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384 lines
10 KiB
Rust
384 lines
10 KiB
Rust
use crate::{messages::*, serialize_websocket_message, LemmyContext, UserOperation};
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use actix::prelude::*;
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use anyhow::Context as acontext;
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use background_jobs::QueueHandle;
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use diesel::{
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r2d2::{ConnectionManager, Pool},
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PgConnection,
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};
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use lemmy_rate_limit::RateLimit;
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use lemmy_structs::{comment::*, post::*};
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use lemmy_utils::{
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location_info,
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APIError,
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CommunityId,
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ConnectionId,
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IPAddr,
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LemmyError,
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PostId,
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UserId,
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};
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use rand::rngs::ThreadRng;
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use reqwest::Client;
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use serde::Serialize;
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use serde_json::Value;
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use std::{
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collections::{HashMap, HashSet},
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str::FromStr,
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};
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use tokio::macros::support::Pin;
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type MessageHandlerType = fn(
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context: LemmyContext,
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id: ConnectionId,
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op: UserOperation,
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data: &str,
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) -> Pin<Box<dyn Future<Output = Result<String, LemmyError>> + '_>>;
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/// `ChatServer` manages chat rooms and responsible for coordinating chat
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/// session.
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pub struct ChatServer {
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/// A map from generated random ID to session addr
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pub sessions: HashMap<ConnectionId, SessionInfo>,
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/// A map from post_id to set of connectionIDs
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pub post_rooms: HashMap<PostId, HashSet<ConnectionId>>,
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/// A map from community to set of connectionIDs
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pub community_rooms: HashMap<CommunityId, HashSet<ConnectionId>>,
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/// A map from user id to its connection ID for joined users. Remember a user can have multiple
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/// sessions (IE clients)
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pub(super) user_rooms: HashMap<UserId, HashSet<ConnectionId>>,
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pub(super) rng: ThreadRng,
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/// The DB Pool
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pub(super) pool: Pool<ConnectionManager<PgConnection>>,
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/// Rate limiting based on rate type and IP addr
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pub(super) rate_limiter: RateLimit,
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/// A list of the current captchas
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pub(super) captchas: Vec<CaptchaItem>,
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message_handler: MessageHandlerType,
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/// An HTTP Client
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client: Client,
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activity_queue: QueueHandle,
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}
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pub struct SessionInfo {
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pub addr: Recipient<WSMessage>,
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pub ip: IPAddr,
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}
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/// `ChatServer` is an actor. It maintains list of connection client session.
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/// And manages available rooms. Peers send messages to other peers in same
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/// room through `ChatServer`.
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impl ChatServer {
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pub fn startup(
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pool: Pool<ConnectionManager<PgConnection>>,
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rate_limiter: RateLimit,
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message_handler: MessageHandlerType,
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client: Client,
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activity_queue: QueueHandle,
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) -> ChatServer {
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ChatServer {
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sessions: HashMap::new(),
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post_rooms: HashMap::new(),
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community_rooms: HashMap::new(),
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user_rooms: HashMap::new(),
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rng: rand::thread_rng(),
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pool,
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rate_limiter,
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captchas: Vec::new(),
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message_handler,
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client,
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activity_queue,
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}
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}
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pub fn join_community_room(
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&mut self,
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community_id: CommunityId,
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id: ConnectionId,
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) -> Result<(), LemmyError> {
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// remove session from all rooms
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for sessions in self.community_rooms.values_mut() {
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sessions.remove(&id);
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}
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// Also leave all post rooms
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// This avoids double messages
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for sessions in self.post_rooms.values_mut() {
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sessions.remove(&id);
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}
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// If the room doesn't exist yet
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if self.community_rooms.get_mut(&community_id).is_none() {
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self.community_rooms.insert(community_id, HashSet::new());
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}
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self
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.community_rooms
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.get_mut(&community_id)
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.context(location_info!())?
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.insert(id);
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Ok(())
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}
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pub fn join_post_room(&mut self, post_id: PostId, id: ConnectionId) -> Result<(), LemmyError> {
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// remove session from all rooms
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for sessions in self.post_rooms.values_mut() {
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sessions.remove(&id);
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}
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// Also leave all communities
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// This avoids double messages
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// TODO found a bug, whereby community messages like
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// delete and remove aren't sent, because
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// you left the community room
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for sessions in self.community_rooms.values_mut() {
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sessions.remove(&id);
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}
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// If the room doesn't exist yet
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if self.post_rooms.get_mut(&post_id).is_none() {
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self.post_rooms.insert(post_id, HashSet::new());
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}
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self
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.post_rooms
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.get_mut(&post_id)
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.context(location_info!())?
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.insert(id);
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Ok(())
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}
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pub fn join_user_room(&mut self, user_id: UserId, id: ConnectionId) -> Result<(), LemmyError> {
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// remove session from all rooms
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for sessions in self.user_rooms.values_mut() {
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sessions.remove(&id);
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}
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// If the room doesn't exist yet
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if self.user_rooms.get_mut(&user_id).is_none() {
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self.user_rooms.insert(user_id, HashSet::new());
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}
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self
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.user_rooms
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.get_mut(&user_id)
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.context(location_info!())?
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.insert(id);
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Ok(())
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}
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fn send_post_room_message<Response>(
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&self,
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op: &UserOperation,
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response: &Response,
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post_id: PostId,
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websocket_id: Option<ConnectionId>,
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) -> Result<(), LemmyError>
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where
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Response: Serialize,
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{
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let res_str = &serialize_websocket_message(op, response)?;
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if let Some(sessions) = self.post_rooms.get(&post_id) {
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for id in sessions {
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if let Some(my_id) = websocket_id {
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if *id == my_id {
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continue;
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}
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}
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self.sendit(res_str, *id);
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}
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}
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Ok(())
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}
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pub fn send_community_room_message<Response>(
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&self,
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op: &UserOperation,
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response: &Response,
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community_id: CommunityId,
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websocket_id: Option<ConnectionId>,
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) -> Result<(), LemmyError>
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where
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Response: Serialize,
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{
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let res_str = &serialize_websocket_message(op, response)?;
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if let Some(sessions) = self.community_rooms.get(&community_id) {
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for id in sessions {
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if let Some(my_id) = websocket_id {
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if *id == my_id {
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continue;
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}
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}
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self.sendit(res_str, *id);
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}
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}
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Ok(())
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}
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pub fn send_all_message<Response>(
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&self,
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op: &UserOperation,
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response: &Response,
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websocket_id: Option<ConnectionId>,
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) -> Result<(), LemmyError>
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where
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Response: Serialize,
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{
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let res_str = &serialize_websocket_message(op, response)?;
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for id in self.sessions.keys() {
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if let Some(my_id) = websocket_id {
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if *id == my_id {
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continue;
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}
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}
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self.sendit(res_str, *id);
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}
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Ok(())
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}
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pub fn send_user_room_message<Response>(
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&self,
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op: &UserOperation,
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response: &Response,
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recipient_id: UserId,
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websocket_id: Option<ConnectionId>,
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) -> Result<(), LemmyError>
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where
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Response: Serialize,
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{
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let res_str = &serialize_websocket_message(op, response)?;
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if let Some(sessions) = self.user_rooms.get(&recipient_id) {
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for id in sessions {
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if let Some(my_id) = websocket_id {
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if *id == my_id {
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continue;
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}
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}
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self.sendit(res_str, *id);
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}
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}
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Ok(())
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}
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pub fn send_comment(
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&self,
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user_operation: &UserOperation,
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comment: &CommentResponse,
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websocket_id: Option<ConnectionId>,
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) -> Result<(), LemmyError> {
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let mut comment_reply_sent = comment.clone();
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comment_reply_sent.comment.my_vote = None;
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comment_reply_sent.comment.user_id = None;
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let mut comment_post_sent = comment_reply_sent.clone();
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comment_post_sent.recipient_ids = Vec::new();
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// Send it to the post room
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self.send_post_room_message(
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user_operation,
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&comment_post_sent,
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comment_post_sent.comment.post_id,
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websocket_id,
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)?;
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// Send it to the recipient(s) including the mentioned users
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for recipient_id in &comment_reply_sent.recipient_ids {
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self.send_user_room_message(
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user_operation,
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&comment_reply_sent,
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*recipient_id,
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websocket_id,
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)?;
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}
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// Send it to the community too
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self.send_community_room_message(user_operation, &comment_post_sent, 0, websocket_id)?;
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self.send_community_room_message(
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user_operation,
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&comment_post_sent,
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comment.comment.community_id,
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websocket_id,
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)?;
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Ok(())
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}
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pub fn send_post(
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&self,
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user_operation: &UserOperation,
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post: &PostResponse,
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websocket_id: Option<ConnectionId>,
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) -> Result<(), LemmyError> {
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let community_id = post.post.community_id;
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// Don't send my data with it
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let mut post_sent = post.clone();
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post_sent.post.my_vote = None;
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post_sent.post.user_id = None;
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// Send it to /c/all and that community
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self.send_community_room_message(user_operation, &post_sent, 0, websocket_id)?;
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self.send_community_room_message(user_operation, &post_sent, community_id, websocket_id)?;
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// Send it to the post room
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self.send_post_room_message(user_operation, &post_sent, post.post.id, websocket_id)?;
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Ok(())
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}
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fn sendit(&self, message: &str, id: ConnectionId) {
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if let Some(info) = self.sessions.get(&id) {
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let _ = info.addr.do_send(WSMessage(message.to_owned()));
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}
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}
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pub(super) fn parse_json_message(
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&mut self,
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msg: StandardMessage,
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ctx: &mut Context<Self>,
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) -> impl Future<Output = Result<String, LemmyError>> {
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let rate_limiter = self.rate_limiter.clone();
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let ip: IPAddr = match self.sessions.get(&msg.id) {
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Some(info) => info.ip.to_owned(),
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None => "blank_ip".to_string(),
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};
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let context = LemmyContext {
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pool: self.pool.clone(),
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chat_server: ctx.address(),
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client: self.client.to_owned(),
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activity_queue: self.activity_queue.to_owned(),
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};
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let message_handler = self.message_handler;
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async move {
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let json: Value = serde_json::from_str(&msg.msg)?;
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let data = &json["data"].to_string();
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let op = &json["op"].as_str().ok_or(APIError {
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message: "Unknown op type".to_string(),
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})?;
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let user_operation = UserOperation::from_str(&op)?;
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let fut = (message_handler)(context, msg.id, user_operation.clone(), data);
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match user_operation {
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UserOperation::Register => rate_limiter.register().wrap(ip, fut).await,
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UserOperation::CreatePost => rate_limiter.post().wrap(ip, fut).await,
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UserOperation::CreateCommunity => rate_limiter.register().wrap(ip, fut).await,
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_ => rate_limiter.message().wrap(ip, fut).await,
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}
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}
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}
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}
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