move to env var for configuration

steckie.py

@@ -16,12 +16,12 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import os
 import sys
 import yaml
 import json
 import logging
 import argparse
-from datetime import datetime
 import urllib.request
 from influxdb import InfluxDBClient
 from apscheduler.schedulers.blocking import BlockingScheduler
@@ -30,18 +30,52 @@ from apscheduler.schedulers.blocking import BlockingScheduler
 CONFIGFILE = "/opt/steckie/config.yml"
 CMD_SENSOR = "cm?cmnd=Status%208"
 
+CFG_DEFAULTS = {
+    "STECKIE_ITVL": 5,
+    "INFLUXDB_PORT": 8086,
+}
+
+CFG_NEEDED = {
+    "INFLUXDB_HOST": "hostname",
+    "INFLUXDB_DB": "database_name",
+    "INFLUXDB_USER": "username",
+    "INFLUXDB_USER_PASSWORD": "SuperSecure",
+}
+
+CFG_VAR = {
+    "name": r'STECKIE_DEV_\d+_NAME',
+    "url": r'STECKIE_DEV_\d+_URL',
+}
+
 
 class Steckie:
-    def __init__(self, cfgfile):
+    def __init__(self, env_file):
         self.cfg = dict()
+        env = os.environ
+
+        print("Env file: {}".format(env_file))
 
         # read configuration
-        try:
-            with open(cfgfile, 'r', encoding="utf-8") as f:
-                self.cfg.update(yaml.load(f, Loader=yaml.BaseLoader))
-        except:
-            logging.error("unable to read config file '{}'".format(cfgfile))
-            sys.exit(1)
+        if env_file:
+            env = self.read_env(env_file)
+        for val in CFG_DEFAULTS:
+            self.cfg[val] = env[val] if val in env else CFG_DEFAULTS[val]
+        for val in CFG_NEEDED:
+            if val in env:
+                self.cfg[val] = env[val]
+            else:
+                logging.error("unable to read {} fron env".format(val))
+                sys.exit(1)
+
+        if cfgfile:
+            try:
+                with open(cfgfile, 'r', encoding="utf-8") as f:
+                    self.cfg.update(yaml.load(f, Loader=yaml.BaseLoader))
+            except:
+                logging.error("unable to read config file '{}'".format(cfgfile))
+                sys.exit(1)
+
+
 
         self.scheduler = BlockingScheduler()
         self.db = InfluxDBClient(host=self.cfg['db']['host'],
@@ -94,12 +128,12 @@ class Steckie:
 def main(args):
     logging.basicConfig(format='%(asctime)s %(message)s',
                         level=logging.WARNING)
-    steckie = Steckie(args.cfgfile)
+    steckie = Steckie(args.env_file)
     steckie.run()
 
 
 if __name__ == "__main__":
     p = argparse.ArgumentParser()
-    p.add_argument("cfgfile", default=CONFIGFILE, nargs='?', help="output dump")
+    p.add_argument("env_file", default=None, nargs="?", help="output dump")
     args = p.parse_args()
     main(args)