send/receive Arc<Event> instead of Event so we don't have to clone objects all over the place. This might also enable us to be a bit more flexible with what we send with Events, and might simplify things elsewhere.

src/event/mod.rs

@@ -1,6 +1,5 @@
 use {Channel, User};
 
-#[derive(Clone)]
 pub enum Event {
     Message { sender: User, channel: Option<Channel>, content: String },
     Join { channel: Channel },

src/lib.rs

@@ -54,7 +54,7 @@ impl Tenquestionmarks {
             // Module event consumer threads.
             // tenquestionmarks propagates all events to each Module through these
             // channels.
-            let senders: Vec<Sender<Event>> = self.modules.values().map(|module| {
+            let senders: Vec<Sender<Arc<Event>>> = self.modules.values().map(|module| {
                 let (sender, receiver) = mpsc::channel();
                 scope.spawn(move || module.consume_events(receiver));
                 sender
@@ -88,12 +88,11 @@ impl Tenquestionmarks {
     }
 }
 
-#[derive(Clone)]
 pub struct Channel {
     name: String,
     description: String,
     topic: String,
-    sender: Arc<MessageSender>
+    sender: Box<MessageSender>
 }
 
 impl Channel {
@@ -102,10 +101,9 @@ impl Channel {
     }
 }
 
-#[derive(Clone)]
 pub struct User {
     name: String,
-    sender: Arc<MessageSender>
+    sender: Box<MessageSender>
 }
 
 impl User {

src/modules/discord.rs

@@ -54,7 +54,7 @@ impl MessageSender for DiscordMessageSender {
 }
 
 impl Module for DiscordModule {
-    fn produce_events<'a>(&'a self, sender: Sender<event::Event>) {
+    fn produce_events<'a>(&'a self, sender: Sender<Arc<event::Event>>) {
         let discord = Arc::new(Discord::from_bot_token(&self.token[..]).expect("Discord module: Login failed"));
         let (mut connection, _) = discord.connect().expect("Discord module: Connection failed");
 
@@ -66,7 +66,7 @@ impl Module for DiscordModule {
                 Ok(Event::MessageCreate(message)) => {
                     let author = User {
                         name: message.author.name.clone(),
-                        sender: Arc::new(DiscordMessageSender {
+                        sender: Box::new(DiscordMessageSender {
                             discord: discord.clone(),
                             channel_id: message.channel_id
                         })
@@ -76,13 +76,13 @@ impl Module for DiscordModule {
                         name: String::from("channel"),
                         description: String::from(""),
                         topic: String::from(""),
-                        sender: Arc::new(DiscordMessageSender {
+                        sender: Box::new(DiscordMessageSender {
                             discord: discord.clone(),
                             channel_id: message.channel_id
                         })
                     };
 
-                    match sender.send(event::Event::Message { sender: author, content: message.content, channel: Option::Some(channel) }) {
+                    match sender.send(Arc::new(event::Event::Message { sender: author, content: message.content, channel: Option::Some(channel) })) {
                         Err(err) => error!("Error sending message event: {:?}", err),
                         Ok(_) => {}
                     }

src/modules/echo.rs

@@ -1,6 +1,7 @@
 use modules::Module;
 use toml::Table;
 
+use std::sync::Arc;
 use std::sync::mpsc::Receiver;
 use event::Event;
 
@@ -21,17 +22,17 @@ impl EchoModule {
 }
 
 impl Module for EchoModule {
-    fn consume_events (&self, receiver: Receiver<Event>) {
+    fn consume_events (&self, receiver: Receiver<Arc<Event>>) {
         loop {
             match receiver.recv() {
                 Ok(event) => {
-                    match event {
-                        Event::Message { content: message, channel, sender } => {
+                    match *event {
+                        Event::Message { content: ref message, ref channel, ref sender } => {
                             debug!("Received message... {:?}", message);
                             if message.starts_with(self.prefix.as_str()) {
                                 let substring = &message[self.prefix.chars().count()..];
-                                match channel {
-                                    Some(channel) => channel.send(substring),
+                                match *channel {
+                                    Some(ref channel) => channel.send(substring),
                                     None => sender.send(substring)
                                 }
                             }

src/modules/mod.rs

@@ -9,10 +9,11 @@ pub mod loader;
 use Tenquestionmarks;
 use event::Event;
 
+use std::sync::Arc;
 use std::sync::mpsc::{Sender, Receiver};
 
 pub trait Module : Sync {
     fn register (&self, tenquestionmarks: &Tenquestionmarks) {}
-    fn consume_events (&self, receiver: Receiver<Event>) {}
-    fn produce_events<'a>(&'a self, sender: Sender<Event>) {}
+    fn consume_events (&self, receiver: Receiver<Arc<Event>>) {}
+    fn produce_events<'a>(&'a self, sender: Sender<Arc<Event>>) {}
 }

src/modules/random.rs

@@ -1,6 +1,7 @@
 use modules::Module;
 use toml::Table;
 
+use std::sync::Arc;
 use std::sync::mpsc::Receiver;
 use event::Event;
 
@@ -33,20 +34,20 @@ impl RandomModule {
 }
 
 impl Module for RandomModule {
-    fn consume_events (&self, receiver: Receiver<Event>) {
+    fn consume_events (&self, receiver: Receiver<Arc<Event>>) {
         let mut rng = rand::thread_rng();
 
         loop {
             match receiver.recv() {
                 Ok(event) => {
-                    match event {
-                        Event::Message { content: message, channel, sender } => {
+                    match *event {
+                        Event::Message { content: ref message, ref channel, ref sender } => {
                             debug!("Received message... {:?}", message);
                             if message.starts_with(self.prefix.as_str()) {
                                 let response = &rand::sample(&mut rng, &self.responses, 1)[0][..];
 
-                                match channel {
-                                    Some(channel) => channel.send(response),
+                                match *channel {
+                                    Some(ref channel) => channel.send(response),
                                     None => sender.send(response)
                                 }
                             }

src/modules/stdin.rs

@@ -30,20 +30,23 @@ impl StdinModule {
 }
 
 impl Module for StdinModule {
-    fn produce_events<'a>(&'a self, sender: Sender<Event>) {
-        let user = User {
-            name: String::from("Dave"),
-            sender: Arc::new(StdinMessageSender {
-                name: String::from("Dave")
-            })
-        };
-
+    fn produce_events<'a>(&'a self, sender: Sender<Arc<Event>>) {
         loop {
             let mut input = String::new();
             match io::stdin().read_line(&mut input) {
                 Ok(n) => {
-                    let message = Event::Message { sender: user.clone(), content: input, channel: None };
-                    match sender.send(message) {
+                    let message = Event::Message {
+                        sender: User {
+                            name: String::from("Dave"),
+                            sender: Box::new(StdinMessageSender {
+                                name: String::from("Dave")
+                            })
+                        },
+                        content: input,
+                        channel: None
+                    };
+
+                    match sender.send(Arc::new(message)) {
                         Err(err) => error!("Error sending message event: {:?}", err),
                         Ok(_) => {}
                     }