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# frozen_string_literal: true
module GraphqlHelpers
MutationDefinition = Struct.new(:query, :variables)
NoData = Class.new(StandardError)
# makes an underscored string look like a fieldname
# "merge_request" => "mergeRequest"
def self.fieldnamerize(underscored_field_name)
underscored_field_name.to_s.camelize(:lower)
end
# Run a loader's named resolver
def resolve(resolver_class, obj: nil, args: {}, ctx: {})
resolver_class.new(object: obj, context: ctx).resolve(args)
end
# Runs a block inside a BatchLoader::Executor wrapper
def batch(max_queries: nil, &blk)
wrapper = proc do
BatchLoader::Executor.ensure_current
yield
ensure
BatchLoader::Executor.clear_current
end
if max_queries
result = nil
expect { result = wrapper.call }.not_to exceed_query_limit(max_queries)
result
else
wrapper.call
end
end
# BatchLoader::GraphQL returns a wrapper, so we need to :sync in order
# to get the actual values
def batch_sync(max_queries: nil, &blk)
result = batch(max_queries: nil, &blk)
result.is_a?(Array) ? result.map(&:sync) : result&.sync
end
def graphql_query_for(name, attributes = {}, fields = nil)
<<~QUERY
{
#{query_graphql_field(name, attributes, fields)}
}
QUERY
end
def graphql_mutation(name, input, fields = nil)
mutation_name = GraphqlHelpers.fieldnamerize(name)
input_variable_name = "$#{input_variable_name_for_mutation(name)}"
mutation_field = GitlabSchema.mutation.fields[mutation_name]
fields ||= all_graphql_fields_for(mutation_field.type)
query = <<~MUTATION
mutation(#{input_variable_name}: #{mutation_field.arguments['input'].type}) {
#{mutation_name}(input: #{input_variable_name}) {
#{fields}
}
}
MUTATION
variables = variables_for_mutation(name, input)
MutationDefinition.new(query, variables)
end
def variables_for_mutation(name, input)
graphql_input = prepare_input_for_mutation(input)
result = { input_variable_name_for_mutation(name) => graphql_input }
# Avoid trying to serialize multipart data into JSON
if graphql_input.values.none? { |value| io_value?(value) }
result.to_json
else
result
end
end
# Recursively convert a Hash with Ruby-style keys to GraphQL fieldname-style keys
#
# prepare_input_for_mutation({ 'my_key' => 1 })
# => { 'myKey' => 1}
def prepare_input_for_mutation(input)
input.map do |name, value|
value = prepare_input_for_mutation(value) if value.is_a?(Hash)
[GraphqlHelpers.fieldnamerize(name), value]
end.to_h
end
def input_variable_name_for_mutation(mutation_name)
mutation_name = GraphqlHelpers.fieldnamerize(mutation_name)
mutation_field = GitlabSchema.mutation.fields[mutation_name]
input_type = field_type(mutation_field.arguments['input'])
GraphqlHelpers.fieldnamerize(input_type)
end
def query_graphql_field(name, attributes = {}, fields = nil)
fields ||= all_graphql_fields_for(name.classify)
attributes = attributes_to_graphql(attributes)
attributes = "(#{attributes})" if attributes.present?
<<~QUERY
#{name}#{attributes}
#{wrap_fields(fields)}
QUERY
end
def wrap_fields(fields)
fields = Array.wrap(fields).join("\n")
return unless fields.present?
<<~FIELDS
{
#{fields}
}
FIELDS
end
def all_graphql_fields_for(class_name, parent_types = Set.new, max_depth: 3)
# pulling _all_ fields can generate a _huge_ query (like complexity 180,000),
# and significantly increase spec runtime. so limit the depth by default
return if max_depth <= 0
allow_unlimited_graphql_complexity
allow_unlimited_graphql_depth
type = GitlabSchema.types[class_name.to_s]
return "" unless type
type.fields.map do |name, field|
# We can't guess arguments, so skip fields that require them
next if required_arguments?(field)
singular_field_type = field_type(field)
# If field type is the same as parent type, then we're hitting into
# mutual dependency. Break it from infinite recursion
next if parent_types.include?(singular_field_type)
if nested_fields?(field)
fields =
all_graphql_fields_for(singular_field_type, parent_types | [type], max_depth: max_depth - 1)
"#{name} { #{fields} }" unless fields.blank?
else
name
end
end.compact.join("\n")
end
def attributes_to_graphql(attributes)
attributes.map do |name, value|
"#{GraphqlHelpers.fieldnamerize(name.to_s)}: \"#{value}\""
end.join(", ")
end
def post_multiplex(queries, current_user: nil, headers: {})
post api('/', current_user, version: 'graphql'), params: { _json: queries }, headers: headers
end
def post_graphql(query, current_user: nil, variables: nil, headers: {})
post api('/', current_user, version: 'graphql'), params: { query: query, variables: variables }, headers: headers
end
def post_graphql_mutation(mutation, current_user: nil)
post_graphql(mutation.query, current_user: current_user, variables: mutation.variables)
end
# Raises an error if no data is found
def graphql_data
json_response['data'] || (raise NoData, graphql_errors)
end
def graphql_errors
case json_response
when Hash # regular query
json_response['errors']
when Array # multiplexed queries
json_response.map { |response| response['errors'] }
else
raise "Unknown GraphQL response type #{json_response.class}"
end
end
# Raises an error if no response is found
def graphql_mutation_response(mutation_name)
graphql_data.fetch(GraphqlHelpers.fieldnamerize(mutation_name))
end
def nested_fields?(field)
!scalar?(field) && !enum?(field)
end
def scalar?(field)
field_type(field).kind.scalar?
end
def enum?(field)
field_type(field).kind.enum?
end
def required_arguments?(field)
field.arguments.values.any? { |argument| argument.type.non_null? }
end
def io_value?(value)
Array.wrap(value).any? { |v| v.respond_to?(:to_io) }
end
def field_type(field)
field_type = field.type
# The type could be nested. For example `[GraphQL::STRING_TYPE]`:
# - List
# - String!
# - String
field_type = field_type.of_type while field_type.respond_to?(:of_type)
field_type
end
# for most tests, we want to allow unlimited complexity
def allow_unlimited_graphql_complexity
allow_any_instance_of(GitlabSchema).to receive(:max_complexity).and_return nil
allow(GitlabSchema).to receive(:max_query_complexity).with(any_args).and_return nil
end
def allow_unlimited_graphql_depth
allow_any_instance_of(GitlabSchema).to receive(:max_depth).and_return nil
allow(GitlabSchema).to receive(:max_query_depth).with(any_args).and_return nil
end
end
# This warms our schema, doing this as part of loading the helpers to avoid
# duplicate loading error when Rails tries autoload the types.
GitlabSchema.graphql_definition
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