Improve return type for insert function

server/texture-sync-server/src/model/mod.rs

@@ -22,12 +22,24 @@ pub struct Texture {
 }
 
 pub enum ReplaceTextureStatus {
-    // Done.
+    /// Done.
     Ok,
 
-    // Call Again With Texture Binary
+    /// Call Again With Texture Binary
     NeedTextureData(Sha256),
-
-    // Name or id already in use
-    Conflict,
+}
+
+pub type ProtocolResult<T> = Result<T, ProtocolError>;
+pub enum ProtocolError {
+    BadRequest(String),
+    FileNotFound(String),
+    Conflict(String),
+    InternalServerError(std::io::Error),
+    NotImplemented,
+}
+
+impl From<io::Error> for ProtocolError {
+    fn from(err: io::Error) -> Self {
+        ProtocolError::InternalServerError(err)
+    }
 }