Module: Trailblazer::Developer::Wtf

Defined in:
lib/trailblazer/developer/wtf.rb,
lib/trailblazer/developer/wtf/renderer.rb

Defined Under Namespace

Modules: Exception, Renderer

Class Method Summary collapse

Class Method Details

.invoke(activity, ctx, flow_options, present_options: {}, **circuit_options) ⇒ Object

Run activity with tracing enabled and inject a mutable Stack instance. This allows to display the trace even when an exception happened



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# File 'lib/trailblazer/developer/wtf.rb', line 17

def invoke(activity, (ctx, flow_options), present_options: {}, **circuit_options)
  flow_options ||= {}
  local_present_options_block = ->(*) { {} }

  stack = Trace::Stack.new # unfortunately, we need this mutable object before things break.
  raise_exception = false

  begin
    complete_stack, signal, (ctx, flow_options) = Trace.invoke(
      activity,
      [ctx, flow_options.merge(stack: stack)],
      **circuit_options
    )
  rescue
    raise_exception = $! # TODO: will this show the very same stacktrace?

    exception_source  = Exception.find_exception_source(stack, $!)
    complete_stack    = stack

    local_present_options_block = ->(trace_nodes:, **) {
      exception_source_node = trace_nodes.reverse.find do |trace_node|
        trace_node.snapshot_after == exception_source || trace_node.snapshot_before == exception_source
      end

      {
        # we can hand in options per node, identified by their captured_input part.
        node_options: {
          exception_source_node => {data: {exception_source: true}}, # goes to {Debugger::Node.build}
        },
        style: {
          exception_source_node => [:red, :bold]
        },
      }
    }
  end

  # always render the trace.
  output, returned_args = Trace::Present.(
    complete_stack,
    renderer:   Wtf::Renderer,
    color_map:  Wtf::Renderer::DEFAULT_COLOR_MAP.merge(flow_options[:color_map] || {}),
    activity:   activity,
    **present_options,
    &local_present_options_block
  )

  puts output

  raise raise_exception if raise_exception
  return signal, [ctx, flow_options], circuit_options, output, returned_args
end