From e36b897cd6cf7e52370479127aa85218f6269b51 Mon Sep 17 00:00:00 2001
From: Aleksey Lim <alsroot@sugarlabs.org>
Date: Mon, 11 Nov 2013 01:04:56 +0000
Subject: Close event stream connections on client exists

---
diff --git a/sugar_network/model/routes.py b/sugar_network/model/routes.py
index 6abb758..1701c69 100644
--- a/sugar_network/model/routes.py
+++ b/sugar_network/model/routes.py
@@ -87,7 +87,7 @@ class FrontRoutes(object):
         if response is not None:
             response.content_type = 'text/event-stream'
             response['Cache-Control'] = 'no-cache'
-        return self._pull_events(ping, condition)
+        return self._pull_events(request, ping, condition)
 
     @route('POST', cmd='broadcast',
             mime_type='application/json', acl=ACL.LOCAL)
@@ -120,7 +120,9 @@ class FrontRoutes(object):
             'mime_type': 'image/x-icon',
             })
 
-    def _pull_events(self, ping, condition):
+    def _pull_events(self, request, ping, condition):
+        _logger.debug('Start subscription, total=%s', self._pooler.waiters + 1)
+
         if ping:
             # XXX The whole commands' kwargs handling should be redesigned
             if 'ping' in condition:
@@ -131,8 +133,18 @@ class FrontRoutes(object):
             # `GET /?cmd=subscribe` call.
             yield {'event': 'pong'}
 
+        rfile = None
+        if request is not None:
+            rfile = request.content_stream
+            coroutine.spawn(self._waiter_for_closing, rfile)
+
         while True:
             event = self._pooler.wait()
+            if not isinstance(event, dict):
+                if event is rfile:
+                    break
+                else:
+                    continue
             for key, value in condition.items():
                 if value.startswith('!'):
                     if event.get(key) == value[1:]:
@@ -142,6 +154,14 @@ class FrontRoutes(object):
             else:
                 yield event
 
+        _logger.debug('Stop subscription, total=%s', self._pooler.waiters)
+
+    def _waiter_for_closing(self, rfile):
+        try:
+            coroutine.select([rfile.fileno()], [], [])
+        finally:
+            self._pooler.notify_all(rfile)
+
 
 class _Pooler(object):
     """One-producer-to-many-consumers events delivery."""
@@ -153,6 +173,10 @@ class _Pooler(object):
         self._open = coroutine.Event()
         self._open.set()
 
+    @property
+    def waiters(self):
+        return self._waiters
+
     def wait(self):
         self._open.wait()
         self._waiters += 1
diff --git a/sugar_network/toolkit/router.py b/sugar_network/toolkit/router.py
index 9dd11cd..885bca9 100644
--- a/sugar_network/toolkit/router.py
+++ b/sugar_network/toolkit/router.py
@@ -721,6 +721,9 @@ class _ContentStream(object):
         self._length = length
         self._pos = 0
 
+    def fileno(self):
+        return self._stream.rfile.fileno()
+
     def read(self, size=None):
         if self._length:
             the_rest = max(0, self._length - self._pos)
diff --git a/tests/units/client/routes.py b/tests/units/client/routes.py
index bfd2330..7103584 100755
--- a/tests/units/client/routes.py
+++ b/tests/units/client/routes.py
@@ -193,6 +193,7 @@ class RoutesTest(tests.Test):
         trigger.wait()
         self.node_volume.close()
 
+        coroutine.sleep(1.1)
         volume['context'].update(guid1, {'title': 'title_'})
         volume['context'].delete(guid2)
 
--
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