Added JsonResponse type

waku/src/general/mod.rs

@@ -0,0 +1,26 @@
+// std
+
+// crates
+use serde::Deserialize;
+// internal
+
+/// JsonResponse wrapper.
+/// `go-waku` ffi returns this type as a `char *` as per the [specification](https://rfc.vac.dev/spec/36/#jsonresponse-type)
+///
+#[derive(Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub(crate) enum JsonResponse<T> {
+    Result(T),
+    Error(String),
+}
+
+type Response<T> = Result<T, String>;
+
+impl<T> From<JsonResponse<T>> for Response<T> {
+    fn from(response: JsonResponse<T>) -> Self {
+        match response {
+            JsonResponse::Result(t) => Ok(t),
+            JsonResponse::Error(e) => Err(e),
+        }
+    }
+}