functions/Get-DbaXEObject.ps1

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function Get-DbaXEObject {
    <#
        .SYNOPSIS
        Gets a list of trace(s) from specied SQL Server Instance
 
        .DESCRIPTION
        This function returns a list of Traces on a SQL Server Instance and identify the default Trace File
 
        .PARAMETER SqlInstance
        A SQL Server instance to connect to
 
        .PARAMETER SqlCredential
        A credeial to use to conect to the SQL Instance rather than using Windows Authentication
 
        .PARAMETER Type
        Used to specify the type. Valid types include:
 
            Action
            Event
            Map
            Message
            PredicateComparator
            PredicateSource
            Target
            Type
 
        .PARAMETER EnableException
        By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.
        This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.
        Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.
 
        .NOTES
        Tags: ExtendedEvent
        Website: https://dbatools.io
        Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
        License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
 
        .EXAMPLE
        Get-DbaXEObject -SqlInstance sql2016
 
        Lists all the XE Objects on the sql2016 SQL Server
 
        .EXAMPLE
        Get-DbaXEObject -SqlInstance sql2017 -Type Action, Event
 
        Lists all the XE Objects of type action and event on the sql2017 SQL Server
 
#>

    [CmdletBinding()]
    Param (
        [parameter(Position = 0, Mandatory, ValueFromPipeline)]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter[]]$SqlInstance,
        [PSCredential]$SqlCredential,
        [ValidateSet("Type", "Event", "Target", "Action", "Map", "Message", "PredicateComparator", "PredicateSource")]
        [string[]]$Type,
        [switch]$EnableException
    )
    begin {
        if ($Type) {
            $join = $Type -join "','"
            $where = "AND o.object_type in ('$join')"
            $where.Replace("PredicateComparator", "pred_compare")
            $where.Replace("PredicateSource", "pred_source")
            Write-Warning $where
        }
        $sql = "SELECT SERVERPROPERTY('MachineName') AS ComputerName,
                ISNULL(SERVERPROPERTY('InstanceName'), 'MSSQLSERVER') AS InstanceName,
                SERVERPROPERTY('ServerName') AS SqlInstance,
                p.name AS PackageName,
                ObjectType =
                      CASE o.object_type
                         WHEN 'type' THEN 'Type'
                         WHEN 'event' THEN 'Event'
                         WHEN 'target' THEN 'Target'
                         WHEN 'pred_compare' THEN 'PredicateComparator'
                         WHEN 'pred_source' THEN 'PredicateSource'
                         WHEN 'action' THEN 'Action'
                         WHEN 'map' THEN 'Map'
                         WHEN 'message' THEN 'Message'
                         ELSE o.object_type
                      END,
                o.object_type as ObjectTypeRaw,
                o.name AS TargetName,
                o.description as Description
                FROM sys.dm_xe_packages AS p
                JOIN sys.dm_xe_objects AS o ON p.guid = o.package_guid
                WHERE (p.capabilities IS NULL OR p.capabilities & 1 = 0)
                $where
                AND (o.capabilities IS NULL OR o.capabilities & 1 = 0)
                ORDER BY o.object_type
                "

    }
    process {
        foreach ($instance in $SqlInstance) {

            try {
                $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential -MinimumVersion 9
            }
            catch {
                Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue
                return
            }

            try {
                $server.Query($sql) | Select-DefaultView -ExcludeProperty ComputerName, InstanceName, ObjectTypeRaw
            }
            catch {
                Stop-Function -Message "Issue collecting trace data on $server" -Target $server -ErrorRecord $_
            }
        }
    }
}