djangoware sampling patch diff

gistfile1.diff

dan@ponderous:~/code/oboeware $ git diff
diff --git a/oboeware/djangoware.py b/oboeware/djangoware.py
index ae1d0aa..2c56c02 100644
--- a/oboeware/djangoware.py
+++ b/oboeware/djangoware.py
@@ -41,13 +41,15 @@ class OboeDjangoMiddleware(object):
 
     def process_request(self, request):
         import oboe
+        import random
         xtr_hdr = request.META.get("HTTP_X-Trace", request.META.get("HTTP_X_TRACE"))
         tracing_mode = oboe.config.get('tracing_mode')
+        sample_rate = oboe.config.get('sample_rate')
 
         if not oboe.Context.isValid() and xtr_hdr and tracing_mode in ['always', 'through']:
             oboe.Context.fromString(xtr_hdr)
 
-        if not oboe.Context.isValid() and tracing_mode == "always":
+        if not oboe.Context.isValid() and tracing_mode == "always" and random.random() < sample_rate:
             evt = oboe.Context.startTrace()
         elif oboe.Context.isValid() and tracing_mode != 'never':
             evt = oboe.Context.createEvent()
dan@ponderous:~/code/oboeware $