Automatically reconnect clunky wireguard on Ubuntu

ubuntu-wireguard-restart-script.fish

#! /usr/local/bin/fish

# Returns the HTTP Status Code of the HTTP request, connecting to some public
# internet page.
function check_online
  set RESPONSE (curl -m 2 -Is $argv[1] | grep HTTP | cut -d ' ' -f2)
  if test $RESPONSE = ""
    echo "200"
  else
    echo $RESPONSE
  end
end

# Returns the HTTP Status Code of the HTTP request, connecting to some private VPN
# Enabled by Wireguard.
function check_vpn
  curl -m 2 -s https://dev.internal.yourapp.com
  if test $status = "0"
    echo "200"
  else
    echo "400"
  end
end

# Main Program
while true

  # Check if already connected; if so, exit.
  set is_vpn_connected (check_vpn)
  if test $is_vpn_connected = "200"
    echo "😎 Nothing to do; You are already connected to VPN!"
    exit 0
  end

  # Attempt to start up the WireGuard configuration.
  echo "⬆️ Starting wg0"
  wg-quick up wg0;

  sleep 2;

  # Check if you are online.
  set is_internet_okay (check_online http://amionline.net)
  if test $is_internet_okay = "200"
    echo "🚧 Internet OK"
  else
    echo "❌ No internet"
    
    # Wait 3 seconds, before resetting and trying again
    echo "🗑️ Disposing wg0"
    wg-quick down wg0;
    sleep 3
    continue
  end

  sleep 2

  # Check if you have access to the VPN
  set is_vpn_connected (check_vpn)
  if test $is_vpn_connected = "200"
    echo "✅ Successfully connected to VPN!"
    break

  else
    echo "❌ No VPN connection"
    # Wait 1 second before resetting and re-trying again
    sleep 1
    echo "🗑️ Disposing wg0"
    wg-quick down wg0;
    sleep 1;
    continue
  end

  # End
end

Attempting to reconnect on its own

Already connected