mirror of https://github.com/lukechilds/node.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
58 lines
2.2 KiB
58 lines
2.2 KiB
'use strict';
|
|
const common = require('../common');
|
|
|
|
// subprocess.send() will return false if the channel has closed or when the
|
|
// backlog of unsent messages exceeds a threshold that makes it unwise to send
|
|
// more. Otherwise, the method returns true.
|
|
|
|
const assert = require('assert');
|
|
const net = require('net');
|
|
const { fork, spawn } = require('child_process');
|
|
const fixtures = require('../common/fixtures');
|
|
|
|
// Just a script that stays alive (does not listen to `process.on('message')`).
|
|
const subScript = fixtures.path('child-process-persistent.js');
|
|
|
|
{
|
|
// Test `send` return value on `fork` that opens and IPC by deafult.
|
|
const n = fork(subScript);
|
|
// `subprocess.send` should always return `true` for the first send.
|
|
const rv = n.send({ h: 'w' }, (err) => { if (err) assert.fail(err); });
|
|
assert.strictEqual(rv, true);
|
|
n.kill();
|
|
}
|
|
|
|
{
|
|
// Test `send` return value on `spawn` and saturate backlog with handles.
|
|
// Call `spawn` with options that open an IPC channel.
|
|
const spawnOptions = { stdio: ['pipe', 'pipe', 'pipe', 'ipc'] };
|
|
const s = spawn(process.execPath, [subScript], spawnOptions);
|
|
|
|
const server = net.createServer(common.mustNotCall()).listen(0, () => {
|
|
const handle = server._handle;
|
|
|
|
// Sending a handle and not giving the tickQueue time to acknoladge should
|
|
// create the internal backlog, but leave it empty.
|
|
const rv1 = s.send('one', handle, (err) => { if (err) assert.fail(err); });
|
|
assert.strictEqual(rv1, true);
|
|
// Since the first `send` included a handle (should be unackoladged),
|
|
// we can safly queue up only one more message.
|
|
const rv2 = s.send('two', (err) => { if (err) assert.fail(err); });
|
|
assert.strictEqual(rv2, true);
|
|
// The backlog should now be indicate to backoff.
|
|
const rv3 = s.send('three', (err) => { if (err) assert.fail(err); });
|
|
assert.strictEqual(rv3, false);
|
|
const rv4 = s.send('four', (err) => {
|
|
if (err) assert.fail(err);
|
|
// `send` queue should have been drained.
|
|
const rv5 = s.send('5', handle, (err) => { if (err) assert.fail(err); });
|
|
assert.strictEqual(rv5, true);
|
|
|
|
// End test and cleanup.
|
|
s.kill();
|
|
handle.close();
|
|
server.close();
|
|
});
|
|
assert.strictEqual(rv4, false);
|
|
});
|
|
}
|
|
|