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.

Constant Summary collapse

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:, response:) ⇒ 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 20

def initialize(query:, response:)
  @query = query
  @schema = query.schema
  @context = query.context
  @interpreter_context = @context.namespace(:interpreter)
  @response = response
  @dead_paths = {}
  @types_at_paths = {}
  # 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] = {} }
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 18

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 12

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 15

def schema
  @schema
end

Instance Method Details

#add_dead_path(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.

Mark path as having been permanently nulled out. No values will be added beyond that path.



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 524

def add_dead_path(path)
  dead = @dead_paths
  path.each do |part|
    dead = dead[part] ||= {}
  end
  dead[:__dead] = true
end

#after_lazy(lazy_obj, owner:, field:, path:, scoped_context:, owner_object:, arguments:, 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

  • path (Array<String>)
  • 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 420

def after_lazy(lazy_obj, owner:, field:, path:, scoped_context:, owner_object:, arguments:, eager: false, trace: true, &block)
  @interpreter_context[:current_object] = owner_object
  @interpreter_context[:current_arguments] = arguments
  @interpreter_context[:current_path] = path
  @interpreter_context[:current_field] = field
  if schema.lazy?(lazy_obj)
    lazy = GraphQL::Execution::Lazy.new(path: path, field: field) do
      @interpreter_context[:current_path] = path
      @interpreter_context[:current_field] = field
      @interpreter_context[:current_object] = owner_object
      @interpreter_context[:current_arguments] = arguments
      context.scoped_context = scoped_context
      # Wrap the execution of _this_ method with tracing,
      # but don't wrap the continuation below
      inner_obj = begin
        query.with_error_handling do
          if trace
            query.trace("execute_field_lazy", {owner: owner, field: field, path: path, query: query, object: owner_object, arguments: arguments}) do
              schema.sync_lazy(lazy_obj)
            end
          else
            schema.sync_lazy(lazy_obj)
          end
        end
        rescue GraphQL::ExecutionError, GraphQL::UnauthorizedError => err
          err
      end
      after_lazy(inner_obj, owner: owner, field: field, path: path, scoped_context: context.scoped_context, owner_object: owner_object, arguments: arguments, eager: eager, trace: trace, &block)
    end

    if eager
      lazy.value
    else
      write_in_response(path, lazy)
      lazy
    end
  else
    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 461

def arguments(graphql_object, arg_owner, ast_node)
  query.arguments_for(ast_node, arg_owner, parent_object: graphql_object)
end

#authorized_new(type, value, context, 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 563

def authorized_new(type, value, context, path)
  trace_payload = { context: context, type: type, object: value, path: path }

  auth_val = context.query.trace("authorized", trace_payload) do
    type.authorized_new(value, context)
  end

  if context.schema.lazy?(auth_val)
    GraphQL::Execution::Lazy.new do
      context.query.trace("authorized_lazy", trace_payload) do
        context.schema.sync_lazy(auth_val)
      end
    end
  else
    auth_val
  end
end

#continue_field(path, value, field, type, ast_node, next_selections, is_non_null, owner_object, arguments) ⇒ 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 302

def continue_field(path, value, field, type, ast_node, next_selections, is_non_null, owner_object, arguments) # rubocop:disable Metrics/ParameterLists
  case type.kind.name
  when "SCALAR", "ENUM"
    r = type.coerce_result(value, context)
    write_in_response(path, r)
    r
  when "UNION", "INTERFACE"
    resolved_type_or_lazy = resolve_type(type, value, path)
    after_lazy(resolved_type_or_lazy, owner: type, path: path, scoped_context: context.scoped_context, field: field, owner_object: owner_object, arguments: arguments, trace: false) do |resolved_type|
      possible_types = query.possible_types(type)

      if !possible_types.include?(resolved_type)
        parent_type = field.owner
        type_error = GraphQL::UnresolvedTypeError.new(value, field, parent_type, resolved_type, possible_types)
        schema.type_error(type_error, context)
        write_in_response(path, nil)
        nil
      else
        continue_field(path, value, field, resolved_type, ast_node, next_selections, is_non_null, owner_object, arguments)
      end
    end
  when "OBJECT"
    object_proxy = begin
      authorized_new(type, value, context, path)
    rescue GraphQL::ExecutionError => err
      err
    end
    after_lazy(object_proxy, owner: type, path: path, scoped_context: context.scoped_context, field: field, owner_object: owner_object, arguments: arguments, trace: false) do |inner_object|
      continue_value = continue_value(path, inner_object, field, is_non_null, ast_node)
      if HALT != continue_value
        response_hash = {}
        write_in_response(path, response_hash)
        evaluate_selections(path, context.scoped_context, continue_value, type, next_selections)
        response_hash
      end
    end
  when "LIST"
    response_list = []
    write_in_response(path, response_list)
    inner_type = type.of_type
    idx = 0
    scoped_context = context.scoped_context
    begin
      value.each do |inner_value|
        next_path = path.dup
        next_path << idx
        next_path.freeze
        idx += 1
        set_type_at_path(next_path, inner_type)
        # This will update `response_list` with the lazy
        after_lazy(inner_value, owner: inner_type, path: next_path, scoped_context: scoped_context, field: field, owner_object: owner_object, arguments: arguments) do |inner_inner_value|
          continue_value = continue_value(next_path, inner_inner_value, field, inner_type.non_null?, ast_node)
          if HALT != continue_value
            continue_field(next_path, continue_value, field, inner_type, ast_node, next_selections, false, owner_object, arguments)
          end
        end
      end
    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: path)
      else
        # This was some other NoMethodError -- let it bubble to reveal the real error.
        raise
      end
    end

    response_list
  when "NON_NULL"
    inner_type = type.of_type
    # Don't `set_type_at_path` because we want the static type,
    # we're going to use that to determine whether a `nil` should be propagated or not.
    continue_field(path, value, field, inner_type, ast_node, next_selections, true, owner_object, arguments)
  else
    raise "Invariant: Unhandled type kind #{type.kind} (#{type})"
  end
end

#continue_value(path, value, field, is_non_null, 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 256

def continue_value(path, value, field, is_non_null, ast_node)
  if value.nil?
    if is_non_null
      err = GraphQL::InvalidNullError.new(field.owner, field, value)
      write_invalid_null_in_response(path, err)
    else
      write_in_response(path, nil)
    end
    HALT
  elsif value.is_a?(GraphQL::ExecutionError)
    value.path ||= path
    value.ast_node ||= ast_node
    write_execution_errors_in_response(path, [value])
    HALT
  elsif value.is_a?(Array) && value.any? && value.all? { |v| v.is_a?(GraphQL::ExecutionError) }
    value.each_with_index do |error, index|
      error.ast_node ||= ast_node
      error.path ||= path + (field.type.list? ? [index] : [])
    end
    write_execution_errors_in_response(path, value)
    HALT
  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(path, next_value, field, is_non_null, ast_node)
  elsif GraphQL::Execution::Execute::SKIP == value
    HALT
  else
    value
  end
end

#dead_path?(path) ⇒ 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 532

def dead_path?(path)
  res = @dead_paths
  path.each do |part|
    if res
      if res[:__dead]
        break
      else
        res = res[part]
      end
    end
  end
  res && res[:__dead]
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 403

def directives_include?(node, graphql_object, parent_type)
  node.directives.each do |dir_node|
    dir_defn = schema.directives.fetch(dir_node.name).type_class || raise("Only class-based directives are supported (not #{dir_node.name.inspect})")
    args = arguments(graphql_object, dir_defn, dir_node).keyword_arguments
    if !dir_defn.include?(graphql_object, args, context)
      return false
    end
  end
  true
end

#evaluate_selections(path, scoped_context, owner_object, owner_type, selections, root_operation_type: nil) ⇒ 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 119

def evaluate_selections(path, scoped_context, owner_object, owner_type, selections, root_operation_type: nil)
  @interpreter_context[:current_object] = owner_object
  @interpreter_context[:current_path] = path
  selections_by_name = {}
  gather_selections(owner_object, owner_type, selections, selections_by_name)
  selections_by_name.each do |result_name, field_ast_nodes_or_ast_node|
    # 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
    field_defn = @fields_cache[owner_type][field_name] ||= owner_type.get_field(field_name)
    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

    next_path = path.dup
    next_path << result_name
    next_path.freeze

    # This seems janky, but we need to know
    # the field's return type at this path in order
    # to propagate `null`
    set_type_at_path(next_path, return_type)
    # Set this before calling `run_with_directives`, so that the directive can have the latest path
    @interpreter_context[:current_path] = next_path
    @interpreter_context[:current_field] = field_defn

    context.scoped_context = scoped_context
    object = owner_object

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

    begin
      kwarg_arguments = arguments(object, field_defn, ast_node)
    rescue GraphQL::ExecutionError => e
      continue_value(next_path, e, field_defn, return_type.non_null?, ast_node)
      next
    end

    after_lazy(kwarg_arguments, owner: owner_type, field: field_defn, path: next_path, scoped_context: context.scoped_context, owner_object: object, arguments: kwarg_arguments) do |resolved_arguments|
      if resolved_arguments.is_a? GraphQL::ExecutionError
        continue_value(next_path, resolved_arguments, field_defn, return_type.non_null?, ast_node)
        next
      end

      kwarg_arguments = resolved_arguments.keyword_arguments

      # It might turn out that making arguments for every field is slow.
      # If we have to cache them, we'll need a more subtle approach here.
      field_defn.extras.each do |extra|
        case extra
        when :ast_node
          kwarg_arguments[:ast_node] = ast_node
        when :execution_errors
          kwarg_arguments[:execution_errors] = ExecutionErrors.new(context, ast_node, next_path)
        when :path
          kwarg_arguments[:path] = next_path
        when :lookahead
          if !field_ast_nodes
            field_ast_nodes = [ast_node]
          end
          kwarg_arguments[:lookahead] = Execution::Lookahead.new(
            query: query,
            ast_nodes: field_ast_nodes,
            field: field_defn,
          )
        when :argument_details
          kwarg_arguments[:argument_details] = resolved_arguments
        else
          kwarg_arguments[extra] = field_defn.fetch_extra(extra, context)
        end
      end

      @interpreter_context[:current_arguments] = kwarg_arguments

      # 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
      else
        next_selections = []
        field_ast_nodes.each { |f| next_selections.concat(f.selections) }
      end

      field_result = resolve_with_directives(object, ast_node) do
        # Actually call the field resolver and capture the result
        app_result = begin
          query.with_error_handling do
            query.trace("execute_field", {owner: owner_type, field: field_defn, path: next_path, query: query, object: object, arguments: kwarg_arguments}) do
              field_defn.resolve(object, kwarg_arguments, context)
            end
          end
        rescue GraphQL::ExecutionError => err
          err
        end
        after_lazy(app_result, owner: owner_type, field: field_defn, path: next_path, scoped_context: context.scoped_context, owner_object: object, arguments: kwarg_arguments) do |inner_result|
          continue_value = continue_value(next_path, inner_result, field_defn, return_type.non_null?, ast_node)
          if RawValue === continue_value
            # Write raw value directly to the response without resolving nested objects
            write_in_response(next_path, continue_value.resolve)
          elsif HALT != continue_value
            continue_field(next_path, continue_value, field_defn, return_type, ast_node, next_selections, false, object, kwarg_arguments)
          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 root_operation_type == "mutation"
        Interpreter::Resolve.resolve_all([field_result])
      else
        field_result
      end
    end
  end
end

#final_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 34

def final_value
  @response.final_value
end

#gather_selections(owner_object, owner_type, selections, 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 65

def gather_selections(owner_object, owner_type, selections, 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

    case node
    when 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
    when GraphQL::Language::Nodes::InlineFragment
      if node.type
        type_defn = schema.get_type(node.type.name)
        # 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_by_name)
            break
          end
        end
      else
        # it's an untyped fragment, definitely continue
        gather_selections(owner_object, owner_type, node.selections, selections_by_name)
      end
    when GraphQL::Language::Nodes::FragmentSpread
      fragment_def = query.fragments[node.name]
      type_defn = schema.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_by_name)
          break
        end
      end
    else
      raise "Invariant: unexpected selection class: #{node.class}"
    end
  end
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 38

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

#resolve_type(type, value, 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 546

def resolve_type(type, value, path)
  trace_payload = { context: context, type: type, object: value, path: path }
  resolved_type = query.trace("resolve_type", trace_payload) do
    query.resolve_type(type, value)
  end

  if schema.lazy?(resolved_type)
    GraphQL::Execution::Lazy.new do
      query.trace("resolve_type_lazy", trace_payload) do
        schema.sync_lazy(resolved_type)
      end
    end
  else
    resolved_type
  end
end

#resolve_with_directives(object, ast_node, &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 381

def resolve_with_directives(object, ast_node, &block)
  return yield if ast_node.directives.empty?
  run_directive(object, ast_node, 0, &block)
end

#run_directive(object, ast_node, 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 386

def run_directive(object, ast_node, idx, &block)
  dir_node = ast_node.directives[idx]
  if !dir_node
    yield
  else
    dir_defn = schema.directives.fetch(dir_node.name)
    if !dir_defn.is_a?(Class)
      dir_defn = dir_defn.type_class || raise("Only class-based directives are supported (not `@#{dir_node.name}`)")
    end
    dir_args = arguments(nil, dir_defn, dir_node).keyword_arguments
    dir_defn.resolve(object, dir_args, context) do
      run_directive(object, ast_node, idx + 1, &block)
    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 45

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)
  path = []
  @interpreter_context[:current_object] = query.root_value
  @interpreter_context[:current_path] = path
  object_proxy = authorized_new(root_type, query.root_value, context, path)
  object_proxy = schema.sync_lazy(object_proxy)
  if object_proxy.nil?
    # Root .authorized? returned false.
    write_in_response(path, nil)
    nil
  else
    evaluate_selections(path, context.scoped_context, object_proxy, root_type, root_operation.selections, root_operation_type: root_op_type)
    nil
  end
end

#set_type_at_path(path, 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. 



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 510

def set_type_at_path(path, type)
  types = @types_at_paths
  path.each do |part|
    types = types[part] ||= {}
  end
  # Use this magic key so that the hash contains:
  # - string keys for nested fields
  # - :__type for the object type of a selection
  types[:__type] ||= type
  nil
end

#type_at(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.

To propagate nulls, we have to know what the field type was at previous parts of the response. This hash matches the response



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# File 'lib/graphql/execution/interpreter/runtime.rb', line 501

def type_at(path)
  t = @types_at_paths
  path.each do |part|
    t = t[part] || (raise("Invariant: #{part.inspect} not found in #{t}"))
  end
  t = t[:__type]
  t
end

#write_execution_errors_in_response(path, errors) ⇒ 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 473

def write_execution_errors_in_response(path, errors)
  if !dead_path?(path)
    errors.each do |v|
      context.errors << v
    end
    write_in_response(path, nil)
    add_dead_path(path)
  end
end

#write_in_response(path, 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 483

def write_in_response(path, value)
  if dead_path?(path)
    return
  else
    if value.nil? && path.any? && type_at(path).non_null?
      # This nil is invalid, try writing it at the previous spot
      propagate_path = path[0..-2]
      write_in_response(propagate_path, value)
      add_dead_path(propagate_path)
    else
      @response.write(path, value)
    end
  end
end

#write_invalid_null_in_response(path, invalid_null_error) ⇒ 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 465

def write_invalid_null_in_response(path, invalid_null_error)
  if !dead_path?(path)
    schema.type_error(invalid_null_error, context)
    write_in_response(path, nil)
    add_dead_path(path)
  end
end