GBSConfig.py

Go to the documentation of this file.

class GBSConfig:
    """ The class responsible for loading configuration data at program start

    It first reads it's internal configuration file and then looks for external ones.
    After that it's just a dictionary"""

    def __init__(self):
        """ Search for the configuration files (internal and external) and assemble a dictionary"""

        self.__config = {}

        import os

        #  Read its own internal configuration
        rcFile = os.path.expandvars("$GBS_HOME/python/.gbsrc")
        if os.path.isfile(rcFile):
            self.__ReadConfigFile(rcFile)
        else :
            print "ERROR: Unable to locate configuration file " + str(rcFile)
            raise ConfigurationMissingError

        #  Read external configuration
        rcFile = os.path.expanduser("~/.gbsrc")
        if os.path.isfile(rcFile):
            self.__ReadConfigFile(rcFile)

        rcFile = os.path.expandvars("$GBS_CONFIG_PATH")
        if os.path.isfile(rcFile):
            self.__ReadConfigFile(rcFile)

    def GetValue(self,key):
        if self.__config.has_key(key): return self.__config[key]
        return ""
    
    def __ReadConfigFile(self,rcFile):
        """ Read configuration files into dictionary.  """


        print "GBSConfig: Reading configuration from " + str(rcFile) + " ... ",
        f=open(rcFile)

        import re
        num_line = 0
        for line in f:
            num_line = num_line + 1
            # Skip blank lines and comments
            if re.search(r"^\s*$",line): continue
            if re.search(r"^\s*#",line): continue
            # Look for key vaule pairs
            mo = re.search(r"^(\S+)\s+(.+?)\s*$",line)
            if mo :
                (key,value) = mo.groups()
                self.__config[key] = value
            else :
                print "Bad data on line " + str(num_line) + " of file " + str(rcFile),
                print ":" + str(line)
        print str(num_line) + " lines" 

#  Singleton object with getter.

__config = GBSConfig()

def GetConfig(): return __config

def GetConfigValue(key): return GetConfig().GetValue(key)

---