From 40389a21b6c87046175f792b93782e5cccbddb19 Mon Sep 17 00:00:00 2001
From: JeremyRand <jeremyrand@airmail.cc>
Date: Wed, 8 Apr 2020 03:09:08 +0000
Subject: [PATCH] Use specific Exception when chain isn't synced

Makes it easier for calling code to know what error happened.
---
 electrum/commands.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/electrum/commands.py b/electrum/commands.py
index 2cf1ab00d..02fb82b38 100644
--- a/electrum/commands.py
+++ b/electrum/commands.py
@@ -68,6 +68,10 @@ if TYPE_CHECKING:
 known_commands = {}  # type: Dict[str, Command]
 
 
+class NotSynchronizedException(Exception):
+    pass
+
+
 def satoshis(amount):
     # satoshi conversion must not be performed by the parser
     return int(COIN*Decimal(amount)) if amount not in ['!', None] else amount
@@ -815,7 +819,7 @@ class Commands:
         if not isinstance(wallet, Deterministic_Wallet):
             raise Exception("This wallet is not deterministic.")
         if not wallet.is_up_to_date():
-            raise Exception("Wallet not fully synchronized.")
+            raise NotSynchronizedException("Wallet not fully synchronized.")
         return wallet.min_acceptable_gap()
 
     @command('w')