watchtower: add watch_channel rpc

electrum/daemon.py

@@ -135,6 +135,7 @@ class WatchTower(DaemonThread):
         port = self.config.get('watchtower_port', 12345)
         server = SimpleJSONRPCServer((host, port), logRequests=True)
         server.register_function(self.lnwatcher.add_sweep_tx, 'add_sweep_tx')
+        server.register_function(self.lnwatcher.watch_channel, 'watch_channel')
         server.timeout = 0.1
         while self.is_running():
             server.handle_request()

electrum/lnwatcher.py

@@ -95,6 +95,7 @@ class LNWatcher(PrintError):
             storage.put('sweepstore', sweepstore)
         storage.write()
 
+    @with_watchtower
     def watch_channel(self, address, outpoint):
         self.watch_address(address)
         with self.lock: