Add token deletion in Client destructor

Signed-off-by: Olivier Léobal <olivier.leobal@owkin.com>

CHANGELOG.md

@@ -12,10 +12,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `wait_completion` param on `get_performances`, `list_task_output_assets` and `get_task_output_asset` to block execution until execution is over ([#368](https://github.com/Substra/substra/pull/368))
 - `list_task_output_assets` and `get_task_output_asset` wait that the compute task is over before getting assets ([#369](https://github.com/Substra/substra/pull/369))
 - warning and help message when logging in with username/password rather than token ([#378](https://github.com/Substra/substra/pull/378))
+- new `Client.logout` function, mirrorring `Client.login` ([#381](https://github.com/Substra/substra/pull/381))
+- `Client` can now be the expression in a `with` statement ([#381](https://github.com/Substra/substra/pull/381))
 
 ### Changed
 
 - change how API responses are parsed to match server changes ([#379](https://github.com/Substra/substra/pull/379))
+- `Client` will now terminate the sessions it starts when given username & password ([#381](https://github.com/Substra/substra/pull/381))
 
 ### Fixed
 

substra/sdk/backends/remote/rest_client.py

@@ -112,13 +112,13 @@ def login(self, username, password):
 
     def logout(self) -> None:
         if not self._token_id:
-            logger.debug("Logging out has no effect (did not call Client.login)")
             return
         try:
             r = requests.delete(
                 f"{self._base_url}/active-api-tokens/", params={"id": self._token_id}, headers=self._headers
             )
             r.raise_for_status()
+            self._token_id = None
             logger.info("Successfully logged out")
         except requests.exceptions.ConnectionError as e:
             raise exceptions.ConnectionError.from_request_exception(e)

substra/sdk/client.py

@@ -312,11 +312,12 @@ def __init__(
             self._token = self.login(config_dict["username"].value, config_dict["password"].value)
 
     def __enter__(self):
-        # for use in a `with` statement
         return self
 
     def __exit__(self, exc_type, exc_value, traceback):
-        # for use in a `with` statement
+        self.logout()
+
+    def __del__(self):
         self.logout()
 
     def _get_backend(self, backend_type: schemas.BackendType):
@@ -381,6 +382,7 @@ def login(self, username, password):
     def logout(self) -> None:
         """
         Log out from a remote server, if Client.login was used
+        (otherwise, nothing happens)
         """
         if not self._backend:
             raise exceptions.SDKException("No backend found")