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cluster: sometimes debug-port value for child process can be broken #1524

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cd23c88
cluster: sometimes debug-port value for child process can be broken
Olegas Apr 25, 2015
e71cfc8
Test added
Olegas Apr 27, 2015
2a8c5e7
Fixed coding style issues
Olegas Apr 27, 2015
5ee069b
Fixed coding style issues
Olegas Apr 27, 2015
4aa3f47
Rewrite from scratch. Debug port numbers must be consecutive.
Olegas Apr 27, 2015
220e3d3
Missing semicolon
Olegas Apr 27, 2015
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cluster: sometimes debug-port value for child process can be broken 
In case of long running cluster, if worker processes is restarting
periodically, --debug-port value may become out of range [1024, 65535].
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@Olegas
Olegas committed Apr 25, 2015
commit cd23c8850b19468235459ea6ca968b75d0c46da2
3 changes: 2 additions & 1 deletion lib/cluster.js
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Expand Up @@ -17,6 +17,7 @@ cluster.Worker = Worker;
cluster.isWorker = ('NODE_UNIQUE_ID' in process.env);
cluster.isMaster = (cluster.isWorker === false);

const debugPortRange = (65536 - 1024);

function Worker(options) {
if (!(this instanceof Worker))
Expand Down Expand Up @@ -282,7 +283,7 @@ function masterInit() {
function createWorkerProcess(id, env) {
var workerEnv = util._extend({}, process.env);
var execArgv = cluster.settings.execArgv.slice();
var debugPort = process.debugPort + id;
var debugPort = (process.debugPort + id) % debugPortRange + 1024;
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@bnoordhuis bnoordhuis Apr 27, 2015

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It would be a little neater to turn the number literal into a constant and use it in the range calculation above.

Aside, it's something of a (not consistently enforced) convention to name constants kFoo, i.e.:

const kDebugPortStart = 1024;
const kDebugPortRange = (65536 - kDebugPortStart);

var hasDebugArg = false;

workerEnv = util._extend(workerEnv, env);
Expand Down