node-statsd

A node.js client for Etsy's StatsD server.

This client will let you fire stats at your StatsD server from a node.js application.

node-statsd Runs and is tested on Node 0.6+ on all *nix platforms and 0.8+ on all platforms including Windows.


Installation

``
$ npm install node-statsd
`

Usage

All initialization parameters are optional.

Parameters (specified as an options hash):
* host: The host to send stats to default: localhost
* port: The port to send stats to default: 8125
* prefix: What to prefix each stat name with default: ''
* suffix: What to suffix each stat name with default: ''
* globalize: Expose this StatsD instance globally? default: false
cacheDns: Cache the initial dns lookup to host* default: false
* mock: Create a mock StatsD instance, sending no stats to the server? default: false
* global_tags: Optional tags that will be added to every metric default: []

All StatsD methods have the same API:
* name: Stat name required
* value: Stat value required except in increment/decrement where it defaults to 1/-1 respectively
* sampleRate: Sends only a sample of data to StatsD default: 1
* tags: The Array of tags to add to metrics default: []
* callback: The callback to execute once the metric has been sent

If an array is specified as the name parameter each item in that array will be sent along with the specified value.

`javascript
var StatsD = require('node-statsd'),
client = new StatsD();

// Timing: sends a timing command with the specified milliseconds
client.timing('response_time', 42);

// Increment: Increments a stat by a value (default is 1)
client.increment('my_counter');

// Decrement: Decrements a stat by a value (default is -1)
client.decrement('my_counter');

// Histogram: send data for histogram stat
client.histogram('my_histogram', 42);

// Gauge: Gauge a stat by a specified amount
client.gauge('my_gauge', 123.45);

// Set: Counts unique occurrences of a stat (alias of unique)
client.set('my_unique', 'foobar');
client.unique('my_unique', 'foobarbaz');

// Incrementing multiple items
client.increment(['these', 'are', 'different', 'stats']);

// Sampling, this will sample 25% of the time the StatsD Daemon will compensate for sampling
client.increment('my_counter', 1, 0.25);

// Tags, this will add user-defined tags to the data
client.histogram('my_histogram', 42, ['foo', 'bar']);

// Using the callback
client.set(['foo', 'bar'], 42, function(error, bytes){
//this only gets called once after all messages have been sent
if(error){
console.error('Oh noes! There was an error:', error);
} else {
console.log('Successfully sent', bytes, 'bytes');
}
});

// Sampling, tags and callback are optional and could be used in any combination
client.histogram('my_histogram', 42, 0.25); // 25% Sample Rate
client.histogram('my_histogram', 42, ['tag']); // User-defined tag
client.histogram('my_histogram', 42, next); // Callback
client.histogram('my_histogram', 42, 0.25, ['tag']);
client.histogram('my_histogram', 42, 0.25, next);
client.histogram('my_histogram', 42, ['tag'], next);
client.histogram('my_histogram', 42, 0.25, ['tag'], next);
`

Errors

In the event that there is a socket error, node-statsd will allow this error to bubble up. If you would like to catch the errors, just attach a listener to the socket property on the instance.

`javascript
client.socket.on('error', function(error) {
return console.error("Error in socket: ", error);
});
``

If you want to catch errors in sending a message then use the callback provided.

License

node-statsd is licensed under the MIT license.