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import { config as serverConfig } from "../config";
const logger = new Logger("RateLimiter");
interface RateLimitEntry {
timestamps: number[];
blockedUntil: number;
lastActivity: number;
}
export interface RateLimitConfig {
maxRequests: number;
windowMs: number;
blockDurationMs: number;
}
export type RateLimitResult = { allowed: true } | {
allowed: false;
retryAfter: number;
};
export class IdentityRateLimiter {
private readonly identityLimits = new Map<string, RateLimitEntry>();
private readonly cleanupInterval: NodeJS.Timeout;
private rejectedTotal = 0;
constructor(
private readonly name: string,
private readonly rateConfig: RateLimitConfig,
) {
this.cleanupInterval = setInterval(
() => this.cleanup(),
serverConfig.server.simulationRateLimitCleanupIntervalMs,
);
this.cleanupInterval.unref?.();
logger.info(
`${name} rate limiter initialized: ${rateConfig.maxRequests} request(s) per ${rateConfig.windowMs}ms`,
);
}
checkLimit(identity: string): RateLimitResult {
const now = Date.now();
let entry = this.identityLimits.get(identity);
if (!entry) {
entry = { timestamps: [now], blockedUntil: 0, lastActivity: now };
this.identityLimits.set(identity, entry);
return { allowed: true };
}
entry.lastActivity = now;
if (now < entry.blockedUntil) {
this.rejectedTotal++;
return {
allowed: false,
retryAfter: Math.max(1, Math.ceil((entry.blockedUntil - now) / 1_000)),
};
}
if (entry.blockedUntil > 0) {
entry.blockedUntil = 0;
entry.timestamps = [];
}
const cutoff = now - this.rateConfig.windowMs;
entry.timestamps = entry.timestamps.filter((timestamp) => timestamp > cutoff);
if (entry.timestamps.length >= this.rateConfig.maxRequests) {
entry.blockedUntil = now + this.rateConfig.blockDurationMs;
this.rejectedTotal++;
logger.warn(
`${this.name} rate limit exceeded; blocking identity for ${this.rateConfig.blockDurationMs}ms`,
);
return {
allowed: false,
retryAfter: Math.max(
1,
Math.ceil(this.rateConfig.blockDurationMs / 1_000),
),
};
}
entry.timestamps.push(now);
return { allowed: true };
}
private cleanup(): void {
const cutoff =
Date.now() - serverConfig.server.simulationRateLimitInactiveTtlMs;
for (const [identity, entry] of this.identityLimits) {
if (entry.lastActivity < cutoff) this.identityLimits.delete(identity);
}
}
destroy(): void {
clearInterval(this.cleanupInterval);
this.identityLimits.clear();
}
getStats() {
const now = Date.now();
return {
config: this.rateConfig,
activeClients: this.identityLimits.size,
blockedClients: Array.from(this.identityLimits.values()).filter(
(entry) => entry.blockedUntil > now,
).length,
rejectedTotal: this.rejectedTotal,
};
}
}
const SIMULATION_DEFAULTS: RateLimitConfig = {
maxRequests: serverConfig.server.simulationRateLimitMaxRequests,
windowMs: serverConfig.server.simulationRateLimitWindowMs,
blockDurationMs: serverConfig.server.simulationRateLimitBlockDurationMs,
};
const COMPILE_DEFAULTS: RateLimitConfig = {
maxRequests: serverConfig.server.compileRateLimitMaxRequests,
windowMs: serverConfig.server.compileRateLimitWindowMs,
blockDurationMs: serverConfig.server.compileRateLimitBlockDurationMs,
};
export class SimulationRateLimiter extends IdentityRateLimiter {
private static instance: SimulationRateLimiter | null = null;
private constructor(config: Partial<RateLimitConfig> = {}) {
super("Simulation start", { ...SIMULATION_DEFAULTS, ...config });
}
static getInstance(config?: Partial<RateLimitConfig>): SimulationRateLimiter {
SimulationRateLimiter.instance ??= new SimulationRateLimiter(config);
return SimulationRateLimiter.instance;
}
}
export class CompileRateLimiter extends IdentityRateLimiter {
private static instance: CompileRateLimiter | null = null;
private constructor(config: Partial<RateLimitConfig> = {}) {
super("Compile", { ...COMPILE_DEFAULTS, ...config });
}
static getInstance(config?: Partial<RateLimitConfig>): CompileRateLimiter {
CompileRateLimiter.instance ??= new CompileRateLimiter(config);
return CompileRateLimiter.instance;
}
}
export const getSimulationRateLimiter = (): SimulationRateLimiter =>
SimulationRateLimiter.getInstance();
export const getCompileRateLimiter = (): CompileRateLimiter =>
CompileRateLimiter.getInstance();
export class TutorRateLimiter extends IdentityRateLimiter {
private static instance: TutorRateLimiter | null = null;
private constructor(config: Partial<RateLimitConfig> = {}) {
super("Tutor", {
maxRequests: serverConfig.tutor.rateLimitMaxRequests,
windowMs: serverConfig.tutor.rateLimitWindowMs,
blockDurationMs: serverConfig.tutor.rateLimitBlockDurationMs,
...config,
});
}
static getInstance(config?: Partial<RateLimitConfig>): TutorRateLimiter {
TutorRateLimiter.instance ??= new TutorRateLimiter(config);
return TutorRateLimiter.instance;
}
}
export const getTutorRateLimiter = (): TutorRateLimiter =>
TutorRateLimiter.getInstance();
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