Populate the DRIVER_CONFIG report - phase 2

CHANGELOG.rst

@@ -14,6 +14,15 @@ Features
   ``Cluster(driver_config_reporting_enabled=False)``; ``SESSION_ID`` is unaffected by
   that setting. Reporting is best effort and never prevents a connection from being
   established.
+* ``DRIVER_CONFIG`` now describes the configuration itself rather than only the schema
+  version it follows (DRIVER-379). The report covers connection settings (timeouts,
+  request capacity, shard awareness, socket options, reconnection policy, TLS hostname
+  verification), the driver's own control-plane query timeouts, and the query defaults
+  and policies of the default execution profile. It follows the JSON schema shared with
+  the other ScyllaDB drivers, so the same document describes a client whichever driver
+  wrote it. Custom policies are reported by type name only and never by their
+  attributes, so a policy holding a credential does not leak it into the clients
+  table.
 * Negotiate and implement the ``SCYLLA_USE_METADATA_ID`` protocol extension: prepared
   statements skip re-sending result metadata on EXECUTE, and the driver automatically
   refreshes cached metadata when the server detects a schema change (DRIVER-153)

cassandra/cluster.py

@@ -1520,7 +1520,7 @@ def __init__(self,
         # Built whatever the flag says, so that the flag is the only thing that
         # decides whether a connection reports: see _make_connection_kwargs. The
         # reporter holds no state, so an unused one costs nothing.
-        self._driver_config_reporter = DriverConfigReporter()
+        self._driver_config_reporter = DriverConfigReporter(self)
 
         self.control_connection = ControlConnection(
             self, self.control_connection_timeout,

cassandra/connection.py

@@ -1563,7 +1563,13 @@ def _handle_options_response(self, options_response):
         # only the control connection reports it. A reporter left as None means
         # the cluster has configuration reporting disabled.
         if self.is_control_connection and self._driver_config_reporter is not None:
-            self._driver_config_reporter.add_startup_options(options)
+            # Whether this is a ScyllaDB node is already known: the features
+            # above were parsed from the SUPPORTED response, and sharding info
+            # is what the driver itself keys ScyllaDB-only behaviour off (see
+            # ControlConnection._try_connect), so the report describes what the
+            # driver will actually do rather than only what it was configured to.
+            self._driver_config_reporter.add_startup_options(
+                options, is_scylla=self.features.sharding_info is not None)
 
         if self.cql_version:
             if self.cql_version not in supported_cql_versions: