X-Git-Url: https://piware.de/gitweb/?p=learn-rust.git;a=blobdiff_plain;f=async-http%2Fsrc%2Fmain.rs;h=cf0b46de8e2995b0da941ce29f0609bf540571cb;hp=c36be0ad86d093e4619b1c3e41dfe474d4d5a073;hb=2a3abc5cfab55a80f35438d195a2151478aa4f93;hpb=5ae5a42b2644afab404f99b01503d6dd7d6a01b1

diff --git a/async-http/src/main.rs b/async-http/src/main.rs
index c36be0a..cf0b46d 100644
--- a/async-http/src/main.rs
+++ b/async-http/src/main.rs
@@ -1,29 +1,28 @@
 use std::fs;
-use std::io::prelude::*;
-use std::net::{ TcpListener, TcpStream };
 use std::time::Duration;
 
+use async_std::prelude::*;
+use async_std::net::{ TcpListener, TcpStream };
 use async_std::task;
+use futures::stream::StreamExt;
 
 #[async_std::main]
 async fn main() {
     env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();
 
     // Listen for incoming TCP connections on localhost port 7878
-    let listener = TcpListener::bind("127.0.0.1:7878").unwrap();
+    let listener = TcpListener::bind("127.0.0.1:7878").await.unwrap();
 
-    // Block forever, handling each request that arrives at this IP address
-    for stream in listener.incoming() {
-        let stream = stream.unwrap();
-        // not concurrent
-        handle_connection(stream).await;
-    }
+    listener.incoming().for_each_concurrent(/* limit */ None, |tcpstream| async move {
+        let tcpstream = tcpstream.unwrap();
+        handle_connection(tcpstream).await;
+    }).await;
 }
 
 async fn handle_connection(mut stream: TcpStream) {
     // Read the first 1024 bytes of data from the stream
     let mut buffer = [0; 1024];
-    assert!(stream.read(&mut buffer).unwrap() > 0);
+    assert!(stream.read(&mut buffer).await.unwrap() > 0);
 
     // Respond with greetings or a 404,
     // depending on the data in the request
@@ -31,6 +30,8 @@ async fn handle_connection(mut stream: TcpStream) {
         ("HTTP/1.1 200 OK", "index.html")
     } else if buffer.starts_with(b"GET /sleep HTTP/1.1\r\n") {
         task::sleep(Duration::from_secs(5)).await;
+        // sync version, to demonstrate concurrent async vs. parallel threads
+        // std::thread::sleep(Duration::from_secs(5));
         ("HTTP/1.1 201 Sleep", "index.html")
     } else {
         ("HTTP/1.1 404 NOT FOUND", "404.html")
@@ -41,6 +42,6 @@ async fn handle_connection(mut stream: TcpStream) {
     // Write response back to the stream,
     // and flush the stream to ensure the response is sent back to the client
     let response = format!("{status_line}\r\n\r\n{contents}");
-    stream.write_all(response.as_bytes()).unwrap();
-    stream.flush().unwrap();
+    stream.write_all(response.as_bytes()).await.unwrap();
+    stream.flush().await.unwrap();
 }