Fix default trace options and default (#474)

Change default trace options as not to force sampling.

Author: wsabransky

contrib/opencensus-ext-jaeger/tests/test_jaeger_exporter.py

@@ -311,7 +311,7 @@ def test_translate_to_jaeger(self):
                 operationName='test1',
                 startTime=1502820146071158,
                 duration=10000000,
-                flags=1,
+                flags=0,
                 tags=[
                     jaeger.Tag(
                         key='key_bool', vType=jaeger.TagType.BOOL,

opencensus/trace/span_context.py

@@ -19,19 +19,16 @@
 import six
 import uuid
 
-from opencensus.trace import trace_options
+from opencensus.trace import trace_options as trace_options_module
 
 _INVALID_TRACE_ID = '0' * 32
 INVALID_SPAN_ID = '0' * 16
 
 TRACE_ID_PATTERN = re.compile('[0-9a-f]{32}?')
 SPAN_ID_PATTERN = re.compile('[0-9a-f]{16}?')
 
-# Default options, enable tracing
-DEFAULT_OPTIONS = 1
-
-# Default trace options
-DEFAULT = trace_options.TraceOptions(DEFAULT_OPTIONS)
+# Default options, don't force sampling
+DEFAULT_OPTIONS = '0'
 
 
 class SpanContext(object):
@@ -65,7 +62,7 @@ def __init__(
             trace_id = generate_trace_id()
 
         if trace_options is None:
-            trace_options = DEFAULT
+            trace_options = trace_options_module.TraceOptions(DEFAULT_OPTIONS)
 
         self.from_header = from_header
         self.trace_id = self._check_trace_id(trace_id)

tests/unit/trace/test_tracer.py

@@ -91,9 +91,8 @@ def test_should_sample_not_sampled(self):
 
         self.assertFalse(sampled)
 
-    def get_tracer_noop_tracer(self):
+    def test_get_tracer_noop_tracer(self):
         from opencensus.trace.tracers import noop_tracer
-
         sampler = mock.Mock()
         sampler.should_sample.return_value = False
         tracer = tracer_module.Tracer(sampler=sampler)
@@ -102,7 +101,7 @@ def get_tracer_noop_tracer(self):
 
         assert isinstance(result, noop_tracer.NoopTracer)
 
-    def get_tracer_context_tracer(self):
+    def test_get_tracer_context_tracer(self):
         from opencensus.trace.tracers import context_tracer
 
         sampler = mock.Mock()