refactor: move some config vars to the .env file

.env_sample

@@ -1,5 +1,17 @@
 secret=please_please_update_me_please
 algorithm=HS256
+# expiry time in seconds
+jwt_expiry_time=300
+
+# Amount of seconds the app will wait until it'll 
+# send another hardware update
+gather_hw_info_interval = 2
+# Amount of seconds the app will gather CPU usage data for each update
+# The resulting CPU usage is averaged over this period of time.
+# To get realistic results at least 0.1 seconds is recommended
+# must be less than and not equal to gather_hw_info_interval 
+cpu_usage_averaging_period = 0.5
+
 
 # Redis - uncomment if Redis runs with non standard values (i.e. in Docker etc)
 # redis_host=127.0.0.1

.gitignore

@@ -1 +1,2 @@
 __pycache__
+.env

README.md

@@ -2,7 +2,7 @@
 
 ## Configuration
 
-Update the `.env` file with your `bitcoind` and `lnd` configuration.
+Create a `.env` file with your `bitcoind` and `lnd` configuration. See the `.env_sample` file for all configuration options.  
 
 Please note that you will also need to install [Redis](https://redis.io/).
 

app/auth/auth_handler.py

@@ -6,10 +6,11 @@ from decouple import config
 
 JWT_SECRET = config("secret")
 JWT_ALGORITHM = config("algorithm")
+JWT_EXPIRY_TIME = config("jwt_expiry_time", default=300.0, cast=float)
 
 
 def signJWT() -> Dict[str, str]:
-    payload = {"user_id": "admin", "expires": time.time() + 300}
+    payload = {"user_id": "admin", "expires": time.time() + JWT_EXPIRY_TIME}
     token = jwt.encode(payload, JWT_SECRET, algorithm=JWT_ALGORITHM)
     return token_response(token)
 

app/repositories/hardware_info.py

@@ -2,11 +2,12 @@ import asyncio
 
 import psutil
 from app.utils import SSE, send_sse_message
+from decouple import config
 from fastapi import Request
 
-SLEEP_TIME = 1
-CPU_USAGE_INTERVAL = 0.5
-HW_INFO_YIELD_TIME = SLEEP_TIME+CPU_USAGE_INTERVAL
+SLEEP_TIME = config("gather_hw_info_interval", default=2, cast=float)
+CPU_AVG_PERIOD = config("cpu_usage_averaging_period", default=0.5, cast=float)
+HW_INFO_YIELD_TIME = SLEEP_TIME+CPU_AVG_PERIOD
 
 
 async def subscribe_hardware_info(request: Request):
@@ -22,9 +23,9 @@ def get_hardware_info() -> map:
     info = {}
 
     info['cpu_overall_percent'] = psutil.cpu_percent(
-        interval=CPU_USAGE_INTERVAL)
+        interval=CPU_AVG_PERIOD)
     info['cpu_per_cpu_percent'] = psutil.cpu_percent(
-        interval=CPU_USAGE_INTERVAL, percpu=True)
+        interval=CPU_AVG_PERIOD, percpu=True)
 
     v = psutil.virtual_memory()
     info['vram_total_bytes'] = v.total