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// Flags: --expose-internals
'use strict';
const common = require('../common');
const assert = require('assert');
const dgram = require('dgram');
const dns = require('dns');
const { kStateSymbol } = require('internal/dgram');
// Monkey patch dns.lookup() so that it always fails.
dns.lookup = function(address, family, callback) {
process.nextTick(() => { callback(new Error('fake DNS')); });
};
const socket = dgram.createSocket('udp4');
let dnsFailures = 0;
let sendFailures = 0;
process.on('exit', () => {
assert.strictEqual(dnsFailures, 3);
assert.strictEqual(sendFailures, 3);
});
socket.on('error', (err) => {
if (/^Error: fake DNS$/.test(err)) {
// The DNS lookup should fail since it is monkey patched. At that point in
// time, the send queue should be populated with the send() operation. There
// should also be two listeners - this function and the dgram internal one
// time error handler.
dnsFailures++;
assert(Array.isArray(socket[kStateSymbol].queue));
assert.strictEqual(socket[kStateSymbol].queue.length, 1);
assert.strictEqual(socket.listenerCount('error'), 2);
return;
}
if (err.code === 'ERR_SOCKET_CANNOT_SEND') {
// On error, the queue should be destroyed and this function should be
// the only listener.
sendFailures++;
assert.strictEqual(socket[kStateSymbol].queue, undefined);
assert.strictEqual(socket.listenerCount('error'), 1);
return;
}
assert.fail(`Unexpected error: ${err}`);
});
// Initiate a few send() operations, which will fail.
socket.send('foobar', common.PORT, 'localhost');
process.nextTick(() => {
socket.send('foobar', common.PORT, 'localhost');
});
setImmediate(() => {
socket.send('foobar', common.PORT, 'localhost');
});
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