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Storyboard DevTools

A library, plus a Chrome DevTools extension.

Demo: https://storyboard-bhibtchlhy.now.sh/ (might be a bit slow; free hosting!)

These are the docs for Storyboard v2.x. The latest docs for v1.x can be found here. See also the changelog for details on new features and breaking changes.

Why?

Installation

To add the Storyboard library to your project:

$ npm install --save storyboard

If you only need the CLI tool, see this section.

To install the Storyboard DevTools Chrome extension, get it from the Chrome Web Store. Optional, but highly recommended! After installing it, open the Storyboard pane in the Chrome DevTools and point your browser to a Storyboard-equipped page (see below for how to use the library).

Feel free to check out the example: just clone the repo and run npm install && npm start. You can also test-drive the PostgreSQL Database listener with npm run exampleWithDb, but make sure you run these SQL scripts before on your DB and customise the connection parameters.

CLI tool

Hopefully the next sections will convince you of the benefits of adding Storyboard to your project. If you don't want to modify your existing application but still want to use the Storyboard DevTools or other Storyboard features, you can use the sb CLI tool:

$ npm install -g storyboard
$ sb --server ls

2016-07-15T17:26:33.974Z           storyboard INFO  ┌── ROOT STORY [CREATED]
2016-07-15T17:26:33.975Z           storyboard INFO  Log filter: *:DEBUG
2016-07-15T17:26:34.151Z           storyboard INFO  Logs available via web on port 8090
2016-07-15T17:26:34.154Z                 main INFO  CHANGELOG.md
2016-07-15T17:26:34.155Z                 main INFO  LICENSE
2016-07-15T17:26:34.155Z                 main INFO  README.md
2016-07-15T17:26:34.155Z                 main INFO  ROADMAP.md
2016-07-15T17:26:34.155Z                 main INFO  chromeExtension
2016-07-15T17:26:34.155Z                 main INFO  coverage
...

You can pipe stdin and stdout in the standard way:

$ sb ls | head -n 3

2016-07-15T14:41:47.573Z           storyboard INFO  ┌── ROOT STORY [CREATED]
2016-07-15T14:41:47.574Z           storyboard INFO  Log filter: *:DEBUG
2016-07-15T14:41:47.601Z                 main INFO  CHANGELOG.md

$ ls | sb -- head -n 3

2016-07-15T14:41:52.174Z           storyboard INFO  ┌── ROOT STORY [CREATED]
2016-07-15T14:41:52.176Z           storyboard INFO  Log filter: *:DEBUG
2016-07-15T14:41:52.201Z                 main INFO  CHANGELOG.md
2016-07-15T14:41:52.201Z                 main INFO  LICENSE
2016-07-15T14:41:52.201Z                 main INFO  README.md
2016-07-15T14:41:52.202Z                 main INFO  
2016-07-15T14:41:52.203Z           storyboard INFO  └── ROOT STORY [CLOSED]

Note the use of the -- separator: options before the separator are passed to the sb tool; after the separator, they are passed to the called application.

Here are the CLI tool configuration options:

$ sb --help

  Usage: sb [options] <command> [args...]

  Options:

    -h, --help         output usage information
    -V, --version      output the version number
    --no-console       Disable console output
    --stderr           Enable stderr for errors
    --no-colors        Disable color output
    -f, --file <path>  Save logs to file
    -s, --server       Launch web server for logs
    -p, --port <port>  Port for web server

Storyboard library usage

Basic usage

import { mainStory, addListener } from 'storyboard';
import consoleListener from 'storyboard/lib/listeners/console';
addListener(consoleListener);

mainStory.info('Hello world!');

Note this breaking change in v2.x: As you can see above, Storyboard no longer enables listeners (plugins) by default, so you will need to do this manually upon startup.

Severity levels

mainStory.trace('Teeny-weeny detail: x = 3, y = 4');
mainStory.debug('Called login()');
mainStory.info('User "admin" authenticated successfully');
mainStory.warn('Sad we can\'t show colors in GFM');
mainStory.error('User "admin" could not be authenticated', { attach: err });
mainStory.fatal('Ooops! Crashed! Mayday!', { attach: fatalError });
// ...
// 2016-03-09T16:18:19.659Z           main WARN  Sad we can't show colors in GFM
// 2016-03-09T16:18:19.672Z           main ERROR User "admin" could not be authenticated
// 2016-03-09T16:18:19.672Z           main ERROR   name: 'Error'
// 2016-03-09T16:18:19.672Z           main ERROR   message: 'AUTHENTICATION_ERROR'
// 2016-03-09T16:18:19.672Z           main ERROR   stack: Error: AUTHENTICATION_ERROR
// 2016-03-09T16:18:19.672Z           main ERROR   stack:     at repl:3:11
// ...

Maybe you noticed that the trace call produces no output by default. See Log filtering to understand why.

Sources

Namespace your logs for readability, as well as to allow finer-grained filtering later on.

mainStory.info('http', 'GET /api/item/25');
mainStory.info('db', 'Fetching item 25...');
// 2016-03-09T16:29:51.943Z           http INFO  GET /api/item/25
// 2016-03-09T16:31:52.231Z             db INFO  Fetching item 25...

Colors

Use colors to highlight important parts of your logs:

import { mainStory, chalk } from 'storyboard';
mainStory.info('http', `GET ${chalk.green.bold('/api/item/26')}`);
mainStory.info('db', `Fetching item ${chalk.green.bold('26')}...`);
// 2016-03-09T16:29:51.943Z           http INFO  GET /api/item/26
// 2016-03-09T16:31:52.231Z             db INFO  Fetching item 26...

As seen above, we recommend using the popular chalk library by Sindre Sorhus. Chalk is automatically extended by Storyboard for use in the browser. If you prefer another ANSI-color library, make sure it's universal and doesn't disable itself in the browser.

Attachments

Attach anything to your logs that might provide additional context: an object, an array, an exception, a simple value... Don't worry about circular references, buffers, or undefined! Use the attach option to display it as a tree, or attachInline for a more compact, JSON.stringify-ed version.

You can also use the attachLevel option to control the (severity) level of the detailed object logs (by default: the same level of the main logged line). Pro tip: use the trace level for long attachments (hidden by default), so that they don't pollute your console but are still accessible via the Storyboard DevTools extension.

mainStory.info('test', 'A simple object', { attachInline: obj1 });
// 2016-03-09T16:51:16.436Z           test INFO  A simple object -- {"foo":2,"bar":3}
mainStory.info('test', 'An object with a circular reference', {
  attach: obj2,
  attachLevel: 'debug',
});
// 2016-03-09T16:52:48.882Z           test INFO  An object with a circular reference
// 2016-03-09T16:52:48.882Z           test DEBUG   foo: 2
// 2016-03-09T16:52:48.882Z           test DEBUG   bar: 3
// 2016-03-09T16:52:48.882Z           test DEBUG   circularRef: [CIRCULAR]

Note: attach and attachInline have no effect on the way attachments are shown in the Storyboard DevTools.

Log filtering

Inspired by the popular debug library, Storyboard allows you to filter logs according to source, specifying white and black lists and using wildcards. Beyond that, you can specify the minimum severity level you are interested in, depending on the source:

In Node, you can configure log filtering via the STORYBOARD environment variable (have a look at cross-env for a cross-platform setup):

# OS X / Linux
$ STORYBOARD=*:* node myScript

# Windows
$ set "STORYBOARD=*:*" && node myScript

In the browser, use localStorage:

localStorage.STORYBOARD = '*:*'

Alternatively, you can configure the log filters programatically:

import storyboard from 'storyboard';
storyboard.config({ filter: '*:*' });

And even more convenient: configure filters remotely and without reloading by using the Storyboard DevTools.

Children stories

Create child stories by calling child() on the parent story and passing an options argument. Don't forget to close() the child story when you're done with it! More on child stories here.

const story = mainStory.child({
  src: 'lib',
  title: 'Little Red Riding Hood',
  level: 'DEBUG',
});
story.info('Once upon a time...');
story.warn('...a wolf appeared!...');
story.info('...and they lived happily ever after.');
story.close();
// 2016-03-19T14:10:14.080Z        lib DEBUG ┌── Little Red Riding Hood [CREATED]
// 2016-03-19T14:10:14.083Z       main INFO  Once upon a time...
// 2016-03-19T14:10:14.085Z       main WARN  ...a wolf appeared!...
// 2016-03-19T14:10:14.087Z       main INFO  ...and they lived happily ever after.
// 2016-03-19T14:10:14.088Z        lib DEBUG └── Little Red Riding Hood [CLOSED]

Pro tip: Child stories have INFO level by default, and can be completely hidden by log filtering. However, when a log with level WARN or higher is added to a hidden story, the story and all of its ancestors will become visible. You will not miss any errors, nor the actions that led to them!

Listeners (plugins)

Logs emitted by stories are relayed by the Storyboard Hub to all attached listeners. A Hub exists at the core of every Storyboard instance. Here is an example of a typical configuration, with server and client-side Hubs (other use cases have proved possible in production):

Typical configuration

Several listeners come built-in (check out their configuration options, as well as the following sections):

More listeners can be added by the user (see the API), e.g. to support different databases, integrate with other services, etc. Get inspired by winston's and bunyan's plugins. PRs are welcome!

Remote access to server stories

Standalone log server

The simplest way to add remote access to a Node application's logs is to enable the WebSocket Server listener:

// Server
import { addListener } from 'storyboard';
import wsServerListener from 'storyboard/lib/listeners/wsServer';
addListener(wsServerListener);

You now have a standalone HTTP server at port 8090 (by default) and can use the Storyboard DevTools to see your logs.

Integrated log server

You can also integrate the log server functionality with your own application server. This may be desirable if you want to use a single port, or if you want to see end-to-end stories. In this case, your client application should enable the WebSocket Client and Browser Extension listeners:

// Client
import { addListener } from 'storyboard';
import wsClientListener from 'storyboard/lib/listeners/wsClient';
import browserExtListener from 'storyboard/lib/listeners/browserExtension';
addListener(wsClientListener);
addListener(browserExtListener);

At the server side, initialise the WebSocket Server listener with either your http Server instance, or your socket.io Server instance, depending on your case:

// If your application doesn't use WebSockets:
import express from 'express';
import http from 'http';
const httpServer = http.createServer(express());
httpServer.listen(3000);
addListener(wsServerListener, { httpServer });

// If your application uses socket.io WebSockets without socket auth:
import socketio from 'socket.io';
const socketServer = socketio(httpServer);
addListener(wsServerListener, { socketServer });

// If your application uses sockets with auth, namespace them
// so that they don't clash with the log server's:
// At the server...
const io = socketServer.of('/myApp');
io.use(myAuthMiddleware);
io.on('connection', myConnectFunction);
// ...and at the client:
const socket = socketio.connect('/myApp')

Now when you open your client-side application, you can see both server and client logs in the Storyboard DevTools.

User authentication

You can add prevent unauthorised access to your logs via a listener option:

addListener(wsServerListener, {
  authenticate: ({ login, password }) => isAuthorized(login, password),
});

Remote access to client stories

In some cases, you may want to remotely monitor client logs, e.g. if you are building a mobile web app, or you want to see the logs generated in non-Chrome browsers for which there is (currently) no browser extension.

For these cases, you can configure your WebSocket Client listener so that it uploads its logs to the server, which can then provide remote access to them:

import { addListener } from 'storyboard';
import wsClientListener from 'storyboard/lib/listeners/wsClient';
addListener(wsClientListener, { uploadClientStories: true });

Client logs will not pollute the server's own log, and will appear as a separate remote client story in the Storyboard DevTools, along with a short description of the remote platform:

Remote monitoring

End-to-end stories

The icing on the cake is linking server- and client-side stories to get a complete picture of what is triggered by a user action (see video at the top of this page).

Storyboard provides a simple yet flexible way to achieve this: stories can have multiple parents, which are specified upon creation. This feature is leveraged by the Storyboard DevTools: when it receives a new story from the server with multiple parents, it checks whether any of the parents is a client-side story. If so, it prioritises this parent for display purposes, since it is expected to provide more context.

For this to work, the client's storyId must be transmitted to the server somehow. This example uses the URL query string for simplicity, but feel free to use whatever technique you want (the body of a POST request, your own WebSocket messaging scheme, etc.):

// Client:
const story = mainStory.child({
  src: 'itemList',
  title: 'User click on Refresh',
});
story.info('itemList', 'Fetching items...');
fetch(`/items?storyId=${story.storyId}`)
.then(response => response.json())
.then(items => story.info('itemList', `Fetched ${items.length} items`))
.finally(() => story.close());  // using Bluebird's terse API

// Server (using Express):
import express from 'express';
const app = express();
app.get('/items', (req, res) => {
  const { storyId } = req.query;
  const story = mainStory.child({
    src: 'http',
    title: `HTTP request ${req.url}`,
    extraParents: storyId != null ? [storyId] : undefined,
  });
  story.info('http', 'Processing request...');
  // ...
  res.json(items);
  story.close();
});

Want to see the end-to-end story? Use the Storyboard DevTools extension.

Note: end-to-end stories work better when server and client system clocks are not too different. Servers are typically NTP-synchronised, as are most modern PCs with Internet access. If this is not the case, enable Storyboard 2.x's time synchronisation function:

import { addListener } from 'storyboard';
import wsClientListener from 'storyboard/lib/listeners/wsClient';
addListener(wsClientListener, { clockSync: true });

Storyboard DevTools

Storyboard DevTools

Enable the link to the browser extension in your application:

import { addListener } from 'storyboard';
import browserExtListener from 'storyboard/lib/listeners/browserExtension';
addListener(browserExtListener);

After installing the Chrome extension, open the Chrome DevTools, select the Storyboard pane and point your browser at either:

Some highlighted features:

You can check out your new extension navigating to: http://storyboard-demo.herokuapp.com/

Storyboard DevTools is built with React, Redux and Redux-Saga.

Changelog

License (MIT)

Copyright (c) Guillermo Grau Panea 2016

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.