Merge pull request #1623 from sever-sever/T4771

T4771: Ability to get raw format for op-mode BGP commands

1 files changed, 120 insertions, 0 deletions

diff --git a/src/op_mode/bgp.py b/src/op_mode/bgp.py
new file mode 100755
index 000000000..23001a9d7
--- /dev/null
+++ b/src/op_mode/bgp.py
@@ -0,0 +1,120 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2022 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/>.
+#
+# Purpose:
+#    Displays bgp neighbors information.
+#    Used by the "show bgp (vrf <tag>) ipv4|ipv6 neighbors" commands.
+
+import re
+import sys
+import typing
+
+import jmespath
+from jinja2 import Template
+from humps import decamelize
+
+from vyos.configquery import ConfigTreeQuery
+
+import vyos.opmode
+
+
+frr_command_template = Template("""
+{% if family %}
+    show bgp
+        {{ 'vrf ' ~ vrf if vrf else '' }}
+        {{ 'ipv6' if family == 'inet6' else 'ipv4'}}
+        {{ 'neighbor ' ~ peer if peer else 'summary' }}
+{% endif %}
+
+{% if raw %}
+    json
+{% endif %}
+""")
+
+
+def _verify(func):
+    """Decorator checks if BGP config exists
+    BGP configuration can be present under vrf <tag>
+    If we do npt get arg 'peer' then it can be 'bgp summary'
+    """
+    from functools import wraps
+
+    @wraps(func)
+    def _wrapper(*args, **kwargs):
+        config = ConfigTreeQuery()
+        afi = 'ipv6' if kwargs.get('family') == 'inet6' else 'ipv4'
+        global_vrfs = ['all', 'default']
+        peer = kwargs.get('peer')
+        vrf = kwargs.get('vrf')
+        unconf_message = f'BGP or neighbor is not configured'
+        # Add option to check the specific neighbor if we have arg 'peer'
+        peer_opt = f'neighbor {peer} address-family {afi}-unicast' if peer else ''
+        vrf_opt = ''
+        if vrf and vrf not in global_vrfs:
+            vrf_opt = f'vrf name {vrf}'
+        # Check if config does not exist
+        if not config.exists(f'{vrf_opt} protocols bgp {peer_opt}'):
+            raise vyos.opmode.UnconfiguredSubsystem(unconf_message)
+        return func(*args, **kwargs)
+
+    return _wrapper
+
+
+@_verify
+def show_neighbors(raw: bool,
+                   family: str,
+                   peer: typing.Optional[str],
+                   vrf: typing.Optional[str]):
+    kwargs = dict(locals())
+    frr_command = frr_command_template.render(kwargs)
+    frr_command = re.sub(r'\s+', ' ', frr_command)
+
+    from vyos.util import cmd
+    output = cmd(f"vtysh -c '{frr_command}'")
+
+    if raw:
+        from json import loads
+        data = loads(output)
+        # Get list of the peers
+        peers = jmespath.search('*.peers | [0]', data)
+        if peers:
+            # Create new dict, delete old key 'peers'
+            # add key 'peers' neighbors to the list
+            list_peers = []
+            new_dict = jmespath.search('* | [0]', data)
+            if 'peers' in new_dict:
+                new_dict.pop('peers')
+
+                for neighbor, neighbor_options in peers.items():
+                    neighbor_options['neighbor'] = neighbor
+                    list_peers.append(neighbor_options)
+                new_dict['peers'] = list_peers
+            return decamelize(new_dict)
+        data = jmespath.search('* | [0]', data)
+        return decamelize(data)
+
+    else:
+        return output
+
+
+if __name__ == '__main__':
+    try:
+        res = vyos.opmode.run(sys.modules[__name__])
+        if res:
+            print(res)
+    except (ValueError, vyos.opmode.Error) as e:
+        print(e)
+        sys.exit(1)