From 7f1bdbda6000e96901ad01badbb58c6cbdf8a73c Mon Sep 17 00:00:00 2001
From: Aleksey Lim <alsroot@sugarlabs.org>
Date: Thu, 27 Sep 2012 16:49:01 +0000
Subject: Reconnect after closing subscription socket, it might be triggered by server timeouts

---
diff --git a/sugar_network/local/mounts.py b/sugar_network/local/mounts.py
index 3203c3b..a08e693 100644
--- a/sugar_network/local/mounts.py
+++ b/sugar_network/local/mounts.py
@@ -358,6 +358,8 @@ class RemoteMount(ad.CommandsProcessor, _Mount, _ProxyCommands):
             finally:
                 _logger.info('Got disconnected from %r master', url)
                 _Mount.set_mounted(self, False)
+                self._client.close()
+                self._client = None
 
 
 class NodeMount(LocalMount, _ProxyCommands):
diff --git a/sugar_network/local/mountset.py b/sugar_network/local/mountset.py
index 04c5723..ef74648 100644
--- a/sugar_network/local/mountset.py
+++ b/sugar_network/local/mountset.py
@@ -140,6 +140,8 @@ class Mountset(dict, ad.CommandsProcessor, Commands, SyncCommands):
             del self._subscriptions[callback]
 
     def publish(self, event):
+        _logger.debug('Publish event: %r', event)
+
         for callback, condition in self._subscriptions.items():
             for key, value in condition.items():
                 if event.get(key) != value:
diff --git a/sugar_network/toolkit/http.py b/sugar_network/toolkit/http.py
index 368cd08..69a7acb 100644
--- a/sugar_network/toolkit/http.py
+++ b/sugar_network/toolkit/http.py
@@ -18,6 +18,7 @@
 import os
 import cgi
 import json
+import time
 import shutil
 import logging
 import hashlib
@@ -33,15 +34,20 @@ from sugar_network.zerosugar import Bundle
 from active_toolkit.sockets import decode_multipart, BUFFER_SIZE
 from sugar_network.toolkit import sugar
 from sugar_network import local
-from active_toolkit import enforce
+from active_toolkit import coroutine, enforce
 
 # Let toolkit.http work in concurrence
 from gevent import monkey
 # XXX No DNS because `toolkit.network.res_init()` doesn't work otherwise
 monkey.patch_socket(dns=False)
+monkey.patch_select()
 monkey.patch_ssl()
+monkey.patch_time()
 
 
+_RECONNECTION_NUMBER = 1
+_RECONNECTION_TIMEOUT = 3
+
 _logger = logging.getLogger('http')
 
 
@@ -67,6 +73,15 @@ class Client(object):
 
         self._session = Session(headers=headers, verify=verify, prefetch=False)
 
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *args):
+        self.close()
+
+    def close(self):
+        self._session.close()
+
     def get(self, path_=None, **kwargs):
         kwargs.update(self.params)
         response = self.request('GET', path_, params=kwargs)
@@ -215,11 +230,34 @@ class Client(object):
         return mime_type
 
     def subscribe(self):
-        response = self._decode_response(
-                self.request('GET', params={'cmd': 'subscribe'}))
-        for line in _readlines(response.raw):
-            if line.startswith('data: '):
-                yield json.loads(line.split(' ', 1)[1])
+
+        def handshake():
+            _logger.debug('Subscribe to %r', self.api_url)
+            return self.request('GET', params={'cmd': 'subscribe'}).raw
+
+        def pull_events(stream):
+            retries = _RECONNECTION_NUMBER
+            while True:
+                start_time = time.time()
+                try:
+                    if stream is None:
+                        stream = handshake()
+                    for line in _readlines(stream):
+                        if line.startswith('data: '):
+                            yield json.loads(line.split(' ', 1)[1])
+                except Exception:
+                    if time.time() - start_time > _RECONNECTION_TIMEOUT * 10:
+                        retries = _RECONNECTION_NUMBER
+                    if retries <= 0:
+                        raise
+                _logger.debug('Re-subscribe to %r in %s second(s)',
+                        self.api_url, _RECONNECTION_TIMEOUT)
+                self.close()
+                coroutine.sleep(_RECONNECTION_TIMEOUT)
+                retries -= 1
+                stream = None
+
+        return pull_events(handshake())
 
     def _register(self):
         self.request('POST', ['user'],
diff --git a/tests/__init__.py b/tests/__init__.py
index 2ec7f1d..9d7359a 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -89,6 +89,7 @@ class Test(unittest.TestCase):
         stats.stats_rras.value = ['RRA:AVERAGE:0.5:1:100']
         stats._cache.clear()
         obs._client = None
+        http._RECONNECTION_NUMBER = 0
 
         Volume.RESOURCES = [
                 'sugar_network.resources.user',
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