Allow Discord bot to start before RCON is available

src/Program.cs

@@ -22,9 +22,6 @@ int interval = int.Parse(Env("AUTO_RESTART_INTERVAL_HOURS", "6"));
 int[] warnings = Env("AUTO_RESTART_WARNING_SECONDS", "600,300,60").Split(',').Select(int.Parse).OrderDescending().ToArray();
 var cooldown = TimeSpan.FromSeconds(int.Parse(Env("MANUAL_RESTART_COOLDOWN_SECONDS", "600")));
 var readyTimeout = TimeSpan.FromSeconds(int.Parse(Env("RESTART_READY_TIMEOUT_SECONDS", "900")));
-var address = (await Dns.GetHostAddressesAsync(Env("RCON_HOST", "zomboid"))).First(x => x.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork);
-using var rcon = new RCON(address, ushort.Parse(Env("RCON_PORT", "27015")), rconPassword,
-    strictCommandPacketIdMatching: false);
 var gate = new SemaphoreSlim(1, 1);
 DateTimeOffset? lastManual = null;
 
@@ -35,7 +32,14 @@ var host = builder.Build();
 
 bool Allowed(ApplicationCommandContext c) => c.Interaction.GuildId == guildId && c.User is GuildInteractionUser u &&
     (roles.Count == 0 || u.RoleIds.Any(roles.Contains));
-async Task<string> Command(string command) => await rcon.SendCommandAsync(command);
+async Task<string> Command(string command, bool allowDisconnect = false)
+{
+    var address = (await Dns.GetHostAddressesAsync(Env("RCON_HOST", "zomboid"))).First(x => x.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork);
+    using var rcon = new RCON(address, ushort.Parse(Env("RCON_PORT", "27015")), rconPassword, strictCommandPacketIdMatching: false);
+    await rcon.ConnectAsync();
+    try { return await rcon.SendCommandAsync(command); }
+    catch when (allowDisconnect && !rcon.Connected) { return ""; }
+}
 async Task<(int Count, string[] Names)> Players()
 {
     string output = await Command("players");
@@ -47,10 +51,7 @@ async Task<(int Count, string[] Names)> Players()
     return (count, names);
 }
 Task Broadcast(string message) => Command($"servermsg \"{message.Replace('"', '\'')}\"");
-async Task Quit()
-{
-    try { await Command("quit"); } catch { if (rcon.Connected) throw; }
-}
+Task Quit() => Command("quit", true);
 async Task Ready(string kind)
 {
     bool stopped = false;