persistent websocket

crates/common/Cargo.toml

@@ -6,4 +6,5 @@ edition.workspace = true
 
 [dependencies]
 serde.workspace = true
+thiserror = "1"
 uuid.workspace = true

crates/common/src/lib.rs

@@ -2,6 +2,26 @@ use serde::Deserialize;
 use serde::Serialize;
 
 pub type WebSocketMessage = State;
+pub type RestResponse<T> = Result<T, RestError>;
+
+#[derive(thiserror::Error, Default, Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
+#[error("{error}")]
+pub struct RestError {
+    pub error: String,
+}
+impl RestError {
+    pub fn new(err: impl Into<String>) -> Self {
+        Self { error: err.into() }
+    }
+}
+impl<T> From<T> for RestError
+where
+    T: Into<String>,
+{
+    fn from(value: T) -> Self {
+        RestError::new(value)
+    }
+}
 
 #[derive(Default, Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
 pub struct State {