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use crate::mappers::Matcher;
use crate::responders::Responder;
use std::future::Future;
use std::net::SocketAddr;
use std::pin::Pin;
use std::sync::{Arc, Mutex};
type FullRequest = http::Request<hyper::body::Bytes>;
pub struct Server {
trigger_shutdown: Option<futures::channel::oneshot::Sender<()>>,
join_handle: Option<std::thread::JoinHandle<()>>,
addr: SocketAddr,
state: ServerState,
}
impl Server {
pub fn run() -> Self {
use futures::future::FutureExt;
use hyper::{
service::{make_service_fn, service_fn},
Error,
};
let bind_addr = ([127, 0, 0, 1], 0).into();
let state = ServerState::default();
let make_service = make_service_fn({
let state = state.clone();
move |_| {
let state = state.clone();
async move {
let state = state.clone();
Ok::<_, Error>(service_fn({
let state = state.clone();
move |req: http::Request<hyper::Body>| {
let state = state.clone();
async move {
let (head, body) = req.into_parts();
let full_body = hyper::body::to_bytes(body).await?;
let req = http::Request::from_parts(head, full_body);
log::debug!("Received Request: {:?}", req);
let resp = on_req(state, req).await;
log::debug!("Sending Response: {:?}", resp);
hyper::Result::Ok(resp)
}
}
}))
}
}
});
let server = hyper::Server::bind(&bind_addr).serve(make_service);
let addr = server.local_addr();
let (trigger_shutdown, shutdown_received) = futures::channel::oneshot::channel();
let join_handle = std::thread::spawn(move || {
let mut runtime = tokio::runtime::Builder::new()
.basic_scheduler()
.enable_all()
.build()
.unwrap();
runtime.block_on(async move {
futures::select! {
_ = server.fuse() => {},
_ = shutdown_received.fuse() => {},
}
});
});
Server {
trigger_shutdown: Some(trigger_shutdown),
join_handle: Some(join_handle),
addr,
state,
}
}
pub fn addr(&self) -> SocketAddr {
self.addr
}
pub fn url<T>(&self, path_and_query: T) -> hyper::Uri
where
http::uri::PathAndQuery: std::convert::TryFrom<T>,
<http::uri::PathAndQuery as std::convert::TryFrom<T>>::Error: Into<http::Error>,
{
hyper::Uri::builder()
.scheme("http")
.authority(format!("{}", &self.addr).as_str())
.path_and_query(path_and_query)
.build()
.unwrap()
}
pub fn expect(&self, expectation: Expectation) {
self.state.push_expectation(expectation);
}
pub fn verify_and_clear(&mut self) {
let mut state = self.state.lock();
if std::thread::panicking() {
state.expected.clear();
return;
}
for expectation in state.expected.iter() {
let is_valid_cardinality = match &expectation.cardinality {
Times::AnyNumber => true,
Times::AtLeast(lower_bound) if expectation.hit_count >= *lower_bound => true,
Times::AtLeast(_) => false,
Times::AtMost(limit) if expectation.hit_count <= *limit => true,
Times::AtMost(_) => false,
Times::Between(range)
if expectation.hit_count <= *range.end()
&& expectation.hit_count >= *range.start() =>
{
true
}
Times::Between(_) => false,
Times::Exactly(limit) if expectation.hit_count == *limit => true,
Times::Exactly(_) => false,
};
if !is_valid_cardinality {
panic!(format!(
"Unexpected number of requests for matcher '{:?}'; received {}; expected {:?}",
&expectation.matcher, expectation.hit_count, &expectation.cardinality,
));
}
}
state.expected.clear();
if state.unexpected_requests != 0 {
panic!("{} unexpected requests received", state.unexpected_requests);
}
}
}
impl Drop for Server {
fn drop(&mut self) {
self.trigger_shutdown = None;
let _ = self.join_handle.take().unwrap().join();
self.verify_and_clear();
}
}
async fn on_req(state: ServerState, req: FullRequest) -> http::Response<hyper::Body> {
let response_future = {
let mut state = state.lock();
let mut iter = state.expected.iter_mut().rev();
let response_future = loop {
let expectation = match iter.next() {
None => break None,
Some(expectation) => expectation,
};
if expectation.matcher.matches(&req) {
log::debug!("found matcher: {:?}", &expectation.matcher);
expectation.hit_count += 1;
let is_valid_cardinality = match &expectation.cardinality {
Times::AnyNumber => true,
Times::AtLeast(_) => true,
Times::AtMost(limit) if expectation.hit_count <= *limit => true,
Times::AtMost(_) => false,
Times::Between(range) if expectation.hit_count <= *range.end() => true,
Times::Between(_) => false,
Times::Exactly(limit) if expectation.hit_count <= *limit => true,
Times::Exactly(_) => false,
};
if is_valid_cardinality {
break Some(expectation.responder.respond());
} else {
break Some(Box::pin(cardinality_error(
&*expectation.matcher as &dyn Matcher<FullRequest>,
&expectation.cardinality,
expectation.hit_count,
)));
}
}
};
if response_future.is_none() {
log::debug!("no matcher found for request: {:?}", req);
state.unexpected_requests += 1;
}
response_future
};
if let Some(f) = response_future {
f.await
} else {
http::Response::builder()
.status(hyper::StatusCode::INTERNAL_SERVER_ERROR)
.body(hyper::Body::from("No matcher found"))
.unwrap()
}
}
#[derive(Debug, Clone)]
pub enum Times {
AnyNumber,
AtLeast(usize),
AtMost(usize),
Between(std::ops::RangeInclusive<usize>),
Exactly(usize),
}
pub struct Expectation {
matcher: Box<dyn Matcher<FullRequest>>,
cardinality: Times,
responder: Box<dyn Responder>,
hit_count: usize,
}
impl Expectation {
pub fn matching(matcher: impl Matcher<FullRequest> + 'static) -> ExpectationBuilder {
ExpectationBuilder {
matcher: Box::new(matcher),
cardinality: Times::Exactly(1),
}
}
}
pub struct ExpectationBuilder {
matcher: Box<dyn Matcher<FullRequest>>,
cardinality: Times,
}
impl ExpectationBuilder {
pub fn times(self, cardinality: Times) -> ExpectationBuilder {
ExpectationBuilder {
cardinality,
..self
}
}
pub fn respond_with(self, responder: impl Responder + 'static) -> Expectation {
Expectation {
matcher: self.matcher,
cardinality: self.cardinality,
responder: Box::new(responder),
hit_count: 0,
}
}
}
#[derive(Clone)]
struct ServerState(Arc<Mutex<ServerStateInner>>);
impl ServerState {
fn lock(&self) -> std::sync::MutexGuard<ServerStateInner> {
self.0.lock().expect("mutex poisoned")
}
fn push_expectation(&self, expectation: Expectation) {
let mut inner = self.lock();
inner.expected.push(expectation);
}
}
impl Default for ServerState {
fn default() -> Self {
ServerState(Default::default())
}
}
struct ServerStateInner {
unexpected_requests: usize,
expected: Vec<Expectation>,
}
impl Default for ServerStateInner {
fn default() -> Self {
ServerStateInner {
unexpected_requests: Default::default(),
expected: Default::default(),
}
}
}
fn cardinality_error(
matcher: &dyn Matcher<FullRequest>,
cardinality: &Times,
hit_count: usize,
) -> Pin<Box<dyn Future<Output = http::Response<hyper::Body>> + Send + 'static>> {
let body = hyper::Body::from(format!(
"Unexpected number of requests for matcher '{:?}'; received {}; expected {:?}",
matcher, hit_count, cardinality,
));
Box::pin(async move {
http::Response::builder()
.status(hyper::StatusCode::INTERNAL_SERVER_ERROR)
.body(body)
.unwrap()
})
}