This setup is for remote users to connect into an office/home LAN using a VPN (ipsec). This is based on (but not the same as) the strongSwan documentation and this guide: https://raymii.org/s/tutorials/IPSEC_vpn_with_Ubuntu_16.04.html
I used strongSwan 5.5.1.
apt-get install -y strongswan strongswan-pki
State machines are everywhere in interactive systems, but they're rarely defined clearly and explicitly. Given some big blob of code including implicit state machines, which transitions are possible and under what conditions? What effects take place on what transitions?
There are existing design patterns for state machines, but all the patterns I've seen complect side effects with the structure of the state machine itself. Instances of these patterns are difficult to test without mocking, and they end up with more dependencies. Worse, the classic patterns compose poorly: hierarchical state machines are typically not straightforward extensions. The functional programming world has solutions, but they don't transpose neatly enough to be broadly usable in mainstream languages.
Here I present a composable pattern for pure state machiness with effects,
| /* | |
| * Unless explicitly stated otherwise all files in this repository are licensed under the Apache License Version 2.0. | |
| * This product includes software developed at Datadog (https://www.datadoghq.com/). | |
| * Copyright 2019-2020 Datadog, Inc. | |
| */ | |
| import Foundation | |
| public extension URLSession { | |
| internal typealias RequestInterceptor = HookedSession.RequestInterceptor |