unleash-server
Version:
Unleash is an enterprise ready feature flag service. It provides different strategies for handling feature flags.
64 lines • 1.92 kB
JavaScript
import { UnleashEvents } from 'unleash-client';
import EventEmitter from 'events';
export default class Repository extends EventEmitter {
constructor({ appName, bootstrapProvider, storageProvider, }) {
super();
this.data = {};
this.appName = appName;
this.bootstrapProvider = bootstrapProvider;
this.storageProvider = storageProvider;
this.segments = new Map();
}
async start() {
await this.loadBootstrap();
process.nextTick(() => this.emit(UnleashEvents.Ready));
}
createSegmentLookup(segments) {
if (!segments) {
return new Map();
}
return new Map(segments.map((segment) => [segment.id, segment]));
}
async save(response) {
this.data = this.convertToMap(response.features);
this.segments = this.createSegmentLookup(response.segments);
await this.storageProvider.set(this.appName, response);
}
notEmpty(content) {
return content.features.length > 0;
}
async loadBootstrap() {
try {
const content = await this.bootstrapProvider.readBootstrap();
if (content && this.notEmpty(content)) {
await this.save(content);
}
}
catch (_err) {
// intentionally left empty
}
}
convertToMap(features) {
const obj = features.reduce((o, feature) => {
const a = { ...o };
a[feature.name] = feature;
return a;
}, {});
return obj;
}
stop() {
if (this.timer) {
clearTimeout(this.timer);
}
}
getSegment(segmentId) {
return this.segments.get(segmentId);
}
getToggle(name) {
return this.data[name];
}
getToggles() {
return Object.keys(this.data).map((key) => this.data[key]);
}
}
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