Create fee.rs

Author: iamfurydammit

src/fee.rs

@@ -0,0 +1,20 @@
+/// Represents the context of a protocol-defined "use"
+#[derive(Debug, Clone)]
+pub struct UseContext {
+    pub intent_id: String,
+    pub from_state: String,
+    pub to_state: String,
+    pub timestamp_unix: u64,
+}
+
+/// Represents a record that a usage event was registered
+#[derive(Debug, Clone)]
+pub struct FeeReceipt {
+    pub context_hash: String,
+}
+
+/// Abstract sink for recording protocol usage
+pub trait FeeSink {
+    /// Record a single protocol-defined "use"
+    fn record_use(&self, context: &UseContext) -> FeeReceipt;
+}