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