Class: AwsSdb::Service

Inherits:
Object
  • Object
show all
Defined in:
lib/aws_sdb/service.rb

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Service

Returns a new instance of Service.



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# File 'lib/aws_sdb/service.rb', line 26

def initialize(options={})
  @access_key_id = options[:access_key_id] || ENV['AMAZON_ACCESS_KEY_ID']
  @secret_access_key = options[:secret_access_key] || ENV['AMAZON_SECRET_ACCESS_KEY']
  @base_url = options[:url] || 'http://sdb.amazonaws.com'
  @logger = options[:logger] || Logger.new("aws_sdb.log")
end

Instance Method Details

#create_domain(domain) ⇒ Object 



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# File 'lib/aws_sdb/service.rb', line 47

def create_domain(domain)
  domain.strip! if domain
  call(:post, { 'Action' => 'CreateDomain', 'DomainName'=> domain.to_s })
  nil
end

#delete_attributes(domain, item) ⇒ Object 



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# File 'lib/aws_sdb/service.rb', line 146

def delete_attributes(domain, item)
  call(
    :delete,
    {
      'Action' => 'DeleteAttributes',
      'DomainName' => domain.to_s,
      'ItemName' => item.to_s
    }
  )
  nil
end

#delete_domain(domain) ⇒ Object 



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# File 'lib/aws_sdb/service.rb', line 53

def delete_domain(domain)
  call(
    :delete,
    { 'Action' => 'DeleteDomain', 'DomainName' => domain.to_s }
  )
  nil
end

#get_attributes(domain, item, consistent_read = 'true') ⇒ Object

updated to support consitent read



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# File 'lib/aws_sdb/service.rb', line 124

def get_attributes(domain, item, consistent_read = 'true')
  doc = call(
    :get,
    {
      'Action' => 'GetAttributes',
      'DomainName' => domain.to_s,
      'ItemName' => item.to_s,
      'ConsistentRead' =>  consistent_read
    }
  )
  attributes = {}
  REXML::XPath.each(doc, "//Attribute") do |attr|
    unesc_key = REXML::XPath.first(attr, './Name/text()').to_s
    unesc_value = REXML::XPath.first(attr, './Value/text()').to_s
    #unescape key and value to return to normal
    key = CGI.unescape(unesc_key)
    value = CGI.unescape(unesc_value)
    ( attributes[key] ||= [] ) << value
  end
  attributes
end

#list_domains(max = nil, token = nil) ⇒ Object 



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# File 'lib/aws_sdb/service.rb', line 33

def list_domains(max = nil, token = nil)
  params = { 'Action' => 'ListDomains' }
  params['NextToken'] =
    token unless token.nil? || token.empty?
  params['MaxNumberOfDomains'] =
    max.to_s unless max.nil? || max.to_i == 0
  doc = call(:get, params)
  results = []
  REXML::XPath.each(doc, '//DomainName/text()') do |domain|
    results << domain.to_s
  end
  return results, REXML::XPath.first(doc, '//NextToken/text()').to_s
end

#put_attributes(domain, item, attributes, replace = true) ⇒ Object 



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# File 'lib/aws_sdb/service.rb', line 103

def put_attributes(domain, item, attributes, replace = true)
  params = {
    'Action' => 'PutAttributes',
    'DomainName' => domain.to_s,
    'ItemName' => item.to_s
  }
  count = 0
  #escaping key and value so signature computes correctly
  attributes.each do | key, values |
    ( []<<values ).flatten.each do |value|
      params["Attribute.#{count}.Name"] = CGI.escape(key.to_s)
      params["Attribute.#{count}.Value"] = CGI.escape(value.to_s)
      params["Attribute.#{count}.Replace"] = replace
      count += 1
    end
  end
  call(:put, params)
  nil
end

#select(query, max = nil, token = nil, consistent_read = 'true') ⇒ Object 



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# File 'lib/aws_sdb/service.rb', line 61

def select(query, max = nil, token = nil, consistent_read = 'true')
  query 
  params = {
    'Action' => 'Select',
    'SelectExpression' => query,
    'ConsistentRead' => consistent_read
  }
  params['NextToken'] =
    token unless token.nil? || token.empty?
  params['MaxNumberOfItems'] =
    max.to_s unless max.nil? || max.to_i == 0

  @logger.debug { "SELECT EXPRESSION BEFORE CALL: #{query.inspect}" } if @logger.debug?
  doc = call(:get, params)

  items = {}
  attributes = {}

  #build the result hash
  REXML::XPath.each(doc, '//Item') do |item_doc|
    item_name = item_doc.elements["Name"].text

    item_doc.each do |attrib_doc|
      att_name = attrib_doc.elements["Name"]
      att_value = attrib_doc.elements["Value"]
      
      next unless (att_name && att_value)
      
      attrib_name = CGI.unescape(att_name.text)
      attrib_value = CGI.unescape(att_value.text)

      add_value(attributes, attrib_name, attrib_value)
    end
    items[item_name] = attributes
    #reset attributes so we don't clobber next item
    attributes = {}
    items
  end
  results = items
  return results, REXML::XPath.first(doc, '//NextToken/text()').to_s
end