Module: GraphQL::Backtrace::LegacyTracer

Defined in:
lib/graphql/backtrace/legacy_tracer.rb

Class Method Summary collapse

Class Method Details

.trace(key, metadata) ⇒ Object

Implement the Tracing API.



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# File 'lib/graphql/backtrace/legacy_tracer.rb', line 8

def trace(key, metadata)
  case key
  when "lex", "parse"
    # No context here, don't have a query yet
    nil
  when "execute_multiplex", "analyze_multiplex"
    # No query context yet
    nil
  when "validate", "analyze_query", "execute_query", "execute_query_lazy"
    query = metadata[:query] || metadata[:queries].first
    push_data = query
    multiplex = query.multiplex
  when "execute_field", "execute_field_lazy"
    # The interpreter passes `query:`, legacy passes `context:`
    context = metadata[:context] || ((q = metadata[:query]) && q.context)
    push_data = context
    multiplex = context.query.multiplex
  else
    # Custom key, no backtrace data for this
    nil
  end

  if push_data
    multiplex.context[:last_graphql_backtrace_context] = push_data
  end

  if key == "execute_multiplex"
    begin
      yield
    rescue StandardError => err
      # This is an unhandled error from execution,
      # Re-raise it with a GraphQL trace.
      potential_context = metadata[:multiplex].context[:last_graphql_backtrace_context]

      if potential_context.is_a?(GraphQL::Query::Context) || potential_context.is_a?(GraphQL::Query::Context::FieldResolutionContext)
        raise TracedError.new(err, potential_context)
      else
        raise
      end
    ensure
      metadata[:multiplex].context.delete(:last_graphql_backtrace_context)
    end
  else
    yield
  end
end