v4.3.0

This release adds transaction and connection APIs while preserving existing defaults and return values.

Added

• AMQP.Transaction.select/1, commit/1, and rollback/1 for transactional publishing and acknowledgements. Transactions and publisher confirms cannot be enabled on the same channel.
• Connection introspection through AMQP.Connection.info/2, info_keys/0, info_keys/1, and connection_name/1.
• AMQP.Connection.register_blocked_handler/2 for connection blocked and unblocked notifications, delivered as Erlang record tuples.
• Connection close variants: AMQP.Connection.close/2 accepts a timeout in milliseconds, close/3 accepts a custom reply code and text, and close/4 accepts all three.
• AMQP.Channel.close/3 for a custom reply code and text.
• AMQP.Queue.purge/3 and AMQP.Confirm.select/2 with :nowait and its alias :no_wait. Both options default to false; setting either to true skips the broker reply and returns :ok.

Compatibility

• Existing Queue.purge/2 still waits for the broker reply and returns the message count. Existing Confirm.select/1 still waits for the broker reply.
• Invalid keys passed to Connection.info/2 raise ArgumentError without closing the connection or its channels.
• Verified with amqp_client 4.2.1 and 4.3.4; all 84 tests pass. The dependency requirement remains ~> 4.0.
• Documented an upstream limitation: repeated or replaced blocked-handler registrations retain monitors, and a previously registered handler exiting can terminate the connection. Keep those handlers alive until the connection closes.

Maintenance

• Refreshed locked dependencies, including amqp_client and rabbit_common to 4.3.4.

Pull request: #250

Full changelog: v4.2.1...v4.3.0