feat: event management and websocket for updates

sparse-server/src/error.rs

@@ -10,7 +10,10 @@ pub enum Error {
     Pbkdf2(pbkdf2::password_hash::errors::Error),
     #[cfg(feature = "ssr")]
     Io(std::io::Error),
+    #[cfg(feature = "ssr")]
+    Axum(axum::Error),
     AddrParse(std::net::AddrParseError),
+    Json(serde_json::Error),
 }
 
 impl std::fmt::Display for Error {
@@ -41,6 +44,13 @@ impl std::fmt::Display for Error {
             Error::AddrParse(err) => {
                 write!(f, "ip address parse error: {err:?}")
             }
+            Error::Json(err) => {
+                write!(f, "json encode/decode error: {err:?}")
+            }
+            #[cfg(feature = "ssr")]
+            Error::Axum(err) => {
+                write!(f, "axum error: {err:?}")
+            }
         }
     }
 }
@@ -55,6 +65,9 @@ impl std::error::Error for Error {
             #[cfg(feature = "ssr")]
             Error::Io(err) => Some(err),
             Error::AddrParse(err) => Some(err),
+            Error::Json(err) => Some(err),
+            #[cfg(feature = "ssr")]
+            Error::Axum(err) => Some(err),
             _ => None,
         }
     }
@@ -112,3 +125,16 @@ impl From<std::net::AddrParseError> for Error {
         Self::AddrParse(err)
     }
 }
+
+impl From<serde_json::Error> for Error {
+    fn from(err: serde_json::Error) -> Self {
+        Self::Json(err)
+    }
+}
+
+#[cfg(feature = "ssr")]
+impl From<axum::Error> for Error {
+    fn from(err: axum::Error) -> Self {
+        Self::Axum(err)
+    }
+}