Catch wallet file related exceptions in Qt wizard.

gui/qt/__init__.py

@@ -44,7 +44,8 @@ from electrum import WalletStorage
 # from electrum.synchronizer import Synchronizer
 # from electrum.verifier import SPV
 # from electrum.util import DebugMem
-from electrum.util import UserCancelled, print_error
+from electrum.util import (UserCancelled, print_error,
+                           WalletFileException, BitcoinException)
 # from electrum.wallet import Abstract_Wallet
 
 from .installwizard import InstallWizard, GoBack
@@ -191,7 +192,7 @@ class ElectrumGui:
         except BaseException as e:
             traceback.print_exc(file=sys.stdout)
             d = QMessageBox(QMessageBox.Warning, _('Error'),
-                            _('Cannot load wallet:') + '\n' + str(e))
+                            _('Cannot load wallet') + ' (1):\n' + str(e))
             d.exec_()
             return
         if not wallet:
@@ -203,7 +204,14 @@ class ElectrumGui:
                 pass
             except GoBack as e:
                 print_error('[start_new_window] Exception caught (GoBack)', e)
-            wizard.terminate()
+            except (WalletFileException, BitcoinException) as e:
+                traceback.print_exc(file=sys.stderr)
+                d = QMessageBox(QMessageBox.Warning, _('Error'),
+                                _('Cannot load wallet') + ' (2):\n' + str(e))
+                d.exec_()
+                return
+            finally:
+                wizard.terminate()
             if not wallet:
                 return
 
@@ -220,7 +228,7 @@ class ElectrumGui:
         except BaseException as e:
             traceback.print_exc(file=sys.stdout)
             d = QMessageBox(QMessageBox.Warning, _('Error'),
-                            _('Cannot create window for wallet:') + '\n' + str(e))
+                            _('Cannot create window for wallet') + ':\n' + str(e))
             d.exec_()
             return
         if uri:

lib/bitcoin.py

@@ -32,7 +32,7 @@ import json
 import ecdsa
 import pyaes
 
-from .util import bfh, bh2u, to_string
+from .util import bfh, bh2u, to_string, BitcoinException
 from . import version
 from .util import print_error, InvalidPassword, assert_bytes, to_bytes, inv_dict
 from . import segwit_addr
@@ -349,7 +349,7 @@ def address_to_script(addr):
         script += push_script(bh2u(hash_160))
         script += '87'                                       # op_equal
     else:
-        raise BaseException('unknown address type')
+        raise BitcoinException('unknown address type: {}'.format(addrtype))
     return script
 
 def address_to_scripthash(addr):
@@ -493,7 +493,8 @@ def deserialize_privkey(key):
         vch = DecodeBase58Check(key)
     except BaseException:
         neutered_privkey = str(key)[:3] + '..' + str(key)[-2:]
-        raise BaseException("cannot deserialize", neutered_privkey)
+        raise BitcoinException("cannot deserialize privkey {}"
+                               .format(neutered_privkey))
 
     if txin_type is None:
         # keys exported in version 3.0.x encoded script type in first byte
@@ -888,7 +889,8 @@ def deserialize_xkey(xkey, prv, *, net=None):
         net = constants.net
     xkey = DecodeBase58Check(xkey)
     if len(xkey) != 78:
-        raise BaseException('Invalid length')
+        raise BitcoinException('Invalid length for extended key: {}'
+                               .format(len(xkey)))
     depth = xkey[4]
     fingerprint = xkey[5:9]
     child_number = xkey[9:13]
@@ -896,7 +898,8 @@ def deserialize_xkey(xkey, prv, *, net=None):
     header = int('0x' + bh2u(xkey[0:4]), 16)
     headers = net.XPRV_HEADERS if prv else net.XPUB_HEADERS
     if header not in headers.values():
-        raise BaseException('Invalid xpub format', hex(header))
+        raise BitcoinException('Invalid extended key format: {}'
+                               .format(hex(header)))
     xtype = list(headers.keys())[list(headers.values()).index(header)]
     n = 33 if prv else 32
     K_or_k = xkey[13+n:]

lib/keystore.py

@@ -29,7 +29,8 @@ from unicodedata import normalize
 from . import bitcoin
 from .bitcoin import *
 from . import constants
-from .util import PrintError, InvalidPassword, hfu
+from .util import (PrintError, InvalidPassword, hfu, WalletFileException,
+                   BitcoinException)
 from .mnemonic import Mnemonic, load_wordlist
 from .plugins import run_hook
 
@@ -615,7 +616,8 @@ def xpubkey_to_address(x_pubkey):
         mpk, s = Old_KeyStore.parse_xpubkey(x_pubkey)
         pubkey = Old_KeyStore.get_pubkey_from_mpk(mpk, s[0], s[1])
     else:
-        raise BaseException("Cannot parse pubkey")
+        raise BitcoinException("Cannot parse pubkey. prefix: {}"
+                               .format(x_pubkey[0:2]))
     if pubkey:
         address = public_key_to_p2pkh(bfh(pubkey))
     return pubkey, address
@@ -634,14 +636,15 @@ def hardware_keystore(d):
     if hw_type in hw_keystores:
         constructor = hw_keystores[hw_type]
         return constructor(d)
-    raise BaseException('unknown hardware type', hw_type)
+    raise WalletFileException('unknown hardware type: {}'.format(hw_type))
 
 def load_keystore(storage, name):
-    w = storage.get('wallet_type', 'standard')
     d = storage.get(name, {})
     t = d.get('type')
     if not t:
-        raise BaseException('wallet format requires update')
+        raise WalletFileException(
+            'Wallet format requires update.\n'
+            'Cannot find keystore for name {}'.format(name))
     if t == 'old':
         k = Old_KeyStore(d)
     elif t == 'imported':
@@ -651,7 +654,8 @@ def load_keystore(storage, name):
     elif t == 'hardware':
         k = hardware_keystore(d)
     else:
-        raise BaseException('unknown wallet type', t)
+        raise WalletFileException(
+            'Unknown type {} for keystore named {}'.format(t, name))
     return k
 
 
@@ -709,7 +713,7 @@ def from_seed(seed, passphrase, is_p2sh):
             xtype = 'p2wsh' if is_p2sh else 'p2wpkh'
         keystore.add_xprv_from_seed(bip32_seed, xtype, der)
     else:
-        raise BaseException(t)
+        raise BitcoinException('Unexpected seed type {}'.format(t))
     return keystore
 
 def from_private_key_list(text):
@@ -743,5 +747,5 @@ def from_master_key(text):
     elif is_xpub(text):
         k = from_xpub(text)
     else:
-        raise BaseException('Invalid key')
+        raise BitcoinException('Invalid master key')
     return k

lib/storage.py

@@ -33,7 +33,7 @@ import pbkdf2, hmac, hashlib
 import base64
 import zlib
 
-from .util import PrintError, profiler, InvalidPassword
+from .util import PrintError, profiler, InvalidPassword, WalletFileException
 from .plugins import run_hook, plugin_loaders
 from .keystore import bip44_derivation
 from . import bitcoin
@@ -113,7 +113,7 @@ class WalletStorage(PrintError):
 
         if not self.manual_upgrades:
             if self.requires_split():
-                raise BaseException("This wallet has multiple accounts and must be split")
+                raise WalletFileException("This wallet has multiple accounts and must be split")
             if self.requires_upgrade():
                 self.upgrade()
 
@@ -174,7 +174,7 @@ class WalletStorage(PrintError):
         elif v == STO_EV_XPUB_PW:
             return b'BIE2'
         else:
-            raise Exception('no encryption magic for version: %s' % v)
+            raise WalletFileException('no encryption magic for version: %s' % v)
 
     def decrypt(self, password):
         ec_key = self.get_key(password)
@@ -320,7 +320,7 @@ class WalletStorage(PrintError):
                 storage2.write()
                 result.append(new_path)
         else:
-            raise BaseException("This wallet has multiple accounts and must be split")
+            raise WalletFileException("This wallet has multiple accounts and must be split")
         return result
 
     def requires_upgrade(self):
@@ -419,7 +419,7 @@ class WalletStorage(PrintError):
                     d['seed'] = seed
                 self.put(key, d)
         else:
-            raise Exception('Unable to tell wallet type. Is this even a wallet file?')
+            raise WalletFileException('Unable to tell wallet type. Is this even a wallet file?')
         # remove junk
         self.put('master_public_key', None)
         self.put('master_public_keys', None)
@@ -543,7 +543,7 @@ class WalletStorage(PrintError):
             else:
                 addresses.append(addr)
         if addresses and keypairs:
-            raise BaseException('mixed addresses and privkeys')
+            raise WalletFileException('mixed addresses and privkeys')
         elif addresses:
             self.put('addresses', addresses)
             self.put('accounts', None)
@@ -553,7 +553,7 @@ class WalletStorage(PrintError):
             self.put('keypairs', keypairs)
             self.put('accounts', None)
         else:
-            raise BaseException('no addresses or privkeys')
+            raise WalletFileException('no addresses or privkeys')
 
     def convert_account(self):
         if not self._is_upgrade_method_needed(0, 13):
@@ -566,9 +566,9 @@ class WalletStorage(PrintError):
         if cur_version > max_version:
             return False
         elif cur_version < min_version:
-            raise BaseException(
-                ('storage upgrade: unexpected version %d (should be %d-%d)'
-                 % (cur_version, min_version, max_version)))
+            raise WalletFileException(
+                'storage upgrade: unexpected version {} (should be {}-{})'
+                .format(cur_version, min_version, max_version))
         else:
             return True
 
@@ -584,7 +584,9 @@ class WalletStorage(PrintError):
         if not seed_version:
             seed_version = OLD_SEED_VERSION if len(self.get('master_public_key','')) == 128 else NEW_SEED_VERSION
         if seed_version > FINAL_SEED_VERSION:
-            raise BaseException('This version of Electrum is too old to open this wallet')
+            raise WalletFileException('This version of Electrum is too old to open this wallet.\n'
+                                      '(highest supported storage version: {}, version of this file: {})'
+                                      .format(FINAL_SEED_VERSION, seed_version))
         if seed_version==14 and self.get('seed_type') == 'segwit':
             self.raise_unsupported_version(seed_version)
         if seed_version >=12:
@@ -607,4 +609,4 @@ class WalletStorage(PrintError):
             else:
                 # creation was complete if electrum was run from source
                 msg += "\nPlease open this file with Electrum 1.9.8, and move your coins to a new wallet."
-        raise BaseException(msg)
+        raise WalletFileException(msg)

lib/util.py

@@ -84,6 +84,12 @@ class TimeoutException(Exception):
         return self.message
 
 
+class WalletFileException(Exception): pass
+
+
+class BitcoinException(Exception): pass
+
+
 # Throw this exception to unwind the stack like when an error occurs.
 # However unlike other exceptions the user won't be informed.
 class UserCancelled(Exception):

lib/wallet.py

@@ -44,7 +44,8 @@ import sys
 
 from .i18n import _
 from .util import (NotEnoughFunds, PrintError, UserCancelled, profiler,
-                   format_satoshis, NoDynamicFeeEstimates, TimeoutException)
+                   format_satoshis, NoDynamicFeeEstimates, TimeoutException,
+                   WalletFileException, BitcoinException)
 
 from .bitcoin import *
 from .version import *
@@ -131,6 +132,7 @@ def sweep_preparations(privkeys, network, imax=100):
             find_utxos_for_privkey('p2pk', privkey, compressed)
     if not inputs:
         raise BaseException(_('No inputs found. (Note that inputs need to be confirmed)'))
+        # FIXME actually inputs need not be confirmed now, see https://github.com/kyuupichan/electrumx/issues/365
     return inputs, keypairs
 
 
@@ -335,7 +337,7 @@ class Abstract_Wallet(PrintError):
         addrs = self.get_receiving_addresses()
         if len(addrs) > 0:
             if not bitcoin.is_address(addrs[0]):
-                raise Exception('The addresses in this wallet are not bitcoin addresses.')
+                raise WalletFileException('The addresses in this wallet are not bitcoin addresses.')
 
     def synchronize(self):
         pass
@@ -1166,7 +1168,7 @@ class Abstract_Wallet(PrintError):
             _type, data, value = o
             if _type == TYPE_ADDRESS:
                 if not is_address(data):
-                    raise BaseException("Invalid bitcoin address:" + data)
+                    raise BaseException("Invalid bitcoin address: {}".format(data))
             if value == '!':
                 if i_max is not None:
                     raise BaseException("More than one output set to spend max")
@@ -1339,7 +1341,7 @@ class Abstract_Wallet(PrintError):
 
     def bump_fee(self, tx, delta):
         if tx.is_final():
-            raise BaseException(_("Cannot bump fee: transaction is final"))
+            raise BaseException(_('Cannot bump fee') + ': ' + _('transaction is final'))
         inputs = copy.deepcopy(tx.inputs())
         outputs = copy.deepcopy(tx.outputs())
         for txin in inputs:
@@ -1370,7 +1372,7 @@ class Abstract_Wallet(PrintError):
                 if delta > 0:
                     continue
         if delta > 0:
-            raise BaseException(_('Cannot bump fee: could not find suitable outputs'))
+            raise BaseException(_('Cannot bump fee') + ': ' + _('could not find suitable outputs'))
         locktime = self.get_local_height()
         tx_new = Transaction.from_io(inputs, outputs, locktime=locktime)
         tx_new.BIP_LI01_sort()
@@ -1944,14 +1946,14 @@ class Imported_Wallet(Simple_Wallet):
             txin_type, pubkey = self.keystore.import_privkey(sec, pw)
         except Exception:
             neutered_privkey = str(sec)[:3] + '..' + str(sec)[-2:]
-            raise BaseException('Invalid private key', neutered_privkey)
+            raise BitcoinException('Invalid private key: {}'.format(neutered_privkey))
         if txin_type in ['p2pkh', 'p2wpkh', 'p2wpkh-p2sh']:
             if redeem_script is not None:
-                raise BaseException('Cannot use redeem script with', txin_type)
+                raise BitcoinException('Cannot use redeem script with script type {}'.format(txin_type))
             addr = bitcoin.pubkey_to_address(txin_type, pubkey)
         elif txin_type in ['p2sh', 'p2wsh', 'p2wsh-p2sh']:
             if redeem_script is None:
-                raise BaseException('Redeem script required for', txin_type)
+                raise BitcoinException('Redeem script required for script type {}'.format(txin_type))
             addr = bitcoin.redeem_script_to_address(txin_type, redeem_script)
         else:
             raise NotImplementedError(txin_type)

plugins/trustedcoin/trustedcoin.py

@@ -406,7 +406,7 @@ class TrustedCoinPlugin(BasePlugin):
             xprv1, xpub1 = self.get_xkeys(seed, passphrase, "m/0'/")
             xprv2, xpub2 = self.get_xkeys(seed, passphrase, "m/1'/")
         else:
-            raise BaseException('unrecognized seed length')
+            raise BaseException('unrecognized seed length: {} words'.format(n))
         return xprv1, xpub1, xprv2, xpub2
 
     def create_keystore(self, wizard, seed, passphrase):