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@aimee-blue/ab-service-kit

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Aimee Blue Service Template

github.com/Aimee-Blue/ab-service-kit

Aimee-Blue/ab-service-kit

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{ Observable, Subject } from 'rxjs';\nimport { ignoreElements, tap, filter, scan, map } from 'rxjs/operators';\nimport { EOL } from 'os';\nimport { TagNotification, executeOnNotifications } from '../notifications';\nimport {\n Logger,\n defaultLogger,\n logEvents,\n BasicLogger,\n defaultBasicLogger,\n LogOn,\n} from '../logging';\n\ntype Timestamp = [number, number];\n\ninterface IDetails {\n [key: string]: string | number | boolean;\n}\n\ninterface ITagState {\n hitTime?: Timestamp;\n}\n\nfunction timestampToTime(timestamp: Timestamp, since?: Timestamp) {\n if (since) {\n const time = process.hrtime(since);\n return time[0] * 1e3 + time[1] / 1e6;\n } else {\n return timestamp[0] * 1e3 + timestamp[1] / 1e6;\n }\n}\n\nconst allHits = new Subject<{ name: string; timestamp: Timestamp }>();\n\nconst allMemos = new Subject<{\n name: string;\n time: number;\n details?: IDetails;\n}>();\n\nconst allSummaries = new Subject<{ name: string; summary: ISummary }>();\n\nconst defaultDeps = {\n timestamp: () => process.hrtime(),\n timestampDiff: (timestamp: Timestamp) => process.hrtime(timestamp),\n};\n\nfunction createInitialState(deps = defaultDeps): IState {\n const stateByTag = new Map<string, ITagState>();\n\n const createStateForTag = (): ITagState => {\n return {};\n };\n\n const self = Object.freeze({\n hit: (name: string) => {\n const state = stateByTag.get(name) || createStateForTag();\n\n state.hitTime = deps.timestamp();\n allHits.next({\n name,\n timestamp: state.hitTime,\n });\n\n stateByTag.set(name, state);\n },\n memo: (\n name: string,\n details?: IDetails,\n determine: (metric: number) => number = (value) => value\n ): number | null => {\n const state = stateByTag.get(name);\n if (!state || !state.hitTime) {\n return null;\n }\n\n const timeSinceHit = determine(\n timestampToTime(deps.timestampDiff(state.hitTime))\n );\n\n allMemos.next({\n name,\n time: timeSinceHit,\n ...(details && {\n details,\n }),\n });\n\n stateByTag.set(name, state);\n\n return timeSinceHit;\n },\n });\n return self;\n}\n\nfunction isMatch(name: string, to: string | RegExp) {\n return (\n (typeof to === 'string' && to === name) ||\n (typeof to === 'object' && to.test(name))\n );\n}\n\nfunction createSummary(name: string | RegExp): Observable<ISummary> {\n const MAX_MEMOS = 100;\n\n return allMemos.asObservable().pipe(\n //\n filter((item) => isMatch(item.name, name)),\n scan(\n (acc, item) => {\n const memos = [...acc.memos, item.time].slice(-MAX_MEMOS);\n const sortedMemos = [...memos];\n sortedMemos.sort();\n return {\n ...acc,\n memos,\n sortedMemos,\n max: Math.max(acc.max, item.time),\n min: Math.min(acc.min, item.time),\n average: Number.isNaN(acc.average)\n ? item.time\n : (acc.average + item.time) / 2,\n mostOfTheTimesLessThan: quantile(sortedMemos, 90),\n };\n },\n {\n sortedMemos: [] as number[],\n memos: [] as number[],\n max: 0,\n min: Number.MAX_SAFE_INTEGER,\n average: NaN,\n mostOfTheTimesLessThan: NaN,\n }\n ),\n map((item) => ({\n numberOfSamples: item.memos.length,\n max: item.max,\n min: item.min,\n average: item.average,\n mostOfTheTimesLessThan: item.mostOfTheTimesLessThan,\n }))\n );\n}\n\ninterface IState {\n hit(name: string): void;\n memo(\n name: string,\n details?: IDetails,\n transformTookTime?: (metric: number) => number\n ): number | null;\n}\n\nlet cachedState: IState | null = null;\n\nfunction globalState() {\n if (cachedState) {\n return cachedState;\n }\n\n return (cachedState = createInitialState());\n}\n\nexport function createState(deps = defaultDeps) {\n return createInitialState(deps);\n}\n\nexport function attach(params: {\n name: string;\n from: TagNotification;\n till: TagNotification;\n cb?: (value: number) => void;\n details?: IDetails;\n transformTimeTook?: (value: number) => number;\n state?: IState;\n}) {\n return <T>(source: Observable<T>) => {\n const effectiveState = params.state || createInitialState();\n\n const startOp = () =>\n start({ name: params.name, on: params.from }, effectiveState);\n\n const stopOp = () =>\n stop(\n {\n name: params.name,\n till: params.till,\n cb: params.cb,\n transformTookTime: params.transformTimeTook,\n details: params.details,\n },\n effectiveState\n );\n\n return source.pipe((stream) => {\n if (params.till === 'unsubscribe' && params.from === 'complete') {\n return stream.pipe(startOp(), stopOp());\n } else {\n return stream.pipe(stopOp(), startOp());\n }\n });\n };\n}\n\nexport function registerStarts(\n params: {\n name: string;\n on: Observable<unknown>;\n },\n state = globalState()\n) {\n const hit = () => {\n state.hit(params.name);\n };\n\n return params.on.pipe(tap(hit), ignoreElements());\n}\n\nexport function start(\n paramsRaw: {\n name: string;\n on?: TagNotification;\n logger?: BasicLogger;\n },\n state = globalState()\n) {\n const params = {\n on: 'next' as const,\n ...paramsRaw,\n };\n return <T>(stream: Observable<T>) => {\n const hit = () => {\n state.hit(params.name);\n };\n\n return stream.pipe(\n executeOnNotifications(\n [params.on],\n hit,\n params.logger ?? defaultBasicLogger()\n )\n );\n };\n}\n\nexport function registerStops(\n params: {\n name: string;\n on: Observable<unknown>;\n details?: IDetails;\n cb?: (time: number) => void;\n transformTookTime?: (time: number) => number;\n },\n state = globalState()\n) {\n const setMemo = () => {\n const timeTook = state.memo(\n params.name,\n params.details,\n params.transformTookTime\n );\n if (typeof timeTook === 'number' && params.cb) {\n params.cb(timeTook);\n }\n };\n return params.on.pipe(tap(setMemo), ignoreElements());\n}\n\nexport function stop(\n paramsRaw: {\n name: string;\n till: TagNotification;\n details?: IDetails;\n cb?: (time: number) => void;\n transformTookTime?: (time: number) => number;\n logger?: BasicLogger;\n },\n state = globalState()\n) {\n const params = paramsRaw;\n return <T>(stream: Observable<T>) => {\n const setMemo = () => {\n const timeTook = state.memo(\n params.name,\n params.details,\n params.transformTookTime\n );\n if (typeof timeTook === 'number' && params.cb) {\n params.cb(timeTook);\n }\n };\n return stream.pipe(\n executeOnNotifications(\n [params.till],\n setMemo,\n params.logger ?? defaultBasicLogger()\n )\n );\n };\n}\n\nfunction quantile(\n input: number[],\n percentile: number,\n params?: { sorted: boolean }\n) {\n const array = params && params.sorted ? input : input.slice().sort();\n\n const index = (percentile / 100) * (array.length - 1);\n const i = Math.floor(index);\n if (i === index) {\n return array[index];\n } else {\n return array[i] + (array[i + 1] - array[i]) / 2;\n }\n}\n\ninterface ISummary {\n numberOfSamples: number;\n average: number;\n mostOfTheTimesLessThan: number;\n min: number;\n max: number;\n}\n\nexport function logSummaries(params: {\n name: string;\n on?: LogOn;\n logger?: Logger;\n}) {\n const summaries = createSummary(params.name);\n const logger = params.logger ?? defaultLogger;\n\n return summaries.pipe(\n logEvents({\n prefix: `${EOL}🔃 Profiler results for [${params.name}]`,\n suffix: [EOL],\n logger,\n ...(params.on && {\n on: params.on,\n }),\n }),\n ignoreElements()\n );\n}\n\nexport function timesRegistered(name?: string | RegExp) {\n return allMemos.pipe((stream) =>\n name ? stream.pipe(filter((item) => isMatch(item.name, name))) : stream\n );\n}\n\nexport function summariesLogged(name?: string) {\n return allSummaries.pipe((stream) =>\n name ? stream.pipe(filter((item) => isMatch(item.name, name))) : stream\n );\n}\n"],"file":"streams.js"}