I have a one-shot Node script that makes some changes to a MongoDB database on MongoLab. However, once it finishes, it never exits the event loop (I always have to ctrl+C it), no matter how much db.close() and db.logout() calling I do.
What's strange is, if I start a local running instance of mongod and connect to that, the script finishes fine, but the remote connection just never ends.
Here is a short version of my script that still has the issue (taking the URL to the server on the command line). What's going on?
var mongodb = require("mongodb");
function onSuccess(cb){
return function(err) {
if (err) {
console.error(err)
} else {
cb.apply(this,Array.prototype.slice.call(arguments,1))
}
}
}
console.log("Connecting to "+process.argv[2]+' ...');
mongodb.MongoClient.connect(process.argv[2],onSuccess(function(db){
console.log("Connected.");
db.logout(onSuccess(function(logoutResult){
db.close(onSuccess(function(closeResult){
console.log("All finished. Can has prompt return nao?")
}));
}));
}));
I suspect it has to do with the way you have defined your closures but I cannot quite put my finger on it.
For what is worth, below is the approach that I use and this does close the connection as expected:
MongoClient.connect(dbUrl, function(err, db) {
if(err) return callback(err);
var collection = db.collection(dbCollection);
collection.find().toArray(function(err, items){
db.close()
if(err) return callback(err);
callback(null, items);
});
});
You can find a full example here: https://github.com/hectorcorrea/mongoDbSample
Just tried the code with driver version 1.2.7/1.2.8 and the newest 1.2.9 against mongolab and it works correctly. So more likely its a weird combination of driver/os/node version that's causing this. I suggest upgrade your node and driver to the latest version and try again.