Created
February 1, 2018 15:12
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A PowerShell script to monitor a folder and executing Cypher when a new file is added
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| $global:folder = 'c:\temp\imports' # The root folder being monitored. | |
| $filter = '*.csv' # File types we're looking for. | |
| $global:archiveFolder = 'c:\temp\imports\archive' # The archive root folder | |
| $global:cypherShellLocation = 'd:\databases\neo4j\enterprise\neo4j-enterprise-3.3.0\bin\cypher-shell.bat' # The location of the cypher-shell.bat file | |
| $global:user = "neo4j" | |
| $global:password = "neo" | |
| # A watcher to watch | |
| $fsw = New-Object IO.FileSystemWatcher $folder, $filter -Property @{IncludeSubdirectories = $false;NotifyFilter = [IO.NotifyFilters]'FileName, LastWrite'} | |
| # Useful if continually running this in the same session | |
| Get-EventSubscriber -SourceIdentifier "filecreated" | Unregister-Event | |
| $global:parsed = New-Object 'System.Collections.Generic.List[String]' | |
| Register-ObjectEvent $fsw Created -SourceIdentifier FileCreated -Action { | |
| # Setup | |
| $fullPath = $Event.SourceEventArgs.FullPath | |
| $name = $Event.SourceEventArgs.Name | |
| if ($global:parsed.Contains($name)){ | |
| return | |
| } | |
| $global:parsed.Add($name) | |
| $changedPath = $fullPath.Replace("\", "/") | |
| $changeType = $Event.SourceEventArgs.ChangeType | |
| $timeStamp = $Event.TimeGenerated | |
| $log = "$folder\log.txt" | |
| $date = Get-Date | |
| Write-Host "'$fullPath' was $changeType at $timeStamp" -fore green | |
| Out-File -FilePath $log -Append -InputObject "[$date] Parsing '$fullPath' ($changeType at $timeStamp)" | |
| # Generate the command | |
| $command = $cypherShellLocation + ' -u ' + $global:user + ' -p ' + $global:password + ' "USING PERIODIC COMMIT 5000 LOAD CSV WITH HEADERS FROM ''file:///' + $changedPath + ''' AS line CREATE (i:Item {Id: line[''Id''], Name: line[''Name'']})"' | |
| $date = Get-Date | |
| Write-Host "Will Execute: $command" -ForegroundColor Cyan | |
| Out-File -FilePath $log -Append -InputObject "[$date] Executing: $command" | |
| # Actually invoke! | |
| Invoke-Expression $command | |
| # Log completion | |
| $date = Get-Date | |
| Out-File -FilePath $log -Append -InputObject "[$date] '$fullPath' completed import." | |
| $archivedPath = Join-Path $global:archiveFolder $name | |
| # Archive the file | |
| $date = Get-Date | |
| Copy-Item $fullPath $archivedPath -Force | |
| Write-Host "Archived $fullPath to $archivedPath" -ForegroundColor Cyan | |
| Out-File -FilePath $log -Append -InputObject "[$date] Archived $fullPath to $archivedPath" | |
| # Because neo holds onto files - we can try to delete the file, but it's unlikely to work :( | |
| try | |
| { | |
| Remove-Item $fullPath -ErrorAction Stop | |
| $global:parsed.Remove($name) | |
| } | |
| catch { | |
| Write-Host "Couldn't delete $fullPath - probably locked by Neo4j LOAD CSV handler - it is safe to delete." -ForegroundColor Red | |
| } | |
| Foreach($file in $global:parsed){ | |
| try{ | |
| $tempPath = Join-Path $global:folder $file | |
| Write-Host " Attempting to remove $tempPath" | |
| Remove-Item $tempPath -ErrorAction Stop | |
| } | |
| catch{ | |
| } | |
| } | |
| } |
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