Optimize retrieval of master address

monero/account.py

@@ -49,7 +49,7 @@ class Account(object):
 
         :rtype: :class:`SubAddress <monero.address.SubAddress>`
         """
-        return self._backend.addresses(account=self.index)[0]
+        return self._backend.addresses(account=self.index, addr_indices=[0])[0]
 
     def addresses(self):
         """

monero/backends/jsonrpc.py

@@ -162,8 +162,11 @@ class JSONRPCWallet(object):
         # doesn't return that detail here
         return Account(self, _account['account_index'], label=label), SubAddress(_account['address'])
 
-    def addresses(self, account=0):
-        _addresses = self.raw_request('getaddress', {'account_index': account})
+    def addresses(self, account=0, addr_indices=None):
+        qdata = {'account_index': account}
+        if addr_indices:
+            qdata['address_index'] = addr_indices
+        _addresses = self.raw_request('getaddress', qdata)
         addresses = [None] * (max(map(operator.itemgetter('address_index'), _addresses['addresses'])) + 1)
         for _addr in _addresses['addresses']:
             addresses[_addr['address_index']] = address(
@@ -412,6 +415,8 @@ _err2exc = {
     -5: exceptions.WrongPaymentId,
     -8: exceptions.TransactionNotFound,
     -9: exceptions.SignatureCheckFailed,
+    -14: exceptions.AccountIndexOutOfBound,
+    -15: exceptions.AddressIndexOutOfBound,
     -16: exceptions.TransactionNotPossible,
     -17: exceptions.NotEnoughMoney,
     -20: exceptions.AmountIsZero,

monero/backends/offline.py

@@ -40,8 +40,8 @@ class OfflineWallet(object):
     def new_account(self, label=None):
         raise WalletIsOffline()
 
-    def addresses(self, account=0):
-        if account == 0:
+    def addresses(self, account=0, addr_indices=None):
+        if account == 0 and (addr_indices == [0] or addr_indices is None):
             return [self._address]
         raise WalletIsOffline() # pragma: no cover (this should never happen)
 

monero/exceptions.py

@@ -44,3 +44,9 @@ class WalletIsNotDeterministic(MoneroException):
 
 class GenericTransferError(AccountException):
     pass
+
+class AccountIndexOutOfBound(AccountException):
+    pass
+
+class AddressIndexOutOfBound(AccountException):
+    pass

monero/wallet.py

@@ -176,7 +176,7 @@ class Wallet(object):
 
         :rtype: :class:`Address <monero.address.Address>`
         """
-        return self.accounts[0].addresses()[0]
+        return self.accounts[0].address()
 
     def addresses(self):
         """