Remove constructor method of plugins

Clean up wallet class loading.

plugins/ledger/ledger.py

@@ -419,9 +419,6 @@ class LedgerPlugin(BasePlugin):
         self.device = self.wallet_class.device
         self.handler = None
 
-    def constructor(self, s):
-        return BTChipWallet(s)
-
     def is_enabled(self):
         return BTCHIP
 

plugins/trezor/plugin.py

@@ -129,9 +129,6 @@ class TrezorCompatiblePlugin(BasePlugin):
         self.client = None
         self.wallet_class.plugin = self
 
-    def constructor(self, s):
-        return self.wallet_class(s)
-
     def give_error(self, message):
         self.print_error(message)
         raise Exception(message)

plugins/trustedcoin/qt.py

@@ -31,7 +31,7 @@ from electrum.i18n import _
 from electrum.plugins import hook
 from electrum import wizard
 
-from trustedcoin import TrustedCoinPlugin, Wallet_2fa, DISCLAIMER, server
+from trustedcoin import TrustedCoinPlugin, DISCLAIMER, server
 
 def need_server(wallet, tx):
     from electrum.account import BIP32_Account
@@ -79,7 +79,8 @@ class Plugin(TrustedCoinPlugin):
     def sign_tx(self, window, tx):
         self.print_error("twofactor:sign_tx")
         wallet = window.wallet
-        if type(wallet) is Wallet_2fa and not wallet.can_sign_without_server():
+        assert isinstace(wallet, self.wallet_class)
+        if not wallet.can_sign_without_server():
             auth_code = None
             if need_server(wallet, tx):
                 auth_code = self.auth_dialog(window)
@@ -100,7 +101,8 @@ class Plugin(TrustedCoinPlugin):
     @hook
     def abort_send(self, window):
         wallet = window.wallet
-        if type(wallet) is Wallet_2fa and not wallet.can_sign_without_server():
+        assert isinstace(wallet, self.wallet_class)
+        if not wallet.can_sign_without_server():
             if wallet.billing_info is None:
                 # request billing info before forming the transaction
                 waiting_dialog(self, window).wait()

plugins/trustedcoin/trustedcoin.py

@@ -287,13 +287,11 @@ def make_billing_address(wallet, num):
 
 
 class TrustedCoinPlugin(BasePlugin):
+    wallet_class = Wallet_2fa
 
     def __init__(self, parent, config, name):
         BasePlugin.__init__(self, parent, config, name)
-        Wallet_2fa.plugin = self
-
-    def constructor(self, s):
-        return Wallet_2fa(s)
+        self.wallet_class.plugin = self
 
     @staticmethod
     def is_valid_seed(seed):
@@ -348,7 +346,7 @@ class TrustedCoinPlugin(BasePlugin):
         window.wallet.is_billing = False
 
     def on_restore_wallet(self, wallet, wizard):
-        assert isinstance(wallet, Wallet_2fa)
+        assert isinstance(wallet, self.wallet_class)
 
         seed = wizard.request_seed(RESTORE_MSG, is_valid=self.is_valid_seed)
         password = wizard.request_password()