Class: GraphQL::Execution::FieldResolveStep

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parent_type:, runner:, key:, selections_step:) ⇒ FieldResolveStep

Returns a new instance of FieldResolveStep.



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# File 'lib/graphql/execution/field_resolve_step.rb', line 5

def initialize(parent_type:, runner:, key:, selections_step:)
  @selections_step = selections_step
  @key = key
  @parent_type = parent_type
  @ast_node = @ast_nodes = nil
  @runner = runner
  @field_definition = nil
  @arguments = nil
  @field_results = nil
  @path = nil
  @enqueued_authorization = false
  @all_next_objects = nil
  @all_next_results = nil
  @static_type = nil
  @next_selections = nil
  @results = nil
  @finish_extension_idx = nil
  @was_scoped = nil
  @pending_steps = nil
  @post_processors = @directive_finalizers = nil
end

Instance Attribute Details

#arguments ⇒ Object

Returns the value of attribute arguments.



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# File 'lib/graphql/execution/field_resolve_step.rb', line 30

def arguments
  @arguments
end

#ast_node ⇒ Object (readonly)

Returns the value of attribute ast_node.



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# File 'lib/graphql/execution/field_resolve_step.rb', line 27

def ast_node
  @ast_node
end

#field_definition ⇒ Object (readonly)

Returns the value of attribute field_definition.



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# File 'lib/graphql/execution/field_resolve_step.rb', line 27

def field_definition
  @field_definition
end

#field_results ⇒ Object (readonly)

Returns the value of attribute field_results.



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# File 'lib/graphql/execution/field_resolve_step.rb', line 27

def field_results
  @field_results
end

#key ⇒ Object (readonly)

Returns the value of attribute key.



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# File 'lib/graphql/execution/field_resolve_step.rb', line 27

def key
  @key
end

#object_is_authorized ⇒ Object (readonly)

Returns the value of attribute object_is_authorized.



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# File 'lib/graphql/execution/field_resolve_step.rb', line 27

def object_is_authorized
  @object_is_authorized
end

#parent_type ⇒ Object (readonly)

Returns the value of attribute parent_type.



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# File 'lib/graphql/execution/field_resolve_step.rb', line 27

def parent_type
  @parent_type
end

#pending_steps ⇒ Object

Returns the value of attribute pending_steps.



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# File 'lib/graphql/execution/field_resolve_step.rb', line 30

def pending_steps
  @pending_steps
end

#runner ⇒ Object (readonly)

Returns the value of attribute runner.



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# File 'lib/graphql/execution/field_resolve_step.rb', line 27

def runner
  @runner
end

#selections_step ⇒ Object (readonly)

Returns the value of attribute selections_step.



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# File 'lib/graphql/execution/field_resolve_step.rb', line 27

def selections_step
  @selections_step
end

#static_type ⇒ Object

Returns the value of attribute static_type.



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# File 'lib/graphql/execution/field_resolve_step.rb', line 30

def static_type
  @static_type
end

#was_scoped ⇒ Object (readonly)

Returns the value of attribute was_scoped.



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# File 'lib/graphql/execution/field_resolve_step.rb', line 27

def was_scoped
  @was_scoped
end

Instance Method Details

#add_graphql_error(err) ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 99

def add_graphql_error(err)
  err.path = path
  err.ast_nodes = ast_nodes
  @selections_step.query.context.add_error(err)
  err
end

#add_non_null_error(is_from_array) ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 471

def add_non_null_error(is_from_array)
  err = InvalidNullError.new(@parent_type, @field_definition, ast_nodes, is_from_array: is_from_array, path: path)
  @runner.schema.type_error(err, @selections_step.query.context)
end

#any_lazy_results? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/graphql/execution/field_resolve_step.rb', line 277

def any_lazy_results?
  lazies = false
  if @runner.resolves_lazies # TODO extract this
    @field_results.each do |field_result|
      if @runner.lazy?(field_result)
        lazies = true
        break
      elsif field_result.is_a?(Array)
        field_result.each do |inner_fr|
          if @runner.lazy?(inner_fr)
            break lazies = true
          end
        end
        if lazies
          break
        end
      end
    end
  end
  lazies
end

#append_selection(ast_node) ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 40

def append_selection(ast_node)
  if @ast_node.nil?
    @ast_node = ast_node
  elsif @ast_nodes.nil?
    @ast_nodes = [@ast_node, ast_node]
  else
    @ast_nodes << ast_node
  end
  nil
end

#ast_nodes ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 36

def ast_nodes
  @ast_nodes ||= [@ast_node]
end

#authorized_finished(step) ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 464

def authorized_finished(step)
  @pending_steps.delete(step)
  if @enqueued_authorization && @pending_steps.size == 0
    @runner.add_step(self)
  end
end

#build_arguments ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 106

def build_arguments
  query = @selections_step.query
  field_name = @ast_node.name
  @field_definition = query.types.field(@parent_type, field_name) || raise("Invariant: no field found for #{@parent_type.to_type_signature}.#{ast_node.name}")
  arguments = @runner.input_values[query].argument_values(@field_definition, @ast_node.arguments, self) # rubocop:disable Development/ContextIsPassedCop
  @arguments ||= arguments # may have already been set to an error

  if (@pending_steps.nil? || @pending_steps.size == 0) &&
      @field_results.nil? # Make sure the arguments flow didn't already call through
    execute_field
  end
end

#build_results ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 340

def build_results
  return_type = @field_definition.type
  return_result_type = return_type.unwrap

  @post_processors&.each do |post_processor|
    @field_results = post_processor.after_resolve(@field_results)
  end

  if return_result_type.kind.composite?
    @static_type = return_result_type
    if @ast_nodes
      @next_selections = []
      @ast_nodes.each do |ast_node|
        @next_selections.concat(ast_node.selections)
      end
    else
      @next_selections = @ast_node.selections
    end

    @all_next_objects = []
    @all_next_results = []

    is_list = return_type.list?
    is_non_null = return_type.non_null?
    i = 0
    s = @results.size
    while i < s do
      result_h = @results[i]
      result = @field_results[i]
      i += 1
      build_graphql_result(result_h, @key, result, return_type, is_non_null, is_list, false)
    end
    @enqueued_authorization = true

    if @pending_steps.nil? || @pending_steps.size == 0
      enqueue_next_steps
    else
      # Do nothing -- it will enqueue itself later
    end
  else
    ctx = @selections_step.query.context
    i = 0
    s = @results.size
    while i < s do
      result_h = @results[i]
      field_result = @field_results[i]
      i += 1
      finish_leaf_result(result_h, @key, field_result, return_type, ctx)
    end
  end
end

#call ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 78

def call
  if @enqueued_authorization
    enqueue_next_steps
  elsif @finish_extension_idx
    finish_extensions
  elsif @field_results
    build_results
  elsif @arguments
    execute_field
  else
    build_arguments
  end
rescue StandardError => err
  if @field_definition && !err.message.start_with?("Resolving ")
    # TODO remove this check ^^^^^^ when NullDataloader isn't recursive
    raise err, "Resolving #{@field_definition.path}: #{err.message}", err.backtrace
  else
    raise
  end
end

#enqueue_next_steps ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 415

def enqueue_next_steps
  if !@all_next_results.empty?
    @all_next_objects.compact!

    query = @selections_step.query
    ctx = query.context
    if @static_type.kind.abstract?
      next_objects_by_type = Hash.new { |h, obj_t| h[obj_t] = [] }.compare_by_identity
      next_results_by_type = Hash.new { |h, obj_t| h[obj_t] = [] }.compare_by_identity

      @all_next_objects.each_with_index do |next_object, i|
        result = @all_next_results[i]
        if (object_type = @runner.runtime_type_at[result])
          # OK
        else
          object_type = @runner.resolve_type(@static_type, next_object, query)
          @runner.runtime_type_at[result] = object_type
        end
        next_objects_by_type[object_type] << next_object
        next_results_by_type[object_type] << result
      end

      next_objects_by_type.each do |obj_type, next_objects|
        query.current_trace.objects(obj_type, next_objects, ctx)
        @runner.add_step(SelectionsStep.new(
          path: path,
          parent_type: obj_type,
          selections: @next_selections,
          objects: next_objects,
          results: next_results_by_type[obj_type],
          runner: @runner,
          query: query,
        ))
      end
    else
      query.current_trace.objects(@static_type, @all_next_objects, ctx)
      @runner.add_step(SelectionsStep.new(
        path: path,
        parent_type: @static_type,
        selections: @next_selections,
        objects: @all_next_objects,
        results: @all_next_results,
        runner: @runner,
        query: query,
      ))
    end
  end
end

#execute_field ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 119

def execute_field
  objects = @selections_step.objects
  @results = @selections_step.results
  # TODO not as good because only one error?
  if @arguments.is_a?(GraphQL::RuntimeError)
    @field_results = Array.new(objects.size, @arguments)
    build_results
    return
  end

  query = @selections_step.query
  ctx = query.context
  if (v = @field_definition.validators).any?  # rubocop:disable Development/NoneWithoutBlockCop
    begin
      Schema::Validator.validate!(v, nil, ctx, @arguments)
    rescue GraphQL::RuntimeError => err
      @field_results = Array.new(objects.size, err)
      build_results
      return
    end
  end

  @field_definition.extras.each do |extra|
    case extra
    when :lookahead
      if @arguments.frozen?
        @arguments = @arguments.dup
      end
      @arguments[:lookahead] = Execution::Lookahead.new(
        query: query,
        ast_nodes: ast_nodes,
        field: @field_definition,
      )
    when :ast_node
      if @arguments.frozen?
        @arguments = @arguments.dup
      end
      @arguments[:ast_node] = ast_node
    else
      raise ArgumentError, "This `extra` isn't supported yet: #{extra.inspect}. Open an issue on GraphQL-Ruby to add compatibility for it."
    end
  end

  if @field_definition.dynamic_introspection
    # TODO break this backwards compat somehow?
    objects = @selections_step.graphql_objects
  end

  if @runner.authorization && @runner.authorizes?(@field_definition, ctx)
    authorized_objects = []
    authorized_results = []
    l = objects.size
    i = 0
    while i < l
      o = objects[i]
      if @field_definition.authorized?(o, @arguments, ctx)
        authorized_results << @results[i]
        authorized_objects << o
      else
        begin
          err = GraphQL::UnauthorizedFieldError.new(object: o, type: @parent_type, context: ctx, field: @field_definition)
          authorized_objects << query.schema.unauthorized_object(err)
          authorized_results << @results[i]
        rescue GraphQL::ExecutionError => exec_err
          add_graphql_error(exec_err)
        end
      end
      i += 1
    end

    if authorized_objects.size == 0
      return
    end
    @results = authorized_results
  else
    authorized_objects = objects
  end

  if @parent_type.default_relay? && authorized_objects.all? { |o| o.respond_to?(:was_authorized_by_scope_items?) && o.was_authorized_by_scope_items? }
    @was_scoped = true
  end

  query.current_trace.begin_execute_field(@field_definition, @arguments, authorized_objects, query)

  if @runner.uses_runtime_directives
    if @ast_nodes.nil? || @ast_nodes.size == 1
      directives = if !@ast_node.directives.empty?
        @ast_node.directives
      else
        nil
      end
    else
      directives = nil
      @ast_nodes.each do |n|
        if (d = n.directives).any? # rubocop:disable Development/NoneWithoutBlockCop
          directives ||= []
          directives.concat(d)
        end
      end
    end

    if directives
      directives.each do |dir_node|
        if (dir_defn = @runner.runtime_directives[dir_node.name])
          # TODO: `coerce_arguments` modifies self, assuming it's field arguments. Extract to pure function for use
          # here and with fragments.
          dir_args = @runner.input_values[query].argument_values(dir_defn, dir_node.arguments, nil)  # rubocop:disable Development/ContextIsPassedCop
          result = dir_defn.resolve_field(ast_nodes, @parent_type, field_definition, authorized_objects, dir_args, ctx)
          if !result.nil?
            if result.is_a?(Finalizer)
              result.path = path
              @directive_finalizers ||= []
              @directive_finalizers << result
            end

            if result.is_a?(PostProcessor)
              @post_processors ||= []
              @post_processors << result
            end

            if result.is_a?(HaltExecution)
              @directive_finalizers&.each { |f|
                @selections_step.results.each { |r|  @runner.add_finalizer(query, r, key, f) }
              }
              return
            end
          end
        end
      end
    end
  end

  has_extensions = @field_definition.extensions.size > 0
  if has_extensions
    @extended = GraphQL::Schema::Field::ExtendedState.new(@arguments, authorized_objects)
    @field_results = @field_definition.run_next_extensions_before_resolve(authorized_objects, @arguments, ctx, @extended) do |objs, args|
      if (added_extras = @extended.added_extras)
        args = args.dup
        added_extras.each { |e| args.delete(e) }
      end
      resolve_batch(objs, ctx, args)
    end
    @finish_extension_idx = 0
  else
    @field_results = resolve_batch(authorized_objects, ctx, @arguments)
  end

  query.current_trace.end_execute_field(@field_definition, @arguments, authorized_objects, query, @field_results)

  if any_lazy_results?
    @runner.dataloader.lazy_at_depth(path.size, self)
  elsif has_extensions
    finish_extensions
  elsif @pending_steps.nil? || @pending_steps.empty?
    build_results
  end
end

#finish_extensions ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 299

def finish_extensions
  ctx = @selections_step.query.context
  memos = @extended.memos || EmptyObjects::EMPTY_HASH
  while ext = @field_definition.extensions[@finish_extension_idx]
    # These two are hardcoded here because of how they need to interact with runtime metadata.
    # It would probably be better
    case ext
    when Schema::Field::ConnectionExtension
      conns = ctx.schema.connections
      @field_results.map!.each_with_index do |value, idx|
        object = @extended.object[idx]
        conn = conns.populate_connection(@field_definition, object, value, @arguments, ctx)
        if conn
          conn.was_authorized_by_scope_items = @was_scoped
        end
        conn
      end
    when Schema::Field::ScopeExtension
      if @was_scoped.nil?
        if (rt = @field_definition.type.unwrap).respond_to?(:scope_items)
          @was_scoped = true
          @field_results.map! { |v| v.nil? ? v : rt.scope_items(v, ctx) }
        else
          @was_scoped = false
        end
      end
    else
      memo = memos[@finish_extension_idx]
      @field_results = ext.after_resolve(objects: @extended.object, arguments: @extended.arguments, context: ctx, values: @field_results, memo: memo) # rubocop:disable Development/ContextIsPassedCop
    end
    @finish_extension_idx += 1
    if any_lazy_results?
      @runner.dataloader.lazy_at_depth(path.size, self)
      return
    end
  end

  @finish_extension_idx = nil
  build_results
end

#finish_leaf_result(result_h, key, field_result, return_type, ctx) ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 392

def finish_leaf_result(result_h, key, field_result, return_type, ctx)
  final_field_result = if field_result.nil?
    if return_type.non_null?
      add_non_null_error(false)
    else
      nil
    end
  elsif field_result.is_a?(Finalizer)
    if field_result.is_a?(GraphQL::RuntimeError)
      add_graphql_error(field_result)
    else
      field_result.path = path
      @runner.add_finalizer(ctx.query, result_h, key, field_result)
    end
  else
    # TODO `nil`s in [T!] types aren't handled
    return_type.coerce_result(field_result, ctx)
  end

  @directive_finalizers&.each { |f| @runner.add_finalizer(ctx.query, result_h, key, f) }
  result_h[@key] = final_field_result
end

#path ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 32

def path
  @path ||= [*@selections_step.path, @key].freeze
end

#sync(lazy) ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 60

def sync(lazy)
  if lazy.is_a?(Array)
    lazy.map! { |l| sync(l)}
  else
    @runner.schema.sync_lazy(lazy)
  end
rescue GraphQL::UnauthorizedError => auth_err
  @runner.schema.unauthorized_object(auth_err)
rescue GraphQL::ExecutionError => err
  err
rescue StandardError => stderr
  begin
    @selections_step.query.handle_or_reraise(stderr)
  rescue GraphQL::ExecutionError => ex_err
    ex_err
  end
end

#value ⇒ Object 



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# File 'lib/graphql/execution/field_resolve_step.rb', line 51

def value
  query = @selections_step.query
  query.current_trace.begin_execute_field(@field_definition, @arguments, @field_results, query)
  sync(@field_results)
  query.current_trace.end_execute_field(@field_definition, @arguments, @field_results, query, @field_results)
  @runner.add_step(self)
  true
end