utilize /etc/ directory

+ add config.py to read / touch create the etc config file

.gitignore

@@ -110,6 +110,7 @@ dmypy.json
 # Pycharm
 .idea/
 .venv/
+venv
 
 # config
 config.json

config.py

@@ -0,0 +1,66 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+import json
+import sys
+from pathlib import Path
+
+
+class Config:
+    def __init__(self):
+        # global config path
+        conf_path = '/etc/ejabberd-metrics.conf'
+        self.file = Path(conf_path)
+        self.content = None
+
+        # read config file
+        self._read()
+
+    def _read(self):
+        """init the config object with this method"""
+        self._check()
+
+        # open and load json content from config
+        with open(self.file, 'r', encoding='utf-8') as f:
+            try:
+                self.content = json.load(f)
+
+            # catch json decoding errors
+            except json.JSONDecodeError as err:
+                print(err, file=sys.stderr)
+                exit(1)
+
+    def _check(self):
+        """internal method to check if the config file exists"""
+        try:
+            # if file is present try to read it's contents
+            if self.file.exists():
+                return
+
+            # if not create a blank file
+            else:
+                Path.touch(self.file)
+
+        # catch permission exceptions as this tries to write to /etc/
+        except PermissionError as err:
+            print(err, file=sys.stderr)
+            sys.exit(err.errno)
+
+    def get(self, key: str = None, default: (str, int) = None) -> (dict, str, int, None):
+        """method to retrieve the whole config data, a single value or the optional default value"""
+        # if a special key is request, return only that value
+        if key is not None:
+
+            # safety measure
+            if key in self.content:
+                return self.content[key]
+
+            # if a default value is given return that
+            if default is not None:
+                return default
+
+            # if the key isn't part if self.content return None
+            else:
+                return None
+
+        # else return everything
+        return self.content

influx.py

@@ -1,12 +1,10 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
-
-import json
-import os
 import time
 
 from influxdb import InfluxDBClient
 
+from config import Config
 from ejabberdrpc import EjabberdMetrics
 
 
@@ -79,19 +77,17 @@ class Influx:
 
 if __name__ == '__main__':
     # load config
-    path = os.path.dirname(__file__)
-    with open('/'.join([path, 'config.json']), 'r', encoding='utf-8') as f:
-        config = json.load(f)
+    config = Config()
 
-    # creds and params
-    url = config['url'] if 'url' in config else 'http://localhost:5280/api'
-    login = config['login'] if 'login' in config else None
-    api = config['api'] if 'api' in config else 'rest'
+    # credentials and parameters
+    url = config.get('url', default='http://localhost:5280/api')
+    login = config.get('login', default=None)
+    api = config.get('api', default='rest')
 
     # config influxdb
-    influx_host = config['influxdb_host'] if 'influxdb_host' in config else 'localhost'
-    influx_port = config['influxdb_port'] if 'influxdb_port' in config else 8086
-    influx_dbname = config['influxdb_db'] if 'influxdb_db' in config else 'ejabberd'
+    influx_host = config.get('influxdb_host', default='localhost')
+    influx_port = config.get('influxdb_port', default=8086)
+    influx_dbname = config.get('influxdb_db', default='ejabberd')
 
     # init handler
     metrics = EjabberdMetrics(url, login, api)

prometheus.py

@@ -1,14 +1,16 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
-from ejabberdrpc import EjabberdMetrics
-
-import time
-import threading
 import socket
+import threading
+import time
 from http.server import BaseHTTPRequestHandler, HTTPServer
 from socketserver import ThreadingMixIn
 
+from config import Config
+from ejabberdrpc import EjabberdMetrics
+
+
 class _ThreadingSimpleServer(ThreadingMixIn, HTTPServer):
     """Thread per request HTTP server."""
     # Make worker threads "fire and forget". Beginning with Python 3.7 this
@@ -65,10 +67,8 @@ class Prometheus():
                     for k, v in data.items():
                         output += self._parse_metric("ejabberd_online_client_ipversion", v, {"vhost": host, "node": node, "ipversion": str(k), "client": client})
 
-
         return output
 
-
     def listen(self, port, addr='::'):
         """Starts an HTTP server for prometheus metrics as a daemon thread"""
         class myHandler(BaseHTTPRequestHandler):
@@ -79,28 +79,24 @@ class Prometheus():
                 result = self._get_metrics()
                 r.wfile.write(result.encode('utf-8'))
 
-        
         httpd = _ThreadingSimpleServer((addr, port), myHandler)
         t = threading.Thread(target=httpd.serve_forever)
         t.daemon = True
         t.start()
 
+
 if __name__ == "__main__":
-    import os
-    import json
-
     # load config
-    path = os.path.dirname(__file__)
-    with open("/".join([path, "config.json"]), "r", encoding="utf-8") as f:
-        config = json.load(f)
+    config = Config()
 
+    # credentials and parameters
+    url = config.get('url', default='http://[::1]:5280/api')
+    login = config.get('login', default=None)
+    api = config.get('api', default='rest')
 
-    url = config['url'] if "url" in config else "http://[::1]:5280/api"
-    login = config['login'] if "login" in config else None
-    api = config['api'] if "api" in config else "rest"
-
-    prom_port = config['prometheus_port'] if "prometheus_port" in config else 8080
-    prom_refresh = config['prometheus_refresh'] if "prometheus_refresh" in config else 10
+    # config prometheus
+    prom_port = config.get('prometheus_port', default=8080)
+    prom_refresh = config.get('prometheus_refresh', default=10)
 
     metrics = EjabberdMetrics(url, login, api)
     prom = Prometheus(metrics)