From 43df795b1ffc2e99b45ff406670da1e44cb60b0d Mon Sep 17 00:00:00 2001
From: ThomasV <thomasv@electrum.org>
Date: Thu, 26 Nov 2015 10:57:43 +0100
Subject: [PATCH] network: separate callbacks from unanswered_requests

---
 lib/network.py | 51 +++++++++++++++++++++++++-------------------------
 1 file changed, 25 insertions(+), 26 deletions(-)

diff --git a/lib/network.py b/lib/network.py
index 880b21386..b1beacede 100644
--- a/lib/network.py
+++ b/lib/network.py
@@ -166,7 +166,9 @@ class Network(util.DaemonThread):
         self.heights = {}
         self.merkle_roots = {}
         self.utxo_roots = {}
+        # callbacks passed with subscriptions
         self.subscriptions = defaultdict(list)
+        # callbacks set by the GUI
         self.callbacks = defaultdict(list)
 
         dir_path = os.path.join( self.config.path, 'certs')
@@ -454,7 +456,7 @@ class Network(util.DaemonThread):
         self.switch_lagging_interface(i.server)
         self.notify('updated')
 
-    def process_response(self, interface, response, callback):
+    def process_response(self, interface, response):
         if self.debug:
             self.print_error("<--", response)
         error = response.get('error')
@@ -485,17 +487,9 @@ class Network(util.DaemonThread):
         elif method == 'blockchain.block.get_header':
             self.on_get_header(interface, response)
         else:
-            if callback is None:
-                params = response['params']
-                with self.lock:
-                    for k,v in self.subscriptions.items():
-                        if (method, params) in v:
-                            callback = k
-                            break
-            if callback is None:
-                self.print_error("received unexpected notification",
-                                 method, params)
-            else:
+            params = response['params']
+            callbacks = self.subscriptions.get(repr((method, params)), [])
+            for callback in callbacks:
                 callback(response)
 
     def process_responses(self, interface):
@@ -511,7 +505,7 @@ class Network(util.DaemonThread):
                 client_req = self.unanswered_requests.pop(message_id, None)
                 if client_req:
                     assert interface == self.interface
-                    callback = client_req[2]
+
                 # Copy the request method and params to the response
                 response['method'] = method
                 response['params'] = params
@@ -534,12 +528,21 @@ class Network(util.DaemonThread):
                     response['result'] = params[1]
 
             # Response is now in canonical form
-            self.process_response(interface, response, callback)
+            self.process_response(interface, response)
 
     def send(self, messages, callback):
         '''Messages is a list of (method, params) tuples'''
         with self.lock:
-            self.pending_sends.append((messages, callback))
+            subs = filter(lambda (m,v): m.endswith('.subscribe'), messages)
+            for method, params in subs:
+                k = repr((method, params))
+                l = self.subscriptions.get(k, [])
+                if callback not in l:
+                    l.append(callback)
+                self.subscriptions[k] = l
+
+            self.pending_sends += messages
+
 
     def process_pending_sends(self):
         # Requests needs connectivity.  If we don't have an interface,
@@ -551,23 +554,19 @@ class Network(util.DaemonThread):
             sends = self.pending_sends
             self.pending_sends = []
 
-        for messages, callback in sends:
-            subs = filter(lambda (m,v): m.endswith('.subscribe'), messages)
-            with self.lock:
-                for sub in subs:
-                    if sub not in self.subscriptions[callback]:
-                        self.subscriptions[callback].append(sub)
-
-            for method, params in messages:
-                message_id = self.queue_request(method, params)
-                self.unanswered_requests[message_id] = method, params, callback
+        for method, params in sends:
+            message_id = self.queue_request(method, params)
+            self.unanswered_requests[message_id] = method, params
 
     def unsubscribe(self, callback):
         '''Unsubscribe a callback to free object references to enable GC.'''
         # Note: we can't unsubscribe from the server, so if we receive
         # subsequent notifications process_response() will emit a harmless
         # "received unexpected notification" warning
-        self.subscriptions.pop(callback, None)
+        with self.lock:
+            for v in self.subscriptions.values():
+                if callback in v:
+                    v.remove(callback)
 
     def connection_down(self, server):
         '''A connection to server either went down, or was never made.