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'use strict';
const common = require('../common');
const assert = require('assert');
const fs = require('fs').promises;
const vm = require('vm');
const { MessageChannel, moveMessagePortToContext } = require('worker_threads');
const { once } = require('events');
(async function() {
const fh = await fs.open(__filename);
const { port1, port2 } = new MessageChannel();
assert.throws(() => {
port1.postMessage(fh);
}, {
// See the TODO about error code in node_messaging.cc.
code: 'ERR_MISSING_MESSAGE_PORT_IN_TRANSFER_LIST'
});
// Check that transferring FileHandle instances works.
assert.notStrictEqual(fh.fd, -1);
port1.postMessage(fh, [ fh ]);
assert.strictEqual(fh.fd, -1);
const [ fh2 ] = await once(port2, 'message');
assert.strictEqual(Object.getPrototypeOf(fh2), Object.getPrototypeOf(fh));
assert.deepStrictEqual(await fh2.readFile(), await fs.readFile(__filename));
await fh2.close();
assert.rejects(() => fh.readFile(), { code: 'EBADF' });
})().then(common.mustCall());
(async function() {
// Check that there is no crash if the message is never read.
const fh = await fs.open(__filename);
const { port1 } = new MessageChannel();
assert.notStrictEqual(fh.fd, -1);
port1.postMessage(fh, [ fh ]);
assert.strictEqual(fh.fd, -1);
})().then(common.mustCall());
(async function() {
// Check that in the case of a context mismatch the message is discarded.
const fh = await fs.open(__filename);
const { port1, port2 } = new MessageChannel();
const ctx = vm.createContext();
const port2moved = moveMessagePortToContext(port2, ctx);
port2moved.onmessage = common.mustCall((msgEvent) => {
assert.strictEqual(msgEvent.data, 'second message');
port1.close();
});
// TODO(addaleax): Switch this to a 'messageerror' event once MessagePort
// implements EventTarget fully and in a cross-context manner.
port2moved.emit = common.mustCall((name, err) => {
assert.strictEqual(name, 'messageerror');
assert.strictEqual(err.code, 'ERR_MESSAGE_TARGET_CONTEXT_UNAVAILABLE');
});
port2moved.start();
assert.notStrictEqual(fh.fd, -1);
port1.postMessage(fh, [ fh ]);
assert.strictEqual(fh.fd, -1);
port1.postMessage('second message');
})().then(common.mustCall());
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