plugins: fix labels plugin FIXME re "just enabled plugin"

electrum/gui/qt/__init__.py

@@ -28,7 +28,7 @@ import signal
 import sys
 import traceback
 import threading
-from typing import Optional, TYPE_CHECKING
+from typing import Optional, TYPE_CHECKING, List
 
 
 try:
@@ -106,7 +106,7 @@ class ElectrumGui(Logger):
         self.config = config
         self.daemon = daemon
         self.plugins = plugins
-        self.windows = []
+        self.windows = []  # type: List[ElectrumWindow]
         self.efilter = OpenFileEventFilter(self.windows)
         self.app = QElectrumApplication(sys.argv)
         self.app.installEventFilter(self.efilter)

electrum/gui/qt/main_window.py

@@ -2951,6 +2951,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
             p = plugins.toggle(name)
             cb.setChecked(bool(p))
             enable_settings_widget(p, name, i)
+            # note: all enabled plugins will receive this hook:
             run_hook('init_qt', self.gui_object)
 
         for i, descr in enumerate(plugins.descriptions.values()):

electrum/plugins/cosigner_pool/qt.py

@@ -43,6 +43,7 @@ from electrum.gui.qt.transaction_dialog import show_transaction, TxDialog
 from electrum.gui.qt.util import WaitingDialog
 
 if TYPE_CHECKING:
+    from electrum.gui.qt import ElectrumGui
     from electrum.gui.qt.main_window import ElectrumWindow
 
 
@@ -101,9 +102,13 @@ class Plugin(BasePlugin):
         self.obj.cosigner_receive_signal.connect(self.on_receive)
         self.keys = []  # type: List[Tuple[str, str, ElectrumWindow]]
         self.cosigner_list = []  # type: List[Tuple[ElectrumWindow, str, bytes, str]]
+        self._init_qt_received = False
 
     @hook
-    def init_qt(self, gui):
+    def init_qt(self, gui: 'ElectrumGui'):
+        if self._init_qt_received:  # only need/want the first signal
+            return
+        self._init_qt_received = True
         for window in gui.windows:
             self.on_new_window(window)
 

electrum/plugins/labels/labels.py

@@ -3,7 +3,7 @@ import hashlib
 import json
 import sys
 import traceback
-from typing import Union
+from typing import Union, TYPE_CHECKING
 
 import base64
 
@@ -13,6 +13,9 @@ from electrum.i18n import _
 from electrum.util import log_exceptions, ignore_exceptions, make_aiohttp_session
 from electrum.network import Network
 
+if TYPE_CHECKING:
+    from electrum.wallet import Abstract_Wallet
+
 
 class ErrorConnectingServer(Exception):
     def __init__(self, reason: Union[str, Exception] = None):
@@ -152,6 +155,9 @@ class LabelsPlugin(BasePlugin):
         self.set_nonce(wallet, response["nonce"] + 1)
         self.on_pulled(wallet)
 
+    def on_pulled(self, wallet: 'Abstract_Wallet') -> None:
+        raise NotImplementedError()
+
     @ignore_exceptions
     @log_exceptions
     async def pull_safe_thread(self, wallet, force):

electrum/plugins/labels/qt.py

@@ -1,6 +1,7 @@
 from functools import partial
 import traceback
 import sys
+from typing import TYPE_CHECKING
 
 from PyQt5.QtCore import QObject, pyqtSignal
 from PyQt5.QtWidgets import (QHBoxLayout, QLabel, QVBoxLayout)
@@ -11,6 +12,10 @@ from electrum.gui.qt.util import ThreadedButton, Buttons, EnterButton, WindowMod
 
 from .labels import LabelsPlugin
 
+if TYPE_CHECKING:
+    from electrum.gui.qt import ElectrumGui
+    from electrum.gui.qt.main_window import ElectrumWindow
+    from electrum.wallet import Abstract_Wallet
 
 class QLabelsSignalObject(QObject):
     labels_changed_signal = pyqtSignal(object)
@@ -21,6 +26,7 @@ class Plugin(LabelsPlugin):
     def __init__(self, *args):
         LabelsPlugin.__init__(self, *args)
         self.obj = QLabelsSignalObject()
+        self._init_qt_received = False
 
     def requires_settings(self):
         return True
@@ -63,10 +69,17 @@ class Plugin(LabelsPlugin):
         dialog.show_error(_("Error synchronising labels") + f':\n{repr(exc_info[1])}')
 
     @hook
-    def load_wallet(self, wallet, window):
-        # FIXME if the user just enabled the plugin, this hook won't be called
-        # as the wallet is already loaded, and hence the plugin will be in
-        # a non-functional state for that window
+    def init_qt(self, gui: 'ElectrumGui'):
+        if self._init_qt_received:  # only need/want the first signal
+            return
+        self._init_qt_received = True
+        # If the user just enabled the plugin, the 'load_wallet' hook would not
+        # get called for already loaded wallets, hence we call it manually for those:
+        for window in gui.windows:
+            self.load_wallet(window.wallet, window)
+
+    @hook
+    def load_wallet(self, wallet: 'Abstract_Wallet', window: 'ElectrumWindow'):
         self.obj.labels_changed_signal.connect(window.update_tabs)
         self.start_wallet(wallet)