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httpでpostしたデータをmqttでpublishする

Posted at

はじめに

zabbixのwebhookから通知されたアラートをmqttでばらまきたくて、httpでpostされたjsonデータをmqttでpublishする簡単なプログラムを書いてみました。

websocketではなくmqttにした理由

mqttをつかったことがなく、使ってみたかったから

実装

pythonで実装します。flaskとpaho-mqttが必要なのでインストールします。

$ pip install flask paho-mqtt

topic, payload, client_idがjsonでPOSTされてきたときmqttでpublishするようコーディングします。

http_publisher.py
from flask import Flask, request
import paho.mqtt.publish as publish

app = Flask(__name__)

BROKER = 'localhost'
PORT = 1883


@app.route('/', methods=["POST"])
def send():
    data = request.json
    if data and 'topic' in data and 'payload' in data and 'client_id' in data:
        try:
            publish.single(
                data["topic"],
                data["payload"],
                hostname=BROKER,
                port=PORT,
                client_id=data['client_id'],
            )
        except Exception as e:
            print(e)
            raise e
        return data
    else:
        return "Bad Request", 400


if __name__ == '__main__':
    app.run()

動作確認

ここで作ったコンテナとsubscriber.pyを使って動作確認してみます。

コンテナ起動

$ docker run -it -d -p 1883:1883 -p 9001:9001 -v $PWD/mosquitto.conf:/mosquitto/config/mosquitto.conf eclipse-mosquitto

subscriber起動

$ python subscriber.py
Connected to MQTT Broker!

http_publisher起動

$ python http_publisher.py
 * Serving Flask app 'http_publisher' (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployme                                                                                                                                   nt.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

データをPOST

$ curl -X POST -H 'Content-Type:application/json' -d '{"topic":"pyjackal/mqtt", "payload":"hello world!!", "client_id": "publisher1"}' http://127.0.0.1:5000/
{"client_id":"publisher1","payload":"hello world!!","topic":"pyjackal/mqtt"}
$

無事受け取れました

$ python subscriber.py
Connected to MQTT Broker!
Received `hello world!!` from `pyjackal/mqtt` topic

実運用するには認証とかリクエストが集中した時の挙動とか考慮しなければならないことがいろいろありますが、やりたいことはできそうです。

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