moment/src/backend/backend.py

import asyncio
import logging as log
from pathlib import Path
from typing import Any, Callable, DefaultDict, Dict, List, Optional, Tuple

import hsluv

import nio

from .app import App
from .errors import MatrixError
from .matrix_client import MatrixClient
from .models.items import Account, Device, Event, Member, Room, Upload
from .models.model_store import ModelStore


class Backend:
    def __init__(self, app: App) -> None:
        self.app = app

        from . import config_files
        self.saved_accounts = config_files.Accounts(self)
        self.ui_settings    = config_files.UISettings(self)
        self.ui_state       = config_files.UIState(self)
        self.history        = config_files.History(self)

        self.models = ModelStore(allowed_key_types={
            Account,             # Logged-in accounts
            (Device, str),       # Devices of user_id
            (Room,   str),       # Rooms for user_id
            (Upload, str),       # Uploads running in room_id
            (Member, str, str),  # Members for account user_id for room_id
            (Event,  str, str),  # Events for account user_id for room_id
        })

        self.clients: Dict[str, MatrixClient] = {}

        self.profile_cache: Dict[str, nio.ProfileGetResponse] = {}
        self.get_profile_locks: DefaultDict[str, asyncio.Lock] = \
                DefaultDict(asyncio.Lock)  # {user_id: lock}

        self.send_locks: DefaultDict[str, asyncio.Lock] = \
                DefaultDict(asyncio.Lock)  # {room_id: lock}

        from .media_cache import MediaCache
        cache_dir        = Path(self.app.appdirs.user_cache_dir)
        self.media_cache = MediaCache(self, cache_dir)


    def __repr__(self) -> str:
        return f"{type(self).__name__}(clients={self.clients!r})"


    # Clients management

    async def login_client(self,
        user:       str,
        password:   str,
        device_id:  Optional[str] = None,
        homeserver: str           = "https://matrix.org",
   ) -> str:

        client = MatrixClient(
            self, user=user, homeserver=homeserver, device_id=device_id,
        )

        try:
            await client.login(password)
        except MatrixError:
            await client.close()
            raise

        self.clients[client.user_id]         = client
        self.models[Account][client.user_id] = Account(client.user_id)
        return client.user_id


    async def resume_client(self,
                            user_id:    str,
                            token:      str,
                            device_id:  str,
                            homeserver: str = "https://matrix.org") -> None:

        client = MatrixClient(
            backend=self,
            user=user_id, homeserver=homeserver, device_id=device_id,
        )

        self.clients[user_id]         = client
        self.models[Account][user_id] = Account(user_id)

        await client.resume(user_id=user_id, token=token, device_id=device_id)


    async def load_saved_accounts(self) -> Tuple[str, ...]:
        async def resume(user_id: str, info: Dict[str, str]) -> str:
            await self.resume_client(
                user_id    = user_id,
                token      = info["token"],
                device_id  = info["device_id"],
                homeserver = info["homeserver"],
            )
            return user_id

        return await asyncio.gather(*(
            resume(uid, info)
            for uid, info in (await self.saved_accounts.read()).items()
        ))


    async def logout_client(self, user_id: str) -> None:
        client = self.clients.pop(user_id, None)
        if client:
            self.models[Account].pop(user_id, None)
            await client.logout()

        await self.saved_accounts.delete(user_id)


    async def wait_until_client_exists(self, user_id: str) -> None:
        loops = 0
        while True:
            if user_id in self.clients:
                return

            if loops and loops % 100 == 0:  # every 10s except first time
                log.warning("Waiting for account %s to exist, %ds passed",
                            user_id, loops // 10)

            await asyncio.sleep(0.1)
            loops += 1


    # General functions

    @staticmethod
    def hsluv(hue: int, saturation: int, lightness: int) -> List[float]:
        # (0-360, 0-100, 0-100) -> [0-1, 0-1, 0-1]
        return hsluv.hsluv_to_rgb([hue, saturation, lightness])


    async def load_settings(self) -> tuple:
        from .config_files import Theme
        settings = await self.ui_settings.read()
        ui_state = await self.ui_state.read()
        history  = await self.history.read()
        theme    = await Theme(self, settings["theme"]).read()

        return (settings, ui_state, history, theme)


    async def get_flat_mainpane_data(self) -> List[Dict[str, Any]]:
        data = []

        for account in sorted(self.models[Account].values()):
            data.append({
                "type":    "Account",
                "id":      account.user_id,
                "user_id": account.user_id,
                "data":    account.serialized,
            })

            for room in sorted(self.models[Room, account.user_id].values()):
                data.append({
                    "type":    "Room",
                    "id":      "/".join((account.user_id, room.room_id)),
                    "user_id": account.user_id,
                    "data":    room.serialized,
                })

        return data


    # Client functions that don't need authentification

    async def _any_client(self, caller: Callable, *args, **kw) -> MatrixClient:
        failures = 0

        while True:
            for client in self.clients.values():
                if client.syncing:
                    return client

            await asyncio.sleep(0.1)
            failures += 1

            if failures and failures % 300 == 0:
                log.warn(
                    "No syncing client found after %ds of wait for %s %r %r",
                    failures / 10, caller.__name__, args, kw,
                )


    async def get_profile(self, user_id: str) -> nio.ProfileGetResponse:
        if user_id in self.profile_cache:
            return self.profile_cache[user_id]

        async with self.get_profile_locks[user_id]:
            client   = await self._any_client(self.get_profile, user_id)
            response = await client.get_profile(user_id)

            if isinstance(response, nio.ProfileGetError):
                raise MatrixError.from_nio(response)

            self.profile_cache[user_id] = response
            return response


    async def thumbnail(
        self, server_name: str, media_id: str, width: int, height: int,
    ) -> nio.ThumbnailResponse:

        args     = (server_name, media_id, width, height)
        client   = await self._any_client(self.thumbnail, *args)
        response = await client.thumbnail(*args)

        if isinstance(response, nio.ThumbnailError):
            raise MatrixError.from_nio(response)

        return response


    async def download(
        self, server_name: str, media_id: str,
    ) -> nio.DownloadResponse:

        client   = await self._any_client(self.download, server_name, media_id)
        response = await client.download(server_name, media_id)

        if isinstance(response, nio.DownloadError):
            raise MatrixError.from_nio(response)

        return response