MONGO DB FOR CAT LOVERS

About me• Developer / Entrepreneur

• Co-Founder / CTO at PicoCandy Singapore and MogiMe Inc, San Francisco :)

What do you do as an entrepreneur?

You think of ideas

You see funny cats pics at work

Sometimes you get bored and google for funny cats at

work

And when you suddenly thought of this awesome idea,

you can’t sleep

What if !!??!!User Generated Funny Cat

Pics and Videos!

Shot using their mobile phone camera!

Using the Catstagram app!

MVP Development 101

• Wrote ruby server code

• Wrote iOS code

• Wrote ruby server code

• Wrote iOS code

Problem

How to do file upload on mobile?

Why File Upload for mobile sucks*

Why File Upload for mobile sucks*

Why File Upload for mobile sucks*

SUCKY SG MOBILE NETWORK

How to make file upload RESUMABLE for mobile?

Then you google like every developer should*

TUS.IO a resumable file upload protocol on top of HTTP

What is the TUS protocol?

• Simple, open and free

• HTTP-based ( POST, HEAD, PATCH )

• Split file into chunks

• Send smaller pieces, server keeps track of chunks / offset

• Web and mobile clients library

What is the TUS protocol?

POST "/files" HTTP/1.1Host: tus.example.orgContent-Length: 0Final-Length: 100

RESPONSE:

HTTP/1.1 201 CreatedLocation: http://tus.example.org/files/1

What is the TUS protocol?

PATCH "/files/1" HTTP/1.1Host: tus.example.orgContent-Length: 70Offset: 0[file data]

RESPONSE:

HTTP/1.1 200 Ok

What is the TUS protocol?

HEAD "/files/1" HTTP/1.1Host: tus.example.org

RESPONSE:

HTTP/1.1 200 OkOffset: 70

What is the TUS protocol?

PATCH "/files/1" HTTP/1.1Host: tus.example.orgContent-Length: 30Offset: 70

[remaining file data]

RESPONSE:

HTTP/1.1 200 Ok

Awesome! What about the servers and the

clients?• tusd - reference server implementation

using Go

• tus-ios-client, native objective-C client library

• tus-jquery, javascript client library

• rubytus, ruby gemhttps://github.com/picocandy/rubytus

Where are the chunks?

• tusd - reference server implementation using Go

• tus-ios-client, native objective-C client library

• tus-jquery, javascript client library

• rubytus, ruby gemhttps://github.com/picocandy/rubytus

Where are the chunks? Take 2.

What is GridFS?

• GridFS is a specification for storing and retrieving files that exceed the BSON-document size limit of 16MB.

• Just like the other collections

• By default, GridFS uses two collections with names prefixed by fs bucket:

• fs.files and fs.chunks

• Use a different bucket name? Yes!Create multiple buckets in a single database? Oh yes!

What is GridFS?

{

"_id" : <ObjectId>,

"length" : <num>,

"chunkSize" : <num>

"uploadDate" : <timestamp>

"md5" : <hash>

"filename" : <string>,

"contentType" : <string>,

"aliases" : <string array>,

"metadata" : <dataObject>,

}

The files Collection - fs.files

What is GridFS?

{

"_id" : <ObjectId>,

"files_id" : <ObjectId>,

"n" : <num>,

"data" : <binary>

}

The chunks Collection - fs.chunks

Mongo Ruby Driverrequire 'mongo'include Mongo

@db = MongoClient.new('localhost').db('picotusd')@grid = Grid.new(@db)

Saving Fileimage = File.open(“cat.jpg")

id_for_cat = @grid.put(image, :filename => “cat.jpg")

Retrieving Filethe_first_cat_image = @grid.get(id_for_cat)

Demo / Code

Questions?