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)
298 fn to_json_string<T>(op: UserOperation, data: T) -> Result<String, Error>
303 let mut json = serde_json::to_value(&data)?;
304 match json.as_object_mut() {
305 Some(j) => j.insert("op".to_string(), serde_json::to_value(op.to_string())?),
306 None => return Err(format_err!("")),
308 // TODO: it seems like this is never called?
309 let x = serde_json::to_string(&json)?;
313 fn parse_json_message(chat: &mut ChatServer, msg: StandardMessage) -> Result<String, Error> {
314 let json: Value = serde_json::from_str(&msg.msg)?;
315 let data = &json["data"].to_string();
316 let op = &json["op"].as_str().ok_or(APIError {
317 message: "Unknown op type".to_string(),
320 let conn = chat.db.get()?;
322 let user_operation: UserOperation = UserOperation::from_str(&op)?;
324 match user_operation {
325 UserOperation::Login => {
326 let login: Login = serde_json::from_str(data)?;
327 let res = Oper::new(login).perform(&conn)?;
328 to_json_string(user_operation, &res)
330 UserOperation::Register => {
331 let register: Register = serde_json::from_str(data)?;
332 let res = Oper::new(register).perform(&conn);
334 chat.check_rate_limit_register(msg.id)?;
336 Ok(serde_json::to_string(&res?)?)
338 UserOperation::GetUserDetails => {
339 let get_user_details: GetUserDetails = serde_json::from_str(data)?;
340 let res = Oper::new(get_user_details).perform(&conn)?;
341 to_json_string(user_operation, &res)
343 UserOperation::SaveUserSettings => {
344 let save_user_settings: SaveUserSettings = serde_json::from_str(data)?;
345 let res = Oper::new(save_user_settings).perform(&conn)?;
346 to_json_string(user_operation, &res)
348 UserOperation::AddAdmin => {
349 let add_admin: AddAdmin = serde_json::from_str(data)?;
350 let res = Oper::new(add_admin).perform(&conn)?;
351 to_json_string(user_operation, &res)
353 UserOperation::BanUser => {
354 let ban_user: BanUser = serde_json::from_str(data)?;
355 let res = Oper::new(ban_user).perform(&conn)?;
356 to_json_string(user_operation, &res)
358 UserOperation::GetReplies => {
359 let get_replies: GetReplies = serde_json::from_str(data)?;
360 let res = Oper::new(get_replies).perform(&conn)?;
361 to_json_string(user_operation, &res)
363 UserOperation::GetUserMentions => {
364 let get_user_mentions: GetUserMentions = serde_json::from_str(data)?;
365 let res = Oper::new(get_user_mentions).perform(&conn)?;
366 to_json_string(user_operation, &res)
368 UserOperation::EditUserMention => {
369 let edit_user_mention: EditUserMention = serde_json::from_str(data)?;
370 let res = Oper::new(edit_user_mention).perform(&conn)?;
371 to_json_string(user_operation, &res)
373 UserOperation::MarkAllAsRead => {
374 let mark_all_as_read: MarkAllAsRead = serde_json::from_str(data)?;
375 let res = Oper::new(mark_all_as_read).perform(&conn)?;
376 to_json_string(user_operation, &res)
378 UserOperation::GetCommunity => {
379 let get_community: GetCommunity = serde_json::from_str(data)?;
380 let res = Oper::new(get_community).perform(&conn)?;
381 to_json_string(user_operation, &res)
383 UserOperation::ListCommunities => {
384 let list_communities: ListCommunities = serde_json::from_str(data)?;
385 let res = Oper::new(list_communities).perform(&conn)?;
386 to_json_string(user_operation, &res)
388 UserOperation::CreateCommunity => {
389 chat.check_rate_limit_register(msg.id)?;
390 let create_community: CreateCommunity = serde_json::from_str(data)?;
391 let res = Oper::new(create_community).perform(&conn)?;
392 to_json_string(user_operation, &res)
394 UserOperation::EditCommunity => {
395 let edit_community: EditCommunity = serde_json::from_str(data)?;
396 let res = Oper::new(edit_community).perform(&conn)?;
397 let mut community_sent: CommunityResponse = res.clone();
398 community_sent.community.user_id = None;
399 community_sent.community.subscribed = None;
400 let community_sent_str = serde_json::to_string(&community_sent)?;
401 chat.send_community_message(community_sent.community.id, &community_sent_str, msg.id)?;
402 to_json_string(user_operation, &res)
404 UserOperation::FollowCommunity => {
405 let follow_community: FollowCommunity = serde_json::from_str(data)?;
406 let res = Oper::new(follow_community).perform(&conn)?;
407 to_json_string(user_operation, &res)
409 UserOperation::GetFollowedCommunities => {
410 let followed_communities: GetFollowedCommunities = serde_json::from_str(data)?;
411 let res = Oper::new(followed_communities).perform(&conn)?;
412 to_json_string(user_operation, &res)
414 UserOperation::BanFromCommunity => {
415 let ban_from_community: BanFromCommunity = serde_json::from_str(data)?;
416 let community_id = ban_from_community.community_id;
417 let res = Oper::new(ban_from_community).perform(&conn)?;
418 let res_str = serde_json::to_string(&res)?;
419 chat.send_community_message(community_id, &res_str, msg.id)?;
422 UserOperation::AddModToCommunity => {
423 let mod_add_to_community: AddModToCommunity = serde_json::from_str(data)?;
424 let community_id = mod_add_to_community.community_id;
425 let res = Oper::new(mod_add_to_community).perform(&conn)?;
426 let res_str = serde_json::to_string(&res)?;
427 chat.send_community_message(community_id, &res_str, msg.id)?;
430 UserOperation::ListCategories => {
431 let list_categories: ListCategories = ListCategories;
432 let res = Oper::new(list_categories).perform(&conn)?;
433 to_json_string(user_operation, &res)
435 UserOperation::CreatePost => {
436 chat.check_rate_limit_post(msg.id)?;
437 let create_post: CreatePost = serde_json::from_str(data)?;
438 let res = Oper::new(create_post).perform(&conn)?;
439 to_json_string(user_operation, &res)
441 UserOperation::GetPost => {
442 let get_post: GetPost = serde_json::from_str(data)?;
443 chat.join_room(get_post.id, msg.id);
444 let res = Oper::new(get_post).perform(&conn)?;
445 to_json_string(user_operation, &res)
447 UserOperation::GetPosts => {
448 let get_posts: GetPosts = serde_json::from_str(data)?;
449 let res = Oper::new(get_posts).perform(&conn)?;
450 to_json_string(user_operation, &res)
452 UserOperation::CreatePostLike => {
453 chat.check_rate_limit_message(msg.id)?;
454 let create_post_like: CreatePostLike = serde_json::from_str(data)?;
455 let res = Oper::new(create_post_like).perform(&conn)?;
456 to_json_string(user_operation, &res)
458 UserOperation::EditPost => {
459 let edit_post: EditPost = serde_json::from_str(data)?;
460 let res = Oper::new(edit_post).perform(&conn)?;
461 let mut post_sent = res.clone();
462 post_sent.post.my_vote = None;
463 let post_sent_str = serde_json::to_string(&post_sent)?;
464 chat.send_room_message(post_sent.post.id, &post_sent_str, msg.id);
465 to_json_string(user_operation, &res)
467 UserOperation::SavePost => {
468 let save_post: SavePost = serde_json::from_str(data)?;
469 let res = Oper::new(save_post).perform(&conn)?;
470 to_json_string(user_operation, &res)
472 UserOperation::CreateComment => {
473 chat.check_rate_limit_message(msg.id)?;
474 let create_comment: CreateComment = serde_json::from_str(data)?;
475 let post_id = create_comment.post_id;
476 let res = Oper::new(create_comment).perform(&conn)?;
477 let mut comment_sent = res.clone();
478 comment_sent.comment.my_vote = None;
479 comment_sent.comment.user_id = None;
480 let comment_sent_str = serde_json::to_string(&comment_sent)?;
481 chat.send_room_message(post_id, &comment_sent_str, msg.id);
482 to_json_string(user_operation, &res)
484 UserOperation::EditComment => {
485 let edit_comment: EditComment = serde_json::from_str(data)?;
486 let post_id = edit_comment.post_id;
487 let res = Oper::new(edit_comment).perform(&conn)?;
488 let mut comment_sent = res.clone();
489 comment_sent.comment.my_vote = None;
490 comment_sent.comment.user_id = None;
491 let comment_sent_str = serde_json::to_string(&comment_sent)?;
492 chat.send_room_message(post_id, &comment_sent_str, msg.id);
493 to_json_string(user_operation, &res)
495 UserOperation::SaveComment => {
496 let save_comment: SaveComment = serde_json::from_str(data)?;
497 let res = Oper::new(save_comment).perform(&conn)?;
498 to_json_string(user_operation, &res)
500 UserOperation::CreateCommentLike => {
501 chat.check_rate_limit_message(msg.id)?;
502 let create_comment_like: CreateCommentLike = serde_json::from_str(data)?;
503 let post_id = create_comment_like.post_id;
504 let res = Oper::new(create_comment_like).perform(&conn)?;
505 let mut comment_sent = res.clone();
506 comment_sent.comment.my_vote = None;
507 comment_sent.comment.user_id = None;
508 let comment_sent_str = serde_json::to_string(&comment_sent)?;
509 chat.send_room_message(post_id, &comment_sent_str, msg.id);
510 to_json_string(user_operation, &res)
512 UserOperation::GetModlog => {
513 let get_modlog: GetModlog = serde_json::from_str(data)?;
514 let res = Oper::new(get_modlog).perform(&conn)?;
515 to_json_string(user_operation, &res)
517 UserOperation::CreateSite => {
518 let create_site: CreateSite = serde_json::from_str(data)?;
519 let res = Oper::new(create_site).perform(&conn)?;
520 to_json_string(user_operation, &res)
522 UserOperation::EditSite => {
523 let edit_site: EditSite = serde_json::from_str(data)?;
524 let res = Oper::new(edit_site).perform(&conn)?;
525 to_json_string(user_operation, &res)
527 UserOperation::GetSite => {
528 let online: usize = chat.sessions.len();
529 let get_site: GetSite = serde_json::from_str(data)?;
530 let mut res = Oper::new(get_site).perform(&conn)?;
532 to_json_string(user_operation, &res)
534 UserOperation::Search => {
535 let search: Search = serde_json::from_str(data)?;
536 let res = Oper::new(search).perform(&conn)?;
537 to_json_string(user_operation, &res)
539 UserOperation::TransferCommunity => {
540 let transfer_community: TransferCommunity = serde_json::from_str(data)?;
541 let res = Oper::new(transfer_community).perform(&conn)?;
542 to_json_string(user_operation, &res)
544 UserOperation::TransferSite => {
545 let transfer_site: TransferSite = serde_json::from_str(data)?;
546 let res = Oper::new(transfer_site).perform(&conn)?;
547 to_json_string(user_operation, &res)
549 UserOperation::DeleteAccount => {
550 let delete_account: DeleteAccount = serde_json::from_str(data)?;
551 let res = Oper::new(delete_account).perform(&conn)?;
552 to_json_string(user_operation, &res)
554 UserOperation::PasswordReset => {
555 let password_reset: PasswordReset = serde_json::from_str(data)?;
556 let res = Oper::new(password_reset).perform(&conn)?;
557 to_json_string(user_operation, &res)
559 UserOperation::PasswordChange => {
560 let password_change: PasswordChange = serde_json::from_str(data)?;
561 let res = Oper::new(password_change).perform(&conn)?;
562 to_json_string(user_operation, &res)