working macro builder

lib/u_lib/src/client/client.rs

@@ -53,8 +53,6 @@ impl ClientInfo {
     }
 }
 
-impl ToMsg for ClientInfo {}
-
 const DEFAULT_JOBS: &[(&str, &str)] = &[
     //("local ip", "ip a"),
     ("hostname", "hostname"),

lib/u_lib/src/client/network.rs

@@ -2,7 +2,8 @@ use crate::{
     MASTER_SERVER,
     MASTER_PORT,
     contracts::*,
-    UResult
+    UResult,
+    UError
 };
 use reqwest::{
     Client,
@@ -12,8 +13,7 @@ use reqwest::{
 };
 use std::{
     net::Ipv4Addr,
-    str::FromStr,
-    any::Any
+    str::FromStr
 };
 
 pub struct Paths;
@@ -71,7 +71,7 @@ impl ClientHandler {
 
     pub async fn init(&self, param: &ClientInfo) -> UResult<RawMsg> {
         let response: Response = self.build_post(Paths::NEW)
-            .json(&param.as_message())
+            .json::<Message<'_, ClientInfo>>(&param.as_message())
             .send()
             .await?;
         let msg = response
@@ -96,33 +96,42 @@ impl ClientHandler {
     }*/
 }
 
+#[macro_export]
+macro_rules! epilogue {
+    ( () ) => ( |_| async Ok(()) );
+    ( $result:ty ) => {
+        |response: Response| async {
+            response
+                .json::<Message<$result>>()
+                .await
+                .map(|msg| msg.into_item().into_owned())
+                .map_err(|e| UError::from(e))
+        }
+    };
+}
+
 // build_handler![path = new, method = "post", param = ClientInfo, result = RawMsg]
 // param and result must impl ToMsg
+#[macro_export]
 macro_rules! build_handler {
     (
         path = $path:tt,
         method = $method:literal,
-        param = $param:ty,
+        param = $($param:ty)?,
         result = $result:ty
     ) => {
         impl ClientHandler {
-            pub async fn $path(&self, param: &$param) -> UResult<$result> {
+            pub async fn $path(&self $(, param: &$param)?) -> UResult<$result> {
                 let builder = match $method {
                     "post" => ClientHandler::build_post,
                     "get" => ClientHandler::build_get,
                     _ => panic!("Method '{}' is not allowed", $method)
                 };
-                let base_request = builder(self, stringify!($path));
-                let request = if let Some(p) = (param as &dyn Any).downcast_ref::<EmptyMsg>() {
-                    base_request
-                } else {
-                    base_request.json(&param.as_message())
-                };
+                let mut request = builder(self, stringify!($path));
+                request = request
+                    $(.json::<Message<'_, $param>>(&param.as_message()))?;
                 let response = request.send().await?;
-                let msg = response
-                    .json::<Message<$result>>()
-                    .await?;
-                Ok(msg.into_item().into_owned())
+                ($crate::epilogue!($result)(response)).await
             }
         }
 
@@ -135,7 +144,7 @@ macro_rules! build_handler {
         path = $path:tt,
         method = $method:literal
     ) => (
-        build_handler!(path = $path, method = $method, param = EmptyMsg, result = EmptyMsg);
+        build_handler!(path = $path, method = $method, param = , result = ());
     );
 
     (
@@ -143,7 +152,7 @@ macro_rules! build_handler {
         method = $method:literal,
         param = $param:ty
     ) => (
-        build_handler!(path = $path, method = $method, param = $param, result = EmptyMsg);
+        build_handler!(path = $path, method = $method, param = $param, result = ());
     );
 
     (
@@ -151,7 +160,7 @@ macro_rules! build_handler {
         method = $method:literal,
         result = $result:ty
     ) => (
-        build_handler!(path = $path, method = $method, param = EmptyMsg, result = $result);
+        build_handler!(path = $path, method = $method, param = , result = $result);
     );
 }
 

lib/u_lib/src/contracts/messaging.rs

@@ -55,10 +55,6 @@ where I: Clone {
 pub struct RawMsg(pub String);
 
 
-#[derive(Serialize, Deserialize, Debug, Clone)]
-pub struct EmptyMsg;
-
-
 /*
 #[cfg(test)]
 mod tests {

lib/u_lib/src/contracts/mod.rs

@@ -34,4 +34,4 @@ macro_rules! to_message {
     }
 }
 
-to_message!(ClientInfo, RawMsg, EmptyMsg);
+to_message!(ClientInfo, RawMsg);