lemmy/server/src/websocket/server.rs

487 lines
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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};
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use serde_json::{Value};
use std::str::FromStr;
use failure::Error;
use std::time::{SystemTime};
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use api::*;
use api::user::*;
use api::community::*;
use api::post::*;
use api::comment::*;
use api::site::*;
const RATE_LIMIT_MESSAGES: i32 = 30;
const RATE_LIMIT_PER_SECOND: i32 = 60;
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const RATE_LIMIT_REGISTER_MESSAGES: i32 = 3;
const RATE_LIMIT_REGISTER_PER_SECOND: i32 = 60*3;
/// 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>,
pub ip: String,
}
/// Session is disconnected
#[derive(Message)]
pub struct Disconnect {
pub id: usize,
pub ip: String,
}
/// 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,
}
#[derive(Serialize, Deserialize)]
pub struct StandardMessage {
/// Id of the client session
pub id: usize,
/// Peer message
pub msg: String,
}
impl actix::Message for StandardMessage {
type Result = String;
}
#[derive(Debug)]
pub struct RateLimitBucket {
last_checked: SystemTime,
allowance: f64
}
pub struct SessionInfo {
pub addr: Recipient<WSMessage>,
pub ip: String,
}
/// `ChatServer` manages chat rooms and responsible for coordinating chat
/// session. implementation is super primitive
pub struct ChatServer {
sessions: HashMap<usize, SessionInfo>, // A map from generated random ID to session addr
rate_limits: HashMap<String, RateLimitBucket>,
rooms: HashMap<i32, HashSet<usize>>, // A map from room / post name to set of connectionIDs
rng: ThreadRng,
}
impl Default for ChatServer {
fn default() -> ChatServer {
// default room
let rooms = HashMap::new();
ChatServer {
sessions: HashMap::new(),
rate_limits: HashMap::new(),
rooms: rooms,
rng: rand::thread_rng(),
}
}
}
impl ChatServer {
/// Send message to all users in the room
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fn send_room_message(&self, room: &i32, message: &str, skip_id: usize) {
if let Some(sessions) = self.rooms.get(room) {
for id in sessions {
if *id != skip_id {
if let Some(info) = self.sessions.get(id) {
let _ = info.addr.do_send(WSMessage(message.to_owned()));
}
}
}
}
}
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fn join_room(&mut self, room_id: i32, id: usize) {
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// remove session from all rooms
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for (_n, mut sessions) in &mut self.rooms {
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sessions.remove(&id);
}
// If the room doesn't exist yet
if self.rooms.get_mut(&room_id).is_none() {
self.rooms.insert(room_id, HashSet::new());
}
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&self.rooms.get_mut(&room_id).unwrap().insert(id);
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}
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fn send_community_message(&self, community_id: &i32, message: &str, skip_id: usize) -> Result<(), Error> {
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use db::*;
use db::post_view::*;
let conn = establish_connection();
let posts = PostView::list(&conn,
PostListingType::Community,
&SortType::New,
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Some(*community_id),
None,
None,
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None,
false,
false,
None,
Some(9999))?;
for post in posts {
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self.send_room_message(&post.id, message, skip_id);
}
Ok(())
}
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fn check_rate_limit_register(&mut self, id: usize) -> Result<(), Error> {
self.check_rate_limit_full(id, RATE_LIMIT_REGISTER_MESSAGES, RATE_LIMIT_REGISTER_PER_SECOND)
}
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fn check_rate_limit(&mut self, id: usize) -> Result<(), Error> {
self.check_rate_limit_full(id, RATE_LIMIT_MESSAGES, RATE_LIMIT_PER_SECOND)
}
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fn check_rate_limit_full(&mut self, id: usize, rate: i32, per: i32) -> Result<(), Error> {
if let Some(info) = self.sessions.get(&id) {
if let Some(rate_limit) = self.rate_limits.get_mut(&info.ip) {
// The initial value
if rate_limit.allowance == -2f64 {
rate_limit.allowance = rate as f64;
};
let current = SystemTime::now();
let time_passed = current.duration_since(rate_limit.last_checked)?.as_secs() as f64;
rate_limit.last_checked = current;
rate_limit.allowance += time_passed * (rate as f64 / per as f64);
if rate_limit.allowance > rate as f64 {
rate_limit.allowance = rate as f64;
}
if rate_limit.allowance < 1.0 {
println!("Rate limited IP: {}, time_passed: {}, allowance: {}", &info.ip, time_passed, rate_limit.allowance);
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Err(APIError {
op: "Rate Limit".to_string(),
message: format!("Too many requests. {} per {} seconds", rate, per),
})?
} else {
rate_limit.allowance -= 1.0;
Ok(())
}
} else {
Ok(())
}
} else {
Ok(())
}
}
}
/// 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, _ctx: &mut Context<Self>) -> Self::Result {
// 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>();
println!("{} joined", &msg.ip);
self.sessions.insert(id, SessionInfo {
addr: msg.addr,
ip: msg.ip.to_owned(),
});
if self.rate_limits.get(&msg.ip).is_none() {
self.rate_limits.insert(msg.ip, RateLimitBucket {
last_checked: SystemTime::now(),
allowance: -2f64,
});
}
// for (k,v) in &self.rate_limits {
// println!("{}: {:?}", k,v);
// }
// 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>) {
// let mut rooms: Vec<i32> = Vec::new();
// remove address
if self.sessions.remove(&msg.id).is_some() {
// remove session from all rooms
for (_id, sessions) in &mut self.rooms {
if sessions.remove(&msg.id) {
// rooms.push(*id);
}
}
}
}
}
/// Handler for Message message.
impl Handler<StandardMessage> for ChatServer {
type Result = MessageResult<StandardMessage>;
fn handle(&mut self, msg: StandardMessage, _: &mut Context<Self>) -> Self::Result {
let msg_out = match parse_json_message(self, msg) {
Ok(m) => m,
Err(e) => e.to_string()
};
MessageResult(msg_out)
}
}
fn parse_json_message(chat: &mut ChatServer, msg: StandardMessage) -> Result<String, Error> {
let json: Value = serde_json::from_str(&msg.msg)?;
let data = &json["data"].to_string();
let op = &json["op"].as_str().unwrap();
let user_operation: UserOperation = UserOperation::from_str(&op)?;
match user_operation {
UserOperation::Login => {
let login: Login = serde_json::from_str(data)?;
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let res = Oper::new(user_operation, login).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::Register => {
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chat.check_rate_limit_register(msg.id)?;
let register: Register = serde_json::from_str(data)?;
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let res = Oper::new(user_operation, register).perform()?;
Ok(serde_json::to_string(&res)?)
},
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UserOperation::GetUserDetails => {
let get_user_details: GetUserDetails = serde_json::from_str(data)?;
let res = Oper::new(user_operation, get_user_details).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::AddAdmin => {
let add_admin: AddAdmin = serde_json::from_str(data)?;
let res = Oper::new(user_operation, add_admin).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::BanUser => {
let ban_user: BanUser = serde_json::from_str(data)?;
let res = Oper::new(user_operation, ban_user).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::GetReplies => {
let get_replies: GetReplies = serde_json::from_str(data)?;
let res = Oper::new(user_operation, get_replies).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::MarkAllAsRead => {
let mark_all_as_read: MarkAllAsRead = serde_json::from_str(data)?;
let res = Oper::new(user_operation, mark_all_as_read).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::GetCommunity => {
let get_community: GetCommunity = serde_json::from_str(data)?;
let res = Oper::new(user_operation, get_community).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::ListCommunities => {
let list_communities: ListCommunities = serde_json::from_str(data)?;
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let res = Oper::new(user_operation, list_communities).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::CreateCommunity => {
chat.check_rate_limit_register(msg.id)?;
let create_community: CreateCommunity = serde_json::from_str(data)?;
let res = Oper::new(user_operation, create_community).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::EditCommunity => {
let edit_community: EditCommunity = serde_json::from_str(data)?;
let res = Oper::new(user_operation, edit_community).perform()?;
let mut community_sent: CommunityResponse = res.clone();
community_sent.community.user_id = None;
community_sent.community.subscribed = None;
let community_sent_str = serde_json::to_string(&community_sent)?;
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chat.send_community_message(&community_sent.community.id, &community_sent_str, msg.id)?;
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Ok(serde_json::to_string(&res)?)
},
UserOperation::FollowCommunity => {
let follow_community: FollowCommunity = serde_json::from_str(data)?;
let res = Oper::new(user_operation, follow_community).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::GetFollowedCommunities => {
let followed_communities: GetFollowedCommunities = serde_json::from_str(data)?;
let res = Oper::new(user_operation, followed_communities).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::BanFromCommunity => {
let ban_from_community: BanFromCommunity = serde_json::from_str(data)?;
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let community_id = ban_from_community.community_id;
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let res = Oper::new(user_operation, ban_from_community).perform()?;
let res_str = serde_json::to_string(&res)?;
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chat.send_community_message(&community_id, &res_str, msg.id)?;
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Ok(res_str)
},
UserOperation::AddModToCommunity => {
let mod_add_to_community: AddModToCommunity = serde_json::from_str(data)?;
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let community_id = mod_add_to_community.community_id;
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let res = Oper::new(user_operation, mod_add_to_community).perform()?;
let res_str = serde_json::to_string(&res)?;
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chat.send_community_message(&community_id, &res_str, msg.id)?;
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Ok(res_str)
},
UserOperation::ListCategories => {
let list_categories: ListCategories = ListCategories;
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let res = Oper::new(user_operation, list_categories).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::CreatePost => {
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chat.check_rate_limit_register(msg.id)?;
let create_post: CreatePost = serde_json::from_str(data)?;
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let res = Oper::new(user_operation, create_post).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::GetPost => {
let get_post: GetPost = serde_json::from_str(data)?;
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chat.join_room(get_post.id, msg.id);
let res = Oper::new(user_operation, get_post).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::GetPosts => {
let get_posts: GetPosts = serde_json::from_str(data)?;
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let res = Oper::new(user_operation, get_posts).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::CreatePostLike => {
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chat.check_rate_limit(msg.id)?;
let create_post_like: CreatePostLike = serde_json::from_str(data)?;
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let res = Oper::new(user_operation, create_post_like).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::EditPost => {
let edit_post: EditPost = serde_json::from_str(data)?;
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let res = Oper::new(user_operation, edit_post).perform()?;
let mut post_sent = res.clone();
post_sent.post.my_vote = None;
let post_sent_str = serde_json::to_string(&post_sent)?;
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chat.send_room_message(&post_sent.post.id, &post_sent_str, msg.id);
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Ok(serde_json::to_string(&res)?)
},
UserOperation::SavePost => {
let save_post: SavePost = serde_json::from_str(data)?;
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let res = Oper::new(user_operation, save_post).perform()?;
Ok(serde_json::to_string(&res)?)
},
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UserOperation::CreateComment => {
chat.check_rate_limit(msg.id)?;
let create_comment: CreateComment = serde_json::from_str(data)?;
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let post_id = create_comment.post_id;
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let res = Oper::new(user_operation, create_comment).perform()?;
let mut comment_sent = res.clone();
comment_sent.comment.my_vote = None;
comment_sent.comment.user_id = None;
let comment_sent_str = serde_json::to_string(&comment_sent)?;
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chat.send_room_message(&post_id, &comment_sent_str, msg.id);
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Ok(serde_json::to_string(&res)?)
},
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UserOperation::EditComment => {
let edit_comment: EditComment = serde_json::from_str(data)?;
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let post_id = edit_comment.post_id;
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let res = Oper::new(user_operation, edit_comment).perform()?;
let mut comment_sent = res.clone();
comment_sent.comment.my_vote = None;
comment_sent.comment.user_id = None;
let comment_sent_str = serde_json::to_string(&comment_sent)?;
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chat.send_room_message(&post_id, &comment_sent_str, msg.id);
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Ok(serde_json::to_string(&res)?)
},
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UserOperation::SaveComment => {
let save_comment: SaveComment = serde_json::from_str(data)?;
let res = Oper::new(user_operation, save_comment).perform()?;
Ok(serde_json::to_string(&res)?)
},
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UserOperation::CreateCommentLike => {
chat.check_rate_limit(msg.id)?;
let create_comment_like: CreateCommentLike = serde_json::from_str(data)?;
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let post_id = create_comment_like.post_id;
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let res = Oper::new(user_operation, create_comment_like).perform()?;
let mut comment_sent = res.clone();
comment_sent.comment.my_vote = None;
comment_sent.comment.user_id = None;
let comment_sent_str = serde_json::to_string(&comment_sent)?;
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chat.send_room_message(&post_id, &comment_sent_str, msg.id);
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Ok(serde_json::to_string(&res)?)
},
UserOperation::GetModlog => {
let get_modlog: GetModlog = serde_json::from_str(data)?;
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let res = Oper::new(user_operation, get_modlog).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::CreateSite => {
let create_site: CreateSite = serde_json::from_str(data)?;
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let res = Oper::new(user_operation, create_site).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::EditSite => {
let edit_site: EditSite = serde_json::from_str(data)?;
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let res = Oper::new(user_operation, edit_site).perform()?;
Ok(serde_json::to_string(&res)?)
},
UserOperation::GetSite => {
let get_site: GetSite = serde_json::from_str(data)?;
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let res = Oper::new(user_operation, get_site).perform()?;
Ok(serde_json::to_string(&res)?)
},
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UserOperation::Search => {
let search: Search = serde_json::from_str(data)?;
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let res = Oper::new(user_operation, search).perform()?;
Ok(serde_json::to_string(&res)?)
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},
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}
}