tweak to use serde for message json serialization

src/main.rs

@@ -148,7 +148,7 @@ impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for WsChatSession {
                         "/join" => {
                             if v.len() == 2 {
                                 self.room = v[1].to_owned();
-                                self.addr.do_send(server::Join {
+                                self.addr.do_send(server::ChatMessage::Join {
                                     id: self.id,
                                     name: self.room.clone(),
                                 });
@@ -174,7 +174,7 @@ impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for WsChatSession {
                         m.to_owned()
                     };
                     // send message to chat server
-                    self.addr.do_send(server::ClientMessage {
+                    self.addr.do_send(server::ChatMessage::ClientMessage {
                         id: self.id,
                         msg,
                         room: self.room.clone(),

src/server/mod.rs

@@ -1,10 +1,10 @@
-
 //! `ChatServer` is an actor. It maintains list of connection client session.
 //! And manages available rooms. Peers send messages to other peers in same
 //! room through `ChatServer`.
 
 use actix::prelude::*;
 use rand::{self, rngs::ThreadRng, Rng};
+use serde::*;
 use std::collections::{HashMap, HashSet};
 
 /// Chat server sends this messages to session
@@ -29,33 +29,32 @@ pub struct Disconnect {
 }
 
 /// Send message to specific room
-#[derive(Message)]
+#[derive(Message, Serialize, Deserialize)]
 #[rtype(result = "()")]
-pub struct ClientMessage {
-    /// Id of the client session
-    pub id: usize,
-    /// Peer message
-    pub msg: String,
-    /// Room name
-    pub room: String,
+#[serde(tag = "type")]
+pub enum ChatMessage {
+    ClientMessage {
+        /// Id of the client session
+        id: usize,
+        /// Peer message
+        msg: String,
+        /// Room name
+        room: String,
+    },
+    Join {
+        /// Client id
+        id: usize,
+        /// Room name
+        name: String,
+    },
 }
 
 /// List of available rooms
+#[derive(Message)]
+#[rtype(result = "Vec<String>")]
 pub struct ListRooms;
 
-impl actix::Message for ListRooms {
-    type Result = Vec<String>;
-}
-
 /// Join room, if room does not exists create new one.
-#[derive(Message)]
-#[rtype(result = "()")]
-pub struct Join {
-    /// Client id
-    pub id: usize,
-    /// Room name
-    pub name: String,
-}
 
 /// `ChatServer` manages chat rooms and responsible for coordinating chat
 /// session. implementation is super primitive
@@ -154,11 +153,36 @@ impl Handler<Disconnect> for ChatServer {
 }
 
 /// Handler for Message message.
-impl Handler<ClientMessage> for ChatServer {
+impl Handler<ChatMessage> for ChatServer {
     type Result = ();
 
-    fn handle(&mut self, msg: ClientMessage, _: &mut Context<Self>) {
-        self.send_message(&msg.room, msg.msg.as_str(), msg.id);
+    fn handle(&mut self, msg: ChatMessage, _: &mut Context<Self>) {
+        match msg {
+            ChatMessage::ClientMessage { room, msg, id } => {
+                self.send_message(&room, msg.as_str(), id)
+            }
+            ChatMessage::Join { id, name } => {
+                let mut rooms = Vec::new();
+
+                // remove session from all rooms
+                for (n, sessions) in &mut self.rooms {
+                    if sessions.remove(&id) {
+                        rooms.push(n.to_owned());
+                    }
+                }
+                // send message to other users
+                for room in rooms {
+                    self.send_message(&room, "Someone disconnected", 0);
+                }
+
+                self.rooms
+                    .entry(name.clone())
+                    .or_insert(HashSet::new())
+                    .insert(id);
+
+                self.send_message(&name, "Someone connected", id);
+            }
+        }
     }
 }
 
@@ -176,32 +200,3 @@ impl Handler<ListRooms> for ChatServer {
         MessageResult(rooms)
     }
 }
-
-/// Join room, send disconnect message to old room
-/// send join message to new room
-impl Handler<Join> for ChatServer {
-    type Result = ();
-
-    fn handle(&mut self, msg: Join, _: &mut Context<Self>) {
-        let Join { id, name } = msg;
-        let mut rooms = Vec::new();
-
-        // remove session from all rooms
-        for (n, sessions) in &mut self.rooms {
-            if sessions.remove(&id) {
-                rooms.push(n.to_owned());
-            }
-        }
-        // send message to other users
-        for room in rooms {
-            self.send_message(&room, "Someone disconnected", 0);
-        }
-
-        self.rooms
-            .entry(name.clone())
-            .or_insert(HashSet::new())
-            .insert(id);
-
-        self.send_message(&name, "Someone connected", id);
-    }
-}