82 lines
2.5 KiB
Swift
82 lines
2.5 KiB
Swift
// Copyright 2020 Carton contributors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import AsyncHTTPClient
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import NIO
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import NIOHTTP1
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final class FileDownloadDelegate: HTTPClientResponseDelegate {
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typealias Response = (totalBytes: Int?, receivedBytes: Int)
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private var totalBytes: Int?
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private var receivedBytes = 0
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private let handle: NIOFileHandle
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private let io: NonBlockingFileIO
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private let reportHead: ((HTTPResponseHead) -> ())?
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private let reportProgress: ((_ totalBytes: Int?, _ receivedBytes: Int) -> ())?
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private var writeFuture: EventLoopFuture<()>?
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init(
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path: String,
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pool: NIOThreadPool = NIOThreadPool(numberOfThreads: 1),
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reportHead: ((HTTPResponseHead) -> ())? = nil,
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reportProgress: ((_ totalBytes: Int?, _ receivedBytes: Int) -> ())? = nil
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) throws {
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handle = try NIOFileHandle(path: path, mode: .write, flags: .allowFileCreation())
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pool.start()
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io = NonBlockingFileIO(threadPool: pool)
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self.reportHead = reportHead
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self.reportProgress = reportProgress
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}
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func didReceiveHead(
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task: HTTPClient.Task<Response>,
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_ head: HTTPResponseHead
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) -> EventLoopFuture<()> {
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reportHead?(head)
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if let totalBytesString = head.headers.first(name: "Content-Length"),
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let totalBytes = Int(totalBytesString)
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{
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self.totalBytes = totalBytes
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}
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return task.eventLoop.makeSucceededFuture(())
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}
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func didReceiveBodyPart(
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task: HTTPClient.Task<Response>,
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_ buffer: ByteBuffer
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) -> EventLoopFuture<()> {
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receivedBytes += buffer.readableBytes
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reportProgress?(totalBytes, receivedBytes)
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let writeFuture = io.write(fileHandle: handle, buffer: buffer, eventLoop: task.eventLoop)
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self.writeFuture = writeFuture
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return writeFuture
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}
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func didFinishRequest(task: HTTPClient.Task<Response>) throws -> Response {
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writeFuture?.whenComplete { [weak self] _ in
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// swiftlint:disable:next force_try
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try! self?.handle.close()
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self?.writeFuture = nil
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}
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return (totalBytes, receivedBytes)
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}
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}
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