Implement config file parsing

wallabag_kindle_consumer/config.py

@@ -1,14 +1,68 @@
-class Config:
+import os
+import configparser
 
-    def __init__(self, wallabag_host, db_uri, client_id, client_secret, domain, tag='kindle', refresh_grace=120,
-                 consume_interval=30, interface_host="127.0.0.1", interface_port=8080):
+from logbook import Logger
+
+logger = Logger(__name__)
+
+
+class Config:
+    known_values = ["wallabag_host", "db_uri", "client_id", "client_secret", "domain", "smtp_from", "smtp_host",
+                    "smtp_port", "smtp_user", "smtp_passwd", "tag", "refresh_grace", "consume_interval",
+                    "interface_host", "interface_port"]
+    required_values = ["wallabag_host", "db_uri", "client_id", "client_secret", "domain", "smtp_from", "smtp_host",
+                       "smtp_port", "smtp_user", "smtp_passwd"]
+
+    def __init__(self, wallabag_host, db_uri, client_id, client_secret, domain, smtp_from, smtp_host, smtp_port,
+                 smtp_user, smtp_passwd, tag='kindle', refresh_grace=120, consume_interval=30,
+                 interface_host="127.0.0.1", interface_port=8080):
         self.wallabag_host = wallabag_host
         self.db_uri = db_uri
         self.client_id = client_id
         self.client_secret = client_secret
         self.domain = domain
+        self.smtp_from = smtp_from
+        self.smtp_host = smtp_host
+        self.smtp_port = smtp_port
+        self.smtp_user = smtp_user
+        self.smtp_passwd = smtp_passwd
         self.tag = tag
         self.refresh_grace = refresh_grace
         self.consume_interval = consume_interval
         self.interface_host = interface_host
         self.interface_port = interface_port
+
+    @staticmethod
+    def from_file(filename):
+        if not os.path.exists(filename):
+            logger.warn("Config file {filename} does not exist", filename=filename)
+            return None
+
+        parser = configparser.ConfigParser()
+        parser.read(filename)
+
+        if 'DEFAULT' not in parser:
+            logger.warn("Config file {filename} does not contain a section DEFAULT", filename=filename)
+            return None
+
+        dflt = parser['DEFAULT']
+
+        tmp = {}
+        missing = []
+        for key in Config.known_values:
+            if key in dflt:
+                tmp[key] = dflt[key]
+            else:
+                if key in Config.required_values:
+                    missing.append(key)
+
+        if 0 != len(missing):
+            logger.warn("Config file {filename} does not contain configs for: {lst}", filename=filename,
+                        lst=", ".join(missing))
+            return None
+
+        return Config(**tmp)
+
+    @staticmethod
+    def from_env():
+        pass