ludic/docs/language/networking/fn-is_server.md
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 17:53:22 +03:00

1.2 KiB

id name category kind tokens sig tip order
fn-is_server is_server networking builtin is_server is_server() -> bool Whether this peer is the authority. 50

is_server returns whether the local peer is currently acting as the authority. The networking runtime sets the peer's role register (via set_role); offline it defaults to server, so an un-networked build reports true and every role guard collapses to "run here." This is the low-level read behind the @Server handler annotation — and in ordinary gameplay code you should reach for the annotation instead, since scattering is_server() branches through your simulation is exactly the readability footgun the role annotations exist to remove. Use the raw check only when you are driving the loop yourself.

program AuthorityGate {
  property Score { total: int = 0 }
  model Scoreboard { Score }

  @Server handler AwardPoints phase Update {
    for (Score) in query [Score] { Score.total = Score.total + 10 }
  }

  entry {
    spawn Scoreboard { Score { total: 0 } }
    if is_server() { print(1) } else { print(0) }   # 1 offline — defaults to authority
  }
}