Create python application for config change subscription.

Signed-off-by: Bartosz Gardziejewski <bartosz.gardziejewski@nokia.com>
Change-Id: I690a188d155bed70f799ef1c6b947c9ecb1a5f47
Issue-ID: INT-1869

25 files changed, 794 insertions, 0 deletions

diff --git a/src/python/README.md b/src/python/README.md
new file mode 100644
index 0000000..90906c6
--- /dev/null
+++ b/src/python/README.md
@@ -0,0 +1,17 @@
+# Netconf Server Python Application
+This application is providing core Netconf Server capabilities.
+It is started in detached mode on image startup.
+
+Application capabilities:
+ - Subscribing on config change per model.
+   - Models to subscribe to are loaded from configuration file, 
+     provided as application parameter.
+   - When configuration of one of models change
+     information about change are logged 
+
+
+## Testing
+Tox file with pytest are used fo testing. 
+
+## Logging
+Application prints logs on to the console and to file `/logs/netconf_saver.log`
diff --git a/src/python/netconf_server/__init__.py b/src/python/netconf_server/__init__.py
new file mode 100644
index 0000000..eeb06d5
--- /dev/null
+++ b/src/python/netconf_server/__init__.py
@@ -0,0 +1,19 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
diff --git a/src/python/netconf_server/netconf_server.py b/src/python/netconf_server/netconf_server.py
new file mode 100644
index 0000000..b790604
--- /dev/null
+++ b/src/python/netconf_server/netconf_server.py
@@ -0,0 +1,39 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+import logging
+
+from netconf_server.sysrepo_interface.config_change_data import ConfigChangeData
+
+logger = logging.getLogger("netconf_saver")
+
+
+class NetconfServer(object):
+
+    def __init__(self, subscriptions: list):
+        self.subscriptions = subscriptions
+
+    def run(self, session):
+        for subscription in self.subscriptions:
+            subscription.callback_function = self.__on_module_configuration_change
+            subscription.subscribe_on_model_change(session)
+
+    @staticmethod
+    def __on_module_configuration_change(config_change_data: ConfigChangeData):
+        logger.info("Received module changed: %s , %s " % (config_change_data.event, config_change_data.changes))
diff --git a/src/python/netconf_server/netconf_server_factory.py b/src/python/netconf_server/netconf_server_factory.py
new file mode 100644
index 0000000..28297ad
--- /dev/null
+++ b/src/python/netconf_server/netconf_server_factory.py
@@ -0,0 +1,40 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+import logging
+
+from netconf_server.netconf_server import NetconfServer
+from netconf_server.sysrepo_interface.config_change_subscriber import ConfigChangeSubscriber
+
+logger = logging.getLogger("netconf_saver")
+
+
+class NetconfServerFactory(object):
+
+    def __init__(self, modules_to_subscribe_names: list):
+        self.modules_to_subscribe_names = modules_to_subscribe_names
+
+    def create(self) -> NetconfServer:
+        subscriptions = list()
+        for module_name in self.modules_to_subscribe_names:
+            subscriptions.append(
+                ConfigChangeSubscriber(module_name)
+            )
+        return NetconfServer(subscriptions)
+
diff --git a/src/python/netconf_server/sysrepo_configuration/__init__.py b/src/python/netconf_server/sysrepo_configuration/__init__.py
new file mode 100644
index 0000000..eeb06d5
--- /dev/null
+++ b/src/python/netconf_server/sysrepo_configuration/__init__.py
@@ -0,0 +1,19 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
diff --git a/src/python/netconf_server/sysrepo_configuration/sysrepo_configuration.py b/src/python/netconf_server/sysrepo_configuration/sysrepo_configuration.py
new file mode 100644
index 0000000..fa48098
--- /dev/null
+++ b/src/python/netconf_server/sysrepo_configuration/sysrepo_configuration.py
@@ -0,0 +1,24 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+
+class SysrepoConfiguration(object):
+
+    def __init__(self, models_to_subscribe_to: list):
+        self.models_to_subscribe_to = models_to_subscribe_to
diff --git a/src/python/netconf_server/sysrepo_configuration/sysrepo_configuration_loader.py b/src/python/netconf_server/sysrepo_configuration/sysrepo_configuration_loader.py
new file mode 100644
index 0000000..dc7ac90
--- /dev/null
+++ b/src/python/netconf_server/sysrepo_configuration/sysrepo_configuration_loader.py
@@ -0,0 +1,58 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+
+import logging
+import os
+from configparser import ConfigParser
+
+from netconf_server.sysrepo_configuration.sysrepo_configuration import SysrepoConfiguration
+
+MODELS_LIST_TAG = "models"
+SUBSCRIPTION_TAG = "SUBSCRIPTION"
+
+logger = logging.getLogger("sysrep_configuration_loader")
+
+
+class SysrepoConfigurationLoader(object):
+
+    # configuration_file must be in .ini format
+    @staticmethod
+    def load_configuration(configuration_file: str) -> SysrepoConfiguration:
+        if os.path.isfile(configuration_file):
+            config_object = ConfigParser()
+            config_object.read(configuration_file)
+            if SUBSCRIPTION_TAG in config_object and MODELS_LIST_TAG in config_object[SUBSCRIPTION_TAG]:
+                logger.info("Loading configuration from file %s" % configuration_file)
+                models_to_subscribe_to = config_object[SUBSCRIPTION_TAG][MODELS_LIST_TAG].split(",")
+                return SysrepoConfiguration(models_to_subscribe_to)
+            else:
+                logger.warning("Loading configuration failed, %s is not valid configuration file" % configuration_file)
+                raise ConfigLoadingException(
+                    "Loading sysrepo configuration have failed, %s is not correct config file" % configuration_file
+                )
+        else:
+            logger.warning("Loading configuration failed, %s does not exist or is not a file" % configuration_file)
+            raise ConfigLoadingException(
+                "Loading sysrepo configuration have failed, %s is not valid file" % configuration_file
+            )
+
+
+class ConfigLoadingException(Exception):
+    pass
diff --git a/src/python/netconf_server/sysrepo_interface/__init__.py b/src/python/netconf_server/sysrepo_interface/__init__.py
new file mode 100644
index 0000000..eeb06d5
--- /dev/null
+++ b/src/python/netconf_server/sysrepo_interface/__init__.py
@@ -0,0 +1,19 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
diff --git a/src/python/netconf_server/sysrepo_interface/config_change_data.py b/src/python/netconf_server/sysrepo_interface/config_change_data.py
new file mode 100644
index 0000000..8e329b5
--- /dev/null
+++ b/src/python/netconf_server/sysrepo_interface/config_change_data.py
@@ -0,0 +1,28 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+
+class ConfigChangeData(object):
+
+    def __init__(self, event: str, req_id: int, changes: list):
+        self.event = event
+        self.req_id = req_id
+        self.changes = changes
+
+
diff --git a/src/python/netconf_server/sysrepo_interface/config_change_subscriber.py b/src/python/netconf_server/sysrepo_interface/config_change_subscriber.py
new file mode 100644
index 0000000..faa8254
--- /dev/null
+++ b/src/python/netconf_server/sysrepo_interface/config_change_subscriber.py
@@ -0,0 +1,49 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+
+import logging
+
+from netconf_server.sysrepo_interface.config_change_data import ConfigChangeData
+
+logger = logging.getLogger("sysrep_config_change_subscriber")
+
+
+class ConfigChangeSubscriber(object):
+
+    def __init__(self, module_name: str, callback_function: callable = None):
+        self.module_name = module_name
+        if callback_function is None:
+            self.callback_function = self.default_callback
+        else:
+            self.callback_function = callback_function
+
+    def subscribe_on_model_change(self, session):
+        logger.info("Subscribing on config change for module %s" % self.module_name)
+        session.subscribe_module_change(
+            self.module_name, None, self.on_module_have_changed, asyncio_register=True
+        )
+
+    async def on_module_have_changed(self, event: str, req_id: int, changes: list, private_data: any):
+        logger.debug("Module changed: %s (request ID %s)" % (event, req_id))
+        self.callback_function(ConfigChangeData(event, req_id, changes))
+
+    @staticmethod
+    def default_callback(config_change_data: ConfigChangeData):
+        logger.info("Received module changed: %s , %s " % (config_change_data.event, config_change_data.changes))
diff --git a/src/python/netconf_server/sysrepo_interface/sysrepo_client.py b/src/python/netconf_server/sysrepo_interface/sysrepo_client.py
new file mode 100644
index 0000000..fcd29e2
--- /dev/null
+++ b/src/python/netconf_server/sysrepo_interface/sysrepo_client.py
@@ -0,0 +1,29 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+import sysrepo
+
+
+class SysrepoClient(object):
+
+    @staticmethod
+    def run_in_session(method_to_run: callable, *extra_args):
+        with sysrepo.SysrepoConnection() as connection:
+            with connection.start_session() as session:
+                method_to_run(session, *extra_args)
diff --git a/src/python/netconf_server_application.py b/src/python/netconf_server_application.py
new file mode 100644
index 0000000..e112490
--- /dev/null
+++ b/src/python/netconf_server_application.py
@@ -0,0 +1,55 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+import asyncio
+import sys
+import logging
+
+from netconf_server.netconf_server import NetconfServer
+from netconf_server.netconf_server_factory import NetconfServerFactory
+from netconf_server.sysrepo_configuration.sysrepo_configuration_loader import SysrepoConfigurationLoader, \
+    ConfigLoadingException
+from netconf_server.sysrepo_interface.sysrepo_client import SysrepoClient
+
+logging.basicConfig(
+    handlers=[logging.StreamHandler(), logging.FileHandler("/logs/netconf_saver.log")],
+    level=logging.DEBUG
+)
+logger = logging.getLogger("netconf_saver")
+
+
+def run_server_forever(session, server: NetconfServer):
+    server.run(session)
+    asyncio.get_event_loop().run_forever()
+
+
+def create_configured_server() -> NetconfServer:
+    configuration = SysrepoConfigurationLoader.load_configuration(sys.argv[1])
+    return NetconfServerFactory(configuration.models_to_subscribe_to).create()
+
+
+if __name__ == "__main__":
+    if len(sys.argv) >= 2:
+        try:
+            netconf_server = create_configured_server()
+            SysrepoClient().run_in_session(run_server_forever, netconf_server)
+        except ConfigLoadingException:
+            logger.error("File to load configuration from file %s" % sys.argv[1])
+    else:
+        logger.error("Missing path to file with configuration argument required to start netconf server.")
diff --git a/src/python/requirements.txt b/src/python/requirements.txt
new file mode 100644
index 0000000..ee6c404
--- /dev/null
+++ b/src/python/requirements.txt
@@ -0,0 +1,21 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+
+sysrepo==0.4.2
diff --git a/src/python/setup.py b/src/python/setup.py
new file mode 100644
index 0000000..394143f
--- /dev/null
+++ b/src/python/setup.py
@@ -0,0 +1,32 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+import setuptools
+
+with open('requirements.txt') as f:
+    required = f.read().splitlines()
+
+setuptools.setup(
+    name="netconf-server",
+    version="1.0.0",
+    description="Application that exposes REST API for managing sysrepo",
+    packages=setuptools.find_packages(include=['netconf_server', 'netconf_server.*']),
+    classifiers=["Programming Language :: Python :: 3.6"],
+    install_requires=required
+)
diff --git a/src/python/test-requirements.txt b/src/python/test-requirements.txt
new file mode 100644
index 0000000..4c3f573
--- /dev/null
+++ b/src/python/test-requirements.txt
@@ -0,0 +1,22 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+
+pytest==6.2.2
+
diff --git a/src/python/tests/__init__.py b/src/python/tests/__init__.py
new file mode 100644
index 0000000..eeb06d5
--- /dev/null
+++ b/src/python/tests/__init__.py
@@ -0,0 +1,19 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
diff --git a/src/python/tests/mocs/__init__.py b/src/python/tests/mocs/__init__.py
new file mode 100644
index 0000000..eeb06d5
--- /dev/null
+++ b/src/python/tests/mocs/__init__.py
@@ -0,0 +1,19 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
diff --git a/src/python/tests/mocs/mocked_session.py b/src/python/tests/mocs/mocked_session.py
new file mode 100644
index 0000000..d7adb1b
--- /dev/null
+++ b/src/python/tests/mocs/mocked_session.py
@@ -0,0 +1,34 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+import asyncio
+
+
+class MockedSession(object):
+
+    def __init__(self):
+        self.__callback = None
+
+    def subscribe_module_change(self, module_name, _, on_module_have_changed, asyncio_register=True):
+        self.__callback = on_module_have_changed
+        pass
+
+    def call_config_changed(self):
+        loop = asyncio.get_event_loop()
+        loop.run_until_complete(self.__callback('event', 'req_id', 'changes', 'private_data'))
diff --git a/src/python/tests/netconf_server/__init__.py b/src/python/tests/netconf_server/__init__.py
new file mode 100644
index 0000000..eeb06d5
--- /dev/null
+++ b/src/python/tests/netconf_server/__init__.py
@@ -0,0 +1,19 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
diff --git a/src/python/tests/netconf_server/sysrepo_configuration/__init__.py b/src/python/tests/netconf_server/sysrepo_configuration/__init__.py
new file mode 100644
index 0000000..eeb06d5
--- /dev/null
+++ b/src/python/tests/netconf_server/sysrepo_configuration/__init__.py
@@ -0,0 +1,19 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
diff --git a/src/python/tests/netconf_server/sysrepo_configuration/test_sysrepo_configuration_loader.py b/src/python/tests/netconf_server/sysrepo_configuration/test_sysrepo_configuration_loader.py
new file mode 100644
index 0000000..e5462e4
--- /dev/null
+++ b/src/python/tests/netconf_server/sysrepo_configuration/test_sysrepo_configuration_loader.py
@@ -0,0 +1,84 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+import unittest
+import os
+
+from netconf_server.sysrepo_configuration.sysrepo_configuration_loader import \
+    SysrepoConfigurationLoader, ConfigLoadingException
+
+test_config_file_name = "./test-subscription-configuration.ini"
+test_config_file_content = '[SUBSCRIPTION]\nmodels = test-module,test-module-2\n'
+
+test_wrong_config_file_name = "./test-subscription-wrong-configuration.ini"
+test_wrong_config_file_content = '[SUBSCRIPTION]\n'
+
+test_non_existing_config_file_name = "./test-subscription-non-existing-configuration.ini"
+
+
+class TestSysrepoConfigurationLoader(unittest.TestCase):
+
+    def test_should_load_configuration_from_file(self):
+        # when
+        config = SysrepoConfigurationLoader.load_configuration(test_config_file_name)
+
+        # then
+        self.assertEqual(config.models_to_subscribe_to, ["test-module", "test-module-2"])
+
+    def test_should_raise_exception_if_given_configuration_file_is_wrong(self):
+        # then
+        with self.assertRaises(ConfigLoadingException):
+            # when
+            SysrepoConfigurationLoader.load_configuration(test_wrong_config_file_name)
+
+    def test_should_raise_exception_if_given_configuration_file_does_not_exist(self):
+        # then
+        with self.assertRaises(ConfigLoadingException):
+            # when
+            SysrepoConfigurationLoader.load_configuration(test_non_existing_config_file_name)
+
+    @classmethod
+    def setUpClass(cls):
+        cls.__create_configuration_file()
+        cls.__create_wrong_configuration_file()
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.__remove_configuration_files()
+        cls.__remove_wrong_configuration_files()
+
+    @staticmethod
+    def __create_configuration_file():
+        f = open(test_config_file_name, "a")
+        f.write(test_config_file_content)
+        f.close()
+
+    @staticmethod
+    def __remove_configuration_files():
+        os.remove(test_config_file_name)
+
+    @staticmethod
+    def __create_wrong_configuration_file():
+        f = open(test_wrong_config_file_name, "a")
+        f.write(test_wrong_config_file_content)
+        f.close()
+
+    @staticmethod
+    def __remove_wrong_configuration_files():
+        os.remove(test_wrong_config_file_name)
diff --git a/src/python/tests/netconf_server/sysrepo_interface/__init__.py b/src/python/tests/netconf_server/sysrepo_interface/__init__.py
new file mode 100644
index 0000000..eeb06d5
--- /dev/null
+++ b/src/python/tests/netconf_server/sysrepo_interface/__init__.py
@@ -0,0 +1,19 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
diff --git a/src/python/tests/netconf_server/sysrepo_interface/test_config_change_subscriber.py b/src/python/tests/netconf_server/sysrepo_interface/test_config_change_subscriber.py
new file mode 100644
index 0000000..9817ba4
--- /dev/null
+++ b/src/python/tests/netconf_server/sysrepo_interface/test_config_change_subscriber.py
@@ -0,0 +1,46 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+import unittest
+from unittest.mock import MagicMock
+
+from netconf_server.sysrepo_interface.config_change_data import ConfigChangeData
+from netconf_server.sysrepo_interface.config_change_subscriber import ConfigChangeSubscriber
+from tests.mocs.mocked_session import MockedSession
+
+
+class TestConfigChangeSubscriber(unittest.TestCase):
+
+    @staticmethod
+    def __test_callback(config_change_data: ConfigChangeData):
+        pass
+
+    def test_should_create_subscriber_and_call_callback_when_session_detects_change(self):
+        # given
+        self.__test_callback = MagicMock()
+        subscriber = ConfigChangeSubscriber("test", self.__test_callback)
+        session = MockedSession()
+        subscriber.subscribe_on_model_change(session)
+        self.__test_callback.assert_not_called()
+
+        # when
+        session.call_config_changed()
+
+        # then
+        self.__test_callback.assert_called_once()
diff --git a/src/python/tests/netconf_server/test_netconf_server.py b/src/python/tests/netconf_server/test_netconf_server.py
new file mode 100644
index 0000000..6306dd9
--- /dev/null
+++ b/src/python/tests/netconf_server/test_netconf_server.py
@@ -0,0 +1,53 @@
+###
+# ============LICENSE_START=======================================================
+# Netconf Server
+# ================================================================================
+# Copyright (C) 2021 Nokia. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+###
+import unittest
+from unittest.mock import MagicMock
+
+from netconf_server.netconf_server_factory import NetconfServerFactory
+from tests.mocs.mocked_session import MockedSession
+
+
+class TestNetconfServer(unittest.TestCase):
+
+    def test_should_create_and_run_netconf_server_with_one_model(self):
+        # given
+        modules_to_subscribe_names = ["test"]
+        server = NetconfServerFactory(modules_to_subscribe_names).create()
+        session = MockedSession()
+        session.subscribe_module_change = MagicMock()
+
+        # when
+        server.run(session)
+
+        # then
+        session.subscribe_module_change.assert_called_once()
+
+    def test_should_create_and_run_netconf_server_with_multiple_models(self):
+        # given
+        modules_to_subscribe_names = ["test", "test2", "test3"]
+        server = NetconfServerFactory(modules_to_subscribe_names).create()
+        session = MockedSession()
+        session.subscribe_module_change = MagicMock()
+
+        # when
+        server.run(session)
+
+        # then
+        self.assertEqual(session.subscribe_module_change.call_count, 3)
diff --git a/src/python/tox.ini b/src/python/tox.ini
new file mode 100644
index 0000000..dd76991
--- /dev/null
+++ b/src/python/tox.ini
@@ -0,0 +1,11 @@
+[tox]
+envlist = py36
+skipsdist = true
+
+[testenv]
+commands = pytest
+basepython = python3
+deps = -r test-requirements.txt
+
+[testenv:pytest]
+commands = pytest -v