WIP: Create an in-memory wallet backend.

Cargo.toml

@@ -15,7 +15,7 @@ members = [
 
 [workspace.package]
 edition = "2021"
-rust-version = "1.65"
+rust-version = "1.69"
 repository = "https://github.com/zcash/librustzcash"
 license = "MIT OR Apache-2.0"
 categories = ["cryptography::cryptocurrencies"]

rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.65.0"
+channel = "1.69.0"
 components = [ "clippy", "rustfmt" ]

zcash_client_backend/src/data_api.rs

@@ -44,6 +44,9 @@ pub mod error;
 pub mod scanning;
 pub mod wallet;
 
+#[cfg(any(test, feature = "test-dependencies"))]
+pub mod mem_wallet;
+
 /// The height of subtree roots in the Sapling note commitment tree.
 ///
 /// This conforms to the structure of subtree data returned by
@@ -1247,13 +1250,6 @@ pub mod testing {
             Ok(None)
         }
 
-        fn get_target_and_anchor_heights(
-            &self,
-            _min_confirmations: NonZeroU32,
-        ) -> Result<Option<(BlockHeight, BlockHeight)>, Self::Error> {
-            Ok(None)
-        }
-
         fn block_metadata(
             &self,
             _height: BlockHeight,
@@ -1273,6 +1269,13 @@ pub mod testing {
             Ok(vec![])
         }
 
+        fn get_target_and_anchor_heights(
+            &self,
+            _min_confirmations: NonZeroU32,
+        ) -> Result<Option<(BlockHeight, BlockHeight)>, Self::Error> {
+            Ok(None)
+        }
+
         fn get_min_unspent_height(&self) -> Result<Option<BlockHeight>, Self::Error> {
             Ok(None)
         }