139 lines
4.2 KiB
Rust
139 lines
4.2 KiB
Rust
use bytes::Buf;
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use futures_util::{stream, StreamExt};
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use hyper::client::HttpConnector;
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use hyper::service::{make_service_fn, service_fn};
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use hyper::{header, Body, Client, Method, Request, Response, Server, StatusCode};
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use itconfig::config;
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config! {
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hyper {
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PREFER_SCHEMA: String => "http",
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static HOST < (
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ADDR => "127.0.0.1",
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":",
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PORT => 8000,
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),
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static JSON_API_URL < (
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HYPER_PREFER_SCHEMA,
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"://",
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HYPER_HOST,
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"/json_api",
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),
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}
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}
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type GenericError = Box<dyn std::error::Error + Send + Sync>;
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type Result<T> = std::result::Result<T, GenericError>;
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static INDEX: &[u8] = b"<a href=\"test.html\">test.html</a>";
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static INTERNAL_SERVER_ERROR: &[u8] = b"Internal Server Error";
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static NOT_FOUND: &[u8] = b"Not Found";
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static POST_DATA: &str = r#"{"original": "data"}"#;
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async fn client_request_response(client: &Client<HttpConnector>) -> Result<Response<Body>> {
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let url = format!("{}/json_api", config::hyper::HOST());
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let req = Request::builder()
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.method(Method::POST)
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.uri(url)
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.header(header::CONTENT_TYPE, "application/json")
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.body(POST_DATA.into())
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.unwrap();
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let web_res = client.request(req).await?;
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// Compare the JSON we sent (before) with what we received (after):
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let before = stream::once(async {
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Ok(format!(
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"<b>POST request body</b>: {}<br><b>Response</b>: ",
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POST_DATA,
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)
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.into())
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});
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let after = web_res.into_body();
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let body = Body::wrap_stream(before.chain(after));
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Ok(Response::new(body))
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}
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async fn api_post_response(req: Request<Body>) -> Result<Response<Body>> {
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// Aggregate the body...
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let whole_body = hyper::body::aggregate(req).await?;
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// Decode as JSON...
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let mut data: serde_json::Value = serde_json::from_reader(whole_body.reader())?;
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// Change the JSON...
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data["test"] = serde_json::Value::from("test_value");
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// And respond with the new JSON.
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let json = serde_json::to_string(&data)?;
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let response = Response::builder()
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.status(StatusCode::OK)
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.header(header::CONTENT_TYPE, "application/json")
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.body(Body::from(json))?;
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Ok(response)
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}
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async fn api_get_response() -> Result<Response<Body>> {
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let data = vec!["foo", "bar"];
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let res = match serde_json::to_string(&data) {
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Ok(json) => Response::builder()
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.header(header::CONTENT_TYPE, "application/json")
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.body(Body::from(json))
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.unwrap(),
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Err(_) => Response::builder()
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.status(StatusCode::INTERNAL_SERVER_ERROR)
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.body(INTERNAL_SERVER_ERROR.into())
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.unwrap(),
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};
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Ok(res)
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}
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async fn response_examples(
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req: Request<Body>,
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client: Client<HttpConnector>,
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) -> Result<Response<Body>> {
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match (req.method(), req.uri().path()) {
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(&Method::GET, "/") | (&Method::GET, "/index.html") => Ok(Response::new(INDEX.into())),
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(&Method::GET, "/test.html") => client_request_response(&client).await,
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(&Method::POST, "/json_api") => api_post_response(req).await,
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(&Method::GET, "/json_api") => api_get_response().await,
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_ => {
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// Return 404 not found response.
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Ok(Response::builder()
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.status(StatusCode::NOT_FOUND)
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.body(NOT_FOUND.into())
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.unwrap())
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}
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}
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}
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#[tokio::main]
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async fn main() -> Result<()> {
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config::init();
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pretty_env_logger::init();
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let addr = config::hyper::HOST().parse().unwrap();
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// Share a `Client` with all `Service`s
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let client = Client::new();
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let new_service = make_service_fn(move |_| {
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// Move a clone of `client` into the `service_fn`.
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let client = client.clone();
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async {
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Ok::<_, GenericError>(service_fn(move |req| {
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// Clone again to ensure that client outlives this closure.
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response_examples(req, client.to_owned())
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}))
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}
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});
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let server = Server::bind(&addr).serve(new_service);
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println!("Listening on http://{}", addr);
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server.await?;
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Ok(())
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}
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