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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<meta name="keywords" content="remark,remarkjs,markdown,slideshow,presentation" />
<meta name="description" content="A simple, in-browser, markdown-driven slideshow tool." />
<title>Quiver.js - A New Server-side Component Architecture</title>
<link rel="stylesheet" href="stylesheet.css" type="text/css" />
</head>
<body>
<textarea id="source">
name: inverse
layout: true
class: center, middle, inverse
---
#Quiver.js
A New Server-side Component Architecture
.footnote[By [Soares Chen](http://github.com/soareschen)]
---
layout: false
# Introduction to Quiver
.center[
]
- Component-based architecture
- Server-side applications
- Implemented in Node
---
# Coding in Quiver
.center[
]
- Code organized as small and reusable components
- Functions with standardized signatures
- JSON-like component definition
---
# Related Works
- Concepts and best practices other systems
- REST Architecture
- Unix Philosophy
- Functional Programming
---
# Architecture Overview
.center[
]
- Six layers of constructs
- Current focus: stream handler and filter
---
# Stream Handler
.center[
]
- Accept a key-value object `args`
- Accept a stream-like object `streamable`
- Asynchronously return a stream-like object
---
# Example Hello Handler
```javascript
var helloHandler = function(args, callback) {
callback(null, 'Hello World!')
}
exports.quiverComponents = [
{
name: 'demo hello handler',
type: 'simple handler',
inputType: 'void',
outputType: 'text',
handler: helloHandler
}
]
```
---
# Image Thumbnail Server
.left-column[
- Create a simple HTTP server
- Static image files
- Resize on the fly
- Quiver's approach
- Reuse existing components
- Code has no knowledge of image manipulation
]
.right-column[
]
---
# Step #1: Static File Server
.center[
]
- npm install `quiver-file-component`
- run `quiver file directory handler` component
---
# Quiver Server
- npm install -g `quiver-server`
- Wrapper tool to run a handler component as HTTP server
- Require a config.js or config.json file
```javascript
var path = require('path')
module.exports = {
dirPath: path.join(__dirname, 'static')
}
```
```bash
$ quiver-server . --config ./config.js --main \
'quiver file directory handler'
```
---
# Image Conversion
.center[
]
- Form a image conversion pipeline
- Second component: `resize image handler`
- Whole pipeline as component: `image thumbnail handler`
---
# ImageMagick
- Image conversion not done in JS
- Use ImageMagick's `convert` command
```bash
$ convert in.jpg -resize 200 out.jpg
```
- Doc: http://www.imagemagick.org/script/convert.php
---
# Command Handler
- npm install `quiver-command-component`
- Resize image handler extends from `file convert command handler`
- Generic handler for running any file conversion command
- Handler perform implicit conversion
1. Input stream to file
2. Execute Command
3. Output file to stream
---
# Command Args Extractor
.center[
<img src="images/command-args.png" style="width:50%">
]
- Handler need to know how to execute command
- Supply a `commandArgsExtractor` function to specify the command
---
# Image Convert Component
```javascript
{
name: 'demo resize image handler',
type: 'stream handler',
configOverride: {
commandArgsExtractor:
function(args, inFile, outFile) { ... },
},
resultContentType: 'image/jpeg',
handler: 'quiver file convert command handler'
}
```
- Customize existing component
- Supply custom configuration in `configOverride`
---
# Pipeline Component
```javascript
{
name: 'demo image thumbnail handler',
type: 'stream pipeline',
pipeline: [
'quiver file directory handler',
'demo resize image handler'
]
}
```
```bash
$ quiver-server . --config ./config.js --main \
'demo image thumbnail handler'
```
---
# Caching Resize Result
.center[
]
- One issue remain
- Pipeline executed repeatedly
- Quiver has no implicit optimization
- Filter is the general solution
- Extends existing handler
- Intercept original input/output
---
# Cache Filter
.center[
]
- Caching done outside the entire pipeline
- Result cached based on `args.path`
- Pipeline skipped if cached result available
---
# Final Thumbnail Component
```javascript
{
name: 'demo image thumbnail handler',
type: 'stream pipeline',
middlewares: [
'quiver memory cache filter'
],
pipeline: [
'quiver file directory handler',
'demo resize image handler'
]
}
```
- npm install `quiver-cache-component`
- 3 extra lines of code
- Filter is a subtype of middleware
---
# Component Reuse
.center[
]
- Advantage of Quiver
- Smaller components can be recombined and reused
- Components run on both server and command line
---
# Image Resize
- Resize command
```bash
$ quiver-command . --main 'demo resize image handler' \
< static/images/blue-hat.jpg > temp/out.jpg
```
- Resize server
```bash
$ quiver-server . --main 'demo resize image handler'
$ curl http://localhost:8080 -X POST \
--data-binary @static/images/blue-hat.jpg > temp/out.jpg
```
---
# Proxy Pipeline
.center[
]
- Horizontal scaling
---
# One Pattern, Unlimited Combination
- File + Image Resize + Memory Cache
- S3 + Audio Encode + Disk Cache
- Git + Compilation + CDN Cache
- Remote API + Template + Permission
---
name: inverse
class: center, middle, inverse
# Full Demo
http://github.com/quiverjs/demo/02-format-convert
---
# Preview of All Constructs
.center[
]
- True power of Quiver lies in more advanced constructs
- Quiver solves many other problems in web development
- Dependency management
---
# Thank you!
.center[
]
- Slide available at http://quiverjs.github.io/slides-01
- Quiver.js Homepage: http://quiverjs.org
</textarea>
<script src="remark-latest.min.js" type="text/javascript"></script>
<script type="text/javascript">
var hljs = remark.highlighter.engine;
</script>
<script type="text/javascript">
var slideshow = remark.create({
highlightStyle: 'monokai',
highlightLanguage: 'remark'
}) ;
</script>
</body>
</html>