CODEWITHSUNDEEP
node.jsmongodbloggingnode-mongodb-native
Alessandro
Alessandro

Reputation: 300

how to enable debug on node.js and mongoDB native driver?

i use node.js and node-mongodb-native driver, with connection pooling. is there any way to enable debug for see what's happening, how many connections are active and when a connection is opened or closed?

i would like to see something like:

* connection xxx opened on host:port
* connection yyy opened on host:port
* connection xxx closed

Upvotes: 6

Views: 7649

Answers (3)

xamgore
xamgore

Reputation: 1927

  1. To watch the commands been sent to MongoDB, set the driver logger's level to debug.
  2. To react to connection pool events, just subscribe to them and log yourself.
  3. You may need the topology monitoring to react to changes of topology, such as joins to a secondary or disconnections with a replica set.
const client = new MongoClient('mongodb://127.0.0.1:27017/', {
  useUnifiedTopology: true,
  loggerLevel: 'debug',
  // logger: (message, context) => console.dir(context),
})

// connection pool monitoring
client.on('connectionPoolCreated', event => console.dir(event))
client.on('connectionPoolClosed', event => console.dir(event))
client.on('connectionCreated', event => console.dir(event))
client.on('connectionReady', event => console.dir(event))
client.on('connectionClosed', event => console.dir(event))
client.on('connectionCheckOutStarted', event => console.dir(event))
client.on('connectionCheckOutFailed', event => console.dir(event))
client.on('connectionCheckedOut', event => console.dir(event))
client.on('connectionCheckedIn', event => console.dir(event))
client.on('connectionPoolCleared', event => console.dir(event))

// topology monitoring
client.on('serverDescriptionChanged', event => console.dir(event))
client.on('serverHeartbeatStarted', event => console.dir(event))
client.on('serverHeartbeatSucceeded', event => console.dir(event))
client.on('serverHeartbeatFailed', event => console.dir(event))
client.on('serverOpening', event => console.dir(event))
client.on('serverClosed', event => console.dir(event))
client.on('topologyOpening', event => console.dir(event))
client.on('topologyClosed', event => console.dir(event))
client.on('topologyDescriptionChanged', event => console.dir(event))

Upvotes: 4

Mendes
Mendes

Reputation: 18561

You can use the node's driver Logger class:

import { Logger } from "mongodriver";

And later in your code:

Logger.setLevel("debug");

You can check documentation on the official driver API doc

Upvotes: 1

jmikola
jmikola

Reputation: 6922

The Db() and Server() objects both support a logger option, which is an object with log, error and debug functions. The Db() option doesn't appear to be documented at the moment, but it is mentioned in the 0.9.6-20 2011-10-04 changelog entry.

I'm not sure if all of the information you need is supported with this interface, but it's definitely a good place to start. The driver team would also probably welcome a pull request to add such features.

Upvotes: 1

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