Add checking for equal message type UUIDspost-merge/message-type-registry

Signed-off-by: Matthias Beyer <matthias.beyer@ifm.com>

1 files changed, 23 insertions, 2 deletions

diff --git a/crates/core/tedge_core/src/lib.rs b/crates/core/tedge_core/src/lib.rs
index 43a80b49..dff1a238 100644
--- a/crates/core/tedge_core/src/lib.rs
+++ b/crates/core/tedge_core/src/lib.rs
@@ -191,8 +191,29 @@ impl TedgeApplicationBuilder {
             return self;
         }
 
-        self.message_types
-            .extend(handle_types.get_types().iter().cloned());
+        {
+            for message_type in handle_types.get_types().iter() {
+                if let Some(mt) = self
+                    .message_types
+                    .iter()
+                    .filter(|mt| mt.name() != message_type.name() && mt.eq_uuid(message_type))
+                    .next()
+                {
+                    self.errors
+                        .push(TedgeApplicationBuilderError::DuplicatedMessageUuid {
+                            first_message_name: mt.name(),
+                            second_message_name: message_type.name(),
+                            // SAFETY: Unwrap is safe because MessageType::eq_uuid() (used to fetch
+                            // `mt` here) only returns true if we have two MessageKind::Typed (with an
+                            // UUID). So MessageType::uuid() will here always return Some(_).
+                            uuid: mt.uuid().unwrap(),
+                        });
+                }
+            }
+            self.message_types
+                .extend(handle_types.get_types().iter().cloned());
+        }
+
         self.plugin_builders
             .insert(kind_name.to_string(), (handle_types, Box::new(builder)));
         self