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Telegraf の入力データフォーマットを JSON にする

Last updated at Posted at 2021-08-29

こちらのプログラムの Telegraf の入力フォーマットを JSON に変更しました。プロトコルは udp のままです。
Telegraf で InfluxDB 2.0 にデータを入れる

Telegraf の設定ファイル

/etc/telegraf/telegraf.conf
(省略)
[[outputs.influxdb_v2]]
urls = ["http://127.0.0.1:8086"]
token = "1zIYs1taCm3pWQOBUNk0ssYccOF7YgJcdGyJDbiFYTBf7hcPvyl5nGyt71rNVkYtg2rB
ceUwQ1r5Xzm7Mabcde=="
organization = "ekzemplaro"
bucket = "tochigi"
(省略)
[[inputs.socket_listener]]
service_address = "udp://:8092"
json_name_key = "name"
data_format = "json"
(省略)

テストスクリプト

#
echo '{"name":"aaa","temperature":23.5,"humidity":42.3}' | ncat -4 -u -w 1 localhost 8092
sleep 10
echo '{"name":"aaa","temperature":24.6,"humidity":53.5}' | ncat -4 -u -w 1 localhost 8092
sleep 10
echo '{"name":"aaa","temperature":25.9,"humidity":64.3}' | ncat -4 -u -w 1 localhost 8092
sleep 10
echo '{"name":"aaa","temperature":26.7,"humidity":76.3}' | ncat -4 -u -w 1 localhost 8092
sleep 10
echo '{"name":"aaa","temperature":25.5,"humidity":55.3}' | ncat -4 -u -w 1 localhost 8092
sleep 10
echo '{"name":"aaa","temperature":25.1,"humidity":48.3}' | ncat -4 -u -w 1 localhost 8092
sleep 10
echo '{"name":"aaa","temperature":24.1,"humidity":43.7}' | ncat -4 -u -w 1 localhost 8092

Python3 のテストスクリプト

udp_send.py
#! /usr/bin/python
#
#	udp_send.py
#
#						Aug/29/2021
# ------------------------------------------------------------------
import	sys
import	json
import	time
from socket import socket, AF_INET, SOCK_DGRAM

HOST = ''
PORT = 8092
ADDRESS = "localhost"

# ------------------------------------------------------------------
def udp_send_proc(temp,humi):
	unit_aa = {}
	unit_aa["name"] = "aaa"
	unit_aa["temperature"] = temp
	unit_aa["humidity"] = humi
	msg = json.dumps(unit_aa)
#
	ss = socket(AF_INET, SOCK_DGRAM)
	ss.sendto(msg.encode(), (ADDRESS, PORT))
	ss.close()
#
# ------------------------------------------------------------------
sys.stderr.write("*** 開始 ***\n")
#
udp_send_proc(25.4,55.2)
time.sleep(10)
udp_send_proc(26.4,56.2)
time.sleep(10)
udp_send_proc(26.2,56.9)
#
sys.stderr.write("*** 終了 ***\n")
# ------------------------------------------------------------------

Node.js のサンプルです。

udpclient.js
#! /usr/bin/node
// ---------------------------------------------------------------
//
//	udpclient.js
//
//					Aug/29/2021	
// ---------------------------------------------------------------
// UDP Sample Client

// UDP 接続先
const host = "localhost"
const c_port = 8092
var dgram = require("dgram")
var client = dgram.createSocket("udp4")

// ---------------------------------------------------------------
// サーバからメッセージ受信したときの処理
client.on("message", function(msg, rinfo) {
	console.log("recieved: " + msg.toString("hex"))
	client.close()
})

// ---------------------------------------------------------------
// メッセージ送信でエラーが起きた時の処理
client.on("err", function(err) {
	console.log("client error: \n" + err.stack);
	console.close()
})

// ---------------------------------------------------------------
// Socket をクローズした時の処理
client.on("close", function() {
	console.log("closed.")
})

// ---------------------------------------------------------------
// メッセージ送信

function send(message, host, port) {
	client.send(message, 0, message.length, port, host, function(err, bytes) {
	console.log("*** sent ***")
	client.close()
	console.error ("*** 終了 ***")
	})
}

// ---------------------------------------------------------------
console.error ("*** 開始 ***")

var unit_aa = new Object ()
unit_aa["name"] = "aaa"
unit_aa["temperature"] = 27.0
unit_aa["humidity"] = 56.3
const json_str = JSON.stringify(unit_aa)
const message = new Buffer.from(json_str)

send(message, host, c_port)

// ---------------------------------------------------------------

こちらのプログラムを参考にしました。
PythonによるUDP通信

Node.js で繰り返し送信するサンプルはこちら
Node.js: 一定時間毎に udp 送信を行う

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