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Denys
Denys

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Node-red Interlude. Chapter 1

Have you heard something about node-red? Not? Check my previous article out. Here we go.

TL;DR

So, It's the first chapter of the "Blind Inception" trilogy.
I wanna tell a story about some confused and perplexing things. I will use some diagrams and code examples for better understanding.

Prerequisites

Hmm, I guess some knowledge of NodeJS and JS, ofc. And, ... will be good if you understand JS under the hood, but don't worry, I will explain it simply.

  • node-red
  • MongoDB
  • NodeJS

For what?

A lot of Iot devices don't have enough memory to store everything that developers want. This post is about how to save memory on IoT devices, cuz it's a main problem on IoT devices.

Intro

This a part of a story for a year, that was filled with JS pain and some curiosity to deep dive into this rabbit hole.

Some of these articles may be helpful for debugging or some extra things like "detect memory leaks".

Node-red Playground

If u want to test it by urself u can import it inside ur node-red playground.
Follow these steps:

  • install node-red: npm i -g node-red
  • run node-red: node-red
  • go to localhost:1880
  • click import and paste:
[ { "id": "1c61e459343a71fb", "type": "tab", "label": "Simulate", "disabled": false, "info": "", "env": [] }, { "id": "7e630719369e78fb", "type": "function", "z": "1c61e459343a71fb", "name": "middleware", "func": "\nreturn msg;", "outputs": 1, "timeout": 0, "noerr": 0, "initialize": "", "finalize": "", "libs": [], "x": 630, "y": 460, "wires": [ [ "4bad1d183c8673ee" ] ] }, { "id": "4bad1d183c8673ee", "type": "debug", "z": "1c61e459343a71fb", "name": "debug 33", "active": true, "tosidebar": true, "console": false, "tostatus": false, "complete": "true", "targetType": "full", "statusVal": "", "statusType": "auto", "x": 780, "y": 460, "wires": [] }, { "id": "895b7eb7aaabdc9a", "type": "mongodb4", "z": "1c61e459343a71fb", "clientNode": "132a80320b23995d", "mode": "collection", "collection": "mqtt", "operation": "find", "output": "toArray", "maxTimeMS": "0", "handleDocId": false, "name": "", "x": 490, "y": 460, "wires": [ [ "7e630719369e78fb" ] ] }, { "id": "07ed942530c7c97a", "type": "inject", "z": "1c61e459343a71fb", "name": "trigger", "props": [], "repeat": "", "crontab": "", "once": false, "onceDelay": 0.1, "topic": "", "x": 230, "y": 460, "wires": [ [ "63bd53ca32516497" ] ] }, { "id": "63bd53ca32516497", "type": "function", "z": "1c61e459343a71fb", "name": "query", "func": "msg.payload = [{},{limit: 160000}]\n\nreturn msg\n", "outputs": 1, "timeout": 0, "noerr": 0, "initialize": "", "finalize": "", "libs": [], "x": 370, "y": 460, "wires": [ [ "895b7eb7aaabdc9a" ] ] }, { "id": "432acb2349a3e856", "type": "comment", "z": "1c61e459343a71fb", "name": "Fill DB", "info": "", "x": 230, "y": 120, "wires": [] }, { "id": "5f22817afd4d56c8", "type": "inject", "z": "1c61e459343a71fb", "d": true, "name": "trigger", "props": [ { "p": "payload" } ], "repeat": "0.01", "crontab": "", "once": false, "onceDelay": 0.1, "topic": "", "payload": "{     \"r1jAe9RYK2\": 2018320,     \"RbURsNbZJX\": 3527792,     \"KxwwAf9gPa\": 457659,     \"dpSgixDkmM\": 2553056,     \"mYwb6M7bQQ\": 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\"u6iQBx9UFG\": 1089063,     \"9ixrQfTupT\": 2003770,     \"jsuWJTrHnb\": 3513166,     \"1uoyUu3502\": 520699,     \"ShYBkCaWGv\": 832117,     \"2cP8sKt0qO\": 4714219,     \"LT3tjB0fW3\": 3915030,     \"PpvrmReHfB\": 321702,     \"8TDNA3by8F\": 4805615,     \"7skX62B6qk\": 989314,     \"xscEXdfXCD\": 3292419,     \"HPtffHquMh\": 1575132,     \"KCSWI1B1tE\": 2909236,     \"RJC5mFBLYH\": 3322477,     \"NGE08LjWvV\": 3708578,     \"ZEkjJaQbIA\": 4152218,     \"AzXj8KJuoW\": 3772926,     \"UZrvThxoaD\": 2032431,     \"L7aitjpBTY\": 2968894,     \"4HnRapSwgD\": 2484536,     \"rbZ3qNhdad\": 2954873,     \"15nCs5Pi0P\": 1661091,     \"dC0Pu0ZhA7\": 215522,     \"9natagcfNo\": 242482,     \"qpWqONdOE0\": 1871570,     \"1Qf0Hl1i79\": 2447758,     \"Y7oFCOd7nt\": 1367718,     \"shO7keKiah\": 3899498,     \"FhlZn5fHD1\": 2882047,     \"uG1lQvA9Vc\": 2169851,     \"Vt5rDYFNef\": 3256285,     \"RaWd3USUfO\": 1305058,     \"c6jxbhFkuc\": 2148304,     \"veJYsWJ0SA\": 1228499,     \"swZRU6HTd6\": 1289118,     \"DS53CJBUyu\": 5158623,     \"vv26SYLCsn\": 2742898,     \"sxlhnh1QOR\": 5081756,     \"EoZ7kZwWwD\": 3435295,     \"GYqPRsBEeC\": 3539833,     \"IbIZ38TFUG\": 1286532,     \"twiB4m3ngL\": 579895,     \"zsLpgMcQSb\": 600709,     \"0Jq7CTl9te\": 2924707,     \"sqWNwsSbD7\": 1910176,     \"g2GwqAsV93\": 3252965,     \"JcMbVRT1Cx\": 2026226,     \"3Dvm8M1Xk8\": 1447019,     \"PR193lcX46\": 192447,     \"YA5Zvw39hm\": 845969,     \"EcJnxaCc5S\": 319078,     \"VCyYOhoS2f\": 1764960,     \"ool5QOJYH2\": 4516819,     \"53LADEkGX0\": 1535074,     \"zYgjTkArEk\": 4745549,     \"VRHCs4Pk6p\": 813947,     \"ONky6PRwlK\": 3595456,     \"W046acvaUo\": 5032677,     \"rU1UPwfFhh\": 2917685,     \"yxxHKg5i5Q\": 879177,     \"o7yY7jHW63\": 2313408 }", "payloadType": "json", "x": 240, "y": 200, "wires": [ [ "6e7363ce0516d9cf" ] ] }, { "id": "6e7363ce0516d9cf", "type": "function", "z": "1c61e459343a71fb", "name": "insert", "func": "const keys = Object.keys(msg.payload)\nconst key = Math.random().toString().substring(2)\nconst payload = keys.reduce((acc,_key) =>{\n    acc[_key] = gen()\n    return acc\n},{})\nconst ts = new Date()\nconst timeString = ts.toLocaleDateString() + formatTimeString(ts.toLocaleTimeString())\nconst timeObj = { TimeStr: formatDateString(timeString), TimeInt: ts.getTime()}\nconst MSG = {payload: {[key]: payload}, ...timeObj}\n\nfunction gen(min = 1_000_000,max=5_000_000){\n    return Math.floor(Math.random() * (max - (min)) + min)\n}\nfunction formatDateString(dateString){\n    return dateString.replace('AM', '').replace('PM','').replaceAll(' ','')\n}\nfunction formatTimeString(str){\n    const regex = /\\w\\w\\:\\w\\w\\:\\w\\w/\n\n    return str.match(regex) ? str : `0${str}`\n}\nreturn MSG;", "outputs": 1, "timeout": 0, "noerr": 0, "initialize": "", "finalize": "", "libs": [], "x": 370, "y": 200, "wires": [ [ "50a006a13902fcf0" ] ] }, { "id": "50a006a13902fcf0", "type": "mongodb4", "z": "1c61e459343a71fb", "clientNode": "132a80320b23995d", "mode": "collection", "collection": "mqtt", "operation": "insertOne", "output": "toArray", "maxTimeMS": "0", "handleDocId": false, "name": "", "x": 520, "y": 200, "wires": [ [] ] }, { "id": "03fb989f55554172", "type": "comment", "z": "1c61e459343a71fb", "name": "Playground", "info": "", "x": 230, "y": 400, "wires": [] }, { "id": "132a80320b23995d", "type": "mongodb4-client", "name": "", "protocol": "mongodb", "hostname": "127.0.0.1", "port": "27017", "dbName": "iot", "appName": "", "authSource": "", "authMechanism": "DEFAULT", "tls": false, "tlsCAFile": "", "tlsCertificateKeyFile": "", "tlsInsecure": false, "connectTimeoutMS": "", "socketTimeoutMS": "", "minPoolSize": "", "maxPoolSize": "", "maxIdleTimeMS": "", "uri": "", "advanced": "", "uriTabActive": "tab-uri-simple" } ]
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  • click on disabled tigger and click enable
  • re-deplout on the top right corner
  • await fill db to approximately ~160k payloads
  • disabled and re-deploy on the top right corner
  • use tigger under playground comment to test it.
  • use any monitor to check RAM usage

Preview

If u don't like to play with some playground and test it by urself, I have preview how it works.
I use system-monitor on archlinux to monitor RAM usage.
The starting point is:
Image description
This is memory usage after node-red start-up.
Now I will trigger the data collection function from the mongodb and u can see a gif with a problem...

Image description

You can see on a gif increasing memory usage when the data is collected from Mongodb.

But the real problem is the memory stuck in the end:

Image description
here CPU is 0%, which tells us that Mongodb ended up, but memory is 2.4GB as a result and it's a problem with GC and other stuff around it. It tells us that the node-red has leaks, and not only node-red but packages for node-red too.

Solution

For Solution we can trigger GC, there are a couple of packages for it:

  • node-red-contrib-gc-trigger
  • node-red-contrib-gc

or use another solution...

[{"id":"0827bfc6d8b563da","type":"mongodb4","z":"1c61e459343a71fb","clientNode":"132a80320b23995d","mode":"collection","collection":"mqtt","operation":"find","output":"toArray","maxTimeMS":"0","handleDocId":false,"name":"","x":510,"y":700,"wires":[["03dba01640826b64"]]},{"id":"45492c454bcc81f8","type":"inject","z":"1c61e459343a71fb","name":"trigger","props":[],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":230,"y":700,"wires":[["ee83bc446adf6184"]]},{"id":"ee83bc446adf6184","type":"function","z":"1c61e459343a71fb","name":"query","func":"const MSG = {}\nconst clear = flow.get('clear')\nconst trigger = msg.trigger\nconst query = {}\nMSG.payload = [query,{limit: 100000}]\nif(trigger){\n    MSG.payload = [query,{limit: 1}]\n    flow.set('clear',true)\n}\nreturn MSG\n","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":370,"y":700,"wires":[["0827bfc6d8b563da"]]},{"id":"6bf59b41d02b845d","type":"comment","z":"1c61e459343a71fb","name":"Solution","info":"","x":200,"y":640,"wires":[]},{"id":"03dba01640826b64","type":"function","z":"1c61e459343a71fb","name":"middleware","func":"const MSG = {}\nconst {payload} = msg\nMSG.payload = payload\nMSG.trigger = flow.get('clear') ? false : true\n\nreturn [{trigger: MSG.trigger},{payload: MSG.payload}]","outputs":2,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":390,"y":860,"wires":[["5e1f9a17b75fc33b"],["8661b33ab8b630f7"]]},{"id":"8661b33ab8b630f7","type":"debug","z":"1c61e459343a71fb","name":"debug 34","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":540,"y":900,"wires":[]},{"id":"5e1f9a17b75fc33b","type":"switch","z":"1c61e459343a71fb","name":"","property":"trigger","propertyType":"msg","rules":[{"t":"true"},{"t":"else"}],"checkall":"true","repair":false,"outputs":2,"x":550,"y":800,"wires":[["ee83bc446adf6184"],["bf42b0049511ef6b"]]},{"id":"bf42b0049511ef6b","type":"function","z":"1c61e459343a71fb","name":"clear","func":"flow.set('clear',false)","outputs":0,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":710,"y":800,"wires":[]},{"id":"132a80320b23995d","type":"mongodb4-client","name":"","protocol":"mongodb","hostname":"127.0.0.1","port":"27017","dbName":"iot","appName":"","authSource":"","authMechanism":"DEFAULT","tls":false,"tlsCAFile":"","tlsCertificateKeyFile":"","tlsInsecure":false,"connectTimeoutMS":"","socketTimeoutMS":"","minPoolSize":"","maxPoolSize":"","maxIdleTimeMS":"","uri":"","advanced":"","uriTabActive":"tab-uri-simple"}]
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In this solution, we re-trigger the flow with 1 limit to trigger GC with new data equal [one_element].

Future plans

I spent a lot of time debugging this during the IoT project, and I have a couple of solutions for it. The next article will be about debugging and possible fixes \ solutions around it.

Problematic for debugging

The main problem is node-red leaks. We have a nested object and GC cannot clear it cuz we use it in the next functions or messages \ debugs. In the node-red, all communication with nodes is wrapped into an object and it cause a lot of problems.

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