AppFlowy/rust-lib/flowy-sdk/src/deps_resolve/document_deps.rs

use bytes::Bytes;
use flowy_document::{
    errors::DocError,
    module::DocumentUser,
    prelude::{WsDocument, WsDocumentMessage, WsSender, WS_ID},
};
use flowy_user::services::user::UserSession;
use flowy_ws::{WsMessage, WsMessageHandler};
use parking_lot::RwLock;
use std::{path::Path, sync::Arc};

pub struct DocumentDepsResolver {
    user_session: Arc<UserSession>,
}

impl DocumentDepsResolver {
    pub fn new(user_session: Arc<UserSession>) -> Self { Self { user_session } }

    pub fn split_into(self) -> (Arc<dyn DocumentUser>, Arc<RwLock<WsDocument>>) {
        let user = Arc::new(DocumentUserImpl {
            user: self.user_session.clone(),
        });

        let sender = Arc::new(WsSenderImpl {
            user: self.user_session.clone(),
        });

        let ws = Arc::new(RwLock::new(WsDocument::new(sender.clone())));

        let ws_handler = Arc::new(WsDocumentResolver {
            user: self.user_session.clone(),
            inner: ws.clone(),
        });

        self.user_session.add_ws_handler(ws_handler);

        (user, ws)
    }
}

struct DocumentUserImpl {
    user: Arc<UserSession>,
}

impl DocumentUser for DocumentUserImpl {
    fn user_dir(&self) -> Result<String, DocError> {
        let dir = self.user.user_dir().map_err(|e| DocError::unauthorized().context(e))?;

        let doc_dir = format!("{}/doc", dir);
        if !Path::new(&doc_dir).exists() {
            let _ = std::fs::create_dir_all(&doc_dir)?;
        }
        Ok(doc_dir)
    }

    fn user_id(&self) -> Result<String, DocError> { self.user.user_id().map_err(|e| DocError::internal().context(e)) }

    fn token(&self) -> Result<String, DocError> { self.user.token().map_err(|e| DocError::internal().context(e)) }
}

struct WsSenderImpl {
    user: Arc<UserSession>,
}

impl WsSender for WsSenderImpl {
    fn send_msg(&self, msg: WsDocumentMessage) -> Result<(), DocError> {
        let msg = WsMessage {
            source: WS_ID.clone(),
            data: msg.0.to_vec(),
        };
        let _ = self.user.send_ws_msg(msg).map_err(|e| DocError::internal().context(e))?;
        Ok(())
    }
}

struct WsDocumentResolver {
    user: Arc<UserSession>,
    inner: Arc<RwLock<WsDocument>>,
}

impl WsMessageHandler for WsDocumentResolver {
    fn source(&self) -> String { WS_ID.clone() }

    fn receive_message(&self, msg: WsMessage) {
        let msg = WsDocumentMessage(Bytes::from(msg.data));

        self.inner.read().receive_msg(msg);
    }
}