1 files changed, 32 insertions, 0 deletions
diff --git a/lib/straw.rb b/lib/straw.rb
index 6a882ff..9b2ca96 100644
--- a/lib/straw.rb
+++ b/lib/straw.rb
@@ -13,6 +13,10 @@ module Straw
     end
   end
 
+  def self.tracer
+    @tracer ||= Tracer.new(logger)
+  end
+
   module Memoizable
     def memoize(key)
       if memoized?(key)
@@ -32,4 +36,32 @@ module Straw
       "@#{key}"
     end
   end
+
+  class Tracer
+    def initialize(logger)
+      @logger = logger
+    end
+
+    def trace(defaults = {})
+      tracer = TracePoint.new(:call) do |x|
+        @logger.debug(defaults.merge({ path: x.path, lineno: x.lineno, clazz: x.defined_class, method: x.method_id, args: args_from(x), locals: locals_from(x) }))
+      rescue StandardError => boom
+        @logger.error(defaults.merge({ message: boom.message, stacktrace: boom.backtrace }))
+      end
+      tracer.enable
+      yield
+    ensure
+      tracer.disable
+    end
+
+    private
+
+    def args_from(trace)
+      trace.parameters.map(&:last).map { |x| [x, trace.binding.eval(x.to_s)] }.to_h
+    end
+
+    def locals_from(trace)
+      trace.binding.local_variables.map { |x| [x, trace.binding.local_variable_get(x)] }.to_h
+    end
+  end
 end