Class: GraphQL::Execution::Interpreter

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/execution/interpreter.rb,
lib/graphql/execution/interpreter/resolve.rb,
lib/graphql/execution/interpreter/runtime.rb,
lib/graphql/execution/interpreter/arguments.rb,
lib/graphql/execution/interpreter/argument_value.rb,
lib/graphql/execution/interpreter/arguments_cache.rb,
lib/graphql/execution/interpreter/execution_errors.rb,
lib/graphql/execution/interpreter/handles_raw_value.rb,
lib/graphql/execution/interpreter/runtime/graphql_result.rb

Defined Under Namespace

Modules: Resolve Classes: ArgumentValue, Arguments, ArgumentsCache, ExecutionErrors, ListResultFailedError, RawValue, Runtime

Constant Summary collapse

NO_OPERATION =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

Used internally to signal that the query shouldn't be executed

GraphQL::EmptyObjects::EMPTY_HASH

Class Method Summary collapse

Class Method Details

.run_all(schema, query_options, context: {}, max_complexity: schema.max_complexity) ⇒ Array<GraphQL::Query::Result>

Returns One result per query.

Parameters:

  • schema (GraphQL::Schema)
  • queries (Array<GraphQL::Query, Hash>)
  • context (Hash) (defaults to: {})
  • max_complexity (Integer, nil) (defaults to: schema.max_complexity)

Returns:



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# File 'lib/graphql/execution/interpreter.rb', line 24

def run_all(schema, query_options, context: {}, max_complexity: schema.max_complexity)
  queries = query_options.map do |opts|
    case opts
    when Hash
      schema.query_class.new(schema, nil, **opts)
    when GraphQL::Query
      opts
    else
      raise "Expected Hash or GraphQL::Query, not #{opts.class} (#{opts.inspect})"
    end
  end

  multiplex = Execution::Multiplex.new(schema: schema, queries: queries, context: context, max_complexity: max_complexity)
  Fiber[:__graphql_current_multiplex] = multiplex
  multiplex.current_trace.execute_multiplex(multiplex: multiplex) do
    schema = multiplex.schema
    queries = multiplex.queries
    lazies_at_depth = Hash.new { |h, k| h[k] = [] }
    multiplex_analyzers = schema.multiplex_analyzers
    if multiplex.max_complexity
      multiplex_analyzers += [GraphQL::Analysis::MaxQueryComplexity]
    end

    schema.analysis_engine.analyze_multiplex(multiplex, multiplex_analyzers)
    begin
      # Since this is basically the batching context,
      # share it for a whole multiplex
      multiplex.context[:interpreter_instance] ||= multiplex.schema.query_execution_strategy(deprecation_warning: false).new
      # Do as much eager evaluation of the query as possible
      results = []
      queries.each_with_index do |query, idx|
        if query.subscription? && !query.subscription_update?
          subs_namespace = query.context.namespace(:subscriptions)
          subs_namespace[:events] = []
          subs_namespace[:subscriptions] = {}
        end
        multiplex.dataloader.append_job {
          operation = query.selected_operation
          result = if operation.nil? || !query.valid? || !query.context.errors.empty?
            NO_OPERATION
          else
            begin
              # Although queries in a multiplex _share_ an Interpreter instance,
              # they also have another item of state, which is private to that query
              # in particular, assign it here:
              runtime = Runtime.new(query: query, lazies_at_depth: lazies_at_depth)
              query.context.namespace(:interpreter_runtime)[:runtime] = runtime

              query.current_trace.execute_query(query: query) do
                runtime.run_eager
              end
            rescue GraphQL::ExecutionError => err
              query.context.errors << err
              NO_OPERATION
            end
          end
          results[idx] = result
        }
      end

      multiplex.dataloader.run

      # Then, work through lazy results in a breadth-first way
      multiplex.dataloader.append_job {
        query = multiplex.queries.length == 1 ? multiplex.queries[0] : nil
        queries = multiplex ? multiplex.queries : [query]
        final_values = queries.map do |query|
          runtime = query.context.namespace(:interpreter_runtime)[:runtime]
          # it might not be present if the query has an error
          runtime ? runtime.final_result : nil
        end
        final_values.compact!
        multiplex.current_trace.execute_query_lazy(multiplex: multiplex, query: query) do
          Interpreter::Resolve.resolve_each_depth(lazies_at_depth, multiplex.dataloader)
        end
      }
      multiplex.dataloader.run

      # Then, find all errors and assign the result to the query object
      results.each_with_index do |data_result, idx|
        query = queries[idx]
        if (events = query.context.namespace(:subscriptions)[:events]) && !events.empty?
          schema.subscriptions.write_subscription(query, events)
        end
        # Assign the result so that it can be accessed in instrumentation
        query.result_values = if data_result.equal?(NO_OPERATION)
          if !query.valid? || !query.context.errors.empty?
            # A bit weird, but `Query#static_errors` _includes_ `query.context.errors`
            { "errors" => query.static_errors.map(&:to_h) }
          else
            data_result
          end
        else
          result = {}

          if !query.context.errors.empty?
            error_result = query.context.errors.map(&:to_h)
            result["errors"] = error_result
          end

          result["data"] = query.context.namespace(:interpreter_runtime)[:runtime].final_result

          result
        end
        if query.context.namespace?(:__query_result_extensions__)
          query.result_values["extensions"] = query.context.namespace(:__query_result_extensions__)
        end
        # Get the Query::Result, not the Hash
        results[idx] = query.result
      end

      results
    rescue Exception
      # TODO rescue at a higher level so it will catch errors in analysis, too
      # Assign values here so that the query's `@executed` becomes true
      queries.map { |q| q.result_values ||= {} }
      raise
    ensure
      Fiber[:__graphql_current_multiplex] = nil
      queries.map { |query|
        runtime = query.context.namespace(:interpreter_runtime)[:runtime]
        if runtime
          runtime.delete_all_interpreter_context
        end
      }
    end
  end
end