/
feature-toggle-client-store.ts
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/
feature-toggle-client-store.ts
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import { Knex } from 'knex';
import metricsHelper from '../util/metrics-helper';
import { DB_TIME } from '../metric-events';
import { Logger, LogProvider } from '../logger';
import {
IFeatureToggleClient,
IFeatureToggleQuery,
IStrategyConfig,
ITag,
} from '../types/model';
import { IFeatureToggleClientStore } from '../types/stores/feature-toggle-client-store';
import { DEFAULT_ENV } from '../util/constants';
import { PartialDeep } from '../types/partial';
import EventEmitter from 'events';
import FeatureToggleStore from './feature-toggle-store';
import { ensureStringValue } from '../util/ensureStringValue';
import { mapValues } from '../util/map-values';
import { IFlagResolver } from '../types/experimental';
import Raw = Knex.Raw;
export interface FeaturesTable {
name: string;
description: string;
type: string;
stale: boolean;
variants: string;
project: string;
last_seen_at?: Date;
created_at?: Date;
}
export interface IGetAllFeatures {
featureQuery?: IFeatureToggleQuery;
archived: boolean;
isAdmin: boolean;
includeStrategyIds?: boolean;
userId?: number;
}
export interface IGetAdminFeatures {
featureQuery?: IFeatureToggleQuery;
archived?: boolean;
userId?: number;
}
export default class FeatureToggleClientStore
implements IFeatureToggleClientStore
{
private db: Knex;
private logger: Logger;
private inlineSegmentConstraints: boolean;
private timer: Function;
private flagResolver: IFlagResolver;
constructor(
db: Knex,
eventBus: EventEmitter,
getLogger: LogProvider,
inlineSegmentConstraints: boolean,
flagResolver: IFlagResolver,
) {
this.db = db;
this.logger = getLogger('feature-toggle-client-store.ts');
this.inlineSegmentConstraints = inlineSegmentConstraints;
this.timer = (action) =>
metricsHelper.wrapTimer(eventBus, DB_TIME, {
store: 'feature-toggle',
action,
});
this.flagResolver = flagResolver;
}
private async getAll({
featureQuery,
archived,
isAdmin,
includeStrategyIds,
userId,
}: IGetAllFeatures): Promise<IFeatureToggleClient[]> {
const environment = featureQuery?.environment || DEFAULT_ENV;
const stopTimer = this.timer('getFeatureAdmin');
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',
'fe.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',
'segments.id as segment_id',
'segments.constraints as segment_constraints',
] as (string | Raw<any>)[];
let query = this.db('features')
.modify(FeatureToggleStore.filterByArchived, archived)
.leftJoin(
this.db('feature_strategies')
.select('*')
.where({ environment })
.as('fs'),
'fs.feature_name',
'features.name',
)
.leftJoin(
this.db('feature_environments')
.select(
'feature_name',
'enabled',
'environment',
'variants',
)
.where({ environment })
.as('fe'),
'fe.feature_name',
'features.name',
)
.leftJoin(
'feature_strategy_segment as fss',
`fss.feature_strategy_id`,
`fs.id`,
)
.leftJoin('segments', `segments.id`, `fss.segment_id`);
if (isAdmin) {
if (this.flagResolver.isEnabled('toggleTagFiltering')) {
query = query.leftJoin(
'feature_tag as ft',
'ft.feature_name',
'features.name',
);
selectColumns = [
...selectColumns,
'ft.tag_value as tag_value',
'ft.tag_type as tag_type',
];
}
if (userId && this.flagResolver.isEnabled('favorites')) {
query = query.leftJoin(`favorite_features`, function () {
this.on(
'favorite_features.feature',
'features.name',
).andOnVal('favorite_features.user_id', '=', userId);
});
selectColumns = [
...selectColumns,
this.db.raw(
'favorite_features.feature is not null as favorite',
),
];
}
}
query = query.select(selectColumns);
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 (this.isNewTag(feature, r)) {
this.addTag(feature, r);
}
if (featureQuery?.inlineSegmentConstraints && r.segment_id) {
this.addSegmentToStrategy(feature, r);
} else if (
!featureQuery?.inlineSegmentConstraints &&
r.segment_id
) {
this.addSegmentIdsToStrategy(feature, r);
}
feature.impressionData = r.impression_data;
feature.enabled = !!r.enabled;
feature.name = r.name;
feature.favorite = r.favorite;
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 && !includeStrategyIds) {
// 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: mapValues(row.parameters || {}, ensureStringValue),
};
}
private static rowToTag(row: Record<string, any>): ITag {
return {
value: row.tag_value,
type: row.tag_type,
};
}
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 addTag(
feature: Record<string, any>,
row: Record<string, any>,
): void {
const tags = feature.tags || [];
const newTag = FeatureToggleClientStore.rowToTag(row);
feature.tags = [...tags, newTag];
}
private isNewTag(
feature: PartialDeep<IFeatureToggleClient>,
row: Record<string, any>,
): boolean {
return (
row.tag_type &&
row.tag_value &&
!feature.tags?.some(
(tag) =>
tag.type === row.tag_type && tag.value === row.tag_value,
)
);
}
private addSegmentToStrategy(
feature: PartialDeep<IFeatureToggleClient>,
row: Record<string, any>,
) {
feature.strategies
.find((s) => s.id === row.strategy_id)
?.constraints.push(...row.segment_constraints);
}
private addSegmentIdsToStrategy(
feature: PartialDeep<IFeatureToggleClient>,
row: Record<string, any>,
) {
const strategy = feature.strategies.find(
(s) => s.id === row.strategy_id,
);
if (!strategy) {
return;
}
if (!strategy.segments) {
strategy.segments = [];
}
strategy.segments.push(row.segment_id);
}
async getClient(
featureQuery?: IFeatureToggleQuery,
includeStrategyIds?: boolean,
): Promise<IFeatureToggleClient[]> {
return this.getAll({
featureQuery,
archived: false,
isAdmin: false,
includeStrategyIds,
});
}
async getAdmin({
featureQuery,
userId,
archived,
}: IGetAdminFeatures): Promise<IFeatureToggleClient[]> {
return this.getAll({ featureQuery, archived, isAdmin: true, userId });
}
}
module.exports = FeatureToggleClientStore;