To make the script for many environments, we will need a configuration file that contains specific environment's app information.
I prefer to make it in MS .INI file format. We will need some sections like environment, hibernate.cfg.xml, web.xml, ehcache.xml... such as:
[environment]
tomcat-folder = /var/lib/tomcat6
tomcat-user = tomcat6
[hibernate.cfg.xml] hibernate.connection.url = jdbc:postgresql://dbserver:5432/app
hibernate.connection.username = username
hibernate.connection.password = password [web.xml]
data1 = abc
Data2 = xyz
import sys, os, datetime, shutil, copy, ConfigParser
from xml.etree import ElementTree as ET
app = sys.argv[1]
deployFolder = os.path.dirname(os.path.realpath(__file__)) + '/'
config = ConfigParser.ConfigParser()
config.optionxform = str #preserve case-sensitive
config_file = app + '.cfg'
config.read(deployFolder + config_file)
tomcatFolder = config.get('environment', 'tomcat-folder')
appFolder = tomcatFolder + '/webapps/' + app Then parse .xml configuration and update them
#parse web.xml section into dictionary
webXMLdic = dict(config.items('web.xml'))
#parse the app web.xml
webXMLfile = appFolder + '/WEB-INF/web.xml'
webXML = ET.parse(webXMLfile)
for param in webXML.getroot().getiterator('context-param'):
name = param.find('param-name')
value = param.find('param-value')
if webXMLdic.has_key(name.text):
new_value = webXMLdic.get(name.text)
value.text = new_value
else:
print 'not found value for param ' + name.text + ' in ' + config_file
#update the app web.xml
with open(webXMLfile, 'w') as f:
f.write('<?xml version="1.0" encoding="UTF-8"?>\n' \
'<!DOCTYPE web-app \nPUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" \n' \
'"http://java.sun.com/dtd/web-app_2_3.dtd">\n')
ET.ElementTree(webXML.getroot()).write(f,'utf-8')
#parse hibernate.cfg.xml section into dictionary
hibernateXMLdic = dict(config.items('hibernate.cfg.xml'))
#parse the app hibernate.cfg.xml
hibernateXML = ET.parse(hibernateXMLfile)
hibernateXMLfile = appFolder + '/WEB-INF/classes/hibernate.cfg.xml'
#the XPath selector functionality was not implemented in ElementTree until version 1.3, which ships with Python 2.7, so I use iterator loop to work for lower Python versions
for property in hibernateXML.getroot().getiterator('property'):
name = property.get('name')
if hibernateXMLdic.has_key(name):
new_value = hibernateXMLdic.get(name)
property.text = new_value
print name, new_value
if (name == 'hbm2ddl.auto'): #remove update/create db if it's declared
hibernateXML.getroot().find('session-factory').remove(property)
#update the app hibernate.cfg.xml
with open(hibernateXMLfile, 'w') as f:
f.write('<!DOCTYPE hibernate-configuration PUBLIC \n' \
'"-//Hibernate/Hibernate Configuration DTD 3.0//EN" \n' \
'"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">\n')
ET.ElementTree(hibernateXML.getroot()).write(f)
We will need other functions such as extract the war file, copy/backup..., but they are simple things to do with Python.
