nanoresource-promise/dist/index.cjs

Promises based nanoresource

var __create = Object.create;
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __getProtoOf = Object.getPrototypeOf;
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 __toESM = (mod, isNodeMode, target) => (target = mod != null ? __create(__getProtoOf(mod)) : {}, __copyProps(
  isNodeMode || !mod || !mod.__esModule ? __defProp(target, "default", { value: mod, enumerable: true }) : target,
  mod
));
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);

// src/index.js
var src_exports = {};
__export(src_exports, {
  NanoresourcePromise: () => NanoresourcePromise
});
module.exports = __toCommonJS(src_exports);

// src/nanoresource-cb.js
var import_proc_nexttick = __toESM(require("proc-nexttick"), 1);
var preopening = Symbol("opening when closing");
var opening = Symbol("opening queue");
var preclosing = Symbol("closing when inactive");
var closing = Symbol("closing queue");
var sync = Symbol("sync");
var fastClose = Symbol("fast close");
var reopen = Symbol("allow reopen");
var init = Symbol("init state");
function noop() {
}
var Nanoresource = class {
  constructor(opts) {
    if (!opts)
      opts = {};
    if (opts.open)
      this._open = opts.open;
    if (opts.close)
      this._close = opts.close;
    this[init]();
    this[reopen] = opts.reopen || false;
    this[preopening] = null;
    this[opening] = null;
    this[preclosing] = null;
    this[closing] = null;
    this[sync] = false;
    this[fastClose] = true;
  }
  [init]() {
    this.opening = false;
    this.opened = false;
    this.closing = false;
    this.closed = false;
    this.actives = 0;
  }
  _open(cb) {
    cb(null);
  }
  _close(cb) {
    cb(null);
  }
  open(cb) {
    if (!cb)
      cb = noop;
    if (this.closing || this.closed) {
      if (!this[reopen]) {
        return (0, import_proc_nexttick.default)(cb, new Error("Resource is closed"));
      }
      if (this.closing) {
        if (!this[preopening])
          this[preopening] = [];
        this[preopening].push(cb);
        return;
      }
      this[init]();
    }
    if (this.opened)
      return (0, import_proc_nexttick.default)(cb);
    if (this[opening]) {
      this[opening].push(cb);
      return;
    }
    this.opening = true;
    this[opening] = [cb];
    this[sync] = true;
    this._open(onopen.bind(this));
    this[sync] = false;
  }
  active(cb) {
    if (this[fastClose] && this[preclosing] || this[closing] || this.closed) {
      if (cb)
        (0, import_proc_nexttick.default)(cb, new Error("Resource is closed"));
      return false;
    }
    this.actives++;
    return true;
  }
  inactive(cb, err, val) {
    if (!--this.actives) {
      const queue = this[preclosing];
      if (queue) {
        this[preclosing] = null;
        while (queue.length)
          this.close(queue.shift());
      }
    }
    if (cb)
      cb(err, val);
  }
  close(allowActive, cb) {
    if (typeof allowActive === "function")
      return this.close(false, allowActive);
    if (!cb)
      cb = noop;
    if (allowActive)
      this[fastClose] = false;
    if (this.closed)
      return (0, import_proc_nexttick.default)(cb);
    if (this.actives || this[opening]) {
      if (!this[preclosing])
        this[preclosing] = [];
      this[preclosing].push(cb);
      return;
    }
    if (!this.opened) {
      this.closed = true;
      (0, import_proc_nexttick.default)(cb);
      return;
    }
    if (this[closing]) {
      this[closing].push(cb);
      return;
    }
    this.closing = true;
    this[closing] = [cb];
    this[sync] = true;
    this._close(onclose.bind(this));
    this[sync] = false;
  }
};
function onopen(err) {
  if (this[sync])
    return (0, import_proc_nexttick.default)(onopen.bind(this), err);
  const oqueue = this[opening];
  this[opening] = null;
  this.opening = false;
  this.opened = !err;
  while (oqueue.length)
    oqueue.shift()(err);
  const cqueue = this[preclosing];
  if (cqueue && !this.actives) {
    this[preclosing] = null;
    while (cqueue.length)
      this.close(cqueue.shift());
  }
}
function onclose(err) {
  if (this[sync])
    return (0, import_proc_nexttick.default)(onclose.bind(this), err);
  const queue = this[closing];
  this.closing = false;
  this[closing] = null;
  this.closed = !err;
  while (queue.length)
    queue.shift()(err);
  const cqueue = this[preopening];
  if (cqueue) {
    this[preopening] = null;
    while (cqueue.length)
      this.open(cqueue.shift());
  }
}

// src/index.js
function callbackPromise() {
  let callback;
  const promise = new Promise((resolve, reject) => {
    callback = (err, value) => {
      if (err)
        reject(err);
      else
        resolve(value);
    };
  });
  callback.promise = promise;
  return callback;
}
var kNanoresource = Symbol("nanoresource");
var NanoresourcePromise = class {
  constructor(opts = {}) {
    const open = opts.open || this._open.bind(this);
    const close = opts.close || this._close.bind(this);
    this[kNanoresource] = new Nanoresource({
      open: (cb) => processPromise(open, cb),
      close: (cb) => processPromise(close, cb),
      reopen: opts.reopen
    });
  }
  get opened() {
    return this[kNanoresource].opened;
  }
  get opening() {
    return this[kNanoresource].opening;
  }
  get closed() {
    return this[kNanoresource].closed;
  }
  get closing() {
    return this[kNanoresource].closing;
  }
  get actives() {
    return this[kNanoresource].actives;
  }
  open() {
    const callback = callbackPromise();
    this[kNanoresource].open(callback);
    return callback.promise;
  }
  close(allowActive = false) {
    const callback = callbackPromise();
    this[kNanoresource].close(allowActive, callback);
    return callback.promise;
  }
  active(cb) {
    return this[kNanoresource].active(cb);
  }
  inactive(cb, err, value) {
    return this[kNanoresource].inactive(cb, err, value);
  }
  async _open() {
  }
  async _close() {
  }
};
async function processPromise(fnPromise, cb) {
  try {
    await fnPromise();
    cb();
  } catch (err) {
    cb(err);
  }
}
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  NanoresourcePromise
});
//# sourceMappingURL=index.cjs.map