Fixed IPv6 access inside Docker container

.vscode/settings.json

@@ -9,13 +9,14 @@
         ".vscode": true,
         "LICENSE": true,
         "requirements.txt": true,
-        "build-docker-image.sh": false,
+        "build-docker-image.sh": true,
         ".gitignore": true,
-        "Dockerfile": false,
-        "start-sync.sh": false,
+        "Dockerfile": true,
+        "start-sync.sh": true,
         "venv": true
     },
     "explorerExclude.backup": null,
     "python.linting.pylintEnabled": true,
-    "python.linting.enabled": true
+    "python.linting.enabled": true,
+    "python.pythonPath": "venv/bin/python"
 }

Dockerfile

@@ -11,7 +11,7 @@ RUN pip install -r requirements.txt
 #
 # ---- Release ----
 FROM dependencies AS release
-# copy project file(s)
+# copy project source file(s)
 WORKDIR /
 COPY cloudflare-ddns.py .
-CMD ["python", "/cloudflare-ddns.py", "--repeat"]
+CMD ["python", "-u", "/cloudflare-ddns.py", "--repeat"]

cloudflare-ddns.py

@@ -1,5 +1,5 @@
 import requests, json, sys, os
-import time, traceback
+import time
 
 PATH = os.getcwd() + "/"
 version = float(str(sys.version_info[0]) + "." + str(sys.version_info[1]))
@@ -10,7 +10,6 @@ if(version < 3.5):
 with open(PATH + "config.json") as config_file:
     config = json.loads(config_file.read())
 
-
 def getIPs():
     a = requests.get("https://api.ipify.org?format=json").json().get("ip")
     aaaa = requests.get("https://api6.ipify.org?format=json").json().get("ip")
@@ -27,6 +26,8 @@ def getIPs():
             "type": "AAAA",
             "ip": aaaa
         })
+    else:
+        print("Warning: IPv6 not detected.")
 
     return ips
 
@@ -102,26 +103,21 @@ def cf_api(endpoint, method, config, headers={}, data=False):
 
     return response.json()
 
-def every(delay, task):
-  next_time = time.time() + delay
-  while True:
-    time.sleep(max(0, next_time - time.time()))
-    try:
-      task()
-    except Exception:
-      traceback.print_exc()
-      # in production code you might want to have this instead of course:
-      # logger.exception("Problem while executing repetitive task.")
-    # skip tasks if we are behind schedule:
-    next_time += (time.time() - next_time) // delay * delay + delay
-
 def updateIPs():
     for ip in getIPs():
-        print("Checking " + ip["type"] + " records")
         commitRecord(ip)
 
 if(len(sys.argv) > 1):
     if(sys.argv[1] == "--repeat"):
-        import threading
-        threading.Thread(target=lambda: every(60*15, updateIPs)).start()
-updateIPs()
+        print("Updating A & AAAA records every 15 minutes")
+        updateIPs()
+        delay = 15*60 # 15 minutes
+        next_time = time.time() + delay
+        while True:
+            time.sleep(max(0, next_time - time.time()))
+            updateIPs()
+            next_time += (time.time() - next_time) // delay * delay + delay
+    else:
+        print("Unrecognized parameter '" + sys.argv[1] + "'. Stopping now.")
+else:
+    updateIPs()

docker-compose.yml

@@ -1,13 +1,14 @@
 version: "3.7"
 services:
   cloudflare-ddns:
-    image: timothymiller/cloudflare-ddns:latest
+    image: timothyjmiller/cloudflare-ddns:latest
     container_name: cloudflare-ddns
     security_opt:
       - no-new-privileges:true
+    network_mode: "host"
     environment:
       - PUID=1000
       - PGID=1000
     volumes:
-      - /EDIT/YOUR/PATH/HERE/config.json:/config.json
+      - /YOUR/PATH/HERE/config.json:/config.json
     restart: unless-stopped