Remote diagnosis project

What does this script do?

• Provides api endpoint to collect remote diagnostics data sent using post request to /add route in a specific format.

Format of the data sent

{
  "Date" : ["2022-01-23", "..."],
  "Time" : ["11:11:02", "..."],
  "vdc" : [33.23, "..."],
  "idc" : [54, "..."],
  "tmot" : [14, "..."],
  "rpm" : [23, "..."],
  "idref" : [3, "..."],
  "tesc" : [21.23, "..."],
}

• All the fields in the above example json should be present.
• Length of Date array === Length of Time array
• The length of rest of the arrays should be 10X the length of Date || Time array

Where the data is stored?

• The data is stored in a time series database called influxDB

Database details

• A bucket is created in influxDB to store diagnostics data.
• The data is written with millisecond precision.
• As per the above JSON format, the metrics are added every 10ms.

Schema

measurement(picID),tags(metric="metric_name(ex: rpm)") values(value=10.23) timestamp(23412343434)

Data in lineformat

213412342134234,metric=tmot tmot=44.97 1668406550000
213412342134234,metric=rpm rpm=0.096 1668406550100
213412342134234,metric=idc idc=0.649 1668406550200
213412342134234,metric=idref idref=0 1668406550300
213412342134234,metric=tesc tesc=27.849 1668406550400
213412342134234,metric=idref idref=0 1668406550500

Databse package

• The .deb package is downloaded from InfluxDB website and is installed manually
• Influx service is started using systemd

Logging

• Grafana loki is used for logging, and logs are sent using Winston custom Transport

Environment Variables

name	value
NODE_ENV	"production" || "development"
INFLUX_URL	"url of influx db database"
INFLUD_ORG	"organization token of influxdb"
PORT	"application port"
LOKI_USERNAME	"username of grafana loki"
GRAFANA_API_KEY	"api key of grafana loki"
INFLUX_BUCKET	"name of influxDB bucket"
INFLUX_TOKEN	"influx db api token"