How to get the length of Dimensions array in nodejs? It can possible have 2 blocks or sometimes just 1. I want to write a if condition based on the length. This is inside AWS-Lambda function so I can't use JQ there (I'm not sure if I could).
Example: I want to put these variables inside a if condition based on the length
var sns_DimensionsValue_ApiName = sns.Trigger.Dimensions[0].value;
var sns_DimensionsValue_StageName = sns.Trigger.Dimensions[1].value;
Output of Dimensions array:
"Dimensions": [
{
"value": "zabbixPy-API",
"name": "ApiName"
},
{
"value": "qa",
"name": "Stage"
}
],
In some cases the dimension will have only one item. In this example we have 2 (ApiName and Stage name). It depends on the cloudwatch metric type.
Full output Code:
{
"AlarmName": "Zabbix PY 5XX - By Stage QA",
"AlarmDescription": null,
"AWSAccountId": "123456789",
"NewStateValue": "ALARM",
"NewStateReason": "Threshold Crossed: 1 out of the last 1 datapoints [1.0 (05/11/21 09:54:00)] was greater than or equal to the threshold (1.0) (minimum 1 datapoint for OK -> ALARM transition).",
"StateChangeTime": "2021-11-05T09:55:43.823+0000",
"Region": "Asia Pacific (Mumbai)",
"AlarmArn": "arn:aws:cloudwatch:ap-south-1:123456789:alarm:Zabbix PY 5XX - By Stage QA",
"OldStateValue": "INSUFFICIENT_DATA",
"Trigger": {
"MetricName": "5XXError",
"Namespace": "AWS/ApiGateway",
"StatisticType": "Statistic",
"Statistic": "MINIMUM",
"Unit": null,
"Dimensions": [
{
"value": "zabbixPy-API",
"name": "ApiName"
},
{
"value": "qa",
"name": "Stage"
}
],
"Period": 60,
"EvaluationPeriods": 1,
"ComparisonOperator": "GreaterThanOrEqualToThreshold",
"Threshold": 1,
"TreatMissingData": "- TreatMissingData: missing",
"EvaluateLowSampleCountPercentile": ""
}
}
Native JS arrays have a .length property that you can use for your need.
Works with regular javascript.
var dimLength = sns.Trigger.Dimensions.length;
if(dimLength === 1){
var sns_DimensionsValue_ApiName = sns.Trigger.Dimensions[0].value;
} else if(dimLength === 2){
var sns_DimensionsValue_StageName = sns.Trigger.Dimensions[1].value;
}