lemmy/server/src/websocket_server/server.rs

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Rust
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//! `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::{rngs::ThreadRng, Rng};
use std::collections::{HashMap, HashSet};
use serde::{Deserialize, Serialize};
use {Crud,establish_connection};
#[derive(EnumString,ToString,Debug)]
pub enum UserOperation {
Login, Register, Logout, Join, Edit, Reply, Vote, Delete, NextPage, Sticky
}
pub enum MessageType {
Comments, Users, Ping, Pong
}
/// Chat server sends this messages to session
#[derive(Message)]
pub struct WSMessage(pub String);
/// Message for chat server communications
/// New chat session is created
#[derive(Message)]
#[rtype(usize)]
pub struct Connect {
pub addr: Recipient<WSMessage>,
}
/// Session is disconnected
#[derive(Message)]
pub struct Disconnect {
pub id: usize,
}
/// Send message to specific room
#[derive(Message)]
pub struct ClientMessage {
/// Id of the client session
pub id: usize,
/// Peer message
pub msg: String,
/// Room name
pub room: String,
}
/// List of available rooms
pub struct ListRooms;
impl actix::Message for ListRooms {
type Result = Vec<String>;
}
/// Join room, if room does not exists create new one.
#[derive(Message)]
pub struct Join {
/// Client id
pub id: usize,
/// Room name
pub name: String,
}
#[derive(Message)]
#[derive(Serialize, Deserialize)]
pub struct Login {
pub username: String,
pub password: String
}
// #[derive(Message)]
#[derive(Serialize, Deserialize)]
pub struct Register {
username: String,
email: Option<String>,
password: String,
password_verify: String
}
impl actix::Message for Register {
type Result = String;
}
/// `ChatServer` manages chat rooms and responsible for coordinating chat
/// session. implementation is super primitive
pub struct ChatServer {
sessions: HashMap<usize, Recipient<WSMessage>>, // A map from generated random ID to session addr
rooms: HashMap<String, HashSet<usize>>, // A map from room name to set of connectionIDs
rng: ThreadRng,
}
impl Default for ChatServer {
fn default() -> ChatServer {
// default room
let mut rooms = HashMap::new();
rooms.insert("Main".to_owned(), HashSet::new());
ChatServer {
sessions: HashMap::new(),
rooms: rooms,
rng: rand::thread_rng(),
}
}
}
impl ChatServer {
/// Send message to all users in the room
fn send_room_message(&self, room: &str, message: &str, skip_id: usize) {
if let Some(sessions) = self.rooms.get(room) {
for id in sessions {
if *id != skip_id {
if let Some(addr) = self.sessions.get(id) {
let _ = addr.do_send(WSMessage(message.to_owned()));
}
}
}
}
}
}
/// Make actor from `ChatServer`
impl Actor for ChatServer {
/// We are going to use simple Context, we just need ability to communicate
/// with other actors.
type Context = Context<Self>;
}
/// Handler for Connect message.
///
/// Register new session and assign unique id to this session
impl Handler<Connect> for ChatServer {
type Result = usize;
fn handle(&mut self, msg: Connect, _: &mut Context<Self>) -> Self::Result {
println!("Someone joined");
// notify all users in same room
self.send_room_message(&"Main".to_owned(), "Someone joined", 0);
// register session with random id
let id = self.rng.gen::<usize>();
self.sessions.insert(id, msg.addr);
// auto join session to Main room
self.rooms.get_mut(&"Main".to_owned()).unwrap().insert(id);
// send id back
id
}
}
/// Handler for Disconnect message.
impl Handler<Disconnect> for ChatServer {
type Result = ();
fn handle(&mut self, msg: Disconnect, _: &mut Context<Self>) {
println!("Someone disconnected");
let mut rooms: Vec<String> = Vec::new();
// remove address
if self.sessions.remove(&msg.id).is_some() {
// remove session from all rooms
for (name, sessions) in &mut self.rooms {
if sessions.remove(&msg.id) {
rooms.push(name.to_owned());
}
}
}
// send message to other users
for room in rooms {
self.send_room_message(&room, "Someone disconnected", 0);
}
}
}
/// Handler for Message message.
impl Handler<ClientMessage> for ChatServer {
type Result = ();
fn handle(&mut self, msg: ClientMessage, _: &mut Context<Self>) {
self.send_room_message(&msg.room, msg.msg.as_str(), msg.id);
}
}
/// Handler for `ListRooms` message.
impl Handler<ListRooms> for ChatServer {
type Result = MessageResult<ListRooms>;
fn handle(&mut self, _: ListRooms, _: &mut Context<Self>) -> Self::Result {
let mut rooms = Vec::new();
for key in self.rooms.keys() {
rooms.push(key.to_owned())
}
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_room_message(&room, "Someone disconnected", 0);
}
if self.rooms.get_mut(&name).is_none() {
self.rooms.insert(name.clone(), HashSet::new());
}
self.send_room_message(&name, "Someone connected", id);
self.rooms.get_mut(&name).unwrap().insert(id);
}
}
impl Handler<Login> for ChatServer {
type Result = ();
fn handle(&mut self, msg: Login, _: &mut Context<Self>) {
println!("{}", msg.password);
}
}
impl Handler<Register> for ChatServer {
type Result = MessageResult<Register>;
fn handle(&mut self, msg: Register, _: &mut Context<Self>) -> Self::Result {
use actions::user::*;
let conn = establish_connection();
// TODO figure out how to return values, and throw errors
// Register the new user
let user_form = UserForm {
name: &msg.username,
email: msg.email.as_ref().map(|x| &**x),
password_encrypted: &msg.password,
preferred_username: None,
updated: None
};
let inserted_user = User_::create(&conn, user_form).unwrap();
// Return the jwt
MessageResult("hi".to_string())
}
}