SwiftSocket

SwiftSocket is simple abstraction for sockets on iOS.

Usage

let socket = SocketManager<Payload>(host: "127.0.0.1", port: 1234)

socket.tapInput { [weak self] in
  self?.readResponse($0)
}

socket.open()

...

socket.write(Payload(data: data))

PayloadType

SwiftSocket uses a generic PayloadType to describe the application specific communication protocol of the socket. This PayloadType is specified when the SocketManager instance is created.

This PayloadType is used when writing to and reading from the socket.

protocol PayloadType {
    static var headerSize: Int { get }
    init(data: NSData)
    func networkBytes() -> [UInt8]
}

An example Payload : PayloadType :

class Payload: PayloadType {
  let data: NSData
  func networkBytes() -> [UInt8] {
    return Array(UnsafeBufferPointer(start: UnsafePointer<UInt8>(data.bytes), count: data.length))
  }
  init(data: NSData) {
    self.data = data
  }
  static var headerSize: Int { return strideof(UInt32) }
}

Discussion

This implemention is performant, but simple. A single UInt32 is used as a header for each payload to be transmitted or recieved and indicates the byte-length of the PayloadType to be written or read. This header is transmitted on every write and is expected to be present for every read.