The transport was a hand-rolled setupWebSocket(server) that index.ts kicked
off with a dynamic import after listen(). It is a @WebSocketGateway now, with
DatabaseService and EphemeralTokenService injected instead of imported, and
the heartbeat owned by a lifecycle hook rather than an interval nobody stops.
The wire protocol does not move. Nest's WsAdapter dispatches on
{ event, data } and every deployed client sends { type, tripId }, so
TrekWsAdapter translates rather than asking clients to change. It also builds
the ws server itself instead of delegating: the base's port-0 branch uses
noServer and performs the upgrade from its own registry, which never consults
verifyClient, so delegating would have dropped the origin check and answered
101 to anyone. The per-socket error listener stays attached first, because an
unhandled one kills the process (#1576), and the flood guard counts every
inbound frame before parsing, because malformed frames are exactly the ones
worth limiting.
Four things had to stay where they were, and each is a silent failure if it
does not:
The socket registry stays module state. Seventeen bridges and
notifications.instance build `new RealtimeService()` outside the container;
rooms on a provider instance would leave their broadcasts going to an empty
map, with no error and no log.
The socket id stays a monotonic integer. The client echoes it as X-Socket-Id
and broadcast excludes the originator with Number(excludeSid). A uuid is NaN,
NaN === NaN is false, and every client would receive its own writes back,
which shows up as drag-and-drop that jumps rather than as an error.
buildApp creates the http server and binds the adapter before app.init(), and
callers take it from getHttpServer(). Nest binds gateways during init, so a
later adapter binds nothing; an adapter given the app binds to Nest's own
internal server, which this process never listens on. Both boot green with no
client able to connect.
RealtimeGatewayModule is imported by AppModule alone. RealtimeModule is
@Global, so a gateway there follows into every hand-assembled TestingModule,
and Nest's SocketModule then loads an adapter none of them set: it reaches for
@nestjs/platform-socket.io and calls process.exit(1). Eighteen e2e harnesses
died that way before the split.
src/websocket.ts survives as a re-export of the three fan-out primitives. 115
test files vi.mock that path to assert on broadcasts.
The two transport suites pass unchanged, and 30 new cases pin the pieces
directly: the pv and MFA gates, the numeric socket id, the plugin announcement
firing before the room check, both sides of the origin allowlist, and the
flood guard counting frames no handler wants.
Two small leftovers, moved to the domains that own them.
ephemeralTokens holds the short-lived tokens the WebSocket handshake and the
file-download links use. It already had startTokenCleanup/stopTokenCleanup with
an unref-ed handle — the right shape. What was missing is anyone calling stop:
index.ts kicked the sweep off with a bare require() after listen() and nothing
ever ended it. AuthService owns that lifecycle now, through
onModuleInit/onModuleDestroy, which is where it belongs — it is the service that
issues the tokens.
The store itself stays module state. websocket.ts consumes tokens from outside
the container, and a token store is only useful if the issuer and the consumer
share one. Same reasoning as the weather cache in #1835.
inAppNotificationActions is a 22-line handler registry with exactly one
consumer; it moves next to it as notifications/in-app-actions.ts.
services/ is down to 9 files, from 44.
* chore(nest): register LlmParseModule in AppModule
The module was only in the container because BookingImportModule and
PluginsModule happen to import it, so /api/admin/llm/local depended on those two
keeping that import. Register it where every other module is registered.
* refactor(nest): give the rate limiter one home and one instance
RateLimitService keeps its counters in a Map on the instance, but it was listed
in the providers of auth, oauth, transit and trip-invite, so each of them got its
own. Nothing is broken today — the bucket names in use (login/mfa/forgot/reset,
oauth_*, transit_*, trip_invite) don't overlap — but two modules picking the same
name would have quietly allowed twice the configured attempts.
Move it to nest/common, where it belongs now that four domains use it, and hand
it out through a small module they import. Not @Global: the e2e suites build a
container around one domain module, so a global AppModule never pulled in isn't
there at all.
transit.mcp.ts keeps its own instance on purpose — it keys by userId under
mcp_transit_* while the REST path keys by IP.
* test(ws): pin the wire envelope before touching the transport
Every frame on the socket is flat: {type, tripId, ...payload} out, {type, tripId}
in. Nest's WsAdapter dispatches on message.event and answers {event, data}, so
moving this onto a gateway without a custom serialiser would leave join silently
unhandled — no welcome.socketId to send back as X-Socket-Id, and every client
would then receive its own writes.
Nothing catches that today: the 100+ tests that touch realtime mock src/websocket
and never look at the bytes. WS-032 sends the exact shape the stock adapter would
and asserts the server ignores it.
* docs(nest): drop the parts of the README that no longer exist
strangler.ts, DEFAULT_NEST_PREFIXES/NEST_PREFIXES and tests/parity/ are all gone —
every request goes through Nest now — but the README still walks a new contributor
through adding a prefix and writing a parity test against the Express route.
Also spell out that the 80% gate is an average over src/nest/**, not a floor per
file, so a large untested module can sit behind the well-covered small ones.
Maurice