hww: rm some code duplication: add "scan_and_create_client_for_device"

electrum/plugins/coldcard/coldcard.py

@@ -522,22 +522,15 @@ class ColdcardPlugin(HW_PluginBase):
             return None
 
     def setup_device(self, device_info, wizard, purpose):
-        devmgr = self.device_manager()
         device_id = device_info.device.id_
-        client = devmgr.client_by_id(device_id)
-        if client is None:
-            raise UserFacingException(_('Failed to create a client for this device.') + '\n' +
-                                      _('Make sure it is in the correct state.'))
-        client.handler = self.create_handler(wizard)
+        client = self.scan_and_create_client_for_device(device_id=device_id, wizard=wizard)
 
     def get_xpub(self, device_id, derivation, xtype, wizard):
         # this seems to be part of the pairing process only, not during normal ops?
         # base_wizard:on_hw_derivation
         if xtype not in self.SUPPORTED_XTYPES:
             raise ScriptTypeNotSupported(_('This type of script is not supported with {}.').format(self.device))
-        devmgr = self.device_manager()
-        client = devmgr.client_by_id(device_id)
-        client.handler = self.create_handler(wizard)
+        client = self.scan_and_create_client_for_device(device_id=device_id, wizard=wizard)
         client.ping_check()
 
         xpub = client.get_xpub(derivation, xtype)

electrum/plugins/digitalbitbox/digitalbitbox.py

@@ -703,13 +703,8 @@ class DigitalBitboxPlugin(HW_PluginBase):
 
 
     def setup_device(self, device_info, wizard, purpose):
-        devmgr = self.device_manager()
         device_id = device_info.device.id_
-        client = devmgr.client_by_id(device_id)
-        if client is None:
-            raise Exception(_('Failed to create a client for this device.') + '\n' +
-                            _('Make sure it is in the correct state.'))
-        client.handler = self.create_handler(wizard)
+        client = self.scan_and_create_client_for_device(device_id=device_id, wizard=wizard)
         if purpose == HWD_SETUP_NEW_WALLET:
             client.setupRunning = True
         client.get_xpub("m/44'/0'", 'standard')
@@ -739,9 +734,7 @@ class DigitalBitboxPlugin(HW_PluginBase):
             raise ScriptTypeNotSupported(_('This type of script is not supported with {}.').format(self.device))
         if is_all_public_derivation(derivation):
             raise Exception(f"The {self.device} does not reveal xpubs corresponding to non-hardened paths. (path: {derivation})")
-        devmgr = self.device_manager()
-        client = devmgr.client_by_id(device_id)
-        client.handler = self.create_handler(wizard)
+        client = self.scan_and_create_client_for_device(device_id=device_id, wizard=wizard)
         client.check_device_dialog()
         xpub = client.get_xpub(derivation, xtype)
         return xpub

electrum/plugins/hw_wallet/plugin.py

@@ -65,6 +65,15 @@ class HW_PluginBase(BasePlugin):
             if isinstance(keystore, self.keystore_class):
                 self.device_manager().unpair_xpub(keystore.xpub)
 
+    def scan_and_create_client_for_device(self, *, device_id: str, wizard: 'BaseWizard') -> 'HardwareClientBase':
+        devmgr = self.device_manager()
+        client = devmgr.client_by_id(device_id)
+        if client is None:
+            raise UserFacingException(_('Failed to create a client for this device.') + '\n' +
+                                      _('Make sure it is in the correct state.'))
+        client.handler = self.create_handler(wizard)
+        return client
+
     def setup_device(self, device_info: DeviceInfo, wizard: 'BaseWizard', purpose):
         """Called when creating a new wallet or when using the device to decrypt
         an existing wallet. Select the device to use.  If the device is

electrum/plugins/keepkey/keepkey.py

@@ -275,13 +275,8 @@ class KeepKeyPlugin(HW_PluginBase):
         return self.types.HDNodePathType(node=node, address_n=address_n)
 
     def setup_device(self, device_info, wizard, purpose):
-        devmgr = self.device_manager()
         device_id = device_info.device.id_
-        client = devmgr.client_by_id(device_id)
-        if client is None:
-            raise UserFacingException(_('Failed to create a client for this device.') + '\n' +
-                                      _('Make sure it is in the correct state.'))
-        client.handler = self.create_handler(wizard)
+        client = self.scan_and_create_client_for_device(device_id=device_id, wizard=wizard)
         if not device_info.initialized:
             self.initialize_device(device_id, wizard, client.handler)
         client.get_xpub('m', 'standard')
@@ -290,9 +285,7 @@ class KeepKeyPlugin(HW_PluginBase):
     def get_xpub(self, device_id, derivation, xtype, wizard):
         if xtype not in self.SUPPORTED_XTYPES:
             raise ScriptTypeNotSupported(_('This type of script is not supported with {}.').format(self.device))
-        devmgr = self.device_manager()
-        client = devmgr.client_by_id(device_id)
-        client.handler = self.create_handler(wizard)
+        client = self.scan_and_create_client_for_device(device_id=device_id, wizard=wizard)
         xpub = client.get_xpub(derivation, xtype)
         client.used()
         return xpub

electrum/plugins/ledger/ledger.py

@@ -589,21 +589,14 @@ class LedgerPlugin(HW_PluginBase):
         return client
 
     def setup_device(self, device_info, wizard, purpose):
-        devmgr = self.device_manager()
         device_id = device_info.device.id_
-        client = devmgr.client_by_id(device_id)
-        if client is None:
-            raise UserFacingException(_('Failed to create a client for this device.') + '\n' +
-                                      _('Make sure it is in the correct state.'))
-        client.handler = self.create_handler(wizard)
+        client = self.scan_and_create_client_for_device(device_id=device_id, wizard=wizard)
         client.get_xpub("m/44'/0'", 'standard') # TODO replace by direct derivation once Nano S > 1.1
 
     def get_xpub(self, device_id, derivation, xtype, wizard):
         if xtype not in self.SUPPORTED_XTYPES:
             raise ScriptTypeNotSupported(_('This type of script is not supported with {}.').format(self.device))
-        devmgr = self.device_manager()
-        client = devmgr.client_by_id(device_id)
-        client.handler = self.create_handler(wizard)
+        client = self.scan_and_create_client_for_device(device_id=device_id, wizard=wizard)
         client.checkDevice()
         xpub = client.get_xpub(derivation, xtype)
         return xpub

electrum/plugins/safe_t/safe_t.py

@@ -249,13 +249,8 @@ class SafeTPlugin(HW_PluginBase):
         return self.types.HDNodePathType(node=node, address_n=address_n)
 
     def setup_device(self, device_info, wizard, purpose):
-        devmgr = self.device_manager()
         device_id = device_info.device.id_
-        client = devmgr.client_by_id(device_id)
-        if client is None:
-            raise UserFacingException(_('Failed to create a client for this device.') + '\n' +
-                                      _('Make sure it is in the correct state.'))
-        client.handler = self.create_handler(wizard)
+        client = self.scan_and_create_client_for_device(device_id=device_id, wizard=wizard)
         if not device_info.initialized:
             self.initialize_device(device_id, wizard, client.handler)
         client.get_xpub('m', 'standard')
@@ -264,9 +259,7 @@ class SafeTPlugin(HW_PluginBase):
     def get_xpub(self, device_id, derivation, xtype, wizard):
         if xtype not in self.SUPPORTED_XTYPES:
             raise ScriptTypeNotSupported(_('This type of script is not supported with {}.').format(self.device))
-        devmgr = self.device_manager()
-        client = devmgr.client_by_id(device_id)
-        client.handler = self.create_handler(wizard)
+        client = self.scan_and_create_client_for_device(device_id=device_id, wizard=wizard)
         xpub = client.get_xpub(derivation, xtype)
         client.used()
         return xpub

electrum/plugins/trezor/trezor.py

@@ -268,12 +268,8 @@ class TrezorPlugin(HW_PluginBase):
         return HDNodePathType(node=node, address_n=address_n)
 
     def setup_device(self, device_info, wizard, purpose):
-        devmgr = self.device_manager()
         device_id = device_info.device.id_
-        client = devmgr.client_by_id(device_id)
-        if client is None:
-            raise UserFacingException(_('Failed to create a client for this device.') + '\n' +
-                                      _('Make sure it is in the correct state.'))
+        client = self.scan_and_create_client_for_device(device_id=device_id, wizard=wizard)
 
         if not client.is_uptodate():
             msg = (_('Outdated {} firmware for device labelled {}. Please '
@@ -281,7 +277,6 @@ class TrezorPlugin(HW_PluginBase):
                    .format(self.device, client.label(), self.firmware_URL))
             raise OutdatedHwFirmwareException(msg)
 
-        client.handler = self.create_handler(wizard)
         if not device_info.initialized:
             self.initialize_device(device_id, wizard, client.handler)
         is_creating_wallet = purpose == HWD_SETUP_NEW_WALLET
@@ -291,9 +286,7 @@ class TrezorPlugin(HW_PluginBase):
     def get_xpub(self, device_id, derivation, xtype, wizard):
         if xtype not in self.SUPPORTED_XTYPES:
             raise ScriptTypeNotSupported(_('This type of script is not supported with {}.').format(self.device))
-        devmgr = self.device_manager()
-        client = devmgr.client_by_id(device_id)
-        client.handler = self.create_handler(wizard)
+        client = self.scan_and_create_client_for_device(device_id=device_id, wizard=wizard)
         xpub = client.get_xpub(derivation, xtype)
         client.used()
         return xpub