ludic/docs/language/annotations/annot-toserver.md
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docs(api): per-symbol pages, fuzzy search, deep token linking, hover cards
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 17:53:22 +03:00

1.5 KiB


id: annot-toserver name: @ToServer category: annotations kind: annotation tokens: @ToServer sig: @ToServer event Name { … } tip: A remote event sent from a client to the server — a client→server request. order: 50

@ToServer marks an event as a directional remote event that travels from a client up to the authority — an RPC, expressed as the ordinary event bus with a direction flag rather than a new concept. At an emit site the event's POD payload is serialized as an event id followed by its packed fields and sent through the transport seam toward the server; it does not run locally. On the far side, draining the transport (the runtime's pump) re-emits it into the normal @On dispatch, so a @Server @On(Name) handler picks it up. Use it for player intent — a move request, a fire command — that the authority must validate before it affects the world. Its mirror is @ToClients, which broadcasts the other way.

program FireRequest {
  property AmmoLog { shots_fired: int = 0 }
  model Turret { AmmoLog }

  @ToServer event Fire { direction: int = 0 }        # client -> server request

  @Server @On(Fire) handler HandleFire {             # authority validates and applies
    for (AmmoLog) in query [AmmoLog, {Turret}] {
      AmmoLog.shots_fired = AmmoLog.shots_fired + direction
    }
  }

  entry {
    spawn Turret { AmmoLog { shots_fired: 0 } }
    emit Fire(direction: 1)                           # serialized onto the wire, not run locally
  }
}