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# base.rb
#
# Copyright (C) 2008,2009 Red Hat, Inc.
# Written by Darryl L. Pierce <dpierce@redhat.com>
#
# This file is part of rubygem-cobbler.
#
# rubygem-cobbleris free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 2.1 of the License, or
# (at your option) any later version.
#
# rubygem-cobbler is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with rubygem-cobbler. If not, see <http://www.gnu.org/licenses/>.
#
require 'xmlrpc/client'
require 'pp'
require 'yaml'
module Cobbler
include XMLRPC
# +Base+ represents a remote Cobbler server.
#
# Child classes can define fields that will be retrieved from Cobbler by
# using the +cobbler_field+ method. For example:
#
# class System < Base
# cobbler_lifecycle :find_all => 'get_systems'
# cobbler_field :name
# cobbler_collection :owners, :type => 'String', :packing => :hash
# end
#
# declares a class named System that contains two fields and a class-level
# method.
#
# The first field, "name", is a simple property. It will be retrieved from
# the value "name" in the remote definition for a system, identifyed by the
# +:owner+ argument.
#
# The second field, "owners", is similarly retrieved from a property also
# named "owners" in the remote definition. However, this property is a
# collection: in this case, it is an array of definitions itself. The
# +:type+ argument identifies what the +local+ class type is that will be
# used to represent each element in the collection.
#
# A +cobbler_collection+ is packed in one of two ways: either as an array
# of values or as a hash of keys and associated values. These are defined by
# the +:packing+ argument with the values +Array+ and +Hash+, respectively.
#
# The +cobbler_lifecycle+ method allows for declaring different methods for
# retrieving remote instances of the class. These methods are:
#
# +find_one+ - the remote method to find a single instance,
# +find_all+ - the remote method to find all instances,
# +remove+ - the remote method to remote an instance
#
class Base
@@hostname = nil
@@connection = nil
@@auth_token = nil
@@debug = false
attr_accessor :definitions
def initialize(defs = nil)
@definitions = defs ? defs : Hash.new
end
# Sets the hostname for the Cobbler server, overriding any settings
# from cobbler.yml.
#
def self.hostname=(hostname)
@@hostname = hostname
end
# Sets the username for the Cobbler server, overriding any settings
# from cobbler.yml.
#
def self.username=(username)
@@username = username
end
# Sets the password for the Cobbler server, overriding any settings
# from cobbler.yml.
#
def self.password=(password)
@@password = password
end
# Enables debugging of communications.
#
def self.debug=(debug)
@@debug = debug
end
# Sets the connection. This method is only needed during unit testing.
#
def self.connection=(connection)
@@connection = connection
end
# Returns the version for the remote cobbler instance.
#
def self.remote_version
connect(false) unless @@connection
@@version ||= make_call("version")
end
# Returns a connection to the Cobbler server.
#
def self.connect(writable)
puts "Connection: writable=#{writable}" if @@debug
@@connection ||= XMLRPC::Client.new2("http://#{@@hostname}/cobbler_api")
# in pre-1.5 versions, a separate path was used for writable calls
# TODO: remove this code in 1.6 (dlp)
version = remote_version
puts "Remote version: #{version}" if @@debug
if writable &&
version < 1.5 &&
!(@@connection.instance_variable_get('@path') =~ /rw$/)
puts "Older version detected: connecting to R/W endpoint" if @@debug
@@connection = XMLRPC::Client.new2("http://#{@@hostname}/cobbler_api_rw")
end
return @@connection
end
# Establishes a connection with the Cobbler system.
#
def self.begin_transaction(writable = false)
@@connection = self.connect(writable)
end
# Logs into the Cobbler server.
#
def self.login
(@@auth_token || make_call('login', @@username, @@password))
end
# Makes a remote call.
#
def self.make_call(*args)
raise Exception.new('No connection established.') unless @@connection
puts "Remote call: #{args.first}" if @@debug
result = @@connection.call(*args)
puts "Result: #{result}\n" if @@debug
return result
end
# Ends a transaction and disconnects.
#
def self.end_transaction
@@connection = nil
@@auth_token = nil
@@version = nil
end
class << self
# Creates a complete finder method
#
def cobbler_lifecycle(*args)
methods = args.first
methods.keys.each do |key|
method = methods[key]
case key
when :find_all then
module_eval <<-"end;"
def self.find(&block)
begin
begin_transaction
records = make_call('#{method}')
ensure
end_transaction
end
result = Array.new
if records
records.each { |record| result << create(record) }
end
result.each { |system| yield(system) } if block
return result
end
end;
when :find_one then
module_eval <<-"end;"
def self.find_one(name, flatten = false)
begin
begin_transaction
record = make_call('#{method}',name,flatten)
ensure
end_transaction
end
return create(record) unless record.keys.empty?
return nil
end
end;
when :remove then
module_eval <<-"end;"
def remove
begin
Base.begin_transaction(true)
token = Base.login
result = Base.make_call('#{method}',name,token)
ensure
Base.end_transaction
end
result
end
end;
end
end
end
# Allows for dynamically declaring fields that will come from
# Cobbler.
#
def cobbler_field(field,*args) # :nodoc:
if args
for arg in args
for key in arg.keys
case key
when :findable then
module_eval <<-"end;"
def self.find_by_#{field.to_s}(value,&block)
properties = make_call('#{arg[key]}',value)
return create(properties) if properties && !properties.empty?
return nil
end
end;
end
end
end
end
module_eval("def #{field}() @definitions['#{field.to_s}']; end")
module_eval("def #{field}=(val) @definitions['#{field.to_s}'] = val; end")
end
# Allows a field to be defined as a collection of objects. The type for that
# other class must be provided.
#
def cobbler_collection(field, *args) # :nodoc:
classname = 'String'
packing = 'Array'
# process collection definition
args.each do |arg|
classname = arg[:type] if arg[:type]
if arg[:packing]
case arg[:packing]
when :hash then packing = 'Hash'
when :array then packing = 'Array'
end
end
end
module_eval <<-"end;"
def #{field.to_s}(&block)
unless @#{field.to_s}
@#{field.to_s} = #{packing}.new
values = @definitions['#{field.to_s}']
case "#{packing}"
when "Array" then
values.each do |value|
@#{field.to_s} << #{classname}.new(value)
end
when "Hash" then
values.keys.each do |key|
@#{field.to_s}[key] = #{classname}.new(values[key])
end
end
end
@#{field.to_s}
end
def #{field.to_s}=(replacement)
@#{field.to_s} = replacement
end
end;
end
end
end
end
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