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* @TrueLayer/rust-oss

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---
name: Bug report
about: Create a report to help us improve
title: ''
labels: bug
assignees: ''
---
## Bug description
<!-- A clear and concise description of what the bug is. -->
## To Reproduce
<!-- Steps to reproduce the behavior. -->
## Expected behavior
<!-- A clear and concise description of what you expected to happen. -->
## Environment
<!-- Please fill the following information. -->
- OS: [e.g. Windows]
- Rust version [e.g. 1.51.0]
## Additional context
<!-- Add any other context about the problem here. -->

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blank_issues_enabled: true

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---
name: Feature request
about: Suggest an idea for this project
title: ''
labels: enhancement
assignees: ''
---
## Motivations
<!--
If your feature request is related to a problem, please describe it.
Ex. I hate when [...]
-->
## Solution
<!-- Describe the solution you'd like. -->
## Alternatives
<!-- Describe any alternative solutions or features you've considered. -->
## Additional context
<!-- Add any other context or screenshots about the feature request here. -->

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<!-- Please explain the changes you made -->
<!--
Please, make sure:
- you have read the contributing guidelines:
https://github.com/TrueLayer/reqwest-middleware/blob/main/docs/CONTRIBUTING.md
- you have formatted the code using rustfmt:
https://github.com/rust-lang/rustfmt
- you have checked that all tests pass, by running `cargo test --all`
- you have updated the changelog (if needed):
https://github.com/TrueLayer/reqwest-middleware/blob/main/CHANGELOG.md
-->

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name: Security audit
on:
schedule:
# Runs at 00:00 UTC everyday
- cron: '0 0 * * *'
push:
paths:
- '**/Cargo.toml'
- '**/Cargo.lock'
pull_request:
jobs:
audit:
runs-on: ubuntu-latest
steps:
- name: Checkout repository
uses: actions/checkout@v2
- uses: actions-rs/audit-check@v1
with:
token: ${{ secrets.GITHUB_TOKEN }}

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on:
push:
branches: [main]
pull_request:
name: CI # Continuous Integration
jobs:
test:
name: Test Suite
runs-on: ubuntu-latest
steps:
- name: Checkout repository
uses: actions/checkout@v2
- name: Install Rust
uses: actions-rs/toolchain@v1
with:
toolchain: stable
profile: minimal
override: true
- uses: actions-rs/cargo@v1
with:
command: test
args: --workspace --all-targets --features opentelemetry_0_15
rustfmt:
name: Rustfmt
runs-on: ubuntu-latest
steps:
- name: Checkout repository
uses: actions/checkout@v2
- name: Install Rust
uses: actions-rs/toolchain@v1
with:
toolchain: stable
profile: minimal
override: true
components: rustfmt
- name: Check formatting
uses: actions-rs/cargo@v1
with:
command: fmt
args: --all -- --check
clippy:
name: Clippy
runs-on: ubuntu-latest
steps:
- name: Checkout repository
uses: actions/checkout@v2
- name: Install Rust
uses: actions-rs/toolchain@v1
with:
toolchain: stable
profile: minimal
override: true
components: clippy
- name: Clippy check
uses: actions-rs/cargo@v1
with:
command: clippy
args: --all-targets --features opentelemetry_0_15 --workspace -- -D warnings
docs:
name: Docs
runs-on: ubuntu-latest
steps:
- name: Checkout repository
uses: actions/checkout@v2
- name: Install Rust
uses: actions-rs/toolchain@v1
with:
toolchain: stable
profile: minimal
override: true
- name: Check documentation
env:
RUSTDOCFLAGS: -D warnings
uses: actions-rs/cargo@v1
with:
command: doc
args: --no-deps --document-private-items --features opentelemetry_0_15 --workspace
publish-check:
name: Publish dry run
runs-on: ubuntu-latest
steps:
- name: Checkout repository
uses: actions/checkout@v2
- uses: actions-rs/toolchain@v1
with:
toolchain: stable
profile: minimal
override: true
- uses: actions-rs/cargo@v1
with:
command: publish
args: --dry-run --manifest-path reqwest-middleware/Cargo.toml
- uses: actions-rs/cargo@v1
with:
command: publish
args: --dry-run --manifest-path reqwest-retry/Cargo.toml
- uses: actions-rs/cargo@v1
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'

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/target
Cargo.lock

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# Changelog
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]

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# Code of Conduct
This project adheres to the Rust Code of Conduct, which [can be found online](https://www.rust-lang.org/conduct.html).

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# Contribution guidelines
First off, thank you for considering contributing to reqwest-middleware.
If your contribution is not straightforward, please first discuss the change you
wish to make by creating a new issue before making the change.
## Reporting issues
Before reporting an issue on the
[issue tracker](https://github.com/TrueLayer/reqwest-middleware/issues),
please check that it has not already been reported by searching for some related
keywords.
## Pull requests
Try to do one pull request per change.
### Updating the changelog
Update the changes you have made in
[CHANGELOG](https://github.com/TrueLayer/reqwest-middleware/blob/master/CHANGELOG.md)
file under the **Unreleased** section.
Add the changes of your pull request to one of the following subsections,
depending on the types of changes defined by
[Keep a changelog](https://keepachangelog.com/en/1.0.0/):
- `Added` for new features.
- `Changed` for changes in existing functionality.
- `Deprecated` for soon-to-be removed features.
- `Removed` for now removed features.
- `Fixed` for any bug fixes.
- `Security` in case of vulnerabilities.
If the required subsection does not exist yet under **Unreleased**, create it!
## Developing
### Set up
This is no different than other Rust projects.
```shell
git clone https://github.com/TrueLayer/reqwest-middleware
cd reqwest-middleware
cargo test
```
### Useful Commands
- Run Clippy:
```shell
cargo clippy
```
- Check to see if there are code formatting issues
```shell
cargo fmt --all -- --check
```
- Format the code in the project
```shell
cargo fmt --all
```

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[workspace]
members = [
"reqwest-middleware",
"reqwest-tracing",
"reqwest-retry",
]

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MIT License
Copyright (c) 2021 TrueLayer
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# reqwest-middleware
A crate implementing a wrapper around [reqwest](https://crates.io/crates/reqwest)
to allow for client middleware chains.
[![Crates.io](https://img.shields.io/crates/v/reqwest-middleware.svg)](https://crates.io/crates/reqwest-middleware)
[![Docs.rs](https://docs.rs/reqwest-middleware/badge.svg)](https://docs.rs/reqwest-middleware)
[![CI](https://github.com/TrueLayer/reqwest-middleware/workflows/CI/badge.svg)](https://github.com/TrueLayer/reqwest-middleware/actions)
[![Coverage Status](https://coveralls.io/repos/github/TrueLayer/reqwest-middleware/badge.svg?branch=main&t=YKhONc)](https://coveralls.io/github/TrueLayer/reqwest-middleware?branch=main)
## Overview
The `reqwest-middleware` client exposes the same interface as a plain `reqwest` client, but
`ClientBuilder` exposes functionality to attach middleware:
```rust
use reqwest_middleware::{ClientBuilder, ClientWithMiddleware};
use reqwest_retry::{RetryTransientMiddleware, policies::ExponentialBackoff};
use reqwest_tracing::TracingMiddleware;
#[tokio::main]
async fn main() {
    let retry_policy = ExponentialBackoff::builder().build_with_max_retries(3);
    let client = ClientBuilder::new(reqwest::Client::new())
        .with(TracingMiddleware)
        .with(RetryTransientMiddleware::new_with_policy(retry_policy))
        .build();
    run(client).await;
}
async fn run(client: ClientWithMiddleware) {
    // free retries!
    client
        .get("https://some-external-service.com")
        .header("foo", "bar")
        .send()
        .await
        .unwrap();
}
```
## How to install
Add `reqwest-middleware` to your dependencies
```toml
[dependencies]
# ...
reqwest-middleware = "0.1.0"
```
#### License
<sup>
Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
</sup>
<br>
<sub>
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>

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[package]
name = "reqwest-middleware"
version = "0.1.0"
authors = ["Rodrigo Gryzinski <rodrigo.gryzinski@truelayer.com>"]
edition = "2018"
description = "Wrapper around reqwest to allow for client middleware chains."
repository = "https://github.com/TrueLayer/reqwest-middleware"
license = "MIT OR Apache-2.0"
keywords = ["reqwest", "http", "middleware"]
categories = ["web-programming::http-client"]
readme = "../README.md"
[dependencies]
anyhow = "1"
async-trait = "0.1.51"
futures = "0.3"
http = "0.2"
reqwest = { version = "0.11", features = ["json", "multipart"] }
serde = "1"
thiserror = "1"
truelayer-extensions = "0.1"
[dev-dependencies]
wiremock = "0.5"
tokio = { version = "1", features = ["macros"] }

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use reqwest::header::{HeaderMap, HeaderName, HeaderValue};
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::sync::Arc;
use std::time::Duration;
use truelayer_extensions::Extensions;
use crate::error::Result;
use crate::middleware::{Middleware, Next};
/// A `ClientBuilder` is used to build a [`ClientWithMiddleware`].
///
/// [`ClientWithMiddleware`]: struct.ClientWithMiddleware.html
pub struct ClientBuilder {
client: Client,
middleware_stack: Vec<Arc<dyn Middleware>>,
}
impl ClientBuilder {
pub fn new(client: Client) -> Self {
ClientBuilder {
client,
middleware_stack: Vec::new(),
}
}
/// Convenience method to attach middleware.
///
/// If you need to keep a reference to the middleware after attaching, use [`with_arc`].
///
/// [`with_arc`]: #method.with_arc
pub fn with<M>(self, middleware: M) -> Self
where
M: Middleware,
{
self.with_arc(Arc::new(middleware))
}
/// Add middleware to the chain. [`with`] is more ergonomic if you don't need the `Arc`.
///
/// [`with`]: #method.with
pub fn with_arc(mut self, middleware: Arc<dyn Middleware>) -> Self {
self.middleware_stack.push(middleware);
self
}
/// Returns a `ClientWithMiddleware` using this builder configuration.
pub fn build(self) -> ClientWithMiddleware {
ClientWithMiddleware::new(self.client, self.middleware_stack)
}
}
/// `ClientWithMiddleware` is a wrapper around [`reqwest::Client`] which runs middleware on every
/// request.
///
/// [`reqwest::Client`]: https://docs.rs/reqwest/0.10.8/reqwest/struct.Client.html
#[derive(Clone)]
pub struct ClientWithMiddleware {
inner: reqwest::Client,
middleware_stack: Box<[Arc<dyn Middleware>]>,
}
impl ClientWithMiddleware {
/// See [`ClientBuilder`] for a more ergonomic way to build `ClientWithMiddleware` instances.
///
/// [`ClientBuilder`]: struct.ClientBuilder.html
pub fn new<T>(client: Client, middleware_stack: T) -> Self
where
T: Into<Box<[Arc<dyn Middleware>]>>,
{
ClientWithMiddleware {
inner: client,
middleware_stack: middleware_stack.into(),
}
}
/// See [`Client::get`](https://docs.rs/reqwest/latest/reqwest/struct.Client.html#method.get)
pub fn get<U: IntoUrl>(&self, url: U) -> RequestBuilder {
self.request(Method::GET, url)
}
/// See [`Client::post`](https://docs.rs/reqwest/latest/reqwest/struct.Client.html#method.post)
pub fn post<U: IntoUrl>(&self, url: U) -> RequestBuilder {
self.request(Method::POST, url)
}
/// See [`Client::put`](https://docs.rs/reqwest/latest/reqwest/struct.Client.html#method.put)
pub fn put<U: IntoUrl>(&self, url: U) -> RequestBuilder {
self.request(Method::PUT, url)
}
/// See
/// [`Client::patch`](https://docs.rs/reqwest/latest/reqwest/struct.Client.html#method.patch)
pub fn patch<U: IntoUrl>(&self, url: U) -> RequestBuilder {
self.request(Method::PATCH, url)
}
/// See
/// [`Client::delete`](https://docs.rs/reqwest/latest/reqwest/struct.Client.html#method.delete)
pub fn delete<U: IntoUrl>(&self, url: U) -> RequestBuilder {
self.request(Method::DELETE, url)
}
/// See [`Client::head`](https://docs.rs/reqwest/latest/reqwest/struct.Client.html#method.head)
pub fn head<U: IntoUrl>(&self, url: U) -> RequestBuilder {
self.request(Method::HEAD, url)
}
/// See
/// [`Client::request`](https://docs.rs/reqwest/latest/reqwest/struct.Client.html#method.request)
pub fn request<U: IntoUrl>(&self, method: Method, url: U) -> RequestBuilder {
RequestBuilder {
inner: self.inner.request(method, url),
client: self.clone(),
}
}
/// See
/// [`Client::execute`](https://docs.rs/reqwest/latest/reqwest/struct.Client.html#method.execute)
pub async fn execute(&self, req: Request) -> Result<Response> {
let next = Next::new(&self.inner, &self.middleware_stack);
let mut ext = Extensions::new();
next.run(req, &mut ext).await
}
}
/// Create a `ClientWithMiddleware` without any middleware.
impl From<Client> for ClientWithMiddleware {
fn from(client: Client) -> Self {
ClientWithMiddleware {
inner: client,
middleware_stack: Box::new([]),
}
}
}
/// This is a wrapper around [`reqwest::RequestBuilder`] exposing the same API.
///
/// [`reqwest::RequestBuilder`]: https://docs.rs/reqwest/0.10.8/reqwest/struct.RequestBuilder.html
#[must_use = "RequestBuilder does nothing until you 'send' it"]
pub struct RequestBuilder {
inner: reqwest::RequestBuilder,
client: ClientWithMiddleware,
}
impl RequestBuilder {
pub fn header<K, V>(self, key: K, value: V) -> Self
where
HeaderName: TryFrom<K>,
<HeaderName as TryFrom<K>>::Error: Into<http::Error>,
HeaderValue: TryFrom<V>,
<HeaderValue as TryFrom<V>>::Error: Into<http::Error>,
{
RequestBuilder {
inner: self.inner.header(key, value),
client: self.client,
}
}
pub fn headers(self, headers: HeaderMap) -> Self {
RequestBuilder {
inner: self.inner.headers(headers),
client: self.client,
}
}
pub fn basic_auth<U, P>(self, username: U, password: Option<P>) -> Self
where
U: Display,
P: Display,
{
RequestBuilder {
inner: self.inner.basic_auth(username, password),
client: self.client,
}
}
pub fn bearer_auth<T>(self, token: T) -> Self
where
T: Display,
{
RequestBuilder {
inner: self.inner.bearer_auth(token),
client: self.client,
}
}
pub fn body<T: Into<Body>>(self, body: T) -> Self {
RequestBuilder {
inner: self.inner.body(body),
client: self.client,
}
}
pub fn timeout(self, timeout: Duration) -> Self {
RequestBuilder {
inner: self.inner.timeout(timeout),
client: self.client,
}
}
pub fn multipart(self, multipart: Form) -> Self {
RequestBuilder {
inner: self.inner.multipart(multipart),
client: self.client,
}
}
pub fn query<T: Serialize + ?Sized>(self, query: &T) -> Self {
RequestBuilder {
inner: self.inner.query(query),
client: self.client,
}
}
pub fn form<T: Serialize + ?Sized>(self, form: &T) -> Self {
RequestBuilder {
inner: self.inner.form(form),
client: self.client,
}
}
pub fn json<T: Serialize + ?Sized>(self, json: &T) -> Self {
RequestBuilder {
inner: self.inner.json(json),
client: self.client,
}
}
pub fn build(self) -> reqwest::Result<Request> {
self.inner.build()
}
pub async fn send(self) -> Result<Response> {
let req = self.inner.build()?;
self.client.execute(req).await
}
pub fn try_clone(self) -> Option<Self> {
let client = self.client;
self.inner
.try_clone()
.map(|inner| RequestBuilder { inner, client })
}
}

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use thiserror::Error;
pub type Result<T> = std::result::Result<T, Error>;
#[derive(Error, Debug)]
pub enum Error {
/// There was an error running some middleware
#[error("Middleware error: {0}")]
Middleware(#[from] anyhow::Error),
/// Error from the underlying reqwest client
#[error("Request error: {0}")]
Reqwest(#[from] reqwest::Error),
}
impl Error {
pub fn middleware<E>(err: E) -> Self
where
E: 'static + Send + Sync + std::error::Error,
{
Error::Middleware(err.into())
}
}

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//! This crate provides [`ClientWithMiddleware`], a wrapper around [`reqwest::Client`] with the
//! ability to attach middleware which runs on every request.
//!
//! You'll want to instantiate [`ClientWithMiddleware`] using [`ClientBuilder`], then you can
//! attach your middleware using [`with`], finalize it with [`build`] and from then on sending
//! requests is the same as with reqwest:
//!
//! ```
//! use reqwest::{Client, Request, Response};
//! use reqwest_middleware::{ClientBuilder, Middleware, Next, Result};
//! use truelayer_extensions::Extensions;
//!
//! 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);
//! let res = next.run(req, extensions).await;
//! println!("Result: {:?}", res);
//! res
//! }
//! }
//!
//! async fn run() {
//! let reqwest_client = Client::builder().build().unwrap();
//! let client = ClientBuilder::new(reqwest_client)
//! .with(LoggingMiddleware)
//! .build();
//! let resp = client.get("https://truelayer.com").send().await.unwrap();
//! println!("TrueLayer page HTML: {}", resp.text().await.unwrap());
//! }
//! ```
//!
//! [`build`]: struct.ClientBuilder.html#method.build
//! [`ClientBuilder`]: struct.ClientBuilder.html
//! [`ClientWithMiddleware`]: struct.ClientWithMiddleware.html
//! [`reqwest::Client`]: https://docs.rs/reqwest/0.10.8/reqwest/struct.Client.html
//! [`with`]: struct.ClientBuilder.html#method.with
mod client;
mod error;
mod middleware;
pub use client::{ClientBuilder, ClientWithMiddleware, RequestBuilder};
pub use error::{Error, Result};
pub use middleware::{Middleware, Next};

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use futures::future::{BoxFuture, FutureExt, TryFutureExt};
use reqwest::{Client, Request, Response};
use std::sync::Arc;
use truelayer_extensions::Extensions;
use crate::error::{Error, Result};
/// When attached to a [`ClientWithMiddleware`] (generally using [`with`]), middleware is run
/// whenever the client issues a request, in the order it was attached.
///
/// # Example
///
/// ```
/// use reqwest::{Client, Request, Response};
/// use reqwest_middleware::{ClientBuilder, Middleware, Next, Result};
/// use truelayer_extensions::Extensions;
///
/// struct TransparentMiddleware;
///
/// #[async_trait::async_trait]
/// impl Middleware for TransparentMiddleware {
/// async fn handle(
/// &self,
/// req: Request,
/// extensions: &mut Extensions,
/// next: Next<'_>,
/// ) -> Result<Response> {
/// next.run(req, extensions).await
/// }
/// }
/// ```
///
/// [`ClientWithMiddleware`]: struct.ClientWithMiddleware.html
/// [`Extensions`]: TODO
/// [`with`]: struct.ClientBuilder.html#method.with
#[async_trait::async_trait]
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)`.
///
/// If you need to forward data down the middleware stack, you can use the `extensions`
/// argument.
async fn handle(
&self,
req: Request,
extensions: &mut Extensions,
next: Next<'_>,
) -> Result<Response>;
}
#[async_trait::async_trait]
impl<F> Middleware for F
where
F: Send
+ Sync
+ 'static
+ for<'a> Fn(Request, &'a mut Extensions, Next<'a>) -> BoxFuture<'a, Result<Response>>,
{
async fn handle(
&self,
req: Request,
extensions: &mut Extensions,
next: Next<'_>,
) -> Result<Response> {
(self)(req, extensions, next).await
}
}
/// Next encapsulates the remaining middleware chain to run in [`Middleware::handle`]. You can
/// forward the request down the chain with [`run`].
///
/// [`Middleware::handle`]: trait.Middleware.html#tymethod.handle
/// [`run`]: #method.run
#[derive(Clone)]
pub struct Next<'a> {
client: &'a Client,
middlewares: &'a [Arc<dyn Middleware>],
}
impl<'a> Next<'a> {
pub(crate) fn new(client: &'a Client, middlewares: &'a [Arc<dyn Middleware>]) -> Self {
Next {
client,
middlewares,
}
}
pub fn run(
mut self,
req: Request,
extensions: &'a mut Extensions,
) -> BoxFuture<'a, Result<Response>> {
if let Some((current, rest)) = self.middlewares.split_first() {
self.middlewares = rest;
current.handle(req, extensions, self).boxed()
} else {
self.client.execute(req).map_err(Error::from).boxed()
}
}
}

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/target
Cargo.lock

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# Changelog
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]

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[package]
name = "reqwest-retry"
version = "0.1.0"
authors = ["Rodrigo Gryzinski <rodrigo.gryzinski@truelayer.com>"]
edition = "2018"
description = "Retry middleware for reqwest."
repository = "https://github.com/TrueLayer/reqwest-middleware"
license = "MIT OR Apache-2.0"
keywords = ["reqwest", "http", "middleware", "retry"]
categories = ["web-programming::http-client"]
[dependencies]
reqwest-middleware = { version = "0.1", path = "../reqwest-middleware" }
anyhow = "1"
async-trait = "0.1.51"
chrono = "0.4"
futures = "0.3"
http = "0.2"
retry-policies = "0.1"
reqwest = "0.11"
tokio = { version = "1.6", features = ["time"] }
tracing = "0.1.26"
truelayer-extensions = "0.1"
[dev-dependencies]
wiremock = "0.5"
tokio = { version = "1", features = ["macros"] }
paste = "1"

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# reqwest-retry
Retry middleware implementation for
[`reqwest-middleware`](https://crates.io/crates/reqwest-middleware).
[![Crates.io](https://img.shields.io/crates/v/reqwest-retry.svg)](https://crates.io/crates/reqwest-retry)
[![Docs.rs](https://docs.rs/reqwest-retry/badge.svg)](https://docs.rs/reqwest-retry)
[![CI](https://github.com/TrueLayer/reqwest-middleware/workflows/CI/badge.svg)](https://github.com/TrueLayer/reqwest-middleware/actions)
[![Coverage Status](https://coveralls.io/repos/github/TrueLayer/reqwest-middleware/badge.svg?branch=main&t=UWgSpm)](https://coveralls.io/github/TrueLayer/reqwest-middleware?branch=main)
## Overview
Build `RetryTransientMiddleware` from a `RetryPolicy`, then attach it to a
`reqwest_middleware::ClientBuilder`.
[`retry-policies::policies`](https://crates.io/crates/retry-policies) is reexported under
`reqwest_retry::policies` for convenience.
## How to install
Add `reqwest-retry` to your dependencies
```toml
[dependencies]
# ...
reqwest-retry = "0.1.0"
```
#### License
<sup>
Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
</sup>
<br>
<sub>
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>

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mod middleware;
mod retryable;
pub use retry_policies::policies;
pub use middleware::RetryTransientMiddleware;
pub use retryable::Retryable;

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//! `RetryTransientMiddleware` implements retrying requests on transient errors.
use crate::retryable::Retryable;
use anyhow::anyhow;
use chrono::Utc;
use reqwest::{Request, Response};
use reqwest_middleware::{Error, Middleware, Next, Result};
use retry_policies::RetryPolicy;
use truelayer_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__
/// between each request retry.
///
///```rust
/// use reqwest_middleware::ClientBuilder;
/// use reqwest_retry::{RetryTransientMiddleware, policies::ExponentialBackoff};
/// use reqwest::Client;
///
/// // We create a ExponentialBackoff retry policy which implements `RetryPolicy`.
/// let retry_policy = ExponentialBackoff {
/// /// How many times the policy will tell the middleware to retry the request.
/// max_n_retries: 3,
/// max_retry_interval: std::time::Duration::from_millis(30),
/// min_retry_interval: std::time::Duration::from_millis(100),
/// backoff_exponent: 2,
/// };
///
/// let retry_transient_middleware = RetryTransientMiddleware::new_with_policy(retry_policy);
/// let client = ClientBuilder::new(Client::new()).with(retry_transient_middleware).build();
///```
///
pub struct RetryTransientMiddleware<T: RetryPolicy + Send + Sync + 'static> {
retry_policy: T,
}
impl<T: RetryPolicy + Send + Sync> RetryTransientMiddleware<T> {
/// Construct `RetryTransientMiddleware` with a [retry_policy][retry_policies::RetryPolicy].
pub fn new_with_policy(retry_policy: T) -> Self {
Self { retry_policy }
}
}
#[async_trait::async_trait]
impl<T: RetryPolicy + Send + Sync> Middleware for RetryTransientMiddleware<T> {
async fn handle(
&self,
req: Request,
extensions: &mut Extensions,
next: Next<'_>,
) -> Result<Response> {
// TODO: Ideally we should create a new instance of the `Extensions` map to pass
// 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)
.await
}
}
impl<T: RetryPolicy + Send + Sync> RetryTransientMiddleware<T> {
/// **RECURSIVE**.
///
/// SAFETY: The condition for termination is the number of retries
/// 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.
///
/// 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,
n_past_retries: u32,
) -> futures::future::BoxFuture<'a, Result<Response>> {
Box::pin(async move {
// 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)
// since the byte abstraction is a shared pointer over a buffer.
let duplicate_request = req.try_clone().ok_or_else(|| {
Error::Middleware(anyhow!(
"Request object is not clonable. Are you passing a streaming body?".to_string()
))
})?;
let cloned_next = next.clone();
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) {
Some(retryable)
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);
if let retry_policies::RetryDecision::Retry { execute_after } = retry_decicion {
let duration = (execute_after - Utc::now())
.to_std()
.map_err(Error::middleware)?;
// Sleep the requested amount before we try again.
tracing::warn!(
"Retry attempt #{}. Sleeping {:?} before the next attempt",
n_past_retries,
duration
);
tokio::time::sleep(duration).await;
self.execute_with_retry_recursive(
duplicate_request,
cloned_next,
ext,
n_past_retries + 1,
)
.await
} else {
result
}
}
Some(_) | None => result,
}
})
}
}

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use http::StatusCode;
use reqwest_middleware::Error;
/// Classification of an error/status returned by request.
#[derive(PartialEq, Eq)]
pub enum Retryable {
/// The failure was due to something tha might resolve in the future.
Transient,
/// Unresolvable error.
Fatal,
}
impl Retryable {
/// Try to map a `reqwest` response into `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 {
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_request()
|| error.is_builder()
|| error.is_redirect()
{
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
}
}
},
}
}
}
impl From<&reqwest::Error> for Retryable {
fn from(_status: &reqwest::Error) -> Retryable {
Retryable::Transient
}
}

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use paste::paste;
use reqwest::Client;
use reqwest::StatusCode;
use reqwest_middleware::ClientBuilder;
use reqwest_retry::{policies::ExponentialBackoff, RetryTransientMiddleware};
use std::sync::{
atomic::{AtomicU32, Ordering},
Arc,
};
use wiremock::matchers::{method, path};
use wiremock::{Mock, MockServer, Respond, ResponseTemplate};
pub struct RetryResponder(Arc<AtomicU32>, u32, u16);
impl RetryResponder {
fn new(retries: u32, status_code: u16) -> Self {
Self(Arc::new(AtomicU32::new(0)), retries, status_code)
}
}
impl Respond for RetryResponder {
fn respond(&self, _request: &wiremock::Request) -> ResponseTemplate {
let mut retries = self.0.load(Ordering::SeqCst);
retries += 1;
self.0.store(retries, Ordering::SeqCst);
if retries + 1 >= self.1 {
ResponseTemplate::new(200)
} else {
ResponseTemplate::new(self.2)
}
}
}
macro_rules! assert_retry_succeeds_inner {
($x:tt, $name:ident, $status:expr, $retry:tt, $exact:tt, $responder:expr) => {
#[tokio::test]
async fn $name() {
let server = MockServer::start().await;
let retry_amount: u32 = $retry;
Mock::given(method("GET"))
.and(path("/foo"))
.respond_with($responder)
.expect($exact)
.mount(&server)
.await;
let reqwest_client = Client::builder().build().unwrap();
let client = ClientBuilder::new(reqwest_client)
.with(RetryTransientMiddleware::new_with_policy(
ExponentialBackoff {
max_n_retries: retry_amount,
max_retry_interval: std::time::Duration::from_millis(30),
min_retry_interval: std::time::Duration::from_millis(100),
backoff_exponent: 2,
},
))
.build();
let resp = client
.get(&format!("{}/foo", server.uri()))
.send()
.await
.expect("call failed");
assert_eq!(resp.status(), $status);
}
};
}
macro_rules! assert_retry_succeeds {
($x:tt, $status:expr) => {
paste! {
assert_retry_succeeds_inner!($x, [<assert_retry_succeds_on_ $x>], $status, 3, 2, RetryResponder::new(3 as u32, $x));
}
};
}
macro_rules! assert_no_retry {
($x:tt, $status:expr) => {
paste! {
assert_retry_succeeds_inner!($x, [<assert_no_retry_on_ $x>], $status, 1, 1, ResponseTemplate::new($x));
}
};
}
// 2xx.
assert_no_retry!(200, StatusCode::OK);
assert_no_retry!(201, StatusCode::CREATED);
assert_no_retry!(202, StatusCode::ACCEPTED);
assert_no_retry!(203, StatusCode::NON_AUTHORITATIVE_INFORMATION);
assert_no_retry!(204, StatusCode::NO_CONTENT);
assert_no_retry!(205, StatusCode::RESET_CONTENT);
assert_no_retry!(206, StatusCode::PARTIAL_CONTENT);
assert_no_retry!(207, StatusCode::MULTI_STATUS);
assert_no_retry!(226, StatusCode::IM_USED);
// 3xx.
assert_no_retry!(300, StatusCode::MULTIPLE_CHOICES);
assert_no_retry!(301, StatusCode::MOVED_PERMANENTLY);
assert_no_retry!(302, StatusCode::FOUND);
assert_no_retry!(303, StatusCode::SEE_OTHER);
assert_no_retry!(304, StatusCode::NOT_MODIFIED);
assert_no_retry!(307, StatusCode::TEMPORARY_REDIRECT);
assert_no_retry!(308, StatusCode::PERMANENT_REDIRECT);
// 5xx.
assert_retry_succeeds!(500, StatusCode::OK);
assert_retry_succeeds!(501, StatusCode::OK);
assert_retry_succeeds!(502, StatusCode::OK);
assert_retry_succeeds!(503, StatusCode::OK);
assert_retry_succeeds!(504, StatusCode::OK);
assert_retry_succeeds!(505, StatusCode::OK);
assert_retry_succeeds!(506, StatusCode::OK);
assert_retry_succeeds!(507, StatusCode::OK);
assert_retry_succeeds!(508, StatusCode::OK);
assert_retry_succeeds!(510, StatusCode::OK);
assert_retry_succeeds!(511, StatusCode::OK);
// 4xx.
assert_no_retry!(400, StatusCode::BAD_REQUEST);
assert_no_retry!(401, StatusCode::UNAUTHORIZED);
assert_no_retry!(402, StatusCode::PAYMENT_REQUIRED);
assert_no_retry!(403, StatusCode::FORBIDDEN);
assert_no_retry!(404, StatusCode::NOT_FOUND);
assert_no_retry!(405, StatusCode::METHOD_NOT_ALLOWED);
assert_no_retry!(406, StatusCode::NOT_ACCEPTABLE);
assert_no_retry!(407, StatusCode::PROXY_AUTHENTICATION_REQUIRED);
assert_retry_succeeds!(408, StatusCode::OK);
assert_no_retry!(409, StatusCode::CONFLICT);
assert_no_retry!(410, StatusCode::GONE);
assert_no_retry!(411, StatusCode::LENGTH_REQUIRED);
assert_no_retry!(412, StatusCode::PRECONDITION_FAILED);
assert_no_retry!(413, StatusCode::PAYLOAD_TOO_LARGE);
assert_no_retry!(414, StatusCode::URI_TOO_LONG);
assert_no_retry!(415, StatusCode::UNSUPPORTED_MEDIA_TYPE);
assert_no_retry!(416, StatusCode::RANGE_NOT_SATISFIABLE);
assert_no_retry!(417, StatusCode::EXPECTATION_FAILED);
assert_no_retry!(418, StatusCode::IM_A_TEAPOT);
assert_no_retry!(421, StatusCode::MISDIRECTED_REQUEST);
assert_no_retry!(422, StatusCode::UNPROCESSABLE_ENTITY);
assert_no_retry!(423, StatusCode::LOCKED);
assert_no_retry!(424, StatusCode::FAILED_DEPENDENCY);
assert_no_retry!(426, StatusCode::UPGRADE_REQUIRED);
assert_no_retry!(428, StatusCode::PRECONDITION_REQUIRED);
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 {
fn new(retries: u32, initial_timeout: std::time::Duration) -> Self {
Self(Arc::new(AtomicU32::new(0)), retries, initial_timeout)
}
}
impl Respond for RetryTimeoutResponder {
fn respond(&self, _request: &wiremock::Request) -> ResponseTemplate {
let mut retries = self.0.load(Ordering::SeqCst);
retries += 1;
self.0.store(retries, Ordering::SeqCst);
if retries + 1 >= self.1 {
ResponseTemplate::new(200)
} else {
ResponseTemplate::new(500).set_delay(self.2)
}
}
}
#[tokio::test]
async fn assert_retry_on_request_timeout() {
let server = MockServer::start().await;
Mock::given(method("GET"))
.and(path("/foo"))
.respond_with(RetryTimeoutResponder::new(
3,
std::time::Duration::from_millis(1000),
))
.expect(2)
.mount(&server)
.await;
let reqwest_client = Client::builder().build().unwrap();
let client = ClientBuilder::new(reqwest_client)
.with(RetryTransientMiddleware::new_with_policy(
ExponentialBackoff {
max_n_retries: 3,
max_retry_interval: std::time::Duration::from_millis(30),
min_retry_interval: std::time::Duration::from_millis(100),
backoff_exponent: 2,
},
))
.build();
let resp = client
.get(&format!("{}/foo", server.uri()))
.timeout(std::time::Duration::from_millis(10))
.send()
.await
.expect("call failed");
assert_eq!(resp.status(), 200);
}

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# Changelog
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]

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[package]
name = "reqwest-tracing"
version = "0.1.0"
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"]
categories = ["web-programming::http-client"]
[features]
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"]
[dependencies]
reqwest-middleware = { version = "0.1", path = "../reqwest-middleware" }
async-trait = "0.1.51"
reqwest = "0.11"
tokio = { version = "1.6", features = ["time"] }
tracing = "0.1.26"
truelayer-extensions = "0.1"
opentelemetry_0_13_pkg = { package = "opentelemetry", version = "0.13", optional = true }
opentelemetry_0_14_pkg = { package = "opentelemetry", version = "0.14", optional = true }
opentelemetry_0_15_pkg = { package = "opentelemetry", version = "0.15", optional = true }
tracing-opentelemetry_0_12_pkg = { package = "tracing-opentelemetry",version = "0.12", optional = true }
tracing-opentelemetry_0_13_pkg = { package = "tracing-opentelemetry", version = "0.13", optional = true }
tracing-opentelemetry_0_14_pkg = { package = "tracing-opentelemetry",version = "0.14", optional = true }
[dev-dependencies]
wiremock = "0.5"
tokio = { version = "1", features = ["macros"] }

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# reqwest-tracing
Opentracing middleware implementation for
[`reqwest-middleware`](https://crates.io/crates/reqwest-middleware).
[![Crates.io](https://img.shields.io/crates/v/reqwest-tracing.svg)](https://crates.io/crates/reqwest-tracing)
[![Docs.rs](https://docs.rs/reqwest-tracing/badge.svg)](https://docs.rs/reqwest-tracing)
[![CI](https://github.com/TrueLayer/reqwest-middleware/workflows/CI/badge.svg)](https://github.com/TrueLayer/reqwest-middleware/actions)
[![Coverage Status](https://coveralls.io/repos/github/TrueLayer/reqwest-middleware/badge.svg?branch=main&t=UWgSpm)](https://coveralls.io/github/TrueLayer/reqwest-middleware?branch=main)
## Overview
Attach `TracingMiddleware` to your client to automatically trace HTTP requests:
```rust
use opentelemetry::exporter::trace::stdout;
use reqwest_middleware::ClientBuilder;
use reqwest_tracing::TracingMiddleware;
use tracing_subscriber::layer::SubscriberExt;
use tracing_subscriber::Registry;
#[tokio::main]
async fn main() {
let (tracer, _) = stdout::new_pipeline().install();
let telemetry = tracing_opentelemetry::layer().with_tracer(tracer);
let subscriber = Registry::default().with(telemetry);
tracing::subscriber::set_global_default(subscriber).unwrap();
run().await;
}
async fun run() {
let client = ClientBuilder::new(reqwest::Client::new())
.with(TracingMiddleware)
.build();`
client.get("https://truelayer.com").send().await.unwrap();
}
```
See the [`tracing`](https://crates.io/crates/tracing) crate for more information on how to set up a
tracing subscriber to make use of the spans.
## How to install
Add `reqwest-tracing` to your dependencies. Optionally enable opentelemetry integration by enabling
an opentelemetry version feature:
```toml
[dependencies]
# ...
reqwest-tracing = { version = "0.1.0", features = ["opentelemetry_0_15"] }
```
Available opentelemetry features are `opentelemetry_0_15`, `opentelemetry_0_14` and
`opentelemetry_0_13`.
#### License
<sup>
Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
</sup>
<br>
<sub>
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>

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mod middleware;
#[cfg(any(
feature = "opentelemetry_0_13",
feature = "opentelemetry_0_14",
feature = "opentelemetry_0_15"
))]
mod otel;
pub use middleware::TracingMiddleware;

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use reqwest::header::{HeaderMap, HeaderValue};
use reqwest::{Request, Response, StatusCode as RequestStatusCode};
use reqwest_middleware::{Error, Middleware, Next, Result};
use truelayer_extensions::Extensions;
/// Middleware for tracing requests using the current Opentelemetry Context.
pub struct TracingMiddleware;
#[async_trait::async_trait]
impl Middleware for TracingMiddleware {
async fn handle(
&self,
req: Request,
extensions: &mut Extensions,
next: Next<'_>,
) -> Result<Response> {
let request_span = {
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!(
"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,
)
};
// Adds tracing headers to the given request to propagate the OpenTracing context to downstream revivers of the request.
// 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"
))]
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);
}
}

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use reqwest::header::{HeaderName, HeaderValue};
use reqwest::Request;
use std::str::FromStr;
use tracing::Span;
#[cfg(feature = "opentelemetry_0_13")]
use opentelemetry_0_13_pkg as opentelemetry;
#[cfg(feature = "opentelemetry_0_14")]
use opentelemetry_0_14_pkg as opentelemetry;
#[cfg(feature = "opentelemetry_0_15")]
use opentelemetry_0_15_pkg as opentelemetry;
#[cfg(feature = "opentelemetry_0_13")]
pub use tracing_opentelemetry_0_12_pkg as tracing_opentelemetry;
#[cfg(feature = "opentelemetry_0_14")]
pub use tracing_opentelemetry_0_13_pkg as tracing_opentelemetry;
#[cfg(feature = "opentelemetry_0_15")]
pub use tracing_opentelemetry_0_14_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.
pub fn inject_opentracing_context_into_request(span: &Span, request: Request) -> Request {
let context = span.context();
let mut request = request;
global::get_text_map_propagator(|injector| {
injector.inject_context(&context, &mut RequestCarrier::new(&mut request))
});
request
}
// "traceparent" => https://www.w3.org/TR/trace-context/#trace-context-http-headers-format
/// Injector used via opentelemetry propagator to tell the extractor how to insert the "traceparent" header value
/// This will allow the propagator to inject opentelemetry context into a standard data structure. Will basically
/// insert a "traceparent" string value "{version}-{trace_id}-{span_id}-{trace-flags}" of the spans context into the headers.
/// Listeners can then re-hydrate the context to add additional spans to the same trace.
struct RequestCarrier<'a> {
request: &'a mut Request,
}
impl<'a> RequestCarrier<'a> {
pub fn new(request: &'a mut Request) -> Self {
RequestCarrier { request }
}
}
impl<'a> Injector for RequestCarrier<'a> {
fn set(&mut self, key: &str, value: String) {
let header_name = HeaderName::from_str(key).expect("Must be header name");
let header_value = HeaderValue::from_str(&value).expect("Must be a header value");
self.request.headers_mut().insert(header_name, header_value);
}
}