Public/Get-LMAlertRule.ps1

Function Get-LMAlertRule {

    [CmdletBinding(DefaultParameterSetName = 'All')]
    Param (
        [Parameter(ParameterSetName = 'Id')]
        [Int]$Id,

        [Parameter(ParameterSetName = 'Name')]
        [String]$Name,

        [Parameter(ParameterSetName = 'Filter')]
        [Hashtable]$Filter,

        [Int]$BatchSize = 1000
    )
    #Check if we are logged in and have valid api creds
    If ($global:LMAuth.Valid) {
        
        #Build header and uri
        $ResourcePath = "/setting/alert/rules"

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

        #Loop through requests
        While (!$Done) {
            #Build query params
            Switch ($PSCmdlet.ParameterSetName) {
                "All" { $QueryParams = "?size=$BatchSize&offset=$Count&sort=+id" }
                "Id" { $resourcePath += "/$Id" }
                "Name" { $QueryParams = "?filter=name:`"$Name`"&size=$BatchSize&offset=$Count&sort=+id" }
                "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 $global:LMAuth -Method "GET" -ResourcePath $ResourcePath
                $Uri = "https://$($global:LMAuth.Portal).logicmonitor.com/santaba/rest" + $ResourcePath + $QueryParams
    
                #Issue request
                $Response = Invoke-RestMethod -Uri $Uri -Method "GET" -Headers $Headers

                #Stop looping if single device, no need to continue
                If ($PSCmdlet.ParameterSetName -eq "Id") {
                    $Done = $true
                    Return (Add-ObjectTypeInfo -InputObject $Response -TypeName "LogicMonitor.AlertRule")
                }
                #Check result size and if needed loop again
                Else {
                    [Int]$Total = $Response.Total
                    [Int]$Count += ($Response.Items | Measure-Object).Count
                    $Results += $Response.Items
                    If ($Count -ge $Total) {
                        $Done = $true
                    }
                }
            }
            Catch [Exception] {
                $Exception = $PSItem
                Switch ($PSItem.Exception.GetType().FullName) {
                    { "System.Net.WebException" -or "Microsoft.PowerShell.Commands.HttpResponseException" } {
                        $HttpException = ($Exception.ErrorDetails.Message | ConvertFrom-Json).errorMessage
                        $HttpStatusCode = $Exception.Exception.Response.StatusCode.value__
                        Write-Error "Failed to execute web request($($HttpStatusCode)): $HttpException"
                    }
                    default {
                        $LMError = $Exception.ToString()
                        Write-Error "Failed to execute web request: $LMError"
                    }
                }
                Return
            }
        }
        Return (Add-ObjectTypeInfo -InputObject $Results -TypeName "LogicMonitor.AlertRule")
    }
    Else {
        Write-Host "Please ensure you are logged in before running any comands, use Connect-LMAccount to login and try again." -ForegroundColor Yellow
    }
}