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#
# Author:: Adam Edwards (<adamed@chef.io>)
# Copyright:: Copyright 2014-2019 Chef Software, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require "win32ole" if RUBY_PLATFORM =~ /mswin|mingw32|mingw|windows/
require_relative "wmi_instance"
require_relative "wmi_exception"
module WmiLite
class Wmi
def initialize(namespace = nil)
@namespace = namespace.nil? ? "root/cimv2" : namespace
@connection = nil
end
def query(wql_query)
query_with_context(wql_query)
end
def instances_of(wmi_class)
query_with_context("select * from #{wmi_class}", wmi_class)
end
def first_of(wmi_class)
query_result = start_query("select * from #{wmi_class}", wmi_class)
first_result = nil
query_result.each do |record|
first_result = record
break
end
first_result.nil? ? nil : wmi_result_to_snapshot(first_result)
end
private
def query_with_context(wql_query, diagnostic_class_name = nil)
results = start_query(wql_query, diagnostic_class_name)
result_set = []
results.each do |result|
result_set.push(wmi_result_to_snapshot(result))
end
result_set
end
def start_query(wql_query, diagnostic_class_name = nil)
result = nil
connect_to_namespace
begin
result = @connection.ExecQuery(wql_query)
raise_if_failed(result)
rescue WIN32OLERuntimeError => native_exception
raise WmiException.new(native_exception, :ExecQuery, @namespace, wql_query, diagnostic_class_name)
end
result
end
def raise_if_failed(result)
# Attempting to access the count property of the underlying
# COM (OLE) object will trigger an exception if the query
# was unsuccessful.
result.count
end
def connect_to_namespace
if @connection.nil?
namespace = @namespace.nil? ? "root/cimv2" : @namespace
locator = WIN32OLE.new("WbemScripting.SWbemLocator")
begin
@connection = locator.ConnectServer(".", namespace)
rescue WIN32OLERuntimeError => native_exception
raise WmiException.new(native_exception, :ConnectServer, @namespace)
end
end
end
def wmi_result_to_snapshot(wmi_object)
snapshot = Instance.new(wmi_object)
end
end
end
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