Module: Trailblazer::Developer::Wtf

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

Defined Under Namespace

Modules: String

Class Method Summary collapse

Class Method Details

.exception_renderer(stack:, level:, input:, name:, closest_task:) ⇒ Object 



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# File 'lib/trailblazer/developer/wtf.rb', line 46

def exception_renderer(stack:, level:, input:, name:, closest_task:)
  return [ level, %{#{fmt(fmt(name, :red), :bold)}} ] if input.task == closest_task
  [ level, %{#{name}} ]
end

.fmt(line, style) ⇒ Object 



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# File 'lib/trailblazer/developer/wtf.rb', line 63

def fmt(line, style)
  String.send(style, line)
end

.handle(stack, exception, closest_task, activity, *args) ⇒ Object

TODO: make this injectable



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# File 'lib/trailblazer/developer/wtf.rb', line 52

def handle(stack, exception, closest_task, activity, *args)
  puts "[Trailblazer] Exception tracing"
  puts "#{fmt(exception.inspect, :bold)}"
  puts "    #{exception.backtrace[0]}"
  puts "    #{exception.backtrace[1]}"
  puts
  puts Trailblazer::Activity::Trace::Present.(stack, closest_task: closest_task, renderer: method(:exception_renderer))
end

.invoke(activity, ctx, flow_options, *args) ⇒ 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), *args)
  flow_options ||= {} # Ruby sucks.

  # this instance gets mutated with every step. unfortunately, there is
  # no other way in Ruby to keep the trace even when an exception was thrown.
  stack = Trailblazer::Activity::Trace::Stack.new

  begin
    _returned_stack, *returned = Trailblazer::Activity::Trace.invoke( activity,
      [
        ctx,
        flow_options.merge(stack: stack)
      ],
      *args
    )
  rescue
    # DISCUSS: we shouldn't use internal knowledge of the Stack/Level API here.
    closest = stack.to_a
    while closest.is_a?(Trailblazer::Activity::Trace::Level) && closest = closest.last do # FIXME: deep-dive via Stack API.
    end

    # pp closest.task # this was the last executed task

    handle(stack, $!, closest.task, activity, [ctx, flow_options])
  end

  returned # FIXME: test me
end