Enhancements: Upgraded Actions, Improved Logging, Restructured Project (#1)

* update python project use setup tools, and upgrade github action version

* add manual run trigger

* add check not found check

* remove TODO as not possible

* Update doc and add default value of non required config

---------

Co-authored-by: Snigdhajyoti Ghosh <snigdhasjg@users.noreply.github.com>

docker_nsupdate_ddns/main.py

@@ -0,0 +1,105 @@
+import os
+import stat
+import sys
+from dotenv import dotenv_values
+import time
+
+from docker_nsupdate_ddns.lib import *
+import logging
+
+config = {}
+ipam4_old = {}
+
+logging.basicConfig(level=logging.INFO, format='%(asctime)s %(name)s [%(levelname)s] %(message)s')
+LOG = logging.getLogger(__name__)
+
+
+def main():
+    global config
+    config = get_config()
+    check_required_vars(config)
+
+    if not eval(config['ONE_SHOT']):
+        while True:
+            loop()
+            time.sleep(int(config['REFRESH_INTERVAL']))
+
+    loop()
+    LOG.info("Ending the process as ONE_SHOT is True")
+
+
+def check_required_vars(_config):
+    # Check for all required config
+    required_vars = [
+        'DOMAIN',
+        'NAMESERVER',
+        'TSIG_NAME',
+        'DOCKER_SOCKET',
+        'HOSTNAME_LABEL',
+        'IGNORE_LABEL',
+        'DNS_RECORD_TTL',
+        'DEFAULT_NETWORK',
+        'REFRESH_INTERVAL',
+        'ONE_SHOT'
+    ]
+    missing_vars = []
+    for item in required_vars:
+        if item in _config:
+            LOG.info(f"Detected config value: {item}={_config[item]}")
+        else:
+            missing_vars.append(item)
+    if 'TSIG_KEY' not in _config:
+        # Don't log it as it's a secret
+        missing_vars.append('TSIG_KEY')
+    if len(missing_vars) > 1:
+        LOG.error(f"Missing required config: {', '.join(missing_vars)}")
+        exit(1)
+
+    # Check if docker socket is correct
+    try:
+        if not stat.S_ISSOCK(os.stat(_config['DOCKER_SOCKET']).st_mode):
+            LOG.error(f"{_config['DOCKER_SOCKET']} not a docker socket file, exiting...")
+            exit(1)
+    except Exception as e:
+        LOG.error(f"Docker socket {_config['DOCKER_SOCKET']} not found.", e)
+        raise e
+
+
+def loop():
+    container.init(config)
+    ipam4 = container.generate_container_list()
+    global ipam4_old
+
+    additions4 = determine_additions(ipam4, ipam4_old)
+    deletions4 = determine_deletions(ipam4, ipam4_old)
+
+    nsupdate.init(config)
+    nsupdate.delete_records(deletions4)
+    nsupdate.add_records(additions4)
+
+    ipam4_old = ipam4
+
+
+def get_config():
+    config_file = sys.argv[1] if len(sys.argv) >= 2 else 'config.env'
+
+    x = {
+        **dotenv_values(os.path.join(os.path.dirname(__file__), 'default.config.env')),
+        **dotenv_values(os.path.join(os.getcwd(), config_file)),
+        **os.environ
+    }
+
+    return x
+
+
+def determine_additions(ipam, ipam_old):
+    return {k: v for k, v in ipam.items() if k not in ipam_old}
+
+
+def determine_deletions(ipam, ipam_old):
+    return {k: v for k, v in ipam_old.items() if k not in ipam}
+    pass
+
+
+if __name__ == "__main__":
+    main()