AutoArpa: Add an optional inherit_ttl option

docs/auto_arpa.md

@@ -15,12 +15,15 @@ Alternatively the value can be a dictionary with configuration options for the A
 manager:
   auto_arpa:
     # Whether duplicate records should replace rather than error
-    # (optiona, default False)
+    # (optional, default False)
     populate_should_replace: false
     # Explicitly set the TTL of auto-created records, default is 3600s, 1hr
     ttl: 1800
     # Set how many PTR records will be created for the same IP, default: 999
     max_auto_arpa: 1
+    # Inherit the TTL value of the corresponding A/AAAA record (optional,
+    # default False)
+    inherit_ttl: True
 ```
 
 Once enabled, a singleton `AutoArpa` instance, `auto-arpa`, will be added to the pool of providers and globally configured to run as the very last global processor so that it will see all records as they will be seen by targets. Further all zones ending with `arpa.` will be held back and processed after all other zones have been completed so that all `A` and `AAAA` records will have been seen prior to planning the `arpa.` zones.

octodns/processor/arpa.py

@@ -12,19 +12,21 @@ from .base import BaseProcessor
 
 class AutoArpa(BaseProcessor):
     def __init__(
-        self, name, ttl=3600, populate_should_replace=False, max_auto_arpa=999
+        self, name, ttl=3600, populate_should_replace=False, max_auto_arpa=999, inherit_ttl=False
     ):
         super().__init__(name)
         self.log = getLogger(f'AutoArpa[{name}]')
         self.log.info(
-            '__init__: ttl=%d, populate_should_replace=%s, max_auto_arpa=%d',
+            '__init__: ttl=%d, populate_should_replace=%s, max_auto_arpa=%d, inherit_ttl=%s',
             ttl,
             populate_should_replace,
             max_auto_arpa,
+            inherit_ttl,
         )
         self.ttl = ttl
         self.populate_should_replace = populate_should_replace
         self.max_auto_arpa = max_auto_arpa
+        self.inherit_ttl = inherit_ttl
         self._records = defaultdict(list)
 
     def process_source_zone(self, desired, sources):
@@ -44,8 +46,12 @@ class AutoArpa(BaseProcessor):
                     auto_arpa_priority = record.octodns.get(
                         'auto_arpa_priority', 999
                     )
+                    if self.inherit_ttl:
+                        record_ttl = record.ttl
+                    else:
+                        record_ttl = self.ttl
                     self._records[f'{ptr}.'].append(
-                        (auto_arpa_priority, record.fqdn)
+                        (auto_arpa_priority, record_ttl, record.fqdn)
                     )
 
         return desired
@@ -55,7 +61,7 @@ class AutoArpa(BaseProcessor):
         # order the fqdns making a copy so we can reset the list below
         ordered = sorted(fqdns)
         fqdns = []
-        for _, fqdn in ordered:
+        for _, _, fqdn in ordered:
             if fqdn in seen:
                 continue
             fqdns.append(fqdn)
@@ -79,12 +85,13 @@ class AutoArpa(BaseProcessor):
         for arpa, fqdns in self._records.items():
             if arpa.endswith(f'.{zone_name}'):
                 name = arpa[:-n]
+                _, record_ttl, _ = fqdns[0]
                 # Note: this takes a list of (priority, fqdn) tuples and returns the ordered and uniqified list of fqdns.
                 fqdns = self._order_and_unique_fqdns(fqdns, self.max_auto_arpa)
                 record = Record.new(
                     zone,
                     name,
-                    {'ttl': self.ttl, 'type': 'PTR', 'values': fqdns},
+                    {'ttl': record_ttl, 'type': 'PTR', 'values': fqdns},
                     lenient=lenient,
                 )
                 zone.add_record(

tests/test_octodns_processor_arpa.py

@@ -27,7 +27,7 @@ class TestAutoArpa(TestCase):
         aa = AutoArpa('auto-arpa')
         aa.process_source_zone(zone, [])
         self.assertEqual(
-            {'4.3.2.1.in-addr.arpa.': [(999, 'a.unit.tests.')]}, aa._records
+            {'4.3.2.1.in-addr.arpa.': [(999, 3600, 'a.unit.tests.')]}, aa._records
         )
 
         # matching zone
@@ -56,8 +56,8 @@ class TestAutoArpa(TestCase):
         aa.process_source_zone(zone, [])
         self.assertEqual(
             {
-                '4.3.2.1.in-addr.arpa.': [(999, 'a.unit.tests.')],
-                '5.3.2.1.in-addr.arpa.': [(999, 'a.unit.tests.')],
+                '4.3.2.1.in-addr.arpa.': [(999, 1600, 'a.unit.tests.')],
+                '5.3.2.1.in-addr.arpa.': [(999, 1600, 'a.unit.tests.')],
             },
             aa._records,
         )
@@ -81,7 +81,7 @@ class TestAutoArpa(TestCase):
         aa = AutoArpa('auto-arpa')
         aa.process_source_zone(zone, [])
         ip6_arpa = '2.0.0.0.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.c.0.0.0.f.f.0.0.ip6.arpa.'
-        self.assertEqual({ip6_arpa: [(999, 'aaaa.unit.tests.')]}, aa._records)
+        self.assertEqual({ip6_arpa: [(999, 3600, 'aaaa.unit.tests.')]}, aa._records)
 
         # matching zone
         arpa = Zone('c.0.0.0.f.f.0.0.ip6.arpa.', [])
@@ -117,13 +117,13 @@ class TestAutoArpa(TestCase):
         aa.process_source_zone(zone, [])
         self.assertEqual(
             {
-                '4.3.2.1.in-addr.arpa.': [(999, 'geo.unit.tests.')],
-                '5.3.2.1.in-addr.arpa.': [(999, 'geo.unit.tests.')],
-                '1.1.1.1.in-addr.arpa.': [(999, 'geo.unit.tests.')],
-                '2.2.2.2.in-addr.arpa.': [(999, 'geo.unit.tests.')],
-                '3.3.3.3.in-addr.arpa.': [(999, 'geo.unit.tests.')],
-                '4.4.4.4.in-addr.arpa.': [(999, 'geo.unit.tests.')],
-                '5.5.5.5.in-addr.arpa.': [(999, 'geo.unit.tests.')],
+                '4.3.2.1.in-addr.arpa.': [(999, 3600, 'geo.unit.tests.')],
+                '5.3.2.1.in-addr.arpa.': [(999, 3600, 'geo.unit.tests.')],
+                '1.1.1.1.in-addr.arpa.': [(999, 3600, 'geo.unit.tests.')],
+                '2.2.2.2.in-addr.arpa.': [(999, 3600, 'geo.unit.tests.')],
+                '3.3.3.3.in-addr.arpa.': [(999, 3600, 'geo.unit.tests.')],
+                '4.4.4.4.in-addr.arpa.': [(999, 3600, 'geo.unit.tests.')],
+                '5.5.5.5.in-addr.arpa.': [(999, 3600, 'geo.unit.tests.')],
             },
             aa._records,
         )
@@ -194,8 +194,8 @@ class TestAutoArpa(TestCase):
         self.assertEqual(
             {
                 '4.3.2.1.in-addr.arpa.': [
-                    (999, 'a1.unit.tests.'),
-                    (999, 'a2.unit.tests.'),
+                    (999, 3600, 'a1.unit.tests.'),
+                    (999, 3600, 'a2.unit.tests.'),
                 ]
             },
             {'4.3.2.1.in-addr.arpa.': sorted_records},
@@ -219,7 +219,7 @@ class TestAutoArpa(TestCase):
         aa = AutoArpa('auto-arpa')
         aa.process_source_zone(zone, [])
         self.assertEqual(
-            {'4.3.20.10.in-addr.arpa.': [(999, 'a.unit.tests.')]}, aa._records
+            {'4.3.20.10.in-addr.arpa.': [(999, 3600, 'a.unit.tests.')]}, aa._records
         )
 
         # matching zone
@@ -259,7 +259,7 @@ class TestAutoArpa(TestCase):
         aa = AutoArpa('auto-arpa')
         aa.process_source_zone(zone, [])
         self.assertEqual(
-            {'4.3.2.1.in-addr.arpa.': [(999, 'a with spaces.unit.tests.')]},
+            {'4.3.2.1.in-addr.arpa.': [(999, 3600, 'a with spaces.unit.tests.')]},
             aa._records,
         )
 
@@ -275,18 +275,18 @@ class TestAutoArpa(TestCase):
     def test_arpa_priority(self):
         aa = AutoArpa('auto-arpa')
 
-        duplicate_values = [(999, 'a.unit.tests.'), (1, 'a.unit.tests.')]
+        duplicate_values = [(999, 3600, 'a.unit.tests.'), (1, 3600, 'a.unit.tests.')]
         self.assertEqual(
             ['a.unit.tests.'],
             aa._order_and_unique_fqdns(duplicate_values, max_auto_arpa=999),
         )
 
         duplicate_values = [
-            (50, 'd.unit.tests.'),
-            (999, 'dup.unit.tests.'),
-            (3, 'a.unit.tests.'),
-            (1, 'dup.unit.tests.'),
-            (2, 'c.unit.tests.'),
+            (50, 3600, 'd.unit.tests.'),
+            (999, 3600, 'dup.unit.tests.'),
+            (3, 3600, 'a.unit.tests.'),
+            (1, 3600, 'dup.unit.tests.'),
+            (2, 3600, 'c.unit.tests.'),
         ]
         self.assertEqual(
             [
@@ -298,20 +298,32 @@ class TestAutoArpa(TestCase):
             aa._order_and_unique_fqdns(duplicate_values, max_auto_arpa=999),
         )
 
-        duplicate_values_2 = [(999, 'a.unit.tests.'), (999, 'a.unit.tests.')]
+        duplicate_values_2 = [(999, 3600, 'a.unit.tests.'), (999, 3600, 'a.unit.tests.')]
         self.assertEqual(
             ['a.unit.tests.'],
             aa._order_and_unique_fqdns(duplicate_values_2, max_auto_arpa=999),
         )
 
-        ordered_values = [(999, 'a.unit.tests.'), (1, 'b.unit.tests.')]
+        ordered_values = [(999, 3600, 'a.unit.tests.'), (1, 3600, 'b.unit.tests.')]
         self.assertEqual(
             ['b.unit.tests.', 'a.unit.tests.'],
             aa._order_and_unique_fqdns(ordered_values, max_auto_arpa=999),
         )
 
-        max_one_value = [(999, 'a.unit.tests.'), (1, 'b.unit.tests.')]
+        max_one_value = [(999, 3600, 'a.unit.tests.'), (1, 3600, 'b.unit.tests.')]
         self.assertEqual(
             ['b.unit.tests.'],
             aa._order_and_unique_fqdns(max_one_value, max_auto_arpa=1),
         )
+
+    def test_arpa_inherit_ttl(self):
+        zone = Zone('unit.tests.', [])
+        record = Record.new(
+            zone, 'a1', {'ttl': 32, 'type': 'A', 'value': '1.2.3.4'}
+        )
+        zone.add_record(record)
+
+        aa = AutoArpa('auto-arpa', 3600, 999, True)
+        aa.populate(zone)
+        (ptr,) = zone.records
+        self.assertEqual(32, ptr.ttl)