lib/skylight/messages/trace.rb in skylight-0.1.4.alpha1 vs lib/skylight/messages/trace.rb in skylight-0.1.4.alpha2

@@ -25,10 +25,13 @@
           @config   = config
           @start    = start
           @spans    = []
           @stack    = []
           @parents  = []
+
+          # Track time
+          @last_seen_time = start
         end
 
         def root(cat, title = nil, desc = nil, annot = {})
           return unless block_given?
           return yield unless @stack == []
@@ -64,10 +67,12 @@
         end
 
         def record(time, cat, title = nil, desc = nil, annot = {})
           return if @busted
 
+          track_time(time)
+
           sp = span(time, cat, title, desc, annot)
 
           return self if :skip == sp
 
           inc_children
@@ -77,20 +82,24 @@
         end
 
         def start(time, cat, title = nil, desc = nil, annot = {})
           return if @busted
 
+          track_time(time)
+
           sp = span(time, cat, title, desc, annot)
 
           push(sp)
 
           self
         end
 
         def stop(time)
           return if @busted
 
+          track_time(time)
+
           sp = pop
 
           return self if :skip == sp
 
           sp.duration = relativize(time) - sp.started_at
@@ -173,9 +182,20 @@
           if parent = @parents[-1]
             ((time - parent.absolute_time) / 100).to_i
           else
             ((time - @start) / 100).to_i
           end
+        end
+
+        def track_time(time)
+          if time < @last_seen_time
+            @busted = true
+            raise TraceError, "time moving backwards; " \
+              "prev=#{@last_seen_time}; " \
+              "curr=#{time}"
+          end
+
+          @last_seen_time = time
         end
 
       end
 
     end