eureka-js-client
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A JavaScript implementation the Netflix OSS service registry, Eureka.
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<a href="../index.html">all files</a> / <a href="index.html">src/</a> ConfigClusterResolver.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import Logger from './Logger';
/*
Locates a Eureka host using static configuration. Configuration can either be
done using a simple host and port, or a map of serviceUrls.
*/
export default class ConfigClusterResolver {
constructor(config, logger) {
this.logger = logger || new Logger();
this.config = config;
this.serviceUrls = this.buildServiceUrls();
}
resolveEurekaUrl(callback, retryAttempt = 0) {
if (this.serviceUrls.length > 1 && retryAttempt > 0) {
this.serviceUrls.push(this.serviceUrls.shift());
}
callback(null, this.serviceUrls[0]);
}
buildServiceUrls() {
const { host, port, servicePath, ssl,
serviceUrls, preferSameZone } = this.config.eureka;
const { dataCenterInfo } = this.config.instance;
const metadata = dataCenterInfo ? dataCenterInfo.metadata : undefined;
const instanceZone = metadata ? metadata['availability-zone'] : undefined;
const urls = [];
const zones = this.getAvailabilityZones();
if (serviceUrls) {
zones.forEach((zone) => {
if (<span class="missing-if-branch" title="else path not taken" >E</span>serviceUrls[zone]) {
if (preferSameZone && instanceZone && instanceZone === zone) {
urls.unshift(...serviceUrls[zone]);
}
urls.push(...serviceUrls[zone]);
}
});
}
if (!urls.length) {
const protocol = s</span>sl ? <span class="branch-0 cbranch-no" title="branch not covered" >'https' : 'http';
urls.push(`${protocol}://${host}:${port}${servicePath}`);
}
return urls;
}
getAvailabilityZones() {
const { ec2Region, availabilityZones } = this.config.eureka;
if (ec2Region && availabilityZones && availabilityZones[ec2Region]) {
return availabilityZones[ec2Region];
}
return ['default'];
}
}
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