fix(gevent): don't forget to call activate hooks on span activation (#2605) (#2607)

(cherry picked from commit 232fc4a)

Co-authored-by: Julien Danjou <[email protected]>

Author: mergify[bot]

ddtrace/contrib/gevent/provider.py

@@ -30,6 +30,7 @@ def activate(self, context):
         current_g = gevent.getcurrent()
         if current_g is not None:
             setattr(current_g, self._CONTEXT_ATTR, context)
+            super(GeventContextProvider, self).activate(context)
             return context
 
     def active(self):

tests/contrib/gevent/test_provider.py

@@ -0,0 +1,15 @@
+from ddtrace.contrib.gevent import provider
+
+
+def test_call_hooks(tracer):
+    data = {}
+
+    def record(context):
+        if "trace" not in data:
+            data["trace"] = context
+
+    tracer.configure(context_provider=provider.GeventContextProvider())
+    tracer.context_provider._on_activate(record)
+    with tracer.trace("test123") as mytrace:
+        pass
+    assert data["trace"] is mytrace