pppoe-server: T6234: PPPoE-server pado-delay refactoring

(cherry picked from commit 107ee099e82397b31fca8cf1ac3860cbf76f0596)

2 files changed, 73 insertions, 0 deletions

diff --git a/src/conf_mode/service_pppoe-server.py b/src/conf_mode/service_pppoe-server.py
index 328487985..c95f976d3 100755
--- a/src/conf_mode/service_pppoe-server.py
+++ b/src/conf_mode/service_pppoe-server.py
@@ -84,12 +84,29 @@ def verify_pado_delay(pppoe):
         pado_delay = pppoe['pado_delay']
 
         delays_without_sessions = pado_delay['delays_without_sessions']
+        if 'disable' in delays_without_sessions:
+            raise ConfigError(
+                'Number of sessions must be specified for "pado-delay disable"'
+            )
+
         if len(delays_without_sessions) > 1:
             raise ConfigError(
                 f'Cannot add more then ONE pado-delay without sessions, '
                 f'but {len(delays_without_sessions)} were set'
             )
 
+        if 'disable' in [delay[0] for delay in pado_delay['delays_with_sessions']]:
+            # need to sort delays by sessions to verify if there is no delay
+            # for sessions after disabling
+            sorted_pado_delay = sorted(pado_delay['delays_with_sessions'], key=lambda k_v: k_v[1])
+            last_delay = sorted_pado_delay[-1]
+
+            if last_delay[0] != 'disable':
+                raise ConfigError(
+                    f'Cannot add pado-delay after disabled sessions, but '
+                    f'"pado-delay {last_delay[0]} sessions {last_delay[1]}" was set'
+                )
+
 def verify(pppoe):
     if not pppoe:
         return None
diff --git a/src/migration-scripts/pppoe-server/9-to-10 b/src/migration-scripts/pppoe-server/9-to-10
new file mode 100644
index 000000000..e0c782f04
--- /dev/null
+++ b/src/migration-scripts/pppoe-server/9-to-10
@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2024 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/>.
+
+# Migration of pado-delay options
+
+from sys import argv
+from sys import exit
+from vyos.configtree import ConfigTree
+
+if len(argv) < 2:
+    print("Must specify file name!")
+    exit(1)
+
+file_name = argv[1]
+
+with open(file_name, 'r') as f:
+    config_file = f.read()
+
+config = ConfigTree(config_file)
+base = ['service', 'pppoe-server', 'pado-delay']
+if not config.exists(base):
+    exit(0)
+
+pado_delay = {}
+for delay in config.list_nodes(base):
+    sessions = config.return_value(base + [delay, 'sessions'])
+    pado_delay[delay] = sessions
+
+# need to define delay for latest sessions
+sorted_delays = dict(sorted(pado_delay.items(), key=lambda k_v: int(k_v[1])))
+last_delay = list(sorted_delays)[-1]
+
+# Rename last delay -> disable
+tmp = base + [last_delay]
+if config.exists(tmp):
+    config.rename(tmp, 'disable')
+
+try:
+    with open(file_name, 'w') as f:
+        f.write(config.to_string())
+except OSError as e:
+    print("Failed to save the modified config: {}".format(e))
+    exit(1)