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use merfolk::{interfaces::Backend, Call, Reply}; use anyhow::Result; use thiserror::Error; use hyper::{ client::{connect::dns::GaiResolver, HttpConnector}, Body, Client, Method, Request, StatusCode, }; use hyper::{ http::Uri, service::{make_service_fn, service_fn}, Response, Server, }; use std::{fmt::Debug, net::SocketAddr, sync::Arc}; use tokio::{runtime::Runtime, sync}; use log::{debug, info, trace}; #[derive(Debug, Error)] pub enum Error { #[error("serializing failed: {0}")] Serialize(#[source] serde_json::Error), #[error("deserializing failed {0}")] Deserialize(#[source] serde_json::Error), #[error("no speak provided in init()")] NoSpeak, #[error("error building request: {0}")] RequestBuilder(#[source] hyper::http::Error), #[error("error parsing body bytes: {0}")] ParseResponseBodyBytes(#[source] hyper::Error), #[error("error parsing body: {0}")] ParseResponseBody(#[from] std::string::FromUtf8Error), #[error("error while sending request: {0}")] ClientRequest(#[source] hyper::Error), #[error("request failed with statuscode {status}")] FailedRequest { status: StatusCode }, #[error("no listen provided in init()")] NoListen, #[error("no receiver was degistered by init()")] NoReceiver, #[error("error binding server: {0}")] BindServer(#[from] hyper::Error), #[error("no procedure header in request: {0}")] NoProcedureHeader(#[source] hyper::http::Error), #[error("could not create runtime: {0}")] RuntimeCreation(#[from] std::io::Error), #[error("already started")] AlreadyStarted, #[error("not started")] NotStarted, #[error("could not send stoping message")] Shutdown, } #[derive(derive_builder::Builder)] #[builder(pattern = "owned")] pub struct Http { #[builder(setter(into, strip_option, name = "speak_setter"), private, default = "None")] speak: Option<(Uri, Client<HttpConnector<GaiResolver>, Body>)>, #[builder(setter(into, strip_option), default = "None")] listen: Option<SocketAddr>, #[allow(clippy::type_complexity)] #[builder(private, default = "None")] receiver: Option<Arc<dyn Fn(Call<String>) -> Result<Reply<String>> + Send + Sync>>, #[builder(private, default = "Runtime::new().map_err(Error::RuntimeCreation).map_err(|e| e.to_string())?")] runtime: Runtime, #[builder(private, default = "None")] shutdown: Option<sync::oneshot::Sender<()>>, } impl HttpBuilder { pub fn speak(self, value: Uri) -> Self { self.speak_setter((value, Client::new())) } } impl Http { pub fn builder() -> HttpBuilder { HttpBuilder::default() } } impl Debug for Http { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::result::Result<(), std::fmt::Error> { f.debug_struct("Http") .field("speak", &self.speak) .field("listen", &self.listen) .field("runtime", &self.runtime) .finish() } } impl Http { pub fn start(&mut self) -> Result<()> { trace!("start Http Backend"); if self.shutdown.is_some() { return Err(Error::AlreadyStarted.into()); } let (tx, rx) = tokio::sync::oneshot::channel::<()>(); self.shutdown = Some(tx); let listen = self.listen.ok_or(Error::NoListen)?; let receiver = Arc::clone(self.receiver.as_ref().ok_or(Error::NoReceiver)?); self.runtime.spawn(async move { trace!("spawn listener"); let receiver = receiver.clone(); Server::bind(&listen) .serve(make_service_fn(move |_| { trace!("serve connection"); let receiver = receiver.clone(); async move { Ok::<_, hyper::Error>(service_fn(move |request: Request<Body>| { trace!("run service_fn"); debug!("{:?}", &listen); info!("received incomming call"); let receiver = receiver.clone(); async move { let procedure = if let Some(procedure) = request.headers().get("Procedure") { match procedure.to_str() { Ok(procedure) => procedure.to_owned(), Err(e) => return Response::builder().status(StatusCode::BAD_REQUEST).body(Body::from(e.to_string())), } } else { return Response::builder().status(StatusCode::BAD_REQUEST).body(Body::from("No Procedure provided")); }; let body_bytes = match hyper::body::to_bytes(request.into_body()).await { Ok(body_bytes) => body_bytes, Err(e) => return Response::builder().status(StatusCode::BAD_REQUEST).body(Body::from(e.to_string())), }; let body = match String::from_utf8(body_bytes.to_vec()) { Ok(body) => body, Err(e) => return Response::builder().status(StatusCode::BAD_REQUEST).body(Body::from(e.to_string())), }; debug!("call Call {{ procedure: {:?}, payload: {:?} }}", &procedure, &body); let reply = receiver(crate::Call { procedure, payload: body }); match reply { Err(e) => Response::builder().status(StatusCode::BAD_REQUEST).body(Body::from(format!("{:?}", e))), Ok(reply) => { debug!("reply Reply {{ payload: {:?} }}", &reply.payload); Response::builder().status(StatusCode::OK).body(Body::from(reply.payload)) } } } })) } })) .with_graceful_shutdown(async { rx.await.ok(); }) .await .unwrap(); }); Ok(()) } pub fn stop(&mut self) -> Result<()> { trace!("stop http backend"); self.shutdown.take().ok_or(Error::NotStarted)?.send(()).map_err(|_| Error::Shutdown.into()) } } impl Backend for Http { type Intermediate = String; fn register<T>(&mut self, receiver: T) -> Result<()> where T: Fn(Call<Self::Intermediate>) -> Result<Reply<Self::Intermediate>> + Send + Sync + 'static, { trace!("register receiver"); self.receiver = Some(Arc::new(move |call: Call<String>| { trace!("run receiver"); debug!("calling receiver"); receiver(call) })); if let Some(err) = self.start().err().map(|e| e.downcast::<Error>()) { match err { Ok(err) => match err { Error::AlreadyStarted | Error::NoListen | Error::NoReceiver => {} err => return Err(err.into()), }, Err(err) => return Err(err), } }; Ok(()) } fn call(&mut self, call: Call<Self::Intermediate>) -> Result<Reply<Self::Intermediate>> { trace!("call backend"); debug!("{:?}", &self.speak); info!("received outgoing call"); match &self.speak { None => Err(Error::NoSpeak.into()), Some(speak) => self.runtime.block_on(async { let request = Request::builder() .method(Method::POST) .uri(&speak.0) .header("Procedure", &call.procedure) .body(Body::from(call.payload.clone())) .map_err(Error::RequestBuilder)?; debug!("request {:?}", &request); let response = speak.1.request(request).await.map_err(Error::ClientRequest)?; debug!("response {:?}", &response); let status = response.status(); let body_bytes = hyper::body::to_bytes(response.into_body()).await.map_err(Error::ParseResponseBodyBytes)?; let body = String::from_utf8(body_bytes.to_vec()).map_err(Error::ParseResponseBody)?; match status { StatusCode::OK => Ok(Reply { payload: body }), _ => Err(Error::FailedRequest { status }.into()), } }), } } fn serialize<T: serde::Serialize>(from: &T) -> Result<String> { trace!("serialize from"); serde_json::to_string(from).map_err(|e| Error::Serialize(e).into()) } fn deserialize<'b, T>(from: &'b Self::Intermediate) -> Result<T> where T: for<'de> serde::Deserialize<'de>, { trace!("deserialize from"); serde_json::from_str(&from).map_err(|e| Error::Deserialize(e).into()) } } impl Drop for Http { fn drop(&mut self) { if self.shutdown.is_some() { self.stop().unwrap() } } }