Replace expect usage with Result

emgauwa-lib/src/errors/emgauwa_error.rs

@@ -1,8 +1,11 @@
+use std::error::Error;
 use std::fmt::{Debug, Display, Formatter};
+use std::io::ErrorKind;
 
 use actix::MailboxError;
 use actix_web::http::StatusCode;
 use actix_web::HttpResponse;
+use config::ConfigError;
 use serde::ser::SerializeStruct;
 use serde::{Serialize, Serializer};
 
@@ -15,6 +18,7 @@ pub enum EmgauwaError {
 	Uid(uuid::Error),
 	Serialization(serde_json::Error),
 	Database(DatabaseError),
+	Other(String),
 	Internal(String),
 	Connection(ControllerUid),
 }
@@ -28,6 +32,7 @@ impl EmgauwaError {
 			EmgauwaError::Uid(_) => StatusCode::BAD_REQUEST,
 			EmgauwaError::Internal(_) => StatusCode::INTERNAL_SERVER_ERROR,
 			EmgauwaError::Connection(_) => StatusCode::GATEWAY_TIMEOUT,
+			EmgauwaError::Other(_) => StatusCode::INTERNAL_SERVER_ERROR,
 		}
 	}
 }
@@ -39,8 +44,9 @@ impl From<&EmgauwaError> for String {
 			EmgauwaError::Serialization(_) => String::from("error during (de-)serialization"),
 			EmgauwaError::Database(err) => String::from(err),
 			EmgauwaError::Uid(_) => String::from("the uid is in a bad format"),
-			EmgauwaError::Internal(_) => String::from("general error"),
+			EmgauwaError::Internal(_) => String::from("internal error"),
 			EmgauwaError::Connection(_) => String::from("the target controller is not connected"),
+			EmgauwaError::Other(err) => format!("other error: {}", err),
 		}
 	}
 }
@@ -81,12 +87,26 @@ impl From<MailboxError> for EmgauwaError {
 	}
 }
 
+impl From<ConfigError> for EmgauwaError {
+	fn from(value: ConfigError) -> Self {
+		Self::Other(value.to_string())
+	}
+}
+
 impl From<&EmgauwaError> for HttpResponse {
 	fn from(err: &EmgauwaError) -> Self {
 		HttpResponse::build(err.get_code()).json(err)
 	}
 }
 
+impl Error for EmgauwaError {}
+
+impl From<EmgauwaError> for std::io::Error {
+	fn from(value: EmgauwaError) -> Self {
+		std::io::Error::new(ErrorKind::Other, value)
+	}
+}
+
 impl Serialize for EmgauwaError {
 	fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
 	where