host.py

gistfile1.txt

## ToDo 
## validation for app_hosts - DONE
## valid fqdn or ip -
## minmal number of hosts is 3
## can handle both space seperated and comma seperated
## Single cluster scenarios : app_hosts == avail_hosts

## Multi cluster : avail_hosts = app_hosts + other_hosts
## All hosts need to be unique 
import re
import os

min_hosts = 3

class StorageHosts():
	'''
	callable methods and validation of the hosts
	'''
	def __init__(hostname=None, avail_hosts=None, raw_devices=None):
		self.app_hosts = app_hosts
		self.avail_hosts = avail_hosts
                self.raw_devices = raw_devices

	def is_valid_hostname(hostname):
		 if len(hostname) > 255:
        		return False

        def host_not_valid(app_hosts):
            for ahosts in app_hosts:
                if  is_valid_hostname(ahosts) == True:
                    continue
                else:
                    print "\033[91m %s \033[0m is not valid hostname" % ahosts
                    exit()

        def min_hosts(app_hosts):
            if len(app_hosts) < 3:
                print "\033[91m Require a minimum of 3 hosts \033[0m"
                exit()


        def host_in_use(log_hosts):
            for lhosts in log_hosts:
                if is_valid_hostname(lhosts) == True and lhosts not in app_hosts:
                    continue
                elif is_valid_hostname(lhosts) == True and lhosts in app_hosts:
                    print "Host: \033[91m %s \033[0m is already used for application hosting" % lhosts
                    exit()
                else:
                    print "\033[91m %s \033[0m is not valid hostname" % lhosts
                    exit()

        def met_in_use(met_hosts):
            for hosts in met_hosts:
                if is_valid_hostname(hosts) == True and hosts not in app_hosts:
                    continue
                elif is_valid_hostname(hosts) == True and hosts in app_hosts:
                    print "Host: \033[91m %s \033[0m is already used for application hosting" % hosts
                    exit()
                else:
                    print "\033[91m %s \033[0m is not valid hostname" % hosts
                    exit()

        def check_input(no_of_hosts):
            hosts_found = re.split(r'[,\s?]', no_of_hosts)
            hosts = [host for host in hosts_found if host]
            return hosts