Class: RightAws::RightAWSParser

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

Overview

:nodoc:

Direct Known Subclasses

AcfInterface::AcfDistributionListParser, AcfInterface::AcfOriginAccesIdentitiesListParser, AcwInterface::GetMetricStatisticsParser, AcwInterface::ListMetricsParser, AsInterface::DescribeAutoScalingGroupsParser, AsInterface::DescribeLaunchConfigurationsParser, AsInterface::DescribeScalingActivitiesParser, AsInterface::DescribeTriggersParser, Ec2::QEc2AllocateAddressParser, Ec2::QEc2AttachAndDetachVolumeParser, Ec2::QEc2AttachVpnGatewayParser, Ec2::QEc2BundleInstanceParser, Ec2::QEc2CancelSpotInstanceParser, Ec2::QEc2ConfirmProductInstanceParser, Ec2::QEc2CreateKeyPairParser, Ec2::QEc2CreateVolumeParser, Ec2::QEc2DescribeAddressesParser, Ec2::QEc2DescribeAvailabilityZonesParser, Ec2::QEc2DescribeBundleTasksParser, Ec2::QEc2DescribeCustomerGatewaysParser, Ec2::QEc2DescribeDhcpOptionsParser, Ec2::QEc2DescribeImageAttributeParser, Ec2::QEc2DescribeImagesParser, Ec2::QEc2DescribeInstanceAttributeParser, Ec2::QEc2DescribeInstancesParser, Ec2::QEc2DescribeKeyPairParser, Ec2::QEc2DescribeRegionsParser, Ec2::QEc2DescribeReservedInstancesOfferingsParser, Ec2::QEc2DescribeReservedInstancesParser, Ec2::QEc2DescribeSecurityGroupsParser, Ec2::QEc2DescribeSnapshotAttributeParser, Ec2::QEc2DescribeSnapshotsParser, Ec2::QEc2DescribeSpotDatafeedSubscriptionParser, Ec2::QEc2DescribeSpotInstanceParser, Ec2::QEc2DescribeSpotPriceHistoryParser, Ec2::QEc2DescribeSubnetsParser, Ec2::QEc2DescribeVolumesParser, Ec2::QEc2DescribeVpcsParser, Ec2::QEc2DescribeVpnConnectionsParser, Ec2::QEc2DescribeVpnGatewaysParser, Ec2::QEc2GetConsoleOutputParser, Ec2::QEc2GetPasswordDataParser, Ec2::QEc2MonitorInstancesParser, Ec2::QEc2PurchaseReservedInstancesOfferingParser, Ec2::QEc2RegisterImageParser, Ec2::QEc2TerminateInstancesParser, ElbInterface::AvailabilityZonesForLoadBalancerParser, ElbInterface::CreateLoadBalancerParser, ElbInterface::DeleteLoadBalancerParser, ElbInterface::DescribeInstanceHealthParser, ElbInterface::DescribeLoadBalancersParser, ElbInterface::HealthCheckParser, ElbInterface::InstancesWithLoadBalancerParser, RightAws::RdsInterface::DescribeDbInstancesParser, RightAws::RdsInterface::DescribeDbParameterGroupsParser, RightAws::RdsInterface::DescribeDbParametersParser, RightAws::RdsInterface::DescribeDbSecurityGroupsParser, RightAws::RdsInterface::DescribeDbSnapshotsParser, RightAws::RdsInterface::DescribeEventsParser, RightBoolResponseParser, 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.



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

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



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# File 'lib/awsbase/right_awsbase.rb', line 908

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.



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

def full_tag_name
  @full_tag_name
end

#result ⇒ Object

Returns the value of attribute result.



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# File 'lib/awsbase/right_awsbase.rb', line 821

def result
  @result
end

#tag ⇒ Object (readonly)

Returns the value of attribute tag.



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# File 'lib/awsbase/right_awsbase.rb', line 825

def tag
  @tag
end

#xml_lib ⇒ Object

Returns the value of attribute xml_lib.



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

def xml_lib
  @xml_lib
end

#xmlpath ⇒ Object (readonly)

Returns the value of attribute xmlpath.



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

def xmlpath
  @xmlpath
end

Class Method Details

.xml_lib ⇒ Object 



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

def self.xml_lib
  @@xml_lib
end

.xml_lib=(new_lib_name) ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 817

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'



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# File 'lib/awsbase/right_awsbase.rb', line 857

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'  
    if XML::Parser::VERSION >= '0.9.9'
      # avoid warning on every usage
      xml        = XML::SaxParser.string(xml_text)
    else
      xml        = XML::SaxParser.new 
      xml.string = xml_text 
    end
    # 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)



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# File 'lib/awsbase/right_awsbase.rb', line 917

def reset                     ; end

#tag_end(name) ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 844

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

#tag_start(name, attributes) ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 837

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 



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# File 'lib/awsbase/right_awsbase.rb', line 919

def tagend(name)              ; end

#tagstart(name, attributes) ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 918

def tagstart(name, attributes); end

#tagtext(text) ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 920

def tagtext(text)             ; end

#text(text) ⇒ Object 



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# File 'lib/awsbase/right_awsbase.rb', line 849

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