MongoSF 2012

© 2012 VMware, Inc. All rights reserved

Activity Streams on Cloud Foundry with MongoDB and Node.jsMongoSF - 2012

By Monica Wilkinson

Friday, May 4, 12

CONFIDENTIAL

About Monica Wilkinson

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Loves the web and data portability.

Developer Advocate @ Cloud Foundry12 years development experience.

Last 5 years in Social WebOpen Web Standards Advocate

Contact Me: @[email protected]

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mailto:[email protected]

mailto:[email protected]

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Agenda

1.Overview of Cloud Foundry2.What is Activity Streams ?3.Building an Activity Stream Engine

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CONFIDENTIAL

About Cloud Foundry

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The first Open PaaS

Multi(n) Languages, Frameworks, Services & Clouds

Open Source

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Deploy and scale applications in seconds, without locking yourself

Simple, Open,

Flexible, Scalable

The Open Platform as a Service

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Cloud Foundry open PaaS - Choice of frameworks

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Cloud Foundry open PaaS - Choice of frameworks

OSS community

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Applica'on Service Interface

Data Services

Other Services

Msg Services

Cloud Foundry open PaaS - Choice of application services

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Data Services

Other Services

Msg Services

Cloud Foundry open PaaS - Choice of application services

vFabric Postgres

vFabric RabbitMQTM

Additional partners services …

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Data Services

Other Services

Msg Services

Cloud Foundry open PaaS - Choice of clouds

Private Clouds

PublicClouds

MicroClouds

Cloud Provide

r Interface

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Data Services

Other Services

Msg Services

Cloud Foundry open PaaS - Choice of clouds

Private Clouds

PublicClouds

MicroClouds

Cloud Provide

r Interface

Avoid

Lock-in

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Multi-cloud flexibility is critical to your long-term success

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§ Make use of both public and private clouds without rewriting your applications

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§ Protect against vendor lock-in

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§ Meet different compliance and geographical needs

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§ Accommodate peak loads while optimizing costs

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§ Accommodate peak loads while optimizing costs

§ Manage your growth and changing needs over time

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CloudFoundry.COM - Multi-tenant PaaS operated by VMware

Runtimes & Frameworks

Services

vCenter / vSphere

CloudFoundry.COM (beta)

Infrastructure

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Micro Cloud FoundryTM – Industry first downloadable PaaS

Runtimes & Frameworks

Services

Your Laptop/PC

Micro Cloud Foundry

Single VM instance of Cloud Foundry that runs on a developer’s MAC or PC

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CloudFoundry.ORG - Community open-source project

CloudFoundry.ORG

DownloadCode

Setup Environment

Deploy Behind Firewall

Setup Scripts

Apache2 license

Your Infrastructure

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Cloud Foundry: you can trade-off effort vs flexibility

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Public PaaS

Private PaaS

Custom Private PaaS

Less

More

Less

More

.COM....

....

git clone git://github.com/cloudfoundry/

Effort Flexibility

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Why PaaS Matters

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Container (e.g. Tomcat)

Traditional web application architecture

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Desktop Browser

Apache

Web Application

MySQL Database

developtestdeployscale

ShippingService

AccountingService

InventoryService

StoreFront

Simple to

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Container (e.g. Tomcat)

Traditional web application architecture

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Desktop Browser

Apache

Web Application

MySQL Database

developtestdeployscale Or is it?

ShippingService

AccountingService

InventoryService

StoreFront

Simple to

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?Let’s imagine you want to run a performance test...

How long to get the servers?Who is going to set up the servers?Who is going to set up Apache, Tomcat, and MySQL?

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And things are changing:

This simple, monolithic architecture is inadequate

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Smart phones overtake PCs in Q4 2010

New kinds of clients

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Users expect a rich, dynamic and interactive experience on mobile devices and desktop

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Web ApplicationDesktop Browser

HTTP Request

HTML/Javascript

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Users expect a rich, dynamic and interactive experience on mobile devices and desktop

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Web ApplicationDesktop Browser

HTTP Request

HTML/Javascript

Old style UI architecture isn’t good enough

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Need to handle massive loads and the data explosion

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Need scalable architectures

§ Application tier:•Replicated/clustered servers•Modular so that components can be scaled differently•Asynchronous architecture - communication via a message

broker§ Database tier:•Replication•Sharding•Polyglot persistence: Relational, NoSQL, NewSQL

databases

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Scaling development

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§ Strongly coupled components makes development difficult

§ Forces multiple developers/teams to synchronize development efforts

§ Obstacle to frequent, independent deployments

§ Increases risk of failure - need to redeploy everything to change one thing

!=Scalable development

Web application

ShippingService

AccountingService

InventoryService

StoreFront

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Desktop Browser

NodeJS front-end application

Native Mobile Application

HTML5 mobile application

RabbitMQ

NodeJS

MySQL

Mongo

Redis

ShippingService

AccountingService

billing web application

shipping web application

InventoryService

inventory web application

StoreUI

StoreUI

StoreUI

StoreUI

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Modern application architecture

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Developing and testing these applications is even more challenging

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Let’s imagine you are fixing a bug and want to run some JUnit integration tests...

Who is going to setup your sandbox: MySQL, RabbitMQ, MongoDB, ....??

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Let’s imagine you have fixed a bug and want to run some functional tests...

How long to purchase the servers?Who is going to set up the servers?Who is going to setup MySQL, RabbitMQ, MongoDB, ....??

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Platform-as-a-Service is the solution

Easy deployment

Application management

Easy scaling up and down

+SQL databases

NoSQL databases

Message Broker

Deployment Services

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Getting Started on Cloud Foundry

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STEP 1 - Get a Cloud Foundry Account

§ https://my.cloudfoundry.com/signup/hack

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http://cloudfoundry.com/signup


https://my.cloudfoundry.com/signup/HACK

https://my.cloudfoundry.com/signup/HACK

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STEP 1 - Fetch password from email

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CONFIDENTIAL

STEP 2 - Login to Cloud Foundry

•sudo gem install vmc

•vmc login <username>

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STEP 3 - Push your code to Cloud Foundry

vmc push

• Detects runtime automatically. • In addition if you have manifest.yml vmc will read:

• App Name • App Instances• Services to bind to App

•Demo

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Services on Cloud Foundry

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Current Services Available on Cloud Foundry

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Creating a service instance$ vmc create-service mysql --name mysql1

Creating Service: OK

$ vmc services

============== System Services ==============+------------+---------+---------------------------------------+| Service | Version | Description |+------------+---------+---------------------------------------+| mongodb | 1.8 | MongoDB NoSQL store || mysql | 5.1 | MySQL database service || postgresql | 9.0 | PostgreSQL database service (vFabric) || rabbitmq | 2.4 | RabbitMQ messaging service || redis | 2.2 | Redis key-value store service |+------------+---------+---------------------------------------+

=========== Provisioned Services ============

+-------------+---------+| Name | Service |+-------------+---------+| mysql1 | mysql |+-------------+---------+

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$ vmc push cer-spring --path web/target/Application Deployed URL [cer-spring.cloudfoundry.com]: Detected a Java SpringSource Spring Application, is this correct? [Yn]:

Memory Reservation (64M, 128M, 256M, 512M, 1G) [512M]:

Creating Application: OKWould you like to bind any services to 'cer-spring'? [yN]: y

Would you like to use an existing provisioned service? [yN]: yThe following provisioned services are available

1: mysql1

2: mysql-135e0Please select one you wish to use: 1

Binding Service [mysql1]: OKUploading Application:

Checking for available resources: OK

Processing resources: OK Packing application: OK

Uploading (12K): OK

Binding a service to an application

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1: mysql1





Uploading (12K): OK


Would you like to bind any services to 'cer-spring'? [yN]: yWould you like to use an existing provisioned service? [yN]: yThe following provisioned services are available1: mysql12: mysql-135e0Please select one you wish to use: 1Binding Service [mysql1]: OK

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1: mysql1





Uploading (12K): OK


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$ vmc bind-service mysql1 myappBinding Service [mysql1]: OKStopping Application 'myapp': OKStaging Application 'myapp': OK Starting Application 'myapp': OK$

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Every day development on Cloud Foundry

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Every day development§ Debugging and accessing the data locally

• Caldecott --> Service tunneling. Access your Cloud Foundry service as if it was local.

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Tunneling

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gem install caldecott

vmc tunnel <mongodb>

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Using your favorite tools

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What is Activity Streams ?

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http://activityStrea.ms§ Activity Streams is a simple open specification used to describe social

actions around the web.

§ The goal of Activity Streams is data portability

§ Some publishers of Activity Streams: Socialcast, MySpace, Facebook and G+

§ The default format is JSON but Atom is also supported. The JSON format was added after we saw some initial limitations with JSON

§ Core concepts are: Actor, Verb, Object and Target

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http://ActivityStrea.ms

http://ActivityStrea.ms


Actor -> Monica

Verb -> Pinned(Bookmarked)

Object -> Rosa Parks’ Bio Page

Target -> Female Leaders Board

Source -> Pinterest

Published -> MLK Day 2012

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CONFIDENTIAL45

Example Activity

John posted “SCALA 2012 Recap” on his blog “John OSS”10 minutes ago

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Activity in JSON

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{ "published": "2011-02-10T15:04:55Z", "actor": { "url": "http://example.org/john", "objectType" : "person", "id": "tag:example.org,2011:john", "image": { "url": "http://example.org/john/image", "width": 250, "height": 250 }, "displayName": "John Smith" }, "verb": "post", "object" : { “objectType” : “blog-entry”, “url": "http://example.org/blog/2011/02/entry", "id": "tag:example.org,2011:abc123/xyz" }, "target" : { "url": "http://example.org/blog/", "objectType": "blog", "id": "tag:example.org,2011:abc123", "displayName": "John OSS" } }

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What is an Activity Stream Engine ?§ An activity stream engine allows you to publish events and subscribe to

events.

§ Many activity stream engine support aggregation of events via Streams.

§ Many activity stream engines support fanning out activities to subscribers.

§ Many activity stream engines tailor the stream to the reader providing Key Stats and Contextual Info. Example: Monica with 1000 followers or Bank of America established in 1989

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Building an Activity Streams Engine

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What should we use to store Activities ?

ColumnKey-Value Document Graph

Redis, Riak

Cassandra,HBase

MongoDB Neo4J

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ColumnKey-Value Document Graph

MongoDB (so easy)

Mongo DB schema-less documents are perfect for Activities

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About MongoDB

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1. No-SQL database

2. Stores JSON-style documents with embedded documents

3. Horizontally scalable

4. Full Indexing Support

5. Open Source so great ORMs and drivers.

development : {

tools: many,

language_support: superb,

agility: high

},

production: {

speed: fast

fault_tolerance: true

scalability: high

=

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CONFIDENTIAL

Step 1- Build the persistence Modelvar MediaLinkHash = {

duration: Number, height: Number, width: Number, url: String };

var ActivityObjectHash = { id: {type: String}, image: MediaLinkHash, displayName: {type: String}, summary: {type: String}, content: {type: String}, url: {type:String}, author: {type: ObjectId, ref: 'activityObject'}, published: {type: Date, default: Date.now}, updated: {type: Date, default: Date.now}, objectType: {type: String}, attachments: [{type: ObjectId, ref: 'activityObject'}], upstreamDuplicates: [String], downstreamDuplicates: [String] };

var ActivityObjectSchema = new Schema(ActivityObjectHash) this.ActivityObject = mongoose.model('activityObject', ActivityObjectSchema);

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Step 1- Persistence Model var ActivitySchema = new Schema({ id: {type: String}, verb: {type: String}, url: {type: String}, title: {type: String}, content: {type: String}, icon: MediaLinkHash, object: ActivityObjectHash, actor: ActivityObjectHash, target: {type: ObjectId, ref: 'activityObject'}, published: { type: Date, default: Date.now}, updated: { type: Date, default: Date.now}, inReplyTo: {type: ObjectId, ref: 'activity'} });

this.Activity = mongoose.model('activity', ActivitySchema);

return this;};

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Step 2 - Expose helpers for the queries§ The most important is to be able to list the activities in

descending order by published time.§ It is also important to hydrate any objects for which we

have references

§ With Mongoose you can do: § this.getActivityStream = function(n, fx) { Activity.find().sort('published', 'descending').limit(n).populate('target').run(fx);

}

§ More at: https://github.com/cloudfoundry-samples/activity-streams-mongoose

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https://github.com/cloudfoundry-samples/activity-streams-mongoose




CONFIDENTIAL

How do we make our engine faster and more scalable ?§ Add support for PubSub§ In a PubSub model as soon as an event is published it

gets sent to all the subscribers.§ The Publisher doesn’t know who the subscribers are, it

simply knows where to publish.§ Redis has nice support for Pub Sub http://redis.io/topics/

pubsub

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http://redis.io/topics/pubsub




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Exposing the Engine as Service

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Using Socket.io

§ Server Side:• Subscribe to a Stream• When there is a new event send it to the client as JSON

§ Client Side• Add support to publish activities to the Stream• Change the client rendering to use ActivityStrea.ms

§ Benefits• Richer messaging• Activity Syndication

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Demo

http://asms.cloudfoundry.com

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Thank You - Questions ?Cloud Foundry Activity Streams Libraries are at:

https://github.com/organizations/cloudfoundry-samples

http://cloudfoundry.com

Questions: @cloudfoundry - @ciberch or [email protected]

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http://twitter.com/cloudfoundry

http://twitter.com/cloudfoundry

http://twitter.com/ciberch

http://twitter.com/ciberch

MongoSF 2012

Technology

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