debian-mirror-gitlab/tooling/graphql/docs/helper.rb
2021-11-11 11:23:49 +05:30

438 lines
14 KiB
Ruby

# frozen_string_literal: true
require 'gitlab/utils/strong_memoize'
module Tooling
module Graphql
module Docs
# We assume a few things about the schema. We use the graphql-ruby gem, which enforces:
# - All mutations have a single input field named 'input'
# - All mutations have a payload type, named after themselves
# - All mutations have an input type, named after themselves
# If these things change, then some of this code will break. Such places
# are guarded with an assertion that our assumptions are not violated.
ViolatedAssumption = Class.new(StandardError)
SUGGESTED_ACTION = <<~MSG
We expect it to be impossible to violate our assumptions about
how mutation arguments work.
If that is not the case, then something has probably changed in the
way we generate our schema, perhaps in the library we use: graphql-ruby
Please ask for help in the #f_graphql or #backend channels.
MSG
CONNECTION_ARGS = %w[after before first last].to_set
FIELD_HEADER = <<~MD
#### Fields
| Name | Type | Description |
| ---- | ---- | ----------- |
MD
ARG_HEADER = <<~MD
# Arguments
| Name | Type | Description |
| ---- | ---- | ----------- |
MD
CONNECTION_NOTE = <<~MD
This field returns a [connection](#connections). It accepts the
four standard [pagination arguments](#connection-pagination-arguments):
`before: String`, `after: String`, `first: Int`, `last: Int`.
MD
# Helper with functions to be used by HAML templates
# This includes graphql-docs gem helpers class.
# You can check the included module on: https://github.com/gjtorikian/graphql-docs/blob/v1.6.0/lib/graphql-docs/helpers.rb
module Helper
include GraphQLDocs::Helpers
include Gitlab::Utils::StrongMemoize
def auto_generated_comment
<<-MD.strip_heredoc
---
stage: Ecosystem
group: Integrations
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
---
<!---
This documentation is auto generated by a script.
Please do not edit this file directly, check compile_docs task on lib/tasks/gitlab/graphql.rake.
--->
MD
end
# Template methods:
# Methods that return chunks of Markdown for insertion into the document
def render_full_field(field, heading_level: 3, owner: nil)
conn = connection?(field)
args = field[:arguments].reject { |arg| conn && CONNECTION_ARGS.include?(arg[:name]) }
arg_owner = [owner, field[:name]]
chunks = [
render_name_and_description(field, level: heading_level, owner: owner),
render_return_type(field),
render_input_type(field),
render_connection_note(field),
render_argument_table(heading_level, args, arg_owner),
render_return_fields(field, owner: owner)
]
join(:block, chunks)
end
def render_argument_table(level, args, owner)
arg_header = ('#' * level) + ARG_HEADER
render_field_table(arg_header, args, owner)
end
def render_name_and_description(object, owner: nil, level: 3)
content = []
heading = '#' * level
name = [owner, object[:name]].compact.join('.')
content << "#{heading} `#{name}`"
content << render_description(object, owner, :block)
join(:block, content)
end
def render_object_fields(fields, owner:, level_bump: 0)
return if fields.blank?
(with_args, no_args) = fields.partition { |f| args?(f) }
type_name = owner[:name] if owner
header_prefix = '#' * level_bump
sections = [
render_simple_fields(no_args, type_name, header_prefix),
render_fields_with_arguments(with_args, type_name, header_prefix)
]
join(:block, sections)
end
def render_enum_value(enum, value)
render_row(render_name(value, enum[:name]), render_description(value, enum[:name], :inline))
end
def render_union_member(member)
"- [`#{member}`](##{member.downcase})"
end
# QUERIES:
# Methods that return parts of the schema, or related information:
def connection_object_types
objects.select { |t| t[:is_edge] || t[:is_connection] }
end
def object_types
objects.reject { |t| t[:is_edge] || t[:is_connection] || t[:is_payload] }
end
def interfaces
graphql_interface_types.map { |t| t.merge(fields: t[:fields] + t[:connections]) }
end
def fields_of(type_name)
graphql_operation_types
.find { |type| type[:name] == type_name }
.values_at(:fields, :connections)
.flatten
.then { |fields| sorted_by_name(fields) }
end
# Place the arguments of the input types on the mutation itself.
# see: `#input_types` - this method must not call `#input_types` to avoid mutual recursion
def mutations
@mutations ||= sorted_by_name(graphql_mutation_types).map do |t|
inputs = t[:input_fields]
input = inputs.first
name = t[:name]
assert!(inputs.one?, "Expected exactly 1 input field named #{name}. Found #{inputs.count} instead.")
assert!(input[:name] == 'input', "Expected the input of #{name} to be named 'input'")
input_type_name = input[:type][:name]
input_type = graphql_input_object_types.find { |t| t[:name] == input_type_name }
assert!(input_type.present?, "Cannot find #{input_type_name} for #{name}.input")
arguments = input_type[:input_fields]
seen_type!(input_type_name)
t.merge(arguments: arguments)
end
end
# We assume that the mutations have been processed first, marking their
# inputs as `seen_type?`
def input_types
mutations # ensure that mutations have seen their inputs first
graphql_input_object_types.reject { |t| seen_type?(t[:name]) }
end
# We ignore the built-in enum types, and sort values by name
def enums
graphql_enum_types
.reject { |type| type[:values].empty? }
.reject { |enum_type| enum_type[:name].start_with?('__') }
.map { |type| type.merge(values: sorted_by_name(type[:values])) }
end
private # DO NOT CALL THESE METHODS IN TEMPLATES
# Template methods
def render_return_type(query)
return unless query[:type] # for example, mutations
"Returns #{render_field_type(query[:type])}."
end
def render_simple_fields(fields, type_name, header_prefix)
render_field_table(header_prefix + FIELD_HEADER, fields, type_name)
end
def render_fields_with_arguments(fields, type_name, header_prefix)
return if fields.empty?
level = 5 + header_prefix.length
sections = sorted_by_name(fields).map do |f|
render_full_field(f, heading_level: level, owner: type_name)
end
<<~MD.chomp
#{header_prefix}#### Fields with arguments
#{join(:block, sections)}
MD
end
def render_field_table(header, fields, owner)
return if fields.empty?
fields = sorted_by_name(fields)
header + join(:table, fields.map { |f| render_field(f, owner) })
end
def render_field(field, owner)
render_row(
render_name(field, owner),
render_field_type(field[:type]),
render_description(field, owner, :inline)
)
end
def render_return_fields(mutation, owner:)
fields = mutation[:return_fields]
return if fields.blank?
name = owner.to_s + mutation[:name]
render_object_fields(fields, owner: { name: name })
end
def render_connection_note(field)
return unless connection?(field)
CONNECTION_NOTE.chomp
end
def render_row(*values)
"| #{values.map { |val| val.to_s.squish }.join(' | ')} |"
end
def render_name(object, owner = nil)
rendered_name = "`#{object[:name]}`"
rendered_name += ' **{warning-solid}**' if deprecated?(object, owner)
return rendered_name unless owner
owner = Array.wrap(owner).join('')
id = (owner + object[:name]).downcase
%(<a id="#{id}"></a>) + rendered_name
end
# Returns the object description. If the object has been deprecated,
# the deprecation reason will be returned in place of the description.
def render_description(object, owner = nil, context = :block)
if deprecated?(object, owner)
render_deprecation(object, owner, context)
else
render_description_of(object, owner, context)
end
end
def deprecated?(object, owner)
return true if object[:is_deprecated] # only populated for fields, not arguments!
key = [*Array.wrap(owner), object[:name]].join('.')
deprecations.key?(key)
end
def render_description_of(object, owner, context = nil)
desc = if object[:is_edge]
base = object[:name].chomp('Edge')
"The edge type for [`#{base}`](##{base.downcase})."
elsif object[:is_connection]
base = object[:name].chomp('Connection')
"The connection type for [`#{base}`](##{base.downcase})."
else
object[:description]&.strip
end
return if desc.blank?
desc += '.' unless desc.ends_with?('.')
see = doc_reference(object, owner)
desc += " #{see}" if see
desc += " (see [Connections](#connections))" if connection?(object) && context != :block
desc
end
def doc_reference(object, owner)
field = schema_field(owner, object[:name]) if owner
return unless field
ref = field.try(:doc_reference)
return if ref.blank?
parts = ref.to_a.map do |(title, url)|
"[#{title.strip}](#{url.strip})"
end
"See #{parts.join(', ')}."
end
def render_deprecation(object, owner, context)
buff = []
deprecation = schema_deprecation(owner, object[:name])
buff << (deprecation&.original_description || render_description_of(object, owner)) if context == :block
buff << if deprecation
deprecation.markdown(context: context)
else
"**Deprecated:** #{object[:deprecation_reason]}"
end
join(context, buff)
end
def render_field_type(type)
"[`#{type[:info]}`](##{type[:name].downcase})"
end
def join(context, chunks)
chunks.compact!
return if chunks.blank?
case context
when :block
chunks.join("\n\n")
when :inline
chunks.join(" ").squish.presence
when :table
chunks.join("\n")
end
end
# Queries
def sorted_by_name(objects)
return [] unless objects.present?
objects.sort_by { |o| o[:name] }
end
def connection?(field)
type_name = field.dig(:type, :name)
type_name.present? && type_name.ends_with?('Connection')
end
# We are ignoring connections and built in types for now,
# they should be added when queries are generated.
def objects
strong_memoize(:objects) do
mutations = schema.mutation&.fields&.keys&.to_set || []
graphql_object_types
.reject { |object_type| object_type[:name]["__"] || object_type[:name] == 'Subscription' } # We ignore introspection and subscription types.
.map do |type|
name = type[:name]
type.merge(
is_edge: name.ends_with?('Edge'),
is_connection: name.ends_with?('Connection'),
is_payload: name.ends_with?('Payload') && mutations.include?(name.chomp('Payload').camelcase(:lower)),
fields: type[:fields] + type[:connections]
)
end
end
end
def args?(field)
args = field[:arguments]
return false if args.blank?
return true unless connection?(field)
args.any? { |arg| CONNECTION_ARGS.exclude?(arg[:name]) }
end
# returns the deprecation information for a field or argument
# See: Gitlab::Graphql::Deprecation
def schema_deprecation(type_name, field_name)
key = [*Array.wrap(type_name), field_name].join('.')
deprecations[key]
end
def render_input_type(query)
input_field = query[:input_fields]&.first
return unless input_field
"Input type: `#{input_field[:type][:name]}`"
end
def schema_field(type_name, field_name)
type = schema.types[type_name]
return unless type && type.kind.fields?
type.fields[field_name]
end
def deprecations
strong_memoize(:deprecations) do
mapping = {}
schema.types.each do |type_name, type|
if type.kind.fields?
type.fields.each do |field_name, field|
mapping["#{type_name}.#{field_name}"] = field.try(:deprecation)
field.arguments.each do |arg_name, arg|
mapping["#{type_name}.#{field_name}.#{arg_name}"] = arg.try(:deprecation)
end
end
elsif type.kind.enum?
type.values.each do |member_name, enum|
mapping["#{type_name}.#{member_name}"] = enum.try(:deprecation)
end
end
end
mapping.compact
end
end
def assert!(claim, message)
raise ViolatedAssumption, "#{message}\n#{SUGGESTED_ACTION}" unless claim
end
end
end
end
end