add implementations of InputSource for MemoryWalletDB and Conditional…

…lySelectable for AccountId

zcash_client_memory/src/mem_wallet/input_source.rs

@@ -0,0 +1,37 @@
+use zcash_client_backend::data_api::InputSource;
+
+use crate::mem_wallet::{AccountId, MemoryWalletDb};
+
+impl InputSource for MemoryWalletDb {
+    type Error = crate::error::Error;
+    type AccountId = crate::mem_wallet::AccountId;
+    type NoteRef = crate::mem_wallet::NoteId;
+
+    fn get_spendable_note(
+        &self,
+        txid: &zcash_primitives::transaction::TxId,
+        protocol: zcash_protocol::ShieldedProtocol,
+        index: u32,
+    ) -> Result<
+        Option<
+            zcash_client_backend::wallet::ReceivedNote<
+                Self::NoteRef,
+                zcash_client_backend::wallet::Note,
+            >,
+        >,
+        Self::Error,
+    > {
+        todo!()
+    }
+
+    fn select_spendable_notes(
+        &self,
+        account: Self::AccountId,
+        target_value: zcash_protocol::value::Zatoshis,
+        sources: &[zcash_protocol::ShieldedProtocol],
+        anchor_height: zcash_protocol::consensus::BlockHeight,
+        exclude: &[Self::NoteRef],
+    ) -> Result<zcash_client_backend::data_api::SpendableNotes<Self::NoteRef>, Self::Error> {
+        todo!()
+    }
+}

zcash_client_memory/src/mem_wallet/mod.rs

@@ -12,6 +12,7 @@ use std::{
     num::NonZeroU32,
     ops::Deref,
 };
+use subtle::ConditionallySelectable;
 use zcash_keys::keys::{AddressGenerationError, DerivationError, UnifiedIncomingViewingKey};
 use zip32::{fingerprint::SeedFingerprint, DiversifierIndex, Scope};
 
@@ -55,6 +56,7 @@ use zcash_client_backend::{data_api::ORCHARD_SHARD_HEIGHT, wallet::WalletOrchard
 
 use crate::error::Error;
 
+mod input_source;
 mod tables;
 mod wallet_commitment_trees;
 mod wallet_read;
@@ -280,6 +282,14 @@ impl Deref for AccountId {
     }
 }
 
+impl ConditionallySelectable for AccountId {
+    fn conditional_select(a: &Self, b: &Self, choice: subtle::Choice) -> Self {
+        AccountId(ConditionallySelectable::conditional_select(
+            &a.0, &b.0, choice,
+        ))
+    }
+}
+
 /// An account stored in a `zcash_client_sqlite` database.
 #[derive(Debug, Clone)]
 pub struct Account {