Fault-tolerant delivery system

src/idempotency/key.rs

@@ -0,0 +1,28 @@
+pub struct IdempotencyKey(String);
+
+impl TryFrom<String> for IdempotencyKey {
+    type Error = String;
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        if value.is_empty() {
+            return Err("The idempotency key cannot be empty.".into());
+        }
+        let max_length = 50;
+        if value.len() >= max_length {
+            return Err("The idempotency key must be shorter than {max_length} characters.".into());
+        }
+        Ok(Self(value))
+    }
+}
+
+impl From<IdempotencyKey> for String {
+    fn from(value: IdempotencyKey) -> Self {
+        value.0
+    }
+}
+
+impl AsRef<str> for IdempotencyKey {
+    fn as_ref(&self) -> &str {
+        &self.0
+    }
+}