feat(event): implement cancel_event function with authorization check… #1019

[Awointa]

closes #1019

Summary

Adds cancel_event(env, caller, event_id) to the creator-event-manager
contract, allowing the event creator to irreversibly cancel an event before it
is finalized.

Changes

src/event.rs

• Added EventError::Unauthorized = 21 for non-creator callers.
• Implemented cancel_event — requires creator auth, rejects if already
  finalized or already cancelled, calls the existing Event::cancel() method,
  persists the updated event, and emits ("event", "cancelled").

src/lib.rs

• Wired cancel_event(env, caller, event_id) as a public contract entrypoint,
  mapping all error variants to panic strings consistent with the rest of the
  contract.

tests/cancel_event_tests.rs (new file)

• test_cancel_event_success — creator cancels; is_cancelled = true, is_active
  = false.
• test_cancel_event_non_creator_rejected — panics "unauthorized".
• test_cancel_event_already_cancelled — panics "event_cancelled" on second
  call.
• test_join_cancelled_event_rejected — panics "event_cancelled" on join_event.
• test_create_match_on_cancelled_event_rejected — panics "event_cancelled" on
  create_match.
• test_cancel_event_not_found — panics "event_not_found" for unknown ID.

Acceptance criteria

┌──────────────────────────────────┬──────────────────────────────────────┐
│ Criterion │ Covered by │
├──────────────────────────────────┼──────────────────────────────────────┤
│ Only creator can cancel │ test_cancel_event_non_creator_r │
│ │ ejected │
├──────────────────────────────────┼──────────────────────────────────────┤
│ Cancellation is irreversible │ test_cancel_event_already_cancelled │
├──────────────────────────────────┼──────────────────────────────────────┤
│ Cancelled events block │ test_join_cancelled_event_rejected │
│ join_event │ │
├──────────────────────────────────┼──────────────────────────────────────┤
│ Cancelled events block │ test_create_match_on_cancelled_ │
│ create_match │ event_rejected │
├──────────────────────────────────┼──────────────────────────────────────┤
│ ("event", "cancelled") emitted │ cancel_event impl │
│ on success │ │
└──────────────────────────────────┴──────────────────────────────────────┘

Notes

AlreadyFinalized (error code 18) was already present in EventError — no new
variant needed for that case. The Unauthorized variant (21) is the only
addition to the error enum.

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Project	Deployment	Actions	Updated (UTC)
insight-arena-4rll	Ready	Preview, Comment	Jun 23, 2026 2:59pm

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