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, PooledConnection};
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 println!("Message Sent: {}", msg_out);
295 MessageResult(msg_out)
300 struct WebsocketResponse<T> {
305 fn to_json_string<T>(op: &UserOperation, data: T) -> Result<String, Error>
309 let response = WebsocketResponse {
313 Ok(serde_json::to_string(&response)?)
316 fn do_user_operation<'a, Data, Response>(
319 conn: &PooledConnection<ConnectionManager<PgConnection>>,
320 ) -> Result<String, Error>
322 for<'de> Data: Deserialize<'de> + 'a,
324 Oper<Data>: Perform<Response>,
326 let parsed_data: Data = serde_json::from_str(data)?;
327 let res = Oper::new(parsed_data).perform(&conn)?;
328 to_json_string(&op, &res)
331 fn parse_json_message(chat: &mut ChatServer, msg: StandardMessage) -> Result<String, Error> {
332 let json: Value = serde_json::from_str(&msg.msg)?;
333 let data = &json["data"].to_string();
334 let op = &json["op"].as_str().ok_or(APIError {
335 message: "Unknown op type".to_string(),
338 let conn = chat.db.get()?;
340 let user_operation: UserOperation = UserOperation::from_str(&op)?;
342 // TODO: none of the chat messages are going to work if stuff is submitted via http api,
343 // need to move that handling elsewhere
344 match user_operation {
345 UserOperation::Login => do_user_operation::<Login, LoginResponse>(user_operation, data, &conn),
346 UserOperation::Register => {
347 chat.check_rate_limit_register(msg.id)?;
348 do_user_operation::<Register, LoginResponse>(user_operation, data, &conn)
350 UserOperation::GetUserDetails => {
351 do_user_operation::<GetUserDetails, GetUserDetailsResponse>(user_operation, data, &conn)
353 UserOperation::SaveUserSettings => {
354 do_user_operation::<SaveUserSettings, LoginResponse>(user_operation, data, &conn)
356 UserOperation::AddAdmin => {
357 do_user_operation::<AddAdmin, AddAdminResponse>(user_operation, data, &conn)
359 UserOperation::BanUser => {
360 do_user_operation::<BanUser, BanUserResponse>(user_operation, data, &conn)
362 UserOperation::GetReplies => {
363 do_user_operation::<GetReplies, GetRepliesResponse>(user_operation, data, &conn)
365 UserOperation::GetUserMentions => {
366 do_user_operation::<GetUserMentions, GetUserMentionsResponse>(user_operation, data, &conn)
368 UserOperation::EditUserMention => {
369 do_user_operation::<EditUserMention, UserMentionResponse>(user_operation, data, &conn)
371 UserOperation::MarkAllAsRead => {
372 do_user_operation::<MarkAllAsRead, GetRepliesResponse>(user_operation, data, &conn)
374 UserOperation::GetCommunity => {
375 do_user_operation::<GetCommunity, GetCommunityResponse>(user_operation, data, &conn)
377 UserOperation::ListCommunities => {
378 do_user_operation::<ListCommunities, ListCommunitiesResponse>(user_operation, data, &conn)
380 UserOperation::CreateCommunity => {
381 chat.check_rate_limit_register(msg.id)?;
382 do_user_operation::<CreateCommunity, CommunityResponse>(user_operation, data, &conn)
384 UserOperation::EditCommunity => {
385 let edit_community: EditCommunity = serde_json::from_str(data)?;
386 let res = Oper::new(edit_community).perform(&conn)?;
387 let mut community_sent: CommunityResponse = res.clone();
388 community_sent.community.user_id = None;
389 community_sent.community.subscribed = None;
390 let community_sent_str = to_json_string(&user_operation, &community_sent)?;
391 chat.send_community_message(community_sent.community.id, &community_sent_str, msg.id)?;
392 to_json_string(&user_operation, &res)
394 UserOperation::FollowCommunity => {
395 do_user_operation::<FollowCommunity, CommunityResponse>(user_operation, data, &conn)
397 UserOperation::GetFollowedCommunities => do_user_operation::<
398 GetFollowedCommunities,
399 GetFollowedCommunitiesResponse,
400 >(user_operation, data, &conn),
401 UserOperation::BanFromCommunity => {
402 let ban_from_community: BanFromCommunity = serde_json::from_str(data)?;
403 let community_id = ban_from_community.community_id;
404 let res = Oper::new(ban_from_community).perform(&conn)?;
405 let res_str = to_json_string(&user_operation, &res)?;
406 chat.send_community_message(community_id, &res_str, msg.id)?;
409 UserOperation::AddModToCommunity => {
410 let mod_add_to_community: AddModToCommunity = serde_json::from_str(data)?;
411 let community_id = mod_add_to_community.community_id;
412 let res = Oper::new(mod_add_to_community).perform(&conn)?;
413 let res_str = to_json_string(&user_operation, &res)?;
414 chat.send_community_message(community_id, &res_str, msg.id)?;
417 UserOperation::ListCategories => {
418 do_user_operation::<ListCategories, ListCategoriesResponse>(user_operation, data, &conn)
420 UserOperation::CreatePost => {
421 chat.check_rate_limit_post(msg.id)?;
422 do_user_operation::<CreatePost, PostResponse>(user_operation, data, &conn)
424 UserOperation::GetPost => {
425 let get_post: GetPost = serde_json::from_str(data)?;
426 chat.join_room(get_post.id, msg.id);
427 let res = Oper::new(get_post).perform(&conn)?;
428 to_json_string(&user_operation, &res)
430 UserOperation::GetPosts => {
431 do_user_operation::<GetPosts, GetPostsResponse>(user_operation, data, &conn)
433 UserOperation::CreatePostLike => {
434 chat.check_rate_limit_message(msg.id)?;
435 do_user_operation::<CreatePostLike, CreatePostLikeResponse>(user_operation, data, &conn)
437 UserOperation::EditPost => {
438 let edit_post: EditPost = serde_json::from_str(data)?;
439 let res = Oper::new(edit_post).perform(&conn)?;
440 let mut post_sent = res.clone();
441 post_sent.post.my_vote = None;
442 let post_sent_str = to_json_string(&user_operation, &post_sent)?;
443 chat.send_room_message(post_sent.post.id, &post_sent_str, msg.id);
444 to_json_string(&user_operation, &res)
446 UserOperation::SavePost => {
447 do_user_operation::<SavePost, PostResponse>(user_operation, data, &conn)
449 UserOperation::CreateComment => {
450 chat.check_rate_limit_message(msg.id)?;
451 let create_comment: CreateComment = serde_json::from_str(data)?;
452 let post_id = create_comment.post_id;
453 let res = Oper::new(create_comment).perform(&conn)?;
454 let mut comment_sent = res.clone();
455 comment_sent.comment.my_vote = None;
456 comment_sent.comment.user_id = None;
457 let comment_sent_str = to_json_string(&user_operation, &comment_sent)?;
458 chat.send_room_message(post_id, &comment_sent_str, msg.id);
459 to_json_string(&user_operation, &res)
461 UserOperation::EditComment => {
462 let edit_comment: EditComment = serde_json::from_str(data)?;
463 let post_id = edit_comment.post_id;
464 let res = Oper::new(edit_comment).perform(&conn)?;
465 let mut comment_sent = res.clone();
466 comment_sent.comment.my_vote = None;
467 comment_sent.comment.user_id = None;
468 let comment_sent_str = to_json_string(&user_operation, &comment_sent)?;
469 chat.send_room_message(post_id, &comment_sent_str, msg.id);
470 to_json_string(&user_operation, &res)
472 UserOperation::SaveComment => {
473 do_user_operation::<SaveComment, CommentResponse>(user_operation, data, &conn)
475 UserOperation::CreateCommentLike => {
476 chat.check_rate_limit_message(msg.id)?;
477 let create_comment_like: CreateCommentLike = serde_json::from_str(data)?;
478 let post_id = create_comment_like.post_id;
479 let res = Oper::new(create_comment_like).perform(&conn)?;
480 let mut comment_sent = res.clone();
481 comment_sent.comment.my_vote = None;
482 comment_sent.comment.user_id = None;
483 let comment_sent_str = to_json_string(&user_operation, &comment_sent)?;
484 chat.send_room_message(post_id, &comment_sent_str, msg.id);
485 to_json_string(&user_operation, &res)
487 UserOperation::GetModlog => {
488 do_user_operation::<GetModlog, GetModlogResponse>(user_operation, data, &conn)
490 UserOperation::CreateSite => {
491 do_user_operation::<CreateSite, SiteResponse>(user_operation, data, &conn)
493 UserOperation::EditSite => {
494 do_user_operation::<EditSite, SiteResponse>(user_operation, data, &conn)
496 UserOperation::GetSite => {
497 let online: usize = chat.sessions.len();
498 let get_site: GetSite = serde_json::from_str(data)?;
499 let mut res = Oper::new(get_site).perform(&conn)?;
501 to_json_string(&user_operation, &res)
503 UserOperation::Search => {
504 do_user_operation::<Search, SearchResponse>(user_operation, data, &conn)
506 UserOperation::TransferCommunity => {
507 do_user_operation::<TransferCommunity, GetCommunityResponse>(user_operation, data, &conn)
509 UserOperation::TransferSite => {
510 do_user_operation::<TransferSite, GetSiteResponse>(user_operation, data, &conn)
512 UserOperation::DeleteAccount => {
513 do_user_operation::<DeleteAccount, LoginResponse>(user_operation, data, &conn)
515 UserOperation::PasswordReset => {
516 do_user_operation::<PasswordReset, PasswordResetResponse>(user_operation, data, &conn)
518 UserOperation::PasswordChange => {
519 do_user_operation::<PasswordChange, LoginResponse>(user_operation, data, &conn)
521 UserOperation::CreatePrivateMessage => {
522 chat.check_rate_limit_message(msg.id)?;
523 do_user_operation::<CreatePrivateMessage, PrivateMessageResponse>(user_operation, data, &conn)
525 UserOperation::EditPrivateMessage => {
526 do_user_operation::<EditPrivateMessage, PrivateMessageResponse>(user_operation, data, &conn)
528 UserOperation::GetPrivateMessages => {
529 do_user_operation::<GetPrivateMessages, PrivateMessagesResponse>(user_operation, data, &conn)