Class: Rudy::AWS::SDB

Inherits:
Object
  • Object
show all
Includes:
ObjectBase
Defined in:
lib/rudy/aws/sdb.rb,
lib/rudy/aws/sdb/error.rb

Defined Under Namespace

Classes: ConnectionError, Error, FeatureDeprecatedError, InvalidDomainNameError, InvalidNextTokenError, InvalidNumberPredicatesError, InvalidNumberValueTestsError, InvalidParameterValueError, InvalidQueryExpressionError, MissingParameterError, NoAccessKey, NoSecretKey, NoSuchDomainError, NumberDomainAttributesExceededError, NumberDomainBytesExceededError, NumberDomainsExceededError, NumberItemAttributesExceededError, RequestError, RequestTimeoutError

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Huxtable

change_environment, change_position, change_region, change_role, change_zone, #check_keys, #config_dirname, create_domain, #current_group_name, #current_machine_address, #current_machine_count, #current_machine_group, #current_machine_hostname, #current_machine_image, #current_machine_name, #current_machine_size, #current_user, #current_user_keypairpath, debug?, #debug?, domain, domain_exists?, #group_metadata, #has_keypair?, #has_keys?, #has_pem_keys?, #has_root_keypair?, keypair_path_to_name, #known_machine_group?, #root_keypairname, #root_keypairpath, #switch_user, update_config, update_global, update_logger, #user_keypairname, #user_keypairpath

Constructor Details

#initialize(access_key = nil, secret_key = nil, region = nil, debug = nil) ⇒ SDB

Returns a new instance of SDB.

Raises:



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# File 'lib/rudy/aws/sdb.rb', line 20

def initialize(access_key=nil, secret_key=nil, region=nil, debug=nil)
  raise NoAccessKey if access_key.nil? || access_key.empty?
  raise NoSecretKey if secret_key.nil? || secret_key.empty?
    
  url ||= 'http://sdb.amazonaws.com'
  # There is a bug with passing :server to EC2::Base.new so 
  # we'll use the environment variable for now. 
  #if region && Rudy::AWS.valid_region?(region)
  #  "#{region}.sdb.amazonaws.com"
  #end
  
  @access_key_id = access_key || ENV['AWS_ACCESS_KEY']
  @secret_access_key = secret_key || ENV['AWS_SECRET_KEY']
  @base_url = url
  @debug = debug || StringIO.new
end

Class Method Details

.generate_query(*args) ⇒ Object

Takes a zipped Array or Hash of criteria. Returns a string suitable for a SimpleDB Query



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# File 'lib/rudy/aws/sdb.rb', line 81

def self.generate_query(*args)
  q = args.first.is_a?(Hash)? args.first : Hash[*args.flatten]
  query = []
  q.each do |n,v| 
    query << "['#{Rudy::AWS.escape n}'='#{Rudy::AWS.escape v}']"
  end
  query.join(" intersection ")
end

.generate_select(*args) ⇒ Object

Takes a zipped Array or Hash of criteria. Returns a string suitable for a SimpleDB Select



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# File 'lib/rudy/aws/sdb.rb', line 68

def self.generate_select(*args)
  fields, domain, args = *args
  q = args.is_a?(Hash) ? args : Hash[*args.flatten]
  query = []
  q.each do |n,v| 
    query << "#{Rudy::AWS.escape n}='#{Rudy::AWS.escape v}'"
  end
  "select * from #{domain} where " << query.join(' and ')
end

Instance Method Details

#create_domain(domain) ⇒ Object 



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# File 'lib/rudy/aws/sdb.rb', line 52

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

#delete_attributes(domain, item) ⇒ Object Also known as: destroy 



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# File 'lib/rudy/aws/sdb.rb', line 238

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

#destroy_domain(domain) ⇒ Object 



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# File 'lib/rudy/aws/sdb.rb', line 57

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

#get_attributes(domain, item) ⇒ Object Also known as: get 



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# File 'lib/rudy/aws/sdb.rb', line 215

def get_attributes(domain, item)
  doc = call(
    :get,
    {
      'Action' => 'GetAttributes',
      'DomainName' => domain.to_s,
      'ItemName' => item.to_s
    }
  )
  attributes = {}
  if doc
    REXML::XPath.each(doc, "//Attribute") do |attr|
      key = REXML::XPath.first(attr, './Name/text()').to_s
      value = REXML::XPath.first(attr, './Value/text()').to_s
      ( attributes[key] ||= [] ) << value
    end
  end
  attributes = nil if attributes.empty?
  attributes
end

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



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# File 'lib/rudy/aws/sdb.rb', line 37

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
  results
end

#put_attributes(domain, item, attributes, replace = true) ⇒ Object Also known as: put 



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# File 'lib/rudy/aws/sdb.rb', line 191

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

#query(domain, query, max = nil, token = nil) ⇒ Object

<QueryResult><ItemName>in-c2ffrw</ItemName><ItemName>in-72yagt</ItemName><ItemName>in-52j8gj</ItemName>



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# File 'lib/rudy/aws/sdb.rb', line 125

def query(domain, query, max = nil, token = nil)
  params = {
    'Action' => 'Query',
    'QueryExpression' => query,
    'DomainName' => domain.to_s
  }
  params['NextToken'] =
    token unless token.nil? || token.empty?
  params['MaxNumberOfItems'] =
    max.to_s unless max.nil? || max.to_i == 0


  doc = call(:get, params)
  results = []
  if doc
    REXML::XPath.each(doc, '//ItemName/text()') do |item|
      results << item.to_s
    end
  end
  
  #return results, REXML::XPath.first(doc, '//NextToken/text()').to_s
  results.empty? ? nil : results
  
end

#query_with_attributes(domain, query, max = nil, token = nil) ⇒ Object

<QueryWithAttributesResult><Item><Name>in-c2ffrw</Name><Attribute><Name>code</Name><Value>in-c2ffrw</Value></Attribute><Attribute><Name>date_created</Name><Value>2008-10-31</Value></Attribute></Item><Item>



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# File 'lib/rudy/aws/sdb.rb', line 153

def query_with_attributes(domain, query, max = nil, token = nil)
  params = {
    'Action' => 'QueryWithAttributes',
    'QueryExpression' => query,
    'DomainName' => domain.to_s
  }
  params['NextToken'] =
    token unless token.nil? || token.empty?
  params['MaxNumberOfItems'] =
    max.to_s unless max.nil? || max.to_i == 0

  doc = call(:get, params)
  results = []
  if doc
    REXML::XPath.each(doc, "//Item") do |item|
      name = REXML::XPath.first(item, './Name/text()').to_s

      attributes = {'Name' => name}
      REXML::XPath.each(item, "./Attribute") do |attr|
        key = REXML::XPath.first(attr, './Name/text()').to_s
        value = REXML::XPath.first(attr, './Value/text()').to_s
        ( attributes[key] ||= [] ) << value
      end
      results << attributes
    end
    #return results, REXML::XPath.first(doc, '//NextToken/text()').to_s
  end
  
  hash_results = {}
  results.each do |item|
    hash_results[item.delete('Name')] = item
  end
  
  hash_results
end

#select(select, token = nil) ⇒ Object 



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# File 'lib/rudy/aws/sdb.rb', line 91

def select(select, token = nil)
  params = {
    'Action' => 'Select',
    'SelectExpression' => select,
  }
  params['NextToken'] =
    token unless token.nil? || token.empty?
    
  doc = call(:get, params)
  results = []
  if doc
    REXML::XPath.each(doc, "//Item") do |item|
      name = REXML::XPath.first(item, './Name/text()').to_s

      attributes = {'Name' => name}
      REXML::XPath.each(item, "./Attribute") do |attr|
        key = REXML::XPath.first(attr, './Name/text()').to_s
        value = REXML::XPath.first(attr, './Value/text()').to_s
        ( attributes[key] ||= [] ) << value
      end
      results << attributes
    end
    #return results, REXML::XPath.first(doc, '//NextToken/text()').to_s
  end
  
  hash_results = {}
  results.each do |item|
    hash_results[item.delete('Name')] = item
  end
  
  hash_results.empty? ? nil : hash_results
end