Database: allow mysql, config in ini file

Also check for ini file existence at startup

.gitignore

@@ -1,2 +1,3 @@
 *.db
+fioul.ini
 __pycache__

config.py

@@ -2,4 +2,10 @@ from configparser import ConfigParser
 import os
 
 conf = ConfigParser()
-conf.read(os.path.dirname(__file__) + "/fioul.ini")
+ini_file = os.path.dirname(__file__) + "/fioul.ini"
+try:
+    conf.read_file(open(ini_file))
+except FileNotFoundError:
+    print("Configuration file 'fioul.ini' not found")
+    print("Please take a look at 'fioul.ini.example' to create one")
+    exit(42)

fioul.ini.example

@@ -1,3 +1,16 @@
+[db]
+backend = sqlite
+
+[sqlite]
+filename = fioul.db
+
+[mysql]
+database = fioul
+user = please change me
+password = please change me
+host = localhost
+port = 3306
+
 [server]
 host = localhost
 port = 9980

models.py

@@ -1,11 +1,24 @@
+from config import conf
 from peewee import SqliteDatabase
 from peewee import Model
 from peewee import AutoField, DateField, IntegerField
 
 from peewee import IntegrityError
 
+backend = conf["db"].get("backend", None)
+if backend == "sqlite":
     # SQLite database
-db = SqliteDatabase("fioul.db")
+    db = SqliteDatabase(conf["sqlite"].get("filename", "sqlite.db"))
+elif backend == "mysql":
+    db = MySQLDatabase(
+        conf["mysql"].get("database"),
+        user=conf["mysql"].get("user"),
+        password=conf["mysql"].get("password"),
+        host=conf["mysql"].get("host", "localhost"),
+        port=conf["mysql"].getint("port", 3306),
+    )
+else:
+    db = None
 
 
 class BaseModel(Model):