Handle missing JSON-RPC params and add test

Add #[serde(default)] to JsonRpcCall.params so requests that omit the params field deserialize to Value::Null instead of failing. Also add a unit test verifying that a JSON-RPC request without params is parsed as a Single JsonRpcRequest and that call.params == Value::Null. This makes the JSON-RPC input handling more robust for requests that don't include params.

Author: gemcoder21

core/apps/dynode/src/jsonrpc_types.rs

@@ -6,6 +6,7 @@ use serde_json::Value;
 pub struct JsonRpcCall {
     pub jsonrpc: String,
     pub method: String,
+    #[serde(default)]
     pub params: Value,
     pub id: u64,
 }
@@ -211,6 +212,20 @@ mod tests {
         assert_eq!(key, "example.com:POST:/rpc:eth_blockNumber");
     }
 
+    #[test]
+    fn test_request_parsing_without_params() {
+        let body = br#"{"jsonrpc":"2.0","method":"getSlot","id":1}"#.to_vec();
+        let request_type = RequestType::from_request("POST", "/solana".to_string(), body);
+
+        match request_type {
+            RequestType::JsonRpc(JsonRpcRequest::Single(call)) => {
+                assert_eq!(call.method, "getSlot");
+                assert_eq!(call.params, Value::Null);
+            }
+            _ => panic!("Expected JSON-RPC request"),
+        }
+    }
+
     #[test]
     fn test_batch_request_parsing() {
         let batch_json = r#"[