monitor: Logrotate can call this script multiple times

  Consider the last start date to not include same entry multiple times

slapos/monitor/build_statistic.py

@@ -15,15 +15,34 @@ def parseArguments():
 
   return parser
 
+
 def buildStatistic(history_folder):
+  now = time.time()
   for p in glob.glob("%s/*.history.json" % history_folder):
     result = {}
     stats_list = []
     promise_name = p.split("/")[-1].replace(".history.json", "")
 
+    stat_file_path = p.replace(".history.json", ".stats.json")
+    if os.path.exists(stat_file_path):
+      with open(stat_file_path) as f:
+        stats_dict = json.load(f)
+        f.close()
+    else:
+      stats_dict = {"date": now, "data": []}
+
+    last_date = None
+    if stats_dict["data"]:
+      last_date = stats_dict["data"][-1]["start-date"]
+
     with open(p) as f:
       j = json.load(f)
 
+      j_last_date = j['data'][-1]["start-date"]
+      if last_date == j_last_date:
+        # This file was already loaded, so skip
+        continue
+
       for entry in j['data']:
         day = entry["start-date"].split(" ")[0]
         result.setdefault(day, {"ERROR": 0, "OK": 0})
@@ -33,17 +52,10 @@ def buildStatistic(history_folder):
     for date, stat in result.iteritems():
       stats_list.append(
         {"status": "ERROR" if stat["ERROR"] > 0 else "OK",
-         "change-time": 0,
-         "start-date": "%s 00:00:00" % date,
+         "change-time": now,
+         "start-date": j_last_date,
          "message": stat})
 
-    stat_file_path = p.replace(".history.json", ".stats.json")
-    if os.path.exists(stat_file_path):
-      with open(stat_file_path) as f:
-        stats_dict = json.load(f)
-        f.close()
-    else:
-      stats_dict = {"date": time.time(), "data": []}
 
     stats_dict["data"].extend(stats_list)