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RUNUO_TO_MODERNUO.md

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From RunUO to ModernUO

RunUO was built using C# from .NET 1.1 in 2002. There have been massive changes to technology in the past 20+ years. We believe it is time for Ultima Online to take advantage of this technology so a server can provide a richer experience with never before seen scale.

While it is possible (and many have done it) to migrate an active server from RunUO to ModernUO, it is a daunting task. Please ask for help in our discord!

Technology

RunUO ModernUO
Language C# 4 C# 11 (.NET 8)
Supported OS 32 & 64bit Windows or Mono 64bit Windows, MacOS & Linux
IDEs VS, VSCode VS 2022+ or Rider 2023+

Code API Changes

  • ModernUO can use source generators to serialization/deserialization automatically.
    • This is the biggest change to the API! While intimidating and different, it unlocks the ability for ModernUO to only serialize data that has changed.
    • We estimate a world save with 10mill objects on a busy server will take less than 1 second.
    • This feature is optional and will remain optional indefinitely.
  • Serialize(GenericWriter writer) and equiv deserialize was changed to Serialize(IGenericWriter writer).
  • The following now use generics, e.g. BeginAction(typeof(X)) is now BeginAction<X>.
    • CanBeginAction, BeginAction and EndAction
    • FindRegion and IsPartOf
    • FindGump, HasGump, and CloseGump
  • Functions such as OnAdded(object) for both Items/Mobiles are now OnAdded(IEntity).
  • Most delegate have been changed to Action.
    • Example: EventSink.PlayerDeath += new PlayerDeathEventHandler(EventSink_PlayerDeath); is now EventSink.PlayerDeath += EventSink_PlayerDeath;.
  • ObjectPropertyList is now IPropertyList,
    • Example: GetProperties(ObjectPropertyList list) is now GetProperties(IPropertyList list).
  • [Constructable] attribute is now [Constructible].

Object Property List API Changes

ObjectPropertyList has been drastically optimized, which means the API has been modernized:

❌ Not valid

list.Add(1061837, "{0}\t{1}", m_CurArcaneCharges, m_MaxArcaneCharges);

✅

list.Add(1061837, $"{_curArcaneCharges}\t{_maxArcaneCharges}");

Clilocs that use arguments:

❌ Not valid

list.Add(1060659, "Level\t{1}", m_Level);

✅ - Note the string as an argument, this is mandatory!

list.Add(1060659, $"{"Level"}\t{Level}"); // ~1_val~: ~2_val~

Clilocs that use other clilocs as an argument:

❌ Do not prepend #

list.Add(1060830, $"#{dirt.ToString()}");

✅ Use the new custom cliloc argument formatter

list.Add(1060830, $"{dirt:#}");

Core Changes

  • ModernUO is not inherently thread safe. Overall infrastructure improved with CPU and minimizing memory garbage in mind.
  • Timer system improved drastically by using Timer Wheels.
  • Networking is 5-10x faster by using fixed Circular Buffers.
  • Network packets are no longer objects and write directly to the network buffer, improving performance by 10x.
  • World saves are 30x faster by saving to memory and flushing to disk in the background.
  • Improved RNG accuracy and performance by 5x using Xoshiro256++
  • Converted quite a bit of configuration to JSON with a central settings file.
  • Logging changed from Console.WriteLine to Serilog (still work in progress).
  • Eliminated calling DateTime.Now which had a huge performance penalty.
  • Accounts are now saved to a binary file (will eventually change to a databse) to improve world save performance by eliminating XML.
  • Strings are now built using the new interpolated string syntax, and highly performant string builders.

New Features

  • IPv6 support.
  • Generic serialization that is automatically done in parallel with the world save.
    • The faction system is no longer powered by a single item and instead uses generic persistence.
  • Timezone support for custom scripts that might need it.
  • Hourly/daily/weekly/monthly backups & archiving using Z-Standard.
  • Client version detection (including CUO) for easy configuration.
  • Localization (Cliloc) support.
  • Better encryption for passwords using Argon2.
  • Packet throttling that is configurable per packet and per connection.
  • Enable packet logging per connection.
  • Owner accounts can be protected from being locked out. The first account created is automatically added to this list.
  • Use optional arguments from constructors for Add command.
  • Captures Razor version and displays it in client gump
  • Spawners can be exported/imported using commands and use a GUID for replacement.

Major Feature Changes

  • By default, world saves are now every 5th minute of a real world hour.
    • E.g. 5:00, 5:05, 5:10, regardless of when the server is booted.
  • Some items have their constructor arguments rearranged.

Changes to UO Mechanics

  • Min/max skill requirements for magery adjusted to be accurate to OSI
  • Buffs/Curses now apply appropriately

Removed Features

  • Reporting
  • Remote Admin
  • My RunUO
  • Event Log
  • DocsGen command

New Development Features & Changes