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<div class="content injectable">
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<ol class="breadcrumb">
<li>Injectables</li>
<li>GlobalErrorHandler</li>
</ol>
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<a href="#info" role="tab" id="info-tab" data-toggle="tab" data-link="info">Info</a>
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<p class="comment">
<h3>File</h3>
</p>
<p class="comment">
<code>src/app/_helpers/global-error-handler.ts</code>
</p>
<p class="comment">
<h3>Description</h3>
</p>
<p class="comment">
<p>Provides a hook for centralized exception handling.</p>
</p>
<p class="comment">
<h3>Extends</h3>
</p>
<p class="comment">
<code><a href="https://angular.io/api/core/ErrorHandler" target="_blank" >ErrorHandler</a></code>
</p>
<p class="comment">
<h3>Example</h3>
</p>
<div class="io-description">
</div>
<section>
<h3 id="index">Index</h3>
<table class="table table-sm table-bordered index-table">
<tbody>
<tr>
<td class="col-md-4">
<h6><b>Properties</b></h6>
</td>
</tr>
<tr>
<td class="col-md-4">
<ul class="index-list">
<li>
<span class="modifier">Private</span>
<a href="#sentencesForWarningLogging">sentencesForWarningLogging</a>
</li>
</ul>
</td>
</tr>
<tr>
<td class="col-md-4">
<h6><b>Methods</b></h6>
</td>
</tr>
<tr>
<td class="col-md-4">
<ul class="index-list">
<li>
<a href="#handleError">handleError</a>
</li>
<li>
<span class="modifier">Private</span>
<a href="#isWarning">isWarning</a>
</li>
<li>
<a href="#logError">logError</a>
</li>
</ul>
</td>
</tr>
</tbody>
</table>
</section>
<section>
<h3 id="constructor">Constructor</h3>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<code>constructor(loggingService: <a href="../injectables/LoggingService.html">LoggingService</a>, router: <a href="https://angular.io/api/router/Router" target="_blank">Router</a>)</code>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-line">Defined in <a href="" data-line="41" class="link-to-prism">src/app/_helpers/global-error-handler.ts:41</a></div>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-description"><p>Initialization of the Global Error Handler.</p>
</div>
<div>
<b>Parameters :</b>
<table class="params">
<thead>
<tr>
<td>Name</td>
<td>Type</td>
<td>Optional</td>
<td>Description</td>
</tr>
</thead>
<tbody>
<tr>
<td>loggingService</td>
<td>
<code><a href="../injectables/LoggingService.html" target="_self" >LoggingService</a></code>
</td>
<td>
No
</td>
<td>
<code><ul>
<li>A service that provides logging capabilities.</li>
</ul>
</code>
</td>
</tr>
<tr>
<td>router</td>
<td>
<code><a href="https://angular.io/api/router/Router" target="_blank" >Router</a></code>
</td>
<td>
No
</td>
<td>
<code><ul>
<li>A service that provides navigation among views and URL manipulation capabilities.</li>
</ul>
</code>
</td>
</tr>
</tbody>
</table>
</div>
</td>
</tr>
</tbody>
</table>
</section>
<section>
<h3 id="methods">
Methods
</h3>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="handleError"></a>
<span class="name">
<b>
handleError
</b>
<a href="#handleError"><span class="icon ion-ios-link"></span></a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
<code>handleError(error: Error)</code>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-line">Defined in <a href="" data-line="58"
class="link-to-prism">src/app/_helpers/global-error-handler.ts:58</a></div>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-description"><p>Handles different types of errors.</p>
</div>
<div class="io-description">
<b>Parameters :</b>
<table class="params">
<thead>
<tr>
<td>Name</td>
<td>Type</td>
<td>Optional</td>
<td>Description</td>
</tr>
</thead>
<tbody>
<tr>
<td>error</td>
<td>
<code>Error</code>
</td>
<td>
No
</td>
<td>
<ul>
<li>An error objects thrown when a runtime errors occurs.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</div>
<div>
</div>
<div class="io-description">
<b>Returns : </b> <code><a href="https://www.typescriptlang.org/docs/handbook/basic-types.html" target="_blank" >void</a></code>
</div>
<div class="io-description">
</div>
</td>
</tr>
</tbody>
</table>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="isWarning"></a>
<span class="name">
<b>
<span class="modifier">Private</span>
isWarning
</b>
<a href="#isWarning"><span class="icon ion-ios-link"></span></a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
<span class="modifier-icon icon ion-ios-reset"></span>
<code>isWarning(errorTraceString: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank">string</a>)</code>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-line">Defined in <a href="" data-line="84"
class="link-to-prism">src/app/_helpers/global-error-handler.ts:84</a></div>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-description"><p>Checks if an error is of type warning.</p>
</div>
<div class="io-description">
<b>Parameters :</b>
<table class="params">
<thead>
<tr>
<td>Name</td>
<td>Type</td>
<td>Optional</td>
<td>Description</td>
</tr>
</thead>
<tbody>
<tr>
<td>errorTraceString</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>
<td>
<ul>
<li>A description of the error and it's stack trace.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</div>
<div>
</div>
<div class="io-description">
<b>Returns : </b> <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/boolean" target="_blank" >boolean</a></code>
</div>
<div class="io-description">
<p>true - If the error is of type warning.</p>
</div>
</td>
</tr>
</tbody>
</table>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="logError"></a>
<span class="name">
<b>
logError
</b>
<a href="#logError"><span class="icon ion-ios-link"></span></a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
<code>logError(error: <a href="https://www.typescriptlang.org/docs/handbook/basic-types.html" target="_blank">any</a>)</code>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-line">Defined in <a href="" data-line="104"
class="link-to-prism">src/app/_helpers/global-error-handler.ts:104</a></div>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-description"><p>Write appropriate logs according to the type of error.</p>
</div>
<div class="io-description">
<b>Parameters :</b>
<table class="params">
<thead>
<tr>
<td>Name</td>
<td>Type</td>
<td>Optional</td>
<td>Description</td>
</tr>
</thead>
<tbody>
<tr>
<td>error</td>
<td>
<code><a href="https://www.typescriptlang.org/docs/handbook/basic-types.html" target="_blank" >any</a></code>
</td>
<td>
No
</td>
<td>
<ul>
<li>An error objects thrown when a runtime errors occurs.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</div>
<div>
</div>
<div class="io-description">
<b>Returns : </b> <code><a href="https://www.typescriptlang.org/docs/handbook/basic-types.html" target="_blank" >void</a></code>
</div>
<div class="io-description">
</div>
</td>
</tr>
</tbody>
</table>
</section>
<section>
<h3 id="inputs">
Properties
</h3>
<table class="table table-sm table-bordered">
<tbody>
<tr>
<td class="col-md-4">
<a name="sentencesForWarningLogging"></a>
<span class="name">
<b>
<span class="modifier">Private</span>
sentencesForWarningLogging</b>
<a href="#sentencesForWarningLogging"><span class="icon ion-ios-link"></span></a>
</span>
</td>
</tr>
<tr>
<td class="col-md-4">
<i>Type : </i> <code>Array<string></code>
</td>
</tr>
<tr>
<td class="col-md-4">
<i>Default value : </i><code>[]</code>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-line">Defined in <a href="" data-line="41" class="link-to-prism">src/app/_helpers/global-error-handler.ts:41</a></div>
</td>
</tr>
<tr>
<td class="col-md-4">
<div class="io-description"><p>An array of sentence sections that denote warnings.</p>
</div>
</td>
</tr>
</tbody>
</table>
</section>
</div>
<div class="tab-pane fade tab-source-code" id="c-source">
<pre class="line-numbers compodoc-sourcecode"><code class="language-typescript">import { HttpErrorResponse } from '@angular/common/http';
import { ErrorHandler, Injectable } from '@angular/core';
import { Router } from '@angular/router';
// Application imports
import { LoggingService } from '@app/_services/logging.service';
/**
* A generalized http response error.
*
* @extends Error
*/
export class HttpError extends Error {
/** The error's status code. */
public status: number;
/**
* Initialize the HttpError class.
*
* @param message - The message given by the error.
* @param status - The status code given by the error.
*/
constructor(message: string, status: number) {
super(message);
this.status = status;
this.name = 'HttpError';
}
}
/**
* Provides a hook for centralized exception handling.
*
* @extends ErrorHandler
*/
@Injectable()
export class GlobalErrorHandler extends ErrorHandler {
/**
* An array of sentence sections that denote warnings.
*/
private sentencesForWarningLogging: Array<string> = [];
/**
* Initialization of the Global Error Handler.
*
* @param loggingService - A service that provides logging capabilities.
* @param router - A service that provides navigation among views and URL manipulation capabilities.
*/
constructor(private loggingService: LoggingService, private router: Router) {
super();
}
/**
* Handles different types of errors.
*
* @param error - An error objects thrown when a runtime errors occurs.
*/
handleError(error: Error): void {
this.logError(error);
const message: string = error.message ? error.message : error.toString();
// if (error.status) {
// error = new Error(message);
// }
const errorTraceString: string = `Error message:\n${message}.\nStack trace: ${error.stack}`;
const isWarning: boolean = this.isWarning(errorTraceString);
if (isWarning) {
this.loggingService.sendWarnLevelMessage(errorTraceString, { error });
} else {
this.loggingService.sendErrorLevelMessage(errorTraceString, this, { error });
}
throw error;
}
/**
* Checks if an error is of type warning.
*
* @param errorTraceString - A description of the error and it's stack trace.
* @returns true - If the error is of type warning.
*/
private isWarning(errorTraceString: string): boolean {
let isWarning: boolean = true;
if (errorTraceString.includes('/src/app/')) {
isWarning = false;
}
this.sentencesForWarningLogging.forEach((whiteListSentence: string) => {
if (errorTraceString.includes(whiteListSentence)) {
isWarning = true;
}
});
return isWarning;
}
/**
* Write appropriate logs according to the type of error.
*
* @param error - An error objects thrown when a runtime errors occurs.
*/
logError(error: any): void {
const route: string = this.router.url;
if (error instanceof HttpErrorResponse) {
this.loggingService.sendErrorLevelMessage(
`There was an HTTP error on route ${route}.\n${error.message}.\nStatus code: ${
(error as HttpErrorResponse).status
}`,
this,
{ error }
);
} else if (error instanceof TypeError) {
this.loggingService.sendErrorLevelMessage(
`There was a Type error on route ${route}.\n${error.message}`,
this,
{ error }
);
} else if (error instanceof Error) {
this.loggingService.sendErrorLevelMessage(
`There was a general error on route ${route}.\n${error.message}`,
this,
{ error }
);
} else {
this.loggingService.sendErrorLevelMessage(
`Nobody threw an error but something happened on route ${route}!`,
this,
{ error }
);
}
}
}
export function rejectBody(error): { status: any; statusText: any } {
return {
status: error.status,
statusText: error.statusText,
};
}
</code></pre>
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