exception decorator and mail send for errors and changes to rec state checker

backend/tools/send_mail.py

@@ -0,0 +1,45 @@
+import smtplib
+import traceback
+from email.message import EmailMessage
+from typing import List, Union
+
+from backend import main_logger, Config
+
+
+def send_mail(subject: str, msg_body: str, to_mail: List, from_mail: str = Config.FROM_MAIL):
+    subject = subject.strip().replace("\r", "").split("\n")[0]  # remove breaks resp. cut after line break
+    try:
+        msg = EmailMessage()
+        msg.set_content(msg_body)
+        msg["Subject"] = subject
+        msg["From"] = from_mail
+        msg["To"] = to_mail
+        s = smtplib.SMTP(Config.SMTP_SERVER)
+        s.send_message(msg)
+        s.quit()
+    except Exception as e:
+        main_logger.error(
+            "Could not send E-Mail (Exception: {})".format(str(e)))
+
+
+def send_error_mail(message_or_exception: Union[str, Exception], subject: str = None,
+                    subject_prefix: str = "[LRC] Error: ",
+                    receiver_mail_addresses=Config.ERROR_E_MAIL_TO):
+    if isinstance(message_or_exception, Exception):
+        if subject is None:
+            subject = subject_prefix + str(type(message_or_exception))
+        else:
+            subject = subject_prefix + subject
+        msg_body = str(type(message_or_exception)) + ": " + str(message_or_exception) + "\n\n" + traceback.format_exc()
+    else:
+        if subject is None:
+            subject = str(message_or_exception)
+        else:
+            subject = subject_prefix + subject
+        msg_body = str(message_or_exception)
+
+    send_mail(subject, msg_body, receiver_mail_addresses)
+
+
+def send_warning_mail():
+    pass