Alamofire
.upload(multipartFormData: { mutiparFormData in
mutiparFormData.append("1".data(using: .utf8)!, withName: "OO")
mutiparFormData.append("2".data(using: .utf8)!, withName: "pp")
}, to: "https://www.baidu.com") { result in
}
open func upload(
multipartFormData: @escaping (MultipartFormData) -> Void,
usingThreshold encodingMemoryThreshold: UInt64 = SessionManager.multipartFormDataEncodingMemoryThreshold,
with urlRequest: URLRequestConvertible,
queue: DispatchQueue? = nil,
encodingCompletion: ((MultipartFormDataEncodingResult) -> Void)?)
{
DispatchQueue.global(qos: .utility).async {
let formData = MultipartFormData()
multipartFormData(formData)
var tempFileURL: URL?
do {
var urlRequestWithContentType = try urlRequest.asURLRequest()
urlRequestWithContentType.setValue(formData.contentType, forHTTPHeaderField: "Content-Type")
let isBackgroundSession = self.session.configuration.identifier != nil
if formData.contentLength < encodingMemoryThreshold && !isBackgroundSession {
let data = try formData.encode()
let encodingResult = MultipartFormDataEncodingResult.success(
request: self.upload(data, with: urlRequestWithContentType),
streamingFromDisk: false,
streamFileURL: nil
)
(queue ?? DispatchQueue.main).async { encodingCompletion?(encodingResult) }
} else {
let fileManager = FileManager.default
let tempDirectoryURL = URL(fileURLWithPath: NSTemporaryDirectory())
let directoryURL = tempDirectoryURL.appendingPathComponent("org.alamofire.manager/multipart.form.data")
let fileName = UUID().uuidString
let fileURL = directoryURL.appendingPathComponent(fileName)
tempFileURL = fileURL
var directoryError: Error?
// Create directory inside serial queue to ensure two threads don't do this in parallel
self.sessionManagerSerialQueue.sync {
do {
try fileManager.createDirectory(at: directoryURL, withIntermediateDirectories: true, attributes: nil)
} catch {
directoryError = error
}
}
if let directoryError = directoryError { throw directoryError }
try formData.writeEncodedData(to: fileURL)
let upload = self.upload(fileURL, with: urlRequestWithContentType)
// Cleanup the temp file once the upload is complete
upload.delegate.queue.addOperation {
do {
try FileManager.default.removeItem(at: fileURL)
} catch {
// No-op
}
}
(queue ?? DispatchQueue.main).async {
let encodingResult = MultipartFormDataEncodingResult.success(
request: upload,
streamingFromDisk: true,
streamFileURL: fileURL
)
encodingCompletion?(encodingResult)
}
}
} catch {
// Cleanup the temp file in the event that the multipart form data encoding failed
if let tempFileURL = tempFileURL {
do {
try FileManager.default.removeItem(at: tempFileURL)
} catch {
// No-op
}
}
(queue ?? DispatchQueue.main).async { encodingCompletion?(.failure(error)) }
}
}
}
- 在全局队列处理上传的数据
- multipartFormData(formData) 函数式变成的思想，由外界拼接data
- 判断文件大小，< public static let multipartFormDataEncodingMemoryThreshold: UInt64 = 10_000_000 编码上传
否则写入文件上传
表单数据编码
public func append(_ data: Data, withName name: String) {
let headers = contentHeaders(withName: name)
let stream = InputStream(data: data)
let length = UInt64(data.count)
append(stream, withLength: length, headers: headers)
}
先处理头
private func contentHeaders(withName name: String, fileName: String? = nil, mimeType: String? = nil) -> [String: String] {
var disposition = "form-data; name=\"\(name)\""
if let fileName = fileName { disposition += "; filename=\"\(fileName)\"" }
var headers = ["Content-Disposition": disposition]
if let mimeType = mimeType { headers["Content-Type"] = mimeType }
return headers
}
最后是一个数组 bodyParts
let data = try formData.encode()
public func encode() throws -> Data {
if let bodyPartError = bodyPartError {
throw bodyPartError
}
var encoded = Data()
bodyParts.first?.hasInitialBoundary = true
bodyParts.last?.hasFinalBoundary = true
for bodyPart in bodyParts {
let encodedData = try encode(bodyPart)
encoded.append(encodedData)
}
return encoded
}
private func encode(_ bodyPart: BodyPart) throws -> Data {
var encoded = Data()
let initialData = bodyPart.hasInitialBoundary ? initialBoundaryData() : encapsulatedBoundaryData()
encoded.append(initialData)
let headerData = encodeHeaders(for: bodyPart)
encoded.append(headerData)
let bodyStreamData = try encodeBodyStream(for: bodyPart)
encoded.append(bodyStreamData)
if bodyPart.hasFinalBoundary {
encoded.append(finalBoundaryData())
}
return encoded
}
根据form-data上传的uf8数据结构进行处理
private func encodeBodyStream(for bodyPart: BodyPart) throws -> Data {
let inputStream = bodyPart.bodyStream
inputStream.open()
defer { inputStream.close() }
var encoded = Data()
while inputStream.hasBytesAvailable {
var buffer = [UInt8](repeating: 0, count: streamBufferSize)
let bytesRead = inputStream.read(&buffer, maxLength: streamBufferSize)
if let error = inputStream.streamError {
throw AFError.multipartEncodingFailed(reason: .inputStreamReadFailed(error: error))
}
if bytesRead > 0 {
encoded.append(buffer, count: bytesRead)
} else {
break
}
}
return encoded
}
将数据写入 StreamData 防止内存暴增
写入文件方式 方式的上传
let fileManager = FileManager.default
let tempDirectoryURL = URL(fileURLWithPath: NSTemporaryDirectory())
let directoryURL = tempDirectoryURL.appendingPathComponent("org.alamofire.manager/multipart.form.data")
let fileName = UUID().uuidString
let fileURL = directoryURL.appendingPathComponent(fileName)
tempFileURL = fileURL
var directoryError: Error?
// Create directory inside serial queue to ensure two threads don't do this in parallel
self.sessionManagerSerialQueue.sync {
do {
try fileManager.createDirectory(at: directoryURL, withIntermediateDirectories: true, attributes: nil)
} catch {
directoryError = error
}
}
if let directoryError = directoryError { throw directoryError }
try formData.writeEncodedData(to: fileURL)
let upload = self.upload(fileURL, with: urlRequestWithContentType)
// Cleanup the temp file once the upload is complete
upload.delegate.queue.addOperation {
do {
try FileManager.default.removeItem(at: fileURL)
} catch {
// No-op
}
}
(queue ?? DispatchQueue.main).async {
let encodingResult = MultipartFormDataEncodingResult.success(
request: upload,
streamingFromDisk: true,
streamFileURL: fileURL
)
encodingCompletion?(encodingResult)
}
public func writeEncodedData(to fileURL: URL) throws {
if let bodyPartError = bodyPartError {
throw bodyPartError
}
if FileManager.default.fileExists(atPath: fileURL.path) {
throw AFError.multipartEncodingFailed(reason: .outputStreamFileAlreadyExists(at: fileURL))
} else if !fileURL.isFileURL {
throw AFError.multipartEncodingFailed(reason: .outputStreamURLInvalid(url: fileURL))
}
guard let outputStream = OutputStream(url: fileURL, append: false) else {
throw AFError.multipartEncodingFailed(reason: .outputStreamCreationFailed(for: fileURL))
}
/// 重点
outputStream.open()
defer { outputStream.close() }
self.bodyParts.first?.hasInitialBoundary = true
self.bodyParts.last?.hasFinalBoundary = true
for bodyPart in self.bodyParts {
try write(bodyPart, to: outputStream)
}
}
通过OutputStream写入文件
private func write(_ bodyPart: BodyPart, to outputStream: OutputStream) throws {
try writeInitialBoundaryData(for: bodyPart, to: outputStream)
try writeHeaderData(for: bodyPart, to: outputStream)
try writeBodyStream(for: bodyPart, to: outputStream)
try writeFinalBoundaryData(for: bodyPart, to: outputStream)
}
