zcash_client_backend: Improve type safety of `get_known_ephemeral_addresses`

zcash_client_backend/Cargo.toml

@@ -166,6 +166,7 @@ lightwalletd-tonic-transport = ["lightwalletd-tonic", "tonic?/transport"]
 ## Enables receiving transparent funds and shielding them.
 transparent-inputs = [
     "dep:bip32",
+    "transparent/transparent-inputs",
     "zcash_keys/transparent-inputs",
     "zcash_primitives/transparent-inputs",
 ]

zcash_client_backend/src/data_api.rs

@@ -74,15 +74,12 @@ use zcash_keys::{
         UnifiedAddressRequest, UnifiedFullViewingKey, UnifiedIncomingViewingKey, UnifiedSpendingKey,
     },
 };
-use zcash_primitives::{
-    block::BlockHash,
-    transaction::{Transaction, TxId},
-};
+use zcash_primitives::{block::BlockHash, transaction::Transaction};
 use zcash_protocol::{
     consensus::BlockHeight,
     memo::{Memo, MemoBytes},
     value::{BalanceError, Zatoshis},
-    ShieldedProtocol,
+    ShieldedProtocol, TxId,
 };
 use zip32::fingerprint::SeedFingerprint;
 
@@ -99,8 +96,8 @@ use crate::{
 #[cfg(feature = "transparent-inputs")]
 use {
     crate::wallet::TransparentAddressMetadata,
-    ::transparent::{address::TransparentAddress, bundle::OutPoint},
     std::ops::Range,
+    transparent::{address::TransparentAddress, bundle::OutPoint, keys::NonHardenedChildIndex},
 };
 
 #[cfg(feature = "test-dependencies")]
@@ -1465,7 +1462,7 @@ pub trait WalletRead {
     fn get_known_ephemeral_addresses(
         &self,
         _account: Self::AccountId,
-        _index_range: Option<Range<u32>>,
+        _index_range: Option<Range<NonHardenedChildIndex>>,
     ) -> Result<Vec<(TransparentAddress, TransparentAddressMetadata)>, Self::Error> {
         Ok(vec![])
     }

zcash_client_backend/src/data_api/testing.rs

@@ -8,11 +8,6 @@ use std::{
     num::NonZeroU32,
 };
 
-use ::sapling::{
-    note_encryption::{sapling_note_encryption, SaplingDomain},
-    util::generate_random_rseed,
-    zip32::DiversifiableFullViewingKey,
-};
 use assert_matches::assert_matches;
 use group::ff::Field;
 use incrementalmerkletree::{Marking, Retention};
@@ -23,6 +18,11 @@ use secrecy::{ExposeSecret, Secret, SecretVec};
 use shardtree::{error::ShardTreeError, store::memory::MemoryShardStore, ShardTree};
 use subtle::ConditionallySelectable;
 
+use ::sapling::{
+    note_encryption::{sapling_note_encryption, SaplingDomain},
+    util::generate_random_rseed,
+    zip32::DiversifiableFullViewingKey,
+};
 use zcash_address::ZcashAddress;
 use zcash_keys::{
     address::{Address, UnifiedAddress},
@@ -44,6 +44,21 @@ use zcash_protocol::{
 use zip32::{fingerprint::SeedFingerprint, DiversifierIndex};
 use zip321::Payment;
 
+use super::{
+    chain::{scan_cached_blocks, BlockSource, ChainState, CommitmentTreeRoot, ScanSummary},
+    error::Error,
+    scanning::ScanRange,
+    wallet::{
+        create_proposed_transactions,
+        input_selection::{GreedyInputSelector, InputSelector},
+        propose_standard_transfer_to_address, propose_transfer,
+    },
+    Account, AccountBalance, AccountBirthday, AccountMeta, AccountPurpose, AccountSource,
+    BlockMetadata, DecryptedTransaction, InputSource, NoteFilter, NullifierQuery, ScannedBlock,
+    SeedRelevance, SentTransaction, SpendableNotes, TransactionDataRequest, TransactionStatus,
+    WalletCommitmentTrees, WalletRead, WalletSummary, WalletTest, WalletWrite,
+    SAPLING_SHARD_HEIGHT,
+};
 use crate::{
     fees::{
         standard::{self, SingleOutputChangeStrategy},
@@ -56,26 +71,12 @@ use crate::{
     wallet::{Note, NoteId, OvkPolicy, ReceivedNote, WalletTransparentOutput},
 };
 
-use super::{
-    chain::{scan_cached_blocks, BlockSource, ChainState, CommitmentTreeRoot, ScanSummary},
-    scanning::ScanRange,
-    wallet::{
-        create_proposed_transactions,
-        input_selection::{GreedyInputSelector, InputSelector},
-        propose_standard_transfer_to_address, propose_transfer,
-    },
-    Account, AccountBalance, AccountBirthday, AccountMeta, AccountPurpose, AccountSource,
-    BlockMetadata, DecryptedTransaction, InputSource, NullifierQuery, ScannedBlock, SeedRelevance,
-    SentTransaction, SpendableNotes, TransactionDataRequest, TransactionStatus,
-    WalletCommitmentTrees, WalletRead, WalletSummary, WalletTest, WalletWrite,
-    SAPLING_SHARD_HEIGHT,
-};
-use super::{error::Error, NoteFilter};
-
 #[cfg(feature = "transparent-inputs")]
 use {
-    super::wallet::input_selection::ShieldingSelector, crate::wallet::TransparentAddressMetadata,
-    ::transparent::address::TransparentAddress, std::ops::Range,
+    super::wallet::input_selection::ShieldingSelector,
+    crate::wallet::TransparentAddressMetadata,
+    ::transparent::{address::TransparentAddress, keys::NonHardenedChildIndex},
+    std::ops::Range,
 };
 
 #[cfg(feature = "orchard")]
@@ -2624,7 +2625,7 @@ impl WalletRead for MockWalletDb {
     fn get_known_ephemeral_addresses(
         &self,
         _account: Self::AccountId,
-        _index_range: Option<Range<u32>>,
+        _index_range: Option<Range<NonHardenedChildIndex>>,
     ) -> Result<Vec<(TransparentAddress, TransparentAddressMetadata)>, Self::Error> {
         Ok(vec![])
     }

zcash_client_backend/src/data_api/testing/pool.rs

@@ -827,7 +827,13 @@ pub fn send_multi_step_proposed_transfer<T: ShieldedPoolTester, DSF>(
     // the start of the gap to index 12. This also tests the `index_range` parameter.
     let newer_known_addrs = st
         .wallet()
-        .get_known_ephemeral_addresses(account_id, Some(5..100))
+        .get_known_ephemeral_addresses(
+            account_id,
+            Some(
+                NonHardenedChildIndex::from_index(5).unwrap()
+                    ..NonHardenedChildIndex::from_index(100).unwrap(),
+            ),
+        )
         .unwrap();
     assert_eq!(newer_known_addrs.len(), (GAP_LIMIT as usize) + 12 - 5);
     assert!(newer_known_addrs.starts_with(&new_known_addrs[5..]));

zcash_client_sqlite/Cargo.toml

@@ -123,6 +123,7 @@ test-dependencies = [
 ## Enables receiving transparent funds and sending to transparent recipients
 transparent-inputs = [
   "dep:bip32",
+  "transparent/transparent-inputs",
   "zcash_keys/transparent-inputs",
   "zcash_client_backend/transparent-inputs"
 ]

zcash_client_sqlite/src/lib.rs

@@ -92,9 +92,9 @@ use {
 
 #[cfg(feature = "transparent-inputs")]
 use {
-    ::transparent::{address::TransparentAddress, bundle::OutPoint},
+    ::transparent::{address::TransparentAddress, bundle::OutPoint, keys::NonHardenedChildIndex},
     zcash_client_backend::wallet::TransparentAddressMetadata,
-    zcash_keys::encoding::AddressCodec as _,
+    zcash_keys::encoding::AddressCodec,
 };
 
 #[cfg(feature = "multicore")]
@@ -659,14 +659,14 @@ impl<C: Borrow<rusqlite::Connection>, P: consensus::Parameters> WalletRead for W
     fn get_known_ephemeral_addresses(
         &self,
         account: Self::AccountId,
-        index_range: Option<Range<u32>>,
+        index_range: Option<Range<NonHardenedChildIndex>>,
     ) -> Result<Vec<(TransparentAddress, TransparentAddressMetadata)>, Self::Error> {
         let account_id = wallet::get_account_ref(self.conn.borrow(), account)?;
         wallet::transparent::ephemeral::get_known_ephemeral_addresses(
             self.conn.borrow(),
             &self.params,
             account_id,
-            index_range,
+            index_range.map(|i| i.start.index()..i.end.index()),
         )
     }
 

zcash_client_sqlite/src/testing/db.rs

@@ -42,7 +42,7 @@ use crate::{
 #[cfg(feature = "transparent-inputs")]
 use {
     crate::TransparentAddressMetadata,
-    ::transparent::{address::TransparentAddress, bundle::OutPoint},
+    ::transparent::{address::TransparentAddress, bundle::OutPoint, keys::NonHardenedChildIndex},
     core::ops::Range,
 };