b0624b2f64
Static constructors are lazily called when the class is first "used" https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/static-constructors > It is called automatically before the first instance is created or any static members are referenced. This means, in particular circumstances, client and server may diverge on which classes they have "loaded" and thus the rpc index will be desynced One such example would be on-demand-loading of prefabs via custom spawn handlers: A game might not want to preload all its monster prefabs since there's quite many of them and it is practically impossible to encounter them all (or even a majority of them) in a single play session. So a custom spawn handler is used to load the monster prefabs on demand. All monsters would have the "Monster" NetworkBehaviour class, which would have a few RPCs on it. Since the monster prefabs are loaded ONLY when needed via a custom spawn handler and the Monster class itself isn't referenced or "loaded" by anything else other than the prefab, the monster classes static constructor will not have been called when a client first joins a game, while it may have been called on the server/host. This will in turn cause Rpc indexes to not match up between client/server By just forcing the static constructors to run via the [RuntimeInitializeOnLoadMethod] attribute this is not a problem anymore, since all static constructors are always run and all RPCs will always be registered by the time they are used |
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It's only the dreamers who ever move mountains.
Mirror
Mirror is a high level Networking library for Unity 2019/2020 LTS, compatible with different low level Transports.
Mirror is for indie games & small MMOs, made by the developers of uMMORPG and Cubica.
Mirror is optimized for ease of use & probability of success.
We needed a networking library that allows us to launch our games and survive the next decade.
Mirror is stable & production ready.
Free & Open
Mirror is free & open source!
- Code: MIT licensed.
- Dedicated Servers: Anywhere!
- Player Hosted: Free Epic Relay!
We need Mirror for our own games, which is why we will never charge anything.
Funded only by Donations from our fantastic community of over 10,000 people.
Architecture
The Server & Client are ONE project in order to achieve an order of magnitude gain in productivity.
Making multiplayer games this way is fun & easy. Instead of MonoBehaviour, Mirror provides NetworkBehaviour components with:
- [Server] / [Client] tags for server-only / client-only code
- [Command] for Client->Server function calls (e.g. UseItem)
- [ClientRpc] / [TargetRpc] for Server->Client function calls (e.g. AddChatMessage)
- [SyncVar] / SyncList to automatically synchronize variables from Server->Client
Getting Started
Get Unity 2019 LTS, download Mirror on the Asset Store, open one of the examples & press Play!
Check out our Documentation to learn how it all works.
If you are migrating from UNET, then please check out our Migration Guide.
Made with Mirror
| Population: ONE | Zooba | SCP: Secret Laboratory | Naïca Online |
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| Laurum Online | SamuTale | Nimoyd | The Wall |
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| Nestables | A Glimpse of Luna | One More Night | Cubica |
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| Inferna | NightZ | Roze Blud | |
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And many more...
Mirror LTS (Long Term Support)
If you use Mirror in production, consider Mirror LTS!
- Bug fixes only.
- Consistent API: update any time, without any breaking features.
- Lives along side Unity 2019 LTS.
- Supported from Sept. 2021 to Sept 2022, depending on feedback.
Mirror V46 LTS is available to all GitHub Sponsors.
All sponsors are invited to the Mirror V46 LTS Repository automatically.
Low Level Transports
- (built in) KCP: reliable UDP
- (built in) Telepathy: TCP
- (built in) Websockets: Websockets
- Ignorance: ENET UDP
- LiteNetLib UDP
- FizzySteam: SteamNetwork
- FizzyFacepunch: SteamNetwork
- Epic Relay: Epic Online Services
- Bubble: Apple GameCenter
- Light Reflective Mirror: Self-Hosted Relay
- Oculus P2P: Oculus Platform Service
Benchmarks
- uMMORPG 480 CCU (worst case)
- Jesus' Benchmarks
Development & Contributing
Mirror is used in production by everything from small indie projects to million dollar funded games that will run for a decade or more.
Therefore it is important for us to follow the KISS principle in order for our games to survive, so that we can still fix networking bugs 10 years from now if needed.
Bug Bounty
A lot of projects use Mirror in production. If you found a critical bug / exploit in Mirror core, please reach out to us in private. Depending on the severity of the exploit, we offer $50 - $500 for now. Rewards based on Mirror's donations, capped at amount of donations we received that month.
Specifically we are looking for:
- Ways to crash a Mirror server
- Ways to exploit a Mirror server
- Ways to leave a Mirror server in undefined state
We are not looking for DOS/DDOS attacks. The exploit should be possible with just a couple of network packets, and it should be reproducible.
Credits / past findings / fixes:
- 2020, fholm: fuzzing ConnectMessage to stop further connects [#2397]