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mock_server.rs
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mock_server.rs
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
use hyper::service::{make_service_fn, service_fn};
use hyper::{Body, Request, Response, Server};
use parking_lot::Mutex;
use std::collections::VecDeque;
use std::convert::Infallible;
use std::net::SocketAddr;
use std::sync::Arc;
use tokio::sync::oneshot;
use tokio::task::JoinHandle;
pub type ResponseFn = Box<dyn FnOnce(Request<Body>) -> Response<Body> + Send>;
/// A mock server
pub struct MockServer {
responses: Arc<Mutex<VecDeque<ResponseFn>>>,
shutdown: oneshot::Sender<()>,
handle: JoinHandle<()>,
url: String,
}
impl MockServer {
pub fn new() -> Self {
let responses: Arc<Mutex<VecDeque<ResponseFn>>> =
Arc::new(Mutex::new(VecDeque::with_capacity(10)));
let r = Arc::clone(&responses);
let make_service = make_service_fn(move |_conn| {
let r = Arc::clone(&r);
async move {
Ok::<_, Infallible>(service_fn(move |req| {
let r = Arc::clone(&r);
async move {
Ok::<_, Infallible>(match r.lock().pop_front() {
Some(r) => r(req),
None => Response::new(Body::from("Hello World")),
})
}
}))
}
});
let (shutdown, rx) = oneshot::channel::<()>();
let server =
Server::bind(&SocketAddr::from(([127, 0, 0, 1], 0))).serve(make_service);
let url = format!("http://{}", server.local_addr());
let handle = tokio::spawn(async move {
server
.with_graceful_shutdown(async {
rx.await.ok();
})
.await
.unwrap()
});
Self {
responses,
shutdown,
handle,
url,
}
}
/// The url of the mock server
pub fn url(&self) -> &str {
&self.url
}
/// Add a response
pub fn push(&self, response: Response<Body>) {
self.push_fn(|_| response)
}
/// Add a response function
pub fn push_fn<F>(&self, f: F)
where
F: FnOnce(Request<Body>) -> Response<Body> + Send + 'static,
{
self.responses.lock().push_back(Box::new(f))
}
/// Shutdown the mock server
pub async fn shutdown(self) {
let _ = self.shutdown.send(());
self.handle.await.unwrap()
}
}