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|
# frozen_string_literal: true
module LazyHelpers
MAGIC_NUMBER_WITH_LAZY_AUTHORIZED_HOOK = 44
MAGIC_NUMBER_THAT_RETURNS_NIL = 0
MAGIC_NUMBER_THAT_RAISES_ERROR = 13
class Wrapper
def initialize(item = nil, &block)
if block
@block = block
else
@item = item
end
end
def item
if @block
@item = @block.call()
@block = nil
end
@item
end
end
class SumAll
attr_reader :own_value
attr_writer :value
def initialize(own_value)
@own_value = own_value
all << self
end
def value
@value ||= begin
total_value = all.map(&:own_value).reduce(&:+)
all.each { |v| v.value = total_value}
all.clear
total_value
end
@value
end
def all
self.class.all
end
def self.all
@all ||= []
end
end
class LazySum < GraphQL::Schema::Object
field :value, Integer
def value
if object == MAGIC_NUMBER_THAT_RAISES_ERROR
nil
else
object
end
end
def self.authorized?(obj, ctx)
if obj == MAGIC_NUMBER_WITH_LAZY_AUTHORIZED_HOOK
Wrapper.new { true }
else
true
end
end
field :nested_sum, LazySum, null: false do
argument :value, Integer
end
def nested_sum(value:)
if value == MAGIC_NUMBER_THAT_RAISES_ERROR
Wrapper.new(nil)
else
SumAll.new(@object + value)
end
end
field :nullable_nested_sum, LazySum do
argument :value, Integer
end
alias :nullable_nested_sum :nested_sum
end
class LazyQuery < GraphQL::Schema::Object
field :int, Integer, null: false do
argument :value, Integer
argument :plus, Integer, required: false, default_value: 0
end
def int(value:, plus:)
Wrapper.new(value + plus)
end
field :nested_sum, LazySum, null: false do
argument :value, Integer
end
def nested_sum(value:)
SumAll.new(value)
end
field :nullable_nested_sum, LazySum do
argument :value, Integer
end
def nullable_nested_sum(value:)
if value == MAGIC_NUMBER_THAT_RAISES_ERROR
Wrapper.new { raise GraphQL::ExecutionError.new("#{MAGIC_NUMBER_THAT_RAISES_ERROR} is unlucky") }
elsif value == MAGIC_NUMBER_THAT_RETURNS_NIL
nil
else
SumAll.new(value)
end
end
field :list_sum, [LazySum, null: true] do
argument :values, [Integer]
end
def list_sum(values:)
values.map { |v| v == MAGIC_NUMBER_THAT_RETURNS_NIL ? nil : v }
end
end
module SumAllInstrumentation
def execute_query(query:)
add_check(query, "before #{query.selected_operation.name}")
super
end
def execute_query_lazy(query:, multiplex:)
result = super
multiplex.queries.reverse_each do |q|
add_check(q, "after #{q.selected_operation.name}")
end
result
end
def execute_multiplex(multiplex:)
add_check(multiplex, "before multiplex 1")
# TODO not threadsafe
# This should use multiplex-level context
SumAll.all.clear
result = super
add_check(multiplex, "after multiplex 1")
result
end
private
def add_check(object, text)
checks = object.context[:instrumentation_checks]
if checks
checks << text
end
end
end
module SumAllInstrumentation2
def execute_multiplex(multiplex:)
add_check(multiplex, "before multiplex 2")
result = super
add_check(multiplex, "after multiplex 2")
result
end
private
def add_check(object, text)
checks = object.context[:instrumentation_checks]
if checks
checks << text
end
end
end
class LazySchema < GraphQL::Schema
query(LazyQuery)
mutation(LazyQuery)
lazy_resolve(Wrapper, :item)
lazy_resolve(SumAll, :value)
trace_with(SumAllInstrumentation2)
trace_with(SumAllInstrumentation)
def self.sync_lazy(lazy)
if lazy.is_a?(SumAll) && lazy.own_value > 1000
lazy.value # clear the previous set
lazy.own_value - 900
else
super
end
end
end
def run_query(query_str, **rest)
LazySchema.execute(query_str, **rest)
end
end
|
