Add the bones of an Email Notification service

src/config/__init__.py

@@ -1,9 +1,9 @@
 import json
-from logging import INFO
 from dataclasses import dataclass
 from typing import Any
 
 from .logging import Logging
+from .email import Email
 from .parse import ConfigParseError, assert_key_of_type
 
 
@@ -12,21 +12,25 @@ class Config:
     host: str | None
     port: int | None
     logging: Logging
+    email: Email
 
     @classmethod
     def from_dict(cls, config: dict[str, Any]) -> 'Config':
         assert_key_of_type(config, 'logging', dict)
+        assert_key_of_type(config, 'email', dict)
         assert_key_of_type(config, 'host', str)
         assert_key_of_type(config, 'port', int)
         try:
             log_config = Logging.from_dict(config['logging'])
-            return Config(host=config['host'], port=config['port'], logging=log_config)
-
         except ConfigParseError as e:
             raise ConfigParseError(['logging', *e.keypath], e.issue) from e
 
+        try:
+            email_config = Email.from_dict(config['email'])
+        except ConfigParseError as e:
+            raise ConfigParseError(['email', *e.keypath], e.issue) from e
 
-DEFAULT_CONFIG = Config(logging=Logging(level=INFO), port=None, host=None)
+        return Config(host=config['host'], port=config['port'], email=email_config, logging=log_config)
 
 
 def parse_config(filename: str) -> Config:
@@ -35,4 +39,4 @@ def parse_config(filename: str) -> Config:
     return Config.from_dict(config)
 
 
-__all__ = ['Config', 'parse_config', 'DEFAULT_CONFIG']
+__all__ = ['Config', 'parse_config']

src/config/email.py

@@ -0,0 +1,18 @@
+from src.config.parse import assert_key_of_type
+from typing import Any
+from dataclasses import dataclass
+
+
+EmailAddress = str
+
+
+@dataclass
+class Email:
+    api_key: str
+    sender: EmailAddress
+
+    @classmethod
+    def from_dict(cls, config: dict[str, Any]) -> 'Email':
+        assert_key_of_type(config, 'api_key', str)
+        assert_key_of_type(config, 'sender', str)
+        return Email(api_key=config['api_key'], sender=config['sender'])