feat: forward stream

Cargo.toml

@@ -8,9 +8,13 @@ edition = "2018"
 
 [dependencies]
 tokio = { version = "0.2", features = ["full"] }
-reqwest = "0.10"
+reqwest = { version = "0.10", features = ["stream"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-warp = "0.2"
 clap = "2.0"
-
+rust_util = "0.6"
+actix-http = "1.0"
+actix-web = "2"
+actix-rt = "1"
+bytes = "0.5"
+futures-core = "0.3"

src/main.rs

@@ -1,3 +1,92 @@
-fn main() {
-    println!("Hello, world!");
+#[macro_use]
+extern crate rust_util;
+
+use std::pin::Pin;
+use std::fmt::{ self, Display, Formatter };
+use std::error::Error;
+use std::task::{ Context, Poll };
+use bytes::Bytes;
+use clap::{ App, Arg };
+use actix_web::{ web, HttpServer, HttpRequest, HttpResponse };
+
+const DEFAULT_PORT: u16 = 8888;
+
+#[derive(Debug)]
+enum GetStreamError {
+    ReqwestError(reqwest::Error),
+}
+
+impl Display for GetStreamError {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        write!(f, "Unknown error!")
+    }
+}
+
+impl Error for GetStreamError {
+    fn cause(&self) -> Option<&dyn Error> {
+        None
+    }
+}
+
+impl From<reqwest::Error> for GetStreamError {
+    fn from(reqwest_error: reqwest::Error) -> Self {
+        GetStreamError::ReqwestError(reqwest_error)
+    }
+}
+
+impl From<GetStreamError> for actix_http::error::Error {
+    fn from(_: GetStreamError) -> Self { todo!() }
+}
+
+struct ProxyStream {
+    inner: Box<dyn futures_core::Stream<Item = reqwest::Result<Bytes>> + Unpin>,
+}
+
+impl futures_core::Stream for ProxyStream {
+    type Item = Result<Bytes, GetStreamError>;
+
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
+        match futures_core::Stream::poll_next(Pin::new(&mut (*self.inner)), cx) {
+            Poll::Ready(t) => Poll::Ready(t.map(|e| e.map_err(|e| e.into()))),
+            Poll::Pending => Poll::Pending,
+        }
+    }
+
+    #[inline]
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        futures_core::Stream::size_hint(&*self.inner)
+    }
+}
+
+async fn get_file(req: HttpRequest) -> HttpResponse {
+    println!("{:?}", req);
+    let resp = reqwest::get("http://example.com/").await.unwrap();
+    HttpResponse::Ok()
+        .content_type("text/plain")
+        .streaming(ProxyStream{ inner: Box::new(resp.bytes_stream()) })
+}
+
+#[actix_rt::main]
+async fn main() -> std::io::Result<()> {
+    let app = App::new(env!("CARGO_PKG_NAME"))
+        .version(env!("CARGO_PKG_VERSION"))
+        .about(env!("CARGO_PKG_DESCRIPTION"))
+        .arg(Arg::with_name("listen_wide").long("wide").short("w").help("Listen wide 0.0.0.0:port"))
+        .arg(Arg::with_name("listen_port").long("port").short("p").takes_value(true).help("Listen port"));
+
+    let matches = app.get_matches();
+    let is_listen_wide = matches.is_present("listen_wide");
+    let listen_port = matches.value_of("listen_port")
+        .map(|p| p.parse::<u16>().unwrap_or_else(|e| panic!(format!("Parse port: {}, error: {}", p, e))))
+        .unwrap_or_else(|| DEFAULT_PORT);
+    
+    let listen_addr = iff!(is_listen_wide, "0.0.0.0", "127.0.0.1");
+    information!("Listen at: {}:{}", listen_addr, listen_port);
+    
+    HttpServer::new(||
+        actix_web::App::new()
+        .service(web::resource("/get_file").to(get_file))
+    ).bind(format!("{}:{}", listen_addr, listen_port))?
+    .run()
+    .await
 }