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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2018-2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import Basics
import class Foundation.NSLock
import PackageModel
import PackageGraph
import struct TSCBasic.ByteString
import class TSCUtility.FSWatch
/// A file watcher utility for the Package.resolved file.
///
/// This is not intended to be used directly by clients.
final class ResolvedFileWatcher {
private var fswatch: FSWatch!
private var existingValue: ByteString?
private let valueLock = NSLock()
private let resolvedFile: TSCAbsolutePath
public func updateValue() {
valueLock.withLock {
self.existingValue = try? localFileSystem.readFileContents(resolvedFile)
}
}
init(resolvedFile: AbsolutePath, onChange: @escaping () -> ()) throws {
let resolvedFile = TSCAbsolutePath(resolvedFile)
self.resolvedFile = resolvedFile
let block = { [weak self] (paths: [TSCAbsolutePath]) in
guard let self else { return }
// Check if resolved file is part of the received paths.
let hasResolvedFile = paths.contains{ $0.appending(component: resolvedFile.basename) == resolvedFile }
guard hasResolvedFile else { return }
self.valueLock.withLock {
// Compute the contents of the resolved file and fire the onChange block
// if its value is different than existing value.
let newValue: ByteString? = try? localFileSystem.readFileContents(resolvedFile)
if self.existingValue != newValue {
self.existingValue = newValue
onChange()
}
}
}
fswatch = FSWatch(paths: [resolvedFile.parentDirectory], latency: 1, block: block)
try fswatch.start()
}
deinit {
fswatch.stop()
}
}
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