[2136] Separated the updating process from the receiving process

In the updating process, it communicates with the cfgmgr module for updating
statistics specification of each module. This fix is for separating such mixed
communication process.

src/bin/stats/stats.py.in

@@ -207,6 +207,7 @@ class Stats:
                 sequences = sequences + [ (module_name, seq) \
                                               for i in range(cnt-1) ]
         # start receiving statistics data
+        _statistics_data = []
         while len(sequences) > 0:
             try:
                 (module_name, seq) = sequences.pop(0)
@@ -216,23 +217,28 @@ class Stats:
                     rcode, args = isc.config.ccsession.parse_answer(
                         answer)
                     if rcode == 0:
-                        if self.update_statistics_data(
-                            module_name, env['from'], args):
-                            logger.warn(
-                                STATS_RECEIVED_INVALID_STATISTICS_DATA,
-                                module_name)
-                        else:
-                            if self.update_statistics_data(
-                                self.module_name,
-                                self.cc_session.lname,
-                                {'last_update_time': get_datetime()}):
-                                logger.warn(
-                                    STATS_RECEIVED_INVALID_STATISTICS_DATA,
-                                    self.module_name)
+                        _statistics_data.append(
+                            (module_name, env['from'], args))
             # skip this module if SessionTimeout raised
             except isc.cc.session.SessionTimeout:
                 pass
 
+        # update statistics data
+        while len(_statistics_data) > 0:
+            (_module_name, _lname, _args) = _statistics_data.pop(0)
+            if self.update_statistics_data(_module_name, _lname, _args):
+                logger.warn(
+                STATS_RECEIVED_INVALID_STATISTICS_DATA,
+                _module_name)
+            else:
+                if self.update_statistics_data(
+                    self.module_name,
+                    self.cc_session.lname,
+                    {'last_update_time': get_datetime()}):
+                    logger.warn(
+                        STATS_RECEIVED_INVALID_STATISTICS_DATA,
+                        self.module_name)
+
     def start(self):
         """
         Start stats module