feat: Add utility methods to CallResponse (#579)

ic-transport-types/src/lib.rs

@@ -138,7 +138,7 @@ pub enum TransportCallResponse {
 }
 
 /// The response from a request to the `call` endpoint.
-#[derive(Debug, PartialEq, Eq)]
+#[derive(Debug, PartialEq, Eq, Clone, Hash)]
 pub enum CallResponse<Out> {
     /// The call completed, and the response is available.
     Response(Out),
@@ -147,6 +147,50 @@ pub enum CallResponse<Out> {
     Poll(RequestId),
 }
 
+impl<Out> CallResponse<Out> {
+    /// Maps the inner value, if this is `Response`.
+    #[inline]
+    pub fn map<Out2>(self, f: impl FnOnce(Out) -> Out2) -> CallResponse<Out2> {
+        match self {
+            Self::Poll(p) => CallResponse::Poll(p),
+            Self::Response(r) => CallResponse::Response(f(r)),
+        }
+    }
+}
+
+impl<T, E> CallResponse<Result<T, E>> {
+    /// Extracts an inner `Result`, if this is `Response`.
+    #[inline]
+    pub fn transpose(self) -> Result<CallResponse<T>, E> {
+        match self {
+            Self::Poll(p) => Ok(CallResponse::Poll(p)),
+            Self::Response(r) => r.map(CallResponse::Response),
+        }
+    }
+}
+
+impl<T> CallResponse<Option<T>> {
+    /// Extracts an inner `Option`, if this is `Response`.
+    #[inline]
+    pub fn transpose(self) -> Option<CallResponse<T>> {
+        match self {
+            Self::Poll(p) => Some(CallResponse::Poll(p)),
+            Self::Response(r) => r.map(CallResponse::Response),
+        }
+    }
+}
+
+impl<T> CallResponse<(T,)> {
+    /// Extracts the inner value of a 1-tuple, if this is `Response`.`
+    #[inline]
+    pub fn detuple(self) -> CallResponse<T> {
+        match self {
+            Self::Poll(p) => CallResponse::Poll(p),
+            Self::Response(r) => CallResponse::Response(r.0),
+        }
+    }
+}
+
 /// Possible responses to a query call.
 #[derive(Debug, Clone, Deserialize, Serialize)]
 #[serde(tag = "status", rename_all = "snake_case")]

ic-transport-types/src/request_id.rs

@@ -51,7 +51,7 @@ where
 }
 
 /// A Request ID.
-#[derive(Clone, Copy, Debug, PartialOrd, Ord, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, PartialOrd, Ord, PartialEq, Eq, Hash)]
 pub struct RequestId(Sha256Hash);
 
 impl RequestId {