Move HELO to actually come from the server

src/main.rs

@@ -2,9 +2,10 @@
 extern crate log;
 
 use anyhow::{Context, Error, Result};
+use future::ok;
 use futures::prelude::*;
-use net::{ClientMessage, ServerMessage};
-use serde_json::{from_str, Value};
+use net::{ClientMessage, Meta, ServerMessage};
+use serde_json::{from_str, json, to_string, Value};
 use std::net::ToSocketAddrs;
 use stream::{iter, FuturesUnordered};
 use structopt::StructOpt;
@@ -46,7 +47,31 @@ async fn main() -> Result<()> {
 }
 
 async fn handle_socket(websocket: WebSocket) {
-    let (_sink, mut source) = websocket.split();
+    let (sink, mut source) = websocket.split();
+
+    let mut sink = sink.with(|msg: ServerMessage<Vec<Value>, Value>| {
+        let json = to_string(&msg).expect("JSON encoding shouldn't fail");
+        ok::<Message, Error>(Message::text(json))
+    });
+
+    let mut greeting = iter(vec![
+        ServerMessage::Meta {
+            m: Meta {
+                version: "Unstable",
+                helo: Some("Dedicated base2020 server".into()),
+            },
+        },
+        ServerMessage::SetState {
+            u: 0,
+            s: json!({}),
+        },
+    ])
+    .map(Ok);
+
+    if let Err(err) = sink.send_all(&mut greeting).await {
+        warn!("Websocket send error: {:#}", err);
+        return;
+    }
 
     let error: Option<Error> = loop {
         match source.next().await {

src/net/Connection.ts

@@ -20,11 +20,6 @@ export class Connection<LocalInput, State> {
         const ws = new WebSocket(this.url);
 
         const source: Source<ServerMessage<LocalInput[], State>> = create((data, { }, close) => {
-            ws.onopen = () => {
-                // fake a HELO message & set state message until the server actually sends them
-                data({ t: MessageTypes.META, helo: "Websocket Server" });
-                data({ t: MessageTypes.SET_STATE, u: 0, s: {} });
-            };
             ws.onmessage = msg => {
                 const decoded: Jsonified<ServerMessage<LocalInput[], State>> = JSON.parse(msg.data);
                 data(decoded as ServerMessage<LocalInput[], State>);

src/net/mod.rs

@@ -13,15 +13,18 @@ pub enum ClientMessage<I, S> {
 
 #[derive(Serialize, Debug)]
 pub struct Meta {
-    helo: Option<String>,
-    version: &'static str,
+    pub helo: Option<String>,
+    pub version: &'static str,
 }
 
 #[derive(Serialize, Debug)]
 #[serde(tag = "t")]
 pub enum ServerMessage<I, S> {
     #[serde(rename = "m")]
-    Meta { m: Meta },
+    Meta {
+        #[serde(flatten)]
+        m: Meta,
+    },
     #[serde(rename = "s")]
     SetState { u: i8, s: S },
     #[serde(rename = "i")]