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net: autoDestroy Socket #31806

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net: autoDestroy Socket #31806

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36 changes: 8 additions & 28 deletions lib/net.js
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Expand Up @@ -285,20 +285,15 @@ function Socket(options) {
else
options = { ...options };

const { allowHalfOpen } = options;

// Prevent the "no-half-open enforcer" from being inherited from `Duplex`.
options.allowHalfOpen = true;
// Default to *not* allowing half open sockets.
options.allowHalfOpen = Boolean(options.allowHalfOpen);
// For backwards compat do not emit close on destroy.
options.emitClose = false;
options.autoDestroy = false;
options.autoDestroy = true;
// Handle strings directly.
options.decodeStrings = false;
stream.Duplex.call(this, options);

// Default to *not* allowing half open sockets.
this.allowHalfOpen = Boolean(allowHalfOpen);

if (options.handle) {
this._handle = options.handle; // private
this[async_id_symbol] = getNewAsyncId(this._handle);
Expand Down Expand Up @@ -416,28 +411,18 @@ Socket.prototype._final = function(cb) {
const err = this._handle.shutdown(req);

if (err === 1 || err === UV_ENOTCONN) // synchronous finish
return afterShutdown.call(req, 0);
return cb();
else if (err !== 0)
return this.destroy(errnoException(err, 'shutdown'));
return cb(errnoException(err, 'shutdown'));
};


function afterShutdown(status) {
function afterShutdown() {
const self = this.handle[owner_symbol];

debug('afterShutdown destroyed=%j', self.destroyed,
self._readableState);

this.callback();

// Callback may come after call to destroy.
if (self.destroyed)
return;

if (!self.readable || self.readableEnded) {
debug('readableState ended, destroying');
self.destroy();
}
}

// Provide a better error message when we call end() as a result
Expand All @@ -452,10 +437,10 @@ function writeAfterFIN(chunk, encoding, cb) {
// eslint-disable-next-line no-restricted-syntax
const er = new Error('This socket has been ended by the other party');
er.code = 'EPIPE';
process.nextTick(emitErrorNT, this, er);
if (typeof cb === 'function') {
defaultTriggerAsyncIdScope(this[async_id_symbol], process.nextTick, cb, er);
}
this.destroy(er);

return false;
}
Expand Down Expand Up @@ -628,12 +613,7 @@ Socket.prototype.read = function(n) {
function onReadableStreamEnd() {
if (!this.allowHalfOpen) {
this.write = writeAfterFIN;
if (this.writable)
this.end();
else if (!this.writableLength)
this.destroy();
} else if (!this.destroyed && !this.writable && !this.writableLength)
this.destroy();
}
}


Expand Down
5 changes: 4 additions & 1 deletion test/parallel/test-http2-max-invalid-frames.js
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Expand Up @@ -23,7 +23,10 @@ server.on('stream', (stream) => {

server.listen(0, () => {
const h2header = Buffer.alloc(9);
const conn = net.connect(server.address().port);
const conn = net.connect({
port: server.address().port,
allowHalfOpen: true
});
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@lundibundi Could you take a look here? The readable side of the connection cleanly ends, cleanups the conn and thus never errors. Fix is to not destroy on 'end'. Does that somehow invalidate the test?

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Related to: #30505

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@ronag Sorry for the late response, I missed this one. I'm not sure I understand the reasons for this

The readable side of the connection cleanly ends, cleanups the conn and thus never errors

The server connection handler shouldn't be called as we are only sending 'close stream' packets (and never open a stream which is therefore invalid) and we don't .end \ .destroy the connection on the client-side. Something doesn't feel right here, not sure though.

As for the test itself, I think it will be fine either way and shouldn't be affected.

/cc @addaleax as the author of the original test (test-http2-reset-flood)

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I’m not sure I understand why this is necessary either, but I agree that the test functionality shouldn’t be affected – the important thing is that the .once('error') handler below fires.


conn.write('PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n');

Expand Down
11 changes: 6 additions & 5 deletions test/parallel/test-net-write-after-close.js
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Expand Up @@ -21,6 +21,7 @@

'use strict';
const common = require('../common');
const assert = require('assert');

const net = require('net');

Expand All @@ -31,10 +32,7 @@ const server = net.createServer(common.mustCall(function(socket) {

socket.resume();

socket.on('error', common.mustCall(function(error) {
console.error('received error as expected, closing server', error);
server.close();
}));
socket.on('error', common.mustNotCall());
}));

server.listen(0, function() {
Expand All @@ -44,7 +42,10 @@ server.listen(0, function() {
// Then 'end' will be emitted when it receives a FIN packet from
// the other side.
client.on('end', common.mustCall(() => {
serverSocket.write('test', common.mustCall());
serverSocket.write('test', common.mustCall((err) => {
assert(err);
server.close();
}));
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serverSocket has already been destroyed to further errors won't be propagated through 'error'.

}));
client.end();
});
Expand Down
3 changes: 2 additions & 1 deletion test/parallel/test-tls-getprotocol.js
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Expand Up @@ -34,7 +34,8 @@ const server = tls.createServer(serverConfig, common.mustCall(function() {
secureProtocol: v.secureProtocol
}, common.mustCall(function() {
assert.strictEqual(this.getProtocol(), v.version);
this.on('end', common.mustCall(function() {
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this.on('end', common.mustCall());
this.on('close', common.mustCall(function() {
assert.strictEqual(this.getProtocol(), null);
})).end();
if (++connected === clientConfigs.length)
Expand Down
5 changes: 2 additions & 3 deletions test/parallel/test-tls-streamwrap-buffersize.js
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Expand Up @@ -59,9 +59,8 @@ const net = require('net');
assert.strictEqual(client.bufferSize, i + 1);
}

// It seems that tlsSockets created from sockets of `Duplex` emit no
// "finish" events. We use "end" event instead.
client.on('end', common.mustCall(() => {
client.on('end', common.mustCall());
client.on('close', common.mustCall(() => {
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Same as https://github.com/nodejs/node/pull/31806/files#r381107810

assert.strictEqual(client.bufferSize, undefined);
}));

Expand Down