fix: throttle PROVIDERSTATUS server events - #2974
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setPluginStatus/setProviderStatus emitted the full provider status list on every call. A plugin calling it in a loop pushes megabytes per second into every admin-UI WebSocket; the socket buffers grow until the connection is cut and the Data Browser's own subscription data queues behind the backlog (SignalK#2972: 196 MB on one socket, ~2.4 MB/s). Coalesce calls into at most one PROVIDERSTATUS emit per second, trailing edge, so the admin UI still sees the latest status promptly while a chatty caller can no longer flood the socket. The 5-second periodic full refresh is unchanged.
📝 WalkthroughWalkthroughProvider-status events now pass through a throttling emitter. Burst updates are coalesced, status is refreshed every five seconds, immediate emissions remain available, and pending emissions are canceled during shutdown. ChangesProvider status event lifecycle
Priority: ➖ Normal — Impact reflects medium issue severity. Estimated code review effort: 3 (Moderate) | ~20 minutes Severity of issue fixed: Medium Merge Risk: 🔵 Low · up to Provider-status updates are now coalesced to reduce WebSocket traffic while retaining immediate and trailing updates. The implementation has focused coverage, but the end-to-end count assertion should be corrected to reliably validate both burst emissions before merge. Sequence Diagram(s)sequenceDiagram
participant Server
participant ProviderStatusEmitter
participant PROVIDERSTATUS listeners
Server->>ProviderStatusEmitter: request() after provider-status update
ProviderStatusEmitter->>PROVIDERSTATUS listeners: emit coalesced status
Server->>ProviderStatusEmitter: emitNow() every five seconds
Server->>ProviderStatusEmitter: cancel() during shutdown
Possibly related PRs
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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| export const PROVIDER_STATUS_MIN_INTERVAL_MS = 1000 | ||
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| export class ProviderStatusEmitter { |
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this is not a ProviderStatusEmitter - it does not emit provider statuses, but is used to emit them. to me it is ThrottledCaller - it calls the given function but throttles the calls as described. imho naming should reflect that and min interval come from callee.
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Sorry, missed this one. Will have a look today. |
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Actionable comments posted: 4
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Inline comments:
In `@src/throttledCaller.ts`:
- Line 23: Update the throttling logic around callNow and this.timer so a zero
wait invokes callNow synchronously, while only positive waits schedule a timer.
Preserve the existing delayed behavior for positive intervals, and add a unit
assertion that the first request increments the call count before request
returns.
In `@test/providerstatus-throttle-e2e.ts`:
- Line 23: Replace the timing literals in the test with descriptive named
constants for the server lifecycle timeout, test timeout, and bootstrap-drain
delay, then reuse those constants in this.timeout and the related timing calls.
Apply the change consistently to all referenced occurrences while preserving
their current values and behavior.
- Line 63: Update the emission-count assertion in the provider-status throttle
test to enforce the calculated maximum of three messages for the two-second
window, replacing the current less-than-ten bound while preserving the existing
emitted collection and test flow.
- Around line 17-18: Replace the any-based server declaration and related
untyped helper usage in the provider-status test with typed interfaces or
declarations at the test utility boundary. Type startServerP, getAdminToken, and
WsPromiser, ensure server.app.setPluginStatus and PROVIDERSTATUS filters use the
declared server and payload types, and narrow parsedMessages() results from
unknown before accessing event fields.
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src/index.tssrc/throttledCaller.tstest/providerstatus-throttle-e2e.tstest/throttledCaller.ts
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The class never referenced provider status: it holds a callback, a timer and a timestamp. Name it for what it does and let the caller own the policy, so both provider-status intervals sit together in index.ts.
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Inline comments:
In `@test/providerstatus-throttle-e2e.ts`:
- Line 88: Update the latest-status test to use a distinct plugin ID from the
preceding test in both the setPluginStatus call and its message filter, ensuring
bootstrap messages for throttle-e2e-plugin cannot satisfy the final assertion.
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Inline comments:
In `@test/providerstatus-throttle-e2e.ts`:
- Line 15: Update the comment near the server startup logic to reference the
defined SERVER_START_TIMEOUT_MS constant, or remove the stale constant reference
if it is unnecessary.
- Line 74: Update the assertion on emitted in the throttling test to require at
least two messages, ensuring both the immediate and trailing burst emissions are
produced.
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The unit test exercises ThrottledCaller in isolation, so a miswiring of the two provider status intervals would not fail it. Drive a real server through setPluginStatus and count what reaches an admin socket: 201 messages unthrottled against at most three with the throttle in place.
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Inline comments:
In `@test/providerstatus-throttle-e2e.ts`:
- Line 27: Update the MAX_EMITS bound and related assertions in the provider
status throttle test to account for both immediate and trailing burst emissions
plus the possible periodic refresh. Require at least two emissions so the
trailing coalesced status is verified, while preserving the existing
periodic-refresh allowance.
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setPluginStatus/setProviderStatusemit aPROVIDERSTATUSserver event carrying the full provider status list on every call. A plugin that calls it in a loop turns that into a continuous stream on every admin-UI WebSocket — in #2972 ~2.4 MB/s, 196 MB queued on one socket before the overflow cut it — and everything else on that socket, including the Data Browser's own subscription data, waits behind the backlog.This coalesces status changes into at most one
PROVIDERSTATUSemit per second — the first change goes out immediately, further changes within the second fold into one emit when it expires — so a chatty caller is bounded at ~8 KB/s per client while the admin UI still shows the latest status within a second. The 5-second periodic full refresh is unchanged; a pending emit is cancelled onstop().Fixes #2972
Tested
npm run format,npm run build:all,npm test(server suite 1236 passing, workspaces green, ci-lint clean)test/providerStatusEmitter.ts: a burst of 1000 requests → one prompt emit and one more when the interval expires, prompt emit after a quiet interval,emitNowandcanceldrop a pending requestSummary
This PR throttles
PROVIDERSTATUSevents fromsetPluginStatusandsetProviderStatus.stop().ThrottledCallerlogic and tests.This reduces WebSocket congestion that can delay Data Browser updates reported in issue
#2972.