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Symfony Messenger 4.3 Symfony User Group Köln Von Thomas Wolf, www.foto-tw.de, CC BY-SA 3.0 de, https://commons.wikimedia.org/w/index.php?curid=62082470

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Denis Brumann @dbrumann [email protected]

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Message Bus Handler

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Message

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framework-agnostic data object

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Bus

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Handler

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framework-agnostic service reacting to a specific message

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send receive

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Transport

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Sender Receiver

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framework: messenger: transports: sync: 'sync://null' async: '%env(MESSENGER_TRANSPORT_DSN)%' routing: App\Message\RegisterUserMessage: 'async'

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framework: messenger: transports: sync: 'sync://null' async: 'amqp://root:s3cr3t@myhost/%2f/topic' routing: App\Message\RegisterUserMessage: 'async'

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AMQP (RabbitMQ) Doctrine Redis

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bin/console messenger:setup-transports

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send

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bin/console messenger:consume receive

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Usage: messenger:consume [options] [--] [...] messenger:consume-messages Arguments: receivers Names of the receivers/transports to consume in order of priority [default: ["async"]] Options: -l, --limit=LIMIT Limit the number of received messages -m, --memory-limit=MEMORY-LIMIT The memory limit the worker can consume -t, --time-limit=TIME-LIMIT The time limit in seconds the worker can run --sleep=SLEEP Seconds to sleep before asking for new messages after no messages were found [default: 1] -b, --bus=BUS Name of the bus to which received messages should be dispatched (if not passed, bus is determine automatically.

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send receive

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Failing Messages

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framework: messenger: ... # default configuration retry_strategy: max_retries: 3 delay: 1000 # delay for first retry multiplier: 2 # multiply delay with each try max_delay: 0 # service: null # id for custom RetryStrategy

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UnrecoverableMessageHandlingException

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framework: messenger: failure_transport: 'failed' transports: failed: 'doctrine://default?queue_name=failed' routing: ...

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bin/console messenger:failed:show bin/console messenger:failed:retry bin/console messenger:failed:remove

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Middleware

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add_bus_name_stamp_middleware dispatch_after_current_bus send_message handle_message failed_message_processing_middleware

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add_bus_name_stamp_middleware dispatch_after_current_bus send_message handle_message failed_message_processing_middleware your middleware your middleware your middleware

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framework: messenger: buses: event_bus: default_middleware: 'allow_no_handlers' middleware: - 'messenger.middleware.validation'

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ReceivedStamp HandledStamp

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Messages Buses Handlers & Transports

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Which messages are sent over which transport? config/packages/messenger.yaml framework : messenger : routing

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How to limit a transport to a bus? config/packages/messenger.yaml framework : messenger : routing

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Which Handler processes a message? Service Tag messenger.message_handler

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Which Handler processes a message? name: 'messenger.message_handler', handles: '*', # which message(s) to handle bus: 'event_bus', # restrict handler to specific bus method: 'handleEvent', # method to be called on handler priority: 1, # prioritize handler over others from_transport: 'async', # handle only received messages

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Which Handler processes a message?

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Which bus is injected into a service? config/packages/services.yaml Argument Binding

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Which bus is injected into a service? framework: messenger: default_bus: 'first_bus' buses: first_bus: middleware: - 'messenger.middleware.validation' second_bus: ...

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Which bus is injected into a service? services: _defaults: bind: $firstBus: 'first_bus' $secondBus: 'second_bus'

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Which bus is injected into a service?

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Usage examples https://github.com/dbrumann/invite-registration https://github.com/dbrumann/messenger-screenshot-demo https://github.com/dbrumann/dpc2019-workshop