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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2022-2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import NIO
#if os(Linux) || os(Android) || os(Windows)
@preconcurrency import Foundation
#else
import Foundation
#endif
public struct IllegalStreamConsumptionError: Error {
var description: String
}
public struct ChunkSequence: AsyncSequence & Sendable {
private let fileHandle: FileHandle?
private let group: EventLoopGroup
public init(takingOwnershipOfFileHandle fileHandle: FileHandle?, group: EventLoopGroup) {
self.group = group
self.fileHandle = fileHandle
}
public func makeAsyncIterator() -> AsyncIterator {
// This will close the file handle.
AsyncIterator(try! self.fileHandle?.fileContentStream(eventLoop: self.group.any()))
}
public typealias Element = ByteBuffer
public struct AsyncIterator: AsyncIteratorProtocol {
public typealias Element = ByteBuffer
typealias UnderlyingSequence = FileContentStream
private var underlyingIterator: UnderlyingSequence.AsyncIterator?
init(_ underlyingSequence: UnderlyingSequence?) {
self.underlyingIterator = underlyingSequence?.makeAsyncIterator()
}
public mutating func next() async throws -> Element? {
if self.underlyingIterator != nil {
return try await self.underlyingIterator!.next()
} else {
throw IllegalStreamConsumptionError(
description: """
Either `.discard`ed, `.inherit`ed or redirected this stream to a `.fileHandle`,
cannot also consume it. To consume, please `.stream` it.
"""
)
}
}
}
}
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