coinchooser methods should not belong in wallet class

gui/kivy/uix/dialogs/settings.py

@@ -8,6 +8,7 @@ from electrum.i18n import languages
 from electrum_gui.kivy.i18n import _
 from electrum.plugins import run_hook
 from electrum.bitcoin import RECOMMENDED_FEE
+from electrum import coinchooser
 
 from choice_dialog import ChoiceDialog
 
@@ -157,13 +158,12 @@ class SettingsDialog(Factory.Popup):
         self._unit_dialog.open()
 
     def coinselect_status(self):
-        return self.app.wallet.coin_chooser_name(self.app.electrum_config)
+        return coinchooser.get_name(self.app.electrum_config)
 
     def coinselect_dialog(self, item, dt):
         if self._coinselect_dialog is None:
-            from electrum import COIN_CHOOSERS
-            choosers = sorted(COIN_CHOOSERS.keys())
-            chooser_name = self.app.wallet.coin_chooser_name(self.config)
+            choosers = sorted(coinchooser.COIN_CHOOSERS.keys())
+            chooser_name = coinchooser.get_name(self.config)
             def cb(text):
                 self.config.set_key('coin_chooser', text)
                 item.status = text

gui/qt/main_window.py

@@ -49,8 +49,8 @@ from electrum.util import (block_explorer, block_explorer_info, format_time,
                            format_satoshis_plain, NotEnoughFunds, StoreDict,
                            UserCancelled)
 from electrum import Transaction, mnemonic
-from electrum import util, bitcoin, commands
-from electrum import SimpleConfig, COIN_CHOOSERS, paymentrequest
+from electrum import util, bitcoin, commands, coinchooser
+from electrum import SimpleConfig, paymentrequest
 from electrum.wallet import Wallet, BIP32_RD_Wallet, Multisig_Wallet
 
 from amountedit import BTCAmountEdit, MyLineEdit, BTCkBEdit
@@ -2845,10 +2845,10 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
             lines = [ln.lstrip(" ") for ln in klass.__doc__.split("\n")]
             return '\n'.join([key, "", " ".join(lines)])
 
-        choosers = sorted(COIN_CHOOSERS.keys())
-        chooser_name = self.wallet.coin_chooser_name(self.config)
+        choosers = sorted(coinchooser.COIN_CHOOSERS.keys())
+        chooser_name = coinchooser.get_name(self.config)
         msg = _('Choose coin (UTXO) selection method.  The following are available:\n\n')
-        msg += '\n\n'.join(fmt_docs(*item) for item in COIN_CHOOSERS.items())
+        msg += '\n\n'.join(fmt_docs(*item) for item in coinchooser.COIN_CHOOSERS.items())
         chooser_label = HelpLabel(_('Coin selection') + ':', msg)
         chooser_combo = QComboBox()
         chooser_combo.addItems(choosers)

lib/coinchooser.py

@@ -308,3 +308,13 @@ class CoinChooserPrivacy(CoinChooserRandom):
 
 COIN_CHOOSERS = {'Priority': CoinChooserOldestFirst,
                  'Privacy': CoinChooserPrivacy}
+
+def get_name(config):
+    kind = config.get('coin_chooser')
+    if not kind in COIN_CHOOSERS:
+        kind = 'Priority'
+    return kind
+
+def get_coin_chooser(config):
+    klass = COIN_CHOOSERS[get_name(config)]
+    return klass()

lib/wallet.py

@@ -47,7 +47,7 @@ from version import *
 from transaction import Transaction
 from plugins import run_hook
 import bitcoin
-from coinchooser import COIN_CHOOSERS
+import coinchooser
 from synchronizer import Synchronizer
 from verifier import SPV
 from mnemonic import Mnemonic
@@ -921,16 +921,6 @@ class Abstract_Wallet(PrintError):
         # this method can be overloaded
         return tx.get_fee()
 
-    def coin_chooser_name(self, config):
-        kind = config.get('coin_chooser')
-        if not kind in COIN_CHOOSERS:
-            kind = 'Priority'
-        return kind
-
-    def coin_chooser(self, config):
-        klass = COIN_CHOOSERS[self.coin_chooser_name(config)]
-        return klass()
-
     def make_unsigned_transaction(self, coins, outputs, config, fixed_fee=None, change_addr=None):
         # check outputs
         for type, data, value in outputs:
@@ -975,7 +965,7 @@ class Abstract_Wallet(PrintError):
 
         # Let the coin chooser select the coins to spend
         max_change = self.max_change_outputs if self.multiple_change else 1
-        coin_chooser = self.coin_chooser(config)
+        coin_chooser = coinchooser.get_coin_chooser(config)
         tx = coin_chooser.make_tx(coins, outputs, change_addrs[:max_change],
                                   fee_estimator, dust_threshold)