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