Class: DataMapper::Adapters::RestfulAdapter

Inherits:
BaseAdapter
  • Object
show all
Includes:
Slf4r::Logger
Defined in:
lib/datamapper4rails/adapters/restful_adapter.rb

Instance Method Summary collapse

Methods inherited from BaseAdapter

#create, #initialize, #read_many, #read_one, #transaction_primitive

Constructor Details

This class inherits a constructor from DataMapper::Adapters::BaseAdapter

Instance Method Details

#attributes_to_xml(name, attributes) ⇒ Object 



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 53

def attributes_to_xml(name, attributes)
  xml = "<#{name}>"
  attributes.each do |attr, val|
    xml += "<#{attr.name}>#{val}</#{attr.name}>"
  end
  xml += "</#{name}>"
end

#create_resource(resource) ⇒ Object

See Also:



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 195

def create_resource(resource)
  name = resource.model.name
  uri = "/#{name.pluralize}.xml"
  logger.debug { "post #{uri}" }
  response = http_post(uri, resource.to_xml )
  resource_new = parse_resource(REXML::Document::new(response.body).root, 
                            resource.model,
                            ::DataMapper::Query.new(resource.repository, 
                                                    resource.model ))

  # copy all attributes/associations from the downloaded resource
  # to the given resource
  # TODO better pass the given resource into parse_resource
  resource_new.attributes.each do |key, value|
    resource.send(:properties)[key].set!(resource, value)
  end
  resource_new.send(:relationships).each do |key, value|
    resource.send("#{key}=".to_sym, resource_new.send(key))
  end
  resource
end

#delete(query) ⇒ Object 



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 281

def delete(query)
  if query.limit == 1 or single_entity_query?(query)
    name = resource_name_from_query(query)
    key = key_value_from_query(query)
    uri = "/#{name.pluralize}/#{key}.xml"
    logger.debug { "delete #{uri}" }
    response = http_delete(uri)
    response.kind_of?(Net::HTTPSuccess) 
  else
    super
  end
end

#delete_resource(resource) ⇒ Object

See Also:



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 295

def delete_resource(resource)
  name = resource.name
  key = key_value_from_query(resource.to_query)
  uri = "/#{name.pluralize}/#{key}.xml"
  logger.debug { "delete #{uri}" }
  response = http_delete(uri)
  response.kind_of?(Net::HTTPSuccess) 
end

#http_delete(uri) ⇒ Object 



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 95

def http_delete(uri)
  send_request do |http|
    request = Net::HTTP::Delete.new(uri)
    request.basic_auth(@uri[:login], 
                       @uri[:password]) unless @uri[:login].blank?
    http.request(request)
  end
end

#http_get(uri) ⇒ Object 



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 61

def http_get(uri)
  send_request do |http|
    request = Net::HTTP::Get.new(uri)
    request.basic_auth(@uri[:login], 
                       @uri[:password]) unless @uri[:login].blank?
    http.request(request)
  end
end

#http_post(uri, data = nil) ⇒ Object 



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 70

def http_post(uri, data = nil)
  send_request do |http|
    request = Net::HTTP::Post.new(uri, {
                                    'content-type' => 'application/xml',
                                    'content-length' => data.length.to_s
                                  })
    request.basic_auth(@uri[:login], 
                       @uri[:password]) unless @uri[:login].blank?
    http.request(request, data)
  end
end

#http_put(uri, data = nil) ⇒ Object 



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 82

def http_put(uri, data = nil)
  send_request do |http|
    request = Net::HTTP::Put.new(uri, {
                                    'content-type' => 'application/xml',
                                    'content-length' => data.length.to_s
                                  })
    request.basic_auth(@uri[:login], 
                       @uri[:password]) unless @uri[:login].blank?
#          request.set_form_data(data)
    http.request(request, data)
  end
end

#key_value_from_query(query) ⇒ Object 



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 34

def key_value_from_query(query)
  keys = keys_from_query(query)
  logger.debug { "keys=#{keys.inspect}" }
  if keys.size == 1
    key = keys[0]
    # return the third element of the condition array
    # which belongs to the key
    query.conditions.detect do |c|
      c[1] == key
    end[2]
  else
    raise "compound keys are not supported"
  end
end

#keys_from_query(query) ⇒ Object 



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 21

def keys_from_query(query)
  keys = query.model.key
  # work around strange missing of properties in model
  # but the query has still the fields :P
  if keys.size == 0
    query.fields.select do |f|
      f.key?
    end
  else
    keys
  end
end

#parse_resource(xml, model, query = nil) ⇒ Object 



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 113

def parse_resource(xml, model, query = nil)
  elements = {}
  associations = {}
  many_to_many = {}
  xml.elements.collect do |element|
    if element.text.nil? 
      if element.attributes['type'] == 'array'
        many_to_many[element.name.gsub('-','_').to_sym] = element
      else
        associations[element.name.gsub('-','_').to_sym] = element
      end
    else
      elements[element.name.gsub('-','_').to_sym] = element.text
    end
  end
#puts
#puts "elements"
#p elements
#p query
#p model
  resource = model.load(model.properties.collect do |f|
                            elements[f.name]
                          end, query)
  resource.send("#{keys_from_query(query)[0].name}=".to_sym, elements[keys_from_query(query)[0].name] )
# p resource
#p associations
  associations.each do |name, association| 
#          puts "asso"
#          p model
#          p name
#          p association
#p model.relationships
    is_one_to_one = false
    asso_model = 
      if rel = model.relationships[name]
#puts "rel"
#p rel
        if rel.child_model == model
          rel.parent_model
        else
          rel.child_model
        end
        #                  else
#::Extlib::Inflection.constantize(::Extlib::Inflection.classify(name))
#                    model.find_const(::Extlib::Inflection.classify(name))
      end
  #        p asso_model
    if resource.respond_to? "#{name}=".to_sym
     #  puts
#             puts "association"
#             puts name
#             p model
#             p asso_model
      resource.send("#{name}=".to_sym, 
                    parse_resource(association, asso_model,
                                   ::DataMapper::Query.new(query.repository, asso_model ))) unless asso_model.nil?
    else
      resource.send(("#{name.to_s.pluralize}<" + "<").to_sym, 
                    parse_resource(association, asso_model,
                                   ::DataMapper::Query.new(query.repository, asso_model ))) unless asso_model.nil?
    end
  end

#puts "many 2 many"
#p many_to_many
  many_to_many.each do |name, many|
    if model.relationships[name]
      # TODO
    else
 #           p ::Extlib::Inflection.classify(name.to_s.singularize)
      many_model = Object.const_get(::Extlib::Inflection.classify(name.to_s.singularize))
      resource.send(name).send(("<" + "<").to_sym, 
                 parse_resource(many, many_model,
                                ::DataMapper::Query.new(query.repository, many_model ))) unless many_model.nil?
    end
  end
  resource.instance_variable_set(:@new_record, false)
#p resource
  resource
end

#read_resource(query) ⇒ Object

See Also:



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 218

def read_resource(query)
  key = key_value_from_query(query)
  uri = "/#{resource_name_from_query(query).pluralize}/#{key}.xml"
  logger.debug { "get #{uri}" }
  response = http_get(uri)
  if response.kind_of?(Net::HTTPSuccess)
    logger.debug { response.body.to_s }
    parse_resource(REXML::Document::new(response.body).root, 
                   query.model, 
                   query)
  else
      #TODO may act on different response codes differently
  end
end

#read_resources(query) ⇒ Object

See Also:



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 234

def read_resources(query)
  if single_entity_query?(query)
    [read_resource(query)]
  else
    uri = "/#{resource_name_from_query(query).pluralize}.xml"
    logger.debug { "get #{uri}" }
    response = http_get(uri)
    if response.kind_of?(Net::HTTPSuccess)
      result = []
      logger.debug { response.body.to_s }
      REXML::Document::new(response.body).root.each do |element|
        result << parse_resource(element, 
                                 query.model, 
                                 query)
      end
      result
    else
      #TODO may act on different response codes differently
    end
  end
end

#resource_name_from_model(model) ⇒ Object 



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 13

def resource_name_from_model(model)
  ::Extlib::Inflection.underscore(model.name)
end

#resource_name_from_query(query) ⇒ Object 



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 17

def resource_name_from_query(query)
  resource_name_from_model(query.model)
end

#send_request(&block) ⇒ Object 



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 104

def send_request(&block)
  res = nil
  Net::HTTP.start(@uri[:host], @uri[:port].to_i) do |http|
    res = yield(http)
  end
  logger.debug { "response=" + res.code }
  res
end

#single_entity_query?(query) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 49

def single_entity_query?(query)
  query.conditions.count {|c| c[1].key? and c[0] == :eql} == query.model.key.size
end

#update(attributes, query) ⇒ Object 



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 257

def update(attributes, query)
  if query.limit == 1 or single_entity_query?(query)
    xml = attributes_to_xml(resource_name_from_query(query), attributes)
    key = key_value_from_query(query)
    uri = "/#{resource_name_from_query(query).pluralize}/#{key}.xml"
    logger.debug { "put #{uri}" }
    response = http_put(uri, xml)
    response.kind_of?(Net::HTTPSuccess)
  else
    super
  end
end

#update_resource(resource, attributes) ⇒ Object

See Also:



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# File 'lib/datamapper4rails/adapters/restful_adapter.rb', line 271

def update_resource(resource, attributes)
  query = resource.to_query
  xml = attributes_to_xml(resource.name, attributes)
  key = key_value_from_query(query)
  logger.debug {resource.to_xml}
  response = http_put("/#{resource_name_from_query(query).pluralize}/#{key}.xml", xml)
  response.kind_of?(Net::HTTPSuccess)
end