open-webui/backend/open_webui/socket/main.py

import asyncio
import random

import socketio
import logging
import sys
import time
from typing import Dict, Set
from redis import asyncio as aioredis
import pycrdt as Y

from open_webui.models.users import Users, UserNameResponse
from open_webui.models.channels import Channels
from open_webui.models.chats import Chats
from open_webui.models.notes import Notes, NoteUpdateForm
from open_webui.utils.redis import (
    get_sentinels_from_env,
    get_sentinel_url_from_env,
)

from open_webui.env import (
    ENABLE_WEBSOCKET_SUPPORT,
    WEBSOCKET_MANAGER,
    WEBSOCKET_REDIS_URL,
    WEBSOCKET_REDIS_LOCK_TIMEOUT,
    WEBSOCKET_SENTINEL_PORT,
    WEBSOCKET_SENTINEL_HOSTS,
)
from open_webui.utils.auth import decode_token
from open_webui.socket.utils import RedisDict, RedisLock
from open_webui.tasks import create_task, stop_item_tasks
from open_webui.utils.redis import get_redis_connection
from open_webui.utils.access_control import has_access, get_users_with_access


from open_webui.env import (
    GLOBAL_LOG_LEVEL,
    SRC_LOG_LEVELS,
)


logging.basicConfig(stream=sys.stdout, level=GLOBAL_LOG_LEVEL)
log = logging.getLogger(__name__)
log.setLevel(SRC_LOG_LEVELS["SOCKET"])


REDIS = get_redis_connection(
    redis_url=WEBSOCKET_REDIS_URL,
    redis_sentinels=get_sentinels_from_env(
        WEBSOCKET_SENTINEL_HOSTS, WEBSOCKET_SENTINEL_PORT
    ),
    async_mode=True,
)

if WEBSOCKET_MANAGER == "redis":
    if WEBSOCKET_SENTINEL_HOSTS:
        mgr = socketio.AsyncRedisManager(
            get_sentinel_url_from_env(
                WEBSOCKET_REDIS_URL, WEBSOCKET_SENTINEL_HOSTS, WEBSOCKET_SENTINEL_PORT
            )
        )
    else:
        mgr = socketio.AsyncRedisManager(WEBSOCKET_REDIS_URL)
    sio = socketio.AsyncServer(
        cors_allowed_origins=[],
        async_mode="asgi",
        transports=(["websocket"] if ENABLE_WEBSOCKET_SUPPORT else ["polling"]),
        allow_upgrades=ENABLE_WEBSOCKET_SUPPORT,
        always_connect=True,
        client_manager=mgr,
    )
else:
    sio = socketio.AsyncServer(
        cors_allowed_origins=[],
        async_mode="asgi",
        transports=(["websocket"] if ENABLE_WEBSOCKET_SUPPORT else ["polling"]),
        allow_upgrades=ENABLE_WEBSOCKET_SUPPORT,
        always_connect=True,
    )


# Timeout duration in seconds
TIMEOUT_DURATION = 3

# Dictionary to maintain the user pool

if WEBSOCKET_MANAGER == "redis":
    log.debug("Using Redis to manage websockets.")
    redis_sentinels = get_sentinels_from_env(
        WEBSOCKET_SENTINEL_HOSTS, WEBSOCKET_SENTINEL_PORT
    )
    SESSION_POOL = RedisDict(
        "open-webui:session_pool",
        redis_url=WEBSOCKET_REDIS_URL,
        redis_sentinels=redis_sentinels,
    )
    USER_POOL = RedisDict(
        "open-webui:user_pool",
        redis_url=WEBSOCKET_REDIS_URL,
        redis_sentinels=redis_sentinels,
    )
    USAGE_POOL = RedisDict(
        "open-webui:usage_pool",
        redis_url=WEBSOCKET_REDIS_URL,
        redis_sentinels=redis_sentinels,
    )

    # TODO: Implement Yjs document management with Redis
    DOCUMENTS = {}
    DOCUMENT_USERS = {}

    clean_up_lock = RedisLock(
        redis_url=WEBSOCKET_REDIS_URL,
        lock_name="usage_cleanup_lock",
        timeout_secs=WEBSOCKET_REDIS_LOCK_TIMEOUT,
        redis_sentinels=redis_sentinels,
    )
    aquire_func = clean_up_lock.aquire_lock
    renew_func = clean_up_lock.renew_lock
    release_func = clean_up_lock.release_lock
else:
    SESSION_POOL = {}
    USER_POOL = {}
    USAGE_POOL = {}

    DOCUMENTS = {}  # document_id -> Y.YDoc instance
    DOCUMENT_USERS = {}  # document_id -> set of user sids
    aquire_func = release_func = renew_func = lambda: True


async def periodic_usage_pool_cleanup():
    max_retries = 2
    retry_delay = random.uniform(
        WEBSOCKET_REDIS_LOCK_TIMEOUT / 2, WEBSOCKET_REDIS_LOCK_TIMEOUT
    )
    for attempt in range(max_retries + 1):
        if aquire_func():
            break
        else:
            if attempt < max_retries:
                log.debug(
                    f"Cleanup lock already exists. Retry {attempt + 1} after {retry_delay}s..."
                )
                await asyncio.sleep(retry_delay)
            else:
                log.warning(
                    "Failed to acquire cleanup lock after retries. Skipping cleanup."
                )
                return

    log.debug("Running periodic_cleanup")
    try:
        while True:
            if not renew_func():
                log.error(f"Unable to renew cleanup lock. Exiting usage pool cleanup.")
                raise Exception("Unable to renew usage pool cleanup lock.")

            now = int(time.time())
            send_usage = False
            for model_id, connections in list(USAGE_POOL.items()):
                # Creating a list of sids to remove if they have timed out
                expired_sids = [
                    sid
                    for sid, details in connections.items()
                    if now - details["updated_at"] > TIMEOUT_DURATION
                ]

                for sid in expired_sids:
                    del connections[sid]

                if not connections:
                    log.debug(f"Cleaning up model {model_id} from usage pool")
                    del USAGE_POOL[model_id]
                else:
                    USAGE_POOL[model_id] = connections

                send_usage = True
            await asyncio.sleep(TIMEOUT_DURATION)
    finally:
        release_func()


app = socketio.ASGIApp(
    sio,
    socketio_path="/ws/socket.io",
)


def get_models_in_use():
    # List models that are currently in use
    models_in_use = list(USAGE_POOL.keys())
    return models_in_use


def get_active_user_ids():
    """Get the list of active user IDs."""
    return list(USER_POOL.keys())


def get_user_active_status(user_id):
    """Check if a user is currently active."""
    return user_id in USER_POOL


def get_user_id_from_session_pool(sid):
    user = SESSION_POOL.get(sid)
    if user:
        return user["id"]
    return None


def get_user_ids_from_room(room):
    active_session_ids = sio.manager.get_participants(
        namespace="/",
        room=room,
    )

    active_user_ids = list(
        set(
            [SESSION_POOL.get(session_id[0])["id"] for session_id in active_session_ids]
        )
    )
    return active_user_ids


def get_active_status_by_user_id(user_id):
    if user_id in USER_POOL:
        return True
    return False


@sio.on("usage")
async def usage(sid, data):
    if sid in SESSION_POOL:
        model_id = data["model"]
        # Record the timestamp for the last update
        current_time = int(time.time())

        # Store the new usage data and task
        USAGE_POOL[model_id] = {
            **(USAGE_POOL[model_id] if model_id in USAGE_POOL else {}),
            sid: {"updated_at": current_time},
        }


@sio.event
async def connect(sid, environ, auth):
    user = None
    if auth and "token" in auth:
        data = decode_token(auth["token"])

        if data is not None and "id" in data:
            user = Users.get_user_by_id(data["id"])

        if user:
            SESSION_POOL[sid] = user.model_dump()
            if user.id in USER_POOL:
                USER_POOL[user.id] = USER_POOL[user.id] + [sid]
            else:
                USER_POOL[user.id] = [sid]


@sio.on("user-join")
async def user_join(sid, data):

    auth = data["auth"] if "auth" in data else None
    if not auth or "token" not in auth:
        return

    data = decode_token(auth["token"])
    if data is None or "id" not in data:
        return

    user = Users.get_user_by_id(data["id"])
    if not user:
        return

    SESSION_POOL[sid] = user.model_dump()
    if user.id in USER_POOL:
        USER_POOL[user.id] = USER_POOL[user.id] + [sid]
    else:
        USER_POOL[user.id] = [sid]

    # Join all the channels
    channels = Channels.get_channels_by_user_id(user.id)
    log.debug(f"{channels=}")
    for channel in channels:
        await sio.enter_room(sid, f"channel:{channel.id}")
    return {"id": user.id, "name": user.name}


@sio.on("join-channels")
async def join_channel(sid, data):
    auth = data["auth"] if "auth" in data else None
    if not auth or "token" not in auth:
        return

    data = decode_token(auth["token"])
    if data is None or "id" not in data:
        return

    user = Users.get_user_by_id(data["id"])
    if not user:
        return

    # Join all the channels
    channels = Channels.get_channels_by_user_id(user.id)
    log.debug(f"{channels=}")
    for channel in channels:
        await sio.enter_room(sid, f"channel:{channel.id}")


@sio.on("channel-events")
async def channel_events(sid, data):
    room = f"channel:{data['channel_id']}"
    participants = sio.manager.get_participants(
        namespace="/",
        room=room,
    )

    sids = [sid for sid, _ in participants]
    if sid not in sids:
        return

    event_data = data["data"]
    event_type = event_data["type"]

    if event_type == "typing":
        await sio.emit(
            "channel-events",
            {
                "channel_id": data["channel_id"],
                "message_id": data.get("message_id", None),
                "data": event_data,
                "user": UserNameResponse(**SESSION_POOL[sid]).model_dump(),
            },
            room=room,
        )


@sio.on("yjs:document:join")
async def yjs_document_join(sid, data):
    """Handle user joining a document"""
    user = SESSION_POOL.get(sid)

    try:
        document_id = data["document_id"]

        if document_id.startswith("note:"):
            note_id = document_id.split(":")[1]
            note = Notes.get_note_by_id(note_id)
            if not note:
                log.error(f"Note {note_id} not found")
                return

            if user.get("role") != "admin" and has_access(
                user.get("id"), type="read", access_control=note.access_control
            ):
                log.error(
                    f"User {user.get('id')} does not have access to note {note_id}"
                )
                return

        user_id = data.get("user_id", sid)
        user_name = data.get("user_name", "Anonymous")
        user_color = data.get("user_color", "#000000")

        log.info(f"User {user_id} joining document {document_id}")

        # Initialize document if it doesn't exist
        if document_id not in DOCUMENTS:
            DOCUMENTS[document_id] = {
                "ydoc": Y.Doc(),  # Create actual Yjs document
                "users": set(),
            }
            DOCUMENT_USERS[document_id] = set()

        # Add user to document
        DOCUMENTS[document_id]["users"].add(sid)
        DOCUMENT_USERS[document_id].add(sid)

        # Join Socket.IO room
        await sio.enter_room(sid, f"doc_{document_id}")

        # Send current document state as a proper Yjs update
        ydoc = DOCUMENTS[document_id]["ydoc"]

        # Encode the entire document state as an update
        state_update = ydoc.get_update()
        await sio.emit(
            "yjs:document:state",
            {
                "document_id": document_id,
                "state": list(state_update),  # Convert bytes to list for JSON
            },
            room=sid,
        )

        # Notify other users about the new user
        await sio.emit(
            "yjs:user:joined",
            {
                "document_id": document_id,
                "user_id": user_id,
                "user_name": user_name,
                "user_color": user_color,
            },
            room=f"doc_{document_id}",
            skip_sid=sid,
        )

        log.info(f"User {user_id} successfully joined document {document_id}")

    except Exception as e:
        log.error(f"Error in yjs_document_join: {e}")
        await sio.emit("error", {"message": "Failed to join document"}, room=sid)


async def document_save_handler(document_id, data, user):
    if document_id.startswith("note:"):
        note_id = document_id.split(":")[1]
        note = Notes.get_note_by_id(note_id)
        if not note:
            log.error(f"Note {note_id} not found")
            return

        if user.get("role") != "admin" and has_access(
            user.get("id"), type="read", access_control=note.access_control
        ):
            log.error(f"User {user.get('id')} does not have access to note {note_id}")
            return

        Notes.update_note_by_id(note_id, NoteUpdateForm(data=data))


@sio.on("yjs:document:update")
async def yjs_document_update(sid, data):
    """Handle Yjs document updates"""
    try:
        document_id = data["document_id"]
        await stop_item_tasks(REDIS, document_id)

        user_id = data.get("user_id", sid)
        update = data["update"]  # List of bytes from frontend

        if document_id not in DOCUMENTS:
            log.warning(f"Document {document_id} not found")
            return

        # Apply the update to the server's Yjs document
        ydoc = DOCUMENTS[document_id]["ydoc"]
        update_bytes = bytes(update)

        try:
            ydoc.apply_update(update_bytes)
        except Exception as e:
            log.error(f"Failed to apply Yjs update: {e}")
            return

        # Broadcast update to all other users in the document
        await sio.emit(
            "yjs:document:update",
            {
                "document_id": document_id,
                "user_id": user_id,
                "update": update,
                "socket_id": sid,  # Add socket_id to match frontend filtering
            },
            room=f"doc_{document_id}",
            skip_sid=sid,
        )

        async def debounced_save():
            await asyncio.sleep(0.5)
            await document_save_handler(
                document_id, data.get("data", {}), SESSION_POOL.get(sid)
            )

        await stop_item_tasks(REDIS, document_id)  # Cancel previous in-flight save
        await create_task(REDIS, debounced_save(), document_id)

    except Exception as e:
        log.error(f"Error in yjs_document_update: {e}")


@sio.on("yjs:document:leave")
async def yjs_document_leave(sid, data):
    """Handle user leaving a document"""
    try:
        document_id = data["document_id"]
        user_id = data.get("user_id", sid)

        log.info(f"User {user_id} leaving document {document_id}")

        if document_id in DOCUMENTS:
            DOCUMENTS[document_id]["users"].discard(sid)

        if document_id in DOCUMENT_USERS:
            DOCUMENT_USERS[document_id].discard(sid)

        # Leave Socket.IO room
        await sio.leave_room(sid, f"doc_{document_id}")

        # Notify other users
        await sio.emit(
            "yjs:user:left",
            {"document_id": document_id, "user_id": user_id},
            room=f"doc_{document_id}",
        )

        if document_id in DOCUMENTS and not DOCUMENTS[document_id]["users"]:
            # If no users left, clean up the document
            log.info(f"Cleaning up document {document_id} as no users are left")
            del DOCUMENTS[document_id]
            del DOCUMENT_USERS[document_id]

    except Exception as e:
        log.error(f"Error in yjs_document_leave: {e}")


@sio.on("yjs:awareness:update")
async def yjs_awareness_update(sid, data):
    """Handle awareness updates (cursors, selections, etc.)"""
    try:
        document_id = data["document_id"]
        user_id = data.get("user_id", sid)
        update = data["update"]

        # Broadcast awareness update to all other users in the document
        await sio.emit(
            "yjs:awareness:update",
            {"document_id": document_id, "user_id": user_id, "update": update},
            room=f"doc_{document_id}",
            skip_sid=sid,
        )

    except Exception as e:
        log.error(f"Error in yjs_awareness_update: {e}")


@sio.event
async def disconnect(sid):
    if sid in SESSION_POOL:
        user = SESSION_POOL[sid]
        del SESSION_POOL[sid]

        user_id = user["id"]
        USER_POOL[user_id] = [_sid for _sid in USER_POOL[user_id] if _sid != sid]

        if len(USER_POOL[user_id]) == 0:
            del USER_POOL[user_id]
    else:
        pass
        # print(f"Unknown session ID {sid} disconnected")


def get_event_emitter(request_info, update_db=True):
    async def __event_emitter__(event_data):
        user_id = request_info["user_id"]

        session_ids = list(
            set(
                USER_POOL.get(user_id, [])
                + (
                    [request_info.get("session_id")]
                    if request_info.get("session_id")
                    else []
                )
            )
        )

        emit_tasks = [
            sio.emit(
                "chat-events",
                {
                    "chat_id": request_info.get("chat_id", None),
                    "message_id": request_info.get("message_id", None),
                    "data": event_data,
                },
                to=session_id,
            )
            for session_id in session_ids
        ]

        await asyncio.gather(*emit_tasks)

        if update_db:
            if "type" in event_data and event_data["type"] == "status":
                Chats.add_message_status_to_chat_by_id_and_message_id(
                    request_info["chat_id"],
                    request_info["message_id"],
                    event_data.get("data", {}),
                )

            if "type" in event_data and event_data["type"] == "message":
                message = Chats.get_message_by_id_and_message_id(
                    request_info["chat_id"],
                    request_info["message_id"],
                )

                if message:
                    content = message.get("content", "")
                    content += event_data.get("data", {}).get("content", "")

                    Chats.upsert_message_to_chat_by_id_and_message_id(
                        request_info["chat_id"],
                        request_info["message_id"],
                        {
                            "content": content,
                        },
                    )

            if "type" in event_data and event_data["type"] == "replace":
                content = event_data.get("data", {}).get("content", "")

                Chats.upsert_message_to_chat_by_id_and_message_id(
                    request_info["chat_id"],
                    request_info["message_id"],
                    {
                        "content": content,
                    },
                )

    return __event_emitter__


def get_event_call(request_info):
    async def __event_caller__(event_data):
        response = await sio.call(
            "chat-events",
            {
                "chat_id": request_info.get("chat_id", None),
                "message_id": request_info.get("message_id", None),
                "data": event_data,
            },
            to=request_info["session_id"],
        )
        return response

    return __event_caller__


get_event_caller = get_event_call