Open a window, see the clouds - php|tek 2011

Open a Window, see the clouds

Rafael Dohms photo credit: Denis Grzetic

Wednesday, May 25, 2011

Rafael Dohms

photo credit: Eli White
PHP Evangelist and ZCE in Brazil and a very
active member of the PHP Community. He
helped found two PHP User Groups over the
years and currently shares the lead of PHPSP.
Developer, gamer and lover of code he also
hosts Brazil’s ﬁrst PHP Podcast: PHPSPCast.

Currently he works for MIH SWAT Team, a
group of experts that provides technical
knowledge to the MIH group as well as working
on R&D in search of the new and exciting niches
of the web. His role as a Senior PHP
Developer is to code, train and aid other
companies and to have fun doing so.


PEEKING OUT THE WINDOW

• What is the Cloud?

• Why choose the Cloud?

• Let’s take a look at Windows Azure

• How does that affect my code?


WHAT IS THE CLOUD?
not just another buzzword bingo word


REGULAR HOSTING

• Shared account, VPS or Local
Machine

• One machine, one place

• Pay by month


Self
REGULAR HOSTING

• Shared account, VPS or Local
Machine

• One machine, one place

• Pay by month


CLOUD COMPUTING

• Less “physical attachment”

• One or multiple machines or
“instances”

• Geologically spread

• Pay per hour/usage/data

• “abstraction” of resources

• 3 Flavors: IaaS, PaaS, SaaS


Data

Application

Software

Operating System

Hardware/Network


Storing Data Sharing

Deploying Application Developing

MySQL Software Apache

Configuring Operating System Upgrading

Cooling Hardware/Network Cabling


IaaS a Service”
“Infrastructure as

Data

Application

Software

Operating System

Hardware/Network


IaaS a Service”
“Infrastructure as

Data

Application

Software

Operating System you
them
Hardware/Network


PaaS
“Platform as a Service”

Data

Application

Software

Operating System

Hardware/Network


PaaS
“Platform as a Service”

Data

Application you
them
Software

Operating System

Hardware/Network


SaaS
“Software as a Service”

Data

Application

Software

Operating System

Hardware/Network


SaaS
“Software as a Service”

Data you
them
Application

Software

Operating System

Hardware/Network


X
WHY CHOOSE THE CLOUD?
What are the advantages of using the cloud?


trafﬁc

time

THE UTILITY MODEL

trafﬁc

peak

time

THE UTILITY MODEL

IaaS Paas SaaS

costs

server managment.

software management

product deploy


AVAILABILITY

SCALABILITY
Stateless Compute + Durable Storage

LET’S LOOK INSIDE


Windows Azure Overview

Fabric

Compute Storage


Fabric
Middleware, used for developing, deploying and
managing your applications

AppFabric

developer


Fabric

Compute Storage


Compute

Web Role Worker Role VM Role

Windows Server
Web application
Background 2008 instance that
running on top of
processing can be loaded on
IIS
demand


Cached version of
CDN any resource in
storage with a URI
Storage

Data Storage

Table Storage Blob Storage SQL Azure Queue

Text and binary Compatible with Messaging between
Structured Storage
data SQL Server Web and Worker


UP & RUNNING
for Development and Deployment

• Requisites:

• IIS7 Tools

• Azure SDK (install DevAppFabric, the azure emulator)

• Command Line Tools

• Command line tools for PHP


BASIC TOOLSET

• Command Line tools for PHP

• Packages applicationand runs in emulator, with simulated
compute and storage.

• Azure Tools for Eclipse

• Makes most processes a click-through process and gives you
a nice IDE


Developer Environment
Azure Emulator Code
(Dev fabric)

Packaging tools
(command line or eclipse)
Package + Service
Conﬁguration

Azure

Window Azure
(AppFabric)

SQLAzure Storage


Azure Emulator Code
(Dev fabric)

PHP
Packaging tools
(command line or eclipse)
Package + Service
Conﬁguration

Azure

Window Azure
(AppFabric)

SQLAzure Storage


Azure Emulator Code
(Dev fabric)

php package.php
PHP
--project="twitter-azure" Packaging tools
--target="c:azure-build" (command line or eclipse)
--source="C:twitter-azure"
Package + Service
--defaultDoc="public/index.php"
Conﬁguration
--phpRuntime="C:Program Files (x86)PHPv5.3"
--cleanRebuild
--runDevFabric Azure

Window Azure
(AppFabric)

SQLAzure Storage


THE GOOD

• REST APIs

• Storage

• Diagnostics

• Relational DB: SQL Azure

• Role Architecture


THE BAD

• Windows-only Management

• No Azure Emulator for
non-Windows OS

• No Packaging
Command Line tools
for non-Windows OS


HOW DOES THAT AFFECT CODE?
What tools can we use and how should we design our apps


WHAT DO I WORRY ABOUT?



Code


Code PHP on IIS/Windows


Architecture



Scaling

Architecture



Scaling No Local Storage

Architecture



Scaling No Local Storage Session sharing

Architecture




Worker Roles
Architecture




Worker Roles Queues

Architecture



Storage


Worker Roles Queues

Architecture



What kind?

Storage


Worker Roles Queues

Architecture



Table / Blob
What kind?

Storage


Worker Roles Queues

Architecture



Table / Blob Framework or PHP SDK

What kind?

Storage


Worker Roles Queues

Architecture




What kind?
Relational
Database
Storage


Worker Roles Queues

Architecture




What kind?
Relational Migrate to SQL Azure
Database
Storage


Worker Roles Queues

Architecture


AZURE-READY FRAMEWORKS

WHAT MAKES IT COMPATIBLE?

Code Does it run on PHP on Windows?

Tools Does it have API Handlers?

Database Does it offer MS SQL Compatibility?


Tools
• Blobs, Tables and Queues
(CRUD operations)

• Helper Classes for HTTP
transport, AuthN/AuthZ, REST
and Error Management

• Manageability,
Instrumentation and Logging
support

Database

• Not tested, but should work
well.


Database

• MS-SQL Drivers* are
compatible with
SQLAzure

* Using pdo_sql_server, possibly pdo_dblib

Powered by Doctrine:


• PHP code runs normally,
in Azure so any
framework will work.

• You will need other
tools to
communicate with
resources like: DB, Queue,
etc...

• These have been tested!


AZURE PHP SDK

• Services:

• Blob Storage

• Table Storage

• Queue Storage

• Diagnostic Tools

• Compatible with PHP 5+


GOING OUT THE WINDOW
Sample migration to the cloud

• Sample Application: “Twitter RT Calculator”

• Objective: Analyse your latest tweets that were
ReTweeted, and calculate stats based on locations and words.

• Show how to migrate:

• Database: MySQL > SQLAzure

• Move processing into a worker role using the Queue


Twitter OAuth

Wait for it...


Twitter OAuth

Wait for it...

MySQL


Twitter OAuth

Wait for it...

MySQL

Results


Twitter OAuth

Don’t call me, i’ll
call you


Twitter OAuth

Queue

call you


Twitter OAuth

Queue

call you

Worker


Twitter OAuth

Queue

call you

Worker

SQLAzure

Twitter OAuth

Queue

call you

Worker

Results

SQLAzure

Twitter OAuth

Queue

call you

Worker
Worker
Worker
Worker
Worker
Worker
Worker
Worker
Worker
Worker
Worker

Results

SQLAzure

USING SQLAZURE
PDO MSSQL Driver

doctrine.dbal.connection_options:
driver: pdo_sqlsrv
dbname: twitter-sample-app
host: pl69qjwy8k.database.windows.net
port: 1433
user: rdohmsDemo@pl69qjwy8k
password: *password*


LINE THEM UP IN THE QUEUE
//Add user to our Queue
$qItem = new stdClass();
$qItem->twitter_handle = $twitterInfo->screen_name;

$qManager = new AzureQueue($this->getApp()->getConfig('azure'));
$qManager->addToQueue($qItem);




$this->client = new Zend_Service_WindowsAzure_Storage_Queue(
$qConfig['host'], $qConfig['accountName'], $qConfig['accountKey']
);

$this->queue = $this->getQueueInstance($queueName);
__contruct()




$this->client = new Zend_Service_WindowsAzure_Storage_Queue(
$qConfig['host'], $qConfig['accountName'], $qConfig['accountKey']
);

$this->queue = $this->getQueueInstance($queueName);
__contruct()

public function addToQueue($item)
{
$this->client->putMessage($this->queue->name, serialize($item));
}


while (true){

try{
$this->logAction("Checking for messages..."); FIRST COME,
//Read Queue
$qMessage = $qManager->getMessage();

//If no message, sleep for 3 seconds and try again
FIRST SERVED
if ($qMessage === null){
$this->logAction("No pending messages...");
sleep(3);
continue;
}

//Retrieve User
{... doctrine query for stored twitter handle ...}

//Clear Message
$this->logAction("Removing message form queue...");
$qManager->deleteMessage($qMessage);

//Process User
$this->processUser($user);

//Warn User
$this->sendWarning($user);

} catch (Exception $e) {
$this->logAction("Exception found:" .$e->getMessage

}

$this->logAction("Initiating sleep for next loop.");
sleep(2);
}

while (true){

try{
//Read Queue

FIRST SERVED
$this->logAction("No getMessage()
public function pending messages...");
{
sleep(3);
$messages = $this->client->getMessages($this->queue->name, 1);
continue;
}
if (count($messages) > 0){
//Retrieve User $qMessage = array_shift($messages);
$message = new stdClass();
//Clear Message $message->qMessage = $qMessage;
$message->decoded = unserialize($qMessage->messagetext);
return $message;
//Process User
}

return null;
//Warn User
}

}

sleep(2);
}

while (true){

try{
//Read Queue

FIRST SERVED
$this->logAction("No getMessage()
public function pending messages...");
{
sleep(3);
$messages = $this->client->getMessages($this->queue->name, 1);
continue;
}
if (count($messages) > 0){
//Retrieve User $qMessage = array_shift($messages);
$message = new stdClass();
//Clear Message $message->qMessage = $qMessage;
$message->decoded = unserialize($qMessage->messagetext);
return $message;
//Process User
}

return null;
//Warn User
$this->sendWarning($user); array(
} 'messageid' => $messageId,
'insertiontime' => $insertionTime,
'expirationtime' => $expirationTime,
'popreceipt' => $popReceipt,
'timenextvisible' => $timeNextVisible,
}
'dequeuecount' => $dequeueCount,
'messagetext' => $messageText
);
sleep(2);
}

while (true){

try{
//Read Queue

FIRST SERVED
$this->logAction("No pending messages...");
sleep(3);
continue;
}

//Retrieve User

//Clear Message
$qManager->deleteMessage($qMessage); After 20 seconds, message goes
//Process User back into Queue

//Warn User


}

sleep(2);
}

GOING OUT THE WINDOW

• See all changes: github.com/rdohms/Sample-Azure-App

• Compare these branches:

non-cloud-version x cloud-designed-version


LOOKING BACK BEFORE
CLOSING THE WINDOW

• Found out what is the Cloud

• Looked at reasons on why to choose the Cloud

• We took a look at Windows Azure

• Peaked at how it affects our code?


FURTHER READING...

PHP Development in the
Cloud

ISBN: 9780981034522
Pages: 172
Authors: Ivo Jansch and Vito Chin

http://bit.ly/i9Awk0


GET STARTED, GET HELP
• Get a free account: WindowsAzurePass.com

• Talk to the Microsoft guys out in the Hall

• Ask them about pricing options

http://azurephp.com
http://phpazure.codeplex.com/
http://azurephptools.codeplex.com/
http://www.ben-waine.co.uk/blog/php-azure
http://marvelley.com/category/php/php-on-azure/


twitter.com/rdohms
http://doh.ms

Questions?

rafael@doh.ms

THANK YOU!
Feedback is very important, please visit: joind.in/3417

Open a window, see the clouds - php|tek 2011

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