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Check if port/socket is available before forking in Streaming API (#9023)

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Previously, the server would attempt taking port/socket in worker
process, and if it was taken, fail, which made the master process
create a new worker. This led to really high CPU usage if the
streaming API was started when the port or socket were not
available.

Now, before clustering (forking) into worker processes, a test
server is created and then removed to check if it can be done.
This commit is contained in:
Eugen Rochko 2018-10-20 02:25:25 +02:00 committed by GitHub
parent eb1b9903a6
commit 369cc5f555
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 49 additions and 15 deletions
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52
streaming/index.js
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@ -74,6 +74,7 @@ const startMaster = () => {
if (!process.env.SOCKET && process.env.PORT && isNaN(+process.env.PORT)) {
log.warn('UNIX domain socket is now supported by using SOCKET. Please migrate from PORT hack.');
}
log.info(`Starting streaming API server master with ${numWorkers} workers`);
};
@ -616,16 +617,9 @@ const startWorker = (workerId) => {
});
}, 30000);
if (process.env.SOCKET || process.env.PORT && isNaN(+process.env.PORT)) {
server.listen(process.env.SOCKET || process.env.PORT, () => {
fs.chmodSync(server.address(), 0o666);
log.info(`Worker ${workerId} now listening on ${server.address()}`);
attachServerWithConfig(server, address => {
log.info(`Worker ${workerId} now listening on ${address}`);
});
} else {
server.listen(+process.env.PORT || 4000, process.env.BIND || '0.0.0.0', () => {
log.info(`Worker ${workerId} now listening on ${server.address().address}:${server.address().port}`);
});
}
const onExit = () => {
log.info(`Worker ${workerId} exiting, bye bye`);
@ -645,9 +639,49 @@ const startWorker = (workerId) => {
process.on('uncaughtException', onError);
};
const attachServerWithConfig = (server, onSuccess) => {
if (process.env.SOCKET || process.env.PORT && isNaN(+process.env.PORT)) {
server.listen(process.env.SOCKET || process.env.PORT, () => {
fs.chmodSync(server.address(), 0o666);
if (onSuccess) {
onSuccess(server.address());
}
});
} else {
server.listen(+process.env.PORT || 4000, process.env.BIND || '0.0.0.0', () => {
if (onSuccess) {
onSuccess(`${server.address().address}:${server.address().port}`);
}
});
}
};
const onPortAvailable = onSuccess => {
const testServer = http.createServer();
testServer.once('error', err => {
onSuccess(err);
});
testServer.once('listening', () => {
testServer.once('close', () => onSuccess());
testServer.close();
});
attachServerWithConfig(testServer);
};
onPortAvailable(err => {
if (err) {
log.error('Could not start server, the port or socket is in use');
return;
}
throng({
workers: numWorkers,
lifetime: Infinity,
start: startWorker,
master: startMaster,
});
});