119 lines
3.9 KiB
Rust
119 lines
3.9 KiB
Rust
#![deny(warnings)]
|
|
|
|
use futures_util::{StreamExt, TryStreamExt};
|
|
use hyper::client::HttpConnector;
|
|
use hyper::service::{make_service_fn, service_fn};
|
|
use hyper::{header, Body, Chunk, Client, Method, Request, Response, Server, StatusCode};
|
|
|
|
type GenericError = Box<dyn std::error::Error + Send + Sync>;
|
|
type Result<T> = std::result::Result<T, GenericError>;
|
|
|
|
static INDEX: &[u8] = b"<a href=\"test.html\">test.html</a>";
|
|
static INTERNAL_SERVER_ERROR: &[u8] = b"Internal Server Error";
|
|
static NOTFOUND: &[u8] = b"Not Found";
|
|
static POST_DATA: &str = r#"{"original": "data"}"#;
|
|
static URL: &str = "http://127.0.0.1:1337/json_api";
|
|
|
|
async fn client_request_response(client: &Client<HttpConnector>) -> Result<Response<Body>> {
|
|
let req = Request::builder()
|
|
.method(Method::POST)
|
|
.uri(URL)
|
|
.header(header::CONTENT_TYPE, "application/json")
|
|
.body(POST_DATA.into())
|
|
.unwrap();
|
|
|
|
let web_res = client.request(req).await?;
|
|
// Compare the JSON we sent (before) with what we received (after):
|
|
let body = Body::wrap_stream(web_res.into_body().map_ok(|b| {
|
|
Chunk::from(format!(
|
|
"<b>POST request body</b>: {}<br><b>Response</b>: {}",
|
|
POST_DATA,
|
|
std::str::from_utf8(&b).unwrap()
|
|
))
|
|
}));
|
|
|
|
Ok(Response::new(body))
|
|
}
|
|
|
|
async fn api_post_response(mut req: Request<Body>) -> Result<Response<Body>> {
|
|
// Concatenate the body...
|
|
let mut whole_body = Vec::new();
|
|
while let Some(chunk) = req.body_mut().next().await {
|
|
whole_body.extend_from_slice(&chunk?);
|
|
}
|
|
// Decode as JSON...
|
|
let mut data: serde_json::Value = serde_json::from_slice(&whole_body)?;
|
|
// Change the JSON...
|
|
data["test"] = serde_json::Value::from("test_value");
|
|
// And respond with the new JSON.
|
|
let json = serde_json::to_string(&data)?;
|
|
let response = Response::builder()
|
|
.status(StatusCode::OK)
|
|
.header(header::CONTENT_TYPE, "application/json")
|
|
.body(Body::from(json))?;
|
|
Ok(response)
|
|
}
|
|
|
|
async fn api_get_response() -> Result<Response<Body>> {
|
|
let data = vec!["foo", "bar"];
|
|
let res = match serde_json::to_string(&data) {
|
|
Ok(json) => Response::builder()
|
|
.header(header::CONTENT_TYPE, "application/json")
|
|
.body(Body::from(json))
|
|
.unwrap(),
|
|
Err(_) => Response::builder()
|
|
.status(StatusCode::INTERNAL_SERVER_ERROR)
|
|
.body(INTERNAL_SERVER_ERROR.into())
|
|
.unwrap(),
|
|
};
|
|
Ok(res)
|
|
}
|
|
|
|
async fn response_examples(
|
|
req: Request<Body>,
|
|
client: Client<HttpConnector>,
|
|
) -> Result<Response<Body>> {
|
|
match (req.method(), req.uri().path()) {
|
|
(&Method::GET, "/") | (&Method::GET, "/index.html") => Ok(Response::new(INDEX.into())),
|
|
(&Method::GET, "/test.html") => client_request_response(&client).await,
|
|
(&Method::POST, "/json_api") => api_post_response(req).await,
|
|
(&Method::GET, "/json_api") => api_get_response().await,
|
|
_ => {
|
|
// Return 404 not found response.
|
|
Ok(Response::builder()
|
|
.status(StatusCode::NOT_FOUND)
|
|
.body(NOTFOUND.into())
|
|
.unwrap())
|
|
}
|
|
}
|
|
}
|
|
|
|
#[tokio::main]
|
|
async fn main() -> Result<()> {
|
|
pretty_env_logger::init();
|
|
|
|
let addr = "127.0.0.1:1337".parse().unwrap();
|
|
|
|
// Share a `Client` with all `Service`s
|
|
let client = Client::new();
|
|
|
|
let new_service = make_service_fn(move |_| {
|
|
// Move a clone of `client` into the `service_fn`.
|
|
let client = client.clone();
|
|
async {
|
|
Ok::<_, GenericError>(service_fn(move |req| {
|
|
// Clone again to ensure that client outlives this closure.
|
|
response_examples(req, client.to_owned())
|
|
}))
|
|
}
|
|
});
|
|
|
|
let server = Server::bind(&addr).serve(new_service);
|
|
|
|
println!("Listening on http://{}", addr);
|
|
|
|
server.await?;
|
|
|
|
Ok(())
|
|
}
|