2021-08-02 23:09:09 +02:00
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//! Run with
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//!
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//! ```not_rust
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//! cargo run --example versioning
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//! ```
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2021-07-09 21:36:14 +02:00
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use axum::response::IntoResponse;
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2021-07-22 13:23:50 +02:00
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use axum::{
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async_trait,
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extract::{FromRequest, RequestParts},
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prelude::*,
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};
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2021-06-13 13:50:56 +02:00
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use http::Response;
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use http::StatusCode;
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use std::net::SocketAddr;
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#[tokio::main]
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async fn main() {
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2021-08-05 11:25:03 +02:00
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// Set the RUST_LOG, if it hasn't been explicitly defined
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if std::env::var("RUST_LOG").is_err() {
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std::env::set_var("RUST_LOG", "versioning=debug")
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}
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2021-08-05 19:43:03 +02:00
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tracing_subscriber::fmt::init();
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2021-08-01 22:01:33 +02:00
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2021-06-13 13:50:56 +02:00
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// build our application with some routes
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let app = route("/:version/foo", get(handler));
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// run it
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let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
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tracing::debug!("listening on {}", addr);
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2021-08-04 15:38:51 +02:00
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axum::Server::bind(&addr)
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2021-06-19 12:50:33 +02:00
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.serve(app.into_make_service())
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.await
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.unwrap();
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2021-06-13 13:50:56 +02:00
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}
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async fn handler(version: Version) {
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println!("received request with version {:?}", version);
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}
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#[derive(Debug)]
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enum Version {
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V1,
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V2,
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V3,
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}
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#[async_trait]
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2021-06-19 12:50:33 +02:00
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impl<B> FromRequest<B> for Version
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where
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B: Send,
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{
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2021-06-13 13:50:56 +02:00
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type Rejection = Response<Body>;
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2021-07-22 13:23:50 +02:00
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async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
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2021-06-13 13:50:56 +02:00
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let params = extract::UrlParamsMap::from_request(req)
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.await
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.map_err(IntoResponse::into_response)?;
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let version = params
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.get("version")
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.ok_or_else(|| (StatusCode::NOT_FOUND, "version param missing").into_response())?;
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match version {
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"v1" => Ok(Version::V1),
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"v2" => Ok(Version::V2),
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"v3" => Ok(Version::V3),
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_ => Err((StatusCode::NOT_FOUND, "unknown version").into_response()),
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}
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}
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}
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