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author | 2021-01-21 20:11:26 +0530 | |
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committer | 2021-01-21 21:39:49 +0530 | |
commit | def30df55e27fd1eccbcda7a19f6d7f1ef9004a8 (patch) | |
tree | 76141afb7bc93efd2b5857ed36d66604a3ac6c63 /plans/usecases-config-over-netconf/config-over-netconf/netconf-pnp-simulator/netconf-config/subscriber.py | |
parent | ef3d76ba5ad5210f8405fcfffac191a08f6b5cba (diff) |
Fixed Config-Over-Netconf CSIT
- Added Netconf-Pnp-Simulator
- Fix, updated Config-Over-Netconf csit
Issue-ID: INT-1835
Signed-off-by: ajay_dp001 <ajay.deep.singh@est.tech>
Change-Id: Idb769fc027acfa24f82caaa27209d9f3f4084249
Diffstat (limited to 'plans/usecases-config-over-netconf/config-over-netconf/netconf-pnp-simulator/netconf-config/subscriber.py')
-rwxr-xr-x | plans/usecases-config-over-netconf/config-over-netconf/netconf-pnp-simulator/netconf-config/subscriber.py | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/plans/usecases-config-over-netconf/config-over-netconf/netconf-pnp-simulator/netconf-config/subscriber.py b/plans/usecases-config-over-netconf/config-over-netconf/netconf-pnp-simulator/netconf-config/subscriber.py new file mode 100755 index 00000000..61272967 --- /dev/null +++ b/plans/usecases-config-over-netconf/config-over-netconf/netconf-pnp-simulator/netconf-config/subscriber.py @@ -0,0 +1,136 @@ +#!/usr/bin/env python3 + +__author__ = "Mislav Novakovic <mislav.novakovic@sartura.hr>" +__copyright__ = "Copyright 2018, Deutsche Telekom AG" +__license__ = "Apache 2.0" + +# 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. + +# This sample application demonstrates use of Python programming language bindings for sysrepo library. +# Original c application was rewritten in Python to show similarities and differences +# between the two. +# +# Most notable difference is in the very different nature of languages, c is weakly statically typed language +# while Python is strongly dynamically typed. Python code is much easier to read and logic easier to comprehend +# for smaller scripts. Memory safety is not an issue but lower performance can be expected. +# +# The original c implementation is also available in the source, so one can refer to it to evaluate trade-offs. + +import sysrepo as sr +import sys + + +# Helper function for printing changes given operation, old and new value. +def print_change(op, old_val, new_val): + if op == sr.SR_OP_CREATED: + print(f"CREATED: {new_val.to_string()}") + elif op == sr.SR_OP_DELETED: + print(f"DELETED: {old_val.to_string()}") + elif op == sr.SR_OP_MODIFIED: + print(f"MODIFIED: {old_val.to_string()} to {new_val.to_string()}") + elif op == sr.SR_OP_MOVED: + print(f"MOVED: {new_val.xpath()} after {old_val.xpath()}") + + +# Helper function for printing events. +def ev_to_str(ev): + if ev == sr.SR_EV_VERIFY: + return "verify" + elif ev == sr.SR_EV_APPLY: + return "apply" + elif ev == sr.SR_EV_ABORT: + return "abort" + else: + return "unknown" + + +# Function to print current configuration state. +# It does so by loading all the items of a session and printing them out. +def print_current_config(session, module_name): + select_xpath = f"/{module_name}:*//*" + + values = session.get_items(select_xpath) + + if values is not None: + print("========== BEGIN CONFIG ==========") + for i in range(values.val_cnt()): + print(values.val(i).to_string(), end='') + print("=========== END CONFIG ===========") + + +# Function to be called for subscribed client of given session whenever configuration changes. +def module_change_cb(sess, module_name, event, private_ctx): + try: + print("========== Notification " + ev_to_str(event) + " =============================================") + if event == sr.SR_EV_APPLY: + print_current_config(sess, module_name) + + print("========== CHANGES: =============================================") + + change_path = f"/{module_name}:*" + + it = sess.get_changes_iter(change_path) + + while True: + change = sess.get_change_next(it) + if change is None: + break + print_change(change.oper(), change.old_val(), change.new_val()) + + print("========== END OF CHANGES =======================================") + except Exception as e: + print(e) + + return sr.SR_ERR_OK + + +def main(): + # Notable difference between c implementation is using exception mechanism for open handling unexpected events. + # Here it is useful because `Connection`, `Session` and `Subscribe` could throw an exception. + try: + module_name = "ietf-interfaces" + if len(sys.argv) > 1: + module_name = sys.argv[1] + else: + print("\nYou can pass the module name to be subscribed as the first argument") + + print(f"Application will watch for changes in {module_name}") + + # connect to sysrepo + conn = sr.Connection(module_name) + + # start session + sess = sr.Session(conn) + + # subscribe for changes in running config */ + subscribe = sr.Subscribe(sess) + + subscribe.module_change_subscribe(module_name, module_change_cb) + + try: + print_current_config(sess, module_name) + except Exception as e: + print(e) + + print("========== STARTUP CONFIG APPLIED AS RUNNING ==========") + + sr.global_loop() + + print("Application exit requested, exiting.") + + except Exception as e: + print(e) + + +if __name__ == '__main__': + main() |