Public/Get-LMDeviceDatasourceInstance.ps1

<#
.SYNOPSIS
Retrieves instances of a LogicMonitor device datasource.

.DESCRIPTION
The Get-LMDeviceDatasourceInstance function retrieves instances of a LogicMonitor device datasource based on the specified parameters. It requires a valid API authentication and authorization.

.PARAMETER DatasourceName
Specifies the name of the datasource. This parameter is mandatory when using the 'Id-dsName' or 'Name-dsName' parameter sets.

.PARAMETER DatasourceId
Specifies the ID of the datasource. This parameter is mandatory when using the 'Id-dsId' or 'Name-dsId' parameter sets.

.PARAMETER Id
Specifies the ID of the device. This parameter is mandatory when using the 'Id-dsId' or 'Id-dsName' parameter sets. It can also be specified using the 'DeviceId' alias.

.PARAMETER Name
Specifies the name of the device. This parameter is mandatory when using the 'Name-dsName' or 'Name-dsId' parameter sets. It can also be specified using the 'DeviceName' alias.

.PARAMETER Filter
Specifies additional filters to apply to the instances. This parameter accepts an object representing the filter criteria.

.PARAMETER BatchSize
Specifies the number of instances to retrieve per batch. The default value is 1000.

.EXAMPLE
Get-LMDeviceDatasourceInstance -DatasourceName "CPU" -Name "Server01" -BatchSize 500
Retrieves instances of the "CPU" datasource for the device named "Server01" with a batch size of 500.

.EXAMPLE
Get-LMDeviceDatasourceInstance -DatasourceId 1234 -Id 5678
Retrieves instances of the datasource with ID 1234 for the device with ID 5678.

.NOTES
This function requires a valid API authentication and authorization. Use Connect-LMAccount to log in before running any commands.
#>

Function Get-LMDeviceDatasourceInstance {

    [CmdletBinding()]
    Param (
        [Parameter(Mandatory, ParameterSetName = 'Id-dsName')]
        [Parameter(Mandatory, ParameterSetName = 'Name-dsName')]
        [String]$DatasourceName,
    
        [Parameter(Mandatory, ParameterSetName = 'Id-dsId')]
        [Parameter(Mandatory, ParameterSetName = 'Name-dsId')]
        [Int]$DatasourceId,
    
        [Parameter(Mandatory, ParameterSetName = 'Id-dsId')]
        [Parameter(Mandatory, ParameterSetName = 'Id-dsName')]
        [Alias("DeviceId")]
        [Int]$Id,
    
        [Parameter(Mandatory, ParameterSetName = 'Name-dsName')]
        [Parameter(Mandatory, ParameterSetName = 'Name-dsId')]
        [Alias("DeviceName")]
        [String]$Name,

        [Object]$Filter,

        [ValidateRange(1, 1000)]
        [Int]$BatchSize = 1000

    )
    #Check if we are logged in and have valid api creds
    If ($Script:LMAuth.Valid) {

        #Lookup Device Id
        If ($Name) {
            $LookupResult = (Get-LMDevice -Name $Name).Id
            If (Test-LookupResult -Result $LookupResult -LookupString $Name) {
                return
            }
            $Id = $LookupResult
        }

        #Lookup DatasourceId
        If ($DatasourceName -or $DatasourceId) {
            $LookupResult = (Get-LMDeviceDataSourceList -Id $Id | Where-Object { $_.dataSourceName -eq $DatasourceName -or $_.dataSourceId -eq $DatasourceId }).Id
            If (Test-LookupResult -Result $LookupResult -LookupString $DatasourceName) {
                return
            }
            $HdsId = $LookupResult
        }
        
        #Build header and uri
        $ResourcePath = "/device/devices/$Id/devicedatasources/$HdsId/instances"

        #Initalize vars
        $QueryParams = ""
        $Count = 0
        $Done = $false
        $Results = @()

        #Loop through requests
        While (!$Done) {
            #Build query params
            $QueryParams = "?size=$BatchSize&offset=$Count&sort=+id"

            If ($Filter) {
                #List of allowed filter props
                $PropList = @()
                $ValidFilter = Format-LMFilter -Filter $Filter -PropList $PropList
                $QueryParams = "?filter=$ValidFilter&size=$BatchSize&offset=$Count&sort=+id"
            }

            Try {
                $Headers = New-LMHeader -Auth $Script:LMAuth -Method "GET" -ResourcePath $ResourcePath
                $Uri = "https://$($Script:LMAuth.Portal).logicmonitor.com/santaba/rest" + $ResourcePath + $QueryParams
                    
                
                
                Resolve-LMDebugInfo -Url $Uri -Headers $Headers[0] -Command $MyInvocation

                #Issue request
                $Response = Invoke-RestMethod -Uri $Uri -Method "GET" -Headers $Headers[0] -WebSession $Headers[1]

                #Stop looping if single device, no need to continue
                If (![bool]$Response.psobject.Properties["total"]) {
                    $Done = $true
                    Return (Add-ObjectTypeInfo -InputObject $Response -TypeName "LogicMonitor.DeviceDatasourceInstance" )
                }
                #Check result size and if needed loop again
                Else {
                    [Int]$Total = $Response.Total
                    [Int]$Count += ($Response.Items | Measure-Object).Count
                    $Results += $Response.Items
                    If ($Count -ge $Total) {
                        $Done = $true
                    }
                }
            }
            Catch [Exception] {
                $Proceed = Resolve-LMException -LMException $PSItem
                If (!$Proceed) {
                    Return
                }
            }
        }
        Return (Add-ObjectTypeInfo -InputObject $Results -TypeName "LogicMonitor.DeviceDatasourceInstance" )
    }
    Else {
        Write-Error "Please ensure you are logged in before running any commands, use Connect-LMAccount to login and try again."
    }
}