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{ delayUntil } from '../delay-until/index';\nimport { PollingMeasure } from './polling-measure';\n\nexport interface PollingObserverOptions {\n timeout?: number;\n interval?: number;\n}\ntype PollingCallback<T> = () => T | Promise<T>;\ntype ConditionCallback<T> = (\n data: T | null | undefined,\n records: PollingObserver<T>['_records'],\n object: PollingObserver<T>\n) => boolean | Promise<boolean>;\n\nexport interface OnfinishFulfilled<T> {\n status: 'finish' | 'timeout';\n value: T | null | undefined;\n}\nexport interface OnfinishRejected {\n readonly status: 'error';\n reason: Error;\n}\nexport type OnfinishValue<T> = OnfinishFulfilled<T> | OnfinishRejected;\ntype OnfinishCallback<T> = (\n value: OnfinishValue<T>,\n records: PollingObserver<T>['_records'],\n object: PollingObserver<T>\n) => unknown;\n\nfunction isPromise<T>(r: T | Promise<T>): r is Promise<T> {\n return 'function' === typeof((r as Promise<T>).then);\n}\n\nconst perf = globalThis.performance;\n\nexport class PollingObserver<T> {\n public onfinish?: OnfinishCallback<T>;\n\n private _forceStop = false;\n private _records: PollingMeasure[] = [];\n private _isPolling = false;\n\n constructor(public conditionCallback: ConditionCallback<T>) {\n if ('function' !== typeof(conditionCallback)) {\n throw new TypeError(`'conditionCallback' is not defined`);\n }\n }\n\n public disconnect(): void {\n this._forceStop = true;\n\n if (!this._isPolling) this._records = [];\n }\n\n public async observe(\n callback: PollingCallback<T>,\n options?: PollingObserverOptions\n ): Promise<void> {\n /**\n * NOTE(motss): To ensure `this._forceStop` is always reset before start observing.\n */\n this._forceStop = false;\n\n const { interval, timeout }: PollingObserverOptions = options || {};\n const isValidInterval = 'number' === typeof(interval) && interval > 0;\n const obsTimeout = 'number' === typeof(timeout) ? +timeout : -1;\n const obsInterval = isValidInterval ? +(interval as number) : 100;\n\n const isInfinitePolling = obsTimeout < 1;\n const records = this._records;\n const onfinishCallback = this.onfinish;\n const conditionCallback = this.conditionCallback;\n const loop = true;\n\n let totalTime = 0;\n let value: T | null | undefined = void 0;\n let i = 0;\n let status: OnfinishFulfilled<T>['status'] = 'finish';\n let result: OnfinishValue<T> = {} as OnfinishValue<T>;\n\n try {\n polling: while (loop) {\n if (this._forceStop) break polling;\n\n /** NOTE(motss): Set to indicate polling initiates */\n this._isPolling = true;\n\n const conditionResult = conditionCallback(value, records, this);\n const didConditionMeet = isPromise(conditionResult) ?\n await conditionResult : conditionResult;\n const didTimeout = isInfinitePolling ? false : totalTime >= obsTimeout;\n\n if (didTimeout || didConditionMeet) {\n status = didTimeout ? 'timeout' : status;\n break polling;\n }\n\n const startAt = perf.now();\n const r = callback();\n value = isPromise(r) ? await r : r;\n const endAt = perf.now();\n const duration = endAt - startAt;\n const timeLeft = isValidInterval ? obsInterval - duration : 0;\n\n records.push(new PollingMeasure(`polling:${i}`, duration, startAt));\n\n totalTime += (duration > obsInterval ? duration : obsInterval);\n i += 1;\n\n if (timeLeft > 0) await delayUntil(timeLeft);\n }\n\n result = { status, value };\n } catch (e) {\n result = { status: 'error', reason: e as Error };\n } finally {\n const recordsSlice = records.slice();\n\n if (this._forceStop) this._records = [];\n\n /** NOTE(motss): Reset flags */\n this._isPolling = this._forceStop = false;\n\n if ('function' === typeof(onfinishCallback)) {\n onfinishCallback(result, recordsSlice, this);\n }\n }\n }\n\n public takeRecords(): PollingMeasure[] {\n return this._records;\n }\n}\n"]} |