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require 'benchmark'
require 'pathname'
module ActionWebService
module Scaffolding # :nodoc:
class ScaffoldingError < ActionWebServiceError # :nodoc:
end
def self.append_features(base)
super
base.extend(ClassMethods)
end
# Web service invocation scaffolding provides a way to quickly invoke web service methods in a controller. The
# generated scaffold actions have default views to let you enter the method parameters and view the
# results.
#
# Example:
#
# class ApiController < ActionController
# web_service_scaffold :invoke
# end
#
# This example generates an +invoke+ action in the +ApiController+ that you can navigate to from
# your browser, select the API method, enter its parameters, and perform the invocation.
#
# If you want to customize the default views, create the following views in "app/views":
#
# * <tt>action_name/methods.rhtml</tt>
# * <tt>action_name/parameters.rhtml</tt>
# * <tt>action_name/result.rhtml</tt>
# * <tt>action_name/layout.rhtml</tt>
#
# Where <tt>action_name</tt> is the name of the action you gave to ClassMethods#web_service_scaffold.
#
# You can use the default views in <tt>RAILS_DIR/lib/action_web_service/templates/scaffolds</tt> as
# a guide.
module ClassMethods
# Generates web service invocation scaffolding for the current controller. The given action name
# can then be used as the entry point for invoking API methods from a web browser.
def web_service_scaffold(action_name)
add_template_helper(Helpers)
module_eval <<-END, __FILE__, __LINE__
def #{action_name}
if request.method == :get
setup_invocation_assigns
render_invocation_scaffold 'methods'
end
end
def #{action_name}_method_params
if request.method == :get
setup_invocation_assigns
render_invocation_scaffold 'parameters'
end
end
def #{action_name}_submit
if request.method == :post
setup_invocation_assigns
protocol_name = params['protocol'] ? params['protocol'].to_sym : :soap
case protocol_name
when :soap
@protocol = Protocol::Soap::SoapProtocol.create(self)
when :xmlrpc
@protocol = Protocol::XmlRpc::XmlRpcProtocol.create(self)
end
@invocation_cgi = request.respond_to?(:cgi) ? request.cgi : nil
bm = Benchmark.measure do
@protocol.register_api(@scaffold_service.api)
post_params = params['method_params'] ? params['method_params'].dup : nil
params = []
if @scaffold_method.expects
@scaffold_method.expects.length.times do |i|
params << post_params[i.to_s]
end
end
params = @scaffold_method.cast_expects(params)
method_name = public_method_name(@scaffold_service.name, @scaffold_method.public_name)
@method_request_xml = @protocol.encode_request(method_name, params, @scaffold_method.expects)
new_request = @protocol.encode_action_pack_request(@scaffold_service.name, @scaffold_method.public_name, @method_request_xml)
prepare_request(new_request, @scaffold_service.name, @scaffold_method.public_name)
@request = new_request
if @scaffold_container.dispatching_mode != :direct
request.parameters['action'] = @scaffold_service.name
end
dispatch_web_service_request
@method_response_xml = @response.body
method_name, obj = @protocol.decode_response(@method_response_xml)
return if handle_invocation_exception(obj)
@method_return_value = @scaffold_method.cast_returns(obj)
end
@method_elapsed = bm.real
add_instance_variables_to_assigns
reset_invocation_response
render_invocation_scaffold 'result'
end
end
private
def setup_invocation_assigns
@scaffold_class = self.class
@scaffold_action_name = "#{action_name}"
@scaffold_container = WebServiceModel::Container.new(self)
if params['service'] && params['method']
@scaffold_service = @scaffold_container.services.find{ |x| x.name == params['service'] }
@scaffold_method = @scaffold_service.api_methods[params['method']]
end
add_instance_variables_to_assigns
end
def render_invocation_scaffold(action)
customized_template = "\#{self.class.controller_path}/#{action_name}/\#{action}"
default_template = scaffold_path(action)
@content_for_layout = template_exists?(customized_template) ? @template.render_file(customized_template) : @template.render_file(default_template, false)
self.active_layout ? render_file(self.active_layout, "200 OK", true) : render_file(scaffold_path("layout"))
end
def scaffold_path(template_name)
File.dirname(__FILE__) + "/templates/scaffolds/" + template_name + ".rhtml"
end
def reset_invocation_response
template = response.template
if @invocation_cgi
@response = ::ActionController::CgiResponse.new(@invocation_cgi)
else
@response = ::ActionController::TestResponse.new
end
response.template = template
@performed_render = false
end
def public_method_name(service_name, method_name)
if web_service_dispatching_mode == :layered && @protocol.is_a?(ActionWebService::Protocol::XmlRpc::XmlRpcProtocol)
service_name + '.' + method_name
else
method_name
end
end
def prepare_request(new_request, service_name, method_name)
new_request.parameters.update(request.parameters)
request.env.each{ |k, v| new_request.env[k] = v unless new_request.env.has_key?(k) }
if web_service_dispatching_mode == :layered && @protocol.is_a?(ActionWebService::Protocol::Soap::SoapProtocol)
new_request.env['HTTP_SOAPACTION'] = "/\#{controller_name()}/\#{service_name}/\#{method_name}"
end
end
def handle_invocation_exception(obj)
exception = nil
if obj.respond_to?(:detail) && obj.detail.respond_to?(:cause) && obj.detail.cause.is_a?(Exception)
exception = obj.detail.cause
elsif obj.is_a?(XMLRPC::FaultException)
exception = obj
end
return unless exception
reset_invocation_response
rescue_action(exception)
true
end
END
end
end
module Helpers # :nodoc:
def method_parameter_input_fields(method, type, field_name_base)
if type.array?
return content_tag('em', "Typed array input fields not supported yet (#{type.name})")
end
if type.structured?
parameters = ""
type.each_member do |member_name, member_type|
label = method_parameter_label(member_name, member_type)
nested_content = method_parameter_input_fields(
method,
member_type,
field_name_base + '[' + member_name.to_s + ']')
if member_type.custom?
parameters << content_tag('li', label)
parameters << content_tag('ul', nested_content)
else
parameters << content_tag('li', label + ' ' + nested_content)
end
end
content_tag('ul', parameters)
else
case type.type
when :int
text_field_tag field_name_base
when :string
text_field_tag field_name_base
when :bool
radio_button_tag(field_name_base, "true") + " True" +
radio_button_tag(field_name_base, "false") + "False"
when :float
text_field_tag field_name_base
when :time
select_datetime Time.now, 'name' => field_name_base
when :date
select_date Date.today, 'name' => field_name_base
end
end
end
def method_parameter_label(name, type)
name.to_s.capitalize + ' (' + type.human_name(false) + ')'
end
def service_method_list(service)
action = @scaffold_action_name + '_method_params'
methods = service.api_methods_full.map do |desc, name|
content_tag("li", link_to(desc, :action => action, :service => service.name, :method => name))
end
content_tag("ul", methods.join("\n"))
end
end
module WebServiceModel # :nodoc:
class Container # :nodoc:
attr :services
attr :dispatching_mode
def initialize(real_container)
@real_container = real_container
@dispatching_mode = @real_container.class.web_service_dispatching_mode
@services = []
if @dispatching_mode == :direct
@services << Service.new(@real_container.controller_name, @real_container)
else
@real_container.class.web_services.each do |name, obj|
@services << Service.new(name, @real_container.instance_eval{ web_service_object(name) })
end
end
end
end
class Service # :nodoc:
attr :name
attr :object
attr :api
attr :api_methods
attr :api_methods_full
def initialize(name, real_service)
@name = name.to_s
@object = real_service
@api = @object.class.web_service_api
if @api.nil?
raise ScaffoldingError, "No web service API attached to #{object.class}"
end
@api_methods = {}
@api_methods_full = []
@api.api_methods.each do |name, method|
@api_methods[method.public_name.to_s] = method
@api_methods_full << [method.to_s, method.public_name.to_s]
end
end
def to_s
self.name.camelize
end
end
end
end
end
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