@randajan/treelock/dist/cjs/index.cjs

A minimal async lock with timeout support and parent-child queueing.

var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);

// src/index.js
var index_exports = {};
__export(index_exports, {
  TreeLock: () => TreeLock,
  default: () => index_default
});
module.exports = __toCommonJS(index_exports);

// src/static.js
var import_sleep = require("@randajan/sleep");
var _privates = /* @__PURE__ */ new WeakMap();
var bfn = () => {
};
var Timeout = class extends Error {
};
var toInt = (num, min, max, errorName) => {
  if (num == null) {
    return;
  }
  const tp = typeof num;
  if (tp !== "number") {
    throw new Error(`Expects '${errorName}' to be a 'number' but received '${tp}'`);
  }
  if (min != null && num < min) {
    throw new Error(`Expects '${errorName}' to be greater than '${min}' but received '${num}'`);
  }
  if (max != null && num > max) {
    throw new Error(`Expects '${errorName}' to be lesser than '${max}' but received '${num}'`);
  }
  return Math.round(num);
};
var toTimeoutMs = (num) => toInt(num, 0, 2147483647, "timeout");
var withTimeout = (prom, tms) => {
  if (!tms) {
    return prom;
  }
  return Promise.race([prom, (0, import_sleep.timeout)(tms, new Timeout(`Execution time exceeded ${tms / 1e3}s`))]);
};
var toFn = (any, errorName) => {
  if (any == null) {
    return;
  }
  const tp = typeof any;
  if (tp !== "function") {
    throw new Error(`Expects '${errorName}' to be a 'number' but received '${tp}'`);
  }
  return any;
};

// src/TreeLock.js
var TreeLock = class _TreeLock {
  constructor(options = {}) {
    const { name, ttl, on, sup } = options;
    const _pp = _privates.get(sup);
    const _p = {
      sup,
      queue: Promise.resolve(),
      ram: 0,
      enqueue: !_pp ? (_) => _p.queue : (_) => Promise.all([_p.queue, _pp.queue]),
      ttl: toTimeoutMs(ttl) ?? _pp?.ttl,
      on: toFn(on) || _pp?.on || bfn
    };
    _p.append = (sub) => {
      if (_p.subs) {
        _p.subs.push(sub);
      } else {
        _p.subs = [sub];
        const enq = _p.enqueue;
        _p.enqueue = (_) => Promise.all([enq(), ..._p.subs.map((b) => b.queue)]);
      }
    };
    const finish = () => _p.ram = Math.max(0, _p.ram - 1);
    const done = (r) => {
      finish();
      _p.on(this, "done");
      return r;
    };
    const crash = (err) => {
      finish();
      const status = err instanceof Timeout ? "timeout" : "error";
      _p.on(this, status, err);
    };
    _p.run = (fn, tms, args) => {
      _p.ram++;
      if (this.ram + this.ramSup > 1) {
        _p.on(this, "enter");
      }
      const exec = () => {
        _p.on(this, "start");
        return withTimeout(fn(...args), tms).then(done);
      };
      const next = _p.enqueue().then(exec);
      _p.queue = next.catch(crash);
      return next;
    };
    const enumerable = true;
    Object.defineProperties(this, {
      name: { value: name },
      sup: { value: sup },
      subs: { get: (_) => [..._p.subs] },
      ram: { enumerable, get: (_) => _p.ram },
      ramSup: { enumerable, get: !_pp ? (_) => 0 : (_) => sup.ram + sup.ramSup },
      ramSub: { enumerable, get: (_) => _p.subs.reduce((r, s) => r + s.ram + s.ramSub, 0) },
      queue: { get: (_) => _p.queue }
    });
    _privates.set(this, _p);
    if (_pp) {
      _pp.append(this);
    }
  }
  run(fn, ttl, ...args) {
    const _p = _privates.get(this);
    ttl = toTimeoutMs(ttl) ?? _p.ttl;
    return _p.run(fn, ttl, args);
  }
  wrap(fn, ttl) {
    const _p = _privates.get(this);
    ttl = toTimeoutMs(ttl) ?? _p.ttl;
    return (...args) => _p.run(fn, ttl, args);
  }
  sub(options = {}) {
    return new _TreeLock({
      ...options,
      sup: this
    });
  }
};

// src/index.js
var index_default = (options = {}) => new TreeLock(options);
//# sourceMappingURL=index.js.map