From 2cd0ea9a2e2691c6cdb3520e548beb938d959e8c Mon Sep 17 00:00:00 2001
From: Anton Patrushev <apatrushev@gmail.com>
Date: Wed, 20 Feb 2019 22:21:59 +0500
Subject: [PATCH 1/2] udp echo server example

---
 Cargo.toml           |  1 +
 udp-echo/Cargo.toml  | 11 +++++++++++
 udp-echo/README.md   | 18 +++++++++++++++++
 udp-echo/src/main.rs | 47 ++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 77 insertions(+)
 create mode 100644 udp-echo/Cargo.toml
 create mode 100644 udp-echo/README.md
 create mode 100644 udp-echo/src/main.rs

diff --git a/Cargo.toml b/Cargo.toml
index ae0b605e..12aa5a71 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,6 +30,7 @@ members = [
   "tls",
   "rustls",
   "unix-socket",
+  "udp-echo",
   "web-cors/backend",
   "websocket",
   "websocket-chat",
diff --git a/udp-echo/Cargo.toml b/udp-echo/Cargo.toml
new file mode 100644
index 00000000..8174deab
--- /dev/null
+++ b/udp-echo/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "udp-echo"
+version = "0.1.0"
+authors = ["Anton Patrushev <apatrushev@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+actix = "0.7"
+tokio = "*"
+futures = "*"
+bytes = "*"
diff --git a/udp-echo/README.md b/udp-echo/README.md
new file mode 100644
index 00000000..a72dd5da
--- /dev/null
+++ b/udp-echo/README.md
@@ -0,0 +1,18 @@
+# udp-echo
+
+## Usage
+
+### server
+
+```bash
+cd examples/udp-echo
+cargo run
+# Started http server: 127.0.0.1:12345
+```
+
+### socat client
+Copy port provided in server output and run following command to communicate
+with the udp server:
+```bash
+socat - UDP4:localhost:12345
+```
diff --git a/udp-echo/src/main.rs b/udp-echo/src/main.rs
new file mode 100644
index 00000000..c3406a5d
--- /dev/null
+++ b/udp-echo/src/main.rs
@@ -0,0 +1,47 @@
+extern crate actix;
+extern crate bytes;
+extern crate futures;
+extern crate tokio;
+
+use actix::{Actor, AsyncContext, Context, Message, StreamHandler};
+use bytes::BytesMut;
+use futures::stream::SplitSink;
+use futures::{Future, Sink, Stream};
+use std::net::SocketAddr;
+use tokio::codec::BytesCodec;
+use tokio::net::{UdpFramed, UdpSocket};
+
+struct UdpActor {
+    sink: SplitSink<UdpFramed<BytesCodec>>,
+}
+impl Actor for UdpActor {
+    type Context = Context<Self>;
+}
+
+#[derive(Message)]
+struct UdpPacket(BytesMut, SocketAddr);
+impl StreamHandler<UdpPacket, std::io::Error> for UdpActor {
+    fn handle(&mut self, msg: UdpPacket, _: &mut Context<Self>) {
+        println!("Received: ({:?}, {:?})", msg.0, msg.1);
+        (&mut self.sink).send((msg.0.into(), msg.1)).wait().unwrap();
+    }
+}
+
+fn main() {
+    let sys = actix::System::new("echo-udp");
+
+    let addr: SocketAddr = "127.0.0.1:0".parse().unwrap();
+    let sock = UdpSocket::bind(&addr).unwrap();
+    println!(
+        "Started udp server on: 127.0.0.1:{:?}",
+        sock.local_addr().unwrap().port()
+    );
+
+    let (sink, stream) = UdpFramed::new(sock, BytesCodec::new()).split();
+    UdpActor::create(|ctx| {
+        ctx.add_stream(stream.map(|(data, sender)| UdpPacket(data, sender)));
+        UdpActor { sink: sink }
+    });
+
+    std::process::exit(sys.run());
+}

From 0d45081fa09f6640511ced75651c47a2858953f0 Mon Sep 17 00:00:00 2001
From: Anton Patrushev <apatrushev@gmail.com>
Date: Fri, 22 Feb 2019 15:00:58 +0500
Subject: [PATCH 2/2] code review fixes

---
 .travis.yml          | 1 +
 Cargo.toml           | 2 +-
 udp-echo/Cargo.toml  | 6 +++---
 udp-echo/src/main.rs | 5 -----
 4 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 66f91d8b..24111b9d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -62,6 +62,7 @@ script:
       cd template_tera && cargo check && cd ..
       cd tls && cargo check && cd ..
       cd rustls && cargo check && cd ..
+      cd udp-echo && cargo check && cd ..
       cd unix-socket && cargo check && cd ..
       cd web-cors/backend && cargo check && cd ../..
       cd websocket && cargo check && cd ..
diff --git a/Cargo.toml b/Cargo.toml
index 12aa5a71..6a9b3e27 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,8 +29,8 @@ members = [
   "template_tera",
   "tls",
   "rustls",
-  "unix-socket",
   "udp-echo",
+  "unix-socket",
   "web-cors/backend",
   "websocket",
   "websocket-chat",
diff --git a/udp-echo/Cargo.toml b/udp-echo/Cargo.toml
index 8174deab..37da872e 100644
--- a/udp-echo/Cargo.toml
+++ b/udp-echo/Cargo.toml
@@ -6,6 +6,6 @@ edition = "2018"
 
 [dependencies]
 actix = "0.7"
-tokio = "*"
-futures = "*"
-bytes = "*"
+tokio = "0.1"
+futures = "0.1"
+bytes = "0.4"
diff --git a/udp-echo/src/main.rs b/udp-echo/src/main.rs
index c3406a5d..b926020b 100644
--- a/udp-echo/src/main.rs
+++ b/udp-echo/src/main.rs
@@ -1,8 +1,3 @@
-extern crate actix;
-extern crate bytes;
-extern crate futures;
-extern crate tokio;
-
 use actix::{Actor, AsyncContext, Context, Message, StreamHandler};
 use bytes::BytesMut;
 use futures::stream::SplitSink;