sql_db: do not require network object

electrum/channel_db.py

@@ -242,7 +242,7 @@ class ChannelDB(SqlDB):
 
     def __init__(self, network: 'Network'):
         path = os.path.join(get_headers_dir(network.config), 'gossip_db')
-        super().__init__(network, path, commit_interval=100)
+        super().__init__(network.asyncio_loop, path, commit_interval=100)
         self.lock = threading.RLock()
         self.num_nodes = 0
         self.num_channels = 0

electrum/sql_db.py

@@ -19,9 +19,9 @@ def sql(func):
 
 class SqlDB(Logger):
     
-    def __init__(self, network, path, commit_interval=None):
+    def __init__(self, asyncio_loop, path, commit_interval=None):
         Logger.__init__(self)
-        self.network = network
+        self.asyncio_loop = asyncio_loop
         self.path = path
         self.commit_interval = commit_interval
         self.db_requests = queue.Queue()
@@ -34,7 +34,7 @@ class SqlDB(Logger):
         self.logger.info("Creating database")
         self.create_database()
         i = 0
-        while self.network.asyncio_loop.is_running():
+        while self.asyncio_loop.is_running():
             try:
                 future, func, args, kwargs = self.db_requests.get(timeout=0.1)
             except queue.Empty: