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

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

{}.freeze

Class Method Summary collapse

Class Method Details

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

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:

  • (Array<Hash>) —

    One result per query



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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
      GraphQL::Query.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)
  multiplex.trace("execute_multiplex", { multiplex: multiplex }) do
    schema = multiplex.schema
    queries = multiplex.queries
    query_instrumenters = schema.instrumenters[:query]
    multiplex_instrumenters = schema.instrumenters[:multiplex]

    # First, run multiplex instrumentation, then query instrumentation for each query
    call_hooks(multiplex_instrumenters, multiplex, :before_multiplex, :after_multiplex) do
      each_query_call_hooks(query_instrumenters, queries) do
        schema = multiplex.schema
        multiplex_analyzers = schema.multiplex_analyzers
        queries = multiplex.queries
        if multiplex.max_complexity
          multiplex_analyzers += [GraphQL::Analysis::AST::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.new
          # Do as much eager evaluation of the query as possible
          results = []
          queries.each_with_index do |query, idx|
            multiplex.dataloader.append_job {
              operation = query.selected_operation
              result = if operation.nil? || !query.valid? || query.context.errors.any?
                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)
                  query.context.namespace(:interpreter)[:runtime] = runtime

                  query.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 {
            tracer = multiplex
            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]
              # it might not be present if the query has an error
              runtime ? runtime.final_result : nil
            end
            final_values.compact!
            tracer.trace("execute_query_lazy", {multiplex: multiplex, query: query}) do
              Interpreter::Resolve.resolve_all(final_values, multiplex.dataloader)
            end
            queries.each do |query|
              runtime = query.context.namespace(:interpreter)[:runtime]
              if runtime
                runtime.delete_interpreter_context(:current_path)
                runtime.delete_interpreter_context(:current_field)
                runtime.delete_interpreter_context(:current_object)
                runtime.delete_interpreter_context(:current_arguments)
              end
            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]
            # 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.any?
                # A bit weird, but `Query#static_errors` _includes_ `query.context.errors`
                { "errors" => query.static_errors.map(&:to_h) }
              else
                data_result
              end
            else
              result = {
                "data" => query.context.namespace(:interpreter)[:runtime].final_result
              }

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

              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
        end
      end
    end
  end
end