Sebelum memulai
Anda seharusnya sudah menginstal Node-Red dengan node momen. Berbagai metode instalasi dijelaskan di situs pengembang /nodered.org/docs/getting-started /
Impor kode aliran ke dalam Node-RED Anda dan Anda akan memiliki semua node seperti pada gambar
[{"id":"ff8e6c15.1db9e","type":"inject","z":"c20c2bf8.f5bba8","name":"1 min","topic":"","payload":"","payloadType":"date","repeat":"60","crontab":"","once":false,"onceDelay":0.1,"x":230,"y":240,"wires":[["aa173003.800e9"]]},{"id":"fa2dd78f.64ef58","type":"http request","z":"c20c2bf8.f5bba8","name":"name.com","method":"GET","ret":"txt","url":"https://name.com","tls":"","x":210,"y":500,"wires":[["3c3eb473.fddb4c","6c05ab54.c151a4"]]},{"id":"3c3eb473.fddb4c","type":"switch","z":"c20c2bf8.f5bba8","name":"not 200 respons","property":"statusCode","propertyType":"msg","rules":[{"t":"neq","v":"200","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":440,"y":520,"wires":[["5a06f9e1.e303d8","cc3ecdf3.6ce24"]]},{"id":"6c05ab54.c151a4","type":"switch","z":"c20c2bf8.f5bba8","name":"found word on web","property":"payload","propertyType":"msg","rules":[{"t":"cont","v":"ca-pub-1234545647","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":450,"y":480,"wires":[["834b9f2b.cfb89","cc3ecdf3.6ce24"]]},{"id":"107dec81.7d3953","type":"function","z":"c20c2bf8.f5bba8","name":"web up","func":"\nreturn {\n payload: ` ${msg.responseUrl} its OK`\n}","outputs":1,"noerr":0,"x":1140,"y":420,"wires":[["e3f88e59.88023"]]},{"id":"d5bf4f53.b8ae2","type":"function","z":"c20c2bf8.f5bba8","name":"web down","func":"\nreturn {\n payload: ` name.com it is DOWN at`\n}","outputs":1,"noerr":0,"x":1140,"y":620,"wires":[["300022a2.3d497e"]]},{"id":"ddeb8430.749ed8","type":"inject","z":"c20c2bf8.f5bba8","name":"","topic":"","payload":"","payloadType":"date","repeat":"1","crontab":"","once":false,"onceDelay":0.1,"x":250,"y":100,"wires":[["e82f93c1.0e89e"]]},{"id":"e82f93c1.0e89e","type":"moment","z":"c20c2bf8.f5bba8","name":"","topic":"","input":"","inputType":"msg","inTz":"Europe/Moscow","adjAmount":"0","adjType":"hours","adjDir":"add","format":"date","locale":"en_US","output":"time","outputType":"flow","outTz":"Europe/Moscow","x":460,"y":100,"wires":[[]]},{"id":"4c032cf4.424084","type":"file","z":"c20c2bf8.f5bba8","name":"Write www.log","filename":"/root/iot_data/www.log","appendNewline":true,"createDir":false,"overwriteFile":"false","x":1820,"y":480,"wires":[[]]},{"id":"834e384f.425cb8","type":"function","z":"c20c2bf8.f5bba8","name":"Add time to data","func":"var timenow=flow.get('time');\nvar downtimenow=flow.get('downmin')-5;\nmsg.payload = msg.payload + ' ' + timenow + '. Downtime: ' + downtimenow + 'min #myhost' ;\nreturn msg;","outputs":1,"noerr":0,"x":1640,"y":500,"wires":[["4c032cf4.424084","4c25ef47.71b94"]]},{"id":"e3f88e59.88023","type":"trigger","z":"c20c2bf8.f5bba8","op1":"","op2":"","op1type":"pay","op2type":"pay","duration":"0","extend":true,"units":"min","reset":"reset","bytopic":"all","name":"","x":1360,"y":420,"wires":[["e24a68a2.c83f58"]]},{"id":"300022a2.3d497e","type":"trigger","z":"c20c2bf8.f5bba8","op1":"","op2":"","op1type":"pay","op2type":"pay","duration":"0","extend":true,"units":"min","reset":"reset","bytopic":"all","name":"","x":1360,"y":620,"wires":[["419d4a24.ec1604","11c46064.1ffc7"]]},{"id":"aac1daf2.c77e18","type":"function","z":"c20c2bf8.f5bba8","name":"send reset","func":"\nreturn {\n payload: `reset`\n}","outputs":1,"noerr":0,"x":1150,"y":540,"wires":[["e3f88e59.88023"]]},{"id":"59f336.30325ccc","type":"function","z":"c20c2bf8.f5bba8","name":"send reset","func":"\nreturn {\n payload: `reset`\n}","outputs":1,"noerr":0,"x":1150,"y":480,"wires":[["300022a2.3d497e"]]},{"id":"5a06f9e1.e303d8","type":"counter","z":"c20c2bf8.f5bba8","name":"count to 10","init":"0","step":"1","lower":"0","upper":"10","mode":"increment","outputs":1,"x":690,"y":660,"wires":[["e93a8fe8.8bb23"]]},{"id":"323380d1.a71af","type":"switch","z":"c20c2bf8.f5bba8","name":"if its 3","property":"count","propertyType":"msg","rules":[{"t":"eq","v":"3","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":990,"y":660,"wires":[["d5bf4f53.b8ae2","aac1daf2.c77e18"]]},{"id":"24d1969a.a4e5da","type":"function","z":"c20c2bf8.f5bba8","name":"reset counter","func":"msg.reset = true; return msg","outputs":1,"noerr":0,"x":890,"y":440,"wires":[["5a06f9e1.e303d8"]]},{"id":"834b9f2b.cfb89","type":"counter","z":"c20c2bf8.f5bba8","name":"count to 10","init":"0","step":"1","lower":"0","upper":"10","mode":"increment","outputs":1,"x":670,"y":380,"wires":[["641f8b3.143cd74"]]},{"id":"440de7c7.eb6d48","type":"function","z":"c20c2bf8.f5bba8","name":"reset counter","func":"msg.reset = true; return msg","outputs":1,"noerr":0,"x":850,"y":580,"wires":[["834b9f2b.cfb89"]]},{"id":"1b410fb8.f2e8b","type":"switch","z":"c20c2bf8.f5bba8","name":"if its 5","property":"count","propertyType":"msg","rules":[{"t":"eq","v":"5","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":990,"y":380,"wires":[["107dec81.7d3953","59f336.30325ccc"]]},{"id":"641f8b3.143cd74","type":"switch","z":"c20c2bf8.f5bba8","name":"it its > 0","property":"count","propertyType":"msg","rules":[{"t":"gt","v":"0","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":840,"y":380,"wires":[["24d1969a.a4e5da","1b410fb8.f2e8b"]]},{"id":"e93a8fe8.8bb23","type":"switch","z":"c20c2bf8.f5bba8","name":"it its > 0","property":"count","propertyType":"msg","rules":[{"t":"gt","v":"0","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":840,"y":660,"wires":[["323380d1.a71af","440de7c7.eb6d48"]]},{"id":"e24a68a2.c83f58","type":"switch","z":"c20c2bf8.f5bba8","name":"not a on start web up message","property":"payload","propertyType":"msg","rules":[{"t":"neq","v":"Started!","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":1650,"y":420,"wires":[["834e384f.425cb8"]]},{"id":"2ef6b867.dd9328","type":"inject","z":"c20c2bf8.f5bba8","name":"","topic":"","payload":"Started!","payloadType":"str","repeat":"","crontab":"","once":true,"onceDelay":"","x":240,"y":160,"wires":[["e3f88e59.88023","24d1969a.a4e5da","440de7c7.eb6d48"]]},{"id":"f3ac9999.c58e48","type":"switch","z":"c20c2bf8.f5bba8","name":"Check if my Internet is up","property":"statusCode","propertyType":"msg","rules":[{"t":"eq","v":"200","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":230,"y":420,"wires":[["fa2dd78f.64ef58"]]},{"id":"aa173003.800e9","type":"http request","z":"c20c2bf8.f5bba8","name":"google.com","method":"GET","ret":"txt","url":"https://www.google.com/","tls":"","x":210,"y":320,"wires":[["f3ac9999.c58e48"]]},{"id":"cc3ecdf3.6ce24","type":"counter","z":"c20c2bf8.f5bba8","name":"count to 3000","init":"3","step":"1","lower":"0","upper":"3000","mode":"increment","outputs":1,"x":1360,"y":160,"wires":[["aeda28f4.55d248"]]},{"id":"419d4a24.ec1604","type":"function","z":"c20c2bf8.f5bba8","name":"reset counter","func":"msg.reset = true; return msg","outputs":1,"noerr":0,"x":1370,"y":240,"wires":[["cc3ecdf3.6ce24"]]},{"id":"e540e4d1.e10a98","type":"file","z":"c20c2bf8.f5bba8","name":"Write www.log","filename":"/root/iot_data/www.log","appendNewline":true,"createDir":false,"overwriteFile":"false","x":1820,"y":600,"wires":[[]]},{"id":"11c46064.1ffc7","type":"function","z":"c20c2bf8.f5bba8","name":"Add time to data","func":"var timenow=flow.get('time');\nmsg.payload = msg.payload + ' ' + timenow + ' #myhost';\nreturn msg;","outputs":1,"noerr":0,"x":1600,"y":620,"wires":[["e540e4d1.e10a98","c51c74c3.bdf448"]]},{"id":"aeda28f4.55d248","type":"function","z":"c20c2bf8.f5bba8","name":"Set downmin","func":"flow.set(\"downmin\", msg.count);","outputs":1,"noerr":0,"x":1550,"y":160,"wires":[[]]},{"id":"c51c74c3.bdf448","type":"twitter out","z":"c20c2bf8.f5bba8","twitter":"","name":"Tweet","x":1790,"y":640,"wires":[]},{"id":"4c25ef47.71b94","type":"twitter out","z":"c20c2bf8.f5bba8","twitter":"","name":"Tweet","x":1790,"y":520,"wires":[]}]Apa yang dilakukan aliran ini
- Memeriksa apakah ada akses Internet
- Memeriksa apakah ada akses ke situs
- Jika tidak ada akses / restore tweet tentang hal itu
- Menghitung berapa lama situs tidak aktif
- Menulis log ke file
Apa yang perlu dikonfigurasi
- simpul 1: Anda perlu menulis alamat situs untuk pemantauan
- Node 2: Anda perlu mengatur bagian pertama teks untuk tweet
- node 3: Di sini data sementara ditambahkan ke tweet, Anda juga dapat menambahkan teks Anda sendiri
- - node 4: Di sini Anda perlu mengatur akun Twitter Anda dan folder untuk file log setelah perubahan, jangan lupa klik Deploy
Bagaimana itu bekerja
Kami mulai dari kiri atas
- node [timestamp] - menulis waktu ke variabel waktu
- Simpul [Dimulai!] - menyetel ulang penghitung peristiwa di awal, dan menyetel pemicu
- node [1 menit] - memulai proses pemantauan setiap menit.
Pertama-tama, kami akan memeriksa apakah node Internet [google.com]> [Periksa apakah Internet saya aktif] jika kami menerima respons 200, maka Internet berfungsi untuk kami, jika tidak, maka Internet tidak berfungsi untuk kami atau google.com berbaring
Selanjutnya, kami memeriksa situs [name.com]> ([kata ditemukan di web] [bukan 200 tanggapan]). Di sini kita tidak bisa hanya menunggu 200 tanggapan, itu juga bisa dikeluarkan oleh halaman rintisan (misalnya, non-pembayaran untuk hosting) - oleh karena itu, situs dianggap berfungsi jika ada kata dalam isinya - Saya memiliki ID Google ini. Jika tidak ada jawaban 200 (situs tidak berfungsi sama sekali atau memberikan kesalahan 404, dll.), Maka kami menganggap situs tersebut tidak berfungsi.
Selanjutnya, kami mulai menghitung peristiwa ini, jika 3 pesan tentang situs yang tidak beroperasi datang berturut-turut, maka itu diteruskan ke pemicu - yang melewatkan satu pesan dan diblokir - sehingga tidak banyak tweet yang sama. Agar pemicu mengirim tweet agar berfungsi bahwa semuanya baik-baik saja, Anda memerlukan 5 pesan berturut-turut tentang pekerjaan situs. Penghitung pesan mengatur ulang satu sama lain ketika pesan terjadi, ini memberikan hitungan 3-5 pesan dalam satu baris.
Pemicu ditembakkan ketika yang berlawanan terbuka untuk menerima.