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import metricsHelper from '../util/metrics-helper';
import { DB_TIME } from '../metric-events';
import { Logger, LogProvider } from '../logger';
import {
IFeatureToggleClient,
IFeatureToggleQuery,
IStrategyConfig,
} from '../types/model';
import { IFeatureToggleClientStore } from '../types/stores/feature-toggle-client-store';
import { DEFAULT_ENV } from '../util/constants';
import { PartialDeep } from '../types/partial';
import { IExperimentalOptions } from '../experimental';
import EventEmitter from 'events';
export interface FeaturesTable {
name: string;
description: string;
type: string;
stale: boolean;
variants: string;
project: string;
last_seen_at?: Date;
created_at?: Date;
}
export default class FeatureToggleClientStore
implements IFeatureToggleClientStore
{
private db: Knex;
private logger: Logger;
private experimental: IExperimentalOptions;
private timer: Function;
constructor(
db: Knex,
eventBus: EventEmitter,
getLogger: LogProvider,
experimental: IExperimentalOptions,
) {
this.db = db;
this.logger = getLogger('feature-toggle-client-store.ts');
this.experimental = experimental;
this.timer = (action) =>
metricsHelper.wrapTimer(eventBus, DB_TIME, {
store: 'feature-toggle',
action,
});
}
private async getAll(
featureQuery?: IFeatureToggleQuery,
archived: boolean = false,
isAdmin: boolean = true,
): Promise<IFeatureToggleClient[]> {
const environment = featureQuery?.environment || DEFAULT_ENV;
const stopTimer = this.timer('getFeatureAdmin');
const { inlineSegmentConstraints = false } =
this.experimental?.segments ?? {};
let selectColumns = [
'features.name as name',
'features.description as description',
'features.type as type',
'features.project as project',
'features.stale as stale',
'features.impression_data as impression_data',
'features.variants as variants',
'features.created_at as created_at',
'features.last_seen_at as last_seen_at',
'fe.enabled as enabled',
'fe.environment as environment',
'fs.id as strategy_id',
'fs.strategy_name as strategy_name',
'fs.parameters as parameters',
'fs.constraints as constraints',
];
if (inlineSegmentConstraints) {
selectColumns = [
...selectColumns,
'segments.id as segment_id',
'segments.constraints as segment_constraints',
];
}
let query = this.db('features')
.select(selectColumns)
.fullOuterJoin(
this.db('feature_strategies')
.select('*')
.where({ environment })
.as('fs'),
'fs.feature_name',
'features.name',
)
.fullOuterJoin(
this.db('feature_environments')
.select('feature_name', 'enabled', 'environment')
.where({ environment })
.as('fe'),
'fe.feature_name',
'features.name',
);
if (inlineSegmentConstraints) {
query = query
.fullOuterJoin(
'feature_strategy_segment as fss',
`fss.feature_strategy_id`,
`fs.id`,
)
.fullOuterJoin('segments', `segments.id`, `fss.segment_id`);
}
query = query.where({
archived,
});
if (featureQuery) {
if (featureQuery.tag) {
const tagQuery = this.db
.from('feature_tag')
.select('feature_name')
.whereIn(['tag_type', 'tag_value'], featureQuery.tag);
query = query.whereIn('features.name', tagQuery);
}
if (featureQuery.project) {
query = query.whereIn('project', featureQuery.project);
}
if (featureQuery.namePrefix) {
query = query.where(
'features.name',
'like',
`${featureQuery.namePrefix}%`,
);
}
}
const rows = await query;
stopTimer();
const featureToggles = rows.reduce((acc, r) => {
let feature: PartialDeep<IFeatureToggleClient> = acc[r.name] ?? {
strategies: [],
};
if (this.isUnseenStrategyRow(feature, r)) {
feature.strategies.push(
FeatureToggleClientStore.rowToStrategy(r),
);
}
if (inlineSegmentConstraints && r.segment_id) {
this.addSegmentToStrategy(feature, r);
}
feature.impressionData = r.impression_data;
feature.enabled = !!r.enabled;
feature.name = r.name;
feature.description = r.description;
feature.project = r.project;
feature.stale = r.stale;
feature.type = r.type;
feature.variants = r.variants;
feature.project = r.project;
if (isAdmin) {
feature.lastSeenAt = r.last_seen_at;
feature.createdAt = r.created_at;
}
acc[r.name] = feature;
return acc;
}, {});
const features: IFeatureToggleClient[] = Object.values(featureToggles);
if (!isAdmin) {
// We should not send strategy IDs from the client API,
// as this breaks old versions of the Go SDK (at least).
FeatureToggleClientStore.removeIdsFromStrategies(features);
}
return features;
}
private static rowToStrategy(row: Record<string, any>): IStrategyConfig {
return {
id: row.strategy_id,
name: row.strategy_name,
constraints: row.constraints || [],
parameters: row.parameters,
};
}
private static removeIdsFromStrategies(features: IFeatureToggleClient[]) {
features.forEach((feature) => {
feature.strategies.forEach((strategy) => {
delete strategy.id;
});
});
}
private isUnseenStrategyRow(
feature: PartialDeep<IFeatureToggleClient>,
row: Record<string, any>,
): boolean {
return (
row.strategy_id &&
!feature.strategies.find((s) => s.id === row.strategy_id)
);
}
private addSegmentToStrategy(
feature: PartialDeep<IFeatureToggleClient>,
row: Record<string, any>,
) {
feature.strategies
.find((s) => s.id === row.strategy_id)
?.constraints.push(...row.segment_constraints);
}
async getClient(
featureQuery?: IFeatureToggleQuery,
): Promise<IFeatureToggleClient[]> {
return this.getAll(featureQuery, false, false);
}
async getAdmin(
featureQuery?: IFeatureToggleQuery,
archived: boolean = false,
): Promise<IFeatureToggleClient[]> {
return this.getAll(featureQuery, archived, true);
}
}
module.exports = FeatureToggleClientStore;
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