server: Merge insert and update methods and routes

musicus_server/src/error.rs

@@ -0,0 +1,50 @@
+use actix_web::{dev::HttpResponseBuilder, error, http::StatusCode, HttpResponse};
+use derive_more::{Display, Error};
+
+/// An error intended for the public interface.
+#[derive(Display, Error, Debug)]
+pub enum ServerError {
+    NotFound,
+    Unauthorized,
+    Forbidden,
+    Internal,
+}
+
+impl error::ResponseError for ServerError {
+    fn error_response(&self) -> HttpResponse {
+        HttpResponseBuilder::new(self.status_code()).finish()
+    }
+
+    fn status_code(&self) -> StatusCode {
+        match self {
+            ServerError::NotFound => StatusCode::NOT_FOUND,
+            ServerError::Unauthorized => StatusCode::UNAUTHORIZED,
+            ServerError::Forbidden => StatusCode::FORBIDDEN,
+            ServerError::Internal => StatusCode::INTERNAL_SERVER_ERROR,
+        }
+    }
+}
+
+impl From<r2d2::Error> for ServerError {
+    fn from(_: r2d2::Error) -> Self {
+        ServerError::Internal
+    }
+}
+
+impl From<anyhow::Error> for ServerError {
+    fn from(error: anyhow::Error) -> Self {
+        match error.downcast() {
+            Ok(error) => error,
+            Err(_) => ServerError::Internal,
+        }
+    }
+}
+
+impl From<error::BlockingError<ServerError>> for ServerError {
+    fn from(error: error::BlockingError<ServerError>) -> Self {
+        match error {
+            error::BlockingError::Error(error) => error,
+            error::BlockingError::Canceled => ServerError::Internal,
+        }
+    }
+}