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Wednesday, August 25, 2010

Get Options for command line in WLST script

Problem Statement

Required a Python script for check if the WebLogic admin server is 'Running' or Not recursively
To execute this you have 2 options
1. Executing forever
2. timeout, interval as aruguments

If it isn't keep checking forever or as long as is passed on the command- line with the -t parameter. The wait between checks can be modified with the -i parameter on the command line.

There could be your environemnt also need such options for a Python script. This script will be a example for such requirements.

Script Logic
Hey Smart WLAs what do you think the solution for the above problem statement?? Got any idea? I know you guys are very intelligents!! hope you got idea about getting options at command-line. Yes, it is possible for our WLST Script too, getopt is a python capability which allows us to accept the command line arguments with options -t, -i. Of-course my buddy struggle to find this clues on the Google almost took 2 days.
  1. To read the command line values as dictionary and split as key, value pair and compare the key with desired options then performing the script according to user choice.
  2. If the user failed to enter the options at commandline exception handling with usage funcation.
  3. WLST connect to admin server regular function.
  4. Using sleep method for stopping the WLST execution for some time interval. Repeating this process till given timeout or run this above steps for forever.


#!/usr/bin/python
# Author : Raghunath
# Save Script as : checkAdmin.py 

import time
import getopt
import sys

# ========= connecting to Admin server ==================
def connectAdmin():
   r=1
   try:
        # Update the following line as per your environment
        connect(url='t3://AdminHost:AdminPort')
        print "*** Connected sucessesfully ***"
        r=0
        sys.exit(r)
    except:
        return r
 
def usage():
    print "Usage:"
    print "checkAdmin.py [-t timeout] [-i interval]"
    print "exit with 0 if find Admin Server"
    print "exit with 1 if do not find Admin Server"
    print "if no timeout is given, look for Admin Server until it is found"


# ===== Default settings ===================
Timeout = 0 
Interval = 25000
forever = 1

#====== Main program ===============================
try:
    opts, args = getopt.getopt( sys.argv[1:], "t:i", ["Timeout","Interval"] )
except getopt.GetoptError, err:
    print str(err)
    usage()
    sys.exit(2)

#===== Handling get options  ===============
for opt, arg in opts:
    if opt == "-t":
        Timeout = arg
        forever = 0
    elif opt == "-i":
        Interval = arg

while (forever == 1) or  (Timeout > 0):
     if connectsave() == 1:
         print 'Now, Sleeping  15 sec *************'
         java.lang.Thread.sleep( Interval )
         print 'Waking up after 15 sec ...'
     
      
print 'done'



To run the above script you can make a small shell script as follows:
# checkAdmin.sh

. $WL_HOME/server/bin/setWLSEnv.sh
java weblogic.WLST checkAdmin.py "$@"

Run this shell script as :
$ checkAdmin.sh -t 100 -i 20

or you call directly python script as follows
$ java weblogic.WLST checkAdmin.py -t 100 -i 20

Note that indentation is must for every Python script, please double check before you run the script.
Write back for any issues ariases when you execute the script in your environment.
Referneces:

# email functionality base on http://docs.python.org/library/email-examples.html

Tuesday, August 24, 2010

Configuring Multi DataSource

Introducing Problem Statement for this post is WLST which enables us to configure any kind of resource on a WebLogic domain. Here I am with new attempt to configuring Multi Datasource. In most of new domain configurations you need to work separately for configuring Datasource. We are already seen how to configure a Dynamic Datasource with customized property file, Adding to the same topic now we are going to work on Multi Datasource configuration.

The steps involved in multi datasource confiuration are as follows:
1. Configure individual datasource
2. Configure a new multidatasource
3. Add the datasources created in steip 1

Keeping more flavor (Object-Orientation) to your script we will create a Class in WLST this time. Are you ready??? I know you guys very intelligents and know all WLST tricks how they works and all!! Lets dive into the process of configuration.
-->


#==========================================
# File name: ConfigMDS.py
# Please change the code (line 38) as per your environment and needs
# Author : Inteligent WLA :)
#=============================================

class MDS:          
 def __init__(self, nam):
  self.nam  = nam 

 def configMDS(self):
  n=self.nam
  try:
   cd('/')
   cmo.createJDBCSystemResource(n)
   cd('/JDBCSystemResources/'+n+'/JDBCResource/'+n)
   cmo.setName(n)
   cd('JDBCDataSourceParams/'+n)
   set('JNDINames',jarray.array([String(n)], String))
 
   cmo.setAlgorithmType('Failover')
   dslist=raw_input('Please enter comma separating Datasources for MDS:')
   cmo.setDataSourceList(dslist)
   cd('/JDBCSystemResources/'+n)
   targetType=raw_input('Target to (C)luster or (S)erver: ')
   if targetType in ('C','c') :
           clstrNam=raw_input('Cluster Name: ')
               set('Targets',jarray.array([ObjectName('com.bea:Name='+clstrNam+',Type=Cluster')], ObjectName))
          else:
               servr=raw_input('Server Name: ')
               set('Targets',jarray.array([ObjectName('com.bea:Name='+servr+',Type=Server')], ObjectName))
   print 'Succesfully configured MultiDataSource...'
   activation()
  except BeanAlreadyExistsException:
   print 'Error: '+n+' BeanAlreadyExists...'
       cancelEdit('y')
   exit()

#===== main program===============
if __name__== "main":
 connect('wlusr','paswd','t3://AdminUrl:AdminPort')
 edit()
 startEdit()
 
 mdsName = raw_input("Please enter MultiDataSource name: ")
  # create object, call configMDS
 MDS(mdsName).configMDS()
 print('Exiting...')
 exit() 

Here you can templatise more by creating the a properties file where you need to store Multidatasoruce name, JNDIName, WebLogic Admin user, Password, AdminURL, the datasource names you wish to add to the multidatasource.

Use the same steps as followed in the Generic Data Source Creation.

# http://unni-at-work.blogspot.com/2009/03/multi-data-source-using-wlst.html
# http://edocs.bea.com/wls/docs100/wlsmbeanref/mbeans/JDBCDataSourceParamsBean.html#AlgorithmType

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