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tls: reduce TLS 'close' event listener warnings
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Without this, some heavy usage of TLS sockets can result in
MaxListenersExceededWarning firing, from the 'this.on('close', ...)'
line here.

These appear to come from reinitializeHandle, which calls _wrapHandle
repeatedly on the same socket instance.

PR-URL: #50136
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
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pimterry authored and targos committed Oct 23, 2023
1 parent 3e38001 commit ce27ee7
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Showing 2 changed files with 48 additions and 1 deletion.
7 changes: 6 additions & 1 deletion lib/_tls_wrap.js
Original file line number Diff line number Diff line change
Expand Up @@ -713,7 +713,12 @@ TLSSocket.prototype._wrapHandle = function(wrap, handle, wrapHasActiveWriteFromP
this[kRes] = res;
defineHandleReading(this, handle);

this.on('close', onSocketCloseDestroySSL);
// Guard against adding multiple listeners, as this method may be called
// repeatedly on the same socket by reinitializeHandle
if (this.listenerCount('close', onSocketCloseDestroySSL) === 0) {
this.on('close', onSocketCloseDestroySSL);
}

if (wrap) {
wrap.on('close', () => this.destroy());
}
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42 changes: 42 additions & 0 deletions test/parallel/test-tls-reinitialize-listeners.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,42 @@
// Flags: --expose-internals
'use strict';

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

if (!common.hasCrypto) {
common.skip('missing crypto');
}

const events = require('events');
const fixtures = require('../common/fixtures');
const tls = require('tls');
const { kReinitializeHandle } = require('internal/net');

// Test that repeated calls to kReinitializeHandle() do not result in repeatedly
// adding new listeners on the socket (i.e. no MaxListenersExceededWarnings)

process.on('warning', common.mustNotCall());

const server = tls.createServer({
key: fixtures.readKey('agent1-key.pem'),
cert: fixtures.readKey('agent1-cert.pem')
});

server.listen(0, common.mustCall(function() {
const socket = tls.connect({
port: this.address().port,
rejectUnauthorized: false
});

socket.on('secureConnect', common.mustCall(function() {
for (let i = 0; i < events.defaultMaxListeners + 1; i++) {
socket[kReinitializeHandle]();
}

socket.destroy();
}));

socket.on('close', function() {
server.close();
});
}));

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