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lib/absinthe/phase/document/complexity/result.ex
defmodule Absinthe.Phase.Document.Complexity.Result do
@moduledoc false
# Collects complexity errors into the result.
alias Absinthe.{Blueprint, Phase}
use Absinthe.Phase
@doc """
Run the validation.
"""
@spec run(Blueprint.t, Keyword.t) :: Phase.result_t
def run(input, options \\ []) do
max = Keyword.get(options, :max_complexity, :infinity)
operation = Blueprint.current_operation(input)
fun = &handle_node(&1, max, &2)
{operation, errors} = Blueprint.prewalk(operation, [], fun)
result = Blueprint.update_current(input, fn(_) -> operation end)
result = put_in(result.resolution.validation, errors)
case {errors, Map.new(options)} do
{[_|_], %{jump_phases: true, result_phase: abort_phase}} ->
{:jump, result, abort_phase}
_ ->
{:ok, result}
end
end
defp handle_node(%{complexity: complexity} = node, max, errors)
when is_integer(complexity) and complexity > max do
error = error(node, complexity, max)
node =
node
|> flag_invalid(:too_complex)
|> put_error(error)
{node, [error | errors]}
end
defp handle_node(%{complexity: _} = node, _, errors) do
{:halt, node, errors}
end
defp handle_node(node, _, errors) do
{node, errors}
end
defp error(%{source_location: location} = node, complexity, max) do
Phase.Error.new(
__MODULE__,
error_message(node, complexity, max),
location: location
)
end
def error_message(node, complexity, max) do
"#{describe_node(node)} is too complex: complexity is #{complexity} and maximum is #{max}"
end
defp describe_node(%Blueprint.Document.Operation{name: nil}) do
"Operation"
end
defp describe_node(%Blueprint.Document.Operation{name: name}) do
"Operation #{name}"
end
defp describe_node(%Blueprint.Document.Field{name: name}) do
"Field #{name}"
end
end