@unkey/ratelimit/dist/index.mjs

<div align="center"> <h1 align="center">@unkey/ratelimit</h1> <h5>@unkey/ratelimit is a library for fast global ratelimiting in serverless functions.</h5> </div>

// src/noop.ts
var NoopRatelimit = class {
  limit(_identifier, _opts) {
    return Promise.resolve({
      limit: 0,
      remaining: 0,
      reset: 0,
      success: true
    });
  }
};

// src/ratelimit.ts
import { Unkey } from "@unkey/api";
import { UnkeyError } from "@unkey/api/models/errors/unkeyerror";

// src/duration.ts
function ms(d) {
  if (typeof d === "number") {
    return d;
  }
  const match = d.match(/^(\d+)\s?(ms|s|m|h|d)$/);
  if (!match) {
    throw new Error(`Unable to parse window size: ${d}`);
  }
  const time = Number.parseInt(match[1]);
  const unit = match[2];
  switch (unit) {
    case "ms":
      return time;
    case "s":
      return time * 1e3;
    case "m":
      return time * 1e3 * 60;
    case "h":
      return time * 1e3 * 60 * 60;
    case "d":
      return time * 1e3 * 60 * 60 * 24;
    default:
      throw new Error(`Unable to parse window size: ${d}`);
  }
}

// src/ratelimit.ts
var Ratelimit = class {
  config;
  unkey;
  cache;
  constructor(config) {
    this.config = config;
    this.unkey = new Unkey({
      serverURL: config.baseUrl,
      rootKey: config.rootKey
    });
    this.cache = config.cache ?? /* @__PURE__ */ new Map();
  }
  /**
   * Limit a specific identifier, you can override a lot of things about this specific request using
   * the 2nd argument.
   *
   * @example
   * ```ts
   * const identifier = getIpAddress() // or userId or anything else
   * const res = await unkey.limit(identifier)
   *
   * if (!res.success){
   *   // reject request
   * }
   * // handle request
   * ```
   */
  async limit(identifier, opts) {
    try {
      return await this._limit(
        identifier,
        opts?.limit?.limit ?? this.config.limit,
        ms(opts?.limit?.duration ?? this.config.duration),
        opts?.cost ?? 1
      );
    } catch (e) {
      if (typeof this.config.onError !== "function") {
        throw e;
      }
      const err = e instanceof UnkeyError ? new Error(e.message) : e instanceof Error ? e : new Error(String(e));
      return await this.config.onError(err, identifier);
    }
  }
  // _limit just handles the racing and caching. It must not handle errors, those are handled by limit
  async _limit(identifier, limit, duration, cost) {
    const cacheKey = `${this.config.namespace}:${identifier}:${limit}:${duration}`;
    const naughty = this.cache.get(cacheKey);
    if (naughty) {
      if (naughty.reset > Date.now()) {
        return naughty;
      } else {
        this.cache.delete(cacheKey);
      }
    }
    const timeout = this.config.timeout === false ? null : this.config.timeout ?? {
      ms: 5e3,
      fallback: () => ({
        success: false,
        limit: 0,
        remaining: 0,
        reset: Date.now()
      })
    };
    let timeoutId = null;
    try {
      const ps = [
        this.unkey.ratelimit.limit({
          namespace: this.config.namespace,
          identifier,
          limit,
          duration,
          cost
        }).then(async (res2) => {
          return res2.data;
        })
      ];
      if (timeout) {
        ps.push(
          new Promise((resolve) => {
            timeoutId = setTimeout(async () => {
              const resolvedValue = typeof timeout.fallback === "function" ? await timeout.fallback(identifier) : timeout.fallback;
              resolve(resolvedValue);
            }, ms(timeout.ms));
          })
        );
      }
      const res = await Promise.race(ps);
      if (!res.success) {
        this.cache.set(cacheKey, res);
      }
      return res;
    } finally {
      if (timeoutId) {
        clearTimeout(timeoutId);
      }
    }
  }
};

// src/overrides.ts
import { Unkey as Unkey2 } from "@unkey/api";
var Overrides = class {
  unkey;
  constructor(config) {
    this.unkey = new Unkey2({
      serverURL: config.baseUrl,
      rootKey: config.rootKey
    });
  }
  getOverride(request, options) {
    return this.unkey.ratelimit.getOverride(request, options);
  }
  setOverride(request, options) {
    return this.unkey.ratelimit.setOverride(request, options);
  }
  deleteOverride(request, options) {
    return this.unkey.ratelimit.deleteOverride(request, options);
  }
  listOverrides(request, options) {
    return this.unkey.ratelimit.listOverrides(request, options);
  }
};
export {
  NoopRatelimit,
  Overrides,
  Ratelimit
};
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