feat(websockets): subscribe to closed client connections via ServerEvent.closeClient

[JozefFlakus]

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: #160

What is the new behavior?

• @marblejs/websockets - check and kill incoming connections either via HTTP server upgrade event or WebSocket connection event
• @marblejs/websockets - subscribe to closed client connections via ServerEvent.closeClient ("close_client")
• @marblejs/websockets - additional status logging middleware for detecting closed client connections
• @marblejs/websockets - corrected predicates for noServer option
• @marblejs/websockets - deprecated connection$attribute in WebSocketServerConfig
• @marblejs/websockets - refactored integration tests (removed leaky "testbed")

const connection$: WsServerEffect = (event$) =>
  event$.pipe(
    matchEvent(ServerEvent.connection),
    map(event => event.payload),
    tap(({ client }) => {
      // check if connections should be closed
      client.close();
    }),
  );

const closeClient$: WsServerEffect = (event$) =>
  event$.pipe(
    matchEvent(ServerEvent.closeClient),
    map(event => event.payload),
    tap(({ client }) => {
      // react accordingly
    }),
  );

export const webSocketServer = createWebSocketServer({
  listener: webSocketListener({
    middlewares: [...],
    effects: [...],
  }),
  event$: combineEffects(
    connection$,
    closeClient$,
  ),
});

Does this PR introduce a breaking change?

[ ] Yes
[x] No

[codecov]

Codecov Report

Merging #252 into master will increase coverage by 0.29%.
The diff coverage is 96.66%.

@@            Coverage Diff             @@
##           master     #252      +/-   ##
==========================================
+ Coverage   95.07%   95.37%   +0.29%     
==========================================
  Files         147      147              
  Lines        2519     2527       +8     
  Branches      331      335       +4     
==========================================
+ Hits         2395     2410      +15     
+ Misses        120      113       -7     
  Partials        4        4              

Impacted Files	Coverage Δ
.../src/transport/strategies/redis.strategy.helper.ts	100.00% <ø> (ø)
...ebsockets/src/server/websocket.server.interface.ts	100.00% <ø> (ø)
...es/websockets/src/server/websocket.server.event.ts	80.76% <75.00%> (+8.04%)	⬆️
packages/websockets/src/server/websocket.server.ts	96.42% <93.33%> (+0.97%)	⬆️
packages/core/src/http/error/http.error.model.ts	66.66% <100.00%> (ø)
...ssaging/src/transport/strategies/redis.strategy.ts	97.18% <100.00%> (-2.82%)	⬇️
...es/websockets/src/+internal/websocket.test.util.ts	100.00% <100.00%> (ø)
packages/websockets/src/index.ts	100.00% <100.00%> (ø)
.../middlewares/websockets.statusLogger.middleware.ts	100.00% <100.00%> (+17.39%)	⬆️
... and 4 more

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