add meter object

meters.py

@@ -6,23 +6,20 @@ import copy
 
 con = mqtt.Client()
 con.connect('10.8.1.16')
-
-lock = threading.Lock()
-measurements = {}
-
 con.subscribe('iot/+/+/energy')
 
-class Measurements:
+class Meters:
     class Meter:
-        def __init__(self, _id):
+        def __init__(self, _id, history_size = 10):
             self.id = _id
             self.energy = []
+            self.history_size = 10
 
-        def add_energy_measurement(energy):
+        def add_energy_measurement(self, energy):
             self.energy.append((datetime.datetime.now(), energy))
-            self.energy = self.energy[-10:]
+            self.energy = self.energy[-self.history_size:]
 
-        def get_metrics():
+        def get_metrics(self):
             if len(self.energy) > 0:
                 last = self.energy[-1]
                 s = ('energy{{node="esp8266-{mid:s}"}}  {energy:f} '
@@ -32,18 +29,27 @@ class Measurements:
             else:
                 return ''
     def __init__(self):
-        self._meters = []
+        self._meters = {}
         self._lock = threading.Lock()
 
     def _get_meter_by_id(self, _id):
         if _id not in self._meters:
-            self._meters[_id] = Meter(_id)
+            self._meters[_id] = self.Meter(_id)
         return self._meters[_id]
 
-    def add_energy_measurement(meter_id, energy):
+    def add_energy_measurement(self, meter_id, energy):
         with self._lock:
             meter = self._get_meter_by_id(meter_id)
-            meter.energy.append((datetime.datetime.now(), energy))
+            meter.add_energy_measurement(energy)
+
+    def get_metrics(self):
+        with self._lock:
+            s = ''
+            for meter in self._meters.values():
+                s += meter.get_metrics()
+        return s
+
+meters = Meters()
 
 def on_message(client, userdata, message):
     m = re.match('iot/(?P<id>[^/]+)/[^/]+/energy', message.topic)
@@ -55,12 +61,7 @@ def on_message(client, userdata, message):
         else: 
             if message.retain == 0:
                 mid = m.group('id')
-                with lock:
-                    if mid not in measurements:
-                        measurements[mid] = []
-                    ms = measurements[mid]
-                    ms.append((datetime.datetime.now(), energy))
-                    measurements[mid] = ms[-10:]
+                meters.add_energy_measurement(mid, energy)
     
 con.on_message = on_message
 con.loop_start()
@@ -73,14 +74,7 @@ def metrics():
     r = ""
     r += "# HELP energy energy in joules\n"
     r += "# TYPE energy counter\n"
-    with lock:
-        m = copy.deepcopy(measurements)
-    for mid in m:
-        ms = [m[mid][-1]]
-        for s in ms:
-            r += 'energy{{node="esp8266-{mid:s}"}} {energy:f} {epoch:d}\n'.format(mid=mid, energy=s[1], epoch=int(s[0].timestamp() * 1000) )
+    r += meters.get_metrics()
     return flask.Response(r, mimetype='text/plain; version=0.0.4')
 
 app.run('0.0.0.0')
-
-