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Symfony2 + RabbitMQ + Supervisord + Jenkins auto consumers setup

In Capitalise.com we use RabbitMQ as queue system for async tasks and php-amqplib/rabbitmq-bundle in a Symfony app to consume those messages from RabbitMQ.

Aiming to automate all the steps of the deploy we needed a way to auto setup any new consumer, ideally in the jenkins deployment job.

For this, we took advantage of Symfony console to get the list of available consumers and using a template consumer with supervisord we setup all the new consumers.

Setting up the environment

We start by setting up the environment for the deployment, for this we set some environment variables as shown:

# PHP bin path
PHP=php

# Deploy environment
SYMFONY_ENVIRONMENT=prod
DEPLOYMENT_ENVIRONMENT=production

# Symfony project path (should be updated for Symfony3)
APPLICATION_PATH=/path/to/your/symfony/app
APPLICATION_CONSOLE=${APPLICATION_PATH}/app/console

# Path for supervisord configurations
SUPERVISORD_CONF_DIR=/etc/supervisor/conf.d
SUPERVISORD_LOG_DIR=/var/log/supervisor
SUPERVISORD_PREFIX=supervisord-${DEPLOYMENT_ENVIRONMENT}-
SUPERVISORD_SUFFIX=.conf
SUPERVISORD_USER=apache

# Consumers file name configuration
PROGNAME_PREFIX=${DEPLOYMENT_ENVIRONMENT}.projectname.app.consumers.
PROGNAME_SUFFIX=

Create the consumers

With the environment ready for the consumers configuration, we have a post build task on jenkins which will fetch the list of consumers from the Symfony app and run the script that will generate the consumers configuration.

# Current list of consumers
CONFIGURATION_FILE_LIST=$(find ${SUPERVISORD_CONF_DIR} -type f -name "${SUPERVISORD_PREFIX}*" -name "*${SUPERVISORD_SUFFIX}");

# Consumers listed in the Symfony App
CONSUMER_LIST="$(${PHP} ${APPLICATION_CONSOLE} platfi:rabbitmq:consumers --env=${SYMFONY_ENVIRONMENT})";


# Remove all the configuration files for the current environment.
for CONFIGURATION_FILE in ${CONFIGURATION_FILE_LIST};
do
    echo "Removing configuration file ${CONFIGURATION_FILE#$SUPERVISORD_CONF_DIR/}";
    rm ${CONFIGURATION_FILE};
done

# Re-generate all the configuration files for the current environment.
for CONSUMER_NAME in ${CONSUMER_LIST};
do
    CONF_FILE="${SUPERVISORD_PREFIX}${CONSUMER_NAME}${SUPERVISORD_SUFFIX}";

    echo "Creating configuration file ${CONF_FILE}";
    cat > "${SUPERVISORD_CONF_DIR}/${CONF_FILE}" <<EOF
# Configuration generated automatically
# DO NOT CHANGE - Will be updated on each deployment
[program:${PROGNAME_PREFIX}${CONSUMER_NAME}${PROGNAME_SUFFIX}]
user=${SUPERVISORD_USER}
command=${PHP} -dmemory_limit=128M ${APPLICATION_CONSOLE} rabbitmq:consumer -w ${CONSUMER_NAME} --env=${SYMFONY_ENVIRONMENT}
process_name=worker-%(process_num)02d
numprocs=1
autostart=true
autorestart=true
log_stdout=true
redirect_stderr=true
stdout_file=${SUPERVISORD_LOG_DIR}/${DEPLOYMENT_ENVIRONMENT}-${CONSUMER_NAME}-%(process_num)02d
stdout_logfile_maxbytes=20MB
stdout_logfile_backups=5
EOF

done

# Update supervisor with the new configuration
supervisorctl update all;

# Restart consumers one by one (consumers that have not changed will not be restarted with the command above)
for CONSUMER_NAME in ${CONSUMER_LIST};
do
    supervisorctl restart ${PROGNAME_PREFIX}${CONSUMER_NAME}${PROGNAME_SUFFIX}:*;
done

Finally we restart supervisord and we're good to go :)

Contributors

@tiagoblackcode