81 lines
2.2 KiB
Python
81 lines
2.2 KiB
Python
import paho.mqtt.client as mqtt
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import threading
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import re
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import datetime
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import copy
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con = mqtt.Client()
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con.connect('10.8.1.16')
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con.subscribe('iot/+/+/energy')
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class Meters:
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class Meter:
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def __init__(self, _id, history_size = 10):
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self.id = _id
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self.energy = []
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self.history_size = 10
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def add_energy_measurement(self, energy):
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self.energy.append((datetime.datetime.now(), energy))
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self.energy = self.energy[-self.history_size:]
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def get_metrics(self):
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if len(self.energy) > 0:
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last = self.energy[-1]
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s = ('energy{{node="esp8266-{mid:s}"}} {energy:f} '
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'{epoch:d}\n').format(mid=self.id, energy=last[1],
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epoch=int(last[0].timestamp() * 1000))
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return s
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else:
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return ''
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def __init__(self):
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self._meters = {}
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self._lock = threading.Lock()
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def _get_meter_by_id(self, _id):
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if _id not in self._meters:
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self._meters[_id] = self.Meter(_id)
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return self._meters[_id]
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def add_energy_measurement(self, meter_id, energy):
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with self._lock:
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meter = self._get_meter_by_id(meter_id)
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meter.add_energy_measurement(energy)
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def get_metrics(self):
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with self._lock:
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s = ''
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for meter in self._meters.values():
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s += meter.get_metrics()
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return s
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meters = Meters()
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def on_message(client, userdata, message):
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m = re.match('iot/(?P<id>[^/]+)/[^/]+/energy', message.topic)
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if m is not None:
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try:
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energy = int(re.match('^(?P<joules>[0-9]*) J', message.payload.decode('ASCII')).group('joules'))
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except AttributeError:
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pass
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else:
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if message.retain == 0:
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mid = m.group('id')
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meters.add_energy_measurement(mid, energy)
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con.on_message = on_message
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con.loop_start()
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import flask
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app = flask.Flask(__name__)
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@app.route('/metrics')
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def metrics():
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r = ""
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r += "# HELP energy energy in joules\n"
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r += "# TYPE energy counter\n"
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r += meters.get_metrics()
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return flask.Response(r, mimetype='text/plain; version=0.0.4')
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app.run('0.0.0.0')
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