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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | 1x 1x | import {
HttpEvent, HttpHandler, HttpInterceptor, HttpRequest
} from '@angular/common/http';
import { Injectable } from '@angular/core';
import { ActivatedRoute } from '@angular/router';
import { Observable, throwError, timer } from 'rxjs';
import { mergeMap, retryWhen } from 'rxjs/operators';
import { HttpRetryPolicy, HttpRetryPolicyNames } from './app.interfaces';
const retryPolicies: { [name in HttpRetryPolicyNames]: HttpRetryPolicy } = {
test: {
excludedStatusCodes: [401, 403],
retryPattern: [50, 500, 1000, 2000]
},
none: {
excludedStatusCodes: [],
retryPattern: []
}
};
@Injectable()
export class RetryInterceptor implements HttpInterceptor {
constructor(
private route: ActivatedRoute
) {}
// eslint-disable-next-line class-methods-use-this
intercept(request: HttpRequest<unknown>, next: HttpHandler): Observable<HttpEvent<unknown>> {
const routeData = this.route.firstChild?.routeConfig?.data ?? { httpRetryPolicy: 'none' };
const retryPolicyName = routeData.httpRetryPolicy;
const retryPolicy = retryPolicies[retryPolicyName as HttpRetryPolicyNames] ?? retryPolicies.none;
return next.handle(request)
.pipe(
retryWhen(
(attempts: Observable<any>) => attempts.pipe(
mergeMap((error, i) => {
const retryAttempt = i + 1;
Iif (
retryAttempt > retryPolicy.retryPattern.length ||
retryPolicy.excludedStatusCodes.find(e => e === error.status)
) {
return throwError(() => { throw error; });
}
// eslint-disable-next-line no-console
console.log(`Attempt ${retryAttempt}: retrying in ${retryPolicy.retryPattern[i]}ms`);
return timer(retryPolicy.retryPattern[i]);
})
)
)
);
}
}
|