Create a json document based on existing document with powershell 5.1 - json

Question

I'm trying to build a json document which takes it's structure, column names and some values from an already existing base json document, and sets other values to variables assigned via powershell 5.1 in a foreach-object loop.
I tried editing a copy of the base json and creating a new one entirely and I can get close to what I want but not exactly.
A cut down example json document is:
[
{
"name": "Application1",
"tags": ["monitor"],
"description": "Get information about application 1.",
"query":
[
{
"target": {
"version": ["v1","v2","v3","v4","v5"],
"platform": ["Windows","Linux"]
},
"implementation": {
"action": "do something"
}
}
]
},
{
"name": "Application2",
"tags": ["monitor"],
"description": "Get information about application 2",
"query":
[
{
"target": {
"version": ["v1","v2","v3"],
"platform": ["Windows"]
},
"implementation": {
"action": "do something for v1, v2 and v3"
}
},
{
"target": {
"version": ["v4","v5"],
"platform": ["Windows"]
},
"implementation": {
"action": "do something for v4 and v5"
}
}
]
}
]
My script currently looks like:
$BaseJson = (Get-Content "$SourcePath\probes.json" | ConvertFrom-Json)
$ClientConfig = #"
{
"targetHost": "$DigitalSymphonyHost",
"targetPort": "$DigitalSymphonyPort",
"source": "$TargetSqlInstance",
"sensor": {}
}
"#
$ClientJson = ConvertFrom-Json -InputObject $ClientConfig
$BaseJson | Where-Object {$_.tags -contains "monitor"} | ForEach-Object {
# For each sensor in the base-sensors json document
$SensorName = $_.name
$Severity = 2
$Version = $_.query.target.version
$Platform = $_.query.target.platform
$Query = $_.query.implementation.action
$Sensor =#"
{
"severity": "$Severity",
"sensorId": "$SensorId",
"type": "$Type",
"target": {
"version": "$Version",
"platform": "$Platform",
"engineEdition": "$Edition"
},
"implementation": {
"query": "$Query"
}
}
"#
$ClientJson.sensor | Add-Member -Name $SensorName -Value (ConvertFrom-Json $Sensor) -MemberType NoteProperty
}
$ClientJson | ConvertTo-Json | Out-File "$DestinationPath\client-sensors.json"
My desired result is to add the $SensorId as per:
[
{
"targetHost": "servername",
"targetPort": "port",
"source": "servername",
"sensor": [{
"name": "Application1",
"sensorId": "<value_from_$SensorId>",
"tags": [],
"description": "Get information about application 1.",
"query":
[
{
"target": {
"version": ["v1","v2","v3","v4","v5"],
"platform": ["Windows","Linux"]
},
"implementation": {
"action": "do something"
}
}
]
},
{
"name": "Application2",
"sensorId": "<value_from_$SensorId>",
"tags": [],
"description": "Get information about application 2",
"query":
[
{
"target": {
"version": ["v1","v2","v3"],
"platform": ["Windows"]
},
"implementation": {
"action": "do something for v1, v2 and v3"
}
},
{
"target": {
"version": ["v4","v5"],
"platform": ["Windows"]
},
"implementation": {
"action": "do something for v4 and v5"
}
}
]
}]
}
]
My current result is
{
"targetHost": "servername",
"targetPort": "port",
"source": "server",
"sensor": {
"applicationname1": {
"tags": ["monitor],
"description": "Get information about application 2",
"sensorId": "420",
"target": "#{version=v1,v2,v3,v4,v5; platform=Windows Windows;}",
"action": "do something for v4 and v5"
}
}
}

Answer 1

I'm not sure where you're getting sensorID, but I'd do this more like the below:
param(
$SourcePath = $PSScriptRoot,
$DestinationPath = $PSScriptRoot,
$DigitalSymphonyHost = 'SomeHost',
$DigitalSymphonyPort = '8765',
$TargetSqlInstance
)
$BaseObj = (Get-Content "$SourcePath\probes.json" | ConvertFrom-Json)
$Client = [PSCustomObject] #{
targetHost = $DigitalSymphonyHost
targetPort = $DigitalSymphonyPort
source = $TargetSqlInstance
sensor = #()
}
$BaseObj | Where-Object {$_.tags -contains "monitor"} | ForEach-Object {
$sensor = $_
# TODO: How are you getting sensorId?
$sensor | Add-Member -Name 'sensorId' -Value 777 -MemberType NoteProperty
$Client.sensor += $sensor
}
ConvertTo-Json #($Client) -Depth 10 | Out-File "$DestinationPath\client-sensors.json" -Force
That will get you the JSON you're looking for.