From 8c125db846c8875d0401fca9283de187e28ef556 Mon Sep 17 00:00:00 2001
From: Christian Poessinger <christian@poessinger.com>
Date: Mon, 1 Jun 2020 20:17:01 +0200
Subject: bgp: T2387: proof-of-concept using get_config_dict()

---
 data/templates/frr/bgp.frr.tmpl |   1 +
 src/conf_mode/protocols_bgp.py  | 102 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 103 insertions(+)
 create mode 100644 data/templates/frr/bgp.frr.tmpl
 create mode 100755 src/conf_mode/protocols_bgp.py

diff --git a/data/templates/frr/bgp.frr.tmpl b/data/templates/frr/bgp.frr.tmpl
new file mode 100644
index 000000000..cd6f31c93
--- /dev/null
+++ b/data/templates/frr/bgp.frr.tmpl
@@ -0,0 +1 @@
+!
diff --git a/src/conf_mode/protocols_bgp.py b/src/conf_mode/protocols_bgp.py
new file mode 100755
index 000000000..3aa76d866
--- /dev/null
+++ b/src/conf_mode/protocols_bgp.py
@@ -0,0 +1,102 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2020 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import jmespath
+
+from copy import deepcopy
+from sys import exit
+
+from vyos.config import Config
+from vyos.template import render
+from vyos import ConfigError, airbag
+airbag.enable()
+
+config_file = r'/tmp/bgp.frr'
+
+default_config_data = {
+    'as_number':  ''
+}
+
+def get_config():
+    bgp = deepcopy(default_config_data)
+    conf = Config()
+
+    # this lives in the "nbgp" tree until we switch over
+    base = ['protocols', 'nbgp']
+    if not conf.exists(base):
+        return None
+
+    bgp = deepcopy(default_config_data)
+    # Get full BGP configuration as dictionary - output the configuration for development
+    #
+    # vyos@vyos# commit
+    # [ protocols nbgp 65000 ]
+    # {'nbgp': {'65000': {'address-family': {'ipv4-unicast': {'aggregate-address': {'1.1.0.0/16': {},
+    #                                                                               '2.2.2.0/24': {}}},
+    #                                        'ipv6-unicast': {'aggregate-address': {'2001:db8::/32': {}}}},
+    #                     'neighbor': {'192.0.2.1': {'password': 'foo',
+    #                                                'remote-as': '100'}}}}}
+    #
+    tmp = conf.get_config_dict(base)
+
+    # extract base key from dict as this is our AS number
+    bgp['as_number'] = jmespath.search('nbgp | keys(@) [0]', tmp)
+
+    # adjust level of dictionary returned by get_config_dict()
+    # by using jmesgpath and update dictionary
+    bgp.update(jmespath.search('nbgp.* | [0]', tmp))
+
+    from pprint import pprint
+    pprint(bgp)
+    # resulting in e.g.
+    # vyos@vyos# commit
+    # [ protocols nbgp 65000 ]
+    # {'address-family': {'ipv4-unicast': {'aggregate-address': {'1.1.0.0/16': {},
+    #                                                            '2.2.2.0/24': {}}},
+    #                     'ipv6-unicast': {'aggregate-address': {'2001:db8::/32': {}}}},
+    #  'as_number': '65000',
+    #  'neighbor': {'192.0.2.1': {'password': 'foo', 'remote-as': '100'}},
+    #  'timers': {'holdtime': '5'}}
+
+    return bgp
+
+def verify(bgp):
+    # bail out early - looks like removal from running config
+    if not bgp:
+        return None
+
+    return None
+
+def generate(bgp):
+    # bail out early - looks like removal from running config
+    if not bgp:
+        return None
+
+    render(config_file, 'frr/bgp.frr.tmpl', bgp)
+    return None
+
+def apply(bgp):
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)
-- 
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