Rework Backend, models and items organization

TODO.md

@@ -4,6 +4,7 @@
   - Cleanup unused icons
 
 - Bug fixes
+  - dataclass-like `default_factory` for ListItem
   - Local echo messages all have the same time
   - Prevent briefly seeing login screen if there are accounts to
     resumeSession for but they take time to appear
@@ -47,6 +48,7 @@
   - Links preview
 
 - Client improvements
+  - nio.MatrixRoom has `typing_users`, no need to handle it on our own
   - Don't send setTypingState False when focus lost if nothing in sendbox
   - Initial sync filter and lazy load, see weechat-matrix `_handle_login()`
     - See also `handle_response()`'s `keys_query` request

harmonyqml/backend/backend.py

@@ -2,14 +2,17 @@
 # This file is part of harmonyqml, licensed under GPLv3.
 
 import os
+import random
 from concurrent.futures import ThreadPoolExecutor
-from typing import Deque, Dict, Optional, Sequence, Set
+from typing import Deque, Dict, Optional, Sequence, Set, Tuple
 
 from atomicfile import AtomicFile
 from PyQt5.QtCore import QObject, QStandardPaths, pyqtProperty, pyqtSlot
 
 from .html_filter import HtmlFilter
 from .model import ListModel, ListModelMap
+from .model.items import User
+from .network_manager import NioErrorResponse
 from .pyqt_future import futurize
 
 
@@ -18,8 +21,6 @@ class Backend(QObject):
         super().__init__(parent)
         self.pool: ThreadPoolExecutor = ThreadPoolExecutor(max_workers=6)
 
-        self._queried_displaynames: Dict[str, str] = {}
-
         self.past_tokens:        Dict[str, str] = {}
         self.fully_loaded_rooms: Set[str]       = set()
 
@@ -29,8 +30,16 @@ class Backend(QObject):
         self._client_manager: ClientManager = ClientManager(self)
 
         self._accounts: ListModel = ListModel(parent=parent)
-        self._room_events: ListModelMap = ListModelMap(Deque, parent)
+
-        self._devices:     ListModelMap = ListModelMap(parent=parent)
+        self._room_events: ListModelMap = ListModelMap(
+            container = Deque,
+            parent    = self
+        )
+
+        self._users: ListModel = ListModel(
+            default_factory = self._query_user,
+            parent          = self
+        )
 
         from .signal_manager import SignalManager
         self._signal_manager: SignalManager = SignalManager(self)
@@ -55,38 +64,31 @@ class Backend(QObject):
         return self._room_events
 
     @pyqtProperty("QVariant", constant=True)
-    def devices(self):
+    def users(self):
-        return self._devices
+        return self._users
 
     @pyqtProperty("QVariant", constant=True)
     def signals(self):
         return self._signal_manager
 
 
-    @pyqtSlot(str, result="QVariant")
+    def _query_user(self, user_id: str) -> User:
-    @pyqtSlot(str, bool, result="QVariant")
+        client = random.choice(tuple(self.clients.values()))  # nosec
-    @futurize(max_running=1, consider_args=True)
-    def getUserDisplayName(self, user_id: str, can_block: bool = True) -> str:
-        if user_id in self._queried_displaynames:
-            return self._queried_displaynames[user_id]
 
-        for client in self.clients.values():
+        @futurize(running_value=user_id)
-            for room in client.nio.rooms.values():
+        def get_displayname(self) -> str:
-                displayname = room.user_name(user_id)
+            print("querying", user_id)
-
+            try:
-                if displayname:
-                    return displayname
-
-        return self._query_user_displayname(user_id) if can_block else user_id
-
-
-    def _query_user_displayname(self, user_id: str) -> str:
-        client      = next(iter(self.clients.values()))
                 response = client.net.talk(client.nio.get_displayname, user_id)
-        displayname = getattr(response, "displayname", "") or user_id
+                return response.displayname or user_id
+            except NioErrorResponse:
+                return user_id
 
-        self._queried_displaynames[user_id] = displayname
+        return User(
-        return displayname
+            userId      = user_id,
+            displayName = get_displayname(self),
+            devices     = ListModel(),
+        )
 
 
     @pyqtSlot(str, result=float)
@@ -146,7 +148,7 @@ class Backend(QObject):
         cl = self.clients
         ac = self.accounts
         re = self.roomEvents
-        de = self.devices
+        us = self.users
 
         tcl = lambda user: cl[f"@test_{user}:matrix.org"]
 

harmonyqml/backend/client.py

@@ -28,7 +28,7 @@ class Client(QObject):
     roomSyncPrevBatchTokenReceived = pyqtSignal(str, str)
     roomPastPrevBatchTokenReceived = pyqtSignal(str, str)
     roomEventReceived              = pyqtSignal(str, str, dict)
-    roomTypingUsersUpdated         = pyqtSignal(str, list)
+    roomTypingMembersUpdated       = pyqtSignal(str, list)
 
     messageAboutToBeSent = pyqtSignal(str, dict)
 
@@ -208,7 +208,7 @@ class Client(QObject):
 
             for ev in room_info.ephemeral:
                 if isinstance(ev, nio.TypingNoticeEvent):
-                    self.roomTypingUsersUpdated.emit(room_id, ev.users)
+                    self.roomTypingMembersUpdated.emit(room_id, ev.users)
                 else:
                     print("ephemeral event: ", ev)
 

harmonyqml/backend/client_manager.py

@@ -2,11 +2,10 @@
 # This file is part of harmonyqt, licensed under GPLv3.
 
 import json
-import os
 import platform
 import threading
 from collections.abc import Mapping
-from typing import Dict, Iterable, Optional
+from typing import Dict
 
 from atomicfile import AtomicFile
 from PyQt5.QtCore import (

harmonyqml/backend/model/items.py

@@ -3,6 +3,7 @@ from typing import Any, Dict, List, Optional
 
 from PyQt5.QtCore import QDateTime, QSortFilterProxyModel
 
+from ..pyqt_future import PyQtFuture
 from .list_item import ListItem
 from .list_model import ListModel
 
@@ -13,19 +14,13 @@ class Account(ListItem):
 
     userId:         str       = ""
     roomCategories: ListModel = ListModel()
-    displayName:    Optional[str] = None
-    avatarUrl:      Optional[str] = None
-    statusMessage:  Optional[str] = None
 
 
 class RoomCategory(ListItem):
     _required_init_values = {"name", "rooms", "sortedRooms"}
-    _constant             = {"rooms", "sortedRooms"}
+    _constant             = {"name", "rooms", "sortedRooms"}
 
     name:        str                   = ""
-
-    # Must be provided at init, else it will be the same object
-    # for every RoomCategory
     rooms:       ListModel             = ListModel()
     sortedRooms: QSortFilterProxyModel = QSortFilterProxyModel()
 
@@ -37,13 +32,16 @@ class Room(ListItem):
     roomId:            str                 = ""
     displayName:       str                 = ""
     topic:             Optional[str]       = None
-    typingUsers:       List[str]           = []
     lastEventDateTime: Optional[QDateTime] = None
+    typingMembers:     List[str]           = []
+    members:           List[str]           = []
 
     inviter:   Optional[Dict[str, str]] = None
     leftEvent: Optional[Dict[str, str]] = None
 
 
+# ----------
+
 class RoomEvent(ListItem):
     _required_init_values = {"type", "dict"}
     _constant             = {"type"}
@@ -56,6 +54,20 @@ class RoomEvent(ListItem):
 
 # ----------
 
+class User(ListItem):
+    _required_init_values = {"userId", "devices"}
+    _constant             = {"userId", "devices"}
+
+    # Use PyQtFutures because the info might or might not need a request
+    # to be fetched, and we don't want to block the UI in any case.
+    # QML's property binding ability is used on the PyQtFuture.value
+    userId:         str                  = ""
+    displayName:    Optional[PyQtFuture] = None
+    avatarUrl:      Optional[PyQtFuture] = None
+    statusMessage:  Optional[PyQtFuture] = None
+    devices:        ListModel            = ListModel()
+
+
 class Trust(Enum):
     blacklisted = -1
     undecided   = 0

harmonyqml/backend/model/list_item.py

@@ -154,28 +154,19 @@ class ListItem(QObject, metaclass=_ListItemMeta):
 
 
     def __repr__(self) -> str:
-        from .list_model import ListModel
-        multiline = any((
-            isinstance(v, ListModel) for _, v in self._props.values()
-        ))
-
         prop_strings = (
-            "\033[{0}m{1}{2}={2}{3}\033[0m".format(
+            "\033[{0};34m{1}\033[0,{0}m = \033[{0};32m{2}\033[0m".format(
                 1 if p == self.mainKey else 0, # 1 = term bold
                 p,
-                " " if multiline else "",
+                repr(getattr(self, p))
-                getattr(self, p)
             ) for p in list(self._props.keys()) + self._direct_props
         )
 
-        if any((isinstance(v, ListModel) for _, v in self._props.values())):
+        return "\033[35m%s\033[0m(\n%s\n)" % (
-            return "%s(\n%s\n)" % (
             type(self).__name__,
             textwrap.indent(",\n".join(prop_strings), prefix=" " * 4)
         )
 
-        return "%s(%s)" % (type(self).__name__, ", ".join(prop_strings))
-
 
     @pyqtSlot(result=str)
     def repr(self) -> str:

harmonyqml/backend/model/list_model.py

@@ -32,19 +32,22 @@ class ListModel(QAbstractListModel):
     def __init__(self,
                  initial_data:    Optional[List[NewItem]]             = None,
                  container:       Callable[..., MutableSequence]      = list,
+                 default_factory: Optional[Callable[[str], ListItem]] = None,
                  parent:          QObject = None) -> None:
         super().__init__(parent)
         self._data: MutableSequence[ListItem] = container()
 
+        self.default_factory = default_factory
+
         if initial_data:
             self.extend(initial_data)
 
 
     def __repr__(self) -> str:
         if not self._data:
-            return "%s()" % type(self).__name__
+            return "\033[35m%s\033[0m()" % type(self).__name__
 
-        return "%s(\n%s\n)" % (
+        return "\033[35m%s\033[0m(\n%s\n)" % (
             type(self).__name__,
             textwrap.indent(
                 ",\n".join((repr(item) for item in self._data)),
@@ -56,7 +59,7 @@ class ListModel(QAbstractListModel):
     def __contains__(self, index: Index) -> bool:
         if isinstance(index, str):
             try:
-                self.indexWhere(self.mainKey, index)
+                self.indexWhere(index)
                 return True
             except ValueError:
                 return False
@@ -84,6 +87,10 @@ class ListModel(QAbstractListModel):
         return iter(self._data)
 
 
+    def __bool__(self) -> bool:
+        return bool(self._data)
+
+
     @pyqtSlot(result=str)
     def repr(self) -> str:
         return self.__repr__()
@@ -157,14 +164,22 @@ class ListModel(QAbstractListModel):
         return len(self)
 
 
-    @pyqtSlot(str, "QVariant", result=int)
+    @pyqtSlot("QVariant", result=int)
-    def indexWhere(self, prop: str, is_value: Any) -> int:
+    def indexWhere(self,
+                   main_key_is_value:        Any,
+                   _can_use_default_factory: bool = True) -> int:
+
         for i, item in enumerate(self._data):
-            if getattr(item, prop) == is_value:
+            if getattr(item, self.mainKey) == main_key_is_value:
                 return i
 
-        raise ValueError(f"No item in model data with "
+        if _can_use_default_factory and self.default_factory:
-                         f"property {prop!r} set to {is_value!r}.")
+            return self.append(self.default_factory(main_key_is_value))
+
+        raise ValueError(
+            f"No item in model data with "
+            f"property {self.mainKey} is set to {main_key_is_value!r}."
+        )
 
 
     @pyqtSlot(int, result="QVariant")
@@ -173,19 +188,25 @@ class ListModel(QAbstractListModel):
     @pyqtSlot(str, "QVariant", result="QVariant")
     def get(self, index: Index, default: Any = _GetFail()) -> ListItem:
         try:
-            i_index: int = self.indexWhere(self.mainKey, index) \
+            i_index: int = \
+                self.indexWhere(index, _can_use_default_factory=False) \
                 if isinstance(index, str) else index
 
             return self._data[i_index]
 
         except (ValueError, IndexError):
             if isinstance(default, _GetFail):
+                if self.default_factory and isinstance(index, str):
+                    item = self.default_factory(index)
+                    self.append(item)
+                    return item
                 raise
+
             return default
 
 
-    @pyqtSlot(int, "QVariantMap")
+    @pyqtSlot(int, "QVariantMap", result=int)
-    def insert(self, index: int, value: NewItem) -> None:
+    def insert(self, index: int, value: NewItem) -> int:
         value = self._convert_new_value(value)
 
         self.beginInsertRows(QModelIndex(), index, index)
@@ -199,11 +220,12 @@ class ListModel(QAbstractListModel):
 
         self.countChanged.emit(len(self))
         self.changed.emit()
+        return index
 
 
-    @pyqtSlot("QVariantMap")
+    @pyqtSlot("QVariantMap", result=int)
-    def append(self, value: NewItem) -> None:
+    def append(self, value: NewItem) -> int:
-        self.insert(len(self), value)
+        return self.insert(len(self), value)
 
 
     @pyqtSlot(list)
@@ -222,7 +244,7 @@ class ListModel(QAbstractListModel):
                ignore_roles: Sequence[str] = ()) -> int:
         value = self._convert_new_value(value)
 
-        i_index: int = self.indexWhere(self.mainKey, index) \
+        i_index: int = self.indexWhere(index, _can_use_default_factory=False) \
                        if isinstance(index, str) else index
 
         to_update = self[i_index]
@@ -272,7 +294,7 @@ class ListModel(QAbstractListModel):
     @pyqtSlot(int, list)
     @pyqtSlot(str, list)
     def set(self, index: Index, value: NewItem) -> None:
-        i_index: int = self.indexWhere(self.mainKey, index) \
+        i_index: int = self.indexWhere(index) \
                        if isinstance(index, str) else index
 
         qidx                = QAbstractListModel.index(self, i_index, 0)
@@ -285,7 +307,7 @@ class ListModel(QAbstractListModel):
     @pyqtSlot(int, str, "QVariant")
     @pyqtSlot(str, str, "QVariant")
     def setProperty(self, index: Index, prop: str, value: Any) -> None:
-        i_index: int = self.indexWhere(self.mainKey, index) \
+        i_index: int = self.indexWhere(index) \
                        if isinstance(index, str) else index
 
         if getattr(self[i_index], prop) != value:
@@ -301,7 +323,7 @@ class ListModel(QAbstractListModel):
     @pyqtSlot(str, int, int)
     def move(self, from_: Index, to: int, n: int = 1) -> None:
         # pylint: disable=invalid-name
-        i_from: int = self.indexWhere(self.mainKey, from_) \
+        i_from: int = self.indexWhere(from_) \
                       if isinstance(from_, str) else from_
 
         qlast = i_from + n - 1
@@ -332,7 +354,7 @@ class ListModel(QAbstractListModel):
     @pyqtSlot(int)
     @pyqtSlot(str)
     def remove(self, index: Index) -> None:
-        i_index: int = self.indexWhere(self.mainKey, index) \
+        i_index: int = self.indexWhere(index) \
                        if isinstance(index, str) else index
 
         self.beginRemoveRows(QModelIndex(), i_index, i_index)
@@ -347,7 +369,7 @@ class ListModel(QAbstractListModel):
     @pyqtSlot(str, result="QVariant")
     def pop(self, index: Index, default: Any = _PopFail()) -> ListItem:
         try:
-            i_index: int = self.indexWhere(self.mainKey, index) \
+            i_index: int = self.indexWhere(index) \
                            if isinstance(index, str) else index
             item = self[i_index]
 

harmonyqml/backend/model/list_model_map.py

@@ -1,4 +1,4 @@
-from typing import Any, Callable, DefaultDict, MutableSequence
+from typing import Any, DefaultDict
 
 from PyQt5.QtCore import QObject, pyqtSlot
 
@@ -6,15 +6,15 @@ from .list_model import ListModel
 
 
 class ListModelMap(QObject):
-    def __init__(self,
+    def __init__(self, *models_args, parent: QObject = None, **models_kwargs
-                 models_container: Callable[..., MutableSequence] = list,
+                ) -> None:
-                 parent:           QObject = None) -> None:
         super().__init__(parent)
+        models_kwargs["parent"] = self
 
         # Set the parent to prevent item garbage-collection on the C++ side
         self.dict: DefaultDict[Any, ListModel] = \
             DefaultDict(
-                lambda: ListModel(container=models_container, parent=self)
+                lambda: ListModel(*models_args, **models_kwargs)
             )
 
 

harmonyqml/backend/pyqt_future.py

@@ -7,7 +7,7 @@ import sys
 import time
 import traceback
 from concurrent.futures import Executor, Future
-from typing import Callable, Deque, Optional, Tuple, Union
+from typing import Any, Callable, Deque, Optional, Tuple, Union
 
 from PyQt5.QtCore import QObject, pyqtProperty, pyqtSignal, pyqtSlot
 
@@ -15,9 +15,13 @@ from PyQt5.QtCore import QObject, pyqtProperty, pyqtSignal, pyqtSlot
 class PyQtFuture(QObject):
     gotResult = pyqtSignal("QVariant")
 
-    def __init__(self, future: Future, parent: QObject) -> None:
+    def __init__(self,
+                 future:        Future,
+                 running_value: Any               = None,
+                 parent:        Optional[QObject] = None) -> None:
         super().__init__(parent)
         self.future        = future
+        self.running_value = running_value
         self._result       = None
 
         self.future.add_done_callback(
@@ -64,7 +68,7 @@ class PyQtFuture(QObject):
 
     @pyqtProperty("QVariant", notify=gotResult)
     def value(self):
-        return self.future.result() if self.done else None
+        return self.future.result() if self.done else self.running_value
 
 
     def add_done_callback(self, fn: Callable[[Future], None]) -> None:
@@ -79,7 +83,8 @@ _PENDING: Deque[_Task] = Deque()
 def futurize(max_running:            Optional[int] = None,
              consider_args:          bool          = False,
              discard_if_max_running: bool          = False,
-             pyqt:                   bool          = True) -> Callable:
+             pyqt:                   bool          = True,
+             running_value:          Any           = None) -> Callable:
 
     def decorator(func: Callable) -> Callable:
 
@@ -145,7 +150,9 @@ def futurize(max_running:            Optional[int] = None,
                     del _RUNNING[_RUNNING.index(task)]
 
             future = self.pool.submit(run_and_catch_errs)
-            return PyQtFuture(future, self) if pyqt else future
+            return PyQtFuture(
+                future=future, running_value=running_value, parent=self
+            ) if pyqt else future
 
         return wrapper
 

harmonyqml/backend/signal_manager.py

@@ -1,6 +1,7 @@
 # Copyright 2019 miruka
 # This file is part of harmonyqml, licensed under GPLv3.
 
+from concurrent.futures import ThreadPoolExecutor
 from threading import Lock
 from typing import Any, Deque, Dict, List, Optional
 
@@ -12,9 +13,10 @@ from nio.rooms import MatrixRoom
 from .backend import Backend
 from .client import Client
 from .model.items import (
-    Account, Device, ListModel, Room, RoomCategory, RoomEvent
+    Account, Device, ListModel, Room, RoomCategory, RoomEvent, User
 )
 from .model.sort_filter_proxy import SortFilterProxy
+from .pyqt_future import futurize
 
 Inviter   = Optional[Dict[str, str]]
 LeftEvent = Optional[Dict[str, str]]
@@ -27,6 +29,8 @@ class SignalManager(QObject):
 
     def __init__(self, backend: Backend) -> None:
         super().__init__(parent=backend)
+        self.pool: ThreadPoolExecutor = ThreadPoolExecutor(max_workers=6)
+
         self.backend = backend
 
         self.last_room_events:    Deque[str] = Deque(maxlen=1000)
@@ -37,7 +41,23 @@ class SignalManager(QObject):
 
 
     def onClientAdded(self, client: Client) -> None:
-        # Build an Account item for the Backend.accounts model
+        if client.userId in self.backend.accounts:
+            return
+
+        # An user might already exist in the model, e.g. if another account
+        # was in a room with the account that we just connected to
+        self.backend.users.upsert(
+            where_main_key_is = client.userId,
+            update_with       = User(
+                userId      = client.userId,
+                displayName = self.backend.users[client.userId].displayName,
+                # Devices are added later, we might need to upload keys before
+                # but we want to show the accounts ASAP in the client side pane
+                devices     = ListModel(),
+            )
+        )
+
+        # Backend.accounts
         room_categories_kwargs: List[Dict[str, Any]] = [
             {"name": "Invites", "rooms": ListModel()},
             {"name": "Rooms", "rooms": ListModel()},
@@ -57,25 +77,31 @@ class SignalManager(QObject):
             roomCategories = ListModel([
                 RoomCategory(**kws) for kws in room_categories_kwargs
             ]),
-            displayName = self.backend.getUserDisplayName(client.userId),
         ))
 
         # Upload our E2E keys to the matrix server if needed
         if not client.nio.olm_account_shared:
             client.uploadE2EKeys()
 
-        # Add our devices to the Backend.devices model
+        # Add all devices nio knows for this account
         store = client.nio.device_store
 
         for user_id in store.users:
-            self.backend.devices[user_id].clear()
+            user = self.backend.users.get(user_id, None)
-            self.backend.devices[user_id].extend([
+            if not user:
-                Device(
+                self.backend.users.append(
-                    deviceId   = dev.id,
+                    User(userId=user_id, devices=ListModel())
-                    ed25519Key = dev.ed25519,
+                )
-                    trust      = client.getDeviceTrust(dev),
+
-                ) for dev in store.active_user_devices(user_id)
+            for device in store.active_user_devices(user_id):
-            ])
+                self.backend.users[client.userId].devices.upsert(
+                    where_main_key_is = device.id,
+                    update_with       = Device(
+                        deviceId   = device.id,
+                        ed25519Key = device.ed25519,
+                        trust      = client.getDeviceTrust(device),
+                    )
+                )
 
         # Finally, connect all client signals
         self.connectClient(client)
@@ -107,12 +133,32 @@ class SignalManager(QObject):
         return None if name == "Empty room?" else name
 
 
+    def _add_users_from_nio_room(self, room: nio.rooms.MatrixRoom) -> None:
+        for user in room.users.values():
+            @futurize(running_value=user.display_name)
+            def get_displayname(self, user) -> str:
+                # pylint:disable=unused-argument
+                return user.display_name
+
+            self.backend.users.upsert(
+                where_main_key_is = user.user_id,
+                update_with       = User(
+                    userId      = user.user_id,
+                    displayName = get_displayname(self, user),
+                    devices     = ListModel()
+                ),
+                ignore_roles = ("devices",),
+            )
+
+
     def onRoomInvited(self,
                       client:  Client,
                       room_id: str,
                       inviter: Inviter = None) -> None:
 
         nio_room = client.nio.invited_rooms[room_id]
+        self._add_users_from_nio_room(nio_room)
+
         categories = self.backend.accounts[client.userId].roomCategories
 
         previous_room = categories["Rooms"].rooms.pop(room_id, None)
@@ -126,9 +172,9 @@ class SignalManager(QObject):
                 topic             = nio_room.topic,
                 inviter           = inviter,
                 lastEventDateTime = QDateTime.currentDateTime(),  # FIXME
+                members           = list(nio_room.users.keys()),
             ),
-            new_index_if_insert = 0,
+            ignore_roles = ("typingMembers"),
-            ignore_roles        = ("typingUsers"),
         )
 
         signal = self.roomCategoryChanged
@@ -140,6 +186,8 @@ class SignalManager(QObject):
 
     def onRoomJoined(self, client: Client, room_id: str) -> None:
         nio_room = client.nio.rooms[room_id]
+        self._add_users_from_nio_room(nio_room)
+
         categories = self.backend.accounts[client.userId].roomCategories
 
         previous_invite = categories["Invites"].rooms.pop(room_id, None)
@@ -151,9 +199,9 @@ class SignalManager(QObject):
                 roomId      = room_id,
                 displayName = self._get_room_displayname(nio_room),
                 topic       = nio_room.topic,
+                members     = list(nio_room.users.keys()),
             ),
-            new_index_if_insert = 0,
+            ignore_roles = ("typingMembers", "lastEventDateTime"),
-            ignore_roles        = ("typingUsers", "lastEventDateTime"),
         )
 
         signal = self.roomCategoryChanged
@@ -188,8 +236,7 @@ class SignalManager(QObject):
                     if left_time else QDateTime.currentDateTime()
                 ),
             ),
-            new_index_if_insert = 0,
+            ignore_roles = ("members", "lastEventDateTime"),
-            ignore_roles        = ("typingUsers", "lastEventDateTime"),
         )
 
         signal = self.roomCategoryChanged
@@ -304,14 +351,14 @@ class SignalManager(QObject):
                 self._set_room_last_event(client.userId, room_id, new_event)
 
 
-    def onRoomTypingUsersUpdated(self,
+    def onRoomTypingMembersUpdated(self,
                                    client:  Client,
                                    room_id: str,
                                    users:   List[str]) -> None:
         categories = self.backend.accounts[client.userId].roomCategories
         for categ in categories:
             try:
-                categ.rooms.setProperty(room_id, "typingUsers", users)
+                categ.rooms.setProperty(room_id, "typingMembers", users)
                 break
             except ValueError:
                 pass
@@ -355,9 +402,16 @@ class SignalManager(QObject):
                           user_id:     str,
                           device_id:   str,
                           ed25519_key: str) -> None:
+
         nio_device = client.nio.device_store[user_id][device_id]
 
-        self.backend.devices[user_id].upsert(
+        user = self.backend.users.get(user_id, None)
+        if not user:
+            self.backend.users.append(
+                User(userId=user_id, devices=ListModel())
+            )
+
+        self.backend.users[user_id].devices.upsert(
             where_main_key_is = device_id,
             update_with       = Device(
                 deviceId   = device_id,
@@ -369,4 +423,7 @@ class SignalManager(QObject):
 
     def onDeviceIsDeleted(self, _: Client, user_id: str, device_id: str
                          ) -> None:
-        self.backend.devices[user_id].pop(device_id, None)
+        try:
+            del self.backend.users[user_id].devices[device_id]
+        except ValueError:
+            pass

harmonyqml/components/Base/HAvatar.qml

@@ -2,16 +2,10 @@ import QtQuick 2.7
 import "../Base"
 
 Rectangle {
-    property bool hidden: false
+    property var name: null
-    property var name: null  // null, string or PyQtFuture
+    property var imageUrl: null
-    property var imageSource: null
     property int dimension: 36
-
+    property bool hidden: false
-
-    readonly property string resolvedName:
-        ! name ? "?" :
-        typeof(name) == "string" ? name :
-        (name.value ? name.value : "?")
 
     width: dimension
     height: hidden ? 1 : dimension
@@ -20,21 +14,21 @@ Rectangle {
 
     opacity: hidden ? 0 : 1
 
-    color: resolvedName === "?" ?
+    color: name ?
-           HStyle.avatar.background.unknown :
            Qt.hsla(
-               Backend.hueFromString(resolvedName),
+               Backend.hueFromString(name),
                HStyle.avatar.background.saturation,
                HStyle.avatar.background.lightness,
                HStyle.avatar.background.alpha
-            )
+           ) :
+           HStyle.avatar.background.unknown
 
     HLabel {
         z: 1
         anchors.centerIn: parent
         visible: ! hidden
 
-        text: resolvedName.charAt(0)
+        text: name ? name.charAt(0) : "?"
         color: HStyle.avatar.letter
         font.pixelSize: parent.height / 1.4
     }
@@ -42,9 +36,9 @@ Rectangle {
     HImage {
         z: 2
         anchors.fill: parent
-        visible: ! hidden && imageSource !== null
+        visible: ! hidden && imageUrl
 
-        Component.onCompleted: if (imageSource) {source = imageSource}
+        Component.onCompleted: if (imageUrl) { source = imageUrl }
         fillMode: Image.PreserveAspectCrop
         sourceSize.width: dimension
     }

harmonyqml/components/Base/HStyle.qml

@@ -96,7 +96,7 @@ QtObject {
             property color background: colors.background1
         }
 
-        readonly property QtObject typingUsers: QtObject {
+        readonly property QtObject typingMembers: QtObject {
             property color background: colors.background0
         }
 

harmonyqml/components/Chat/Banners/InviteBanner.qml

@@ -7,7 +7,7 @@ Banner {
     color: HStyle.chat.inviteBanner.background
 
     avatar.name: inviter ? inviter.displayname : ""
-    //avatar.imageSource: inviter ? inviter.avatar_url : ""
+    //avatar.imageUrl: inviter ? inviter.avatar_url : ""
 
     labelText:
         (inviter ?

harmonyqml/components/Chat/Chat.qml

@@ -14,8 +14,11 @@ HColumnLayout {
                .roomCategories.get(category)
                .rooms.get(roomId)
 
+    readonly property var sender: Backend.users.get(userId)
+
     readonly property bool hasUnknownDevices:
-         Backend.clients.get(userId).roomHasUnknownDevices(roomId)
+         category == "Rooms" ?
+         Backend.clients.get(userId).roomHasUnknownDevices(roomId) : false
 
     id: chatPage
     onFocusChanged: sendBox.setFocus()
@@ -38,7 +41,7 @@ HColumnLayout {
         Layout.fillHeight: true
     }
 
-    TypingUsersBar {}
+    TypingMembersBar {}
 
     InviteBanner {
         visible: category === "Invites"
@@ -46,12 +49,12 @@ HColumnLayout {
     }
 
     UnknownDevicesBanner {
-        visible: category === "Rooms" && hasUnknownDevices
+        visible: category == "Rooms" && hasUnknownDevices
     }
 
     SendBox {
         id: sendBox
-        visible: category === "Rooms" && ! hasUnknownDevices
+        visible: category == "Rooms" && ! hasUnknownDevices
     }
 
     LeftBanner {

harmonyqml/components/Chat/RoomEventList/EventContent.qml

@@ -16,7 +16,7 @@ Row {
 
     HAvatar {
         id: avatar
-        name: displayName
+        name: sender.displayName.value
         hidden: combine
         dimension: 28
     }
@@ -26,12 +26,12 @@ Row {
 
         id: contentLabel
         text: "<font color='" +
-              Qt.hsla(Backend.hueFromString(displayName.value || dict.sender),
+              Qt.hsla(Backend.hueFromString(sender.displayName.value),
                       HStyle.chat.event.saturation,
                       HStyle.chat.event.lightness,
                       1) +
               "'>" +
-              (displayName.value || dict.sender) + " " +
+              sender.displayName.value + " " +
               ChatJS.getEventText(type, dict) +
 
               "&nbsp;&nbsp;" +

harmonyqml/components/Chat/RoomEventList/MessageContent.qml

@@ -10,7 +10,7 @@ Row {
     HAvatar {
         id: avatar
         hidden: combine
-        name: displayName
+        name: sender.displayName.value
     }
 
     Rectangle {
@@ -37,7 +37,7 @@ Row {
                 visible: height > 0
 
                 id: nameLabel
-                text: displayName.value || dict.sender
+                text: sender.displayName.value
                 color: Qt.hsla(Backend.hueFromString(text),
                                HStyle.displayName.saturation,
                                HStyle.displayName.lightness,

harmonyqml/components/Chat/RoomEventList/RoomEventDelegate.qml

@@ -26,8 +26,7 @@ Column {
     readonly property bool isUndecryptableEvent:
         type === "OlmEvent" || type === "MegolmEvent"
 
-    readonly property var displayName:
+    readonly property var sender: Backend.users.get(dict.sender)
-        Backend.getUserDisplayName(dict.sender)
 
     readonly property bool isOwn:
         chatPage.userId === dict.sender

harmonyqml/components/Chat/SendBox.qml

@@ -18,7 +18,7 @@ HGlassRectangle {
 
         HAvatar {
             id: avatar
-            name: Backend.getUserDisplayName(chatPage.userId)
+            name: chatPage.sender.displayName.value
             dimension: root.Layout.minimumHeight
         }
 

harmonyqml/components/Chat/TypingMembersBar.qml

@@ -4,9 +4,9 @@ import "../Base"
 import "utils.js" as ChatJS
 
 HGlassRectangle {
-    property var typingUsers: chatPage.roomInfo.typingUsers
+    property var typingMembers: chatPage.roomInfo.typingMembers
 
-    color: HStyle.chat.typingUsers.background
+    color: HStyle.chat.typingMembers.background
 
     Layout.fillWidth: true
     Layout.minimumHeight: usersLabel.text ? usersLabel.implicitHeight : 0
@@ -16,7 +16,7 @@ HGlassRectangle {
         id: usersLabel
         anchors.fill: parent
 
-        text: ChatJS.getTypingUsersText(typingUsers, chatPage.userId)
+        text: ChatJS.getTypingMembersText(typingMembers, chatPage.userId)
         elide: Text.ElideMiddle
         maximumLineCount: 1
     }

harmonyqml/components/Chat/utils.js

@@ -84,9 +84,7 @@ function getHistoryVisibilityEventText(dict) {
 function getStateDisplayName(dict) {
     // The dict.content.displayname may be outdated, prefer
     // retrieving it fresh
-    var name = Backend.getUserDisplayName(dict.state_key, false)
+    return Backend.users.get(dict.state_key).displayName.value
-    return name === dict.state_key ?
-           dict.content.displayname : name.result()
 }
 
 
@@ -168,7 +166,7 @@ function getLeftBannerText(leftEvent) {
 
     if (info.membership)
 
-    var name = Backend.getUserDisplayName(leftEvent.sender, false).result()
+    var name = Backend.users.get(leftEvent.sender).displayName.value
 
     return "<b>" + name + "</b> " +
            (info.membership == "ban" ?
@@ -187,19 +185,19 @@ function getLeftBannerText(leftEvent) {
 
 function getLeftBannerAvatarName(leftEvent, accountId) {
     if (! leftEvent || leftEvent.state_key == leftEvent.sender) {
-        return Backend.getUserDisplayName(accountId, false).result()
+        return Backend.users.get(accountId).displayName.value
     }
 
-    return Backend.getUserDisplayName(leftEvent.sender, false).result()
+    return Backend.users.get(leftEvent.sender).displayName.value
 }
 
 
-function getTypingUsersText(users, ourAccountId) {
+function getTypingMembersText(users, ourAccountId) {
     var names = []
 
     for (var i = 0; i < users.length; i++) {
         if (users[i] !== ourAccountId) {
-            names.push(Backend.getUserDisplayName(users[i], false).result())
+            names.push(Backend.users.get(users[i]).displayName.value)
         }
     }
 

harmonyqml/components/SidePane/AccountDelegate.qml

@@ -6,6 +6,8 @@ Column {
     id: accountDelegate
     width: parent.width
 
+    property var user: Backend.users.get(userId)
+
     property string roomCategoriesListUserId: userId
     property bool expanded: true
 
@@ -16,7 +18,7 @@ Column {
 
         HAvatar {
             id: avatar
-            name: displayName
+            name: user.displayName.value
         }
 
         HColumnLayout {
@@ -25,7 +27,7 @@ Column {
 
             HLabel {
                 id: accountLabel
-                text: displayName.value || userId
+                text: user.displayName.value
                 elide: HLabel.ElideRight
                 maximumLineCount: 1
                 Layout.fillWidth: true
@@ -35,7 +37,7 @@ Column {
 
             HTextField {
                 id: statusEdit
-                text: statusMessage || ""
+                text: user.statusMessage || ""
                 placeholderText: qsTr("Set status message")
                 font.pixelSize: HStyle.fontSize.small
                 background: null

harmonyqml/components/SidePane/utils.js

@@ -6,7 +6,8 @@ function getLastRoomEventText(roomId, accountId) {
     if (eventsModel.count < 1) { return "" }
     var ev = eventsModel.get(0)
 
-    var name = Backend.getUserDisplayName(ev.dict.sender, false).result()
+    var name = Backend.users.get(ev.dict.sender).displayName.value
+
     var undecryptable = ev.type === "OlmEvent" || ev.type === "MegolmEvent"
 
     if (undecryptable || ev.type.startsWith("RoomMessage")) {