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composer.rb
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composer.rb
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# frozen_string_literal: true
require_relative "./composer/base_validator"
require_relative "./composer/validate_interfaces"
require_relative "./composer/validate_resolvers"
require_relative "./composer/resolver_config"
module GraphQL
module Stitching
class Composer
class ComposerError < StitchingError; end
class ValidationError < ComposerError; end
# @api private
NO_DEFAULT_VALUE = begin
class T < GraphQL::Schema::Object
field(:f, String) do
argument(:a, String)
end
end
T.get_field("f").get_argument("a").default_value
end
# @api private
BASIC_VALUE_MERGER = ->(values_by_location, _info) { values_by_location.values.find { !_1.nil? } }
# @api private
BASIC_ROOT_FIELD_LOCATION_SELECTOR = ->(locations, _info) { locations.last }
# @api private
VALIDATORS = [
"ValidateInterfaces",
"ValidateResolvers",
].freeze
# @return [String] name of the Query type in the composed schema.
attr_reader :query_name
# @return [String] name of the Mutation type in the composed schema.
attr_reader :mutation_name
# @api private
attr_reader :candidate_types_by_name_and_location
# @api private
attr_reader :schema_directives
def initialize(
query_name: "Query",
mutation_name: "Mutation",
description_merger: nil,
deprecation_merger: nil,
default_value_merger: nil,
directive_kwarg_merger: nil,
root_field_location_selector: nil
)
@query_name = query_name
@mutation_name = mutation_name
@description_merger = description_merger || BASIC_VALUE_MERGER
@deprecation_merger = deprecation_merger || BASIC_VALUE_MERGER
@default_value_merger = default_value_merger || BASIC_VALUE_MERGER
@directive_kwarg_merger = directive_kwarg_merger || BASIC_VALUE_MERGER
@root_field_location_selector = root_field_location_selector || BASIC_ROOT_FIELD_LOCATION_SELECTOR
@resolver_configs = {}
@field_map = nil
@resolver_map = nil
@mapped_type_names = nil
@candidate_directives_by_name_and_location = nil
@candidate_types_by_name_and_location = nil
@schema_directives = nil
end
def perform(locations_input)
reset!
schemas, executables = prepare_locations_input(locations_input)
# "directive_name" => "location" => candidate_directive
@candidate_directives_by_name_and_location = schemas.each_with_object({}) do |(location, schema), memo|
(schema.directives.keys - schema.default_directives.keys - GraphQL::Stitching.stitching_directive_names).each do |directive_name|
memo[directive_name] ||= {}
memo[directive_name][location] = schema.directives[directive_name]
end
end
# "directive_name" => merged_directive
@schema_directives = @candidate_directives_by_name_and_location.each_with_object({}) do |(directive_name, directives_by_location), memo|
memo[directive_name] = build_directive(directive_name, directives_by_location)
end
@schema_directives.merge!(GraphQL::Schema.default_directives)
# "Typename" => "location" => candidate_type
@candidate_types_by_name_and_location = schemas.each_with_object({}) do |(location, schema), memo|
raise ComposerError, "Location keys must be strings" unless location.is_a?(String)
raise ComposerError, "The subscription operation is not supported." if schema.subscription
introspection_types = schema.introspection_system.types.keys
schema.types.each do |type_name, type_candidate|
next if introspection_types.include?(type_name)
if type_name == @query_name && type_candidate != schema.query
raise ComposerError, "Query name \"#{@query_name}\" is used by non-query type in #{location} schema."
elsif type_name == @mutation_name && type_candidate != schema.mutation
raise ComposerError, "Mutation name \"#{@mutation_name}\" is used by non-mutation type in #{location} schema."
end
type_name = @query_name if type_candidate == schema.query
type_name = @mutation_name if type_candidate == schema.mutation
@mapped_type_names[type_candidate.graphql_name] = type_name if type_candidate.graphql_name != type_name
memo[type_name] ||= {}
memo[type_name][location] = type_candidate
end
end
enum_usage = build_enum_usage_map(schemas.values)
# "Typename" => merged_type
schema_types = @candidate_types_by_name_and_location.each_with_object({}) do |(type_name, types_by_location), memo|
kinds = types_by_location.values.map { _1.kind.name }.tap(&:uniq!)
if kinds.length > 1
raise ComposerError, "Cannot merge different kinds for `#{type_name}`. Found: #{kinds.join(", ")}."
end
extract_resolvers(type_name, types_by_location) if type_name == @query_name
memo[type_name] = case kinds.first
when "SCALAR"
build_scalar_type(type_name, types_by_location)
when "ENUM"
build_enum_type(type_name, types_by_location, enum_usage)
when "OBJECT"
build_object_type(type_name, types_by_location)
when "INTERFACE"
build_interface_type(type_name, types_by_location)
when "UNION"
build_union_type(type_name, types_by_location)
when "INPUT_OBJECT"
build_input_object_type(type_name, types_by_location)
else
raise ComposerError, "Unexpected kind encountered for `#{type_name}`. Found: #{kinds.first}."
end
end
builder = self
schema = Class.new(GraphQL::Schema) do
add_type_and_traverse(schema_types.values, root: false)
orphan_types(schema_types.values.select { |t| t.respond_to?(:kind) && t.kind.object? })
query schema_types[builder.query_name]
mutation schema_types[builder.mutation_name]
directives builder.schema_directives.values
own_orphan_types.clear
end
select_root_field_locations(schema)
expand_abstract_resolvers(schema)
supergraph = Supergraph.new(
schema: schema,
fields: @field_map,
resolvers: @resolver_map,
executables: executables,
)
VALIDATORS.each do |validator|
klass = Object.const_get("GraphQL::Stitching::Composer::#{validator}")
klass.new.perform(supergraph, self)
end
supergraph
end
# @!scope class
# @!visibility private
def prepare_locations_input(locations_input)
schemas = {}
executables = {}
locations_input.each do |location, input|
schema = input[:schema]
if schema.nil?
raise ComposerError, "A schema is required for `#{location}` location."
elsif !(schema.is_a?(Class) && schema <= GraphQL::Schema)
raise ComposerError, "The schema for `#{location}` location must be a GraphQL::Schema class."
end
@resolver_configs.merge!(ResolverConfig.extract_directive_assignments(schema, location, input[:stitch]))
@resolver_configs.merge!(ResolverConfig.extract_federation_entities(schema, location))
schemas[location.to_s] = schema
executables[location.to_s] = input[:executable] || schema
end
return schemas, executables
end
# @!scope class
# @!visibility private
def build_directive(directive_name, directives_by_location)
builder = self
Class.new(GraphQL::Schema::Directive) do
graphql_name(directive_name)
description(builder.merge_descriptions(directive_name, directives_by_location))
repeatable(directives_by_location.values.any?(&:repeatable?))
locations(*directives_by_location.values.flat_map(&:locations).tap(&:uniq!))
builder.build_merged_arguments(directive_name, directives_by_location, self, directive_name: directive_name)
end
end
# @!scope class
# @!visibility private
def build_scalar_type(type_name, types_by_location)
built_in_type = GraphQL::Schema::BUILT_IN_TYPES[type_name]
return built_in_type if built_in_type
builder = self
Class.new(GraphQL::Schema::Scalar) do
graphql_name(type_name)
description(builder.merge_descriptions(type_name, types_by_location))
builder.build_merged_directives(type_name, types_by_location, self)
end
end
# @!scope class
# @!visibility private
def build_enum_type(type_name, types_by_location, enum_usage)
builder = self
# "value" => "location" => enum_value
enum_values_by_name_location = types_by_location.each_with_object({}) do |(location, type_candidate), memo|
type_candidate.enum_values.each do |enum_value_candidate|
memo[enum_value_candidate.graphql_name] ||= {}
memo[enum_value_candidate.graphql_name][location] = enum_value_candidate
end
end
# intersect input enum types
if enum_usage.fetch(type_name, EMPTY_ARRAY).include?(:write)
enum_values_by_name_location.reject! do |value, enum_values_by_location|
types_by_location.keys.length != enum_values_by_location.keys.length
end
end
Class.new(GraphQL::Schema::Enum) do
graphql_name(type_name)
description(builder.merge_descriptions(type_name, types_by_location))
builder.build_merged_directives(type_name, types_by_location, self)
enum_values_by_name_location.each do |value_name, enum_values_by_location|
enum_value = value(value_name,
value: value_name,
description: builder.merge_descriptions(type_name, enum_values_by_location, enum_value: value_name),
deprecation_reason: builder.merge_deprecations(type_name, enum_values_by_location, enum_value: value_name),
)
builder.build_merged_directives(type_name, enum_values_by_location, enum_value, enum_value: value_name)
end
end
end
# @!scope class
# @!visibility private
def build_object_type(type_name, types_by_location)
builder = self
Class.new(GraphQL::Schema::Object) do
graphql_name(type_name)
description(builder.merge_descriptions(type_name, types_by_location))
interface_names = types_by_location.values.flat_map { _1.interfaces.map(&:graphql_name) }
interface_names.tap(&:uniq!).each do |interface_name|
implements(builder.build_type_binding(interface_name))
end
builder.build_merged_fields(type_name, types_by_location, self)
builder.build_merged_directives(type_name, types_by_location, self)
end
end
# @!scope class
# @!visibility private
def build_interface_type(type_name, types_by_location)
builder = self
Module.new do
include GraphQL::Schema::Interface
graphql_name(type_name)
description(builder.merge_descriptions(type_name, types_by_location))
interface_names = types_by_location.values.flat_map { _1.interfaces.map(&:graphql_name) }
interface_names.tap(&:uniq!).each do |interface_name|
implements(builder.build_type_binding(interface_name))
end
builder.build_merged_fields(type_name, types_by_location, self)
builder.build_merged_directives(type_name, types_by_location, self)
end
end
# @!scope class
# @!visibility private
def build_union_type(type_name, types_by_location)
builder = self
Class.new(GraphQL::Schema::Union) do
graphql_name(type_name)
description(builder.merge_descriptions(type_name, types_by_location))
possible_names = types_by_location.values.flat_map { _1.possible_types.map(&:graphql_name) }.tap(&:uniq!)
possible_types(*possible_names.map { builder.build_type_binding(_1) })
builder.build_merged_directives(type_name, types_by_location, self)
end
end
# @!scope class
# @!visibility private
def build_input_object_type(type_name, types_by_location)
builder = self
Class.new(GraphQL::Schema::InputObject) do
graphql_name(type_name)
description(builder.merge_descriptions(type_name, types_by_location))
builder.build_merged_arguments(type_name, types_by_location, self)
builder.build_merged_directives(type_name, types_by_location, self)
end
end
# @!scope class
# @!visibility private
def build_type_binding(type_name)
GraphQL::Schema::LateBoundType.new(@mapped_type_names.fetch(type_name, type_name))
end
# @!scope class
# @!visibility private
def build_merged_fields(type_name, types_by_location, owner)
# "field_name" => "location" => field
fields_by_name_location = types_by_location.each_with_object({}) do |(location, type_candidate), memo|
@field_map[type_name] ||= {}
type_candidate.fields.each do |field_name, field_candidate|
@field_map[type_name][field_candidate.name] ||= []
@field_map[type_name][field_candidate.name] << location
memo[field_name] ||= {}
memo[field_name][location] = field_candidate
end
end
fields_by_name_location.each do |field_name, fields_by_location|
value_types = fields_by_location.values.map(&:type)
type = merge_value_types(type_name, value_types, field_name: field_name)
schema_field = owner.field(
field_name,
description: merge_descriptions(type_name, fields_by_location, field_name: field_name),
deprecation_reason: merge_deprecations(type_name, fields_by_location, field_name: field_name),
type: Util.unwrap_non_null(type),
null: !type.non_null?,
camelize: false,
)
build_merged_arguments(type_name, fields_by_location, schema_field, field_name: field_name)
build_merged_directives(type_name, fields_by_location, schema_field, field_name: field_name)
end
end
# @!scope class
# @!visibility private
def build_merged_arguments(type_name, members_by_location, owner, field_name: nil, directive_name: nil)
# "argument_name" => "location" => argument
args_by_name_location = members_by_location.each_with_object({}) do |(location, member_candidate), memo|
member_candidate.arguments.each do |argument_name, argument|
memo[argument_name] ||= {}
memo[argument_name][location] = argument
end
end
args_by_name_location.each do |argument_name, arguments_by_location|
value_types = arguments_by_location.values.map(&:type)
if arguments_by_location.length != members_by_location.length
if value_types.any?(&:non_null?)
path = [type_name, field_name, argument_name].compact.join(".")
raise ComposerError, "Required argument `#{path}` must be defined in all locations." # ...or hidden?
end
next
end
# Getting double args sometimes on auto-generated connection types... why?
next if owner.arguments.any? { _1.first == argument_name }
kwargs = {}
default_values_by_location = arguments_by_location.each_with_object({}) do |(location, argument), memo|
next if argument.default_value == NO_DEFAULT_VALUE
memo[location] = argument.default_value
end
if default_values_by_location.any?
kwargs[:default_value] = @default_value_merger.call(default_values_by_location, {
type_name: type_name,
field_name: field_name,
argument_name: argument_name,
directive_name: directive_name,
}.tap(&:compact!))
end
type = merge_value_types(type_name, value_types, argument_name: argument_name, field_name: field_name)
schema_argument = owner.argument(
argument_name,
description: merge_descriptions(type_name, arguments_by_location, argument_name: argument_name, field_name: field_name),
deprecation_reason: merge_deprecations(type_name, arguments_by_location, argument_name: argument_name, field_name: field_name),
type: Util.unwrap_non_null(type),
required: type.non_null?,
camelize: false,
**kwargs,
)
build_merged_directives(type_name, arguments_by_location, schema_argument, field_name: field_name, argument_name: argument_name)
end
end
# @!scope class
# @!visibility private
def build_merged_directives(type_name, members_by_location, owner, field_name: nil, argument_name: nil, enum_value: nil)
directives_by_name_location = members_by_location.each_with_object({}) do |(location, member_candidate), memo|
member_candidate.directives.each do |directive|
memo[directive.graphql_name] ||= {}
memo[directive.graphql_name][location] = directive
end
end
directives_by_name_location.each do |directive_name, directives_by_location|
directive_class = @schema_directives[directive_name]
next unless directive_class
# handled by deprecation_reason merger...
next if directive_class.graphql_name == "deprecated"
kwarg_values_by_name_location = directives_by_location.each_with_object({}) do |(location, directive), memo|
directive.arguments.keyword_arguments.each do |key, value|
key = key.to_s
next unless directive_class.arguments[key]
memo[key] ||= {}
memo[key][location] = value
end
end
kwargs = kwarg_values_by_name_location.each_with_object({}) do |(kwarg_name, kwarg_values_by_location), memo|
memo[kwarg_name.to_sym] = @directive_kwarg_merger.call(kwarg_values_by_location, {
type_name: type_name,
field_name: field_name,
argument_name: argument_name,
enum_value: enum_value,
directive_name: directive_name,
kwarg_name: kwarg_name,
}.tap(&:compact!))
end
owner.directive(directive_class, **kwargs)
end
end
# @!scope class
# @!visibility private
def merge_value_types(type_name, type_candidates, field_name: nil, argument_name: nil)
path = [type_name, field_name, argument_name].tap(&:compact!).join(".")
alt_structures = type_candidates.map { Util.flatten_type_structure(_1) }
basis_structure = alt_structures.shift
alt_structures.each do |alt_structure|
if alt_structure.length != basis_structure.length
raise ComposerError, "Cannot compose mixed list structures at `#{path}`."
end
if alt_structure.last.name != basis_structure.last.name
raise ComposerError, "Cannot compose mixed types at `#{path}`."
end
end
type = GraphQL::Schema::BUILT_IN_TYPES.fetch(
basis_structure.last.name,
build_type_binding(basis_structure.last.name)
)
basis_structure.reverse!.each_with_index do |basis, index|
rev_index = basis_structure.length - index - 1
non_null = alt_structures.each_with_object([basis.non_null?]) { |s, m| m << s[rev_index].non_null? }
type = type.to_list_type if basis.list?
type = type.to_non_null_type if argument_name ? non_null.any? : non_null.all?
end
type
end
# @!scope class
# @!visibility private
def merge_descriptions(type_name, members_by_location, field_name: nil, argument_name: nil, enum_value: nil)
strings_by_location = members_by_location.each_with_object({}) { |(l, m), memo| memo[l] = m.description }
@description_merger.call(strings_by_location, {
type_name: type_name,
field_name: field_name,
argument_name: argument_name,
enum_value: enum_value,
}.tap(&:compact!))
end
# @!scope class
# @!visibility private
def merge_deprecations(type_name, members_by_location, field_name: nil, argument_name: nil, enum_value: nil)
strings_by_location = members_by_location.each_with_object({}) { |(l, m), memo| memo[l] = m.deprecation_reason }
@deprecation_merger.call(strings_by_location, {
type_name: type_name,
field_name: field_name,
argument_name: argument_name,
enum_value: enum_value,
}.tap(&:compact!))
end
# @!scope class
# @!visibility private
def extract_resolvers(type_name, types_by_location)
types_by_location.each do |location, type_candidate|
type_candidate.fields.each do |field_name, field_candidate|
resolver_type = field_candidate.type.unwrap
resolver_structure = Util.flatten_type_structure(field_candidate.type)
resolver_configs = @resolver_configs.fetch("#{location}.#{field_name}", [])
field_candidate.directives.each do |directive|
next unless directive.graphql_name == GraphQL::Stitching.stitch_directive
resolver_configs << ResolverConfig.from_kwargs(directive.arguments.keyword_arguments)
end
resolver_configs.each do |config|
key_selections = GraphQL.parse("{ #{config.key} }").definitions[0].selections
if key_selections.length != 1
raise ComposerError, "Resolver key at #{type_name}.#{field_name} must specify exactly one key."
end
argument = field_candidate.arguments[key_selections[0].alias]
argument ||= if field_candidate.arguments.size == 1
field_candidate.arguments.values.first
else
field_candidate.arguments[config.key]
end
unless argument
raise ComposerError, "No resolver argument matched for #{type_name}.#{field_name}. " \
"Add an alias to the key that specifies its intended argument, ex: `arg:key`"
end
argument_structure = Util.flatten_type_structure(argument.type)
if argument_structure.length != resolver_structure.length
raise ComposerError, "Mismatched input/output for #{type_name}.#{field_name}.#{argument.graphql_name} resolver. " \
"Arguments must map directly to results."
end
resolver_type_name = if config.type_name
if !resolver_type.kind.abstract?
raise ComposerError, "Resolver config may only specify a type name for abstract resolvers."
elsif !resolver_type.possible_types.find { _1.graphql_name == config.type_name }
raise ComposerError, "Type `#{config.type_name}` is not a possible return type for query `#{field_name}`."
end
config.type_name
else
resolver_type.graphql_name
end
@resolver_map[resolver_type_name] ||= []
@resolver_map[resolver_type_name] << Resolver.new(
location: location,
type_name: resolver_type_name,
key: key_selections[0].name,
field: field_candidate.name,
arg: argument.graphql_name,
arg_type_name: argument.type.unwrap.graphql_name,
list: resolver_structure.first.list?,
representations: config.representations,
)
end
end
end
end
# @!scope class
# @!visibility private
def select_root_field_locations(schema)
[schema.query, schema.mutation].tap(&:compact!).each do |root_type|
root_type.fields.each do |root_field_name, root_field|
root_field_locations = @field_map[root_type.graphql_name][root_field_name]
next unless root_field_locations.length > 1
target_location = @root_field_location_selector.call(root_field_locations, {
type_name: root_type.graphql_name,
field_name: root_field_name,
})
next unless root_field_locations.include?(target_location)
root_field_locations.reject! { _1 == target_location }
root_field_locations.unshift(target_location)
end
end
end
# @!scope class
# @!visibility private
def expand_abstract_resolvers(schema)
@resolver_map.keys.each do |type_name|
resolver_type = schema.types[type_name]
next unless resolver_type.kind.abstract?
expanded_types = Util.expand_abstract_type(schema, resolver_type)
expanded_types.select { @candidate_types_by_name_and_location[_1.graphql_name].length > 1 }.each do |expanded_type|
@resolver_map[expanded_type.graphql_name] ||= []
@resolver_map[expanded_type.graphql_name].push(*@resolver_map[type_name])
end
end
end
# @!scope class
# @!visibility private
def build_enum_usage_map(schemas)
reads = []
writes = []
schemas.each do |schema|
introspection_types = schema.introspection_system.types.keys
schema.types.each_value do |type|
next if introspection_types.include?(type.graphql_name)
if type.kind.object? || type.kind.interface?
type.fields.each_value do |field|
field_type = field.type.unwrap
reads << field_type.graphql_name if field_type.kind.enum?
field.arguments.each_value do |argument|
argument_type = argument.type.unwrap
writes << argument_type.graphql_name if argument_type.kind.enum?
end
end
elsif type.kind.input_object?
type.arguments.each_value do |argument|
argument_type = argument.type.unwrap
writes << argument_type.graphql_name if argument_type.kind.enum?
end
end
end
end
usage = reads.tap(&:uniq!).each_with_object({}) do |enum_name, memo|
memo[enum_name] ||= []
memo[enum_name] << :read
end
writes.tap(&:uniq!).each_with_object(usage) do |enum_name, memo|
memo[enum_name] ||= []
memo[enum_name] << :write
end
end
private
def reset!
@field_map = {}
@resolver_map = {}
@mapped_type_names = {}
@candidate_directives_by_name_and_location = nil
@schema_directives = nil
end
end
end
end