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cluster: kill workers when master dies
This patch will kill the worker once it has lost its connection with the parent. However if the worker are doing a suicide, other measures will be used.
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// Copyright Joyent, Inc. and other Node contributors. | ||
// | ||
// Permission is hereby granted, free of charge, to any person obtaining a | ||
// copy of this software and associated documentation files (the | ||
// "Software"), to deal in the Software without restriction, including | ||
// without limitation the rights to use, copy, modify, merge, publish, | ||
// distribute, sublicense, and/or sell copies of the Software, and to permit | ||
// persons to whom the Software is furnished to do so, subject to the | ||
// following conditions: | ||
// | ||
// The above copyright notice and this permission notice shall be included | ||
// in all copies or substantial portions of the Software. | ||
// | ||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | ||
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN | ||
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, | ||
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | ||
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | ||
// USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
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var common = require('../common'); | ||
var assert = require('assert'); | ||
var cluster = require('cluster'); | ||
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if (cluster.isWorker) { | ||
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// keep the worker alive | ||
var http = require('http'); | ||
http.Server().listen(common.PORT, '127.0.0.1'); | ||
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} else if (process.argv[2] === 'cluster') { | ||
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var worker = cluster.fork(); | ||
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// send PID info to testcase process | ||
process.send({ | ||
pid: worker.process.pid | ||
}); | ||
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// terminate the cluster process | ||
worker.once('listening', function() { | ||
setTimeout(function() { | ||
process.exit(0); | ||
}, 1000); | ||
}); | ||
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} else { | ||
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// This is the testcase | ||
var fork = require('child_process').fork; | ||
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// is process alive helper | ||
var isAlive = function(pid) { | ||
try { | ||
//this will throw an error if the process is dead | ||
process.kill(pid, 0); | ||
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return true; | ||
} catch (e) { | ||
return false; | ||
} | ||
}; | ||
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// Spawn a cluster process | ||
var master = fork(process.argv[1], ['cluster']); | ||
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// get pid info | ||
var pid = null; | ||
master.once('message', function(data) { | ||
pid = data.pid; | ||
}); | ||
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// When master is dead | ||
var alive = true; | ||
master.on('exit', function(code) { | ||
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// make sure that the master died by purpose | ||
assert.equal(code, 0); | ||
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// check worker process status | ||
setTimeout(function() { | ||
alive = isAlive(pid); | ||
}, 200); | ||
}); | ||
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process.once('exit', function() { | ||
// cleanup: kill the worker if alive | ||
if (alive) { | ||
process.kill(pid); | ||
} | ||
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assert.equal(typeof pid, 'number', 'did not get worker pid info'); | ||
assert.equal(alive, false, 'worker was alive after master died'); | ||
}); | ||
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} |