Get-EventSource.ps1
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function Get-EventSource { <# .Synopsis Gets Event Sources .Description Gets Event Sources. Event sources are commands or script blocks that can generate events. Event sources can be implemented in: * A .PS1 file starting with @ * An in-memory scriptblock variable starting with @ * A module command referenced within a PrivateData.OnQ section of the module manifest. .Example Get-EventSource .Example Get-EventSource -Subscription .Link Watch-Event #> [OutputType('Eventful.EventSource', [Management.Automation.CommandInfo], [Management.Automation.PSEventSubscriber], [PSObject])] param( # The name of the event source. [Parameter(ValueFromPipelineByPropertyName)] [string[]] $Name, # If set, will get subscriptions related to event sources. [Parameter(ValueFromPipelineByPropertyName)] [switch] $Subscription, # If set, will get source objects from the subscriptions related to event sources. [Parameter(ValueFromPipelineByPropertyName)] [switch] $SourceObject, # If set, will get full help for each event source. [Parameter(ValueFromPipelineByPropertyName)] [switch] $Help ) begin { #region Discover Event Sources $atFunctions = $ExecutionContext.SessionState.InvokeCommand.GetCommands('@*', 'Function',$true)| Where-Object { $_.Value -is [ScriptBlock] } # Save a pointer to the method for terseness and speed. $getCmd = $ExecutionContext.SessionState.InvokeCommand.GetCommand $myInv = $MyInvocation $lookInDirectory = @( "$pwd" $myRoot = $myInv.MyCommand.ScriptBlock.File | Split-Path -ErrorAction SilentlyContinue "$myRoot" if ($myInv.MyCommand.Module) { # Assuming, of course, we have a module. $MyModuleRoot = $myInv.MyCommand.Module | Split-Path -ErrorAction SilentlyContinue if ($MyModuleRoot -ne $myRoot) { "$MyModuleRoot" } } ) | Select-Object -Unique $atScripts = $lookInDirectory | Get-Item | Get-ChildItem -Filter '@*.ps1' | & { process { $getCmd.Invoke($_.Fullname,'ExternalScript') } } # If we had a module, and we still don't have a match, we'll look for extensions. $loadedModules = @(Get-Module) if ($loadedModules -notcontains $myInv.MyCommand.Module) { $loadedModules = @($myInv.MyCommand.Module) + $loadedModules } $extendedCommands = foreach ($loadedModule in $loadedModules) { # Walk over all modules. if ( # If the module has PrivateData keyed to this module $loadedModule.PrivateData.($myInv.MyCommand.Module.Name) ) { # Determine the root of the module with private data. $thisModuleRoot = [IO.Path]::GetDirectoryName($loadedModule.Path) # and get the extension data $extensionData = $loadedModule.PrivateData.($myInv.MyCommand.Module.Name) if ($extensionData -is [Hashtable]) { # If it was a hashtable foreach ($ed in $extensionData.GetEnumerator()) { # walk each key $extensionCmd = if ($ed.Value -like '*.ps1') { # If the key was a .ps1 file $getCmd.Invoke( # treat it as a relative path to the .ps1 [IO.Path]::Combine($thisModuleRoot, $ed.Value), 'ExternalScript' ) } else { # Otherwise, treat it as the name of an exported command. $loadedModule.ExportedCommands[$ed.Value] } if ($extensionCmd) { # If we've found a valid extension command $extensionCmd # return it. } } } } } $allSources = @() + $atFunctions + $atScripts + $extendedCommands $allSources = $allSources | Select-Object -Unique #endregion Discover Event Sources } process { foreach ($src in $allSources) { if ($Name) { $ok = foreach ($n in $Name) { $src.Name -like "$n" -or $src.Name -replace '^@' -replace '\.ps1$' -like "$n" } if (-not $ok) { continue } } if ($Subscription -or $SourceObject) { if (-not $script:SubscriptionsByEventSource) { continue } $eventSourceKey = # Then, if the event source was a script, if ($src -is [Management.Automation.ExternalScriptInfo]) { $src.Path # the key is the path. } elseif ($src.Module) { # If it was from a module $src.Module + '\' + $eventSource.Name # it's the module qualified name. } else { $src.Name # Otherwise, it's just the function name. } if (-not $script:SubscriptionsByEventSource[$eventSourceKey]) { continue } if ($Subscription) { $script:SubscriptionsByEventSource[$eventSourceKey] | Where-Object { [Runspace]::DefaultRunspace.Events.Subscribers -contains $_ } } else { if ($script:SubscriptionsByEventSource[$eventSourceKey].SourceObject) { $script:SubscriptionsByEventSource[$eventSourceKey].SourceObject } else { $jobName = $script:SubscriptionsByEventSource[$eventSourceKey].Name Get-EventSubscriber -SourceIdentifier $jobName -ErrorAction SilentlyContinue | Select-Object -ExpandProperty SourceObject -ErrorAction SilentlyContinue } } continue } $src.pstypenames.clear() $src.pstypenames.add('Eventful.EventSource') if ($Help -and -not $Parameter) { Get-Help $src.EventSourceID -Full continue } $src } } } |