Rabbitmq & Postgresql
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The document presents an overview of RabbitMQ and PostgreSQL integration, focusing on message-oriented middleware (MOM) and the Advanced Message Queuing Protocol (AMQP). It discusses various messaging protocols, including STOMP and MQTT, and details the implementation of the pg_amqp extension for PostgreSQL, which enables communication between PostgreSQL and messaging systems. It also explains the setup, usage, and the PostgreSQL listen exchange feature that translates PostgreSQL notifications into AMQP messages.
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![PGDay.IT 2015 – 23 Ottobre 2015 - Prato 15 di 33
Amqp packetAmqp packet
Headers
Properties
Bytea [] data
Headers: defined by the Amqp specification
Properties: contain arbitrary, application – specific,
information](https://image.slidesharecdn.com/rabbit-eng-151024210039-lva1-app6892/85/Rabbitmq-Postgresql-15-320.jpg)
![PGDay.IT 2015 – 23 Ottobre 2015 - Prato 28 di 33
Installation & configurationInstallation & configuration
Unzip file into your RabbitMQ plugins directory
rabbitmqplugins enable pgsql_listen_exchange
To connect to PostgreSQL using the default
pgsql://postgres@localhost:5432/postgres
Edit rabbitmq.properties
[{pgsql_listen_exchange,
[
{host, "localhost"},
{port, 5432},
{dbname, "postgres"},
{user, "postgres"},
{password, ""}
]}
].](https://image.slidesharecdn.com/rabbit-eng-151024210039-lva1-app6892/85/Rabbitmq-Postgresql-28-320.jpg)
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- 3. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 3 di 33 AgendaAgenda Messaging system Rabbitmq introduction Postgresql and pg_amqp PostgreSQL Listen exchange
- 4. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 4 di 33 Message-oriented middlewareMessage-oriented middleware Messageoriented middleware (MOM) is software or hardware infrastructure supporting sending and receiving messages between distributed systems. MOM allows application modules to be distributed over heterogeneous platforms and reduces the complexity of developing applications that span multiple operating systems and network protocols https://en.wikipedia.org/wiki/Messageoriented_middleware
- 5. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 5 di 33 Why Should I use MOM?Why Should I use MOM? Need to scale Monitoring data feeds Need things done in order Use the cloud Decoupling applications by separating sending and receiving data Messaging is asynchronous
- 6. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 6 di 33 Different protocolsDifferent protocols Historically, message queuing has used proprietary, closed protocols By the time three standards have emerged which are used in open source message queue implementations: Advanced Message Queuing Protocol (AMQP) Streaming Text Oriented Messaging Protocol (STOMP) MQ Telemetry Transport (MQTT)
- 7. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 7 di 33 STOMPSTOMP Text based Like AMQP, STOMP provides a message header with properties, and a frame body Does not deal in queues and topics The broker must map onto something that it understands internally such as a topic, queue, or exchange Destinations are not mandated in the specification, different brokers may support different flavours of destination
- 8. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 8 di 33 STOMP BrokerSTOMP Broker Apache ActiveMQ HornetQ Net::STOMP::Client (an open source client implementation in Perl) Open Message Queue (OpenMQ) RabbitMQ (message broker, has support for STOMP) Ruby server, also known as stompserver http://stomp.github.io/implementations.html
- 9. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 9 di 33 AMQPAMQP Designed for interoperability between different vendors wide range of features related to messaging Lot of finegrained control possible with such a rich feature set
- 10. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 10 di 33 Protocol implementationsProtocol implementations Amqp :SwiftMQ, Apache Qpid, Apache MQ, Apache Apollo, RabbitMQ Stomp: Apache MQ, Apache Apollo, RabbitMQ, HornetQ, Stampy (http://stomp.github.io/implementations.html#STOM P_Servers) MQTT: Apache MQ, Apache Apollo, RabbitMQ, mosquitto, WebSphereMQ, HiveMQ, IBM Message Sight (https://github.com/mqtt/mqtt.github.io/wiki/server support)
- 11. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 11 di 33 MQTTMQTT Originally developed out of IBM’s pervasive computing team Provides publishandsubscribe messaging Publish = data to topics Subscribe = get data from topics Designed for resourceconstrained devices and low bandwidth, high latency networks (ideal for mobile and “Internet of Things”) MQTT’s strengths are simplicity (just five API methods)
- 12. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 12 di 33 MQTT BrokerMQTT Broker ActiveMQ, Apollo JoramMQ Mosquitto RabbitMQ http://www.scalagent.com/IMG/pdf/Benchmark_MQTT_servers v11.pdf
- 13. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 13 di 33 RabbitmqRabbitmq open source message broker software (MPL) Actively developed and with commercial support by Pivotal written in Erlang Client libraries to interface with the broker are available for all major programming languages. Gateways for HTTP, Streaming Text Oriented Messaging Protocol (STOMP), and MQTT protocols
- 14. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 14 di 33 Amqp native clientsAmqp native clients .NET PHP Java Python C /C++ Node.js Go Erlang Javascript Ruby Perl Scala Delphi Groovy Cobol Clojure
- 15. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 15 di 33 Amqp packetAmqp packet Headers Properties Bytea [] data Headers: defined by the Amqp specification Properties: contain arbitrary, application – specific, information
- 16. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 16 di 33 Amqp message propertiesAmqp message properties Content-type MIME content type Content-encoding MIME content encoding headers Message header field table Delivery-mode Non-persistent (1) or persistent (2) priority Message priority, 0 to 9 Correlation-id Application correlation identifier Reply-to Address to reply to expiration Message expiration specification Message-id Application message identifier timestamp Message timestamp type Message type name User-id Creating user id App-id Creating application id reserved Reserved, must be empty
- 17. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 17 di 33 Producer - ConsumerProducer - Consumer Producer: a program that sends messages Queus: a “buffer” where messages are stored Consumer: a program that waits to receive messages
- 18. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 18 di 33 Work queuesWork queues Work Queue: it is used to distribute tasks among multiple workers. Tasks will be shared between workers Useful in web applications where it's impossible to handle a complex task during a short HTTP request window
- 19. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 19 di 33 Publish/SubscribePublish/Subscribe Deliver a message to multiple consumers (messages are going to be broadcast to all the receivers.) The exchange must know exactly what to do with a message it receives (rules for that are defined by the exchange type)
- 20. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 20 di 33 Exchange typesExchange types Direct: the binding key must match the routing key exactly – no wildcard support Fanout: it broadcasts all the messages it receives to all the queues it knows Topic: same as Direct, but wildcards are allowed in the binding key Headers: no routing key, string matching in the message headers property
- 21. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 21 di 33 pg_amqppg_amqp Amqp client for Postgresql Allow Postgresql to communicate with other components in the architecture Stable Suggested version 9.x, but it can works too with older versions http://pgxn.org/dist/pg_amqp/ https://github.com/omnitilabs/pg_amqp
- 22. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 22 di 33 How to install pg_ampq (v0.3.0)How to install pg_ampq (v0.3.0) Wget http://api.pgxn.org/dist/pg_amqp/0.3.0/pg_amqp0.3.0.zip Cd pg_ampq0.3.0 Make Make install env PG_CONFIG=/path/to/pg_config make && make install shared_preload_libraries = 'pg_amqp.so' postgresql.conf→ CREATE EXTENSION amqp; (Postgresql >= 9.1) psql d mydb f /path/to/pgsql/share/contrib/amqp.sql (Postgresql < 9.1)
- 23. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 23 di 33 pg_amqp (v 0.4.0)pg_amqp (v 0.4.0) Only supported as a PostgreSQL Extension PG versions prior to 9.1 and means to install it without the extension system are no longer officially supported. Added support for upgrading extension installation from 0.3.0 to 0.4.0 Add support for amqp message properties (delivery_mode, content_type, reply_to and correlation_id)
- 24. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 24 di 33 SetupSetup Insert AMQP broker information into the`amqp.broker` table Insert into ampq.broker(host,port,vhost,username,password) values (localhost,'5432',null,'myuser','mypassword')
- 25. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 25 di 33 How it worksHow it works A process starts and connects to PostgreSQL and runs: SELECT amqp.publish(broker_id, 'amqp.direct', 'routingkey', 'message'); snprintf(sql, sizeof(sql), " SELECT host, port, vhost, username, password " " FROM amqp.broker " " WHERE broker_id = %d " " ORDER BY host DESC, port", broker_id);
- 26. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 26 di 33 DisconnectDisconnect In case of needing to disconnect from a specific broker select amqp.disconnect(broker_id); do nothing if it is already disconnected
- 27. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 27 di 33 PostgreSQL LISTEN ExchangePostgreSQL LISTEN Exchange A RabbitMQ exchange type that translates PostgreSQL NOTIFY messages to AMQP messages and publishes them to bound queues Require Postgresql >= 9.0 Rabbitmq plugin so unobtrusive to Postgresql environment https://github.com/aweber/pgsqllistenexchange
- 28. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 28 di 33 Installation & configurationInstallation & configuration Unzip file into your RabbitMQ plugins directory rabbitmqplugins enable pgsql_listen_exchange To connect to PostgreSQL using the default pgsql://postgres@localhost:5432/postgres Edit rabbitmq.properties [{pgsql_listen_exchange, [ {host, "localhost"}, {port, 5432}, {dbname, "postgres"}, {user, "postgres"}, {password, ""} ]} ].
- 29. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 29 di 33 Send a notifcationSend a notifcation Psql (9.4.1) postgres=# NOTIFY channel_name, 'This is a test';
- 30. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 30 di 33 Receive a notificationReceive a notification Psql (9.4.1) Postgresl=# listen channel_name
- 31. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 31 di 33 ResourcesResources http://www.rabbitmq.com http://blogs.vmware.com/vfabric/2013/02/choosingyourm http://interlinked.org/tutorials/postgresql.html
- 32. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 32 di 33 Questions?Questions?
- 33. PGDay.IT 2015 – 23 Ottobre 2015 - Prato 33 di 33