resilient-http-client
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This is an augmented [Angular HttpClient][angular-http-client] which overrides the get method to enrich resilience behaviour.
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<li class="breadcrumb-item" >ResilientHttpClientService</li>
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<code>projects/resilient-http-client/src/lib/service/resilient-http-client.service.ts</code>
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<h6><b>Methods</b></h6>
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<li>
<span class="modifier">Public</span>
<a href="#get" >get</a>
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<code>constructor(httpClient: HttpClient)</code>
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<div class="io-line">Defined in <a href="" data-line="13" class="link-to-prism">projects/resilient-http-client/src/lib/service/resilient-http-client.service.ts:13</a></div>
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<b>Parameters :</b>
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<td>Name</td>
<td>Type</td>
<td>Optional</td>
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<td>httpClient</td>
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<code>HttpClient</code>
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<td>
No
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Methods
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<a name="get"></a>
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<span class="modifier">Public</span>
<span ><b>get</b></span>
<a href="#get"><span class="icon ion-ios-link"></span></a>
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<code>get(url: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank">string</a>, resilienceConfig: <a href="../interfaces/IResilienceConfig.html" target="_self">Partial<IResilienceConfig></a>, options?: <a href="../undefineds/THttpGetOption.html" target="_self">THttpGetOption</a>)</code>
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<div class="io-line">Defined in <a href="" data-line="16"
class="link-to-prism">projects/resilient-http-client/src/lib/service/resilient-http-client.service.ts:16</a></div>
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<b>Type parameters :</b>
<ul class="type-parameters">
<li>T</li>
</ul>
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<div class="io-description">
<b>Parameters :</b>
<table class="params">
<thead>
<tr>
<td>Name</td>
<td>Type</td>
<td>Optional</td>
</tr>
</thead>
<tbody>
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<td>url</td>
<td>
<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank" >string</a></code>
</td>
<td>
No
</td>
</tr>
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<td>resilienceConfig</td>
<td>
<code><a href="../interfaces/IResilienceConfig.html" target="_self" >Partial<IResilienceConfig></a></code>
</td>
<td>
No
</td>
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<td>options</td>
<td>
<code><a href="../miscellaneous/typealiases.html#THttpGetOption" target="_self" >THttpGetOption</a></code>
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<td>
Yes
</td>
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<b>Returns : </b> <code>Observable<T></code>
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<div class="io-description">
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<pre class="line-numbers compodoc-sourcecode"><code class="language-typescript">import { HttpClient, HttpResponse } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { catchError, finalize, map, Observable, of, take, tap, throwError, timer } from 'rxjs';
import { applyResilience, shouldLogResult, shouldTrace } from '../util/rx/resilience.rx-operator';
import { v4 as uuidv4 } from 'uuid';
import { THttpGetOption } from '../model/type/http-get-options.type';
import { IResilienceConfig } from '../model/type/resilience.rx-operator.type';
import { DEFAULT_RESILIENCE_CONFIG } from '../util/rx/resilience.rx-operator.config';
@Injectable({
providedIn: 'root',
})
export class ResilientHttpClientService {
constructor(private readonly httpClient: HttpClient) {}
public get<T>(url: string, resilienceConfig: Partial<IResilienceConfig>, options?: THttpGetOption): Observable<T> {
const finalConfig = {
...DEFAULT_RESILIENCE_CONFIG,
...resilienceConfig,
} as IResilienceConfig;
const uuid = uuidv4();
const isDelayedSubscription = timer(finalConfig.isDelayedAfterMs)
.pipe(take(1))
.subscribe(() => {
finalConfig.onRequestDelayed(finalConfig.topic, uuid);
});
const timeStart = Date.now();
finalConfig.onRequestStart(finalConfig.topic, uuid);
return this.httpClient
.get<T>(url, {
...options,
observe: 'response',
})
.pipe(
applyResilience(finalConfig, uuid),
map((res: HttpResponse<T>) => res.body as T),
tap((res) => {
if (shouldLogResult(finalConfig)) {
// eslint-disable-next-line no-console
console.log(finalConfig.topic, res);
}
}),
catchError((err) => {
const topicRelatedConfig = finalConfig.topicToConfigDict[finalConfig.topic];
if (topicRelatedConfig) {
if (topicRelatedConfig.failoverResponse) {
return of(topicRelatedConfig.failoverResponse as T);
}
}
return throwError(() => err);
}),
finalize(() => {
if (shouldTrace(finalConfig)) {
const timeEnd = Date.now();
// eslint-disable-next-line no-console
console.log(
`Fetch time in ms of call-topic ${finalConfig.topic}:`,
finalConfig.topic,
uuid,
timeEnd - timeStart,
);
}
finalConfig.onRequestFinalize(finalConfig.topic, uuid);
isDelayedSubscription.unsubscribe();
}),
);
}
}
</code></pre>
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