How to run db.currentOp() using the MongoDB native Node.js driver?

Question

How to run db.currentOp() using the MongoDB native Node.js driver?

I can't seem to find a way of retrieving information on the database current operation using the mongodb module in Node.js.

I have tried something this:

mongodb   = require 'mongodb'
server    = new mongodb.Server 'localhost', 27017
connector = new mongodb.Db 'test', server

connector.open (err, db) ->
    if not err?
        db.admin().command {currentOp: 1}, (err, doc) ->
            if not err?
                console.log doc

of course without any result.

Does anybody have a pointer?

node.js
mongodb

Answer 1

The way to do this directly from node mongodb native driver:

var MongoClient = require('mongodb').MongoClient;

MongoClient.connect('mongodb://127.0.0.1:27017/', function (err, db) {

    if (err) { throw err; }

    db.collection('$cmd.sys.inprog').findOne(function (err, data) {

        if (err) { throw err; }
        console.log(data.inprog);

    });
});

Answer 2

Although it's a command on the shell, it is not a real command. Instead, you need to query the $cmd.sys.inprog collection with findOne(). On the MongoDB shell, you would do:

db.$cmd.sys.inprog.findOne();

Answer 3

This seems to work, disregarding the MongoDB native driver for Node.js.

exec = require('child_process').exec

exec '/usr/bin/mongo --quiet --host="localhost:27017" "test" --eval "printjson(db.currentOp())"', (err, stdout) ->
    console.error "#{err.message}" if err?

    console.log JSON.parse stdout

Shouldn't this feature be implemented in the driver?