Allow closing underlying requests session

Also allows the use of with statement for automatic
close.

Author: fqqb

yamcs-client/src/yamcs/client/core.py

@@ -214,6 +214,12 @@ def from_environment():
 
         return YamcsClient(url, credentials=credentials)
 
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.close()
+
     def get_time(self, instance) -> Optional[datetime.datetime]:
         """
         Return the current mission time for the specified instance.
@@ -735,3 +741,7 @@ def create_event_subscription(
         subscription.reply(timeout=timeout)
 
         return subscription
+
+    def close(self):
+        """Close this client session"""
+        self.ctx.close()

yamcs-client/src/yamcs/core/context.py

@@ -118,3 +118,7 @@ def request(self, method: str, path: str, **kwargs) -> requests.Response:
             raise YamcsError(f"{response.status_code} Client Error: {msg}")
         msg = getattr(exception_message, "msg")
         raise YamcsError(f"{response.status_code} Server Error: {msg}")
+
+    def close(self):
+        """Close this context"""
+        self.session.close()