app/controllers/graphql_controller.rb
class GraphqlController < ApplicationController
skip_before_action :verify_authenticity_token
skip_authorization_check
class QueryStringError < StandardError; end
def query
begin
if query_string.nil? then raise GraphqlController::QueryStringError end
response = consul_schema.execute query_string, variables: query_variables
render json: response, status: :ok
rescue GraphqlController::QueryStringError
render json: { message: 'Query string not present' }, status: :bad_request
rescue JSON::ParserError
render json: { message: 'Error parsing JSON' }, status: :bad_request
rescue GraphQL::ParseError
render json: { message: 'Query string is not valid JSON' }, status: :bad_request
rescue
unless Rails.env.production? then raise end
end
end
private
def consul_schema
api_types = GraphQL::ApiTypesCreator.create(API_TYPE_DEFINITIONS)
query_type = GraphQL::QueryTypeCreator.create(api_types)
GraphQL::Schema.define do
query query_type
max_depth 8
max_complexity 2500
end
end
def query_string
if request.headers["CONTENT_TYPE"] == 'application/graphql'
request.body.string # request.body.class => StringIO
else
params[:query]
end
end
def query_variables
if params[:variables].blank? || params[:variables] == 'null'
{}
else
JSON.parse(params[:variables])
end
end
end