Add `WalletRead::get_account_ids` function

.editorconfig

@@ -0,0 +1,7 @@
+# EditorConfig is awesome:http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*.md]
+indent_style = space

zcash_client_backend/CHANGELOG.md

@@ -140,6 +140,7 @@ and this library adheres to Rust's notion of
     - `get_spendable_sapling_notes`, `select_spendable_sapling_notes`, and
       `get_unspent_transparent_outputs` have been removed; use
       `data_api::InputSource` instead.
+    - Added `get_account_ids`
   - `wallet::{propose_shielding, shield_transparent_funds}` now takes their
     `min_confirmations` arguments as `u32` rather than a `NonZeroU32` to permit
     implmentations to enable zero-conf shielding.

zcash_client_backend/src/data_api.rs

@@ -560,6 +560,9 @@ pub trait WalletRead {
         account: AccountId,
         max_height: BlockHeight,
     ) -> Result<HashMap<TransparentAddress, Amount>, Self::Error>;
+
+    /// Returns a vector with the IDs of all accounts known to this wallet.
+    fn get_account_ids(&self) -> Result<Vec<AccountId>, Self::Error>;
 }
 
 /// Metadata describing the sizes of the zcash note commitment trees as of a particular block.
@@ -1283,6 +1286,10 @@ pub mod testing {
         ) -> Result<HashMap<TransparentAddress, Amount>, Self::Error> {
             Ok(HashMap::new())
         }
+
+        fn get_account_ids(&self) -> Result<Vec<AccountId>, Self::Error> {
+            Ok(Vec::new())
+        }
     }
 
     impl WalletWrite for MockWalletDb {

zcash_client_sqlite/src/lib.rs

@@ -372,6 +372,10 @@ impl<C: Borrow<rusqlite::Connection>, P: consensus::Parameters> WalletRead for W
     ) -> Result<Vec<(AccountId, orchard::note::Nullifier)>, Self::Error> {
         todo!()
     }
+
+    fn get_account_ids(&self) -> Result<Vec<AccountId>, Self::Error> {
+        wallet::get_account_ids(self.conn.borrow())
+    }
 }
 
 impl<P: consensus::Parameters> WalletWrite for WalletDb<rusqlite::Connection, P> {

zcash_client_sqlite/src/wallet.rs

@@ -1458,6 +1458,20 @@ pub(crate) fn get_transparent_balances<P: consensus::Parameters>(
     Ok(res)
 }
 
+/// Returns a vector with the IDs of all accounts known to this wallet.
+pub(crate) fn get_account_ids(conn: &rusqlite::Connection) -> Result<Vec<AccountId>, SqliteClientError> {
+    let mut stmt = conn.prepare("SELECT account FROM accounts")?;
+    let mut rows = stmt.query([])?;
+    let mut result = Vec::new();
+    while let Some(row) = rows.next()? {
+        let id: u32 = row.get(0)?;
+        result.push(AccountId::try_from(id).map_err(|_| {
+            SqliteClientError::CorruptedData("Account ID out of range".to_string())
+        })?);
+    }
+    Ok(result)
+}
+
 /// Inserts information about a scanned block into the database.
 pub(crate) fn put_block(
     conn: &rusqlite::Transaction<'_>,
@@ -2128,6 +2142,20 @@ mod tests {
         assert_matches!(res2, Err(_));
     }
 
+    #[test]
+    fn get_account_ids() {
+        use crate::testing::TestBuilder;
+
+        let st = TestBuilder::new()
+            .with_test_account(AccountBirthday::from_sapling_activation)
+            .build();
+
+        assert_eq!(
+            vec![AccountId::try_from(0).unwrap()],
+            st.wallet().get_account_ids().unwrap()
+        );
+    }
+
     #[test]
     #[cfg(feature = "transparent-inputs")]
     fn transparent_balance_across_shielding() {