Fix traces (#630)

* Fix traces

current_trace_context isn't in the top module. Let's use it from the
right place, and make sure it raises an error in CI next time it happens

* Enforce CI check  with RECORD

Author: therve

.github/workflows/test_integration.yml

@@ -63,7 +63,6 @@ jobs:
         run: ./run-tests.sh
         shell: bash
         env:
-          CI: "true"
           DD_AGENT_HOST: localhost
           DD_ENV: prod
           DD_SERVICE: datadog-api-client-python

tests/conftest.py

@@ -6,7 +6,7 @@
 # First patch httplib
 tracer = None
 try:
-    from ddtrace import config, current_trace_context, patch, tracer
+    from ddtrace import config, patch, tracer
 
     if os.getenv("RECORD", "false") != "none":
         from ddtrace.internal.writer import AgentWriter
@@ -44,7 +44,8 @@ def pytest_terminal_summary(terminalreporter, exitstatus, config):
 
 
 except ImportError:
-    pass
+    if os.getenv("CI", "false") == "true" and os.getenv("RECORD", "false") == "none":
+        raise
 
 import importlib
 import json
@@ -87,7 +88,7 @@ def pytest_bdd_before_step(request, feature, scenario, step, step_func):
         step.type,
         resource=step.name,
         span_type=step.type,
-        child_of=current_trace_context(),
+        child_of=tracer.current_trace_context(),
     )
     setattr(step_func, "__dd_span__", span)