Module: Stardust::GraphQL::Collector

Defined in:
lib/stardust/graphql/collector.rb

Constant Summary collapse

FIXED_TYPES = 
{
  any: ApolloFederation::Any,
  id: ::GraphQL::Types::ID,
  int: Integer,
  integer: Integer,
  float: Float,
  string: String,
  date: ::GraphQL::Types::ISO8601DateTime,
  datetime: ::GraphQL::Types::ISO8601DateTime,
  boolean: ::GraphQL::Types::Boolean,
}.freeze
@@__types__ = 
{}.merge(FIXED_TYPES)
@@__defined_types__ = 
[]
@@__queries__ = 
{}
@@__mutations__ = 
{}
@@__lookedup_types__ = 
[]

Class Method Summary collapse

Class Method Details

.add_mutation(name, mutation:) ⇒ Object 



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# File 'lib/stardust/graphql/collector.rb', line 79

def add_mutation(name, mutation:)
  if name.in?(@@__queries__.keys)
    raise "Mutation #{name.to_s} is already defined."
  end
  @@__mutations__[name] = mutation
end

.add_query(name, query:) ⇒ Object 



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# File 'lib/stardust/graphql/collector.rb', line 72

def add_query(name, query:)
  if name.in?(@@__queries__.keys)
    raise "Query #{name.to_s} is already defined."
  end
  @@__queries__[name] = query
end

.add_type(type, block, object_klass) ⇒ Object 



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# File 'lib/stardust/graphql/collector.rb', line 29

def add_type(type, block, object_klass)
  if type.in?(@@__types__.keys)
    raise "Type #{type.to_s} is alread defined."
  end

  @@__defined_types__ << type.to_s.camelize

  klass = nil
  if object_klass.is_a?(Class)
    klass = Class.new(object_klass, &block)
  else
    # interfaces are modules
    klass = Module.new
    klass.include(object_klass)
    klass.module_eval(&block)
    unless klass.graphql_name
      klass.graphql_name type.to_s.camelize
    end
  end

  begin
    klass.graphql_name
  rescue NotImplementedError
    klass.graphql_name(type.to_s.camelize)
  end

  ::Stardust::GraphQL::Types.const_set("#{type.to_s.camelize}", klass)
  @@__types__[type] = "Stardust::GraphQL::Types::#{type.to_s.camelize}".constantize
end

.clear_definitions! ⇒ Object 



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# File 'lib/stardust/graphql/collector.rb', line 59

def self.clear_definitions!

  @@__defined_types__.each do |type|
    Stardust::GraphQL::Types.send(:remove_const, type)
  end

  @@__defined_types__ = []
  @@__lookedup_types__ = []
  @@__types__ = {}.merge(FIXED_TYPES)
  @@__queries__ = {}
  @@__mutations__ = {}
end

.lookup_type(type) ⇒ Object

Raises:



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# File 'lib/stardust/graphql/collector.rb', line 98

def self.lookup_type(type)
  # puts "looking up #{type.class}: #{type}"

  if type.is_a?(Array)
    rest = type[1..-1]
    type = type.first
    is_a_array = true
  end

  raise MissingType, type.to_s unless @@__types__[type]

  @@__lookedup_types__ << type
  @@__lookedup_types__ = @@__lookedup_types__.uniq


  if is_a_array
    [@@__types__[type]] + rest
  else
    @@__types__[type]
  end
end

.mutations ⇒ Object 



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# File 'lib/stardust/graphql/collector.rb', line 94

def self.mutations
  @@__mutations__
end

.queries ⇒ Object 



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# File 'lib/stardust/graphql/collector.rb', line 90

def self.queries
  @@__queries__
end

.replace_types! ⇒ Object 



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# File 'lib/stardust/graphql/collector.rb', line 120

def self.replace_types!
  @@__types__.values.each do |klass|
    begin
      klass.replace_types! if klass.respond_to?(:replace_types!)
    rescue MissingType => e
      warn <<~TEXT

        Stardust Compilation Error
        Type #{e.message} is not defined.

      TEXT
    end
  end

  ## Here we define a new graphql type
  if Stardust::GraphQL.const_defined?("Schema")
    Stardust::GraphQL.send(:remove_const, "Schema")
  end

  klass = Class.new(::GraphQL::Schema) do
    include ::Stardust::GraphQL::Federated
    use ApolloFederation::Tracing
    use ::GraphQL::Batch

  end
  Stardust::GraphQL.const_set("Schema", klass)


  # a lot of this is extracted from apollo federation gem
  # to be used in stardust
  query_class = Class.new(::Stardust::GraphQL::Object) do
    graphql_name 'Query'

    include ApolloFederation::EntitiesField
    include ApolloFederation::ServiceField
  end

  possible_entities =
    @@__types__
    .values
    .select{|i| i < Stardust::GraphQL::Object}
    .map(&:to_graphql).select do |type|
      !type.introspection? && !type.default_scalar? &&
      type.metadata[:federation_directives]&.any? { |directive|
        directive[:name] == 'key'
      }
    end

  if !possible_entities.empty?
    entity_type = Class.new(ApolloFederation::Entity) do
      possible_types(*possible_entities)
    end

    @@__types__[:_frederated_entities] = entity_type

    query_class.field(:_entities, [:_frederated_entities, null: true], null: false) do
      argument :representations, [:any], required: true
    end
  end

  @@__queries__.each do |name, query|

    block = ->(field) {

      query.get_arguments.each do |name, type, description, kwargs, block|
        field.argument(name, type, description, **kwargs, &block)
      end

      field.instance_variable_set(:@resolver_class, query)
      field.instance_variable_set(:@resolver_method, :resolve)
      field.extension(Extensions::Authorize)
    }

    query_class.send(:field,
      name,
      query.get_type,
      query.get_description,
      null: query.get_null,
      &block
    )
  end

  begin
    query_class.replace_types!
  rescue MissingType => e
    warn <<~TEXT

      Stardust Compilation Error
      Type #{e.message} is not defined.

    TEXT
  end
  Stardust::GraphQL::Schema.query(query_class)


  mutation_class = Class.new(::GraphQL::Schema::Object)
  mutation_class.graphql_name("Mutation")
  @@__mutations__.each do |name, mutation|
    begin
      mutation.replace_types!
      mutation_class.send(:field, name, mutation: mutation )
    rescue MissingType => e
      warn <<~TEXT

        Stardust Compilation Error
        Type #{e.message} is not defined.

      TEXT
    end
  end
  Stardust::GraphQL::Schema.mutation(mutation_class)

  #
  # orphaned_types =
  #   @@__types__
  #   .select{|k,v|
  #     !k.in?(@@__lookedup_types__) &&
  #     v < Stardust::GraphQL::Object
  #   }
  #   .values
  #   .map(&:to_graphql)
  #
  # Stardust::GraphQL::Schema.orphan_types orphaned_types
end

.types ⇒ Object 



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# File 'lib/stardust/graphql/collector.rb', line 86

def self.types
  @@__types__
end