stress dns less

dyndns-update.py

@@ -15,6 +15,7 @@ load_dotenv(verbose=True, dotenv_path=env_path)
 
 PDNS_API_BASE = os.getenv("PDNS_API_BASE")
 PDNS_TOKEN = os.getenv("PDNS_TOKEN")
+TMPFILE = '/tmp/lastIP'
 
 def pprint(text):
   print (json.dumps(text, sort_keys=True, indent=4, separators=(',', ': ')))
@@ -29,7 +30,7 @@ def set_record(zone, name, type, record):
       {
         'name': name,
         'type': type,
-        'ttl': 1,
+        'ttl': 30,
         'changetype': "REPLACE",
         'records': [ record ]
       }
@@ -42,17 +43,33 @@ def set_record(zone, name, type, record):
   print (p.text)
   print (p.status_code)
 
-record = {
-    'disabled': False,
-    'content': get_ip()
-    }
-
-if len(sys.argv) > 1:
-    if len(sys.argv) > 2:
-        record = {
-            'disabled': False,
-            'content': get_ip()
-            }
+
+if len(sys.argv) > 2:
+
+    if os.path.exists(TMPFILE):
+        with open(TMPFILE) as file:
+            try:
+                lastIP=file.read()
+            except:
+                printf('error reading ' + TMPFILE)
+    else:
+        lastIP = ''
+
+    currentIP = get_ip()
+
+    if lastIP == currentIP:
+        print ('IP has not changed since last call')
+        exit()
+
+    record = {
+        'disabled': False,
+        'content': currentIP
+        }
+
     set_record  (sys.argv[1], sys.argv[2]+'.', 'A', record)
+
+    with open(TMPFILE, 'w') as file:
+        file.write(currentIP)
+
 else:
-  print('Updates ip record of NAME in ZONE to current IP from ipinfo.io\n\nUsage:\n' + sys.argv[0] + ' ZONE NAME')
+  print('Updates IP record of NAME in ZONE to current IP from ipinfo.io\n\nUsage:\n' + sys.argv[0] + ' ZONE NAME')