will be part of the same trace.
-        #[cfg(any(
-            feature = "opentelemetry_0_13",
-            feature = "opentelemetry_0_14",
-            feature = "opentelemetry_0_15",
-            feature = "opentelemetry_0_16",
-        ))]
-        let req = crate::otel::inject_opentracing_context_into_request(&request_span, req);
-
-        // Run the request
-        let outcome = next.run(req, extensions).await;
-        match &outcome {
-            Ok(response) => {
-                // The request ran successfully
-                let span_status = get_span_status(response.status());
-                let status_code = response.status().as_u16() as i64;
-                let user_agent = get_header_value("user_agent", response.headers());
-                if let Some(span_status) = span_status {
-                    request_span.record("otel.status_code", &span_status);
-                }
-                request_span.record("http.status_code", &status_code);
-                request_span.record("http.user_agent", &user_agent.as_str());
-            }
-            Err(e) => {
-                // The request didn't run successfully
-                let error_message = e.to_string();
-                let error_cause_chain = format!("{:?}", e);
-                request_span.record("otel.status_code", &"ERROR");
-                request_span.record("error.message", &error_message.as_str());
-                request_span.record("error.cause_chain", &error_cause_chain.as_str());
-                if let Error::Reqwest(e) = e {
-                    request_span.record(
-                        "http.status_code",
-                        &e.status()
-                            .map(|s| s.to_string())
-                            .unwrap_or_else(|| "".to_string())
-                            .as_str(),
-                    );
-                }
-            }
-        }
-        outcome
-    }
-}
-
-fn get_header_value(key: &str, headers: &HeaderMap) -> String {
-    let header_default = &HeaderValue::from_static("");
-    format!("{:?}", headers.get(key).unwrap_or(header_default)).replace("\"", "")
-}
-
-/// HTTP Mapping <https://github.com/open-telemetry/opentelemetry-specification/blob/c4b7f4307de79009c97b3a98563e91fee39b7ba3/work_in_progress/opencensus/HTTP.md#status>
-// | HTTP code               | Span status code      |
-// |-------------------------|-----------------------|
-// | 100...299               | `Ok`                  |
-// | 3xx redirect codes      | `DeadlineExceeded` in case of loop (see above) [1], otherwise `Ok` |
-// | 401 Unauthorized ⚠      | `Unauthenticated` ⚠ (Unauthorized actually means unauthenticated according to [RFC 7235][rfc-unauthorized])  |
-// | 403 Forbidden           | `PermissionDenied`    |
-// | 404 Not Found           | `NotFound`            |
-// | 429 Too Many Requests   | `ResourceExhausted`   |
-// | Other 4xx code          | `InvalidArgument` [1] |
-// | 501 Not Implemented     | `Unimplemented`       |
-// | 503 Service Unavailable | `Unavailable`         |
-// | 504 Gateway Timeout     | `DeadlineExceeded`    |
-// | Other 5xx code          | `InternalError` [1]   |
-// | Any status code the client fails to interpret (e.g., 093 or 573) | `UnknownError` |
-///
-/// Maps the the http status to an Opentelemetry span status following the the specified convention above.
-fn get_span_status(request_status: RequestStatusCode) -> Option<&'static str> {
-    match request_status.as_u16() {
-        100..=399 => Some("OK"),
-        400..=599 => Some("ERROR"),
-        _ => None,
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn get_header_value_for_span_attribute() {
-        let expect = "IMPORTANT_HEADER";
-        let mut header_map = HeaderMap::new();
-        header_map.insert("test", expect.parse().unwrap());
-
-        let value = get_header_value("test", &header_map);
-        assert_eq!(value, expect);
     }
 }

reqwest-tracing/src/otel.rs

@@ -15,6 +15,21 @@ use opentelemetry_0_15_pkg as opentelemetry;
 #[cfg(feature = "opentelemetry_0_16")]
 use opentelemetry_0_16_pkg as opentelemetry;
 
+#[cfg(feature = "opentelemetry_0_17")]
+use opentelemetry_0_17_pkg as opentelemetry;
+
+#[cfg(feature = "opentelemetry_0_18")]
+use opentelemetry_0_18_pkg as opentelemetry;
+
+#[cfg(feature = "opentelemetry_0_19")]
+use opentelemetry_0_19_pkg as opentelemetry;
+
+#[cfg(feature = "opentelemetry_0_20")]
+use opentelemetry_0_20_pkg as opentelemetry;
+
+#[cfg(feature = "opentelemetry_0_21")]
+use opentelemetry_0_21_pkg as opentelemetry;
+
 #[cfg(feature = "opentelemetry_0_13")]
 pub use tracing_opentelemetry_0_12_pkg as tracing_opentelemetry;
 
@@ -27,14 +42,28 @@ pub use tracing_opentelemetry_0_14_pkg as tracing_opentelemetry;
 #[cfg(feature = "opentelemetry_0_16")]
 pub use tracing_opentelemetry_0_16_pkg as tracing_opentelemetry;
 
+#[cfg(feature = "opentelemetry_0_17")]
+pub use tracing_opentelemetry_0_17_pkg as tracing_opentelemetry;
+
+#[cfg(feature = "opentelemetry_0_18")]
+pub use tracing_opentelemetry_0_18_pkg as tracing_opentelemetry;
+
+#[cfg(feature = "opentelemetry_0_19")]
+pub use tracing_opentelemetry_0_19_pkg as tracing_opentelemetry;
+
+#[cfg(feature = "opentelemetry_0_20")]
+pub use tracing_opentelemetry_0_20_pkg as tracing_opentelemetry;
+
+#[cfg(feature = "opentelemetry_0_21")]
+pub use tracing_opentelemetry_0_22_pkg as tracing_opentelemetry;
+
 use opentelemetry::global;
 use opentelemetry::propagation::Injector;
 use tracing_opentelemetry::OpenTelemetrySpanExt;
 
-/// Injects the given Opentelemetry Context into a reqwest::Request headers to allow propagation downstream.
+/// Injects the given OpenTelemetry Context into a reqwest::Request headers to allow propagation downstream.
-pub fn inject_opentracing_context_into_request(span: &Span, request: Request) -> Request {
+pub fn inject_opentelemetry_context_into_request(mut request: Request) -> Request {
-    let context = span.context();
+    let context = Span::current().context();
-    let mut request = request;
 
     global::get_text_map_propagator(|injector| {
         injector.inject_context(&context, &mut RequestCarrier::new(&mut request))
@@ -66,3 +95,126 @@ impl<'a> Injector for RequestCarrier<'a> {
         self.request.headers_mut().insert(header_name, header_value);
     }
 }
+
+#[cfg(test)]
+mod test {
+    use std::sync::OnceLock;
+
+    use super::*;
+    use crate::{DisableOtelPropagation, TracingMiddleware};
+    #[cfg(not(feature = "opentelemetry_0_21"))]
+    use opentelemetry::sdk::propagation::TraceContextPropagator;
+    #[cfg(feature = "opentelemetry_0_21")]
+    use opentelemetry_sdk_0_21::propagation::TraceContextPropagator;
+    use reqwest::Response;
+    use reqwest_middleware::{ClientBuilder, ClientWithMiddleware, Extension};
+    use tracing::{info_span, Instrument, Level};
+    #[cfg(any(
+        feature = "opentelemetry_0_13",
+        feature = "opentelemetry_0_14",
+        feature = "opentelemetry_0_15"
+    ))]
+    use tracing_subscriber_0_2::{filter, layer::SubscriberExt, Registry};
+    #[cfg(not(any(
+        feature = "opentelemetry_0_13",
+        feature = "opentelemetry_0_14",
+        feature = "opentelemetry_0_15"
+    )))]
+    use tracing_subscriber_0_3::{filter, layer::SubscriberExt, Registry};
+    use wiremock::{matchers::any, Mock, MockServer, ResponseTemplate};
+
+    async fn make_echo_request_in_otel_context(client: ClientWithMiddleware) -> Response {
+        static TELEMETRY: OnceLock<()> = OnceLock::new();
+
+        TELEMETRY.get_or_init(|| {
+            #[cfg(all(
+                not(feature = "opentelemetry_0_20"),
+                not(feature = "opentelemetry_0_21")
+            ))]
+            let tracer = opentelemetry::sdk::export::trace::stdout::new_pipeline()
+                .with_writer(std::io::sink())
+                .install_simple();
+            #[cfg(any(feature = "opentelemetry_0_20", feature = "opentelemetry_0_21"))]
+            let tracer = {
+                use opentelemetry::trace::TracerProvider;
+                #[cfg(feature = "opentelemetry_0_20")]
+                use opentelemetry_stdout_0_1::SpanExporterBuilder;
+                #[cfg(feature = "opentelemetry_0_21")]
+                use opentelemetry_stdout_0_2::SpanExporterBuilder;
+
+                let exporter = SpanExporterBuilder::default()
+                    .with_writer(std::io::sink())
+                    .build();
+
+                #[cfg(feature = "opentelemetry_0_20")]
+                let provider = opentelemetry::sdk::trace::TracerProvider::builder()
+                    .with_simple_exporter(exporter)
+                    .build();
+                #[cfg(feature = "opentelemetry_0_21")]
+                let provider = opentelemetry_sdk_0_21::trace::TracerProvider::builder()
+                    .with_simple_exporter(exporter)
+                    .build();
+                let tracer = provider.versioned_tracer("reqwest", None::<&str>, None::<&str>, None);
+                let _ = global::set_tracer_provider(provider);
+                tracer
+            };
+            let telemetry = tracing_opentelemetry::layer().with_tracer(tracer);
+            let subscriber = Registry::default()
+                .with(
+                    filter::Targets::new().with_target("reqwest_tracing::otel::test", Level::DEBUG),
+                )
+                .with(telemetry);
+            tracing::subscriber::set_global_default(subscriber).unwrap();
+            global::set_text_map_propagator(TraceContextPropagator::new());
+        });
+
+        // Mock server - sends all request headers back in the response
+        let server = MockServer::start().await;
+        Mock::given(any())
+            .respond_with(|req: &wiremock::Request| {
+                req.headers
+                    .iter()
+                    .fold(ResponseTemplate::new(200), |resp, (k, v)| {
+                        resp.append_header(k.clone(), v.clone())
+                    })
+            })
+            .mount(&server)
+            .await;
+
+        client
+            .get(server.uri())
+            .send()
+            .instrument(info_span!("some_span"))
+            .await
+            .unwrap()
+    }
+
+    #[tokio::test]
+    async fn tracing_middleware_propagates_otel_data_even_when_the_span_is_disabled() {
+        let client = ClientBuilder::new(reqwest::Client::new())
+            .with(TracingMiddleware::default())
+            .build();
+
+        let resp = make_echo_request_in_otel_context(client).await;
+
+        assert!(
+            resp.headers().contains_key("traceparent"),
+            "by default, the tracing middleware will propagate otel contexts"
+        );
+    }
+
+    #[tokio::test]
+    async fn context_no_propagated() {
+        let client = ClientBuilder::new(reqwest::Client::new())
+            .with_init(Extension(DisableOtelPropagation))
+            .with(TracingMiddleware::default())
+            .build();
+
+        let resp = make_echo_request_in_otel_context(client).await;
+
+        assert!(
+            !resp.headers().contains_key("traceparent"),
+            "request should not contain traceparent if context propagation is disabled"
+        );
+    }
+}

reqwest-tracing/src/reqwest_otel_span_builder.rs

@@ -0,0 +1,370 @@
+use std::borrow::Cow;
+
+use matchit::Router;
+use reqwest::header::{HeaderMap, HeaderValue};
+use reqwest::{Request, Response, StatusCode as RequestStatusCode, Url};
+use reqwest_middleware::{Error, Result};
+use task_local_extensions::Extensions;
+use tracing::{warn, Span};
+
+use crate::reqwest_otel_span;
+
+/// The `http.method` field added to the span by [`reqwest_otel_span`]
+pub const HTTP_METHOD: &str = "http.method";
+/// The `http.scheme` field added to the span by [`reqwest_otel_span`]
+pub const HTTP_SCHEME: &str = "http.scheme";
+/// The `http.host` field added to the span by [`reqwest_otel_span`]
+pub const HTTP_HOST: &str = "http.host";
+/// The `http.url` field added to the span by [`reqwest_otel_span`]
+pub const HTTP_URL: &str = "http.url";
+/// The `host.port` field added to the span by [`reqwest_otel_span`]
+pub const NET_HOST_PORT: &str = "net.host.port";
+/// The `otel.kind` field added to the span by [`reqwest_otel_span`]
+pub const OTEL_KIND: &str = "otel.kind";
+/// The `otel.name` field added to the span by [`reqwest_otel_span`]
+pub const OTEL_NAME: &str = "otel.name";
+/// The `otel.status_code` field added to the span by [`reqwest_otel_span`]
+pub const OTEL_STATUS_CODE: &str = "otel.status_code";
+/// The `error.message` field added to the span by [`reqwest_otel_span`]
+pub const ERROR_MESSAGE: &str = "error.message";
+/// The `error.cause_chain` field added to the span by [`reqwest_otel_span`]
+pub const ERROR_CAUSE_CHAIN: &str = "error.cause_chain";
+/// The `http.status_code` field added to the span by [`reqwest_otel_span`]
+pub const HTTP_STATUS_CODE: &str = "http.status_code";
+/// The `http.user_agent` added to the span by [`reqwest_otel_span`]
+pub const HTTP_USER_AGENT: &str = "http.user_agent";
+
+/// [`ReqwestOtelSpanBackend`] allows you to customise the span attached by
+/// [`TracingMiddleware`] to incoming requests.
+///
+/// Check out [`reqwest_otel_span`] documentation for examples.
+///
+/// [`TracingMiddleware`]: crate::middleware::TracingMiddleware.
+pub trait ReqwestOtelSpanBackend {
+    /// Initalized a new span before the request is executed.
+    fn on_request_start(req: &Request, extension: &mut Extensions) -> Span;
+
+    /// Runs after the request call has executed.
+    fn on_request_end(span: &Span, outcome: &Result<Response>, extension: &mut Extensions);
+}
+
+/// Populates default success/failure fields for a given [`reqwest_otel_span!`] span.
+#[inline]
+pub fn default_on_request_end(span: &Span, outcome: &Result<Response>) {
+    match outcome {
+        Ok(res) => default_on_request_success(span, res),
+        Err(err) => default_on_request_failure(span, err),
+    }
+}
+
+/// Populates default success fields for a given [`reqwest_otel_span!`] span.
+#[inline]
+pub fn default_on_request_success(span: &Span, response: &Response) {
+    let span_status = get_span_status(response.status());
+    let user_agent = get_header_value("user_agent", response.headers());
+    if let Some(span_status) = span_status {
+        span.record(OTEL_STATUS_CODE, span_status);
+    }
+    span.record(HTTP_STATUS_CODE, response.status().as_u16());
+    span.record(HTTP_USER_AGENT, user_agent.as_str());
+}
+
+/// Populates default failure fields for a given [`reqwest_otel_span!`] span.
+#[inline]
+pub fn default_on_request_failure(span: &Span, e: &Error) {
+    let error_message = e.to_string();
+    let error_cause_chain = format!("{:?}", e);
+    span.record(OTEL_STATUS_CODE, "ERROR");
+    span.record(ERROR_MESSAGE, error_message.as_str());
+    span.record(ERROR_CAUSE_CHAIN, error_cause_chain.as_str());
+    if let Error::Reqwest(e) = e {
+        if let Some(status) = e.status() {
+            span.record(HTTP_STATUS_CODE, status.as_u16());
+        }
+    }
+}
+
+/// Determine the name of the span that should be associated with this request.
+///
+/// This tries to be PII safe by default, not including any path information unless
+/// specifically opted in using either [`OtelName`] or [`OtelPathNames`]
+#[inline]
+pub fn default_span_name<'a>(req: &'a Request, ext: &'a Extensions) -> Cow<'a, str> {
+    if let Some(name) = ext.get::<OtelName>() {
+        Cow::Borrowed(name.0.as_ref())
+    } else if let Some(path_names) = ext.get::<OtelPathNames>() {
+        path_names
+            .find(req.url().path())
+            .map(|path| Cow::Owned(format!("{} {}", req.method(), path)))
+            .unwrap_or_else(|| {
+                warn!("no OTEL path name found");
+                Cow::Owned(format!("{} UNKNOWN", req.method().as_str()))
+            })
+    } else {
+        Cow::Borrowed(req.method().as_str())
+    }
+}
+
+/// The default [`ReqwestOtelSpanBackend`] for [`TracingMiddleware`]. Note that it doesn't include
+/// the `http.url` field in spans, you can use [`SpanBackendWithUrl`] to add it.
+///
+/// [`TracingMiddleware`]: crate::middleware::TracingMiddleware
+pub struct DefaultSpanBackend;
+
+impl ReqwestOtelSpanBackend for DefaultSpanBackend {
+    fn on_request_start(req: &Request, ext: &mut Extensions) -> Span {
+        let name = default_span_name(req, ext);
+        reqwest_otel_span!(name = name, req)
+    }
+
+    fn on_request_end(span: &Span, outcome: &Result<Response>, _: &mut Extensions) {
+        default_on_request_end(span, outcome)
+    }
+}
+
+fn get_header_value(key: &str, headers: &HeaderMap) -> String {
+    let header_default = &HeaderValue::from_static("");
+    format!("{:?}", headers.get(key).unwrap_or(header_default)).replace('"', "")
+}
+
+/// Similar to [`DefaultSpanBackend`] but also adds the `http.url` attribute to request spans.
+///
+/// [`TracingMiddleware`]: crate::middleware::TracingMiddleware
+pub struct SpanBackendWithUrl;
+
+impl ReqwestOtelSpanBackend for SpanBackendWithUrl {
+    fn on_request_start(req: &Request, ext: &mut Extensions) -> Span {
+        let name = default_span_name(req, ext);
+        reqwest_otel_span!(name = name, req, http.url = %remove_credentials(req.url()))
+    }
+
+    fn on_request_end(span: &Span, outcome: &Result<Response>, _: &mut Extensions) {
+        default_on_request_end(span, outcome)
+    }
+}
+
+/// HTTP Mapping <https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/semantic_conventions/http.md#status>
+///
+/// Maps the the http status to an Opentelemetry span status following the the specified convention above.
+fn get_span_status(request_status: RequestStatusCode) -> Option<&'static str> {
+    match request_status.as_u16() {
+        // Span Status MUST be left unset if HTTP status code was in the 1xx, 2xx or 3xx ranges, unless there was
+        // another error (e.g., network error receiving the response body; or 3xx codes with max redirects exceeded),
+        // in which case status MUST be set to Error.
+        100..=399 => None,
+        // For HTTP status codes in the 4xx range span status MUST be left unset in case of SpanKind.SERVER and MUST be
+        // set to Error in case of SpanKind.CLIENT.
+        400..=499 => Some("ERROR"),
+        // For HTTP status codes in the 5xx range, as well as any other code the client failed to interpret, span
+        // status MUST be set to Error.
+        _ => Some("ERROR"),
+    }
+}
+
+/// [`OtelName`] allows customisation of the name of the spans created by
+/// [`DefaultSpanBackend`] and [`SpanBackendWithUrl`].
+///
+/// Usage:
+/// ```no_run
+/// # use reqwest_middleware::Result;
+/// use reqwest_middleware::{ClientBuilder, Extension};
+/// use reqwest_tracing::{
+///     TracingMiddleware, OtelName
+/// };
+/// # async fn example() -> Result<()> {
+/// let reqwest_client = reqwest::Client::builder().build().unwrap();
+/// let client = ClientBuilder::new(reqwest_client)
+///    // Inserts the extension before the request is started
+///    .with_init(Extension(OtelName("my-client".into())))
+///    // Makes use of that extension to specify the otel name
+///    .with(TracingMiddleware::default())
+///    .build();
+///
+/// let resp = client.get("https://truelayer.com").send().await.unwrap();
+///
+/// // Or specify it on the individual request (will take priority)
+/// let resp = client.post("https://api.truelayer.com/payment")
+///     .with_extension(OtelName("POST /payment".into()))
+///    .send()
+///    .await
+///    .unwrap();
+/// # Ok(())
+/// # }
+/// ```
+#[derive(Clone)]
+pub struct OtelName(pub Cow<'static, str>);
+
+/// [`OtelPathNames`] allows including templated paths in the spans created by
+/// [`DefaultSpanBackend`] and [`SpanBackendWithUrl`].
+///
+/// When creating spans this can be used to try to match the path against some
+/// known paths. If the path matches value returned is the templated path. This
+/// can be used in span names as it will not contain values that would
+/// increase the cardinality.
+///
+/// ```
+/// /// # use reqwest_middleware::Result;
+/// use reqwest_middleware::{ClientBuilder, Extension};
+/// use reqwest_tracing::{
+///     TracingMiddleware, OtelPathNames
+/// };
+/// # async fn example() -> Result<(), Box<dyn std::error::Error>> {
+/// let reqwest_client = reqwest::Client::builder().build()?;
+/// let client = ClientBuilder::new(reqwest_client)
+///    // Inserts the extension before the request is started
+///    .with_init(Extension(OtelPathNames::known_paths(["/payment/:paymentId"])?))
+///    // Makes use of that extension to specify the otel name
+///    .with(TracingMiddleware::default())
+///    .build();
+///
+/// let resp = client.get("https://truelayer.com/payment/id-123").send().await?;
+///
+/// // Or specify it on the individual request (will take priority)
+/// let resp = client.post("https://api.truelayer.com/payment/id-123/authorization-flow")
+///     .with_extension(OtelPathNames::known_paths(["/payment/:paymentId/authorization-flow"])?)
+///    .send()
+///    .await?;
+/// # Ok(())
+/// # }
+/// ```
+#[derive(Clone)]
+pub struct OtelPathNames(matchit::Router<String>);
+
+impl OtelPathNames {
+    /// Create a new [`OtelPathNames`] from a set of known paths.
+    ///
+    /// Paths in this set will be found with `find`.
+    ///
+    /// Paths can have different parameters:
+    /// - Named parameters like `:paymentId` match anything until the next `/` or the end of the path.
+    /// - Catch-all parameters start with `*` and match everything after the `/`. They must be at the end of the route.
+    /// ```
+    /// # use reqwest_tracing::OtelPathNames;
+    /// OtelPathNames::known_paths([
+    ///     "/",
+    ///     "/payment",
+    ///     "/payment/:paymentId",
+    ///     "/payment/:paymentId/*action",
+    /// ]).unwrap();
+    /// ```
+    pub fn known_paths<Paths, Path>(paths: Paths) -> anyhow::Result<Self>
+    where
+        Paths: IntoIterator<Item = Path>,
+        Path: Into<String>,
+    {
+        let mut router = Router::new();
+        for path in paths {
+            let path = path.into();
+            router.insert(path.clone(), path)?;
+        }
+
+        Ok(Self(router))
+    }
+
+    /// Find the templated path from the actual path.
+    ///
+    /// Returns the templated path if a match is found.
+    ///
+    /// ```
+    /// # use reqwest_tracing::OtelPathNames;
+    /// let path_names = OtelPathNames::known_paths(["/payment/:paymentId"]).unwrap();
+    /// let path = path_names.find("/payment/payment-id-123");
+    /// assert_eq!(path, Some("/payment/:paymentId"));
+    /// ```
+    pub fn find(&self, path: &str) -> Option<&str> {
+        self.0.at(path).map(|mtch| mtch.value.as_str()).ok()
+    }
+}
+
+/// `DisableOtelPropagation` disables opentelemetry header propagation, while still tracing the HTTP request.
+///
+/// By default, the [`TracingMiddleware`](super::TracingMiddleware) middleware will also propagate any opentelemtry
+/// contexts to the server. For any external facing requests, this can be problematic and it should be disabled.
+///
+/// Usage:
+/// ```no_run
+/// # use reqwest_middleware::Result;
+/// use reqwest_middleware::{ClientBuilder, Extension};
+/// use reqwest_tracing::{
+///     TracingMiddleware, DisableOtelPropagation
+/// };
+/// # async fn example() -> Result<()> {
+/// let reqwest_client = reqwest::Client::builder().build().unwrap();
+/// let client = ClientBuilder::new(reqwest_client)
+///    // Inserts the extension before the request is started
+///    .with_init(Extension(DisableOtelPropagation))
+///    // Makes use of that extension to specify the otel name
+///    .with(TracingMiddleware::default())
+///    .build();
+///
+/// let resp = client.get("https://truelayer.com").send().await.unwrap();
+///
+/// // Or specify it on the individual request (will take priority)
+/// let resp = client.post("https://api.truelayer.com/payment")
+///     .with_extension(DisableOtelPropagation)
+///     .send()
+///     .await
+///     .unwrap();
+/// # Ok(())
+/// # }
+/// ```
+#[derive(Clone)]
+pub struct DisableOtelPropagation;
+
+/// Removes the username and/or password parts of the url, if present.
+fn remove_credentials(url: &Url) -> Cow<'_, str> {
+    if !url.username().is_empty() || url.password().is_some() {
+        let mut url = url.clone();
+        // Errors settings username/password are set when the URL can't have credentials, so
+        // they're just ignored.
+        url.set_username("")
+            .and_then(|_| url.set_password(None))
+            .ok();
+        url.to_string().into()
+    } else {
+        url.as_ref().into()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn get_header_value_for_span_attribute() {
+        let expect = "IMPORTANT_HEADER";
+        let mut header_map = HeaderMap::new();
+        header_map.insert("test", expect.parse().unwrap());
+
+        let value = get_header_value("test", &header_map);
+        assert_eq!(value, expect);
+    }
+
+    #[test]
+    fn remove_credentials_from_url_without_credentials_is_noop() {
+        let url = "http://nocreds.com/".parse().unwrap();
+        let clean = remove_credentials(&url);
+        assert_eq!(clean, "http://nocreds.com/");
+    }
+
+    #[test]
+    fn remove_credentials_removes_username_only() {
+        let url = "http://user@withuser.com/".parse().unwrap();
+        let clean = remove_credentials(&url);
+        assert_eq!(clean, "http://withuser.com/");
+    }
+
+    #[test]
+    fn remove_credentials_removes_password_only() {
+        let url = "http://:123@withpwd.com/".parse().unwrap();
+        let clean = remove_credentials(&url);
+        assert_eq!(clean, "http://withpwd.com/");
+    }
+
+    #[test]
+    fn remove_credentials_removes_username_and_password() {
+        let url = "http://user:123@both.com/".parse().unwrap();
+        let clean = remove_credentials(&url);
+        assert_eq!(clean, "http://both.com/");
+    }
+}

reqwest-tracing/src/reqwest_otel_span_macro.rs

@@ -0,0 +1,175 @@
+#[macro_export]
+/// [`reqwest_otel_span!`](crate::reqwest_otel_span) creates a new [`tracing::Span`].
+/// It empowers you to add custom properties to the span on top of the default properties provided by the macro
+///
+/// Default Fields:
+/// - http.method
+/// - http.scheme
+/// - http.host
+/// - net.host
+/// - otel.kind
+/// - otel.name
+/// - otel.status_code
+/// - http.user_agent
+/// - http.status_code
+/// - error.message
+/// - error.cause_chain
+///
+/// Here are some convenient functions to checkout [`default_on_request_success`], [`default_on_request_failure`],
+/// and [`default_on_request_end`].
+///
+/// # Why a macro?
+///
+/// [`tracing`] requires all the properties attached to a span to be declared upfront, when the span is created.
+/// You cannot add new ones afterwards.
+/// This makes it extremely fast, but it pushes us to reach for macros when we need some level of composition.
+///
+/// # Macro syntax
+///
+/// The first argument is a [span name](https://opentelemetry.io/docs/reference/specification/trace/api/#span).
+/// The second argument passed to [`reqwest_otel_span!`](crate::reqwest_otel_span) is a reference to an [`reqwest::Request`].
+///
+/// ```rust
+/// use reqwest_middleware::Result;
+/// use task_local_extensions::Extensions;
+/// use reqwest::{Request, Response};
+/// use reqwest_tracing::{
+///     default_on_request_end, reqwest_otel_span, ReqwestOtelSpanBackend
+/// };
+/// use tracing::Span;
+///
+/// pub struct CustomReqwestOtelSpanBackend;
+///
+/// impl ReqwestOtelSpanBackend for CustomReqwestOtelSpanBackend {
+///     fn on_request_start(req: &Request, _extension: &mut Extensions) -> Span {
+///         reqwest_otel_span!(name = "reqwest-http-request", req)
+///     }
+///
+///     fn on_request_end(span: &Span, outcome: &Result<Response>, _extension: &mut Extensions) {
+///         default_on_request_end(span, outcome)
+///     }
+/// }
+/// ```
+///
+/// If nothing else is specified, the span generated by `reqwest_otel_span!` is identical to the one you'd
+/// get by using [`DefaultSpanBackend`]. Note that to avoid leaking sensitive information, the
+/// macro doesn't include `http.url`, even though it's required by opentelemetry. You can add the
+/// URL attribute explicitly by usng [`SpanBackendWithUrl`] instead of `DefaultSpanBackend` or
+/// adding the field on your own implementation.
+///
+/// You can define new fields following the same syntax of [`tracing::info_span!`] for fields:
+///
+/// ```rust,should_panic
+/// use reqwest_tracing::reqwest_otel_span;
+/// # let request: &reqwest::Request = todo!();
+///
+/// // Define a `time_elapsed` field as empty. It might be populated later.
+/// // (This example is just to show how to inject data - otel already tracks durations)
+/// reqwest_otel_span!(name = "reqwest-http-request", request, time_elapsed = tracing::field::Empty);
+///
+/// // Define a `name` field with a known value, `AppName`.
+/// reqwest_otel_span!(name = "reqwest-http-request", request, name = "AppName");
+///
+/// // Define an `app_id` field using the variable with the same name as value.
+/// let app_id = "XYZ";
+/// reqwest_otel_span!(name = "reqwest-http-request", request, app_id);
+///
+/// // All together
+/// reqwest_otel_span!(name = "reqwest-http-request", request, time_elapsed = tracing::field::Empty, name = "AppName", app_id);
+/// ```
+///
+/// You can also choose to customise the level of the generated span:
+///
+/// ```rust,should_panic
+/// use reqwest_tracing::reqwest_otel_span;
+/// use tracing::Level;
+/// # let request: &reqwest::Request = todo!();
+///
+/// // Reduce the log level for service endpoints/probes
+/// let level = if request.method().as_str() == "POST" {
+///     Level::DEBUG
+/// } else {
+///     Level::INFO
+/// };
+///
+/// // `level =` and name MUST come before the request, in this order
+/// reqwest_otel_span!(level = level, name = "reqwest-http-request", request);
+/// ```
+///
+///
+/// [`DefaultSpanBackend`]: crate::reqwest_otel_span_builder::DefaultSpanBackend
+/// [`SpanBackendWithUrl`]: crate::reqwest_otel_span_builder::DefaultSpanBackend
+/// [`default_on_request_success`]: crate::reqwest_otel_span_builder::default_on_request_success
+/// [`default_on_request_failure`]: crate::reqwest_otel_span_builder::default_on_request_failure
+/// [`default_on_request_end`]: crate::reqwest_otel_span_builder::default_on_request_end
+macro_rules! reqwest_otel_span {
+    // Vanilla root span at default INFO level, with no additional fields
+    (name=$name:expr, $request:ident) => {
+        reqwest_otel_span!(name=$name, $request,)
+    };
+    // Vanilla root span, with no additional fields but custom level
+    (level=$level:expr, name=$name:expr, $request:ident) => {
+        reqwest_otel_span!(level=$level, name=$name, $request,)
+    };
+    // Root span with additional fields, default INFO level
+    (name=$name:expr, $request:ident, $($field:tt)*) => {
+        reqwest_otel_span!(level=$crate::reqwest_otel_span_macro::private::Level::INFO, name=$name, $request, $($field)*)
+    };
+    // Root span with additional fields and custom level
+    (level=$level:expr, name=$name:expr, $request:ident, $($field:tt)*) => {
+        {
+            let method = $request.method();
+            let url = $request.url();
+            let scheme = url.scheme();
+            let host = url.host_str().unwrap_or("");
+            let host_port = url.port().unwrap_or(0) as i64;
+            let otel_name = $name.to_string();
+
+            macro_rules! request_span {
+                ($lvl:expr) => {
+                    $crate::reqwest_otel_span_macro::private::span!(
+                        $lvl,
+                        "HTTP request",
+                        http.method = %method,
+                        http.scheme = %scheme,
+                        http.host = %host,
+                        net.host.port = %host_port,
+                        otel.kind = "client",
+                        otel.name = %otel_name,
+                        otel.status_code = tracing::field::Empty,
+                        http.user_agent = tracing::field::Empty,
+                        http.status_code = tracing::field::Empty,
+                        error.message = tracing::field::Empty,
+                        error.cause_chain = tracing::field::Empty,
+                        $($field)*
+                    )
+                }
+            }
+
+            let span = match $level {
+                $crate::reqwest_otel_span_macro::private::Level::TRACE => {
+                    request_span!($crate::reqwest_otel_span_macro::private::Level::TRACE)
+                },
+                $crate::reqwest_otel_span_macro::private::Level::DEBUG => {
+                    request_span!($crate::reqwest_otel_span_macro::private::Level::DEBUG)
+                },
+                $crate::reqwest_otel_span_macro::private::Level::INFO => {
+                    request_span!($crate::reqwest_otel_span_macro::private::Level::INFO)
+                },
+                $crate::reqwest_otel_span_macro::private::Level::WARN => {
+                    request_span!($crate::reqwest_otel_span_macro::private::Level::WARN)
+                },
+                $crate::reqwest_otel_span_macro::private::Level::ERROR => {
+                    request_span!($crate::reqwest_otel_span_macro::private::Level::ERROR)
+                },
+            };
+            span
+        }
+    }
+}
+
+#[doc(hidden)]
+pub mod private {
+    #[doc(hidden)]
+    pub use tracing::{span, Level};
+}