stubr 0.6.2

Wiremock implemented in Rust
Documentation 
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use std::net::SocketAddr;

use log::info;
use tokio::sync::mpsc::{channel, Sender};
use warp::{
    filters::{host::Authority, path::FullPath},
    http::HeaderMap,
    hyper::body::Bytes,
    Filter, Rejection, Reply,
};
use warp_reverse_proxy::{extract_request_data_filter, proxy_to_and_forward_response, Method, QueryParameters};

use super::{
    super::{config::RecordConfig, RecordInput, RecordedExchange},
    port::PortAllocator,
    warp_exchange::{WarpExchange, WarpRequest, WarpResponse},
};

pub struct Proxy;

impl Proxy {
    pub(crate) fn run(cfg: RecordConfig, then: fn(RecordInput)) -> (SocketAddr, Sender<String>) {
        let (tx, mut rx) = channel::<String>(1);
        let addr = PortAllocator::new_binding(cfg.port);
        let server = warp::serve(warp::any().and(Self::forward_and_record(cfg, then).boxed()));
        let (addr, server) = server.bind_with_graceful_shutdown(addr, async move {
            rx.recv().await;
        });
        tokio::spawn(async move {
            server.await;
        });
        info!("Started stubr recorder on {}", addr);
        (addr, tx)
    }

    fn forward_and_record(cfg: RecordConfig, then: fn(RecordInput)) -> impl Filter<Extract = (impl Reply,), Error = Rejection> {
        Self::host()
            .and(warp::any().map(String::new))
            .and(extract_request_data_filter())
            .and_then(Self::proxy)
            .and_then(move |exchange| Self::reply(exchange, cfg.clone(), then))
    }

    fn host() -> impl Filter<Extract = (String,), Error = Rejection> {
        warp::filters::host::optional().map(|authority: Option<Authority>| authority.map(Self::base_uri).unwrap_or_default())
    }

    fn base_uri(a: Authority) -> String {
        format!("http://{}:{}/", a.host(), a.port_u16().unwrap_or(80))
    }

    async fn proxy(
        addr: String, base_path: String, uri: FullPath, queries: QueryParameters, method: Method, headers: HeaderMap, body: Bytes,
    ) -> Result<RecordedExchange, Rejection> {
        let path = uri.as_str().to_string();
        let resp = proxy_to_and_forward_response(
            addr.clone(),
            base_path,
            uri,
            queries.clone(),
            method.clone(),
            headers.clone(),
            body.clone(),
        )
        .await?;
        let req = WarpRequest {
            method,
            addr,
            path,
            queries,
            headers,
            body,
        };
        let resp = WarpResponse(
            resp.status(),
            resp.headers().clone(),
            warp::hyper::body::to_bytes(resp.into_body()).await.unwrap(),
        );
        Ok(WarpExchange(req, resp).into())
    }

    async fn reply(mut exchange: RecordedExchange, cfg: RecordConfig, then: fn(RecordInput)) -> Result<impl Reply, Rejection> {
        then((&mut exchange, &cfg));
        Ok(exchange.1)
    }
}