Job Management (Tripal Daemon)

Note

Remember you must set the $DRUPAL_HOME environment variable to cut-and-paste the commands below. See see DRUPAL_HOME Variable

The Tripal Daemon module is meant to provide a simple means of creating a robust command-line-driven, fully bootstrapped PHP Daemon. It uses the PHP-Daemon (https://github.com/shaneharter/PHP-Daemon) Library to create the Daemon (via the Libraries API) in order to not re-invent the wheel. It allows you to execute Jobs submitted to Tripal without using cron. It provides a faster user experience for running jobs. Prior to Tripal v3, the Tripal Daemon module was an extension module. It was integrated into the core Tripal pacakge.

Features

  • Provides a Drush interface to start/stop your Daemon.
  • Your daemon starts in the background and is detached from the current terminal.
  • Daemon will run all Tripal Jobs submitted within 20 seconds.
  • A log including the number of jobs executed, their identifiers and results.
  • Lock Files, Automatic restart (8hrs default) and Built-in Signal Handling & Event Logging are only a few of the features provided by the Daemon API making this a fully featured & robust Daemon.

Installation

The Tripal Daemon requires the Libraries API module. You can easily download and install this module using the following drush commands:

drush pm-download Libraries
drush pm-enable Libraries

Next, we need the PHP-Daemon Library version 2.0. You must download the PHP-Daemon Library and extract it in your sites/all/libraries directory. The folder must be named “PHP-Daemon”. The following commands can be used to do this:

cd $DRUPAL_HOME/sites/all/libraries
wget https://github.com/shaneharter/PHP-Daemon/archive/v2.0.tar.gz
tar -zxvf v2.0.tar.gz
mv v2.0.tar.gz PHP-Daemon

Next, install the Drush Daemon API module.

drush pm-download drushd
drush pm-enable drushd

Finally, enable the Tripal Daemon module. This module comes with Tripal v3.

drush pm-enable tripal_daemon

Usage

Start the Daemon

drush trpjob-daemon start

Stop the Daemon

drush trpjob-daemon stop

Check the status

drush trpjob-daemon status

List the last 10 lines of the log file:

drush trpjob-daemon show-log

List the last N lines of the log file:

drush trpjob-daemon show-log --num_lines=N

Set N to the number of lines you want to view.