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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2025 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
//
//===----------------------------------------------------------------------===//
public import SWBUtil
import Foundation
#if canImport(System)
import System
#else
import SystemPackage
#endif
/// A CAS object representing a filesystem node
public struct CASFSNode<CAS: CASProtocol>: Sendable {
private enum Errors: Error {
case pathDoesNotExist(Path)
case cannotImportUnsupportedFSObject(Path)
case missingCASObject(CAS.DataID)
case deserializationError(String)
}
private enum Content {
case directory(DirectoryContent)
case symlink(SymlinkContent)
case file(FileContent)
}
private struct DirectoryContent {
let name: String
// TODO: user, mode, group, etc.
let entries: [CAS.DataID]
}
private struct SymlinkContent: Serializable {
let name: String
// TODO: user, mode, group, etc.
let destination: Path
init(name: String, destination: Path) {
self.name = name
self.destination = destination
}
func serialize<T>(to serializer: T) where T : SWBUtil.Serializer {
serializer.beginAggregate(2)
serializer.serialize(name)
serializer.serialize(destination)
serializer.endAggregate()
}
init(from deserializer: any SWBUtil.Deserializer) throws {
try deserializer.beginAggregate(2)
self.name = try deserializer.deserialize()
self.destination = try deserializer.deserialize()
}
}
private struct FileContent {
let filename: String
let chunkSize: Int64
// TODO: user, mode, group, etc.
let chunks: [CAS.DataID]
init(filename: String, chunkSize: Int64, chunks: [CAS.DataID]) {
self.filename = filename
self.chunkSize = chunkSize
self.chunks = chunks
}
}
private let content: Content
private var name: String {
switch content {
case .directory(let directoryContent):
return directoryContent.name
case .symlink(let symlinkContent):
return symlinkContent.name
case .file(let fileContent):
return fileContent.filename
}
}
public static func `import`(path: Path, fs: any FSProxy, cas: CAS) async throws -> CAS.DataID {
guard fs.exists(path) else {
throw Errors.pathDoesNotExist(path)
}
if fs.isSymlink(path) {
let node = CASFSNode(content: .symlink(.init(name: path.basename, destination: try fs.readlink(path))))
return try await node.store(cas: cas)
} else if fs.isDirectory(path) {
let entries = try await fs.listdir(path).concurrentMap(maximumParallelism: 10) { item in
try await CASFSNode.import(path: path.join(item), fs: fs, cas: cas)
}
let node = CASFSNode(content: .directory(.init(name: path.basename, entries: entries)))
return try await node.store(cas: cas)
} else if try fs.isFile(path) {
var chunks: [CAS.DataID] = []
let chunkSize: Int64
if let mappedData = try? fs.readMemoryMapped(path) {
chunkSize = Int64(1024 * 1024 * 4)
let (q, r) = mappedData.count.quotientAndRemainder(dividingBy: numericCast(chunkSize))
let numChunks = q + ((r > 0) ? 1 : 0)
chunks = try await (0..<numChunks).concurrentMap(maximumParallelism: 10) { chunkNum in
let start = Int(chunkNum) * Int(chunkSize)
let end = Int(min((chunkNum + 1) * numericCast(chunkSize), mappedData.count))
let bytes = mappedData[(mappedData.startIndex + start)..<(mappedData.startIndex + end)]
return try await cas.store(object: .init(data: ByteString(bytes), refs: []))
}
} else {
let contents = try fs.read(path)
chunkSize = Int64(contents.count)
chunks.append(try await cas.store(object: .init(data: contents, refs: [])))
}
let node = CASFSNode(content: .file(.init(filename: path.basename, chunkSize: chunkSize, chunks: chunks)))
return try await node.store(cas: cas)
} else {
throw Errors.cannotImportUnsupportedFSObject(path)
}
}
public func export(at path: Path, fs: any FSProxy, cas: CAS) async throws {
guard fs.exists(path.dirname) else {
throw Errors.pathDoesNotExist(path.dirname)
}
switch content {
case .directory(let directoryContent):
try fs.createDirectory(path)
_ = try await directoryContent.entries.concurrentMap(maximumParallelism: 10) { entry in
let entryNode = try await CASFSNode.load(id: entry, cas: cas)
try await entryNode.export(at: path.join(entryNode.name), fs: fs, cas: cas)
}
case .symlink(let symlinkContent):
try fs.symlink(path, target: symlinkContent.destination)
case .file(let fileContent):
do {
try await fs.write(path) { fd in
_ = try await fileContent.chunks.enumerated().asyncMap { (index, chunk) in
guard let casObject = try await cas.load(id: chunk) else {
throw Errors.missingCASObject(chunk)
}
try fd.writeAll(toAbsoluteOffset: Int64(index) * fileContent.chunkSize, casObject.data)
}
}
} catch {
var content = ByteString()
for chunk in fileContent.chunks {
guard let casObject = try await cas.load(id: chunk) else {
throw Errors.missingCASObject(chunk)
}
content += casObject.data
}
try fs.write(path, contents: content)
}
}
}
public func export(into path: Path, fs: any FSProxy, cas: CAS) async throws {
try await export(at: path.join(name), fs: fs, cas: cas)
}
private func store(cas: CAS) async throws -> CAS.DataID {
let dataSerializer = MsgPackSerializer()
var refs: [CAS.DataID] = []
switch content {
case .directory(let directoryContent):
dataSerializer.serialize(0)
dataSerializer.serialize(directoryContent.name)
refs = directoryContent.entries
case .symlink(let symlinkContent):
dataSerializer.serialize(1)
dataSerializer.serialize(symlinkContent)
case .file(let fileContent):
dataSerializer.serialize(2)
dataSerializer.serialize(fileContent.filename)
dataSerializer.serialize(fileContent.chunkSize)
refs = fileContent.chunks
}
return try await cas.store(object: .init(data: dataSerializer.byteString, refs: refs))
}
public static func load(id: CAS.DataID, cas: CAS) async throws -> CASFSNode {
guard let casObject = try await cas.load(id: id) else {
throw Errors.missingCASObject(id)
}
let deserializer = MsgPackDeserializer(casObject.data)
switch try deserializer.deserialize() as Int {
case 0:
return CASFSNode(content: .directory(.init(name: try deserializer.deserialize(), entries: casObject.refs)))
case 1:
return CASFSNode(content: .symlink(try deserializer.deserialize()))
case 2:
let filename: String = try deserializer.deserialize()
let chunkSize: Int64 = try deserializer.deserialize()
return CASFSNode(content: .file(.init(filename: filename, chunkSize: chunkSize, chunks: casObject.refs)))
default:
throw Errors.deserializationError("Unknown content type")
}
}
}
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