Class: GraphQL::Client

Inherits:
Object
  • Object
show all
Extended by:
CollocatedEnforcement
Defined in:
lib/graphql/client.rb,
lib/graphql/client/http.rb,
lib/graphql/client/list.rb,
lib/graphql/client/error.rb,
lib/graphql/client/errors.rb,
lib/graphql/client/erubis.rb,
lib/graphql/client/railtie.rb,
lib/graphql/client/response.rb,
lib/graphql/client/view_module.rb,
lib/graphql/client/query_result.rb,
lib/graphql/client/document_types.rb,
lib/graphql/client/log_subscriber.rb,
lib/graphql/client/query_typename.rb,
lib/graphql/client/collocated_enforcement.rb,
lib/graphql/client/hash_with_indifferent_access.rb

Overview

GraphQL Client helps build and execute queries against a GraphQL backend.

A client instance SHOULD be configured with a schema to enable query validation. And SHOULD also be configured with a backend “execute” adapter to point at a remote GraphQL HTTP service or execute directly against a Schema object.

Defined Under Namespace

Modules: CollocatedEnforcement, DocumentTypes, LazyName, QueryTypename, ViewModule Classes: Definition, DynamicQueryError, Error, Errors, Erubis, FragmentDefinition, HTTP, HashWithIndifferentAccess, List, LogSubscriber, NonCollocatedCallerError, NotImplementedError, OperationDefinition, QueryResult, Railtie, Response, ValidationError

Constant Summary collapse

IntrospectionDocument =
GraphQL.parse(GraphQL::Introspection::INTROSPECTION_QUERY).deep_freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from CollocatedEnforcement

allow_noncollocated_callers

Constructor Details

#initialize(schema:, execute: nil, enforce_collocated_callers: false) ⇒ Client

Returns a new instance of Client.



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# File 'lib/graphql/client.rb', line 81

def initialize(schema:, execute: nil, enforce_collocated_callers: false)
  @schema = self.class.load_schema(schema)
  @execute = execute
  @document = GraphQL::Language::Nodes::Document.new(definitions: [])
  @document_tracking_enabled = false
  @allow_dynamic_queries = false
  @enforce_collocated_callers = enforce_collocated_callers
end

Instance Attribute Details

#allow_dynamic_queriesObject

Deprecated: Allow dynamically generated queries to be passed to Client#query.

This ability will eventually be removed in future versions.



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# File 'lib/graphql/client.rb', line 39

def allow_dynamic_queries
  @allow_dynamic_queries
end

#documentObject (readonly)

Returns the value of attribute document.



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# File 'lib/graphql/client.rb', line 296

def document
  @document
end

#document_tracking_enabledObject

Returns the value of attribute document_tracking_enabled.



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# File 'lib/graphql/client.rb', line 30

def document_tracking_enabled
  @document_tracking_enabled
end

#enforce_collocated_callersObject (readonly)

Public: Check if collocated caller enforcement is enabled.



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# File 'lib/graphql/client.rb', line 33

def enforce_collocated_callers
  @enforce_collocated_callers
end

#executeObject (readonly)

Returns the value of attribute execute.



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# File 'lib/graphql/client.rb', line 28

def execute
  @execute
end

#schemaObject (readonly)

Returns the value of attribute schema.



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# File 'lib/graphql/client.rb', line 28

def schema
  @schema
end

Class Method Details

.dump_schema(schema, io = nil) ⇒ Object



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# File 'lib/graphql/client.rb', line 60

def self.dump_schema(schema, io = nil)
  unless schema.respond_to?(:execute)
    raise TypeError, "expected schema to respond to #execute(), but was #{schema.class}"
  end

  result = schema.execute(
    document: IntrospectionDocument,
    operation_name: "IntrospectionQuery",
    variables: {},
    context: {}
  )

  if io
    io = File.open(io, "w") if io.is_a?(String)
    io.write(JSON.pretty_generate(result))
    io.close_write
  end

  result
end

.load_schema(schema) ⇒ Object



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# File 'lib/graphql/client.rb', line 41

def self.load_schema(schema)
  case schema
  when GraphQL::Schema
    schema
  when Hash
    GraphQL::Schema::Loader.load(schema)
  when String
    if schema.end_with?(".json") && File.exist?(schema)
      load_schema(File.read(schema))
    elsif schema =~ /\A\s*{/
      load_schema(JSON.parse(schema))
    end
  else
    load_schema(dump_schema(schema)) if schema.respond_to?(:execute)
  end
end

Instance Method Details

#parse(str, filename = nil, lineno = nil) ⇒ Object



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# File 'lib/graphql/client.rb', line 180

def parse(str, filename = nil, lineno = nil)
  if filename.nil? && lineno.nil?
    location = caller_locations(1, 1).first
    filename = location.path
    lineno = location.lineno
  end

  unless filename.is_a?(String)
    raise TypeError, "expected filename to be a String, but was #{filename.class}"
  end

  unless lineno.is_a?(Integer)
    raise TypeError, "expected lineno to be a Integer, but was #{lineno.class}"
  end

  source_location = [filename, lineno].freeze

  definition_dependencies = Set.new

  str = str.gsub(/\.\.\.([a-zA-Z0-9_]+(::[a-zA-Z0-9_]+)+)/) do
    match = Regexp.last_match
    const_name = match[1]
    begin
      fragment = ActiveSupport::Inflector.constantize(const_name)
    rescue NameError
      fragment = nil
    end

    case fragment
    when FragmentDefinition
      definition_dependencies.merge(fragment.document.definitions)
      "...#{fragment.definition_name}"
    else
      if fragment
        message = "expected #{const_name} to be a #{FragmentDefinition}, but was a #{fragment.class}."
        if fragment.is_a?(Module) && fragment.constants.any?
          message += " Did you mean #{fragment}::#{fragment.constants.first}?"
        end
      else
        message = "uninitialized constant #{const_name}"
      end

      error = ValidationError.new(message)
      error.set_backtrace(["#{filename}:#{lineno + match.pre_match.count("\n") + 1}"] + caller)
      raise error
    end
  end

  doc = GraphQL.parse(str)

  doc.definitions.each do |node|
    node.name ||= "__anonymous__"
  end

  document_dependencies = Language::Nodes::Document.new(definitions: doc.definitions + definition_dependencies.to_a)

  rules = GraphQL::StaticValidation::ALL_RULES - [GraphQL::StaticValidation::FragmentsAreUsed]
  validator = GraphQL::StaticValidation::Validator.new(schema: self.schema, rules: rules)
  query = GraphQL::Query.new(self.schema, document: document_dependencies)

  errors = validator.validate(query)
  errors.fetch(:errors).each do |error|
    error_hash = error.to_h
    validation_line = error_hash["locations"][0]["line"]
    error = ValidationError.new(error_hash["message"])
    error.set_backtrace(["#{filename}:#{lineno + validation_line}"] + caller)
    raise error
  end

  document_types = DocumentTypes.analyze_types(self.schema, doc).freeze

  QueryTypename.insert_typename_fields(doc, types: document_types)

  definitions = {}
  doc.definitions.each do |node|
    node.name = nil if node.name == "__anonymous__"
    sliced_document = Language::DefinitionSlice.slice(document_dependencies, node.name)
    definition = Definition.for(
      schema: self.schema,
      node: node,
      document: sliced_document,
      document_types: document_types,
      source_location: source_location,
      enforce_collocated_callers: enforce_collocated_callers
    )
    definitions[node.name] = definition
  end

  rename_node = ->(node, _parent) do
    definition = definitions[node.name]
    if definition
      node.extend(LazyName)
      node.name = -> { definition.definition_name }
    end
  end
  visitor = Language::Visitor.new(doc)
  visitor[Language::Nodes::FragmentDefinition].leave << rename_node
  visitor[Language::Nodes::OperationDefinition].leave << rename_node
  visitor[Language::Nodes::FragmentSpread].leave << rename_node
  visitor.visit

  doc.deep_freeze

  document.definitions.concat(doc.definitions) if document_tracking_enabled

  if definitions[nil]
    definitions[nil]
  else
    Module.new do
      definitions.each do |name, definition|
        const_set(name, definition)
      end
    end
  end
end

#query(definition, variables: {}, context: {}) ⇒ Object



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# File 'lib/graphql/client.rb', line 298

def query(definition, variables: {}, context: {})
  raise NotImplementedError, "client network execution not configured" unless execute

  unless definition.is_a?(OperationDefinition)
    raise TypeError, "expected definition to be a #{OperationDefinition.name} but was #{document.class.name}"
  end

  if allow_dynamic_queries == false && definition.name.nil?
    raise DynamicQueryError, "expected definition to be assigned to a static constant https://git.io/vXXSE"
  end

  variables = deep_stringify_keys(variables)

  document = definition.document
  operation = definition.definition_node

  payload = {
    document: document,
    operation_name: operation.name,
    operation_type: operation.operation_type,
    variables: variables,
    context: context
  }

  result = ActiveSupport::Notifications.instrument("query.graphql", payload) do
    execute.execute(
      document: document,
      operation_name: operation.name,
      variables: variables,
      context: context
    )
  end

  data, errors, extensions = result.values_at("data", "errors", "extensions")

  errors ||= []
  GraphQL::Client::Errors.normalize_error_paths(data, errors)

  errors.each do |error|
    error_payload = payload.merge(message: error["message"], error: error)
    ActiveSupport::Notifications.instrument("error.graphql", error_payload)
  end

  Response.new(
    data: definition.new(data, Errors.new(errors, ["data"])),
    errors: Errors.new(errors),
    extensions: extensions
  )
end