Class: Scorpio::ResourceBase

Inherits:
Object
  • Object
show all
Includes:
FingerprintHash
Defined in:
lib/scorpio/resource_base.rb,
lib/scorpio/pickle_adapter.rb

Defined Under Namespace

Modules: PickleAdapter

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from FingerprintHash

#==, #hash

Constructor Details

#initialize(attributes = {}, options = {}) ⇒ ResourceBase

Returns a new instance of ResourceBase.



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# File 'lib/scorpio/resource_base.rb', line 489

def initialize(attributes = {}, options = {})
  @attributes = Scorpio.stringify_symbol_keys(attributes)
  @options = Scorpio.stringify_symbol_keys(options)
  @persisted = !!@options['persisted']
end

Instance Attribute Details

#attributes ⇒ Object (readonly)

Returns the value of attribute attributes.



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# File 'lib/scorpio/resource_base.rb', line 495

def attributes
  @attributes
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/scorpio/resource_base.rb', line 496

def options
  @options
end

Class Method Details

.all_schema_properties ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 146

def all_schema_properties
  represented_schemas.map(&:described_hash_property_names).inject(Set.new, &:|)
end

.call_operation(operation, call_params: nil, model_attributes: nil) ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 252

def call_operation(operation, call_params: nil, model_attributes: nil)
  call_params = Scorpio.stringify_symbol_keys(call_params) if call_params.is_a?(Hash)
  model_attributes = Scorpio.stringify_symbol_keys(model_attributes || {})
  http_method = operation.http_method.downcase.to_sym
  path_template = Addressable::Template.new(operation.path)
  template_params = model_attributes
  template_params = template_params.merge(call_params) if call_params.is_a?(Hash)
  missing_variables = path_template.variables - template_params.keys
  if missing_variables.any?
    raise(ArgumentError, "path #{operation.path} for operation #{operation.operationId} requires attributes " +
      "which were missing: #{missing_variables.inspect}")
  end
  empty_variables = path_template.variables.select { |v| template_params[v].to_s.empty? }
  if empty_variables.any?
    raise(ArgumentError, "path #{operation.path} for operation #{operation.operationId} requires attributes " +
      "which were empty: #{empty_variables.inspect}")
  end
  path = path_template.expand(template_params)
  # we do not use Addressable::URI#join as the paths should just be concatenated, not resolved.
  # we use File.join just to deal with consecutive slashes.
  url = File.join(base_url, path)
  url = Addressable::URI.parse(url)
  # assume that call_params must be included somewhere. model_attributes are a source of required things
  # but not required to be here.
  other_params = call_params
  if other_params.is_a?(Hash)
    other_params.reject! { |k, _| path_template.variables.include?(k) }
  end

  if operation.request_schema
    # TODO deal with model_attributes / call_params better in nested whatever
    if call_params.nil?
      body = request_body_for_schema(model_attributes, operation.request_schema)
    elsif call_params.is_a?(Hash)
      body = request_body_for_schema(model_attributes.merge(call_params), operation.request_schema)
      body = body.merge(call_params) # TODO
    else
      body = call_params
    end
  else
    if other_params
      if METHODS_WITH_BODIES.any? { |m| m.to_s == http_method.downcase.to_s }
        body = other_params
      else
        if other_params.is_a?(Hash)
          # TODO pay more attention to 'parameters' api method attribute
          url.query_values = other_params
        else
          raise
        end
      end
    end
  end

  request_headers = {}

  if METHODS_WITH_BODIES.any? { |m| m.to_s == http_method.downcase.to_s } && body != nil
    consumes = operation.consumes || openapi_document.consumes || []
    if consumes.include?("application/json") || (!body.respond_to?(:to_str) && consumes.empty?)
    # if we have a body that's not a string and no indication of how to serialize it, we guess json.
      request_headers['Content-Type'] = "application/json"
      unless body.respond_to?(:to_str)
        body = ::JSON.pretty_generate(Typelike.as_json(body))
      end
    elsif consumes.include?("application/x-www-form-urlencoded")
      request_headers['Content-Type'] = "application/x-www-form-urlencoded"
      unless body.respond_to?(:to_str)
        body = URI.encode_www_form(body)
      end
    elsif body.is_a?(String)
      if consumes.size == 1
        request_headers['Content-Type'] = consumes.first
      end
    else
      raise("do not know how to serialize for #{consumes.inspect}: #{body.pretty_inspect.chomp}")
    end
  end

  response = connection.run_request(http_method, url, body, request_headers)

  if response.media_type == 'application/json'
    if response.body.empty?
      response_object = nil
    else
      begin
        response_object = ::JSON.parse(response.body)
      rescue ::JSON::ParserError
        # TODO warn
        response_object = response.body
      end
    end
  else
    response_object = response.body
  end

  if operation.responses
    _, operation_response = operation.responses.detect { |k, v| k.to_s == response.status.to_s }
    operation_response ||= operation.responses['default']
    response_schema = operation_response['schema'] if operation_response
  end
  if response_schema
    # not too sure about this, but I don't think it makes sense to instantiate things that are
    # not hash or array as a SchemaInstanceBase
    if response_object.respond_to?(:to_hash) || response_object.respond_to?(:to_ary)
      response_object = Scorpio.class_for_schema(response_schema).new(response_object)
    end
  end

  error_class = Scorpio.error_classes_by_status[response.status]
  error_class ||= if (400..499).include?(response.status)
    ClientError
  elsif (500..599).include?(response.status)
    ServerError
  elsif !response.success?
    HTTPError
  end
  if error_class
    message = "Error calling operation #{operation.operationId} on #{self}:\n" + (response.env[:raw_body] || response.env.body)
    raise(error_class.new(message).tap do |e|
      e.faraday_response = response
      e.response_object = response_object
    end)
  end

  initialize_options = {
    'persisted' => true,
    'source' => {'operationId' => operation.operationId, 'call_params' => call_params, 'url' => url.to_s},
    'response' => response,
  }
  response_object_to_instances(response_object, initialize_options)
end

.connection ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 240

def connection
  Faraday.new(:headers => {'User-Agent' => user_agent}) do |c|
    faraday_request_middleware.each do |m|
      c.request(*m)
    end
    faraday_response_middleware.each do |m|
      c.response(*m)
    end
    c.adapter(*faraday_adapter)
  end
end

.define_inheritable_accessor(accessor, options = {}) ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 13

def define_inheritable_accessor(accessor, options = {})
  if options[:default_getter]
    # the value before the field is set (overwritten) is the result of the default_getter proc
    define_singleton_method(accessor, &options[:default_getter])
  else
    # the value before the field is set (overwritten) is the default_value (which is nil if not specified)
    default_value = options[:default_value]
    define_singleton_method(accessor) { default_value }
  end
  # field setter method. redefines the getter, replacing the method with one that returns the
  # setter's argument (that being inherited to the scope of the define_method(accessor) block
  define_singleton_method(:"#{accessor}=") do |value|
    # the setter operates on the singleton class of the receiver (self)
    singleton_class.instance_exec(value, self) do |value_, klass|
      # remove a previous getter. NameError is raised if a getter is not defined on this class;
      # this may be ignored.
      begin
        remove_method(accessor)
      rescue NameError
      end
      # getter method
      define_method(accessor) { value_ }
      # invoke on_set callback defined on the class
      if options[:on_set]
        klass.instance_exec(&options[:on_set])
      end
    end
  end
end

.method_names_by_operation ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 202

def method_names_by_operation
  @method_names_by_operation ||= Hash.new do |h, operation|
    h[operation] = begin
      raise(ArgumentError, operation.pretty_inspect) unless operation.is_a?(Scorpio::OpenAPI::V2::Operation)

      if operation.tags.respond_to?(:to_ary) && operation.tags.include?(tag_name) && operation.operationId =~ /\A#{Regexp.escape(tag_name)}\.(\w+)\z/
        method_name = $1
      else
        method_name = operation.operationId
      end
    end
  end
end

.openapi_document ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 100

def openapi_document
  nil
end

.openapi_document=(openapi_document) ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 104

def openapi_document=(openapi_document)
  self.openapi_document_class = self

  if openapi_document.is_a?(Hash)
    openapi_document = OpenAPI::V2::Document.new(openapi_document)
  end

  begin
    singleton_class.instance_exec { remove_method(:openapi_document) }
  rescue NameError
  end
  define_singleton_method(:openapi_document) { openapi_document }
  define_singleton_method(:openapi_document=) do
    if self == openapi_document_class
      raise(ArgumentError, "openapi_document may only be set once on #{self.inspect}")
    else
      raise(ArgumentError, "openapi_document may not be overridden on subclass #{self.inspect} after it was set on #{openapi_document_class.inspect}")
    end
  end
  update_dynamic_methods

  openapi_document.paths.each do |path, path_item|
    path_item.each do |http_method, operation|
      next if http_method == 'parameters' # parameters is not an operation. TOOD maybe just select the keys that are http methods?
      unless operation.is_a?(Scorpio::OpenAPI::V2::Operation)
        raise("bad operation at #{operation.fragment}: #{operation.pretty_inspect}")
      end
      operation.path = path
      operation.http_method = http_method
    end
  end

  openapi_document.validate!

  update_dynamic_methods
end

.operation_for_resource_class?(operation) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scorpio/resource_base.rb', line 165

def operation_for_resource_class?(operation)
  return false unless tag_name

  return true if operation.tags.respond_to?(:to_ary) && operation.tags.include?(tag_name)

  if operation.request_schema && represented_schemas.include?(operation.request_schema)
    return true
  end

  return false
end

.operation_for_resource_instance?(operation) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scorpio/resource_base.rb', line 177

def operation_for_resource_instance?(operation)
  return false unless operation_for_resource_class?(operation)

  # define an instance method if the request schema is for this model 
  request_resource_is_self = operation.request_schema && represented_schemas.include?(operation.request_schema)

  # also define an instance method depending on certain attributes the request description 
  # might have in common with the model's schema attributes
  request_attributes = []
  # if the path has attributes in common with model schema attributes, we'll define on 
  # instance method
  request_attributes |= Addressable::Template.new(operation.path).variables
  # TODO if the method request schema has attributes in common with the model schema attributes,
  # should we define an instance method?
  #request_attributes |= request_schema && request_schema['type'] == 'object' && request_schema['properties'] ?
  #  request_schema['properties'].keys : []
  # TODO if the method parameters have attributes in common with the model schema attributes,
  # should we define an instance method?
  #request_attributes |= method_desc['parameters'] ? method_desc['parameters'].keys : []

  schema_attributes = represented_schemas.map(&:described_hash_property_names).inject(Set.new, &:|)

  return request_resource_is_self || (request_attributes & schema_attributes.to_a).any?
end

.request_body_for_schema(object, schema) ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 384

def request_body_for_schema(object, schema)
  if object.is_a?(Scorpio::ResourceBase)
    # TODO request_schema_fail unless schema is for given model type 
    request_body_for_schema(object.attributes, schema)
  elsif object.is_a?(Scorpio::SchemaInstanceBase)
    request_body_for_schema(object.instance, schema)
  elsif object.is_a?(Scorpio::JSON::Node)
    request_body_for_schema(object.content, schema)
  else
    if object.is_a?(Hash)
      object.map do |key, value|
        if schema
          if schema['type'] == 'object'
            # TODO code dup with response_object_to_instances
            if schema['properties'] && schema['properties'][key]
              subschema = schema['properties'][key]
              include_pair = true
            else
              if schema['patternProperties']
                _, pattern_schema = schema['patternProperties'].detect do |pattern, _|
                  key =~ Regexp.new(pattern) # TODO map pattern to ruby syntax
                end
              end
              if pattern_schema
                subschema = pattern_schema
                include_pair = true
              else
                if schema['additionalProperties'] == false
                  include_pair = false
                elsif schema['additionalProperties'] == nil
                  # TODO decide on this (can combine with `else` if treating nil same as schema present)
                  include_pair = true
                  subschema = nil
                else
                  include_pair = true
                  subschema = schema['additionalProperties']
                end
              end
            end
          elsif schema['type']
            request_schema_fail(object, schema)
          else
            # TODO not sure
            include_pair = true
            subschema = nil
          end
        end
        if include_pair
          {key => request_body_for_schema(value, subschema)}
        else
          {}
        end
      end.inject({}, &:update)
    elsif object.is_a?(Array) || object.is_a?(Set)
      object.map do |el|
        if schema
          if schema['type'] == 'array'
            # TODO index based subschema or whatever else works for array
            subschema = schema['items']
          else
            request_schema_fail(object, schema)
          end
        end
        request_body_for_schema(el, subschema)
      end
    else
      # TODO maybe raise on anything not serializable 
      # TODO check conformance to schema, request_schema_fail if not
      object
    end
  end
end

.request_schema_fail(object, schema) ⇒ Object

Raises:



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# File 'lib/scorpio/resource_base.rb', line 457

def request_schema_fail(object, schema)
  raise(RequestSchemaFailure, "object does not conform to schema.\nobject = #{object.pretty_inspect}\nschema = #{::JSON.pretty_generate(schema, quirks_mode: true)}")
end

.response_object_to_instances(object, initialize_options = {}) ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 461

def response_object_to_instances(object, initialize_options = {})
  if object.is_a?(SchemaInstanceBase)
    model = models_by_schema[object.schema]
  end

  if object.respond_to?(:to_hash)
    out = Typelike.modified_copy(object) do
      object.map do |key, value|
        {key => response_object_to_instances(value, initialize_options)}
      end.inject({}, &:update)
    end
    if model
      model.new(out, initialize_options)
    else
      out
    end
  elsif object.respond_to?(:to_ary)
    Typelike.modified_copy(object) do
      object.map do |element|
        response_object_to_instances(element, initialize_options)
      end
    end
  else
    object
  end
end

.update_class_and_instance_api_methods ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 216

def update_class_and_instance_api_methods
  openapi_document.paths.each do |path, path_item|
    path_item.each do |http_method, operation|
      next if http_method == 'parameters' # parameters is not an operation. TOOD maybe just select the keys that are http methods?
      operation.path = path
      operation.http_method = http_method
      method_name = method_names_by_operation[operation]
      # class method
      if operation_for_resource_class?(operation) && !respond_to?(method_name)
        define_singleton_method(method_name) do |call_params = nil|
          call_operation(operation, call_params: call_params)
        end
      end

      # instance method
      if operation_for_resource_instance?(operation) && !method_defined?(method_name)
        define_method(method_name) do |call_params = nil|
          call_operation(operation, call_params: call_params)
        end
      end
    end
  end
end

.update_dynamic_methods ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 141

def update_dynamic_methods
  update_class_and_instance_api_methods
  update_instance_accessors
end

.update_instance_accessors ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 150

def update_instance_accessors
  all_schema_properties.each do |property_name|
    unless method_defined?(property_name)
      define_method(property_name) do
        self[property_name]
      end
    end
    unless method_defined?(:"#{property_name}=")
      define_method(:"#{property_name}=") do |value|
        self[property_name] = value
      end
    end
  end
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 502

def [](key)
  @attributes[key]
end

#[]=(key, value) ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 506

def []=(key, value)
  @attributes[key] = value
end

#as_json ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 537

def as_json
  Typelike.as_json(@attributes)
end

#call_api_method(method_name, call_params: nil) ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 510

def call_api_method(method_name, call_params: nil)
  operation = self.class.method_names_by_operation.invert[method_name] || raise(ArgumentError)
  call_operation(operation, call_params: call_params)
end

#call_operation(operation, call_params: nil) ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 515

def call_operation(operation, call_params: nil)
  response = self.class.call_operation(operation, call_params: call_params, model_attributes: self.attributes)

  # if we're making a POST or PUT and the request schema is this resource, we'll assume that
  # the request is persisting this resource
  request_resource_is_self = operation.request_schema && self.class.represented_schemas.include?(operation.request_schema)
  if @options['response'] && @options['response'].status && operation.responses
    _, response_schema_node = operation.responses.detect { |k, v| k.to_s == @options['response'].status.to_s }
  end
  response_schema = Scorpio::Schema.new(response_schema_node) if response_schema_node
  response_resource_is_self = response_schema && self.class.represented_schemas.include?(response_schema)
  if request_resource_is_self && %w(put post).include?(operation.http_method.to_s.downcase)
    @persisted = true

    if response_resource_is_self
      @attributes = response.attributes
    end
  end

  response
end

#fingerprint ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 558

def fingerprint
  {class: self.class, attributes: Typelike.as_json(@attributes)}
end

#inspect ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 541

def inspect
  "\#<#{self.class.inspect} #{attributes.inspect}>"
end

#persisted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scorpio/resource_base.rb', line 498

def persisted?
  @persisted
end

#pretty_print(q) ⇒ Object 



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# File 'lib/scorpio/resource_base.rb', line 544

def pretty_print(q)
  q.instance_exec(self) do |obj|
    text "\#<#{obj.class.inspect}"
    group_sub {
      nest(2) {
        breakable ' '
        pp obj.attributes
      }
    }
    breakable ''
    text '>'
  end
end