[[PageOutline(2-5,Contents,pullout)]] = Trac Cron Plugin = == Description == This plugin add a scheduler inside Trac process that can handle any sort of task writing in python language. Main features are: * Task are plugin * Bundled out-of-the-box task * Scheduler are plugin * Bundled out-of-the-box scheduler * Listener mechanisme to be notified of task execution * Bundled out-of-the-box listener * Task execution history The plugin provide an administration panel to help scheduling. [[Image(tcp_admin_panel.png, 640)]] == Bugs/Feature Requests == Existing bugs and feature requests for TracCronPlugin are [report:9?COMPONENT=TracCronPlugin here]. If you have any issues, create a [http://trac-hacks.org/newticket?component=TracCronPlugin&owner=tbressure new ticket]. == Download == === Lastest release === Current stable release is '''0.1''' You can use easy_install to download the latest egg into your python environment {{{ easy_install TracCronPlugin }}} or download distributions files at [http://pypi.python.org/pypi/TracCronPlugin/0.1 pypi] (egg, binary and source) === Latest source === Download the latest trunk zipped source from [download:traccronplugin here]. == Source == You can check out TracCronPlugin from [http://trac-hacks.org/svn/traccronplugin here] using Subversion, or [source:traccronplugin browse the source] with Trac. == Example == My company need to synchronize trac user with an external source of account. The job was made by an ETL but fine tuning of trac user was still done by a our modified version of Trac by clicking on a button on the admin panel that call a well designed API. So instead of manually clik on the button i searched a way to automate it. Unfortunately, i did not find any plugin for this and even if i could use a unix cron task or an windows AT command to plane the task, i thought it would be better done inside Trac process. So if you have any function for entry point of a process (i mean trac related process) and you want to plane it as a job, Trac Cron Plugin is for you. Simply create in a module (.py) a class that implement the ICronTask and put it inside plugins directory. Then you can either trick the trac.ini either comfortably use the dedicated admin panel. === How to write a task === You have to write python class that inherit of ICronTask which code is below: {{{ #!python class ICronTask(Interface): """ Interface for component task """ def wake_up(self, *args): """ Call by the scheduler when the task need to be executed """ raise NotImplementedError def getId(self): """ Return the key to use in trac.ini to configure this task """ raise NotImplementedError def getDescription(self): """ Return the description of this task to be used in the admin panel. """ raise NotImplementedError }}} Let's take a look at the heartbeat task packed with TracCronPlugin: {{{ #!python class HeartBeatTask(Component,ICronTask): """ This is a simple task for testing purpose. It only write a trace in log a debug level """ implements(ICronTask) def wake_up(self, *args): if len(args) > 0: for arg in args: self.env.log.debug("Heart beat: " + arg) else: self.env.log.debug("Heart beat: boom boom !!!") def getId(self): return "heart_beat" def getDescription(self): return self.__doc__ }}} You need to implements the interface and to put the definition of the task inside the '''wake_up''' method === How to install the task === Since task are component you just have to put the class definition of your task in a python module in plugins directory. You can either create a .py file and put it in plugins directory or package the .py file into an eggs you'll leave in plugins directory. TracCronPlugin will show up the task in it administration panel. Enjoy ! == Configuration == The plugin can entirely be configured both witn trac.ini or administration panel. The section name of TracCronPlugin is traccron, here is a full sample {{{ #!ini [traccron] ticker_enabled = True ticker_interval = 1 heart_beat.daily = 21h19, 21h20 heart_beat.daily.enabled = True hear_beat_daily.arg = Good Morging heart_beat.enabled = True heart_beat.hourly = 17, 18 heart_beat.hourly.enabled = False heart_beat.monthly = 15@21h15, 15@21h16 heart_beat.monthly.enabled = False heart_beat.weekly = 4@21h28, 4@21h29 heart_beat.weekly.enabled = False }}} === Global setting === {{{ #!ini ticker_enabled = True }}} This control the object called ticker which is the thread that launch tasks. If False, no ticket (no thread) is created so your Trac is merely like no cron is installed. This is the more global setting you can act on to enable or disable ALL task. Default value is '''True'''. {{{ #!ini ticker_interval = 1 }}} This key control the interval between each wake up of the ticker. The ticker thread periodically wake up to see if there is task to execute. Then the ticker thread go sleep for the amount of minutes specified by this key. You should not have modify this value except if you have system load issue. Default value is '''1'''. === Task setting === For each task loaded by Trac Component manager, Trac Cron Plugin have those parameters. Let's look at hear beat task: ==== Enable/Disable a task ==== {{{ #!ini heart_beat.enabled = True }}} This is the second way to enable or disable a task. Since ''ticker_enabled'' is global and so all task will be affected, this key only affect one task. If False, wathever schedule the task have, no one will be trigged, so this is a way to disable a task while keep all the schedule in place for the time you will enable the task. Default is '''True'''. ==== Task scheduling ==== {{{ #!ini heart_beat.daily = 21h19, 21h20 }}} This control the daily scheduler. As this name suggest, it trigger the task every day. You need to provide time you want the task to execute. You can give a comma separated list to trigger the task at multiple time everyday. Default is no value. {{{ #!ini heart_beat.hourly = 17, 18 }}} The goal of this scheduler is to trigger task every hours. You provode minute when you want the task to be executed. Accept comma sparated list of values. Default is no value. {{{ #!ini heart_beat.monthly = 15@21h15, 15@21h16 }}} This sceduler trigger task that need to be executed once a month. You provide the day in month and the hour when the task will be launched. The day is the index of the day starting at 1. Accept comma separated value. Default is no value {{{ #!ini heart_beat.weekly = 4@21h28, 4@21h29 }}} This sceduler trigger task that need to be executed once a week. You provide the day in week and the hour when the task will be launched. The day is the index of the day starting at 0 (Monday is 0). Accept comma separated value. Default is no value ==== Enable/Disable a schedule ==== Each schedule can individualy be enabled or disabled. This the configuration for daily scheduler: {{{ #!ini heart_beat.daily.enabled = True }}} This enable or disable the trigger. If False, the scheduler will not trigger the task. Default is '''True'''. ==== Pass argument to a task ==== You can pass argument to the task in a per schedule basis. Here an example for daily schedule: {{{ #!ini hear_beat_daily.arg = Good Morging }}} When the daily schedule will trigger the task, the value of the key will be passed to the '''wake_up''' call. Parameters can be coma separated multiple value. Default is '''empty''' == Bundled Task == Beside the HearBeat task provided for testing purpose, TracCronPlugin come with following useful task. === sleeping_ticket === This task remind reporter about orphaned ticket and assigned user about sleeping ticket. Orphaned ticket is a ticket in new status since more than a given amount of day. An email notification is sent to the reporter in such a case. A sleeping ticket is a ticket assigned to an user, but the user either did not accept it or did not touch the ticket(make comment for example) since more than a given amount of day. The assigned user is notified in such a case. The delay is an optional parameter associated with each schedule. Default value is '''3 day'''. === unreachable milestone === '''Note''': Since 0.2dev_r9388 This task scan still opened tickets in near milestone. Such a situation means that those tickets will probably not be part of the milestone. The task send a mail to user defined with ''unreachable_milestone.recipient'' (default is '''empty''') for each milestone with the list of still opened tickets. You may want to set the value to the release manager user. Reporter and owner are notified too but only for their tickets. The task looks for near milestone until '''3 days ahead'''. You can change the value with parameter either by setting ''unreachable_milestone..arg'' or in admin panel. This is an example of the mail for release manager: {{{ Hello, The milestone milestone1 is near to be closed. Its due date is 11-30-2010. Unfortunately we have detected some still opened ticket. Please consider to postpone them or ensure they will meet the milestone due date. These ticket are testing ticket http://localhost:8000/dummy/ticket/1 testing ticket http://localhost:8000/dummy/ticket/3 Best regard. -- My Project My example project }}} === Auto postpone task === '''note''': since 0.2dev_r9390 Trac allow the administrator to postpone still opened ticket in a given milestone when he close a this milestone. But this is not mandatory. The auto postpone task will help to not forget opened tickets in closed milestone. The task look for such tickets and postpone them in the more recent still opened milestone (milestone must have a due date) == Bundled Scheduler == === Hourly scheduler === See task scheduling section. === Daily scheduler === See task scheduling section. === Weekly scheduler === See task scheduling section. === Monthly scheduler === See task scheduling section. === Cron Scheduler === Since 0.2dev_r9375 there is a cron scheduler. You can use cron syntaxe to define the schedule. Currenlty you can use * single value * range value both with - or / special character * special value * example with ''heart_beat'' task {{{ #!ini heart_beat.cron = * 0/2 * * * ? * }}} '''warning''' : since TracCronPlugin ticker interval is at least one minute, this means the seconds cannot be specified and so the first item of the cron expression is useless. Please refer to cron documentation for more details [http://en.wikipedia.org/wiki/CRON_expression cron syntax ] == Bundled Listener == === Email notification of task event === This listener notify by email about task execution. You can choose the number of event sent by email by setting the value of ''email_task_event.limit''. When the listener has received at least the number of task execution,it will send the mail. Default is '''1'''. The value of ''email_task_event.recipient'' '''must''' be filled otherwise no mail will be sent. Here the configuration for this listener {{{ #!ini email_task_event.enabled = True email_task_event.limit = 1 email_task_event.recipient = admin }}} Here an sample of the email : {{{ The above task has been run by Trac Cron Plugin task[heart_beat] started at 0 h 47 ended at 0 h 47 success task[heart_beat] started at 0 h 48 ended at 0 h 48 success task[heart_beat] started at 0 h 49 ended at 0 h 49 success }}} Since 0.2dev_r9385 you can use ''email_task_event.only_error = True'' to send email only on error. == Recent Changes == [[ChangeLog(traccronplugin, 3)]] == Author/Contributors == '''Author:''' [wiki:tbressure] [[BR]] '''Maintainer:''' [wiki:tbressure] [[BR]] '''Contributors:'''