Class: RightAws::RightAWSParser

Inherits:
Object
  • Object
show all
Defined in:
lib/awsbase/right_awsbase.rb

Overview

:nodoc:

Direct Known Subclasses

AcfInterface::AcfDistributionListParser, AcwInterface::GetMetricStatisticsParser, AcwInterface::ListMetricsParser, AsInterface::DescribeAutoScalingGroupsParser, AsInterface::DescribeLaunchConfigurationsParser, AsInterface::DescribeScalingActivitiesParser, AsInterface::DescribeTriggersParser, Ec2::QEc2AllocateAddressParser, Ec2::QEc2CreateKeyPairParser, Ec2::QEc2DescribeAddressesParser, Ec2::QEc2DescribeAvailabilityZonesParser, Ec2::QEc2DescribeKeyPairParser, Ec2::QEc2DescribeRegionsParser, Ec2::QEc2DescribeSecurityGroupsParser, Ec2::RightBoolResponseParser, ElbInterface::AvailabilityZonesForLoadBalancerParser, ElbInterface::CreateLoadBalancerParser, ElbInterface::DeleteLoadBalancerParser, ElbInterface::DescribeInstanceHealthParser, ElbInterface::DescribeLoadBalancersParser, ElbInterface::HealthCheckParser, ElbInterface::InstancesWithLoadBalancerParser, RightErrorResponseParser, RightHttp2xxParser, S3Interface::S3AclParser, S3Interface::S3BucketLocationParser, S3Interface::S3CopyParser, S3Interface::S3ImprovedListBucketParser, S3Interface::S3ListAllMyBucketsParser, S3Interface::S3ListBucketParser, S3Interface::S3LoggingParser, SdbInterface::QSdbGetAttributesParser, SdbInterface::QSdbListDomainParser, SdbInterface::QSdbQueryParser, SdbInterface::QSdbQueryWithAttributesParser, SdbInterface::QSdbSelectParser, SdbInterface::QSdbSimpleParser, SqsGen2Interface::SqsCreateQueueParser, SqsGen2Interface::SqsGetQueueAttributesParser, SqsGen2Interface::SqsListQueuesParser, SqsGen2Interface::SqsReceiveMessageParser, SqsGen2Interface::SqsSendMessagesParser, SqsGen2Interface::SqsStatusParser, SqsInterface::SqsCreateQueueParser, SqsInterface::SqsGetQueueAttributesParser, SqsInterface::SqsGetVisibilityTimeoutParser, SqsInterface::SqsListGrantsParser, SqsInterface::SqsListQueuesParser, SqsInterface::SqsReceiveMessagesParser, SqsInterface::SqsSendMessagesParser, SqsInterface::SqsStatusParser

Constant Summary collapse

DEFAULT_XML_LIBRARY =

default parsing library

'rexml'
@@supported_xml_libs =

a list of supported parsers

[DEFAULT_XML_LIBRARY, 'libxml']
@@xml_lib =

xml library name: ‘rexml’ | ‘libxml’

DEFAULT_XML_LIBRARY

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params = {}) ⇒ RightAWSParser

Returns a new instance of RightAWSParser.



791
792
793
794
795
796
797
798
799
800
 
# File 'lib/awsbase/right_awsbase.rb', line 791

def initialize(params={})
  @xmlpath = ''
  @full_tag_name = ''
  @result  = false
  @text    = ''
  @tag     = ''
  @xml_lib = params[:xml_lib] || @@xml_lib
  @logger  = params[:logger]
  reset
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *params) ⇒ Object

Parser must have a lots of methods (see /usr/lib/ruby/1.8/rexml/parsers/streamparser.rb) We dont need most of them in RightAWSParser and method_missing helps us to skip their definition



867
868
869
870
871
872
873
874
 
# File 'lib/awsbase/right_awsbase.rb', line 867

def method_missing(method, *params)
    # if the method is one of known - just skip it ...
  return if [:comment, :attlistdecl, :notationdecl, :elementdecl, 
             :entitydecl, :cdata, :xmldecl, :attlistdecl, :instruction, 
             :doctype].include?(method)
    # ... else - call super to raise an exception
  super(method, params)
end

Instance Attribute Details

#full_tag_name ⇒ Object (readonly)

Returns the value of attribute full_tag_name.



788
789
790
 
# File 'lib/awsbase/right_awsbase.rb', line 788

def full_tag_name
  @full_tag_name
end

#result ⇒ Object

Returns the value of attribute result.



785
786
787
 
# File 'lib/awsbase/right_awsbase.rb', line 785

def result
  @result
end

#tag ⇒ Object (readonly)

Returns the value of attribute tag.



789
790
791
 
# File 'lib/awsbase/right_awsbase.rb', line 789

def tag
  @tag
end

#xml_lib ⇒ Object

Returns the value of attribute xml_lib.



787
788
789
 
# File 'lib/awsbase/right_awsbase.rb', line 787

def xml_lib
  @xml_lib
end

#xmlpath ⇒ Object (readonly)

Returns the value of attribute xmlpath.



786
787
788
 
# File 'lib/awsbase/right_awsbase.rb', line 786

def xmlpath
  @xmlpath
end

Class Method Details

.xml_lib ⇒ Object 



778
779
780
 
# File 'lib/awsbase/right_awsbase.rb', line 778

def self.xml_lib
  @@xml_lib
end

.xml_lib=(new_lib_name) ⇒ Object 



781
782
783
 
# File 'lib/awsbase/right_awsbase.rb', line 781

def self.xml_lib=(new_lib_name)
  @@xml_lib = new_lib_name
end

Instance Method Details

#parse(xml_text, params = {}) ⇒ Object

Parser method. Params:

xml_text         - xml message text(String) or Net:HTTPxxx instance (response)
params[:xml_lib] - library name: 'rexml' | 'libxml'



821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
 
# File 'lib/awsbase/right_awsbase.rb', line 821

def parse(xml_text, params={})
    # Get response body
  xml_text = xml_text.body unless xml_text.is_a?(String)
  @xml_lib = params[:xml_lib] || @xml_lib
    # check that we had no problems with this library otherwise use default 
  @xml_lib = DEFAULT_XML_LIBRARY unless @@supported_xml_libs.include?(@xml_lib)       
    # load xml library
  if @xml_lib=='libxml' && !defined?(XML::SaxParser)
    begin
      require 'xml/libxml'
      # is it new ? - Setup SaxParserCallback 
      if XML::Parser::VERSION >= '0.5.1.0'
        RightSaxParserCallback.include_callback 
      end           
    rescue LoadError => e
      @@supported_xml_libs.delete(@xml_lib) 
      @xml_lib = DEFAULT_XML_LIBRARY           
      if @logger
        @logger.error e.inspect
        @logger.error e.backtrace
        @logger.info "Can not load 'libxml' library. '#{DEFAULT_XML_LIBRARY}' is used for parsing." 
      end
    end
  end
    # Parse the xml text
  case @xml_lib
  when 'libxml'  
    xml        = XML::SaxParser.new 
    xml.string = xml_text 
    # check libxml-ruby version 
    if XML::Parser::VERSION >= '0.5.1.0'
      xml.callbacks = RightSaxParserCallback.new(self) 
    else 
      xml.on_start_element{|name, attr_hash| self.tag_start(name, attr_hash)} 
      xml.on_characters{   |text|            self.text(text)}
      xml.on_end_element{  |name|            self.tag_end(name)} 
    end 
    xml.parse
  else
    REXML::Document.parse_stream(xml_text, self)
  end
end

#reset ⇒ Object

the functions to be overriden by children (if nessesery)



876
 
# File 'lib/awsbase/right_awsbase.rb', line 876

def reset                     ; end

#tag_end(name) ⇒ Object 



808
809
810
811
812
 
# File 'lib/awsbase/right_awsbase.rb', line 808

def tag_end(name)
  @xmlpath = @full_tag_name[/^(.*?)\/?#{name}$/] && $1
  tagend(name)
  @full_tag_name = @xmlpath
end

#tag_start(name, attributes) ⇒ Object 



801
802
803
804
805
806
807
 
# File 'lib/awsbase/right_awsbase.rb', line 801

def tag_start(name, attributes)
  @text = ''
  @tag  = name
  @full_tag_name += @full_tag_name.empty? ? name : "/#{name}"
  tagstart(name, attributes)
  @xmlpath = @full_tag_name
end

#tagend(name) ⇒ Object 



878
 
# File 'lib/awsbase/right_awsbase.rb', line 878

def tagend(name)              ; end

#tagstart(name, attributes) ⇒ Object 



877
 
# File 'lib/awsbase/right_awsbase.rb', line 877

def tagstart(name, attributes); end

#tagtext(text) ⇒ Object 



879
 
# File 'lib/awsbase/right_awsbase.rb', line 879

def tagtext(text)             ; end

#text(text) ⇒ Object 



813
814
815
816
 
# File 'lib/awsbase/right_awsbase.rb', line 813

def text(text)
  @text += text
  tagtext(text)
end