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feat(web-analytics): Add concurrency controller code to plugin server (…
…#27058) Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| import FastPriorityQueue from 'fastpriorityqueue' | ||
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|
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| export function promiseResolveReject<T>(): { | ||
| resolve: (value: T) => void | ||
| reject: (reason?: any) => void | ||
| promise: Promise<T> | ||
| } { | ||
| let resolve: (value: T) => void | ||
| let reject: (reason?: any) => void | ||
| const promise = new Promise<T>((innerResolve, innerReject) => { | ||
| resolve = innerResolve | ||
| reject = innerReject | ||
| }) | ||
| return { resolve: resolve!, reject: reject!, promise } | ||
| } | ||
|
|
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| // Note that this file also exists in the frontend code, please keep them in sync as the tests only exist in the other version | ||
| class ConcurrencyControllerItem<T> { | ||
| _debugTag?: string | ||
| _runFn: () => Promise<void> | ||
| _priority: number = Infinity | ||
| _promise: Promise<T> | ||
| constructor( | ||
| concurrencyController: ConcurrencyController, | ||
| userFn: () => Promise<T>, | ||
| abortController: AbortController | undefined, | ||
| priority: number = Infinity, | ||
| debugTag: string | undefined | ||
| ) { | ||
| this._debugTag = debugTag | ||
| this._priority = priority | ||
| const { promise, resolve, reject } = promiseResolveReject<T>() | ||
| this._promise = promise | ||
| this._runFn = async () => { | ||
| if (abortController?.signal.aborted) { | ||
| reject(new FakeAbortError(abortController.signal.reason || 'AbortError')) | ||
| return | ||
| } | ||
| if (concurrencyController._current.length >= concurrencyController._concurrencyLimit) { | ||
| throw new Error('Developer Error: ConcurrencyControllerItem: _runFn called while already running') | ||
| } | ||
| try { | ||
| concurrencyController._current.push(this) | ||
| const result = await userFn() | ||
| resolve(result) | ||
| } catch (error) { | ||
| reject(error) | ||
| } | ||
| } | ||
| abortController?.signal.addEventListener('abort', () => { | ||
| reject(new FakeAbortError(abortController.signal.reason || 'AbortError')) | ||
| }) | ||
| promise | ||
| .catch(() => { | ||
| // ignore | ||
| }) | ||
| .finally(() => { | ||
| if (concurrencyController._current.includes(this)) { | ||
| concurrencyController._current = concurrencyController._current.filter((item) => item !== this) | ||
| concurrencyController._runNext() | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
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| export class ConcurrencyController { | ||
| _concurrencyLimit: number | ||
|
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| _current: ConcurrencyControllerItem<any>[] = [] | ||
| private _queue: FastPriorityQueue<ConcurrencyControllerItem<any>> = new FastPriorityQueue( | ||
| (a, b) => a._priority < b._priority | ||
| ) | ||
|
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| constructor(concurrencyLimit: number) { | ||
| this._concurrencyLimit = concurrencyLimit | ||
| } | ||
|
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| /** | ||
| * Run a function with a mutex. If the mutex is already running, the function will be queued and run when the mutex | ||
| * is available. | ||
| * @param fn The function to run | ||
| * @param priority The priority of the function. Lower numbers will be run first. Defaults to Infinity. | ||
| * @param abortController An AbortController that, if aborted, will reject the promise and immediately start the next item in the queue. | ||
| * @param debugTag | ||
| */ | ||
| run = <T>({ | ||
| fn, | ||
| priority, | ||
| abortController, | ||
| debugTag, | ||
| }: { | ||
| fn: () => Promise<T> | ||
| priority?: number | ||
| abortController?: AbortController | ||
| debugTag?: string | ||
| }): Promise<T> => { | ||
| const item = new ConcurrencyControllerItem(this, fn, abortController, priority, debugTag) | ||
|
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| this._queue.add(item) | ||
|
|
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| this._tryRunNext() | ||
|
|
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| return item._promise | ||
| } | ||
|
|
||
| _runNext(): void { | ||
| const next = this._queue.poll() | ||
| if (next) { | ||
| next._runFn() | ||
| .catch(() => { | ||
| // ignore | ||
| }) | ||
| .finally(() => { | ||
| this._tryRunNext() | ||
| }) | ||
| } | ||
| } | ||
|
|
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| _tryRunNext(): void { | ||
| if (this._current.length < this._concurrencyLimit) { | ||
| this._runNext() | ||
| } | ||
| } | ||
|
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| setConcurrencyLimit = (limit: number): void => { | ||
| this._concurrencyLimit = limit | ||
| } | ||
| } | ||
|
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| // Create a fake AbortError that allows us to use e.name === 'AbortError' to check if an error is an AbortError | ||
| class FakeAbortError extends Error { | ||
| name = 'AbortError' | ||
| } |