test: harden test-dgram-bind-shared-ports

* add `mustCall` and `mustNotCall` to all callbacks
* added `known_issue` for port binding

PR-URL: nodejs#13100
Refs: nodejs#13055
Refs: nodejs#12999
Refs: nodejs#13526
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

test/known_issues/test-dgram-bind-shared-ports-after-port-0.js

@@ -0,0 +1,56 @@
+'use strict';
+const common = require('../common');
+
+// This test should fail because at present `cluster` does not know how to share
+// a socket when `worker1` binds with `port: 0`, and others try to bind to the
+// assigned port number from `worker1`
+//
+// *Note*: since this is a `known_issue` we try to swallow all errors except
+// the one we are interested in
+
+const assert = require('assert');
+const cluster = require('cluster');
+const dgram = require('dgram');
+const BYE = 'bye';
+
+if (cluster.isMaster) {
+  const worker1 = cluster.fork();
+
+  // verify that Windows doesn't support this scenario
+  worker1.on('error', (err) => {
+    if (err.code === 'ENOTSUP') throw err;
+  });
+
+  worker1.on('message', (msg) => {
+    if (typeof msg !== 'object') process.exit(0);
+    if (msg.message !== 'success') process.exit(0);
+    if (typeof msg.port1 !== 'number') process.exit(0);
+
+    const worker2 = cluster.fork({ PRT1: msg.port1 });
+    worker2.on('message', () => process.exit(0));
+    worker2.on('exit', (code, signal) => {
+      // this is the droid we are looking for
+      assert.strictEqual(code, 0);
+      assert.strictEqual(signal, null);
+    });
+
+    // cleanup anyway
+    process.on('exit', () => {
+      worker1.send(BYE);
+      worker2.send(BYE);
+    });
+  });
+  // end master code
+} else {
+  // worker code
+  process.on('message', (msg) => msg === BYE && process.exit(0));
+
+  // first worker will bind to '0', second will try the assigned port and fail
+  const PRT1 = process.env.PRT1 || 0;
+  const socket1 = dgram.createSocket('udp4', () => {});
+  socket1.on('error', PRT1 === 0 ? () => {} : assert.fail);
+  socket1.bind(
+    { address: common.localhostIPv4, port: PRT1, exclusive: false },
+    () => process.send({ message: 'success', port1: socket1.address().port })
+  );
+}

test/sequential/test-dgram-bind-shared-ports.js

@@ -1,56 +1,94 @@
 'use strict';
 const common = require('../common');
+
+// This test asserts the semantics of dgram::socket.bind({ exclusive })
+// when called from a cluster.Worker
+
 const assert = require('assert');
 const cluster = require('cluster');
 const dgram = require('dgram');
+const BYE = 'bye';
+const WORKER2_NAME = 'wrker2';
 
 function noop() { }
 
 if (cluster.isMaster) {
   const worker1 = cluster.fork();
 
   if (common.isWindows) {
-    const checkErrType = (er) => {
-      assert.strictEqual(er.code, 'ENOTSUP');
+    worker1.on('error', common.mustCall((err) => {
+      console.log(err);
+      assert.strictEqual(err.code, 'ENOTSUP');
       worker1.kill();
-    };
-
-    worker1.on('error', common.mustCall(checkErrType, 1));
+    }));
     return;
   }
 
-  worker1.on('message', (msg) => {
+  worker1.on('message', common.mustCall((msg) => {
+    console.log(msg);
     assert.strictEqual(msg, 'success');
-    const worker2 = cluster.fork();
 
-    worker2.on('message', (msg) => {
-      assert.strictEqual(msg, 'socket2:EADDRINUSE');
-      worker1.kill();
-      worker2.kill();
-    });
-  });
+    const worker2 = cluster.fork({ WORKER2_NAME });
+    worker2.on('message', common.mustCall((msg) => {
+      console.log(msg);
+      assert.strictEqual(msg, 'socket3:EADDRINUSE');
+
+      // finish test
+      worker1.send(BYE);
+      worker2.send(BYE);
+    }));
+    worker2.on('exit', common.mustCall((code, signal) => {
+      assert.strictEqual(signal, null);
+      assert.strictEqual(code, 0);
+    }));
+  }));
+  worker1.on('exit', common.mustCall((code, signal) => {
+    assert.strictEqual(signal, null);
+    assert.strictEqual(code, 0);
+  }));
+  // end master code
 } else {
-  const socket1 = dgram.createSocket('udp4', noop);
-  const socket2 = dgram.createSocket('udp4', noop);
-
-  socket1.on('error', (err) => {
-    // no errors expected
-    process.send(`socket1:${err.code}`);
-  });
-
-  socket2.on('error', (err) => {
-    // an error is expected on the second worker
-    process.send(`socket2:${err.code}`);
-  });
-
-  socket1.bind({
-    address: 'localhost',
-    port: common.PORT,
-    exclusive: false
-  }, () => {
-    socket2.bind({ port: common.PORT + 1, exclusive: true }, () => {
-      // the first worker should succeed
+  // worker code
+  process.on('message', common.mustCallAtLeast((msg) => {
+    if (msg === BYE) process.exit(0);
+  }), 1);
+
+  const isSecondWorker = process.env.WORKER2_NAME === WORKER2_NAME;
+  const socket1 = dgram.createSocket('udp4', common.mustNotCall());
+  const socket2 = dgram.createSocket('udp4', common.mustNotCall());
+  const socket3 = dgram.createSocket('udp4', common.mustNotCall());
+
+  socket1.on('error', (err) => assert.fail(err));
+  socket2.on('error', (err) => assert.fail(err));
+
+  // First worker should bind, second should err
+  const socket3OnBind =
+    isSecondWorker ?
+    common.mustNotCall() :
+    common.mustCall(() => {
+      const port3 = socket3.address().port;
+      assert.strictEqual(typeof port3, 'number');
       process.send('success');
     });
-  });
+  // an error is expected only in the second worker
+  const socket3OnError =
+    !isSecondWorker ?
+    common.mustNotCall() :
+    common.mustCall((err) => {
+      process.send(`socket3:${err.code}`);
+    });
+  const address = common.localhostIPv4;
+  const opt1 = { address, port: 0, exclusive: false };
+  const opt2 = { address, port: common.PORT, exclusive: false };
+  const opt3 = { address, port: common.PORT + 1, exclusive: true };
+  socket1.bind(opt1, common.mustCall(() => {
+    const port1 = socket1.address().port;
+    assert.strictEqual(typeof port1, 'number');
+    socket2.bind(opt2, common.mustCall(() => {
+      const port2 = socket2.address().port;
+      assert.strictEqual(typeof port2, 'number');
+      socket3.on('error', socket3OnError);
+      socket3.bind(opt3, socket3OnBind);
+    }));
+  }));
 }