Structure packets better

cove-core/src/macros.rs

@@ -0,0 +1,43 @@
+macro_rules! packets {
+    ( $( $name:ident($cmd:ident, $rpl:ident), )* ) => {
+        #[derive(Debug, Deserialize, Serialize)]
+        #[serde(tag = "name", content = "data")]
+        pub enum Cmd {
+            $( $name($cmd), )*
+        }
+
+        $(
+            impl std::convert::TryFrom<Cmd> for $cmd {
+                type Error = ();
+                fn try_from(cmd: Cmd) -> Result<Self, Self::Error> {
+                    match cmd {
+                        Cmd::$name(val) => Ok(val),
+                        _ => Err(()),
+                    }
+                }
+            }
+        )*
+
+        #[derive(Debug, Deserialize, Serialize)]
+        #[serde(tag = "name", content = "data")]
+        pub enum Rpl {
+            $( $name($rpl), )*
+        }
+
+        $(
+            impl std::convert::TryFrom<Rpl> for $rpl {
+                type Error = ();
+                fn try_from(rpl: Rpl) -> Result<Self, Self::Error> {
+                    match rpl {
+                        Rpl::$name(val) => Ok(val),
+                        _ => Err(()),
+                    }
+                }
+            }
+        )*
+    };
+}
+
+// Make macro importable from elsewhere
+// See https://stackoverflow.com/a/31749071
+pub(crate) use packets;