oliverdavies.uk-old-sculpin/source/_posts/2019-09-13-live-blogging-symfonylive-london.md

title	tags
Live Blogging From SymfonyLive London 2019	conference symfony symfonylive php

Inspired by Matt Stauffer's live blogging of the keynote at Laracon US, I’m going to do the same for the sessions that I’m attending at SymfonyLive London 2019...

Keynote (Back to the basics)

Embrace the Linux philosophy

• How we grow the Symfony ecosystem. Built abstracts.
• HttpFoundation, HttpKernel
• Moved to infrastructure
• A few abstractions on top of PHP. Improved versions of PHP functions (dump and var_dump)
• Started a add higher level abstractions (e.g. Mailer), built on the lower ones.
• Recently worked on PHPUnit assertions. Mailer in Symony 4.4. Can test if an email is sent or queued

Building flexible high-level abstractions on top of low-level ones

What's next?

• Mailer announced in London last year. New component.
• System emails? e.g. new customer, new invoice.
• Symfony Mailer = Built-in responsive, flexible, and generic system emails
  • Twig with TwigExtraBundle
  • Twig inky-extra package (Twig 1.12+)
  • Zurb Foundation for Emails CSS stylesheet
  • Twig cssinliner-extra package (Twig 1.12+)
  • Optimised Twig layouts
• SystemEmail class extends templated email
• Can set importance,
• Customisable
• Always trying to keep flexible, so things can be overidden and customised

Sending SMS messages

• new Texter and SmsMessage class for sending SMS messages
• Same abstraction as emails, but for SMS messages
• Based on HttpClient + Symfony Messenger and third-party providers (Twilio and Nexmo) twilio:// and nemxo://
• Can set via transport $sms->setTransport('nexmo')
• Extend the SystemEmail and do what you want
• Failover

Sending Messages

• Create ChatMessage
• Telegram and Slack
• $message->setTransport('telegram'), $bus->dispatch($message)
• Send to Slack and Telegram
• SlackOptions and TelegramOptions for adding emojis etc
• Common transport layer TransportInterface, MessageInterface
• Failover - e.g. if Twilio is down, send to Telegram

New component - SymfonyNotifier

• Channels - email, SMS, chat
• Transport, slack, telegram, twilio
• Create a notification, arguments are message and transports (array)
• Receiver
• Customise notifications, InvoiceNotification extends Notification. getChannels
  • Override default rendering
  • ChatNotificationInterface - asChatMessage()
• Semantic configuration
  • composer req twilio-notifier telegram-notifier
• Channels
  • Mailer
  • Chatter
  • Texter
  • Browser
  • Pusher (iOS, Android, Desktop native notifications)
  • Database (web notification centre)
  • A unified way to notify Users via a unified Transport layer
• Each integration is only 40 lines of code

What about a SystemNotification?

• Autoconfigured channels
• new SystemNotification, Notifier::getSystemReceivers
• Importance, automatically configures channels
• Different channels based on importance
• ExceptionNotification - get email with stack trace attached

Notifier

• send messages via a unified api
• send to one or many receivers
• Default configu or custom one

### How can we leverage this new infrastructure?

• Monolog NotifierHandler - triggered on Error level logs

• Uses notified channel configuration

• Converts Error level logs to importance levels

• Configurablelike other Notifications

• 40 lines of code

• Failed Messages Listener - 10 lines of glue code

• Experimental component in 5.0

• Can't in in 4.4 as it's a LTS version

• First time an experimental component is added

• Stable in 5.1

Queues, busses and the Messenger component (Tobias Nyholm)