Here is your solution in the required Markdown format:
You have a function called
cf-dyndns.sh that runs a cron job to update DynDNS records for a server listening on port
80. The update process involves sending notifications about successful updates or failures.
To handle it, you can create another function, let's call it
notify_dyndns, with the following code:
``
python
import subprocess
def notify_dyndns(update_message):
try:
# Update DynDNS records. Replace the placeholder for the server name and update type.
if "STATUS:NO_CHANGE" in output:
return None
elif "ERROR" in output or int(output.split("ERROR")[1].split(": ")[0]) != 2:
warning = (
f"DynDNS Error: {output}"
)
else:
updates = subprocess.call(
["curl", "-L", "http://status.dyndns.com"], stdin=subprocess.PIPE
) # Check if the server is available to be updated first
update_output = output
return (
"Updated DynDNS records. "
f"{update_message} (Server: {server_name}, Update Type: {update_type})"
),
except subprocess.CalledProcessError as e:
error = (
f"dyndns update failed with exit code {e.returncode}. {str(e)}"
)
return error,
`
In this function, it checks if the server is available for updating (by checking STATUS NoelChange
in the output). If so, it sends a "no change" notification. Otherwise, it attempts to send notifications about updates or failures, using curl
to retrieve and process the update data.
To receive notifications when DynDNS errors occur, you can add a new function called send_dynamicfailNotification
. This is an example:
`
python
def send_dynamicfailNotification(error_message):
try:
notify_senders = [
"server1.dyn1.name: 1503980922525",
"server2.dyn2.name: 1511697499654459422",
server1_dynserver_name,
]
for sender in notify_senders:
send_process = subprocess.Popen(
[python3_script], # path to python script that updates DynDNS
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
)
try:
if isinstance(error_message, str):
error_response = str(error_message)
else:
event = (str(error_message),)
except Exception as err:
message = (
"Error Sending Notify: "
f"python3 {script_path}: "
f"{err}"
)
raise CommandError(message)
if isinstance(error_message, tuple):
send_process.sendall(event.encode())
elif isinstance(error_message, str):
(send_process.stdout,
_ )= send_process.communicate(error_message.encode())
return False
`
In this example, you can use your notify_dyndns` function to trigger an email notification when DynDNS errors occur or a successful update occurs.
You should also make sure you have all necessary permissions and that the Python script (including any external dependencies like dyndns) is running with the right privileges on your server.