restructure synchronizer

fix CLI notify cmd. fix merchant websockets.

electrum/interface.py

@@ -28,7 +28,7 @@ import ssl
 import sys
 import traceback
 import asyncio
-from typing import Tuple, Union
+from typing import Tuple, Union, List
 from collections import defaultdict
 
 import aiorpcx
@@ -57,7 +57,7 @@ class NotificationSession(ClientSession):
         # will catch the exception, count errors, and at some point disconnect
         if isinstance(request, Notification):
             params, result = request.args[:-1], request.args[-1]
-            key = self.get_index(request.method, params)
+            key = self.get_hashable_key_for_rpc_call(request.method, params)
             if key in self.subscriptions:
                 self.cache[key] = result
                 for queue in self.subscriptions[key]:
@@ -78,10 +78,10 @@ class NotificationSession(ClientSession):
             except asyncio.TimeoutError as e:
                 raise RequestTimedOut('request timed out: {}'.format(args)) from e
 
-    async def subscribe(self, method, params, queue):
+    async def subscribe(self, method: str, params: List, queue: asyncio.Queue):
         # note: until the cache is written for the first time,
         # each 'subscribe' call might make a request on the network.
-        key = self.get_index(method, params)
+        key = self.get_hashable_key_for_rpc_call(method, params)
         self.subscriptions[key].append(queue)
         if key in self.cache:
             result = self.cache[key]
@@ -99,7 +99,7 @@ class NotificationSession(ClientSession):
                 v.remove(queue)
 
     @classmethod
-    def get_index(cls, method, params):
+    def get_hashable_key_for_rpc_call(cls, method, params):
         """Hashable index for subscriptions and cache"""
         return str(method) + repr(params)
 
@@ -141,7 +141,7 @@ class Interface(PrintError):
         self._requested_chunks = set()
         self.network = network
         self._set_proxy(proxy)
-        self.session = None
+        self.session = None  # type: NotificationSession
 
         self.tip_header = None
         self.tip = 0