lemmy/server/src/websocket/server.rs

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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 super::*;
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use crate::{
api::{comment::*, community::*, post::*, site::*, user::*, *},
rate_limit::RateLimit,
websocket::UserOperation,
CommunityId,
ConnectionId,
DbPool,
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IPAddr,
LemmyError,
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PostId,
UserId,
};
use actix_web::client::Client;
/// Chat server sends this messages to session
#[derive(Message)]
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#[rtype(result = "()")]
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: IPAddr,
}
/// Session is disconnected
#[derive(Message)]
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#[rtype(result = "()")]
pub struct Disconnect {
pub id: ConnectionId,
pub ip: IPAddr,
}
/// The messages sent to websocket clients
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#[derive(Serialize, Deserialize, Message)]
#[rtype(result = "Result<String, std::convert::Infallible>")]
pub struct StandardMessage {
/// Id of the client session
pub id: ConnectionId,
/// Peer message
pub msg: String,
}
#[derive(Message)]
#[rtype(result = "()")]
pub struct SendAllMessage<Response> {
pub op: UserOperation,
pub response: Response,
pub my_id: Option<ConnectionId>,
}
#[derive(Message)]
#[rtype(result = "()")]
pub struct SendUserRoomMessage<Response> {
pub op: UserOperation,
pub response: Response,
pub recipient_id: UserId,
pub my_id: Option<ConnectionId>,
}
#[derive(Message)]
#[rtype(result = "()")]
pub struct SendCommunityRoomMessage<Response> {
pub op: UserOperation,
pub response: Response,
pub community_id: CommunityId,
pub my_id: Option<ConnectionId>,
}
#[derive(Message)]
#[rtype(result = "()")]
pub struct SendPost {
pub op: UserOperation,
pub post: PostResponse,
pub my_id: Option<ConnectionId>,
}
#[derive(Message)]
#[rtype(result = "()")]
pub struct SendComment {
pub op: UserOperation,
pub comment: CommentResponse,
pub my_id: Option<ConnectionId>,
}
#[derive(Message)]
#[rtype(result = "()")]
pub struct JoinUserRoom {
pub user_id: UserId,
pub id: ConnectionId,
}
#[derive(Message)]
#[rtype(result = "()")]
pub struct JoinCommunityRoom {
pub community_id: CommunityId,
pub id: ConnectionId,
}
#[derive(Message)]
#[rtype(result = "()")]
pub struct JoinPostRoom {
pub post_id: PostId,
pub id: ConnectionId,
}
#[derive(Message)]
#[rtype(usize)]
pub struct GetUsersOnline;
#[derive(Message)]
#[rtype(usize)]
pub struct GetPostUsersOnline {
pub post_id: PostId,
}
#[derive(Message)]
#[rtype(usize)]
pub struct GetCommunityUsersOnline {
pub community_id: CommunityId,
}
pub struct SessionInfo {
pub addr: Recipient<WSMessage>,
pub ip: IPAddr,
}
/// `ChatServer` manages chat rooms and responsible for coordinating chat
/// session.
pub struct ChatServer {
/// A map from generated random ID to session addr
pub sessions: HashMap<ConnectionId, SessionInfo>,
/// A map from post_id to set of connectionIDs
pub post_rooms: HashMap<PostId, HashSet<ConnectionId>>,
/// A map from community to set of connectionIDs
pub community_rooms: HashMap<CommunityId, HashSet<ConnectionId>>,
/// A map from user id to its connection ID for joined users. Remember a user can have multiple
/// sessions (IE clients)
user_rooms: HashMap<UserId, HashSet<ConnectionId>>,
rng: ThreadRng,
/// The DB Pool
pool: Pool<ConnectionManager<PgConnection>>,
/// Rate limiting based on rate type and IP addr
rate_limiter: RateLimit,
/// An HTTP Client
client: Client,
}
impl ChatServer {
pub fn startup(
pool: Pool<ConnectionManager<PgConnection>>,
rate_limiter: RateLimit,
client: Client,
) -> ChatServer {
ChatServer {
sessions: HashMap::new(),
post_rooms: HashMap::new(),
community_rooms: HashMap::new(),
user_rooms: HashMap::new(),
rng: rand::thread_rng(),
pool,
rate_limiter,
client,
}
}
pub fn join_community_room(&mut self, community_id: CommunityId, id: ConnectionId) {
// remove session from all rooms
for sessions in self.community_rooms.values_mut() {
sessions.remove(&id);
}
// Also leave all post rooms
// This avoids double messages
for sessions in self.post_rooms.values_mut() {
sessions.remove(&id);
}
// If the room doesn't exist yet
if self.community_rooms.get_mut(&community_id).is_none() {
self.community_rooms.insert(community_id, HashSet::new());
}
self
.community_rooms
.get_mut(&community_id)
.unwrap()
.insert(id);
}
pub fn join_post_room(&mut self, post_id: PostId, id: ConnectionId) {
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// remove session from all rooms
for sessions in self.post_rooms.values_mut() {
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sessions.remove(&id);
}
// Also leave all communities
// This avoids double messages
for sessions in self.community_rooms.values_mut() {
sessions.remove(&id);
}
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// If the room doesn't exist yet
if self.post_rooms.get_mut(&post_id).is_none() {
self.post_rooms.insert(post_id, HashSet::new());
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}
self.post_rooms.get_mut(&post_id).unwrap().insert(id);
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}
pub fn join_user_room(&mut self, user_id: UserId, id: ConnectionId) {
// remove session from all rooms
for sessions in self.user_rooms.values_mut() {
sessions.remove(&id);
}
// If the room doesn't exist yet
if self.user_rooms.get_mut(&user_id).is_none() {
self.user_rooms.insert(user_id, HashSet::new());
}
self.user_rooms.get_mut(&user_id).unwrap().insert(id);
}
fn send_post_room_message<Response>(
&self,
op: &UserOperation,
response: &Response,
post_id: PostId,
my_id: Option<ConnectionId>,
) -> Result<(), LemmyError>
where
Response: Serialize,
{
let res_str = &to_json_string(op, response)?;
if let Some(sessions) = self.post_rooms.get(&post_id) {
for id in sessions {
if let Some(my_id) = my_id {
if *id == my_id {
continue;
}
}
self.sendit(res_str, *id);
}
}
Ok(())
}
pub fn send_community_room_message<Response>(
&self,
op: &UserOperation,
response: &Response,
community_id: CommunityId,
my_id: Option<ConnectionId>,
) -> Result<(), LemmyError>
where
Response: Serialize,
{
let res_str = &to_json_string(op, response)?;
if let Some(sessions) = self.community_rooms.get(&community_id) {
for id in sessions {
if let Some(my_id) = my_id {
if *id == my_id {
continue;
}
}
self.sendit(res_str, *id);
}
}
Ok(())
}
pub fn send_all_message<Response>(
&self,
op: &UserOperation,
response: &Response,
my_id: Option<ConnectionId>,
) -> Result<(), LemmyError>
where
Response: Serialize,
{
let res_str = &to_json_string(op, response)?;
for id in self.sessions.keys() {
if let Some(my_id) = my_id {
if *id == my_id {
continue;
}
}
self.sendit(res_str, *id);
}
Ok(())
}
pub fn send_user_room_message<Response>(
&self,
op: &UserOperation,
response: &Response,
recipient_id: UserId,
my_id: Option<ConnectionId>,
) -> Result<(), LemmyError>
where
Response: Serialize,
{
let res_str = &to_json_string(op, response)?;
if let Some(sessions) = self.user_rooms.get(&recipient_id) {
for id in sessions {
if let Some(my_id) = my_id {
if *id == my_id {
continue;
}
}
self.sendit(res_str, *id);
}
}
Ok(())
}
pub fn send_comment(
&self,
user_operation: &UserOperation,
comment: &CommentResponse,
my_id: Option<ConnectionId>,
) -> Result<(), LemmyError> {
let mut comment_reply_sent = comment.clone();
comment_reply_sent.comment.my_vote = None;
comment_reply_sent.comment.user_id = None;
let mut comment_post_sent = comment_reply_sent.clone();
comment_post_sent.recipient_ids = Vec::new();
// Send it to the post room
self.send_post_room_message(
user_operation,
&comment_post_sent,
comment_post_sent.comment.post_id,
my_id,
)?;
// Send it to the recipient(s) including the mentioned users
for recipient_id in &comment_reply_sent.recipient_ids {
self.send_user_room_message(user_operation, &comment_reply_sent, *recipient_id, my_id)?;
}
// Send it to the community too
self.send_community_room_message(user_operation, &comment_post_sent, 0, my_id)?;
self.send_community_room_message(
user_operation,
&comment_post_sent,
comment.comment.community_id,
my_id,
)?;
Ok(())
}
pub fn send_post(
&self,
user_operation: &UserOperation,
post: &PostResponse,
my_id: Option<ConnectionId>,
) -> Result<(), LemmyError> {
let community_id = post.post.community_id;
// Don't send my data with it
let mut post_sent = post.clone();
post_sent.post.my_vote = None;
post_sent.post.user_id = None;
// Send it to /c/all and that community
self.send_community_room_message(user_operation, &post_sent, 0, my_id)?;
self.send_community_room_message(user_operation, &post_sent, community_id, my_id)?;
// Send it to the post room
self.send_post_room_message(user_operation, &post_sent, post.post.id, my_id)?;
Ok(())
}
fn sendit(&self, message: &str, id: ConnectionId) {
if let Some(info) = self.sessions.get(&id) {
let _ = info.addr.do_send(WSMessage(message.to_owned()));
}
}
fn parse_json_message(
&mut self,
msg: StandardMessage,
ctx: &mut Context<Self>,
) -> impl Future<Output = Result<String, LemmyError>> {
let addr = ctx.address();
let pool = self.pool.clone();
let rate_limiter = self.rate_limiter.clone();
let ip: IPAddr = match self.sessions.get(&msg.id) {
Some(info) => info.ip.to_owned(),
None => "blank_ip".to_string(),
};
let client = self.client.clone();
async move {
let msg = msg;
let json: Value = serde_json::from_str(&msg.msg)?;
let data = &json["data"].to_string();
let op = &json["op"].as_str().ok_or(APIError {
message: "Unknown op type".to_string(),
})?;
let user_operation: UserOperation = UserOperation::from_str(&op)?;
let args = Args {
client,
pool,
rate_limiter,
chatserver: addr,
id: msg.id,
ip,
op: user_operation.clone(),
data,
};
match user_operation {
// User ops
UserOperation::Login => do_user_operation::<Login>(args).await,
UserOperation::Register => do_user_operation::<Register>(args).await,
UserOperation::GetUserDetails => do_user_operation::<GetUserDetails>(args).await,
UserOperation::GetReplies => do_user_operation::<GetReplies>(args).await,
UserOperation::AddAdmin => do_user_operation::<AddAdmin>(args).await,
UserOperation::BanUser => do_user_operation::<BanUser>(args).await,
UserOperation::GetUserMentions => do_user_operation::<GetUserMentions>(args).await,
UserOperation::EditUserMention => do_user_operation::<EditUserMention>(args).await,
UserOperation::MarkAllAsRead => do_user_operation::<MarkAllAsRead>(args).await,
UserOperation::DeleteAccount => do_user_operation::<DeleteAccount>(args).await,
UserOperation::PasswordReset => do_user_operation::<PasswordReset>(args).await,
UserOperation::PasswordChange => do_user_operation::<PasswordChange>(args).await,
UserOperation::CreatePrivateMessage => {
do_user_operation::<CreatePrivateMessage>(args).await
}
UserOperation::EditPrivateMessage => do_user_operation::<EditPrivateMessage>(args).await,
UserOperation::GetPrivateMessages => do_user_operation::<GetPrivateMessages>(args).await,
UserOperation::UserJoin => do_user_operation::<UserJoin>(args).await,
UserOperation::SaveUserSettings => do_user_operation::<SaveUserSettings>(args).await,
// Site ops
UserOperation::GetModlog => do_user_operation::<GetModlog>(args).await,
UserOperation::CreateSite => do_user_operation::<CreateSite>(args).await,
UserOperation::EditSite => do_user_operation::<EditSite>(args).await,
UserOperation::GetSite => do_user_operation::<GetSite>(args).await,
UserOperation::GetSiteConfig => do_user_operation::<GetSiteConfig>(args).await,
UserOperation::SaveSiteConfig => do_user_operation::<SaveSiteConfig>(args).await,
UserOperation::Search => do_user_operation::<Search>(args).await,
UserOperation::TransferCommunity => do_user_operation::<TransferCommunity>(args).await,
UserOperation::TransferSite => do_user_operation::<TransferSite>(args).await,
UserOperation::ListCategories => do_user_operation::<ListCategories>(args).await,
// Community ops
UserOperation::GetCommunity => do_user_operation::<GetCommunity>(args).await,
UserOperation::ListCommunities => do_user_operation::<ListCommunities>(args).await,
UserOperation::CreateCommunity => do_user_operation::<CreateCommunity>(args).await,
UserOperation::EditCommunity => do_user_operation::<EditCommunity>(args).await,
UserOperation::FollowCommunity => do_user_operation::<FollowCommunity>(args).await,
UserOperation::GetFollowedCommunities => {
do_user_operation::<GetFollowedCommunities>(args).await
}
UserOperation::BanFromCommunity => do_user_operation::<BanFromCommunity>(args).await,
UserOperation::AddModToCommunity => do_user_operation::<AddModToCommunity>(args).await,
// Post ops
UserOperation::CreatePost => do_user_operation::<CreatePost>(args).await,
UserOperation::GetPost => do_user_operation::<GetPost>(args).await,
UserOperation::GetPosts => do_user_operation::<GetPosts>(args).await,
UserOperation::EditPost => do_user_operation::<EditPost>(args).await,
UserOperation::CreatePostLike => do_user_operation::<CreatePostLike>(args).await,
UserOperation::SavePost => do_user_operation::<SavePost>(args).await,
// Comment ops
UserOperation::CreateComment => do_user_operation::<CreateComment>(args).await,
UserOperation::EditComment => do_user_operation::<EditComment>(args).await,
UserOperation::SaveComment => do_user_operation::<SaveComment>(args).await,
UserOperation::GetComments => do_user_operation::<GetComments>(args).await,
UserOperation::CreateCommentLike => do_user_operation::<CreateCommentLike>(args).await,
}
}
}
}
struct Args<'a> {
client: Client,
pool: DbPool,
rate_limiter: RateLimit,
chatserver: Addr<ChatServer>,
id: ConnectionId,
ip: IPAddr,
op: UserOperation,
data: &'a str,
}
async fn do_user_operation<'a, 'b, Data>(args: Args<'b>) -> Result<String, LemmyError>
where
for<'de> Data: Deserialize<'de> + 'a,
Oper<Data>: Perform,
{
let Args {
client,
pool,
rate_limiter,
chatserver,
id,
ip,
op,
data,
} = args;
let ws_info = WebsocketInfo {
chatserver,
id: Some(id),
};
let data = data.to_string();
let op2 = op.clone();
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let client = client.clone();
let fut = async move {
let pool = pool.clone();
let parsed_data: Data = serde_json::from_str(&data)?;
let res = Oper::new(parsed_data, client)
.perform(&pool, Some(ws_info))
.await?;
to_json_string(&op, &res)
};
match op2 {
UserOperation::Register => rate_limiter.register().wrap(ip, fut).await,
UserOperation::CreatePost => rate_limiter.post().wrap(ip, fut).await,
UserOperation::CreateCommunity => rate_limiter.register().wrap(ip, fut).await,
_ => rate_limiter.message().wrap(ip, fut).await,
}
}
/// 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 {
// register session with random id
let id = self.rng.gen::<usize>();
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info!("{} joined", &msg.ip);
self.sessions.insert(
id,
SessionInfo {
addr: msg.addr,
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ip: msg.ip,
},
);
id
}
}
/// Handler for Disconnect message.
impl Handler<Disconnect> for ChatServer {
type Result = ();
fn handle(&mut self, msg: Disconnect, _: &mut Context<Self>) {
// Remove connections from sessions and all 3 scopes
if self.sessions.remove(&msg.id).is_some() {
for sessions in self.user_rooms.values_mut() {
sessions.remove(&msg.id);
}
for sessions in self.post_rooms.values_mut() {
sessions.remove(&msg.id);
}
for sessions in self.community_rooms.values_mut() {
sessions.remove(&msg.id);
}
}
}
}
/// Handler for Message message.
impl Handler<StandardMessage> for ChatServer {
type Result = ResponseFuture<Result<String, std::convert::Infallible>>;
fn handle(&mut self, msg: StandardMessage, ctx: &mut Context<Self>) -> Self::Result {
let fut = self.parse_json_message(msg, ctx);
Box::pin(async move {
match fut.await {
Ok(m) => {
info!("Message Sent: {}", m);
Ok(m)
}
Err(e) => {
error!("Error during message handling {}", e);
Ok(e.to_string())
}
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}
})
}
}
impl<Response> Handler<SendAllMessage<Response>> for ChatServer
where
Response: Serialize,
{
type Result = ();
fn handle(&mut self, msg: SendAllMessage<Response>, _: &mut Context<Self>) {
self
.send_all_message(&msg.op, &msg.response, msg.my_id)
.unwrap();
}
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}
impl<Response> Handler<SendUserRoomMessage<Response>> for ChatServer
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where
Response: Serialize,
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{
type Result = ();
fn handle(&mut self, msg: SendUserRoomMessage<Response>, _: &mut Context<Self>) {
self
.send_user_room_message(&msg.op, &msg.response, msg.recipient_id, msg.my_id)
.unwrap();
}
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}
impl<Response> Handler<SendCommunityRoomMessage<Response>> for ChatServer
where
Response: Serialize,
{
type Result = ();
fn handle(&mut self, msg: SendCommunityRoomMessage<Response>, _: &mut Context<Self>) {
self
.send_community_room_message(&msg.op, &msg.response, msg.community_id, msg.my_id)
.unwrap();
}
}
impl Handler<SendPost> for ChatServer {
type Result = ();
fn handle(&mut self, msg: SendPost, _: &mut Context<Self>) {
self.send_post(&msg.op, &msg.post, msg.my_id).unwrap();
}
}
impl Handler<SendComment> for ChatServer {
type Result = ();
fn handle(&mut self, msg: SendComment, _: &mut Context<Self>) {
self.send_comment(&msg.op, &msg.comment, msg.my_id).unwrap();
}
}
impl Handler<JoinUserRoom> for ChatServer {
type Result = ();
fn handle(&mut self, msg: JoinUserRoom, _: &mut Context<Self>) {
self.join_user_room(msg.user_id, msg.id);
}
}
impl Handler<JoinCommunityRoom> for ChatServer {
type Result = ();
fn handle(&mut self, msg: JoinCommunityRoom, _: &mut Context<Self>) {
self.join_community_room(msg.community_id, msg.id);
}
}
impl Handler<JoinPostRoom> for ChatServer {
type Result = ();
fn handle(&mut self, msg: JoinPostRoom, _: &mut Context<Self>) {
self.join_post_room(msg.post_id, msg.id);
}
}
impl Handler<GetUsersOnline> for ChatServer {
type Result = usize;
fn handle(&mut self, _msg: GetUsersOnline, _: &mut Context<Self>) -> Self::Result {
self.sessions.len()
}
}
impl Handler<GetPostUsersOnline> for ChatServer {
type Result = usize;
fn handle(&mut self, msg: GetPostUsersOnline, _: &mut Context<Self>) -> Self::Result {
if let Some(users) = self.post_rooms.get(&msg.post_id) {
users.len()
} else {
0
}
}
}
impl Handler<GetCommunityUsersOnline> for ChatServer {
type Result = usize;
fn handle(&mut self, msg: GetCommunityUsersOnline, _: &mut Context<Self>) -> Self::Result {
if let Some(users) = self.community_rooms.get(&msg.community_id) {
users.len()
} else {
0
}
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}
}
#[derive(Serialize)]
struct WebsocketResponse<T> {
op: String,
data: T,
}
fn to_json_string<Response>(op: &UserOperation, data: &Response) -> Result<String, LemmyError>
where
Response: Serialize,
{
let response = WebsocketResponse {
op: op.to_string(),
data,
};
Ok(serde_json::to_string(&response)?)
}