Class: Aws::AwsParser

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

Overview

:nodoc:

Direct Known Subclasses

Aws::AcfInterface::AcfDistributionConfigParser, Aws::AcfInterface::AcfDistributionListParser, Aws::AcfInterface::AcfDistributionParser, Ec2::QEc2AllocateAddressParser, Ec2::QEc2AttachAndDetachVolumeParser, Ec2::QEc2BundleInstanceParser, Ec2::QEc2ConfirmProductInstanceParser, Ec2::QEc2CreateKeyPairParser, Ec2::QEc2CreateSnapshotParser, Ec2::QEc2CreateVolumeParser, Ec2::QEc2DescribeAddressesParser, Ec2::QEc2DescribeAvailabilityZonesParser, Ec2::QEc2DescribeBundleTasksParser, Ec2::QEc2DescribeImageAttributeParser, Ec2::QEc2DescribeImagesParser, Ec2::QEc2DescribeInstancesParser, Ec2::QEc2DescribeKeyPairParser, Ec2::QEc2DescribeRegionsParser, Ec2::QEc2DescribeSecurityGroupsParser, Ec2::QEc2DescribeSnapshotsParser, Ec2::QEc2DescribeVolumesParser, Ec2::QEc2GetConsoleOutputParser, Ec2::QEc2MonitorInstancesParser, Ec2::QEc2RegisterImageParser, Ec2::QEc2TerminateInstancesParser, Ec2::RightBoolResponseParser, Elb::QElbCreateParser, Elb::QElbDeleteParser, Elb::QElbDescribeInstancesHealthParser, Elb::QElbDescribeLoadBalancersParser, Elb::QElbRegisterInstancesParser, Mon::QMonGetMetricStatistics, Mon::QMonListMetrics, RightErrorResponseParser, RightHttp2xxParser, S3Interface::S3AclParser, S3Interface::S3BucketLocationParser, S3Interface::S3CopyParser, S3Interface::S3ImprovedListBucketParser, S3Interface::S3ListAllMyBucketsParser, S3Interface::S3ListBucketParser, S3Interface::S3LoggingParser, SdbInterface::QSdbDomainMetadataParser, SdbInterface::QSdbGetAttributesParser, SdbInterface::QSdbListDomainParser, SdbInterface::QSdbQueryParser, SdbInterface::QSdbQueryWithAttributesParser, SdbInterface::QSdbSelectParser, SdbInterface::QSdbSimpleParser, SqsInterface::SqsCreateQueueParser, SqsInterface::SqsGetQueueAttributesParser, SqsInterface::SqsListQueuesParser, SqsInterface::SqsReceiveMessageParser, 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 = {}) ⇒ AwsParser

Returns a new instance of AwsParser.



728
729
730
731
732
733
734
735
 
# File 'lib/awsbase/right_awsbase.rb', line 728

def initialize(params={})
    @xmlpath = ''
    @result = false
    @text = ''
    @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 AwsParser and method_missing helps us to skip their definition



809
810
811
812
813
814
815
816
 
# File 'lib/awsbase/right_awsbase.rb', line 809

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

#result ⇒ Object

Returns the value of attribute result.



724
725
726
 
# File 'lib/awsbase/right_awsbase.rb', line 724

def result
  @result
end

#xml_lib ⇒ Object

Returns the value of attribute xml_lib.



726
727
728
 
# File 'lib/awsbase/right_awsbase.rb', line 726

def xml_lib
  @xml_lib
end

#xmlpath ⇒ Object (readonly)

Returns the value of attribute xmlpath.



725
726
727
 
# File 'lib/awsbase/right_awsbase.rb', line 725

def xmlpath
  @xmlpath
end

Class Method Details

.xml_lib ⇒ Object 



716
717
718
 
# File 'lib/awsbase/right_awsbase.rb', line 716

def self.xml_lib
    @@xml_lib
end

.xml_lib=(new_lib_name) ⇒ Object 



720
721
722
 
# File 'lib/awsbase/right_awsbase.rb', line 720

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'



759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
 
# File 'lib/awsbase/right_awsbase.rb', line 759

def parse(xml_text, params={})
    # Get response body
    unless xml_text.is_a?(String)
        xml_text = xml_text.body.respond_to?(:force_encoding) ? xml_text.body.force_encoding("UTF-8") : xml_text.body
    end

    @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)



819
820
 
# File 'lib/awsbase/right_awsbase.rb', line 819

def reset;
end

#tag_end(name) ⇒ Object 



743
744
745
746
747
748
 
# File 'lib/awsbase/right_awsbase.rb', line 743

def tag_end(name)
    if @xmlpath =~ /^(.*?)\/?#{name}$/
        @xmlpath = $1
    end
    tagend(name)
end

#tag_start(name, attributes) ⇒ Object 



737
738
739
740
741
 
# File 'lib/awsbase/right_awsbase.rb', line 737

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

#tagend(name) ⇒ Object 



826
827
828
 
# File 'lib/awsbase/right_awsbase.rb', line 826

def tagend(name)
    ;
end

#tagstart(name, attributes) ⇒ Object 



822
823
824
 
# File 'lib/awsbase/right_awsbase.rb', line 822

def tagstart(name, attributes)
    ;
end

#tagtext(text) ⇒ Object 



830
831
832
 
# File 'lib/awsbase/right_awsbase.rb', line 830

def tagtext(text)
    ;
end

#text(text) ⇒ Object 



750
751
752
753
 
# File 'lib/awsbase/right_awsbase.rb', line 750

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