Building a cloud-friendly application

Presented by Larry Garfield (@Crell)

@Crell

Larry implements Huggable
  • Director of DX, Platform.sh
  • PHP-FIG Core Committee
  • implements Huggable
Software is eating the world, and cloud is eating software. (Source: @bassamtabbara)
What is cloud
computing?
What is
The Cloud?

These are separate questions...

The Cloud™: noun

Someone else's hard drive

Cloud computing: noun

Abstracting away physical infrastructure

Disposable application design

What makes an application
cloud-friendly?

They're not rules

They're more like guidelines...

They're more like guidelines

Split code from content

Code

  • Provided by developer
  • Carefully tested
  • Lives in version control
  • Read-only runtime

Content

  • Provided by users
  • Frequently ad hoc
  • Lives in DB or filesystem
  • Writeable runtime
Don't mix the filesystems

Your application is disposable.
Your data is not.

Data flow

You don't get an in-between option

Take-away

Cleanly separate "Dev provided" and "user provided" files

What is configuration?

Does config come from the developer or the user?

Git or Database?

Drupal Config Management

Drupal 8
  1. Configure in UI / DB
  2. Export to YAML
  3. Commit to Git
  4. Push / Pull
  5. Import back to DB

Take-away

Decide

What happens at runtime
stays at runtime

Application slots into cluster

Dependency inject your environment

  • DB credentials (Solr, Redis, etc.)
  • API keys
  • All paths on disk
  • Domain names

Environment variables


getenv('foo');

$_ENV['foo'];

$_ENV['foo']['bar'];
        

Only ever use getenv()

Need glue code

Platform.sh

Symfony 3


// platform_parameters.php
// Configure the database.
if (getenv('PLATFORM_RELATIONSHIPS')) {
    $dbRelationshipName = 'database';
    $relationships = json_decode(base64_decode(getenv('PLATFORM_RELATIONSHIPS')), true);

    foreach ($relationships[$dbRelationshipName] as $endpoint) {
        if (!empty($endpoint['query']['is_master'])) {
            $container->setParameter('database_driver', 'pdo_'.$endpoint['scheme']);
            $container->setParameter('database_host', $endpoint['host']);
            $container->setParameter('database_port', $endpoint['port']);
            $container->setParameter('database_name', $endpoint['path']);
            $container->setParameter('database_user', $endpoint['username']);
            $container->setParameter('database_password', $endpoint['password']);
            $container->setParameter('database_path', '');
            break;
        }
    }
}
// Set a default unique secret, based on a project-specific entropy value.
if (getenv('PLATFORM_PROJECT_ENTROPY')) {
    $container->setParameter('kernel.secret', getenv('PLATFORM_PROJECT_ENTROPY'));
}
        

Platform.sh / Symfony 4


composer require platformsh/symfonyflex-bridge
        

mapPlatformShEnvironment();

function mapPlatformShEnvironment() : void
{
    if (!getenv('PLATFORM_APPLICATION')) {
        return;
    }

    $secret = getenv('APP_SECRET') ?: getenv('PLATFORM_PROJECT_ENTROPY') ?: null;
    setEnvVar('APP_SECRET', $secret);

    $appEnv = getenv('APP_ENV') ?: 'prod';
    setEnvVar('APP_ENV', $appEnv);

    if (!getenv('DATABASE_URL')) {
        mapPlatformShDatabase();
    }
}
// ...
        

Platform.sh / Laravel


composer require platformsh/laravel-bridge
        

mapPlatformShEnvironment();

function mapPlatformShEnvironment() : void
{
    if (!getenv('PLATFORM_APPLICATION')) {
        return;
    }

    mapAppUrl();

    $secret = getenv('APP_KEY') ?: getenv('PLATFORM_PROJECT_ENTROPY') ?: null;
    setEnvVar('APP_KEY', $secret);

    $secure_cookie = getenv('SESSION_SECURE_COOKIE') ?: 1;
    setEnvVar('SESSION_SECURE_COOKIE', $secure_cookie);

    if (getenv('PLATFORM_RELATIONSHIPS')) {
        $relationships = json_decode(base64_decode(getenv('PLATFORM_RELATIONSHIPS'), true), true);
        mapPlatformShDatabase('database', $relationships);
        mapPlatformShRedisCache('rediscache', $relationships);
        mapPlatformShRedisSession('redissession', $relationships);
    }
}
// ...
        

Glue of last resort

composer.json


{
    "autoload": {
        "files": ["extra-bridge.php"]
    }
}
        

Only works if your app reads env vars...

Use DotEnv

(PHP has several... because PHP)

Symfony\HttpFoundation

Request::setTrustedHosts()

Constants?

Take-away

Dependency inject your environment

User-configured connections

Installers

  1. Ask for DB credentials
  2. Ask user for basic site info
  3. Write credentials to config file
  4. Populate DB
  5. Write basic site info to config file/DB
  6. Profit!!!

Cloud

Better installers

  • Pre-include connection glue
  • Installer skips pre-populated values
  • Do not download from installer

Avoid lock-in

Always be able to
take your business elsewhere.

Use Free Software

Use replaceable services

Google has killed...

  • Reader
  • iGoogle
  • Google Talk
  • Google Health
  • Knol
  • Google Insights
  • Picnik
  • Buzz
  • Aardvark
  • Sidewiki
  • Notebook
  • Dictionary
  • Labs
  • Wave
  • SearchWiki
  • Dodgeball
  • Jaiku
  • Lively
  • Page Creator
  • Plus
  • Zeitgeist
  • Answers
  • Google X
  • Catalog
  • Web Accelerator
  • Video Player
  • Sets
  • SearchMash
  • Writely

Source: WordStream (2015)

Safe

  • MySQL/MariaDB
  • PostgreSQL
  • MongoDB
  • RabbitMQ
  • Solr/Elasticsearch
  • InfluxDB

Unsafe

  • Amazon RDS
  • Amazon DynamoDB
  • Azure Cosmos DB
  • Anything you can't replace in a day

To summarize...

Remember what they say when you assume

Larry Garfield

@Crell

Director of Developer Experience Platform.sh

Continuous Deployment Cloud Hosting

Stalk us at @PlatformSH