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

@advinans/plack

v5.2.1

Published

Pino-based Stackdriver logger with pretty print utility

Downloads

219

Readme

fluentd-gcp compatible Stackdriver logging for node

Logs from applications running in a Kubernetes cluster are automatically picked up a fluentd daemon set if Stackdriver logging is enabled. By formatting these logs as JSON objects, proper Stackdriver LogEntry objects are created, including HttpRequest properties and severity levels.

This is a small library to log JSON log entries in this format, based on pino. Pino uses the Bunyan log format, but with some small tweaks we can make it talk Stackdriver. It maps pino log levels to Stackdriver severity levels, and adds notice, alert and emergency severities.

The fluentd instance (as of 2018-01-18) does not convert all fields in the JSON payload to LogEntry fields. See below for information about what gets picked up. This project defines an interface for log entries with these fields.

Also included is a pretty printer for local development called plack. You can pipe log output through this utility. It doesn't have a lot of configuration.

$ node my-program.js | plack
[2018-02-28T13:43:23+01:00] INFO server up and listening on port 8080
[2018-02-28T13:43:23+01:00] INFO Updated user account
    userAccountId: "6fba0a63-f544-4cd8-becd-08e30dc47831"
[2018-02-28T13:43:23+01:00] INFO
    GET http://example.com/some/info?color=red
      requestSize: "3000"
      status: 200
      responseSize: "1000"
      userAgent: "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98; Q312461; .NET CLR 1.0.3705)"
      remoteIp: "192.168.1.1"
      referer: "http://example.com/refererr"
      latency: "3.5s"

    field: "value"
[2018-02-28T13:43:23+01:00] ERROR
    MyError: Custom error
        at Object.<anonymous> (/Users/victor/code/advinans/@advinans--plack/examples/sample.ts:45:11)
        at Module._compile (module.js:660:30)
        at Object.Module._extensions..js (module.js:671:10)
        at Module.load (module.js:573:32)
        at tryModuleLoad (module.js:513:12)
        at Function.Module._load (module.js:505:3)
        at Function.Module.runMain (module.js:701:10)
        at startup (bootstrap_node.js:194:16)
        at bootstrap_node.js:618:3

    serviceContext: {
      "service": "plack-use",
      "version": "1.0.1"
    }
    name: "MyError"

Usage

Unless you provide a level to the plack constructor, it will respect process.env.LOG_LEVEL. This allows you to configure the log level through the environment, by default.

Basic usage

import plack from '@advinans/plack';

// Accepts standard pino configuration, but you shouldn't have to configure
// it at all
const log = plack();

log.info('hello world');
log.alert('red alert!');

Errors

import { VError } from 'verror';

// You can pass an explicit service context, but a default one is inferred
// based on your package.json (`.name`) and environment if not provided.
// We read `process.env.VERSION` from the environment, because we don't bump
// package.json versions (for Docker layering purposes)
const log = plack();

// The stack trace gets logged so that the error gets picked up by Stackdriver
// error reporting. It uses `VError.fullstack` to report a 'full" stack trace.
log.error(new Error('an error'));

// To provide additional context about an error that you wish to be reported
// as an error in Stackdriver, send an additional object. Enumerable error
// properties are also reported.
log.error(
  { context: { httpRequest: { method: 'GET', responseStatusCode: 500 } } },
  new Error('another error'),
);

// You *should* create custom error classes to improve error grouping in
// Stackdriver. You *must* set `this.name = this.constructor.name` in order
// for the stack trace to include the name of your custom error class.
class MyError extends Error {
  constructor(message?: string) {
    super(message);

    this.name = this.constructor.name;
  }
}

log.error(new MyError('My little error'));
log.error(
  new VError({ cause: new MyError('root cause'), name: 'RequestError' }),
  'The request failed',
);

Operations

Stackdriver supports logging long-running operations (LogEntryOperation). You can explicitly log such objects under the LOGGING_OPERATION key, or you can create a child logger:

const log = plack();

const op1 = log.operation({
  // An arbitrary producer identifier. The combination of id and
  // producer must be globally unique.
  producer: 'advinans/service-company/my-producer',

  // An arbitrary operation identifier. Log entries with the same
  // identifier are assumed to be part of the same operation.
  id: 'jobs-processor-8eb41c3d-3998-4360-9ea7-0132642e2d38',
});

op1.info({ first: true }, 'Operation starts');
op1.info('Operation runs');
op1.info({ last: true }, 'Operation ends');

Note: This uses pino's child bindings to create the initial operation key. Such bindings cannot be removed, so when logging first or last the logging key is repeated in the JSON output. This may cause problems for some JSON parsers but Stackdriver handles it gracefully (last value wins).

What gets picked up

The fluentd daemon set translates JSON payloads to StackDriver entries using a plugin called fluentd-plugin-google-cloud. Which fields get picked up can be figured out from the source code for this plugin (github.com/GoogleCloudPlatform/fluent-plugin-google). time is stripped from the payload, but it seems like Stackdriver ignores any timestamp set.

Here's some sample code illustrating sending rich log entries:

import plack from '@advinans/plack';

const log = plack.plack();
log.info(
  {
    httpRequest: {
      requestMethod: 'GET',
      requestUrl: 'https://localhost:8080',
      requestSize: '2048',
      status: 400,
      responseSize: '1024',
      userAgent:
        'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36',
      remoteIp: '128.23.12.1',
      referer: 'https://google.com',
      cacheHit: false,
      cacheValidatedWithOriginServer: false,
      latency: '3s',
    },
    'logging.googleapis.com/sourceLocation': {
      file: 'index.js',
      function: 'main',
      line: '12',
    },
  },
  'access',
);

log.info(
  {
    'logging.googleapis.com/operation': {
      id: '9bf48d24-cd65-4699-9d2f-2c42bcc08437',
      producer: 'main-producer',
      first: true,
    },
  },
  'start of operation',
);

log.info(
  {
    'logging.googleapis.com/operation': {
      id: '9bf48d24-cd65-4699-9d2f-2c42bcc08437',
      producer: 'main-producer',
    },
  },
  'middle of operation',
);

log.info(
  {
    'logging.googleapis.com/operation': {
      id: '9bf48d24-cd65-4699-9d2f-2c42bcc08437',
      producer: 'main-producer',
      last: true,
    },
  },
  'end of operation',
);