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Injectable,
NotFoundException,
ConflictException,
} from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { FeatureFlag, FlagScope } from '../entities/feature-flag.entity';
import { TenantFlag } from '../entities/tenant-flag.entity';
import { UserFlag } from '../entities/user-flag.entity';
import { CreateFlagDto } from '../dto/create-flag.dto';
import { UpdateFlagDto } from '../dto/update-flag.dto';
import { SetTenantFlagDto, SetUserFlagDto } from '../dto/set-tenant-flag.dto';
import * as crypto from 'crypto';
export interface EvaluationContext {
tenantId?: string;
userId?: string;
planId?: string;
attributes?: Record<string, any>;
}
export interface FlagEvaluation {
key: string;
enabled: boolean;
value: any;
source: 'default' | 'global' | 'tenant' | 'user' | 'rollout';
}
@Injectable()
export class FeatureFlagsService {
constructor(
@InjectRepository(FeatureFlag)
private readonly flagRepository: Repository<FeatureFlag>,
@InjectRepository(TenantFlag)
private readonly tenantFlagRepository: Repository<TenantFlag>,
@InjectRepository(UserFlag)
private readonly userFlagRepository: Repository<UserFlag>,
) {}
// ==================== FLAG MANAGEMENT ====================
async createFlag(dto: CreateFlagDto): Promise<FeatureFlag> {
const existing = await this.flagRepository.findOne({
where: { key: dto.key },
});
if (existing) {
throw new ConflictException(`Flag with key '${dto.key}' already exists`);
}
const flag = this.flagRepository.create(dto);
return this.flagRepository.save(flag);
}
async updateFlag(id: string, dto: UpdateFlagDto): Promise<FeatureFlag> {
const flag = await this.flagRepository.findOne({ where: { id } });
if (!flag) {
throw new NotFoundException(`Flag with ID '${id}' not found`);
}
Object.assign(flag, dto);
return this.flagRepository.save(flag);
}
async deleteFlag(id: string): Promise<void> {
const flag = await this.flagRepository.findOne({ where: { id } });
if (!flag) {
throw new NotFoundException(`Flag with ID '${id}' not found`);
}
await this.flagRepository.remove(flag);
}
async getAllFlags(): Promise<FeatureFlag[]> {
return this.flagRepository.find({
order: { category: 'ASC', key: 'ASC' },
});
}
async getFlagByKey(key: string): Promise<FeatureFlag | null> {
return this.flagRepository.findOne({ where: { key } });
}
async getFlagById(id: string): Promise<FeatureFlag | null> {
return this.flagRepository.findOne({ where: { id } });
}
async toggleFlag(id: string, enabled: boolean): Promise<FeatureFlag> {
const flag = await this.flagRepository.findOne({ where: { id } });
if (!flag) {
throw new NotFoundException(`Flag with ID '${id}' not found`);
}
flag.is_enabled = enabled;
return this.flagRepository.save(flag);
}
// ==================== TENANT FLAGS ====================
async setTenantFlag(tenantId: string, dto: SetTenantFlagDto): Promise<TenantFlag> {
const flag = await this.flagRepository.findOne({ where: { id: dto.flag_id } });
if (!flag) {
throw new NotFoundException(`Flag with ID '${dto.flag_id}' not found`);
}
let tenantFlag = await this.tenantFlagRepository.findOne({
where: { tenant_id: tenantId, flag_id: dto.flag_id },
});
if (tenantFlag) {
tenantFlag.is_enabled = dto.is_enabled ?? tenantFlag.is_enabled;
tenantFlag.value = dto.value ?? tenantFlag.value;
tenantFlag.metadata = dto.metadata ?? tenantFlag.metadata;
} else {
tenantFlag = this.tenantFlagRepository.create({
tenant_id: tenantId,
flag_id: dto.flag_id,
is_enabled: dto.is_enabled ?? true,
value: dto.value,
metadata: dto.metadata,
});
}
return this.tenantFlagRepository.save(tenantFlag);
}
async removeTenantFlag(tenantId: string, flagId: string): Promise<void> {
const tenantFlag = await this.tenantFlagRepository.findOne({
where: { tenant_id: tenantId, flag_id: flagId },
});
if (tenantFlag) {
await this.tenantFlagRepository.remove(tenantFlag);
}
}
async getTenantFlags(tenantId: string): Promise<TenantFlag[]> {
return this.tenantFlagRepository.find({
where: { tenant_id: tenantId },
relations: ['flag'],
});
}
// ==================== USER FLAGS ====================
async setUserFlag(tenantId: string, dto: SetUserFlagDto): Promise<UserFlag> {
const flag = await this.flagRepository.findOne({ where: { id: dto.flag_id } });
Iif (!flag) {
throw new NotFoundException(`Flag with ID '${dto.flag_id}' not found`);
}
let userFlag = await this.userFlagRepository.findOne({
where: { user_id: dto.user_id, flag_id: dto.flag_id },
});
if (userFlag) {
userFlag.is_enabled = dto.is_enabled ?? userFlag.is_enabled;
userFlag.value = dto.value ?? userFlag.value;
userFlag.metadata = dto.metadata ?? userFlag.metadata;
} else {
userFlag = this.userFlagRepository.create({
tenant_id: tenantId,
user_id: dto.user_id,
flag_id: dto.flag_id,
is_enabled: dto.is_enabled ?? true,
value: dto.value,
metadata: dto.metadata,
});
}
return this.userFlagRepository.save(userFlag);
}
async removeUserFlag(userId: string, flagId: string): Promise<void> {
const userFlag = await this.userFlagRepository.findOne({
where: { user_id: userId, flag_id: flagId },
});
Iif (userFlag) {
await this.userFlagRepository.remove(userFlag);
}
}
async getUserFlags(tenantId: string, userId: string): Promise<UserFlag[]> {
return this.userFlagRepository.find({
where: { tenant_id: tenantId, user_id: userId },
relations: ['flag'],
});
}
// ==================== FLAG EVALUATION ====================
async evaluateFlag(key: string, context: EvaluationContext): Promise<FlagEvaluation> {
const flag = await this.flagRepository.findOne({ where: { key } });
if (!flag) {
return {
key,
enabled: false,
value: null,
source: 'default',
};
}
// Global flag disabled
if (!flag.is_enabled) {
return {
key,
enabled: false,
value: flag.default_value,
source: 'global',
};
}
// Check user-level override
if (context.userId) {
const userFlag = await this.userFlagRepository.findOne({
where: { user_id: context.userId, flag_id: flag.id },
});
Iif (userFlag) {
return {
key,
enabled: userFlag.is_enabled,
value: userFlag.value ?? flag.default_value,
source: 'user',
};
}
}
// Check tenant-level override
if (context.tenantId) {
const tenantFlag = await this.tenantFlagRepository.findOne({
where: { tenant_id: context.tenantId, flag_id: flag.id },
});
Iif (tenantFlag) {
return {
key,
enabled: tenantFlag.is_enabled,
value: tenantFlag.value ?? flag.default_value,
source: 'tenant',
};
}
}
// Check rollout percentage
if (flag.rollout_percentage !== null && flag.rollout_percentage < 100) {
const isInRollout = this.isInRollout(
flag.rollout_percentage,
context.userId || context.tenantId || 'anonymous',
flag.key,
);
return {
key,
enabled: isInRollout,
value: isInRollout ? flag.default_value : null,
source: 'rollout',
};
}
// Return global value
return {
key,
enabled: flag.is_enabled,
value: flag.default_value,
source: 'global',
};
}
async evaluateAllFlags(context: EvaluationContext): Promise<Record<string, FlagEvaluation>> {
const flags = await this.flagRepository.find();
const evaluations: Record<string, FlagEvaluation> = {};
for (const flag of flags) {
evaluations[flag.key] = await this.evaluateFlag(flag.key, context);
}
return evaluations;
}
async isEnabled(key: string, context: EvaluationContext): Promise<boolean> {
const evaluation = await this.evaluateFlag(key, context);
return evaluation.enabled;
}
async getValue<T = any>(key: string, context: EvaluationContext, defaultValue: T): Promise<T> {
const evaluation = await this.evaluateFlag(key, context);
return evaluation.enabled ? (evaluation.value ?? defaultValue) : defaultValue;
}
// ==================== HELPERS ====================
private isInRollout(percentage: number, identifier: string, flagKey: string): boolean {
// Create deterministic hash for consistent rollout
const hash = crypto
.createHash('md5')
.update(`${flagKey}:${identifier}`)
.digest('hex');
const hashInt = parseInt(hash.substring(0, 8), 16);
const normalized = hashInt / 0xffffffff;
return normalized * 100 < percentage;
}
}
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