a closed, named list of events — `files:uploaded`, `archive:extracted`,
`files:placed` — each carrying absolute paths and an owner. NOT an event bus in the
open sense: `emit(anyString, anything)` becomes an API nobody can change, because
the moment a plugin listens for a string that string is a contract with no list
saying so. a union means adding one is a deliberate edit and removing one fails to
compile.
TWO GUARANTEES, AND THEY ARE THE WHOLE DESIGN. emit never blocks: it schedules and
returns, so an upload does not wait for a subscriber thumbnailing a HEIC. and a
subscriber cannot fail the operation that triggered it — the upload is written and
answered before anybody is told, so a plugin that is down, slow or throwing gets a
line in the log. tested both ways, sync and async, plus that one failing listener
does not stop the next.
PLUGINS SUBSCRIBE THROUGH THE MANIFEST, same shape as `fileTypes`: `hooks: {
'files:uploaded': '/v1/on-upload' }`. resolved at EMIT time rather than at boot,
because plugins are installed, updated and disabled while the server runs and a
registration made at startup describes a machine that has since changed. nothing
here names a plugin.
CORE IS THE FIRST SUBSCRIBER, and that is deliberate rather than a shortcut. the
thumbnail cache belongs to the platform — its key, its route — so a plugin doing
this work would produce files the browser never looks at. the warmer calls the same
`buildThumbnail` the request path calls, which means HEIC still warms through
av-club via the fileTypes claim, without this file knowing that plugin exists.
AND A SINGLE-FLIGHT MAP, which the warmer made necessary. two callers now want the
same thumbnail as a matter of course: the warmer starts on upload and the browser
asks a moment later. measured before the fix — four concurrent requests plus the
warmer each decoded the same 4032x3024 HEIC and took a slot from a limit of four,
which is a warmer competing with the person waiting rather than helping them. after:
all five share one build, 5.5s once, then 130ms.
verified end to end: upload returns in 56ms, four concurrent requests all 200 in a
single 5.5s build, cached 130ms. 1679 tests, docs:check green.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Officer-Session: 656f5c85-e49a-4f1f-b9f3-042a04b4d043
