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Add versioning extractor example (#16)
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51
examples/versioning.rs
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51
examples/versioning.rs
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use awebframework::response::IntoResponse;
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use awebframework::{async_trait, extract::FromRequest, prelude::*};
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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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tracing_subscriber::fmt::init();
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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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app.serve(&addr).await.unwrap();
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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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impl FromRequest for Version {
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type Rejection = Response<Body>;
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async fn from_request(req: &mut Request<Body>) -> Result<Self, Self::Rejection> {
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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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