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# Author: matt.clark@eucalyptus.com
'''
Created on May 11, 2012
@author: clarkmatthew
Simple utility to read a given config file and parse out the configuration.
Uses python's Config Parser but includes some utils to support legacy config files
To use this utility, the config file given must use the following format:
[prefix]key=value
example:
Add the following lines to a file called /tmp/config.txt
Note:
This example is using the legacy config with ip, distro, and component info.
>cat /tmp/config.txt
1.1.1.1 CENTOS 5.7 64 REPO [CLC WS]
1.1.1.2 CENTOS 5.7 64 REPO [NC00]
[mytest]
volumes=2
image=centos.img
[joestest]
image=ubuntu.img
name=joe
iterations=3
output=/tmp/joesoutput.txt
To retrieve config info from this file from within a test:
>conf = EuConfig(filename='/tmp/config.txt')
>myimage = conf.get_config('mytest','image')
>joesimage = conf.get('joestest','image')
>
>print myimage
centos.img
>print conf.legacybuf
1.1.1.1 CENTOS 5.7 64 REPO [CLC WS]
1.1.1.2 CENTOS 5.7 64 REPO [NC00]
'''
import re
import io
import ConfigParser
[docs]class EuConfig():
def __init__(self,filename='../input/2btested.lst', debugmethod=None, verbose=False):
self.filename = filename
self.verbose = verbose
#read the file into a list of lines
self.lines = self.read_config_file(filename)
#parse out any legacy config into a separate buffer
self.legacybuf = self.get_legacy_config()
#parse out remaining non-legacy config into another buffer
self.configbuf = self.get_config_buf()
#create our configParser object using the config buffer
self.config = ConfigParser.RawConfigParser()
self.config.readfp(io.BytesIO(self.configbuf))
[docs] def get(self,section,key):
return self.config.get(section,key)
[docs] def read_config_file(self,filename):
cfile = open(filename,'r')
lines = cfile.readlines()
cfile.close()
return lines
[docs] def debug(self, msg):
if self.verbose:
if self.debugmethod is not None:
self.debugmethod(str(msg))
else:
print(str(msg))
[docs] def get_legacy_config(self, lines=None):
'''
Gather all lines from the given config until a section header is reached
In order to be backwards compatible with previous configuration files
will return a buffer of file read until the first section header
'''
buf=""
if lines is None:
lines = self.lines
for line in lines:
#read file until first section header
if re.match("^\[", line):
self.debug("Found section header, returning buf")
return buf
else:
#filter out comments and blank lines
if re.match("^\s+#",line) or re.match("^\s+$",line):
self.debug("Ignoring legacy line:"+str(line))
continue
else:
self.debug("Adding line to legacy buf:"+str(line))
buf=buf+line
return buf
[docs] def get_config_buf(self,lines=None):
'''
Gather config lines into list.
To support legacy config, will exclude all lines read prior to detecting a section header.
Will ignore blank lines and lines starting with "#" representing comments
'''
buf=""
start=False
if lines is None:
lines = self.lines
for line in lines:
if re.match("^MEMO\s+", line):
line = '['+str(line).strip()+']\n'
if re.match("^END_MEMO", line):
continue
#read file until first section header
if not start:
if re.match("^\[", line):
self.debug("Found fist section header, start reading in config buff")
buf=buf+line
start=True
else:
if re.match("^\s+#",line) or re.match("^\s+$",line) or not re.search("=",line):
self.debug("Ignoring line for config buf:"+str(line))
continue
else:
self.debug("Adding line to config buff:"+str(line))
buf=buf+line
return buf