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Overview

This plugin enables the consumption of transactions from an AMQP queue provided by a queue system, such as RabbitMQ, widely used in enterprise applications.

The transactions are processed on a first-in first-out (FIFO) order, even when the producer nodeos switches during auto failover. This feature can make it easier to integrate the blockchain with enterprise applications which use queues widely

It can receive transactions encoded using the chain::packed_transaction_v0 or chain::packed_transaction formats.

Usage

# config.ini
plugin = eosio::eosio::amqp_trx_plugin
[options]
# command-line
nodeos ... --plugin eosio::eosio::amqp_trx_plugin [options]

Configuration Options

These can be specified from both the nodeos command-line or the config.ini file:

  --amqp-trx-address arg                AMQP address: Format:
                                        amqp://USER:PASSWORD@ADDRESS:PORT
                                        Will consume from amqp-trx-queue-name
                                        (amqp-trx-queue-name) queue.
                                        If --amqp-trx-address is not specified,
                                        will use the value from the environment
                                        variable EOSIO_AMQP_ADDRESS.
  --amqp-trx-queue-name arg (=trx)      AMQP queue to consume transactions
                                        from, must already exist.
  --amqp-trx-queue-size arg (=1000)     The maximum number of transactions to
                                        pull from the AMQP queue at any given
                                        time.
  --amqp-trx-retry-timeout-us arg (=60000000)
                                        Time in microseconds to continue to
                                        retry a connection to AMQP when
                                        connection is loss or startup.
  --amqp-trx-retry-interval-us arg (=500000)
                                        When connection is lost to
                                        amqp-trx-queue-name, interval time in
                                        microseconds before retrying
                                        connection.
  --amqp-trx-speculative-execution      Allow non-ordered speculative execution
                                        of transactions
  --amqp-trx-ack-mode arg (=in_block)   AMQP ack when 'received' from AMQP,
                                        when 'executed', or when 'in_block' is
                                        produced that contains trx.
                                        Options: received, executed, in_block
  --amqp-trx-startup-stopped            do not start plugin on startup -
                                        require RPC amqp_trx/start to start
                                        plugin
  --amqps-ca-cert-perm arg (=test_ca_cert.perm)
                                        ca cert perm file path for ssl,
                                        required only for amqps.
  --amqps-cert-perm arg (=test_cert.perm)
                                        client cert perm file path for ssl,
                                        required only for amqps.
  --amqps-key-perm arg (=test_key.perm) client key perm file path for ssl,
                                        required only for amqps.
  --amqps-verify-peer                   config ssl/tls verify peer or not.