Created
March 3, 2024 16:05
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Monitor a folder for new files
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import Foundation | |
class FolderMonitor { | |
private var monitoredFolderURL: URL | |
private var folderMonitorQueue: DispatchQueue | |
private var folderMonitorSource: DispatchSourceFileSystemObject? | |
private var lastFileList: [String] = [] | |
init(folderURL: URL) { | |
self.monitoredFolderURL = folderURL | |
self.folderMonitorQueue = DispatchQueue(label: "FolderMonitorQueue", attributes: .concurrent) | |
updateLastFileList() | |
} | |
private func updateLastFileList() { | |
do { | |
let fileList = try FileManager.default.contentsOfDirectory(atPath: monitoredFolderURL.path) | |
self.lastFileList = fileList | |
} catch { | |
print("Failed to fetch file list: \(error)") | |
} | |
} | |
func startMonitoring(completion: @escaping (String) -> Void) { | |
let fileDescriptor = open(monitoredFolderURL.path, O_EVTONLY) | |
guard fileDescriptor != -1 else { | |
print("Unable to open file descriptor.") | |
return | |
} | |
folderMonitorSource = DispatchSource.makeFileSystemObjectSource(fileDescriptor: fileDescriptor, eventMask: .write, queue: folderMonitorQueue) | |
folderMonitorSource?.setEventHandler { [weak self] in | |
guard let self = self else { return } | |
do { | |
let currentFileList = try FileManager.default.contentsOfDirectory(atPath: self.monitoredFolderURL.path) | |
let newFiles = currentFileList.filter { !self.lastFileList.contains($0) } | |
self.lastFileList = currentFileList // Update the last known file list | |
// Notify for each new file found | |
newFiles.forEach { newFile in | |
let fullPath = self.monitoredFolderURL.appendingPathComponent(newFile).path | |
completion(fullPath) | |
} | |
} catch { | |
print("Error listing directory contents: \(error)") | |
} | |
} | |
folderMonitorSource?.setCancelHandler { | |
close(fileDescriptor) | |
} | |
folderMonitorSource?.resume() | |
} | |
func stopMonitoring() { | |
folderMonitorSource?.cancel() | |
folderMonitorSource = nil | |
} | |
} | |
// Example usage | |
let folderURL = URL(fileURLWithPath: "/path/to/your/folder") | |
let folderMonitor = FolderMonitor(folderURL: folderURL) | |
folderMonitor.startMonitoring { filePath in | |
print("A new file has been created at: \(filePath)") | |
} | |
// To stop monitoring, you can call: | |
// folderMonitor.stopMonitoring() |
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