1 //! `ChatServer` is an actor. It maintains list of connection client session.
2 //! And manages available rooms. Peers send messages to other peers in same
3 //! room through `ChatServer`.
6 use diesel::r2d2::{ConnectionManager, Pool};
7 use diesel::PgConnection;
9 use rand::{rngs::ThreadRng, Rng};
10 use serde::{Deserialize, Serialize};
11 use serde_json::Value;
12 use std::collections::{HashMap, HashSet};
13 use std::str::FromStr;
14 use std::time::SystemTime;
16 use crate::api::comment::*;
17 use crate::api::community::*;
18 use crate::api::post::*;
19 use crate::api::site::*;
20 use crate::api::user::*;
22 use crate::websocket::UserOperation;
25 /// Chat server sends this messages to session
27 #[rtype(result = "()")]
28 pub struct WSMessage(pub String);
30 /// Message for chat server communications
32 /// New chat session is created
36 pub addr: Recipient<WSMessage>,
40 /// Session is disconnected
42 #[rtype(result = "()")]
43 pub struct Disconnect {
48 // TODO this is unused rn
49 /// Send message to specific room
51 #[rtype(result = "()")]
52 pub struct ClientMessage {
53 /// Id of the client session
61 #[derive(Serialize, Deserialize, Message)]
63 pub struct StandardMessage {
64 /// Id of the client session
71 pub struct RateLimitBucket {
72 last_checked: SystemTime,
76 pub struct SessionInfo {
77 pub addr: Recipient<WSMessage>,
81 /// `ChatServer` manages chat rooms and responsible for coordinating chat
82 /// session. implementation is super primitive
83 pub struct ChatServer {
84 sessions: HashMap<usize, SessionInfo>, // A map from generated random ID to session addr
85 rate_limits: HashMap<String, RateLimitBucket>,
86 rooms: HashMap<i32, HashSet<usize>>, // A map from room / post name to set of connectionIDs
88 db: Pool<ConnectionManager<PgConnection>>,
92 pub fn startup(db: Pool<ConnectionManager<PgConnection>>) -> ChatServer {
94 let rooms = HashMap::new();
97 sessions: HashMap::new(),
98 rate_limits: HashMap::new(),
100 rng: rand::thread_rng(),
105 /// Send message to all users in the room
106 fn send_room_message(&self, room: i32, message: &str, skip_id: usize) {
107 if let Some(sessions) = self.rooms.get(&room) {
110 if let Some(info) = self.sessions.get(id) {
111 let _ = info.addr.do_send(WSMessage(message.to_owned()));
118 fn join_room(&mut self, room_id: i32, id: usize) {
119 // remove session from all rooms
120 for sessions in self.rooms.values_mut() {
121 sessions.remove(&id);
124 // If the room doesn't exist yet
125 if self.rooms.get_mut(&room_id).is_none() {
126 self.rooms.insert(room_id, HashSet::new());
129 self.rooms.get_mut(&room_id).unwrap().insert(id);
132 fn send_community_message(
137 ) -> Result<(), Error> {
138 use crate::db::post_view::*;
141 let conn = self.db.get()?;
143 let posts = PostQueryBuilder::create(&conn)
144 .listing_type(ListingType::Community)
145 .sort(&SortType::New)
146 .for_community_id(community_id)
151 self.send_room_message(post.id, message, skip_id);
157 fn check_rate_limit_register(&mut self, id: usize) -> Result<(), Error> {
158 self.check_rate_limit_full(
160 Settings::get().rate_limit.register,
161 Settings::get().rate_limit.register_per_second,
165 fn check_rate_limit_post(&mut self, id: usize) -> Result<(), Error> {
166 self.check_rate_limit_full(
168 Settings::get().rate_limit.post,
169 Settings::get().rate_limit.post_per_second,
173 fn check_rate_limit_message(&mut self, id: usize) -> Result<(), Error> {
174 self.check_rate_limit_full(
176 Settings::get().rate_limit.message,
177 Settings::get().rate_limit.message_per_second,
181 #[allow(clippy::float_cmp)]
182 fn check_rate_limit_full(&mut self, id: usize, rate: i32, per: i32) -> Result<(), Error> {
183 if let Some(info) = self.sessions.get(&id) {
184 if let Some(rate_limit) = self.rate_limits.get_mut(&info.ip) {
186 if rate_limit.allowance == -2f64 {
187 rate_limit.allowance = rate as f64;
190 let current = SystemTime::now();
191 let time_passed = current.duration_since(rate_limit.last_checked)?.as_secs() as f64;
192 rate_limit.last_checked = current;
193 rate_limit.allowance += time_passed * (rate as f64 / per as f64);
194 if rate_limit.allowance > rate as f64 {
195 rate_limit.allowance = rate as f64;
198 if rate_limit.allowance < 1.0 {
200 "Rate limited IP: {}, time_passed: {}, allowance: {}",
201 &info.ip, time_passed, rate_limit.allowance
205 message: format!("Too many requests. {} per {} seconds", rate, per),
210 rate_limit.allowance -= 1.0;
222 /// Make actor from `ChatServer`
223 impl Actor for ChatServer {
224 /// We are going to use simple Context, we just need ability to communicate
225 /// with other actors.
226 type Context = Context<Self>;
229 /// Handler for Connect message.
231 /// Register new session and assign unique id to this session
232 impl Handler<Connect> for ChatServer {
235 fn handle(&mut self, msg: Connect, _ctx: &mut Context<Self>) -> Self::Result {
236 // notify all users in same room
237 // self.send_room_message(&"Main".to_owned(), "Someone joined", 0);
239 // register session with random id
240 let id = self.rng.gen::<usize>();
241 println!("{} joined", &msg.ip);
243 self.sessions.insert(
247 ip: msg.ip.to_owned(),
251 if self.rate_limits.get(&msg.ip).is_none() {
252 self.rate_limits.insert(
255 last_checked: SystemTime::now(),
265 /// Handler for Disconnect message.
266 impl Handler<Disconnect> for ChatServer {
269 fn handle(&mut self, msg: Disconnect, _: &mut Context<Self>) {
270 // let mut rooms: Vec<i32> = Vec::new();
273 if self.sessions.remove(&msg.id).is_some() {
274 // remove session from all rooms
275 for sessions in self.rooms.values_mut() {
276 if sessions.remove(&msg.id) {
284 /// Handler for Message message.
285 impl Handler<StandardMessage> for ChatServer {
286 type Result = MessageResult<StandardMessage>;
288 fn handle(&mut self, msg: StandardMessage, _: &mut Context<Self>) -> Self::Result {
289 let msg_out = match parse_json_message(self, msg) {
291 Err(e) => e.to_string(),
294 MessageResult(msg_out)
299 struct WebsocketResponse<T> {
304 fn to_json_string<T>(op: &UserOperation, data: T) -> Result<String, Error>
308 let response = WebsocketResponse {
312 Ok(serde_json::to_string(&response)?)
315 fn parse_json_message(chat: &mut ChatServer, msg: StandardMessage) -> Result<String, Error> {
316 let json: Value = serde_json::from_str(&msg.msg)?;
317 let data = &json["data"].to_string();
318 let op = &json["op"].as_str().ok_or(APIError {
319 message: "Unknown op type".to_string(),
322 let conn = chat.db.get()?;
324 let user_operation: UserOperation = UserOperation::from_str(&op)?;
326 match user_operation {
327 UserOperation::Login => {
328 let login: Login = serde_json::from_str(data)?;
329 let res = Oper::new(login).perform(&conn)?;
330 to_json_string(&user_operation, &res)
332 UserOperation::Register => {
333 let register: Register = serde_json::from_str(data)?;
334 let res = Oper::new(register).perform(&conn);
336 chat.check_rate_limit_register(msg.id)?;
338 to_json_string(&user_operation, &res?)
340 UserOperation::GetUserDetails => {
341 let get_user_details: GetUserDetails = serde_json::from_str(data)?;
342 let res = Oper::new(get_user_details).perform(&conn)?;
343 to_json_string(&user_operation, &res)
345 UserOperation::SaveUserSettings => {
346 let save_user_settings: SaveUserSettings = serde_json::from_str(data)?;
347 let res = Oper::new(save_user_settings).perform(&conn)?;
348 to_json_string(&user_operation, &res)
350 UserOperation::AddAdmin => {
351 let add_admin: AddAdmin = serde_json::from_str(data)?;
352 let res = Oper::new(add_admin).perform(&conn)?;
353 to_json_string(&user_operation, &res)
355 UserOperation::BanUser => {
356 let ban_user: BanUser = serde_json::from_str(data)?;
357 let res = Oper::new(ban_user).perform(&conn)?;
358 to_json_string(&user_operation, &res)
360 UserOperation::GetReplies => {
361 let get_replies: GetReplies = serde_json::from_str(data)?;
362 let res = Oper::new(get_replies).perform(&conn)?;
363 to_json_string(&user_operation, &res)
365 UserOperation::GetUserMentions => {
366 let get_user_mentions: GetUserMentions = serde_json::from_str(data)?;
367 let res = Oper::new(get_user_mentions).perform(&conn)?;
368 to_json_string(&user_operation, &res)
370 UserOperation::EditUserMention => {
371 let edit_user_mention: EditUserMention = serde_json::from_str(data)?;
372 let res = Oper::new(edit_user_mention).perform(&conn)?;
373 to_json_string(&user_operation, &res)
375 UserOperation::MarkAllAsRead => {
376 let mark_all_as_read: MarkAllAsRead = serde_json::from_str(data)?;
377 let res = Oper::new(mark_all_as_read).perform(&conn)?;
378 to_json_string(&user_operation, &res)
380 UserOperation::GetCommunity => {
381 let get_community: GetCommunity = serde_json::from_str(data)?;
382 let res = Oper::new(get_community).perform(&conn)?;
383 to_json_string(&user_operation, &res)
385 UserOperation::ListCommunities => {
386 let list_communities: ListCommunities = serde_json::from_str(data)?;
387 let res = Oper::new(list_communities).perform(&conn)?;
388 to_json_string(&user_operation, &res)
390 UserOperation::CreateCommunity => {
391 chat.check_rate_limit_register(msg.id)?;
392 let create_community: CreateCommunity = serde_json::from_str(data)?;
393 let res = Oper::new(create_community).perform(&conn)?;
394 to_json_string(&user_operation, &res)
396 UserOperation::EditCommunity => {
397 let edit_community: EditCommunity = serde_json::from_str(data)?;
398 let res = Oper::new(edit_community).perform(&conn)?;
399 let mut community_sent: CommunityResponse = res.clone();
400 community_sent.community.user_id = None;
401 community_sent.community.subscribed = None;
402 let community_sent_str = to_json_string(&user_operation, &community_sent)?;
403 chat.send_community_message(community_sent.community.id, &community_sent_str, msg.id)?;
404 to_json_string(&user_operation, &res)
406 UserOperation::FollowCommunity => {
407 let follow_community: FollowCommunity = serde_json::from_str(data)?;
408 let res = Oper::new(follow_community).perform(&conn)?;
409 to_json_string(&user_operation, &res)
411 UserOperation::GetFollowedCommunities => {
412 let followed_communities: GetFollowedCommunities = serde_json::from_str(data)?;
413 let res = Oper::new(followed_communities).perform(&conn)?;
414 to_json_string(&user_operation, &res)
416 UserOperation::BanFromCommunity => {
417 let ban_from_community: BanFromCommunity = serde_json::from_str(data)?;
418 let community_id = ban_from_community.community_id;
419 let res = Oper::new(ban_from_community).perform(&conn)?;
420 let res_str = to_json_string(&user_operation, &res)?;
421 chat.send_community_message(community_id, &res_str, msg.id)?;
424 UserOperation::AddModToCommunity => {
425 let mod_add_to_community: AddModToCommunity = serde_json::from_str(data)?;
426 let community_id = mod_add_to_community.community_id;
427 let res = Oper::new(mod_add_to_community).perform(&conn)?;
428 let res_str = to_json_string(&user_operation, &res)?;
429 chat.send_community_message(community_id, &res_str, msg.id)?;
432 UserOperation::ListCategories => {
433 let list_categories: ListCategories = ListCategories;
434 let res = Oper::new(list_categories).perform(&conn)?;
435 to_json_string(&user_operation, &res)
437 UserOperation::CreatePost => {
438 chat.check_rate_limit_post(msg.id)?;
439 let create_post: CreatePost = serde_json::from_str(data)?;
440 let res = Oper::new(create_post).perform(&conn)?;
441 to_json_string(&user_operation, &res)
443 UserOperation::GetPost => {
444 let get_post: GetPost = serde_json::from_str(data)?;
445 chat.join_room(get_post.id, msg.id);
446 let res = Oper::new(get_post).perform(&conn)?;
447 to_json_string(&user_operation, &res)
449 UserOperation::GetPosts => {
450 let get_posts: GetPosts = serde_json::from_str(data)?;
451 let res = Oper::new(get_posts).perform(&conn)?;
452 to_json_string(&user_operation, &res)
454 UserOperation::CreatePostLike => {
455 chat.check_rate_limit_message(msg.id)?;
456 let create_post_like: CreatePostLike = serde_json::from_str(data)?;
457 let res = Oper::new(create_post_like).perform(&conn)?;
458 to_json_string(&user_operation, &res)
460 UserOperation::EditPost => {
461 let edit_post: EditPost = serde_json::from_str(data)?;
462 let res = Oper::new(edit_post).perform(&conn)?;
463 let mut post_sent = res.clone();
464 post_sent.post.my_vote = None;
465 let post_sent_str = to_json_string(&user_operation, &post_sent)?;
466 chat.send_room_message(post_sent.post.id, &post_sent_str, msg.id);
467 to_json_string(&user_operation, &res)
469 UserOperation::SavePost => {
470 let save_post: SavePost = serde_json::from_str(data)?;
471 let res = Oper::new(save_post).perform(&conn)?;
472 to_json_string(&user_operation, &res)
474 UserOperation::CreateComment => {
475 chat.check_rate_limit_message(msg.id)?;
476 let create_comment: CreateComment = serde_json::from_str(data)?;
477 let post_id = create_comment.post_id;
478 let res = Oper::new(create_comment).perform(&conn)?;
479 let mut comment_sent = res.clone();
480 comment_sent.comment.my_vote = None;
481 comment_sent.comment.user_id = None;
482 let comment_sent_str = to_json_string(&user_operation, &comment_sent)?;
483 chat.send_room_message(post_id, &comment_sent_str, msg.id);
484 to_json_string(&user_operation, &res)
486 UserOperation::EditComment => {
487 let edit_comment: EditComment = serde_json::from_str(data)?;
488 let post_id = edit_comment.post_id;
489 let res = Oper::new(edit_comment).perform(&conn)?;
490 let mut comment_sent = res.clone();
491 comment_sent.comment.my_vote = None;
492 comment_sent.comment.user_id = None;
493 let comment_sent_str = to_json_string(&user_operation, &comment_sent)?;
494 chat.send_room_message(post_id, &comment_sent_str, msg.id);
495 to_json_string(&user_operation, &res)
497 UserOperation::SaveComment => {
498 let save_comment: SaveComment = serde_json::from_str(data)?;
499 let res = Oper::new(save_comment).perform(&conn)?;
500 to_json_string(&user_operation, &res)
502 UserOperation::CreateCommentLike => {
503 chat.check_rate_limit_message(msg.id)?;
504 let create_comment_like: CreateCommentLike = serde_json::from_str(data)?;
505 let post_id = create_comment_like.post_id;
506 let res = Oper::new(create_comment_like).perform(&conn)?;
507 let mut comment_sent = res.clone();
508 comment_sent.comment.my_vote = None;
509 comment_sent.comment.user_id = None;
510 let comment_sent_str = to_json_string(&user_operation, &comment_sent)?;
511 chat.send_room_message(post_id, &comment_sent_str, msg.id);
512 to_json_string(&user_operation, &res)
514 UserOperation::GetModlog => {
515 let get_modlog: GetModlog = serde_json::from_str(data)?;
516 let res = Oper::new(get_modlog).perform(&conn)?;
517 to_json_string(&user_operation, &res)
519 UserOperation::CreateSite => {
520 let create_site: CreateSite = serde_json::from_str(data)?;
521 let res = Oper::new(create_site).perform(&conn)?;
522 to_json_string(&user_operation, &res)
524 UserOperation::EditSite => {
525 let edit_site: EditSite = serde_json::from_str(data)?;
526 let res = Oper::new(edit_site).perform(&conn)?;
527 to_json_string(&user_operation, &res)
529 UserOperation::GetSite => {
530 let online: usize = chat.sessions.len();
531 let get_site: GetSite = serde_json::from_str(data)?;
532 let mut res = Oper::new(get_site).perform(&conn)?;
534 to_json_string(&user_operation, &res)
536 UserOperation::Search => {
537 let search: Search = serde_json::from_str(data)?;
538 let res = Oper::new(search).perform(&conn)?;
539 to_json_string(&user_operation, &res)
541 UserOperation::TransferCommunity => {
542 let transfer_community: TransferCommunity = serde_json::from_str(data)?;
543 let res = Oper::new(transfer_community).perform(&conn)?;
544 to_json_string(&user_operation, &res)
546 UserOperation::TransferSite => {
547 let transfer_site: TransferSite = serde_json::from_str(data)?;
548 let res = Oper::new(transfer_site).perform(&conn)?;
549 to_json_string(&user_operation, &res)
551 UserOperation::DeleteAccount => {
552 let delete_account: DeleteAccount = serde_json::from_str(data)?;
553 let res = Oper::new(delete_account).perform(&conn)?;
554 to_json_string(&user_operation, &res)
556 UserOperation::PasswordReset => {
557 let password_reset: PasswordReset = serde_json::from_str(data)?;
558 let res = Oper::new(password_reset).perform(&conn)?;
559 to_json_string(&user_operation, &res)
561 UserOperation::PasswordChange => {
562 let password_change: PasswordChange = serde_json::from_str(data)?;
563 let res = Oper::new(password_change).perform(&conn)?;
564 to_json_string(&user_operation, &res)