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* AgentKits — Rate Limiter Module
*
* Simple in-memory rate limiter with request queuing.
* Configure max requests per minute per provider.
*
* Usage:
* import { createProviderRateLimiter } from 'agentkits/rate-limiter';
* const limiter = createProviderRateLimiter({ maxPerMinute: 60 });
* await limiter.acquire(); // waits if over limit
*/
import { RateLimitError, AgentKitsError } from '../errors/index.js';
// ── Types ──────────────────────────────────────────────────────────
export interface RateLimiterConfig {
/** Maximum requests per minute */
maxPerMinute: number;
/** Maximum queue size before rejecting (default: 100) */
maxQueueSize?: number;
}
export interface ProviderRateLimiter {
/** Acquire a slot — resolves when allowed, rejects if queue full */
acquire(): Promise<void>;
/** Current state */
readonly pending: number;
readonly windowCount: number;
/** Reset all state */
reset(): void;
}
// ── Implementation ─────────────────────────────────────────────────
export function createProviderRateLimiter(config: RateLimiterConfig): ProviderRateLimiter {
const { maxPerMinute, maxQueueSize = 100 } = config;
const timestamps: number[] = [];
const queue: Array<{ resolve: () => void; reject: (err: Error) => void }> = [];
let drainTimer: ReturnType<typeof setTimeout> | null = null;
function cleanWindow() {
const cutoff = Date.now() - 60_000;
while (timestamps.length > 0 && timestamps[0] <= cutoff) {
timestamps.shift();
}
}
function tryDrain() {
cleanWindow();
while (queue.length > 0 && timestamps.length < maxPerMinute) {
timestamps.push(Date.now());
const item = queue.shift()!;
item.resolve();
}
if (queue.length > 0 && !drainTimer) {
// Schedule next drain when oldest timestamp expires
const wait = timestamps[0] + 60_000 - Date.now() + 10;
drainTimer = setTimeout(() => {
drainTimer = null;
tryDrain();
}, Math.max(wait, 10));
}
}
return {
acquire(): Promise<void> {
cleanWindow();
if (timestamps.length < maxPerMinute) {
timestamps.push(Date.now());
return Promise.resolve();
}
if (queue.length >= maxQueueSize) {
return Promise.reject(new RateLimitError('[AgentKits] Rate limiter queue full'));
}
return new Promise((resolve, reject) => {
queue.push({ resolve, reject });
tryDrain();
});
},
get pending() {
return queue.length;
},
get windowCount() {
cleanWindow();
return timestamps.length;
},
reset() {
timestamps.length = 0;
if (drainTimer) {
clearTimeout(drainTimer);
drainTimer = null;
}
while (queue.length > 0) {
queue.shift()!.reject(new AgentKitsError('[AgentKits] Rate limiter reset', { code: 'RATE_LIMITER_RESET' }));
}
},
};
}
// ── Multi-provider limiter ─────────────────────────────────────────
export interface MultiProviderRateLimiterConfig {
/** Per-provider limits. Key is provider name. */
limits: Record<string, RateLimiterConfig>;
/** Default limit for unlisted providers */
defaultLimit?: RateLimiterConfig;
}
export function createMultiProviderRateLimiter(config: MultiProviderRateLimiterConfig) {
const limiters = new Map<string, ProviderRateLimiter>();
function getLimiter(provider: string): ProviderRateLimiter {
if (!limiters.has(provider)) {
const limiterConfig = config.limits[provider] ?? config.defaultLimit ?? { maxPerMinute: 60 };
limiters.set(provider, createProviderRateLimiter(limiterConfig));
}
return limiters.get(provider)!;
}
return {
acquire(provider: string): Promise<void> {
return getLimiter(provider).acquire();
},
getLimiter,
resetAll() {
for (const l of limiters.values()) l.reset();
limiters.clear();
},
};
}
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