1 files changed, 53 insertions, 0 deletions
diff --git a/third_party/rust/glean-core/src/traits/object.rs b/third_party/rust/glean-core/src/traits/object.rs
new file mode 100644
index 0000000000..c579efeac7
--- /dev/null
+++ b/third_party/rust/glean-core/src/traits/object.rs
@@ -0,0 +1,53 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+use std::fmt::Display;
+
+use serde::{Deserialize, Serialize};
+use serde_json::Value as JsonValue;
+
+/// This type represents all possible errors that can occur when serializing or deserializing an object from/to JSON.
+#[derive(Debug)]
+pub struct ObjectError(serde_json::Error);
+
+impl Display for ObjectError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        Display::fmt(&self.0, f)
+    }
+}
+
+impl std::error::Error for ObjectError {}
+
+/// An object that can be serialized into JSON.
+///
+/// Objects are defined by their structure in the metrics definition.
+///
+/// This is essentially a wrapper around serde's `Serialize`/`Deserialize`,
+/// but in a way we can name it for our JSON (de)serialization.
+pub trait ObjectSerialize {
+    /// Deserialize the object from its JSON representation.
+    ///
+    /// Returns an error if deserialization fails.
+    /// This should not happen for glean_parser-generated and later serialized objects.
+    fn from_str(obj: &str) -> Result<Self, ObjectError>
+    where
+        Self: Sized;
+
+    /// Serialize this object into a JSON string.
+    fn into_serialized_object(self) -> Result<JsonValue, ObjectError>;
+}
+
+impl<V> ObjectSerialize for V
+where
+    V: Serialize,
+    V: for<'de> Deserialize<'de>,
+{
+    fn from_str(obj: &str) -> Result<Self, ObjectError> {
+        serde_json::from_str(obj).map_err(ObjectError)
+    }
+
+    fn into_serialized_object(self) -> Result<JsonValue, ObjectError> {
+        serde_json::to_value(self).map_err(ObjectError)
+    }
+}