[PATCH v7 7/9] dts: add node base class

["Juraj Linkeš" <juraj.linkes@pantheon.tech>]

The base class implements basic node management methods - connect and
execute commands.

Signed-off-by: Owen Hilyard <ohilyard@iol.unh.edu>
Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>
---
 dts/framework/testbed_model/__init__.py |  7 +++
 dts/framework/testbed_model/node.py     | 62 +++++++++++++++++++++++++
 2 files changed, 69 insertions(+)
 create mode 100644 dts/framework/testbed_model/__init__.py
 create mode 100644 dts/framework/testbed_model/node.py

diff --git a/dts/framework/testbed_model/__init__.py b/dts/framework/testbed_model/__init__.py
new file mode 100644
index 0000000000..c5512e5812
--- /dev/null
+++ b/dts/framework/testbed_model/__init__.py
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2022 University of New Hampshire
+
+"""
+This module contains the classes used to model the physical traffic generator,
+system under test and any other components that need to be interacted with.
+"""
diff --git a/dts/framework/testbed_model/node.py b/dts/framework/testbed_model/node.py
new file mode 100644
index 0000000000..8437975416
--- /dev/null
+++ b/dts/framework/testbed_model/node.py
@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2010-2014 Intel Corporation
+# Copyright(c) 2022 PANTHEON.tech s.r.o.
+# Copyright(c) 2022 University of New Hampshire
+
+"""
+A node is a generic host that DTS connects to and manages.
+"""
+
+from framework.config import NodeConfiguration
+from framework.logger import DTSLOG, getLogger
+from framework.remote_session import RemoteSession, create_remote_session
+from framework.settings import SETTINGS
+
+
+class Node(object):
+    """
+    Basic module for node management. This module implements methods that
+    manage a node, such as information gathering (of CPU/PCI/NIC) and
+    environment setup.
+    """
+
+    name: str
+    main_session: RemoteSession
+    logger: DTSLOG
+    _config: NodeConfiguration
+    _other_sessions: list[RemoteSession]
+
+    def __init__(self, node_config: NodeConfiguration):
+        self._config = node_config
+        self._other_sessions = []
+
+        self.name = node_config.name
+        self.logger = getLogger(self.name)
+        self.logger.info(f"Created node: {self.name}")
+        self.main_session = create_remote_session(self._config, self.name, self.logger)
+
+    def send_command(self, cmds: str, timeout: float = SETTINGS.timeout) -> str:
+        """
+        Send commands to node and return string before timeout.
+        """
+
+        return self.main_session.send_command(cmds, timeout)
+
+    def create_session(self, name: str) -> RemoteSession:
+        connection = create_remote_session(
+            self._config,
+            name,
+            getLogger(name, node=self.name),
+        )
+        self._other_sessions.append(connection)
+        return connection
+
+    def node_exit(self) -> None:
+        """
+        Recover all resource before node exit
+        """
+        if self.main_session:
+            self.main_session.close()
+        for session in self._other_sessions:
+            session.close()
+        self.logger.logger_exit()
-- 
2.30.2