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FLIPPING OUT WITH FEATURE FLAGS & TOGGLES PHP YORKSHIRE 2017 @MICHAELCULLUMUK

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ME?

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MICHAEL CULLUM @MICHAELCULLUMUK

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BACK TO BASICS

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CONDITIONALS

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CONDITIONALS

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FEATURE FLAG

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WHAT’S IN A NAME?

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SWIFT MAILER

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SWIFT MAILER swiftmailer: disable_delivery: ~

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SWIFT MAILER setParameter('swiftmailer.enabled', false); } else { $container->setParameter('swiftmailer.enabled', true); }

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SWIFT MAILER setParameter('swiftmailer.enabled', false); } else { $container->setParameter('swiftmailer.enabled', true); }

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ALTERNATIVE TO BRANCHING?

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VARY BY: ENVIRONMENT USER

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DIFFERENT SUBSET OF USERS

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A/B TESTING

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BOOKING.COM MODEL

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TEST IN PRODUCTION

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MONOLITHIC REPOSITORIES

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TEST A MATRIX OF CHANGES

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MANAGING YOUR FLAGS

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RETRIEVING FEATURE FLAG VALUES

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SPLIT IT OUT

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HARDCODED

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HARDCODED

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PARAMETERS IN CONFIG FILES container->getParameter('swiftmailer.enabled', $flag); } elseif (isset($this->container->getParameter(sprintf('flag.%s', $flag)))) { return $this->container->getParameter(sprintf('flag.%s', $flag)); } return false; }

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CACHE function isEnabled(string $flag): boolean { $cache = $this->cache; $flag = $cache->getItem(sprintf('flag.%s', $flag)); if (!$flag->isHit()) { $flag->get(); } return false; }

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DATABASE

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SETTING FEATURE FLAG VALUES

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DATABASE

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CODEBASE

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USING THEM CLEANLY

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TWIG {% if isFeatureEnabled('showCfpForm') %} {{ form(form) }} {% endif %}

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TWIG

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COMPLEXITY getParameter('profileFeature')) { if ($container->getParameter('newProfileStyle')) { if ($container->getParameter('newProfileStyleButtons')) { enableButtons(); } if ($container->getParameter('myNewCoolProfilePic')) { renderPicture(); if ($container->getParameter('newProfileRenderEngine')) { tryDifferentRenderEngine(); } } renderNewProfiler(); } else { // Render the legacy profile } }

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COMPLEXITY getParameter('profileFeature')) { if ($container->getParameter('newProfileStyle')) { if ($container->getParameter('newProfileStyleButtons')) { enableButtons(); } if ($container->getParameter('myNewCoolProfilePic')) { renderPicture(); if ($container->getParameter('newProfileRenderEngine')) { tryDifferentRenderEngine(); } } renderNewProfiler(); } else { // Render the legacy profile } }

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COMPLEXITY getParameter('profileFeature')) { if ($container->getParameter('newProfileStyle')) { if ($container->getParameter('newProfileStyleButtons')) { enableButtons(); } if ($container->getParameter('myNewCoolProfilePic')) { renderPicture(); if ($container->getParameter('newProfileRenderEngine')) { tryDifferentRenderEngine(); } } renderNewProfiler(); } else { // Render the legacy profile } }

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CONTROLLERS

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CONTROLLERS - YAML profile: path: /profile/{user} defaults: _controller: DemoBundle:Profile:legacy _alt: DemoBundle:Default:new _flag: newProfile

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CONTROLLERS - EVENT getRequest->attributes->get('_flag'); $alternate = $event->getRequest->attributes->get('_alt'); if (isEnabled($flag)) { $event->getRequest->attributes->set(‘controller’, $alternate); } }

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CONTROLLERS - EVENT getRequest->attributes->get(‘_flag'); $alternate = $event->getRequest->attributes->get(‘_alt'); if (isEnabled($flag)) { $event->getRequest->attributes->set(‘_controller’, $alternate); } if (!isset($alternate) && isset($flag) && !isEnabled($flag)) { throw new NotFoundHttpException(); } }

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CONTROLLERS - EVENT getRequest->attributes->get(‘_flag'); $alternate = $event->getRequest->attributes->get(‘_alt'); if (isEnabled($flag)) { $event->getRequest->attributes->set(‘_controller’, $alternate); } if (!isset($alternate) && isset($flag) && !isEnabled($flag)) { throw new NotFoundHttpException(); } }

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SERVICE FACTORIES

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NON-GENERIC FACTORY get(‘newProfile’) : $container->get(‘legacyProfile’); } }

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GENERIC FLAGS FACTORY get($service) : $container->get($alternate); } }

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GENERIC FLAGS FACTORY services: app.flagsFactory: class: AppBundle\FlagsFactory app.profileManager: class: AppBundle\Profile\ProfileManager factory: ['@app.flagsFactory', createService] arguments: - newProfile - legacyProfileManager - newProfileManager

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REMOVE THEM LATER OR NOT?

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ALLOWS YOU TO

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BRANCHING WITHOUT CONFLICTS OR VCS

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TEST IN PRODUCTION

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SLOW ROLLOUT

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FUNCTIONALITY ON DIFFERENT ENVIRONMENTS

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A/B TESTING

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CLEANLY

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DATABASE OR CONFIGURATION FILES

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AVOIDING LARGE CONDITIONALS

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THANKS @MICHAELCULLUMUK

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FLIPPING OUT WITH FEATURE FLAGS & TOGGLES PHP YORKSHIRE 2017 @MICHAELCULLUMUK