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test: improve test-child-process-fork-dgram #8697

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test: improve test-child-process-fork-dgram #8697

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3 changes: 0 additions & 3 deletions test/parallel/parallel.status
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,3 @@ test-fs-watch-encoding : FAIL, PASS

#being worked under https://github.com/nodejs/node/issues/7973
test-stdio-closed : PASS, FLAKY

#covered by https://github.com/nodejs/node/issues/8271
test-child-process-fork-dgram : PASS, FLAKY
32 changes: 25 additions & 7 deletions test/parallel/test-child-process-fork-dgram.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8,9 +8,9 @@
* Because it's not really possible to predict how the messages will be
* distributed among the parent and the child processes, we keep sending
* messages until both the parent and the child received at least one
* message. The worst case scenario is when either one never receives
* a message. In this case the test runner will timeout after 60 secs
* and the test will fail.
* message. When either the parent or child receives a message we close
* the server on that side so the next message is guaranteed to be
* received by the other.
*/

const common = require('../common');
Expand All @@ -26,22 +26,30 @@ if (common.isWindows) {

var server;
if (process.argv[2] === 'child') {
var serverClosed = false;
process.on('message', function removeMe(msg, clusterServer) {
if (msg === 'server') {
server = clusterServer;

server.on('message', function() {
process.send('gotMessage');
// got a message so close the server to make sure
// the parent also gets a message
serverClosed = true;
server.close();
});

} else if (msg === 'stop') {
server.close();
process.removeListener('message', removeMe);
if (!serverClosed) {
server.close();
}
}
});

} else {
server = dgram.createSocket('udp4');
var serverPort = null;
var client = dgram.createSocket('udp4');
var child = fork(__filename, ['child']);

Expand All @@ -52,9 +60,13 @@ if (process.argv[2] === 'child') {

server.on('message', function(msg, rinfo) {
parentGotMessage = true;
// got a message so close the server to make sure
// the child also gets a message
server.close();
});

server.on('listening', function() {
serverPort = server.address().port;
child.send('server', server);

child.once('message', function(msg) {
Expand All @@ -66,13 +78,16 @@ if (process.argv[2] === 'child') {
sendMessages();
});

var iterations = 0;
var sendMessages = function() {
var timer = setInterval(function() {
iterations++;

client.send(
msg,
0,
msg.length,
server.address().port,
serverPort,
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Is there a reason to add the serverPort variable? It only seems to be used here, and makes things a bit more complicated.

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Its needed because the server is closed before we have stopped sending. Therefore, you can't call server.address().port. I found this the hard way while building up the changeset.

'127.0.0.1',
function(err) {
if (err) throw err;
Expand All @@ -83,7 +98,8 @@ if (process.argv[2] === 'child') {
* Both the parent and the child got at least one message,
* test passed, clean up everyting.
*/
if (parentGotMessage && childGotMessage) {
if ((parentGotMessage && childGotMessage) ||
((iterations / 1000) > 45)) {
clearInterval(timer);
shutdown();
}
Expand All @@ -94,7 +110,9 @@ if (process.argv[2] === 'child') {
var shutdown = function() {
child.send('stop');

server.close();
if (!parentGotMessage) {
server.close();
}
client.close();
};

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