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feat(kit): the event contract, taught and built (chapter 5)
The fifth chapter, and the template code it teaches out of. Events is the first
thing in the book that goes the other way — chapters 1-4 move data out of the
game and onto a page; an event changes a live world on a schedule, unattended.
**Chapter 5** covers the four declarations (budgets, option sources, leases,
actions), leads with the lease because EVENTS.md §H is right that it is the
primitive that travels and the spawn is the special case, and gives one section
each to the four things that are invisible until an outage: the envelope's
failure default, the idempotency passthrough, recording a resource before
confirming it, and under-declaring `cost`.
**Chapters 3 and 4 gain one section each** for the command plane, because
without them chapter 5 teaches a module to send an idempotency key to a sidecar
the book never told anyone to build a command path in. Both say at the top that
they are skippable until you want chapter 5.
**The template ships one of each declaration**, with `server/sidecarClient.js`
as the near end — a real timeout, a real key passthrough, a simulated transport
in one function marked for replacement. That file is named for the filename
`noGameConnection.test.js` already anticipated, so the test stays green now and
fires correctly the moment `deliver()` becomes a request.
Two things writing it found, both now in the chapter and beside the code:
* **An idempotency key belongs on a command, never on a question.** The first
draft keyed every call including the reads; an at-most-once store then
answers every future read with the first one's reply, forever. The lease
applied correctly and the module could no longer see it. Hence `ask` and
`send` as two functions.
* **A refusal's reason goes in `error`; core reads no other name.** The first
draft used `detail`, on the strength of the one place EVENTS.md §H mentions
it, and every refusal it produced was anonymous on the run console.
Proved by running the template's real declarations through core's real registry
at `edge` (all four accepted) and its real envelopes through the real
`events/dispatch.js` classifier.
**CI is RED on `checkCoreApi` and that is the mechanism working.** The template
now declares `coreApi: ^1.10.0` and `ci/core-ref.json` pins the engagement
cutover, where `main` is still 1.9.0. Equality is the check, a bump is meant to
turn this repo red until someone re-reads the chapters, and the pin move rides
in the events cutover (EVENTS_PLAN.md P16) as its own commit. Do not "fix" it.
Refs EVENTS_PLAN.md Phase 15, EVENTS.md §F, MODULE_API.md 1.10.0.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016wDDVXWMDz82WqE1i969r4
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| a8fa524263 |
feat(kit): the engagement contract, taught and built (cutover 5 of 7)
The kit was pinned to website 963d734 -- MODULE_API 1.6.0, the Teams cutover --
and the platform is on 1.9.0. Three registrations and two calls arrived in
between, and a reader building against this book would have found no mention of
any of them: a module can now declare what its game can announce, and never who
is told.
Moving `ci/core-ref.json` is the mechanism for exactly this. The pin is now
66bb3b9a (website `main`, the engagement cutover) and `template/module.json`
declares `^1.9.0`.
What chapter 2 gained, under "Telling core something happened":
* a TRIGGER is a payload contract, not a notification stream -- the two share
one id namespace and are constantly confused;
* `ceiling` is required, has no default, and is a CONTAINMENT tree rather than
a size ladder (a `staff` ceiling does not permit `owner`);
* an AUDIENCE resolver returns user ids and nothing else, resolves to NOBODY
on failure, and takes CONSTANT params -- the constraint worth knowing before
you design around it;
* templates re-ensure per seedVersion, rule groups are offered ONCE per group
key, so a rule appended to an existing group reaches fresh installs only;
* `ctx.events.emit` binds the owner and is fire-and-forget; `ctx.inbox.push`
is the direct write, for when there is nothing for an operator to decide.
The template builds all of it: one trigger, one audience over the clan roster it
already had, one seeded body and one seeded rule group, and an emitter in
`boot.js` that fires on the TRANSITION rather than on the poll. Seven new tests,
including the audience that resolves to nobody when its query throws.
Three claims were wrong and are corrected here rather than shipped:
* core validates `subjectKey` against the declared variables and refuses the
module; the draft taught a cooldown keyed on `undefined`, which the check
exists to prevent and a reader will never see.
* `emit` throws OUTSIDE production and only drops-and-logs inside it. Teaching
the second half alone leaves a developer meeting a throw the book says
cannot happen.
* the seeded body itself was malformed -- heading `level: 2` where the block
registry takes 'h2', and no block ids at all.
The third is the one worth keeping: `registerEngagementSeeds` checks that
`blocks` is a non-empty array and stops, so that body would have registered,
seeded, and failed the first time an operator opened it. Found by running the
template's `register()` through core's real registry at the pinned ref -- which
CI does not do, and cannot: the template job checks the version and runs the
template against fakes. A fake accepts what core refuses. The gap is now named
in the chapter, beside the code, and in the pin's own comment, and the rule that
bit has a test that fails on it.
Also: `checkLinks` skipped `.core/`. Bumping this pin means cloning core into
that directory first, and the walk then reported nine broken links in someone
else's README. CI never saw it -- the clone happens in the `template` job and
the check runs in `prose` -- so it was a failure only a person could meet.
Co-Authored-By: Claude <noreply@anthropic.com>
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| 1ed617736e |
feat(template): a module that builds and loads — Phase 5 slice 1
The kit's `template/`: a complete, minimal Runic Gateway module a reader copies,
renames, and runs before reading a chapter. Slice 0 landed the workflow that runs
it; this is the tree that workflow was written against, so the `template` job
arms itself with no edit to the guard.
Installed into a real core it adds one public page at `/examplegame/status`, a nav
row pointing at it, one API route described in an OpenAPI fragment core merges,
one table created by an idempotent schema fragment and dropped by a purge file,
and both lifecycle hooks. That is deliberately less than a real module does; what
it is complete about is the shape — every seam used once, with the reasoning next
to it.
Four decisions, settled with the org lead:
1. **Public tier only, plus the lifecycle hooks.** §2.11.1 d1's "one public route",
plus enough to show the whole vertical seam once. Admin and player tiers become
worked examples quoted from module-uo in chapter 2 rather than two thirds of a
tree the reader deletes on day one.
2. **The release workflow ships as a file, in BOTH flavours** — `.gitea/` and
`.github/`. Neither runs where it sits (a workflow is only read from a
repository root) and each arms itself when the reader's copy is its own repo.
Packaging is the part of a module that cannot be guessed at, and the kit's
audience is outside this org, so assuming Gitea would have been assuming our
own deployment. Core installs from a URL and does not care where the release
lives — only that the host is on the operator's `MODULE_SOURCE_HOSTS`.
3. **A rename checklist that CI verifies**, not a rename script. `template/README.md`
carries the table; `scripts/checkRenameSites.js` holds it against the tree in
both directions — an unlisted file that still carries the placeholder fails, and
so does a listed file that no longer does. The second half is the one usually
left out and the more valuable: a row that has stopped matching reads as
instructions to edit something that is not there. Same rule core's identifier
check follows about its own exemptions. It has its own ten-test suite, run by
CI as `node --test`, because a check that has never been shown to fail is a
check nobody knows the state of.
4. **A neutral invented game.** One deviation from the literal answer, forced by
decision 3: the id is `examplegame`, not `example`. The checklist check is a
text search, and `example` occurs in ordinary English ("for example") all over
prose that is not a rename site — a placeholder that cannot occur by accident is
what makes the check answerable instead of a source of false alarms someone
learns to ignore.
**The pin moves to the 1.4.0 bump** (website `edge` 1b692bf), which is what
`template/module.json` declares as `coreApi`. Slice 0 pinned its parent, before
1.4.0 existed, so `checkCoreApi.js` arms for the first time here — it asserts
EQUALITY, and its failing on the next contract bump is the system working.
Also in CI: the client tests now run AFTER the build (two of them read the built
chunk and skip without one — run first, the job reports green while asking nothing
about the artifact that ships), and `check:swagger` verifies the committed
fragment is current.
## The finding: an UPDATE that changes nothing does not touch ON UPDATE CURRENT_TIMESTAMP
Every suite passed, both guards passed, the chunk built, the module loaded into a
real core and the page rendered correctly. Two hours later the same page said the
world was offline, and it was wrong.
`updated_at` was declared `ON UPDATE CURRENT_TIMESTAMP`, and MariaDB fires that
only when an UPDATE actually CHANGES a value. The boot refresh writes the same
numbers every thirty seconds — which is exactly what a quiet game looks like — so
the timestamp froze at the first write, the row crossed the freshness window, and
the model correctly reported a stale row as offline. Verified against the live
database: two hours of refreshes, `updated_at` still the boot timestamp.
No test in this repo could see it. The model takes its clock as an argument, and
nothing in a suite runs the same UPDATE twice against a real database. It is only
visible as a page that was right when you looked at it and wrong an hour later.
The writer now sets `updated_at = CURRENT_TIMESTAMP` explicitly and the column
drops the clause that was not doing what it looked like it was doing; both carry
the reasoning. Re-verified end to end: the timestamp advances every interval and
the API reports fresh.
Falling out of the fix, the schema fragment gained the rule the reader hits next:
**changing a table is an ALTER, never an edit to its CREATE** — `CREATE TABLE IF
NOT EXISTS` does nothing when the table exists, so an edited column definition
takes effect on a fresh install and on no existing one, which is the worst
possible split because your development database is usually the fresh one.
## Verified
- 29 server tests, 18 client tests, 10 kit-script tests; `check:imports`,
`check:externals`, `check:swagger` and `checkCoreApi` all green, run in CI's own
order from a clean `npm ci`.
- Browser smoke (MODULE_API.md §7.7) against a real core built from the pinned
ref: module `started`, published on `/api/v1/public/modules`, chunk served
`no-cache` with the right MIME from the entry's directory while `module.json`
and the server source 404, script tag injected after core's bundle, the page
rendering inside core's own chrome, the nav row interleaved into the public
header between Wiki and About, SPA navigation into it from another page, the
module's path and schema and tag merged into `/api/docs.json`, and
`[examplegame] registered against core API 1.4.0` in the console with no CSP
report and no React error.
Refs: MODULE_SYSTEM.md §2.11.1 (slice 1), MODULE_API.md §2.x, §3.x, §5.1, §7.7.
Co-Authored-By: Claude <noreply@anthropic.com>
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