Added none value for OTEL_PROPAGATORS

Author: Annosha

opentelemetry-api/src/opentelemetry/propagate/__init__.py

@@ -130,28 +130,31 @@ def inject(
 )
 
 
-for propagator in environ_propagators.split(","):
-    propagator = propagator.strip()
-
-    try:
-
-        propagators.append(  # type: ignore
-            next(  # type: ignore
-                iter(  # type: ignore
-                    entry_points(  # type: ignore
-                        group="opentelemetry_propagator",
-                        name=propagator,
+if environ_propagators.lower() == "none":
+    propagators = []
+else:
+    for propagator in environ_propagators.split(","):
+        propagator = propagator.strip()
+
+        try:
+
+            propagators.append(  # type: ignore
+                next(  # type: ignore
+                    iter(  # type: ignore
+                        entry_points(  # type: ignore
+                            group="opentelemetry_propagator",
+                            name=propagator,
+                        )
                     )
-                )
-            ).load()()
-        )
-    except StopIteration:
-        raise ValueError(
-            f"Propagator {propagator} not found. It is either misspelled or not installed."
-        )
-    except Exception:  # pylint: disable=broad-exception-caught
-        logger.exception("Failed to load propagator: %s", propagator)
-        raise
+                ).load()()
+            )
+        except StopIteration:
+            raise ValueError(
+                f"Propagator {propagator} not found. It is either misspelled or not installed."
+            )
+        except Exception:  # pylint: disable=broad-exception-caught
+            logger.exception("Failed to load propagator: %s", propagator)
+            raise
 
 
 _HTTP_TEXT_FORMAT = composite.CompositePropagator(propagators)  # type: ignore

opentelemetry-api/tests/propagators/test_propagators.py

@@ -50,6 +50,24 @@ def test_propagators(propagators):
 
         reload(opentelemetry.propagate)
 
+    @patch.dict(environ, {OTEL_PROPAGATORS: "none"})
+    @patch("opentelemetry.propagators.composite.CompositePropagator")
+    def test_no_propagators_loaded(self, mock_compositehttppropagator):
+        def test_propagators(propagators):
+            self.assertEqual(
+                propagators, []
+            )  # Expecting an empty list of propagators
+
+        mock_compositehttppropagator.configure_mock(
+            **{"side_effect": test_propagators}
+        )
+
+        from importlib import reload
+
+        import opentelemetry.propagate
+
+        reload(opentelemetry.propagate)
+
     @patch.dict(environ, {OTEL_PROPAGATORS: "a,  b,   c  "})
     @patch("opentelemetry.propagators.composite.CompositePropagator")
     @patch("opentelemetry.util._importlib_metadata.entry_points")