npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

uber-larch

v1.4.0

Published

reservoir sampled logger

Downloads

4

Readme

Larch

It's a logging framework. Currently it's main use is to reservoir sample logs and forward them to Logtron. In the long term, it may replace Logtron. It can be used like this:

var Logtron = require('logtron');

var ReservoirBackend = require('larch/reservoir-backend');
var LevelRouterBackend = require('larch/level-router-backend');
var DropBackend = require('larch/drop-backend');

var logtronLogger = Logtron({...});

var reservoir = ReservoirBackend({
    backend: LogtronBackend(logtronLogger),
    statsd: options.statsd
});

// debug logs sent to drop backend; rest of logs are reservoir sampled
// then sent to Logtron
var levelRouterBackend = LevelRouterBackend({
    backends: {
        debug: DropBackend(),
        default: reservoir
    }
});

var logger = LarchLogger({
    backends: [levelRouterBackend],
    statsd: options.statsd
});

logger.warn('warn string', {meta: 'object'});

Using willSample($level, $msg)

The top level Larch object, as well as each backend, has a method willSample. This method returns true if any backend after this backend in the object tree is interested in taking a log with level $level. This can be used to avoid allocating space for large meta objects, like so:

if (larch.willSample('warn', 'thing failed!')) {
    larch.swarn('thing failed!', {
        count: this.count,
        length: this.length,
        largeArrayOfThings: this.bigArray,
        hugeAmountOfUsefulDebuggingInfo: this.stuff
    });
}

This way, we can do less work when we have a lot of logs because we don't have to allocate the large meta object.

Regular log methods (.log, .error, etc) will first compute a sampling decision. Log methods prefixed with an s (.slog, .serror, etc) will use a previously computed sampling decision. Calling an s method without first calling .willSample($level, $msg) will throw.

Contributors

License

MIT.