Add an echo server for testing (#21)

Cargo.toml

@@ -1,6 +1,6 @@
 [workspace]
 resolver = "2"
-members = ["ewebsock", "example_app"]
+members = ["ewebsock", "example_app", "echo_server"]
 
 [patch.crates-io]
 # If you want to use the bleeding edge version of egui/eframe:

README.md

@@ -21,13 +21,18 @@ while let Some(event) = receiver.try_recv() {
 ```
 
 ## Testing
-Locally:
+First start the example echo server with:
+```sh
+cargo r -p echo_server
+```
+
+Then test the native library with:
 
 ```sh
 cargo run -p example_app
 ```
 
-Web:
+And the web library with:
 ```sh
 ./example_app/start_server.sh &
 ./example_app/build_web.sh --open

echo_server/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "echo_server"
+version = "0.1.0"
+authors = ["Emil Ernerfeldt <emil.ernerfeldt@gmail.com>"]
+edition = "2021"
+rust-version = "1.56"
+license = "MIT OR Apache-2.0"
+include = ["../LICENSE-APACHE", "../LICENSE-MIT", "**/*.rs", "Cargo.toml"]
+publish = false
+
+
+[dependencies]
+tungstenite = "0.20"

echo_server/README.md

@@ -0,0 +1,3 @@
+A server you can use for testing - just echoes the input.
+
+`cargo r -p echo_server`

echo_server/src/main.rs

@@ -0,0 +1,22 @@
+use std::{net::TcpListener, thread::spawn};
+
+fn main() {
+    let bind_addr = "127.0.0.1:9001";
+    let server = TcpListener::bind(bind_addr).unwrap();
+    eprintln!("Listening on: ws://{bind_addr}");
+    for stream in server.incoming() {
+        spawn(move || {
+            let mut websocket = tungstenite::accept(stream.unwrap()).unwrap();
+            eprintln!("New client connected");
+            loop {
+                let msg = websocket.read().unwrap();
+
+                // We do not want to send back ping/pong messages.
+                if msg.is_binary() || msg.is_text() {
+                    websocket.send(msg).unwrap();
+                    eprintln!("Responded.");
+                }
+            }
+        });
+    }
+}

example_app/Cargo.toml

@@ -6,6 +6,7 @@ edition = "2021"
 rust-version = "1.56"
 license = "MIT OR Apache-2.0"
 include = ["../LICENSE-APACHE", "../LICENSE-MIT", "**/*.rs", "Cargo.toml"]
+publish = false
 
 
 [lib]

example_app/src/app.rs

@@ -1,13 +1,22 @@
 use eframe::egui;
 use ewebsock::{WsEvent, WsMessage, WsReceiver, WsSender};
 
-#[derive(Default)]
 pub struct ExampleApp {
     url: String,
     error: String,
     frontend: Option<FrontEnd>,
 }
 
+impl Default for ExampleApp {
+    fn default() -> Self {
+        Self {
+            url: "ws://127.0.0.1:9001".to_owned(),
+            error: Default::default(),
+            frontend: None,
+        }
+    }
+}
+
 impl eframe::App for ExampleApp {
     fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
         #[cfg(not(target_arch = "wasm32"))]