Add env vars to readme

Author: quietsy

README.md

@@ -24,14 +24,11 @@ This mod gives SWAG the ability to start containers on-demand when accessed thro
                     '"$http_referer" "$http_user_agent"';
     access_log /config/log/nginx/access.log main;
     ```
-- *Optional* - In SWAG's docker arguments, set an environment variable `SWAG_ONDEMAND_STOP_THRESHOLD` to override the period of inactivity in seconds before stopping the container. Defaults to `600` which is 10 minutes.
-    ```yaml
-    swag:
-        container_name: swag
-        ...
-        environment:
-            - SWAG_ONDEMAND_STOP_THRESHOLD=600
-    ```
+- *Optional* - Additional environment variables
+  - `SWAG_ONDEMAND_STOP_THRESHOLD` - duration of inactivity in seconds before stopping on-demand containers, defaults to `600` (10 minutes).
+  - `SWAG_ONDEMAND_CONTAINER_QUERY_SLEEP` - sleep time in seconds between querying containers, defaults to `5.0`.
+  - `SWAG_ONDEMAND_LOG_READER_SLEEP` - sleep time in seconds between log reads, defaults to `1.0`.
+
 ### Loading Page:
 
 ![loading-page](.assets/loading-page.png)

root/app/swag-ondemand.py

@@ -7,6 +7,8 @@
 
 ACCESS_LOG_FILE = "/config/log/nginx/access.log"
 LOG_FILE = "/config/log/ondemand/ondemand.log"
+CONTAINER_QUERY_SLEEP = float(os.environ.get("SWAG_ONDEMAND_CONTAINER_QUERY_SLEEP", "5.0"))
+LOG_READER_SLEEP = float(os.environ.get("SWAG_ONDEMAND_LOG_READER_SLEEP", "1.0"))
 STOP_THRESHOLD = int(os.environ.get("SWAG_ONDEMAND_STOP_THRESHOLD", "600"))
 
 last_accessed_urls = set()
@@ -75,7 +77,7 @@ def run(self):
                 self.process_containers()
                 self.start_containers()
                 self.stop_containers()
-                time.sleep(5)
+                time.sleep(CONTAINER_QUERY_SLEEP)
             except Exception as e:
                 logging.exception(e)
 
@@ -91,7 +93,7 @@ def tail(self, f):
         while True:
             line = f.readline()
             if not line:
-                time.sleep(1)
+                time.sleep(LOG_READER_SLEEP)
                 if os.stat(ACCESS_LOG_FILE).st_ino != inode:
                     f.close()
                     f = open(ACCESS_LOG_FILE, 'r')