get_history: return empty history if balance check fails

lib/wallet.py

@@ -737,8 +737,7 @@ class Abstract_Wallet(object):
                 delta = self.get_tx_delta(tx_hash, addr)
                 hh.append([addr, tx_hash, height, delta])
 
-        # 2. merge 
+        # 2. merge: the delta of a tx on the domain is the sum of its deltas on addresses
-        # the delta of a tx on the domain is the sum of its deltas on addresses
         merged = {}
         for addr, tx_hash, height, delta in hh:
             if tx_hash not in merged:
@@ -749,15 +748,13 @@ class Abstract_Wallet(object):
 
         # 3. create sorted list
         history = []
-        #balance = 0
         for tx_hash, v in merged.items():
             height, value = v
-            #balance += value
             conf, timestamp = self.verifier.get_confirmations(tx_hash) if self.verifier else (None, None)
             history.append((tx_hash, conf, value, timestamp))
-        if self.verifier:
         history.sort(key = lambda x: self.verifier.get_txpos(x[0]))
 
+        # 4. add balance
         c, u = self.get_balance(domain)
         balance = c + u
         h2 = []
@@ -769,11 +766,10 @@ class Abstract_Wallet(object):
             else:
                 balance = None
 
-        assert balance in [None, 0]
+        # fixme: this may happen if history is incomplete
-        #if balance not in [None, 0]:
+        if balance not in [None, 0]:
-        #    print_error("history error")
+            print_error("Error: history not synchronized")
-        #    self.clear_history()
+            return []
-        #    self.update()
 
         return h2