Class: GraphQL::Execution::Interpreter::Runtime Private

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/execution/interpreter/runtime.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

I think it would be even better if we could somehow make continue_field not recursive. “Trampolining” it somehow.

Defined Under Namespace

Modules: GraphQLResult Classes: CurrentState, GraphQLResultArray, GraphQLResultHash

Constant Summary collapse

NO_ARGS =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future. 

GraphQL::EmptyObjects::EMPTY_HASH
HALT =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future. 

Object.new

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(query:, lazies_at_depth:) ⇒ Runtime

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of Runtime.



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 194

def initialize(query:, lazies_at_depth:)
  @query = query
  @current_trace = query.current_trace
  @dataloader = query.multiplex.dataloader
  @lazies_at_depth = lazies_at_depth
  @schema = query.schema
  @context = query.context
  @response = GraphQLResultHash.new(nil, nil, false)
  # Identify runtime directives by checking which of this schema's directives have overridden `def self.resolve`
  @runtime_directive_names = []
  noop_resolve_owner = GraphQL::Schema::Directive.singleton_class
  @schema_directives = schema.directives
  @schema_directives.each do |name, dir_defn|
    if dir_defn.method(:resolve).owner != noop_resolve_owner
      @runtime_directive_names << name
    end
  end
  # A cache of { Class => { String => Schema::Field } }
  # Which assumes that MyObject.get_field("myField") will return the same field
  # during the lifetime of a query
  @fields_cache = Hash.new { |h, k| h[k] = {} }
  # this can by by-identity since owners are the same object, but not the sub-hash, which uses strings.
  @fields_cache.compare_by_identity
  # { Class => Boolean }
  @lazy_cache = {}
  @lazy_cache.compare_by_identity
end

Instance Attribute Details

#context ⇒ GraphQL::Query::Context (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 192

def context
  @context
end

#query ⇒ GraphQL::Query (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 186

def query
  @query
end

#schema ⇒ Class<GraphQL::Schema> (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 189

def schema
  @schema
end

Instance Method Details

#after_lazy(lazy_obj, field:, owner_object:, arguments:, ast_node:, result:, result_name:, eager: false, trace: true, &block) ⇒ GraphQL::Execution::Lazy, Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns If loading object will be deferred, it’s a wrapper over it.

Parameters:

  • obj (Object) —

    Some user-returned value that may want to be batched

  • field (GraphQL::Schema::Field)
  • eager (Boolean) (defaults to: false) —

    Set to true for mutation root fields only

  • trace (Boolean) (defaults to: true) —

    If false, don’t wrap this with field tracing

Returns:



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 972

def after_lazy(lazy_obj, field:, owner_object:, arguments:, ast_node:, result:, result_name:, eager: false, trace: true, &block)
  if lazy?(lazy_obj)
    orig_result = result
    lazy = GraphQL::Execution::Lazy.new(field: field) do
      st = get_current_runtime_state
      st.current_object = owner_object
      st.current_field = field
      st.current_arguments = arguments
      st.current_result_name = result_name
      st.current_result = orig_result
      # Wrap the execution of _this_ method with tracing,
      # but don't wrap the continuation below
      inner_obj = begin
        if trace
          @current_trace.execute_field_lazy(field: field, query: query, object: owner_object, arguments: arguments, ast_node: ast_node) do
            schema.sync_lazy(lazy_obj)
          end
        else
          schema.sync_lazy(lazy_obj)
        end
      rescue GraphQL::ExecutionError, GraphQL::UnauthorizedError => ex_err
        ex_err
      rescue StandardError => err
        begin
          query.handle_or_reraise(err)
        rescue GraphQL::ExecutionError => ex_err
          ex_err
        end
      end
      yield(inner_obj)
    end

    if eager
      lazy.value
    else
      set_result(result, result_name, lazy, false, false) # is_non_null is irrelevant here
      current_depth = 0
      while result
        current_depth += 1
        result = result.graphql_parent
      end
      @lazies_at_depth[current_depth] << lazy
      lazy
    end
  else
    # Don't need to reset state here because it _wasn't_ lazy.
    yield(lazy_obj)
  end
end

#arguments(graphql_object, arg_owner, ast_node) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 1022

def arguments(graphql_object, arg_owner, ast_node)
  if arg_owner.arguments_statically_coercible?
    query.arguments_for(ast_node, arg_owner)
  else
    # The arguments must be prepared in the context of the given object
    query.arguments_for(ast_node, arg_owner, parent_object: graphql_object)
  end
end

#authorized_new(type, value, context) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 1058

def authorized_new(type, value, context)
  type.authorized_new(value, context)
end

#call_method_on_directives(method_name, object, directives, &block) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 901

def call_method_on_directives(method_name, object, directives, &block)
  return yield if directives.nil? || directives.empty?
  run_directive(method_name, object, directives, 0, &block)
end

#continue_field(value, owner_type, field, current_type, ast_node, next_selections, is_non_null, owner_object, arguments, result_name, selection_result) ⇒ Lazy, ...

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

The resolver for field returned value. Continue to execute the query, treating value as type (probably the return type of the field).

Use next_selections to resolve object fields, if there are any.

Location information from path and ast_node.

Returns:

  • (Lazy, Array, Hash, Object) —

    Lazy, Array, and Hash are all traversed to resolve lazy values later



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 746

def continue_field(value, owner_type, field, current_type, ast_node, next_selections, is_non_null, owner_object, arguments, result_name, selection_result) # rubocop:disable Metrics/ParameterLists
  if current_type.non_null?
    current_type = current_type.of_type
    is_non_null = true
  end

  case current_type.kind.name
  when "SCALAR", "ENUM"
    r = begin
      current_type.coerce_result(value, context)
    rescue StandardError => err
      schema.handle_or_reraise(context, err)
    end
    set_result(selection_result, result_name, r, false, is_non_null)
    r
  when "UNION", "INTERFACE"
    resolved_type_or_lazy = resolve_type(current_type, value)
    after_lazy(resolved_type_or_lazy, ast_node: ast_node, field: field, owner_object: owner_object, arguments: arguments, trace: false, result_name: result_name, result: selection_result) do |resolved_type_result|
      if resolved_type_result.is_a?(Array) && resolved_type_result.length == 2
        resolved_type, resolved_value = resolved_type_result
      else
        resolved_type = resolved_type_result
        resolved_value = value
      end

      possible_types = query.possible_types(current_type)
      if !possible_types.include?(resolved_type)
        parent_type = field.owner_type
        err_class = current_type::UnresolvedTypeError
        type_error = err_class.new(resolved_value, field, parent_type, resolved_type, possible_types)
        schema.type_error(type_error, context)
        set_result(selection_result, result_name, nil, false, is_non_null)
        nil
      else
        continue_field(resolved_value, owner_type, field, resolved_type, ast_node, next_selections, is_non_null, owner_object, arguments, result_name, selection_result)
      end
    end
  when "OBJECT"
    object_proxy = begin
      authorized_new(current_type, value, context)
    rescue GraphQL::ExecutionError => err
      err
    end
    after_lazy(object_proxy, ast_node: ast_node, field: field, owner_object: owner_object, arguments: arguments, trace: false, result_name: result_name, result: selection_result) do |inner_object|
      continue_value = continue_value(inner_object, owner_type, field, is_non_null, ast_node, result_name, selection_result)
      if HALT != continue_value
        response_hash = GraphQLResultHash.new(result_name, selection_result, is_non_null)
        set_result(selection_result, result_name, response_hash, true, is_non_null)
        gathered_selections = gather_selections(continue_value, current_type, next_selections)
        # There are two possibilities for `gathered_selections`:
        # 1. All selections of this object should be evaluated together (there are no runtime directives modifying execution).
        #    This case is handled below, and the result can be written right into the main `response_hash` above.
        #    In this case, `gathered_selections` is a hash of selections.
        # 2. Some selections of this object have runtime directives that may or may not modify execution.
        #    That part of the selection is evaluated in an isolated way, writing into a sub-response object which is
        #    eventually merged into the final response. In this case, `gathered_selections` is an array of things to run in isolation.
        #    (Technically, it's possible that one of those entries _doesn't_ require isolation.)
        tap_or_each(gathered_selections) do |selections, is_selection_array|
          if is_selection_array
            this_result = GraphQLResultHash.new(result_name, selection_result, is_non_null)
            final_result = response_hash
          else
            this_result = response_hash
            final_result = nil
          end
          # reset this mutable state
          # Unset `result_name` here because it's already included in the new response hash
          st = get_current_runtime_state
          st.current_object = continue_value
          st.current_result_name = nil
          st.current_result = this_result

          # This is a less-frequent case; use a fast check since it's often not there.
          if (directives = selections[:graphql_directives])
            selections.delete(:graphql_directives)
          end
          call_method_on_directives(:resolve, continue_value, directives) do
            evaluate_selections(
              continue_value,
              current_type,
              false,
              selections,
              this_result,
              final_result,
              owner_object.object,
            )
            this_result
          end
        end
      end
    end
  when "LIST"
    inner_type = current_type.of_type
    # This is true for objects, unions, and interfaces
    use_dataloader_job = !inner_type.unwrap.kind.input?
    inner_type_non_null = inner_type.non_null?
    response_list = GraphQLResultArray.new(result_name, selection_result, is_non_null)
    set_result(selection_result, result_name, response_list, true, is_non_null)
    idx = nil
    list_value = begin
      value.each do |inner_value|
        idx ||= 0
        this_idx = idx
        idx += 1
        if use_dataloader_job
          @dataloader.append_job do
            resolve_list_item(inner_value, inner_type, inner_type_non_null, ast_node, field, owner_object, arguments, this_idx, response_list, next_selections, owner_type)
          end
        else
          resolve_list_item(inner_value, inner_type, inner_type_non_null, ast_node, field, owner_object, arguments, this_idx, response_list, next_selections, owner_type)
        end
      end

      response_list
    rescue NoMethodError => err
      # Ruby 2.2 doesn't have NoMethodError#receiver, can't check that one in this case. (It's been EOL since 2017.)
      if err.name == :each && (err.respond_to?(:receiver) ? err.receiver == value : true)
        # This happens when the GraphQL schema doesn't match the implementation. Help the dev debug.
        raise ListResultFailedError.new(value: value, field: field, path: current_path)
      else
        # This was some other NoMethodError -- let it bubble to reveal the real error.
        raise
      end
    rescue GraphQL::ExecutionError, GraphQL::UnauthorizedError => ex_err
      ex_err
    rescue StandardError => err
      begin
        query.handle_or_reraise(err)
      rescue GraphQL::ExecutionError => ex_err
        ex_err
      end
    end
    # Detect whether this error came while calling `.each` (before `idx` is set) or while running list *items* (after `idx` is set)
    error_is_non_null = idx.nil? ? is_non_null : inner_type.non_null?
    continue_value(list_value, owner_type, field, error_is_non_null, ast_node, result_name, selection_result)
  else
    raise "Invariant: Unhandled type kind #{current_type.kind} (#{current_type})"
  end
end

#continue_value(value, parent_type, field, is_non_null, ast_node, result_name, selection_result) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

rubocop:disable Metrics/ParameterLists



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 642

def continue_value(value, parent_type, field, is_non_null, ast_node, result_name, selection_result) # rubocop:disable Metrics/ParameterLists
  case value
  when nil
    if is_non_null
      set_result(selection_result, result_name, nil, false, is_non_null) do
        # This block is called if `result_name` is not dead. (Maybe a previous invalid nil caused it be marked dead.)
        err = parent_type::InvalidNullError.new(parent_type, field, value)
        schema.type_error(err, context)
      end
    else
      set_result(selection_result, result_name, nil, false, is_non_null)
    end
    HALT
  when GraphQL::Error
    # Handle these cases inside a single `when`
    # to avoid the overhead of checking three different classes
    # every time.
    if value.is_a?(GraphQL::ExecutionError)
      if selection_result.nil? || !dead_result?(selection_result)
        value.path ||= current_path
        value.ast_node ||= ast_node
        context.errors << value
        if selection_result
          set_result(selection_result, result_name, nil, false, is_non_null)
        end
      end
      HALT
    elsif value.is_a?(GraphQL::UnauthorizedFieldError)
      value.field ||= field
      # this hook might raise & crash, or it might return
      # a replacement value
      next_value = begin
        schema.unauthorized_field(value)
      rescue GraphQL::ExecutionError => err
        err
      end
      continue_value(next_value, parent_type, field, is_non_null, ast_node, result_name, selection_result)
    elsif value.is_a?(GraphQL::UnauthorizedError)
      # this hook might raise & crash, or it might return
      # a replacement value
      next_value = begin
        schema.unauthorized_object(value)
      rescue GraphQL::ExecutionError => err
        err
      end
      continue_value(next_value, parent_type, field, is_non_null, ast_node, result_name, selection_result)
    elsif GraphQL::Execution::SKIP == value
      # It's possible a lazy was already written here
      case selection_result
      when GraphQLResultHash
        selection_result.delete(result_name)
      when GraphQLResultArray
        selection_result.graphql_skip_at(result_name)
      when nil
        # this can happen with directives
      else
        raise "Invariant: unexpected result class #{selection_result.class} (#{selection_result.inspect})"
      end
      HALT
    else
      # What could this actually _be_? Anyhow,
      # preserve the default behavior of doing nothing with it.
      value
    end
  when Array
    # It's an array full of execution errors; add them all.
    if value.any? && value.all? { |v| v.is_a?(GraphQL::ExecutionError) }
      list_type_at_all = (field && (field.type.list?))
      if selection_result.nil? || !dead_result?(selection_result)
        value.each_with_index do |error, index|
          error.ast_node ||= ast_node
          error.path ||= current_path + (list_type_at_all ? [index] : [])
          context.errors << error
        end
        if selection_result
          if list_type_at_all
            result_without_errors = value.map { |v| v.is_a?(GraphQL::ExecutionError) ? nil : v }
            set_result(selection_result, result_name, result_without_errors, false, is_non_null)
          else
            set_result(selection_result, result_name, nil, false, is_non_null)
          end
        end
      end
      HALT
    else
      value
    end
  when GraphQL::Execution::Interpreter::RawValue
    # Write raw value directly to the response without resolving nested objects
    set_result(selection_result, result_name, value.resolve, false, is_non_null)
    HALT
  else
    value
  end
end

#current_path ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 630

def current_path
  st = get_current_runtime_state
  result = st.current_result
  path = result && result.path
  if path && (rn = st.current_result_name)
    path = path.dup
    path.push(rn)
  end
  path
end

#dead_result?(selection_result) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/graphql/execution/interpreter/runtime.rb', line 583

def dead_result?(selection_result)
  selection_result.graphql_dead  # || ((parent = selection_result.graphql_parent) && parent.graphql_dead)
end

#delete_all_interpreter_context ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 1031

def delete_all_interpreter_context
  per_query_state = Thread.current[:__graphql_runtime_info]
  if per_query_state
    per_query_state.delete(@query)
    if per_query_state.size == 0
      Thread.current[:__graphql_runtime_info] = nil
    end
  end
  nil
end

#directives_include?(node, graphql_object, parent_type) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Check Schema::Directive.include? for each directive that’s present

Returns:

  • (Boolean) 


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# File 'lib/graphql/execution/interpreter/runtime.rb', line 934

def directives_include?(node, graphql_object, parent_type)
  node.directives.each do |dir_node|
    dir_defn = @schema_directives.fetch(dir_node.name)
    args = arguments(graphql_object, dir_defn, dir_node)
    if !dir_defn.include?(graphql_object, args, context)
      return false
    end
  end
  true
end

#evaluate_selection(result_name, field_ast_nodes_or_ast_node, owner_object, owner_type, is_eager_field, selections_result, parent_object) ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 408

def evaluate_selection(result_name, field_ast_nodes_or_ast_node, owner_object, owner_type, is_eager_field, selections_result, parent_object) # rubocop:disable Metrics/ParameterLists
  return if dead_result?(selections_result)
  # As a performance optimization, the hash key will be a `Node` if
  # there's only one selection of the field. But if there are multiple
  # selections of the field, it will be an Array of nodes
  if field_ast_nodes_or_ast_node.is_a?(Array)
    field_ast_nodes = field_ast_nodes_or_ast_node
    ast_node = field_ast_nodes.first
  else
    field_ast_nodes = nil
    ast_node = field_ast_nodes_or_ast_node
  end
  field_name = ast_node.name
  # This can't use `query.get_field` because it gets confused on introspection below if `field_defn` isn't `nil`,
  # because of how `is_introspection` is used to call `.authorized_new` later on.
  field_defn = @fields_cache[owner_type][field_name] ||= owner_type.get_field(field_name, @context)
  is_introspection = false
  if field_defn.nil?
    field_defn = if owner_type == schema.query && (entry_point_field = schema.introspection_system.entry_point(name: field_name))
      is_introspection = true
      entry_point_field
    elsif (dynamic_field = schema.introspection_system.dynamic_field(name: field_name))
      is_introspection = true
      dynamic_field
    else
      raise "Invariant: no field for #{owner_type}.#{field_name}"
    end
  end

  return_type = field_defn.type

  # This seems janky, but we need to know
  # the field's return type at this path in order
  # to propagate `null`
  return_type_non_null = return_type.non_null?
  # Set this before calling `run_with_directives`, so that the directive can have the latest path
  st = get_current_runtime_state
  st.current_field = field_defn
  st.current_result = selections_result
  st.current_result_name = result_name

  object = owner_object

  if is_introspection
    object = authorized_new(field_defn.owner, object, context)
  end

  total_args_count = field_defn.arguments(context).size
  if total_args_count == 0
    resolved_arguments = GraphQL::Execution::Interpreter::Arguments::EMPTY
    if field_defn.extras.size == 0
      evaluate_selection_with_resolved_keyword_args(
        NO_ARGS, resolved_arguments, field_defn, ast_node, field_ast_nodes, owner_type, object, is_eager_field, result_name, selections_result, parent_object, return_type, return_type_non_null
      )
    else
      evaluate_selection_with_args(resolved_arguments, field_defn, ast_node, field_ast_nodes, owner_type, object, is_eager_field, result_name, selections_result, parent_object, return_type, return_type_non_null)
    end
  else
    @query.arguments_cache.dataload_for(ast_node, field_defn, object) do |resolved_arguments|
      evaluate_selection_with_args(resolved_arguments, field_defn, ast_node, field_ast_nodes, owner_type, object, is_eager_field, result_name, selections_result, parent_object, return_type, return_type_non_null)
    end
  end
end

#evaluate_selection_with_args(arguments, field_defn, ast_node, field_ast_nodes, owner_type, object, is_eager_field, result_name, selection_result, parent_object, return_type, return_type_non_null) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

rubocop:disable Metrics/ParameterLists



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 472

def evaluate_selection_with_args(arguments, field_defn, ast_node, field_ast_nodes, owner_type, object, is_eager_field, result_name, selection_result, parent_object, return_type, return_type_non_null)  # rubocop:disable Metrics/ParameterLists
  after_lazy(arguments, field: field_defn, ast_node: ast_node, owner_object: object, arguments: arguments, result_name: result_name, result: selection_result) do |resolved_arguments|
    if resolved_arguments.is_a?(GraphQL::ExecutionError) || resolved_arguments.is_a?(GraphQL::UnauthorizedError)
      continue_value(resolved_arguments, owner_type, field_defn, return_type_non_null, ast_node, result_name, selection_result)
      next
    end

    kwarg_arguments = if field_defn.extras.empty?
      if resolved_arguments.empty?
        # We can avoid allocating the `{ Symbol => Object }` hash in this case
        NO_ARGS
      else
        resolved_arguments.keyword_arguments
      end
    else
      # Bundle up the extras, then make a new arguments instance
      # that includes the extras, too.
      extra_args = {}
      field_defn.extras.each do |extra|
        case extra
        when :ast_node
          extra_args[:ast_node] = ast_node
        when :execution_errors
          extra_args[:execution_errors] = ExecutionErrors.new(context, ast_node, current_path)
        when :path
          extra_args[:path] = current_path
        when :lookahead
          if !field_ast_nodes
            field_ast_nodes = [ast_node]
          end

          extra_args[:lookahead] = Execution::Lookahead.new(
            query: query,
            ast_nodes: field_ast_nodes,
            field: field_defn,
          )
        when :argument_details
          # Use this flag to tell Interpreter::Arguments to add itself
          # to the keyword args hash _before_ freezing everything.
          extra_args[:argument_details] = :__arguments_add_self
        when :parent
          extra_args[:parent] = parent_object
        else
          extra_args[extra] = field_defn.fetch_extra(extra, context)
        end
      end
      if extra_args.any?
        resolved_arguments = resolved_arguments.merge_extras(extra_args)
      end
      resolved_arguments.keyword_arguments
    end

    evaluate_selection_with_resolved_keyword_args(kwarg_arguments, resolved_arguments, field_defn, ast_node, field_ast_nodes, owner_type, object, is_eager_field, result_name, selection_result, parent_object, return_type, return_type_non_null)
  end
end

#evaluate_selection_with_resolved_keyword_args(kwarg_arguments, resolved_arguments, field_defn, ast_node, field_ast_nodes, owner_type, object, is_eager_field, result_name, selection_result, parent_object, return_type, return_type_non_null) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

rubocop:disable Metrics/ParameterLists



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 528

def evaluate_selection_with_resolved_keyword_args(kwarg_arguments, resolved_arguments, field_defn, ast_node, field_ast_nodes, owner_type, object, is_eager_field, result_name, selection_result, parent_object, return_type, return_type_non_null)  # rubocop:disable Metrics/ParameterLists
  st = get_current_runtime_state
  st.current_field = field_defn
  st.current_object = object
  st.current_arguments = resolved_arguments
  st.current_result_name = result_name
  st.current_result = selection_result
  # Optimize for the case that field is selected only once
  if field_ast_nodes.nil? || field_ast_nodes.size == 1
    next_selections = ast_node.selections
    directives = ast_node.directives
  else
    next_selections = []
    directives = []
    field_ast_nodes.each { |f|
      next_selections.concat(f.selections)
      directives.concat(f.directives)
    }
  end

  field_result = call_method_on_directives(:resolve, object, directives) do
    # Actually call the field resolver and capture the result
    app_result = begin
      @current_trace.execute_field(field: field_defn, ast_node: ast_node, query: query, object: object, arguments: kwarg_arguments) do
        field_defn.resolve(object, kwarg_arguments, context)
      end
    rescue GraphQL::ExecutionError => err
      err
    rescue StandardError => err
      begin
        query.handle_or_reraise(err)
      rescue GraphQL::ExecutionError => ex_err
        ex_err
      end
    end
    after_lazy(app_result, field: field_defn, ast_node: ast_node, owner_object: object, arguments: resolved_arguments, result_name: result_name, result: selection_result) do |inner_result|
      continue_value = continue_value(inner_result, owner_type, field_defn, return_type_non_null, ast_node, result_name, selection_result)
      if HALT != continue_value
        continue_field(continue_value, owner_type, field_defn, return_type, ast_node, next_selections, false, object, resolved_arguments, result_name, selection_result)
      end
    end
  end

  # If this field is a root mutation field, immediately resolve
  # all of its child fields before moving on to the next root mutation field.
  # (Subselections of this mutation will still be resolved level-by-level.)
  if is_eager_field
    Interpreter::Resolve.resolve_all([field_result], @dataloader)
  else
    # Return this from `after_lazy` because it might be another lazy that needs to be resolved
    field_result
  end
end

#evaluate_selections(owner_object, owner_type, is_eager_selection, gathered_selections, selections_result, target_result, parent_object) ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 378

def evaluate_selections(owner_object, owner_type, is_eager_selection, gathered_selections, selections_result, target_result, parent_object) # rubocop:disable Metrics/ParameterLists
  st = get_current_runtime_state
  st.current_object = owner_object
  st.current_result_name = nil
  st.current_result = selections_result

  finished_jobs = 0
  enqueued_jobs = gathered_selections.size
  gathered_selections.each do |result_name, field_ast_nodes_or_ast_node|
    @dataloader.append_job {
      evaluate_selection(
        result_name, field_ast_nodes_or_ast_node, owner_object, owner_type, is_eager_selection, selections_result, parent_object
      )
      finished_jobs += 1
      if target_result && finished_jobs == enqueued_jobs
        selections_result.merge_into(target_result)
      end
    }
    # Field resolution may pause the fiber,
    # so it wouldn't get to the `Resolve` call that happens below.
    # So instead trigger a run from this outer context.
    if is_eager_selection
      @dataloader.run
    end
  end

  selections_result
end

#final_result ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 222

def final_result
  @response && @response.graphql_result_data
end

#gather_selections(owner_object, owner_type, selections, selections_to_run = nil, selections_by_name = {}) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 302

def gather_selections(owner_object, owner_type, selections, selections_to_run = nil, selections_by_name = {})
  selections.each do |node|
    # Skip gathering this if the directive says so
    if !directives_include?(node, owner_object, owner_type)
      next
    end

    if node.is_a?(GraphQL::Language::Nodes::Field)
      response_key = node.alias || node.name
      selections = selections_by_name[response_key]
      # if there was already a selection of this field,
      # use an array to hold all selections,
      # otherise, use the single node to represent the selection
      if selections
        # This field was already selected at least once,
        # add this node to the list of selections
        s = Array(selections)
        s << node
        selections_by_name[response_key] = s
      else
        # No selection was found for this field yet
        selections_by_name[response_key] = node
      end
    else
      # This is an InlineFragment or a FragmentSpread
      if @runtime_directive_names.any? && node.directives.any? { |d| @runtime_directive_names.include?(d.name) }
        next_selections = {}
        next_selections[:graphql_directives] = node.directives
        if selections_to_run
          selections_to_run << next_selections
        else
          selections_to_run = []
          selections_to_run << selections_by_name
          selections_to_run << next_selections
        end
      else
        next_selections = selections_by_name
      end

      case node
      when GraphQL::Language::Nodes::InlineFragment
        if node.type
          type_defn = schema.get_type(node.type.name, context)

          # Faster than .map{}.include?()
          query.warden.possible_types(type_defn).each do |t|
            if t == owner_type
              gather_selections(owner_object, owner_type, node.selections, selections_to_run, next_selections)
              break
            end
          end
        else
          # it's an untyped fragment, definitely continue
          gather_selections(owner_object, owner_type, node.selections, selections_to_run, next_selections)
        end
      when GraphQL::Language::Nodes::FragmentSpread
        fragment_def = query.fragments[node.name]
        type_defn = query.get_type(fragment_def.type.name)
        possible_types = query.warden.possible_types(type_defn)
        possible_types.each do |t|
          if t == owner_type
            gather_selections(owner_object, owner_type, fragment_def.selections, selections_to_run, next_selections)
            break
          end
        end
      else
        raise "Invariant: unexpected selection class: #{node.class}"
      end
    end
  end
  selections_to_run || selections_by_name
end

#get_current_runtime_state ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 945

def get_current_runtime_state
  current_state = Thread.current[:__graphql_runtime_info] ||= begin
    per_query_state = {}
    per_query_state.compare_by_identity
    per_query_state
  end

  current_state[@query] ||= CurrentState.new
end

#inspect ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 226

def inspect
  "#<#{self.class.name} response=#{@response.inspect}>"
end

#lazy?(object) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/graphql/execution/interpreter/runtime.rb', line 1062

def lazy?(object)
  obj_class = object.class
  is_lazy = @lazy_cache[obj_class]
  if is_lazy.nil?
    is_lazy = @lazy_cache[obj_class] = @schema.lazy?(object)
  end
  is_lazy
end

#minimal_after_lazy(value, &block) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 955

def minimal_after_lazy(value, &block)
  if lazy?(value)
    GraphQL::Execution::Lazy.new do
      result = @schema.sync_lazy(value)
      # The returned result might also be lazy, so check it, too
      minimal_after_lazy(result, &block)
    end
  else
    yield(value)
  end
end

#resolve_list_item(inner_value, inner_type, inner_type_non_null, ast_node, field, owner_object, arguments, this_idx, response_list, next_selections, owner_type) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

rubocop:disable Metrics/ParameterLists



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 886

def resolve_list_item(inner_value, inner_type, inner_type_non_null, ast_node, field, owner_object, arguments, this_idx, response_list, next_selections, owner_type) # rubocop:disable Metrics/ParameterLists
  st = get_current_runtime_state
  st.current_result_name = this_idx
  st.current_result = response_list
  call_method_on_directives(:resolve_each, owner_object, ast_node.directives) do
    # This will update `response_list` with the lazy
    after_lazy(inner_value, ast_node: ast_node, field: field, owner_object: owner_object, arguments: arguments, result_name: this_idx, result: response_list) do |inner_inner_value|
      continue_value = continue_value(inner_inner_value, owner_type, field, inner_type_non_null, ast_node, this_idx, response_list)
      if HALT != continue_value
        continue_field(continue_value, owner_type, field, inner_type, ast_node, next_selections, false, owner_object, arguments, this_idx, response_list)
      end
    end
  end
end

#resolve_type(type, value) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 1042

def resolve_type(type, value)
  resolved_type, resolved_value = @current_trace.resolve_type(query: query, type: type, object: value) do
    query.resolve_type(type, value)
  end

  if lazy?(resolved_type)
    GraphQL::Execution::Lazy.new do
      @current_trace.resolve_type_lazy(query: query, type: type, object: value) do
        schema.sync_lazy(resolved_type)
      end
    end
  else
    [resolved_type, resolved_value]
  end
end

#run_directive(method_name, object, directives, idx, &block) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 906

def run_directive(method_name, object, directives, idx, &block)
  dir_node = directives[idx]
  if !dir_node
    yield
  else
    dir_defn = @schema_directives.fetch(dir_node.name)
    raw_dir_args = arguments(nil, dir_defn, dir_node)
    dir_args = continue_value(
      raw_dir_args, # value
      dir_defn, # parent_type
      nil, # field
      false, # is_non_null
      dir_node, # ast_node
      nil, # result_name
      nil, # selection_result
    )

    if dir_args == HALT
      nil
    else
      dir_defn.public_send(method_name, object, dir_args, context) do
        run_directive(method_name, object, directives, idx + 1, &block)
      end
    end
  end
end

#run_eager ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

This begins the execution. Some deferred work might be stored up in lazies.



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 243

def run_eager
  root_operation = query.selected_operation
  root_op_type = root_operation.operation_type || "query"
  root_type = schema.root_type_for_operation(root_op_type)
  st = get_current_runtime_state
  st.current_object = query.root_value
  st.current_result = @response
  object_proxy = authorized_new(root_type, query.root_value, context)
  object_proxy = schema.sync_lazy(object_proxy)

  if object_proxy.nil?
    # Root .authorized? returned false.
    @response = nil
  else
    call_method_on_directives(:resolve, object_proxy, root_operation.directives) do # execute query level directives
      gathered_selections = gather_selections(object_proxy, root_type, root_operation.selections)
      # This is kind of a hack -- `gathered_selections` is an Array if any of the selections
      # require isolation during execution (because of runtime directives). In that case,
      # make a new, isolated result hash for writing the result into. (That isolated response
      # is eventually merged back into the main response)
      #
      # Otherwise, `gathered_selections` is a hash of selections which can be
      # directly evaluated and the results can be written right into the main response hash.
      tap_or_each(gathered_selections) do |selections, is_selection_array|
        if is_selection_array
          selection_response = GraphQLResultHash.new(nil, nil, false)
          final_response = @response
        else
          selection_response = @response
          final_response = nil
        end

        @dataloader.append_job {
          st = get_current_runtime_state
          st.current_object = query.root_value
          st.current_result = selection_response
          # This is a less-frequent case; use a fast check since it's often not there.
          if (directives = selections[:graphql_directives])
            selections.delete(:graphql_directives)
          end
          call_method_on_directives(:resolve, object_proxy, directives) do
            evaluate_selections(
              object_proxy,
              root_type,
              root_op_type == "mutation",
              selections,
              selection_response,
              final_response,
              nil,
            )
          end
        }
      end
    end
  end
  delete_all_interpreter_context
  nil
end

#set_graphql_dead(selection_result) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Mark this node and any already-registered children as dead, so that it accepts no more writes.



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 617

def set_graphql_dead(selection_result)
  case selection_result
  when GraphQLResultArray
    selection_result.graphql_dead = true
    selection_result.values.each { |v| set_graphql_dead(v) }
  when GraphQLResultHash
    selection_result.graphql_dead = true
    selection_result.each { |k, v| set_graphql_dead(v) }
  else
    # It's a scalar, no way to mark it dead.
  end
end

#set_result(selection_result, result_name, value, is_child_result, is_non_null) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 587

def set_result(selection_result, result_name, value, is_child_result, is_non_null)
  if !dead_result?(selection_result)
    if value.nil? && is_non_null
      # This is an invalid nil that should be propagated
      # One caller of this method passes a block,
      # namely when application code returns a `nil` to GraphQL and it doesn't belong there.
      # The other possibility for reaching here is when a field returns an ExecutionError, so we write
      # `nil` to the response, not knowing whether it's an invalid `nil` or not.
      # (And in that case, we don't have to call the schema's handler, since it's not a bug in the application.)
      # TODO the code is trying to tell me something.
      yield if block_given?
      parent = selection_result.graphql_parent
      if parent.nil? # This is a top-level result hash
        @response = nil
      else
        name_in_parent = selection_result.graphql_result_name
        is_non_null_in_parent = selection_result.graphql_is_non_null_in_parent
        set_result(parent, name_in_parent, nil, false, is_non_null_in_parent)
        set_graphql_dead(selection_result)
      end
    elsif is_child_result
      selection_result.set_child_result(result_name, value)
    else
      selection_result.set_leaf(result_name, value)
    end
  end
end

#tap_or_each(obj_or_array) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 230

def tap_or_each(obj_or_array)
  if obj_or_array.is_a?(Array)
    obj_or_array.each do |item|
      yield(item, true)
    end
  else
    yield(obj_or_array, false)
  end
end