AsyncVsSync.swift

do {
    let ip = try IP(localAddress: "127.0.0.1", port: 8080)

    let serverSocket = try TCPServerSocket(ip: ip)
    serverSocket.accept { getClientStream in
        do {
            let clientStream = try getClientStream()
            clientStream.receive(length: Int.max) { getData in
                do {
                    let data = try getData()
                    print("server received: \(data)")
                    clientStream.send(data: data) { success in
                        do {
                            try success()
                        } catch {
                            print("server send error: \(error)")
                        }
                    }
                } catch {
                    print("server receive error: \(error)")
                }
            }
        } catch {
            print("server accept error: \(error)")
        }
    }

    let clientSocket = try TCPClientSocket(ip: ip)
    clientSocket.connect { getClientStream in
        do {
            let clientStream = try getClientStream()
            clientStream.send(data: "hello") { success in
                do {
                    try success()
                } catch {
                    print("client send error: \(error)")
                }
            }
            clientStream.send(data: "world") { success in
                do {
                    try success()
                } catch {
                    print("client send error: \(error)")
                }
            }
            clientStream.receive(length: Int.max) { getData in
                do {
                    let data = try getData()
                    print("client received: \(data)")
                } catch {
                    print("client receive error: \(error)")
                }
            }
        } catch {
            print("client connect error: \(error)")
        }
    }
    main()
} catch {
    print(error)
}

// vs


do {
    let ip = try IP(localAddress: "127.0.0.1", port: 8080)

    co {
        do {
            let serverSocket = try TCPServerSocket(ip: ip)
            let clientStream = try serverSocket.accept()
            let data = clientStream.receive(length: Int.max)
            print("server received: \(data)")
            clientStream.send(data: data)
        catch {
            print(error)
        }
    }

    let clientSocket = try TCPClientSocket(ip: ip)
    let clientStream = try clientSocket.connect()
    try clientStream.send(data: "hello")
    try clientStream.send(data: "world")
    print("client received: \(data)")
} catch {
    print(error)
}