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import { IUnleashConfig } from '../types/option';
import { Logger } from '../logger';
import {
FeatureToggle,
IFeatureOverview,
IProject,
IProjectHealthReport,
IProjectOverview,
} from '../types/model';
import { IFeatureToggleStore } from '../types/stores/feature-toggle-store';
import { IFeatureTypeStore } from '../types/stores/feature-type-store';
import { IProjectStore } from '../types/stores/project-store';
import FeatureToggleService from './feature-toggle-service';
import { hoursToMilliseconds } from 'date-fns';
import Timer = NodeJS.Timer;
export default class ProjectHealthService {
private logger: Logger;
private projectStore: IProjectStore;
private featureTypeStore: IFeatureTypeStore;
private featureToggleStore: IFeatureToggleStore;
private featureTypes: Map<string, number>;
private healthRatingTimer: Timer;
private featureToggleService: FeatureToggleService;
constructor(
{
projectStore,
featureTypeStore,
featureToggleStore,
}: Pick<
IUnleashStores,
'projectStore' | 'featureTypeStore' | 'featureToggleStore'
>,
{ getLogger }: Pick<IUnleashConfig, 'getLogger'>,
featureToggleService: FeatureToggleService,
) {
this.logger = getLogger('services/project-health-service.ts');
this.projectStore = projectStore;
this.featureTypeStore = featureTypeStore;
this.featureToggleStore = featureToggleStore;
this.featureTypes = new Map();
this.healthRatingTimer = setInterval(
() => this.setHealthRating(),
hoursToMilliseconds(1),
).unref();
this.featureToggleService = featureToggleService;
}
// TODO: duplicate from project-service.
async getProjectOverview(
projectId: string,
archived: boolean = false,
): Promise<IProjectOverview> {
const project = await this.projectStore.get(projectId);
const environments = await this.projectStore.getEnvironmentsForProject(
projectId,
);
const features = await this.featureToggleService.getFeatureOverview(
projectId,
archived,
);
const members = await this.projectStore.getMembers(projectId);
return {
name: project.name,
description: project.description,
health: project.health,
updatedAt: project.updatedAt,
environments,
features,
members,
version: 1,
};
}
async getProjectHealthReport(
projectId: string,
): Promise<IProjectHealthReport> {
const overview = await this.getProjectOverview(projectId, false);
return {
...overview,
potentiallyStaleCount: await this.potentiallyStaleCount(
overview.features,
),
activeCount: this.activeCount(overview.features),
staleCount: this.staleCount(overview.features),
};
}
private async potentiallyStaleCount(
features: Pick<FeatureToggle, 'createdAt' | 'stale' | 'type'>[],
): Promise<number> {
const today = new Date().valueOf();
if (this.featureTypes.size === 0) {
const types = await this.featureTypeStore.getAll();
types.forEach((type) => {
this.featureTypes.set(
type.name.toLowerCase(),
type.lifetimeDays,
);
});
}
return features.filter((feature) => {
const diff = today - feature.createdAt.valueOf();
const featureTypeExpectedLifetime = this.featureTypes.get(
feature.type,
);
return (
!feature.stale &&
diff >= featureTypeExpectedLifetime * hoursToMilliseconds(24)
);
}).length;
}
private activeCount(features: IFeatureOverview[]): number {
return features.filter((f) => !f.stale).length;
}
private staleCount(features: IFeatureOverview[]): number {
return features.filter((f) => f.stale).length;
}
async calculateHealthRating(project: IProject): Promise<number> {
const toggles = await this.featureToggleStore.getAll({
project: project.id,
archived: false,
});
const activeToggles = toggles.filter((feature) => !feature.stale);
const staleToggles = toggles.length - activeToggles.length;
const potentiallyStaleToggles = await this.potentiallyStaleCount(
activeToggles,
);
return this.getHealthRating(
toggles.length,
staleToggles,
potentiallyStaleToggles,
);
}
private getHealthRating(
toggleCount: number,
staleToggleCount: number,
potentiallyStaleCount: number,
): number {
const startPercentage = 100;
const stalePercentage = (staleToggleCount / toggleCount) * 100 || 0;
const potentiallyStalePercentage =
(potentiallyStaleCount / toggleCount) * 100 || 0;
const rating = Math.round(
startPercentage - stalePercentage - potentiallyStalePercentage,
);
return rating;
}
async setHealthRating(): Promise<void> {
const projects = await this.projectStore.getAll();
await Promise.all(
projects.map(async (project) => {
const newHealth = await this.calculateHealthRating(project);
await this.projectStore.updateHealth({
id: project.id,
health: newHealth,
});
}),
);
}
destroy(): void {
clearInterval(this.healthRatingTimer);
}
}
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