@anexia/registry-loading-interceptor
Version:
This library provides an interceptor which maps Http Requests to a Loading State.
81 lines • 13.5 kB
JavaScript
import { Inject, Injectable } from '@angular/core';
import { BehaviorSubject, of, throwError } from 'rxjs';
import { catchError, finalize, map, switchMap, tap } from "rxjs/operators";
import { REQUEST_ID_GENERATOR } from "../tokens/request-id-generator-strategy";
import { REQUEST_FILTER } from "../tokens/request-filter-strategy";
import * as i0 from "@angular/core";
import * as i1 from "../tokens/request-id-generator-strategy";
import * as i2 from "../tokens/request-filter-strategy";
export class RegistryLoadingInterceptor {
constructor(requestIdGenerator, requestFilter) {
this.requestIdGenerator = requestIdGenerator;
this.requestFilter = requestFilter;
this.loadingDictionary = new Map();
this.stateChangeTrigger$ = new BehaviorSubject(false);
this.networkRequestCounter$ = new BehaviorSubject(0);
this.loadingState$ = this.stateChangeTrigger$
.asObservable()
.pipe(switchMap(() => of(this.loadingDictionary)));
this.isAnyRequestLoading$ = this.networkRequestCounter$
.asObservable()
.pipe(map(count => count > 0));
}
static mapEventTypeToLoading(event) {
return (event === null || event === void 0 ? void 0 : event.type) === 0;
}
intercept(request, delegate) {
let requestCancelled = true;
return delegate.handle(request)
.pipe(map((event) => {
if ((event === null || event === void 0 ? void 0 : event.type) === 4) {
requestCancelled = false;
}
return event;
}), this.mapHttpEventToLoadingCount$(), this.mapHttpEventToLoadingState$(request), catchError(error => {
requestCancelled = false;
this.updateLoadingCounter(false);
if (!this.requestFilter.exclude(request)) {
this.updateLoadingState(this.getRequestId(request), false);
}
return throwError(error);
}), finalize(() => {
if (requestCancelled) {
this.decrementCounter();
}
}));
}
mapHttpEventToLoadingState$(request) {
if (this.requestFilter.exclude(request)) {
return tap();
}
return tap(event => this.updateLoadingState(this.getRequestId(request), RegistryLoadingInterceptor.mapEventTypeToLoading(event)));
}
mapHttpEventToLoadingCount$() {
return tap(event => this.updateLoadingCounter(RegistryLoadingInterceptor.mapEventTypeToLoading(event)));
}
updateLoadingState(requestId, isLoading) {
this.loadingDictionary.set(requestId, isLoading);
this.stateChangeTrigger$.next(true);
}
updateLoadingCounter(isLoading) {
isLoading ? this.incrementCounter() : this.decrementCounter();
}
getRequestId(request) {
return this.requestIdGenerator.createId(request);
}
incrementCounter() {
this.networkRequestCounter$.next(this.networkRequestCounter$.value + 1);
}
decrementCounter() {
this.networkRequestCounter$.next(this.networkRequestCounter$.value - 1);
}
}
RegistryLoadingInterceptor.ɵprov = i0.ɵɵdefineInjectable({ factory: function RegistryLoadingInterceptor_Factory() { return new RegistryLoadingInterceptor(i0.ɵɵinject(i1.REQUEST_ID_GENERATOR), i0.ɵɵinject(i2.REQUEST_FILTER)); }, token: RegistryLoadingInterceptor, providedIn: "root" });
RegistryLoadingInterceptor.decorators = [
{ type: Injectable, args: [{ providedIn: 'root' },] }
];
RegistryLoadingInterceptor.ctorParameters = () => [
{ type: undefined, decorators: [{ type: Inject, args: [REQUEST_ID_GENERATOR,] }] },
{ type: undefined, decorators: [{ type: Inject, args: [REQUEST_FILTER,] }] }
];
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{Inject, Injectable} from '@angular/core';\nimport {HttpEvent, HttpHandler, HttpInterceptor, HttpRequest} from '@angular/common/http';\nimport {BehaviorSubject, Observable, of, OperatorFunction, throwError} from 'rxjs';\nimport {LoadingDictionary} from \"../types/loading-dictionary\";\nimport {catchError, finalize, map, switchMap, tap} from \"rxjs/operators\";\nimport {REQUEST_ID_GENERATOR} from \"../tokens/request-id-generator-strategy\";\nimport {RequestIdGeneratorStrategy} from \"../interfaces/request-id-generator-strategy\";\nimport {REQUEST_FILTER} from \"../tokens/request-filter-strategy\";\nimport {RequestFilterStrategy} from \"../interfaces/request-filter-strategy\";\n\n@Injectable({providedIn: 'root'})\nexport class RegistryLoadingInterceptor implements HttpInterceptor {\n\n  /**\n   * registry exposing the loading state of watched http requests\n   */\n  public loadingState$: Observable<LoadingDictionary>;\n  /**\n   *  monitors if any http request is loading by counting references.\n   */\n  public isAnyRequestLoading$: Observable<boolean>;\n\n  private readonly loadingDictionary: LoadingDictionary;\n  private readonly stateChangeTrigger$: BehaviorSubject<boolean>;\n  private readonly networkRequestCounter$: BehaviorSubject<number>;\n\n  public constructor(\n    @Inject(REQUEST_ID_GENERATOR) private readonly requestIdGenerator: RequestIdGeneratorStrategy,\n    @Inject(REQUEST_FILTER) private readonly requestFilter: RequestFilterStrategy\n  ) {\n\n    this.loadingDictionary = new Map();\n    this.stateChangeTrigger$ = new BehaviorSubject<boolean>(false);\n    this.networkRequestCounter$ = new BehaviorSubject<number>(0);\n    this.loadingState$ = this.stateChangeTrigger$\n      .asObservable()\n      .pipe(switchMap(() => of(this.loadingDictionary)));\n\n    this.isAnyRequestLoading$ = this.networkRequestCounter$\n      .asObservable()\n      .pipe(map(count => count > 0));\n  }\n\n  private static mapEventTypeToLoading(event: HttpEvent<any>): boolean {\n    return event?.type === 0;\n  }\n\n  public intercept(request: HttpRequest<unknown>, delegate: HttpHandler): Observable<HttpEvent<unknown>> {\n    let requestCancelled = true;\n    return delegate.handle(request)\n      .pipe(\n        map((event: HttpEvent<any>) => {\n          if (event?.type === 4) {\n            requestCancelled = false;\n          }\n          return event;\n        }),\n        this.mapHttpEventToLoadingCount$(),\n        this.mapHttpEventToLoadingState$(request),\n        catchError(error => {\n          requestCancelled = false;\n          this.updateLoadingCounter(false);\n          if(!this.requestFilter.exclude(request)) {\n            this.updateLoadingState(this.getRequestId(request), false);\n          }\n          return throwError(error);\n        }),\n        finalize(() => {\n          if (requestCancelled) {\n            this.decrementCounter();\n          }\n        })\n      );\n  }\n\n  private mapHttpEventToLoadingState$(request: HttpRequest<unknown>): OperatorFunction<HttpEvent<any>, HttpEvent<any>> {\n    if (this.requestFilter.exclude(request)) {\n      return tap();\n    }\n    return tap(event =>\n      this.updateLoadingState(\n        this.getRequestId(request),\n        RegistryLoadingInterceptor.mapEventTypeToLoading(event)\n      )\n    );\n  }\n\n  private mapHttpEventToLoadingCount$(): OperatorFunction<HttpEvent<any>, HttpEvent<any>> {\n    return tap(event =>\n      this.updateLoadingCounter(RegistryLoadingInterceptor.mapEventTypeToLoading(event))\n    )\n  }\n\n  private updateLoadingState(requestId: string, isLoading: boolean): void {\n    this.loadingDictionary.set(requestId, isLoading);\n    this.stateChangeTrigger$.next(true);\n  }\n\n  private updateLoadingCounter(isLoading: boolean): void {\n    isLoading ? this.incrementCounter() : this.decrementCounter();\n  }\n\n  private getRequestId(request: HttpRequest<unknown>): string {\n    return this.requestIdGenerator.createId(request);\n  }\n\n  private incrementCounter(): void {\n    this.networkRequestCounter$.next(this.networkRequestCounter$.value + 1);\n  }\n\n  private decrementCounter(): void {\n    this.networkRequestCounter$.next(this.networkRequestCounter$.value - 1);\n  }\n}\n"]}