@antischematic/angular-state-library
Version:
Reactive state without boilerplate
133 lines • 20.2 kB
JavaScript
import { DOCUMENT } from "@angular/common";
import { inject, Injectable } from "@angular/core";
import { BehaviorSubject, debounce, EMPTY, filter, finalize, fromEvent, interval, merge, of, ReplaySubject, retry, share, startWith, Subject, switchAll, switchMap, takeUntil, tap, throttle, timer, } from "rxjs";
import { observeInZone } from "./utils";
import * as i0 from "@angular/core";
function onVisible(document, refCount) {
return toggle(refCount, fromEvent(document, "visibilitychange").pipe(filter(() => document.visibilityState === "visible")));
}
function onReconnect(document, refCount) {
const window = document.defaultView;
if (window) {
return toggle(refCount, fromEvent(window, "online"));
}
else {
return EMPTY;
}
}
function toggle(refCount, source) {
const delay = refCount.pipe(filter((count) => count > 0));
const resume = of(null);
return source.pipe(debounce(() => refCount.value > 0 ? resume : delay));
}
export class ResourceManager {
constructor() {
this.cache = new Map();
this.document = inject(DOCUMENT);
}
query(source, options) {
const key = this.keygen(options.key);
const { cache, document } = this;
if (cache.has(key)) {
const { resource, fetch, errors } = cache.get(key);
if (options.refreshIfStale !== false) {
fetch.next(source);
}
return merge(resource, errors);
}
const cancel = new Subject();
const invalidate = new Subject();
const fetch = new BehaviorSubject(source);
const refCount = new BehaviorSubject(0);
const invalidators = [fetch];
if (options.refreshOnFocus) {
invalidators.push(onVisible(document, refCount));
}
if (options.refreshOnReconnect) {
invalidators.push(onReconnect(document, refCount));
}
if (options.refreshInterval) {
const nativeInterval = observeInZone(interval(options.refreshInterval), Zone.root);
invalidators.push(toggle(refCount, nativeInterval));
}
const errors = new Subject();
const reload = merge(...invalidators).pipe(switchMap(() => fetch.pipe(takeUntil(cancel))), takeUntil(cancel), throttle(() => observeInZone(timer(options.staleTime ?? 0), Zone.root)));
const resource = invalidate.pipe(startWith(null), switchMap(() => reload), switchAll(), retry({
resetOnSuccess: true,
delay: (error, retryCount) => {
fetch.next(void 0);
errors.error(new QueryError(error, retryCount));
return resource;
}
}), share({
connector: () => new ReplaySubject(1, options.cacheTime ?? Infinity),
resetOnError: false,
resetOnComplete: false,
resetOnRefCountZero: false
}), tap({
subscribe: () => refCount.next(refCount.value + 1),
unsubscribe: () => refCount.next(refCount.value - 1)
}));
cache.set(key, {
resource,
errors,
fetch,
cancel,
invalidate,
source,
options
});
return merge(resource, errors);
}
mutate(source, options) {
const keys = options.invalidate ? Array.isArray(options.invalidate[0]) ? options.invalidate.map(this.keygen) : [this.keygen(options.invalidate)] : [];
for (const key of keys) {
this.invalidate(key, true);
}
return source.pipe(finalize(() => {
for (const key of keys) {
this.invalidate(key, false);
}
}));
}
revalidate(key) {
this.invalidate(this.keygen(key), true);
this.invalidate(this.keygen(key), false);
}
keygen(seed) {
return JSON.stringify(seed);
}
invalidate(key, doCancel) {
for (const [matchKey, { invalidate, cancel }] of this.cache) {
if (matchKey.startsWith(key.slice(0, key.length - 2))) {
if (doCancel) {
cancel.next();
}
else {
invalidate.next();
}
}
}
}
}
ResourceManager.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.0.0", ngImport: i0, type: ResourceManager, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
ResourceManager.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.0.0", ngImport: i0, type: ResourceManager, providedIn: "root" });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.0.0", ngImport: i0, type: ResourceManager, decorators: [{
type: Injectable,
args: [{ providedIn: "root" }]
}] });
export function useQuery(options) {
const resource = options.resource ?? inject(ResourceManager);
return source => resource.query(source, options);
}
export function useMutation(options) {
const resource = options.resource ?? inject(ResourceManager);
return source => resource.mutate(source, options);
}
export class QueryError {
constructor(error, retryCount) {
this.error = error;
this.retryCount = retryCount;
}
}
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{DOCUMENT} from \"@angular/common\";\nimport {inject, Injectable} from \"@angular/core\";\nimport {\n   BehaviorSubject,\n   debounce,\n   EMPTY,\n   filter,\n   finalize,\n   fromEvent,\n   interval,\n   merge,\n   MonoTypeOperatorFunction,\n   Observable,\n   of,\n   ReplaySubject,\n   retry,\n   share,\n   startWith,\n   Subject,\n   switchAll,\n   switchMap,\n   takeUntil,\n   tap,\n   throttle,\n   timer,\n} from \"rxjs\";\nimport {observeInZone} from \"./utils\";\n\nexport interface QueryOptions<T = any> {\n   key: unknown[]\n   refreshInterval?: number\n   refreshOnFocus?: boolean\n   refreshOnReconnect?: boolean\n   refreshIfStale?: boolean\n   staleTime?: number\n   cacheTime?: number\n   resource?: ResourceManager\n}\n\nexport interface MutateOptions {\n   invalidate?: unknown[] | unknown[][]\n   resource?: ResourceManager\n}\n\nfunction onVisible(document: Document, refCount: BehaviorSubject<any>) {\n   return toggle(refCount, fromEvent(document, \"visibilitychange\").pipe(\n      filter(() => document.visibilityState === \"visible\")\n   ))\n}\n\nfunction onReconnect(document: Document, refCount: BehaviorSubject<any>) {\n   const window = document.defaultView\n   if (window) {\n      return toggle(refCount, fromEvent(window, \"online\"))\n   } else {\n      return EMPTY\n   }\n}\n\nfunction toggle(refCount: BehaviorSubject<number>, source: Observable<any>) {\n   const delay = refCount.pipe(\n      filter((count) => count > 0)\n   )\n   const resume = of(null)\n   return source.pipe(\n      debounce(() => refCount.value > 0 ? resume : delay)\n   )\n}\n\n@Injectable({ providedIn: \"root\" })\nexport class ResourceManager {\n   cache = new Map()\n   document = inject(DOCUMENT)\n\n   query<T>(source: Observable<T>, options: QueryOptions): Observable<T> {\n      const key = this.keygen(options.key)\n      const { cache, document } = this\n\n      if (cache.has(key)) {\n         const { resource, fetch, errors } = cache.get(key)\n         if (options.refreshIfStale !== false) {\n            fetch.next(source)\n         }\n         return merge(resource, errors) as Observable<T>\n      }\n\n      const cancel = new Subject<void>()\n      const invalidate = new Subject<Observable<T>>()\n      const fetch = new BehaviorSubject<Observable<T>>(source)\n      const refCount = new BehaviorSubject(0)\n      const invalidators = [fetch] as Observable<any>[]\n\n      if (options.refreshOnFocus) {\n         invalidators.push(onVisible(document, refCount))\n      }\n\n      if (options.refreshOnReconnect) {\n         invalidators.push(onReconnect(document, refCount))\n      }\n\n      if (options.refreshInterval) {\n         const nativeInterval = observeInZone(interval(options.refreshInterval), Zone.root)\n         invalidators.push(toggle(refCount, nativeInterval))\n      }\n      const errors = new Subject<never>()\n\n      const reload = merge(...invalidators).pipe(\n         switchMap(() => fetch.pipe(\n            takeUntil(cancel)\n         )),\n         takeUntil(cancel),\n         throttle(() => observeInZone(timer(options.staleTime ?? 0), Zone.root)),\n      )\n\n      const resource: Observable<T> = invalidate.pipe(\n         startWith(null),\n         switchMap(() => reload),\n         switchAll(),\n         retry({\n            resetOnSuccess: true,\n            delay: (error, retryCount) => {\n               fetch.next(void 0 as any)\n               errors.error(new QueryError(error, retryCount))\n               return resource\n            }\n         }),\n         share({\n            connector: () => new ReplaySubject(1, options.cacheTime ?? Infinity),\n            resetOnError: false,\n            resetOnComplete: false,\n            resetOnRefCountZero: false\n         }),\n         tap({\n            subscribe: () => refCount.next(refCount.value + 1),\n            unsubscribe: () => refCount.next(refCount.value - 1)\n         })\n      )\n\n      cache.set(key, {\n         resource,\n         errors,\n         fetch,\n         cancel,\n         invalidate,\n         source,\n         options\n      })\n\n      return merge(resource, errors)\n   }\n\n   mutate<T>(source: Observable<T>, options: MutateOptions) {\n      const keys = options.invalidate ? Array.isArray(options.invalidate[0]) ? (options.invalidate as unknown[][]).map(this.keygen) : [this.keygen(options.invalidate)] : []\n      for (const key of keys) {\n         this.invalidate(key, true)\n      }\n      return source.pipe(\n         finalize(() => {\n            for (const key of keys) {\n               this.invalidate(key, false)\n            }\n         }),\n      )\n   }\n\n   revalidate(key: any[]) {\n      this.invalidate(this.keygen(key), true)\n      this.invalidate(this.keygen(key), false)\n   }\n\n   private keygen(seed: unknown[]) {\n      return JSON.stringify(seed)\n   }\n\n   private invalidate(key: string, doCancel: boolean) {\n      for (const [matchKey, { invalidate, cancel }] of this.cache) {\n         if (matchKey.startsWith(key.slice(0, key.length - 2))) {\n            if (doCancel) {\n               cancel.next()\n            } else {\n               invalidate.next()\n            }\n         }\n      }\n   }\n}\n\nexport function useQuery<T>(options: QueryOptions<T>): MonoTypeOperatorFunction<T> {\n   const resource = options.resource ?? inject(ResourceManager)\n   return source => resource.query(source, options)\n}\n\nexport function useMutation<T>(options: MutateOptions): MonoTypeOperatorFunction<T> {\n   const resource = options.resource ?? inject(ResourceManager)\n   return source => resource.mutate(source, options)\n}\n\nexport class QueryError {\n   constructor(public error: unknown, public retryCount: unknown) {}\n}\n"]}