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// Tests serverStatus tracking of connections opened
var numPerTypeToCreate = 50;
// We need to create a new mongod to ensure no one else is talking to us in the background, and
// will screw up our stats.
var mongo = MongoRunner.runMongod({});
var db = mongo.getDB("test");
var availableConnections = db.serverStatus().connections.available;
if (availableConnections < (numPerTypeToCreate * 10)) {
numPerTypeToCreate = Math.floor(availableConnections / 10);
}
print("numPerTypeToCreate: " + numPerTypeToCreate);
var testDB = 'connectionsOpenedTest';
var signalCollection = 'keepRunning';
function createPersistentConnection() {
assert.soon(function() {
try {
permConns.push(new Mongo(db.getMongo().host));
return true;
} catch (x) {
return false;
}
}, "Timed out waiting for persistent connection to connect", 30000, 5000);
}
function createTemporaryConnection() {
// Retry connecting until you are successful
var pollString = "var conn = null;" +
"assert.soon(function() {" +
"try { conn = new Mongo(\"" + db.getMongo().host + "\"); return conn" +
"} catch (x) {return false;}}, " +
"\"Timed out waiting for temporary connection to connect\", 30000, 5000);";
// Poll the signal collection until it is told to terminate.
pollString += "assert.soon(function() {" +
"return conn.getDB('" + testDB + "').getCollection('" + signalCollection + "')" +
".findOne().stop;}, \"Parallel shell never told to terminate\", 10 * 60000);";
return startParallelShell(pollString, null, true);
}
function waitForConnections(expectedCurrentConnections, expectedTotalConnections) {
assert.soon(
function() {
var currentConnInfo = db.serverStatus().connections;
return (expectedCurrentConnections == currentConnInfo.current) &&
(expectedTotalConnections, currentConnInfo.totalCreated);
},
() => {
return "Incorrect connection numbers. Expected " + expectedCurrentConnections +
" current connections and " + expectedTotalConnections + " total" +
" connections. Connection info from serverStatus: " +
tojson(db.serverStatus().connections);
},
5 * 60000);
}
var originalConnInfo = db.serverStatus().connections;
assert.gt(originalConnInfo.current, 0);
assert.gt(originalConnInfo.totalCreated, 0);
jsTestLog("Creating persistent connections");
var permConns = [];
for (var i = 0; i < numPerTypeToCreate; i++) {
permConns.push(createPersistentConnection());
}
jsTestLog("Testing that persistent connections increased the current and totalCreated counters");
waitForConnections(originalConnInfo.current + numPerTypeToCreate,
originalConnInfo.totalCreated + numPerTypeToCreate);
jsTestLog("Creating temporary connections");
db.getSiblingDB(testDB).dropDatabase();
db.getSiblingDB(testDB).getCollection(signalCollection).insert({stop: false});
var tempConns = [];
for (var i = 0; i < numPerTypeToCreate; i++) {
tempConns.push(createTemporaryConnection());
}
jsTestLog("Testing that temporary connections increased the current and totalCreated counters");
waitForConnections(originalConnInfo.current + numPerTypeToCreate * 2,
originalConnInfo.totalCreated + numPerTypeToCreate * 2);
jsTestLog("Waiting for all temporary connections to be closed");
// Notify waiting parallel shells to terminate, causing the connection count to go back down.
db.getSiblingDB(testDB).getCollection(signalCollection).update({}, {$set: {stop: true}});
for (var i = 0; i < tempConns.length; i++) {
tempConns[i](); // wait on parallel shell to terminate
}
jsTestLog("Testing that current connections counter went down after temporary connections closed");
waitForConnections(originalConnInfo.current + numPerTypeToCreate,
originalConnInfo.totalCreated + numPerTypeToCreate * 2);
MongoRunner.stopMongod(mongo);
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