use config file instead of env vars, add config option for bind address

.gitignore

 .idea/
 venv/
+config.ini
+__pycache__/

example_config.ini

+BIND_ADDR = ::
+PORT = 8337
+SYNAPSE_URL =
+ACCESS_TOKEN =
\ No newline at end of file

exporter.py

 #! /usr/bin/env python
-import os
-
 import requests
 from prometheus_client import start_http_server, Gauge
 from time import sleep
+import argparse
 
 metric_members = Gauge('matrix_channel_members_total', 'Members joined in room', ['room_id', 'canonical_alias', 'name'])
 metric_channel_types = Gauge('matrix_channel_types_total', 'Channels per type', ['type'])
 metric_channel_version = Gauge('matrix_channel_version_total', 'Channels per version', ['version'])
-metric_channel_state_events = Gauge('matrix_channel_state_events_total', 'State events per room', ['room_id', 'canonical_alias', 'name'])
+metric_channel_state_events = Gauge('matrix_channel_state_events_total', 'State events per room',
+                                    ['room_id', 'canonical_alias', 'name'])
 
 
-def fetch_metrics():
+def fetch_metrics(synapse_url, access_token):
     room_type_count = {
         'space': 0,
         'public': 0,
         'private': 0,
         'dm': 0
     }
+    room_version_count = {}
 
     auth = {
-		'Authorization': f"Bearer {config['token']}"
+        'Authorization': f"Bearer {access_token}"
     }
-	room_version_count = {}
-	rooms = requests.get(f"https://{config['synapse_url']}/_synapse/admin/v1/rooms", headers=auth).json()['rooms']
 
-	for room in sorted(rooms, key=lambda item: item['joined_members'], reverse=True):
+    rooms = requests.get(f"https://{synapse_url}/_synapse/admin/v1/rooms", headers=auth).json()['rooms']
+
+    for room in rooms:
         if room['version'] not in room_version_count:
             room_version_count[room['version']] = 0
 
@@ -59,18 +60,31 @@ def fetch_metrics():
         metric_channel_types.labels(type=room_type).set(count)
 
 
+def parse_config(config):
+    config_parsed = {}
+    for line in config.splitlines():
+        if not line.startswith('#') and len(line) > 0:
+            parts = line.split('=', 1)
+
+            config_parsed[parts[0].strip()] = parts[1].strip()
+
+    return config_parsed
+
+
 if __name__ == '__main__':
-	config = {
-		'port': int(os.environ.get('PORT')),
-		'token': os.environ.get('ACCESS_TOKEN'),
-		'synapse_url': os.environ.get('SYNAPSE_URL')
-	}
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-c', '--config',
+                        default='config.ini',
+                        type=argparse.FileType('r'))
+
+    args = parser.parse_args()
+    config = parse_config(args.config.read())
 
-	start_http_server(config['port'], addr='::')
+    start_http_server(int(config['PORT']), addr=config['BIND_ADDR'])
 
     while True:
         try:
-			fetch_metrics()
+            fetch_metrics(config['SYNAPSE_URL'], config['ACCESS_TOKEN'])
         except Exception as e:
             print('Exception:\n' + str(e))
         sleep(20)

requirements.txt

 requests
 prometheus-client
+argparse
\ No newline at end of file