@olegkon
To call the health check service endpoint from inside the Angular app on a button click, you can use Angular’s HttpClient module to send an HTTP request to the endpoint. Here’s an example:
import { Component } from '@angular/core';
import { HttpClient } from '@angular/common/http';
@Component({
selector: 'app-health-check',
templateUrl: './health-check.component.html',
styleUrls: ['./health-check.component.css']
})
export class HealthCheckComponent {
healthCheckResults: string[];
constructor(private http: HttpClient) { }
runHealthCheck() {
this.http.get<string[]>('/healthcheck').subscribe(
data => {
this.healthCheckResults = data;
},
error => {
console.log('Health check failed', error);
}
);
}
}
This code sends an HTTP GET request to the /healthcheck endpoint and subscribes to the response. The response is an array of strings, one for each web service being checked, indicating if the service is up or down.
To call the web service unit tests from the health check service, you can use HttpClient to send an HTTP request to the endpoint of each web service unit test. However, I would recommend against this approach as it can be slow and add unnecessary overhead to the health check service.
Instead, I suggest that you use a testing framework like Jasmine to execute the unit tests and report the results to the health check service. You can write a custom Jasmine reporter that sends the test results to the health check service endpoint. Here’s an example:
import { CustomReporterResult } from 'jasmine';
import { HttpClient } from '@angular/common/http';
class HealthCheckReporter {
constructor(private http: HttpClient) {}
jasmineStarted(suiteInfo: jasmine.SuiteInfo): void {
// Initialize health check results
}
specDone(result: CustomReporterResult): void {
// Update health check results with the status of the spec
}
jasmineDone(): void {
// Send health check results to the health check endpoint
this.http.post('/healthcheck', healthCheckResults).subscribe(
data => {
console.log('Health check results sent successfully', data);
},
error => {
console.log('Health check failed', error);
}
);
}
}
This code defines a custom Jasmine reporter that updates the health check results with the status of each spec and sends the results to the health check endpoint when all specs are done.
To run the Jasmine tests and generate the health check results, you can use the jasmine-core package in combination with the Karma test runner. Here’s an example of a Karma configuration file that runs the Jasmine tests and generates the health check results:
module.exports = function(config) {
config.set({
frameworks: ['jasmine'],
reporters: ['progress', 'custom'],
customReporters: [
{
reporter: HealthCheckReporter,
url: 'http://localhost:8080/healthcheck'
}
],
files: [
// Add your unit test files here
],
browsers: ['Chrome'],
singleRun: true
});
};
This code configures Karma to use the Jasmine framework, the progress reporter for the console output, and the custom reporter for the health check results. The custom reporter is configured to use the HealthCheckReporter class and send the health check results to the http://localhost:8080/healthcheck endpoint.
The health check results can be an array of booleans or objects indicating the status of each web service being checked. If all tests for a web service pass
If all tests for a web service pass, you can set the corresponding status to true. If one or more tests fail, you can set the corresponding status to false and add information about the failed tests.
Here’s an example of what the health check results might look like:
[
{ serviceName: 'Service1', status: true },
{ serviceName: 'Service2', status: false, message: 'Test1 failed' },
{ serviceName: 'Service3', status: true }
]
In this example, Service1 and Service3 are up and running (all their tests passed), while Service2 is down (at least one test failed). The message field provides additional information about the failed test.
Finally, to display the health check results in the Angular app, you can modify the runHealthCheck method to update the UI with the results. Here’s an example:
runHealthCheck() {
this.http.get<any[]>('/healthcheck').subscribe(
data => {
this.healthCheckResults = data;
// Update the UI with the health check results
this.healthCheckResults.forEach(result => {
const el = document.createElement('div');
el.textContent = `${result.serviceName}: ${result.status ? 'UP' : 'DOWN'}`;
if (!result.status) {
const errorEl = document.createElement('div');
errorEl.textContent = result.message;
el.appendChild(errorEl);
}
document.body.appendChild(el);
});
},
error => {
console.log('Health check failed', error);
}
);
}
This code updates the healthCheckResults property with the results returned by the health check endpoint and creates a new div element for each web service being checked. The text content of the div element shows the name of the service and its status (either “UP” or “DOWN”). If a service is down, an additional div element is created to show the error message. The div elements are appended to the body element. You can modify this code to display the health check results in a more user-friendly way (e.g. using a table or a list).