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import EventEmitter from 'events';
import metricsHelper from '../util/metrics-helper';
import { DB_TIME } from '../metric-events';
import NotFoundError from '../error/notfound-error';
import { Logger, LogProvider } from '../logger';
import { FeatureToggle, FeatureToggleDTO, IVariant } from '../types/model';
import { IFeatureToggleStore } from '../types/stores/feature-toggle-store';
const FEATURE_COLUMNS = [
'name',
'description',
'type',
'project',
'stale',
'variants',
'created_at',
'impression_data',
'last_seen_at',
];
export interface FeaturesTable {
name: string;
description: string;
type: string;
stale: boolean;
variants?: string;
project: string;
last_seen_at?: Date;
created_at?: Date;
impression_data: boolean;
}
const TABLE = 'features';
export default class FeatureToggleStore implements IFeatureToggleStore {
private db: Knex;
private logger: Logger;
private timer: Function;
constructor(db: Knex, eventBus: EventEmitter, getLogger: LogProvider) {
this.db = db;
this.logger = getLogger('feature-toggle-store.ts');
this.timer = (action) =>
metricsHelper.wrapTimer(eventBus, DB_TIME, {
store: 'feature-toggle',
action,
});
}
async count(
query: {
archived?: boolean;
project?: string;
stale?: boolean;
} = { archived: false },
): Promise<number> {
return this.db
.from(TABLE)
.count('*')
.where(query)
.then((res) => Number(res[0].count));
}
async deleteAll(): Promise<void> {
await this.db(TABLE).del();
}
destroy(): void {}
async get(name: string): Promise<FeatureToggle> {
return this.db
.first(FEATURE_COLUMNS)
.from(TABLE)
.where({ name })
.then(this.rowToFeature);
}
async getAll(
query: {
archived?: boolean;
project?: string;
stale?: boolean;
} = { archived: false },
): Promise<FeatureToggle[]> {
const rows = await this.db
.select(FEATURE_COLUMNS)
.from(TABLE)
.where(query);
return rows.map(this.rowToFeature);
}
async getFeatures(archived: boolean): Promise<FeatureToggle[]> {
const rows = await this.db
.select(FEATURE_COLUMNS)
.from(TABLE)
.where({ archived });
return rows.map(this.rowToFeature);
}
/**
* Get projectId from feature filtered by name. Used by Rbac middleware
* @deprecated
* @param name
*/
async getProjectId(name: string): Promise<string> {
return this.db
.first(['project'])
.from(TABLE)
.where({ name })
.then((r) => (r ? r.project : undefined))
.catch((e) => {
this.logger.error(e);
return undefined;
});
}
async exists(name: string): Promise<boolean> {
const result = await this.db.raw(
'SELECT EXISTS (SELECT 1 FROM features WHERE name = ?) AS present',
[name],
);
const { present } = result.rows[0];
return present;
}
async getArchivedFeatures(): Promise<FeatureToggle[]> {
const rows = await this.db
.select(FEATURE_COLUMNS)
.from(TABLE)
.where({ archived: true })
.orderBy('name', 'asc');
return rows.map(this.rowToFeature);
}
async setLastSeen(toggleNames: string[]): Promise<void> {
const now = new Date();
try {
await this.db(TABLE)
.update({ last_seen_at: now })
.whereIn(
'name',
this.db(TABLE)
.select('name')
.whereIn('name', toggleNames)
.forUpdate()
.skipLocked(),
);
} catch (err) {
this.logger.error('Could not update lastSeen, error: ', err);
}
}
rowToFeature(row: FeaturesTable): FeatureToggle {
if (!row) {
throw new NotFoundError('No feature toggle found');
}
const sortedVariants = (row.variants as unknown as IVariant[]) || [];
sortedVariants.sort((a, b) => a.name.localeCompare(b.name));
return {
name: row.name,
description: row.description,
type: row.type,
project: row.project,
stale: row.stale,
variants: sortedVariants,
createdAt: row.created_at,
lastSeenAt: row.last_seen_at,
impressionData: row.impression_data,
};
}
rowToVariants(row: FeaturesTable): IVariant[] {
if (!row) {
throw new NotFoundError('No feature toggle found');
}
const sortedVariants = (row.variants as unknown as IVariant[]) || [];
sortedVariants.sort((a, b) => a.name.localeCompare(b.name));
return sortedVariants;
}
dtoToRow(project: string, data: FeatureToggleDTO): FeaturesTable {
const row = {
name: data.name,
description: data.description,
type: data.type,
project,
archived: data.archived || false,
stale: data.stale,
created_at: data.createdAt,
impression_data: data.impressionData,
};
if (!row.created_at) {
delete row.created_at;
}
return row;
}
async create(
project: string,
data: FeatureToggleDTO,
): Promise<FeatureToggle> {
try {
const row = await this.db(TABLE)
.insert(this.dtoToRow(project, data))
.returning(FEATURE_COLUMNS);
return this.rowToFeature(row[0]);
} catch (err) {
this.logger.error('Could not insert feature, error: ', err);
}
return undefined;
}
async update(
project: string,
data: FeatureToggleDTO,
): Promise<FeatureToggle> {
const row = await this.db(TABLE)
.where({ name: data.name })
.update(this.dtoToRow(project, data))
.returning(FEATURE_COLUMNS);
return this.rowToFeature(row[0]);
}
async archive(name: string): Promise<FeatureToggle> {
const row = await this.db(TABLE)
.where({ name })
.update({ archived: true })
.returning(FEATURE_COLUMNS);
return this.rowToFeature(row[0]);
}
async delete(name: string): Promise<void> {
await this.db(TABLE)
.where({ name, archived: true }) // Feature toggle must be archived to allow deletion
.del();
}
async revive(name: string): Promise<FeatureToggle> {
const row = await this.db(TABLE)
.where({ name })
.update({ archived: false })
.returning(FEATURE_COLUMNS);
return this.rowToFeature(row[0]);
}
async getVariants(featureName: string): Promise<IVariant[]> {
const row = await this.db(TABLE)
.select('variants')
.where({ name: featureName });
return this.rowToVariants(row[0]);
}
async saveVariants(
project: string,
featureName: string,
newVariants: IVariant[],
): Promise<FeatureToggle> {
const row = await this.db(TABLE)
.update({ variants: JSON.stringify(newVariants) })
.where({ project: project, name: featureName })
.returning(FEATURE_COLUMNS);
return this.rowToFeature(row[0]);
}
}
module.exports = FeatureToggleStore;
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