node/test/parallel/test-fs-stream-construct-compat-graceful-fs.js

'use strict';

const common = require('../common');
const fs = require('fs');
const assert = require('assert');
const fixtures = require('../common/fixtures');

const tmpdir = require('../common/tmpdir');
tmpdir.refresh();

{
  // Compat with graceful-fs.

  function ReadStream(...args) {
    fs.ReadStream.call(this, ...args);
  }
  Object.setPrototypeOf(ReadStream.prototype, fs.ReadStream.prototype);
  Object.setPrototypeOf(ReadStream, fs.ReadStream);

  ReadStream.prototype.open = common.mustCall(function ReadStream$open() {
    const that = this;
    fs.open(that.path, that.flags, that.mode, (err, fd) => {
      if (err) {
        if (that.autoClose)
          that.destroy();

        that.emit('error', err);
      } else {
        that.fd = fd;
        that.emit('open', fd);
        that.read();
      }
    });
  });

  const r = new ReadStream(fixtures.path('x.txt'))
    .on('open', common.mustCall((fd) => {
      assert.strictEqual(fd, r.fd);
      r.destroy();
    }));
}

{
  // Compat with graceful-fs.

  function WriteStream(...args) {
    fs.WriteStream.call(this, ...args);
  }
  Object.setPrototypeOf(WriteStream.prototype, fs.WriteStream.prototype);
  Object.setPrototypeOf(WriteStream, fs.WriteStream);

  WriteStream.prototype.open = common.mustCall(function WriteStream$open() {
    const that = this;
    fs.open(that.path, that.flags, that.mode, function(err, fd) {
      if (err) {
        that.destroy();
        that.emit('error', err);
      } else {
        that.fd = fd;
        that.emit('open', fd);
      }
    });
  });

  const w = new WriteStream(`${tmpdir.path}/dummy`)
    .on('open', common.mustCall((fd) => {
      assert.strictEqual(fd, w.fd);
      w.destroy();
    }));
}