# Changelog
All notable changes to this library will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this library adheres to Rust's notion of
[Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased]
### Changed
- MSRV is now 1.65.0.
- Bumped dependencies to `hdwallet 0.4`, `incrementalmerkletree 0.4`, `bs58 0.5`

### Removed
- The empty `wallet::transact` module has been removed.

## [0.7.1] - 2023-05-17

### Fixed
- Fixes a potential crash that could occur when attempting to read a memo from 
  sqlite when the memo value is `NULL`. At present, we return the empty memo
  in this case; in the future, the `get_memo` API will be updated to reflect
  the potential absence of memo data.

## [0.7.0] - 2023-04-28
### Changed
- Bumped dependencies to `zcash_client_backend 0.9`.

### Removed
- The following deprecated types and methods have been removed from the public API:
  - `wallet::ShieldedOutput`
  - `wallet::block_height_extrema`
  - `wallet::get_address`
  - `wallet::get_all_nullifiers`
  - `wallet::get_balance`
  - `wallet::get_balance_at`
  - `wallet::get_block_hash`
  - `wallet::get_commitment_tree`
  - `wallet::get_nullifiers`
  - `wallet::get_received_memo`
  - `wallet::get_rewind_height`
  - `wallet::get_sent_memo`
  - `wallet::get_spendable_sapling_notes`
  - `wallet::get_transaction`
  - `wallet::get_tx_height`
  - `wallet::get_unified_full_viewing_keys`
  - `wallet::get_witnesses`
  - `wallet::insert_block`
  - `wallet::insert_witnesses`
  - `wallet::is_valid_account_extfvk`
  - `wallet::mark_sapling_note_spent`
  - `wallet::put_tx_data`
  - `wallet::put_tx_meta`
  - `wallet::prune_witnesses`
  - `wallet::select_spendable_sapling_notes`
  - `wallet::update_expired_notes`
  - `wallet::transact::get_spendable_sapling_notes`
  - `wallet::transact::select_spendable_sapling_notes`

## [0.6.0] - 2023-04-15
### Added
- SQLite view `v_tx_outputs`, exposing the history of transaction outputs sent
  from and received by the wallet. See `zcash_client_sqlite::wallet` for view
  documentation.

### Fixed
- In a previous crate release, `WalletDb` was modified to start tracking Sapling
  change notes in both the `sent_notes` and `received_notes` tables, as a form
  of double-entry accounting. This broke assumptions in the `v_transactions`
  SQLite view, and also left the `sent_notes` table in an inconsistent state. A
  migration has been added to this release which fixes the `sent_notes` table to
  consistently store Sapling change notes.
- The SQLite view `v_transactions` had several bugs independently from the above
  issue, and has been rewritten. See `zcash_client_sqlite::wallet` for view
  documentation.

### Changed
- Bumped dependencies to `group 0.13`, `jubjub 0.10`, `zcash_primitives 0.11`,
  `zcash_client_backend 0.8`.
- The dependency on `zcash_primitives` no longer enables the `multicore` feature
  by default in order to support compilation under `wasm32-wasi`. Users of other
  platforms may need to include an explicit dependency on `zcash_primitives`
  without `default-features = false` or otherwise explicitly enable the
  `zcash_primitives/multicore` feature if they did not already depend
  upon `zcash_primitives` with default features enabled.

### Removed
- SQLite views `v_tx_received` and `v_tx_sent` (use `v_tx_outputs` instead).

## [0.5.0] - 2023-02-01
### Added
- `zcash_client_sqlite::FsBlockDb::rewind_to_height` rewinds the BlockMeta Db
 to the specified height following the same logic as homonymous functions on
 `WalletDb`. This function does not delete the files referenced by the rows
 that might be present and are deleted by this function call.
- `zcash_client_sqlite::FsBlockDb::find_block`
- `zcash_client_sqlite::chain`:
  - `impl {Clone, Copy, Debug, PartialEq, Eq} for BlockMeta`

### Changed
- MSRV is now 1.60.0.
- Bumped dependencies to `zcash_primitives 0.10`, `zcash_client_backend 0.7`.
- `zcash_client_backend::FsBlockDbError`:
  - Renamed `FsBlockDbError::{DbError, FsError}` to `FsBlockDbError::{Db, Fs}`.
  - Added `FsBlockDbError::MissingBlockPath`.
  - `impl fmt::Display for FsBlockDbError`

## [0.4.2] - 2022-12-13
### Fixed
- `zcash_client_sqlite::WalletDb::get_transparent_balances` no longer returns an
  error if the wallet has no UTXOs.

## [0.4.1] - 2022-12-06
### Added
- `zcash_client_sqlite::DataConnStmtCache::advance_by_block` now generates a
  `tracing` span, which can be used for profiling.

## [0.4.0] - 2022-11-12
### Added
- Implementations of `zcash_client_backend::data_api::WalletReadTransparent`
  and `WalletWriteTransparent` have been added. These implementations
  are available only when the `transparent-inputs` feature flag is
  enabled.
- New error variants:
  - `SqliteClientError::TransparentAddress`, to support handling of errors in
    transparent address decoding.
  - `SqliteClientError::RequestedRewindInvalid`, to report when requested
    rewinds exceed supported bounds.
  - `SqliteClientError::DiversifierIndexOutOfRange`, to report when the space
    of available diversifier indices has been exhausted.
  - `SqliteClientError::AccountIdDiscontinuity`, to report when a user attempts
    to initialize the accounts table with a noncontiguous set of account identifiers.
  - `SqliteClientError::AccountIdOutOfRange`, to report when the maximum account
    identifier has been reached.
  - `SqliteClientError::Protobuf`, to support handling of errors in serialized
    protobuf data decoding.
- An `unstable` feature flag; this is added to parts of the API that may change
  in any release. It enables `zcash_client_backend`'s `unstable` feature flag.
- New summary views that may be directly accessed in the sqlite database.
  The structure of these views should be considered unstable; they may
  be replaced by accessors provided by the data access API at some point
  in the future:
  - `v_transactions`
  - `v_tx_received`
  - `v_tx_sent`
- `zcash_client_sqlite::wallet::init::WalletMigrationError`
- A filesystem-backed `BlockSource` implementation
  `zcash_client_sqlite::FsBlockDb`. This block source expects blocks to be
  stored on disk in individual files named following the pattern
  `<blockmeta_root>/blocks/<blockheight>-<blockhash>-compactblock`. A SQLite
  database stored at `<blockmeta_root>/blockmeta.sqlite`stores metadata for
  this block source.
  - `zcash_client_sqlite::chain::init::init_blockmeta_db` creates the required
    metadata cache database.
- Implementations of `PartialEq`, `Eq`, `PartialOrd`, and `Ord` for `NoteId`

### Changed
- Various **BREAKING CHANGES** have been made to the database tables. These will
  require migrations, which may need to be performed in multiple steps. Migrations
  will now be automatically performed for any user using
  `zcash_client_sqlite::wallet::init_wallet_db` and it is recommended to use this
  method to maintain the state of the database going forward.
  - The `extfvk` column in the `accounts` table has been replaced by a `ufvk`
    column. Values for this column should be derived from the wallet's seed and
    the account number; the Sapling component of the resulting Unified Full
    Viewing Key should match the old value in the `extfvk` column.
  - The `address` and `transparent_address` columns of the `accounts` table have
    been removed.
    - A new `addresses` table stores Unified Addresses, keyed on their `account`
      and `diversifier_index`, to enable storing diversifed Unified Addresses.
    - Transparent addresses for an account should be obtained by extracting the
      transparent receiver of a Unified Address for the account.
  - A new non-null column, `output_pool` has been added to the `sent_notes`
    table to enable distinguishing between Sapling and transparent outputs
    (and in the future, outputs to other pools). Values for this column should
    be assigned by inference from the address type in the stored data.
- MSRV is now 1.56.1.
- Bumped dependencies to `ff 0.12`, `group 0.12`, `jubjub 0.9`,
  `zcash_primitives 0.9`, `zcash_client_backend 0.6`.
- Renamed the following to use lower-case abbreviations (matching Rust
  naming conventions):
  - `zcash_client_sqlite::BlockDB` to `BlockDb`
  - `zcash_client_sqlite::WalletDB` to `WalletDb`
  - `zcash_client_sqlite::error::SqliteClientError::IncorrectHRPExtFVK` to
    `IncorrectHrpExtFvk`.
- The SQLite implementations of `zcash_client_backend::data_api::WalletRead`
  and `WalletWrite` have been updated to reflect the changes to those
  traits.
- `zcash_client_sqlite::wallet`:
  - `get_spendable_notes` has been renamed to `get_spendable_sapling_notes`.
  - `select_spendable_notes` has been renamed to `select_spendable_sapling_notes`.
  - `get_spendable_sapling_notes` and `select_spendable_sapling_notes` have also
    been changed to take a parameter that permits the caller to specify a set of
    notes to exclude from consideration.
  - `init_wallet_db` has been modified to take the wallet seed as an argument so
    that it can correctly perform migrations that require re-deriving key
    material. In particular for this upgrade, the seed is used to derive UFVKs
    to replace the currently stored Sapling ExtFVKs (without losing information)
    as part of the migration process.

### Removed
- The following functions have been removed from the public interface of
  `zcash_client_sqlite::wallet`. Prefer methods defined on
  `zcash_client_backend::data_api::{WalletRead, WalletWrite}` instead.
  - `get_extended_full_viewing_keys` (use `WalletRead::get_unified_full_viewing_keys` instead).
  - `insert_sent_note` (use `WalletWrite::store_sent_tx` instead).
  - `insert_sent_utxo` (use `WalletWrite::store_sent_tx` instead).
  - `put_sent_note` (use `WalletWrite::store_decrypted_tx` instead).
  - `put_sent_utxo` (use `WalletWrite::store_decrypted_tx` instead).
  - `delete_utxos_above` (use `WalletWrite::rewind_to_height` instead).
- `zcash_client_sqlite::with_blocks` (use
  `zcash_client_backend::data_api::BlockSource::with_blocks` instead).
- `zcash_client_sqlite::error::SqliteClientError` variants:
  - `SqliteClientError::IncorrectHrpExtFvk`
  - `SqliteClientError::Base58`
  - `SqliteClientError::BackendError`

### Fixed
- The `zcash_client_backend::data_api::WalletRead::get_address` implementation
  for `zcash_client_sqlite::WalletDb` now correctly returns `Ok(None)` if the
  account identifier does not correspond to a known account.

### Deprecated
- A number of public API methods that are used internally to support the
  `zcash_client_backend::data_api::{WalletRead, WalletWrite}` interfaces have
  been deprecated, and will be removed from the public API in a future release.
  Users should depend upon the versions of these methods exposed via the
  `zcash_client_backend::data_api` traits mentioned above instead.
  - Deprecated in `zcash_client_sqlite::wallet`:
    - `get_address`
    - `is_valid_account_extfvk`
    - `get_balance`
    - `get_balance_at`
    - `get_sent_memo`
    - `block_height_extrema`
    - `get_tx_height`
    - `get_block_hash`
    - `get_rewind_height`
    - `get_commitment_tree`
    - `get_witnesses`
    - `get_nullifiers`
    - `insert_block`
    - `put_tx_meta`
    - `put_tx_data`
    - `mark_sapling_note_spent`
    - `put_receiverd_note`
    - `insert_witness`
    - `prune_witnesses`
    - `update_expired_notes`
    - `get_address`
  - Deprecated in `zcash_client_sqlite::wallet::transact`:
    - `get_spendable_sapling_notes`
    - `select_spendable_sapling_notes`

## [0.3.0] - 2021-03-26
This release contains a major refactor of the APIs to leverage the new Data
Access API in the `zcash_client_backend` crate. API names are almost all the
same as before, but have been reorganized.

### Added
- `zcash_client_sqlite::BlockDB`, a read-only wrapper for the SQLite connection
  to the block cache database.
- `zcash_client_sqlite::WalletDB`, a read-only wrapper for the SQLite connection
  to the wallet database.
- `zcash_client_sqlite::DataConnStmtCache`, a read-write wrapper for the SQLite
  connection to the wallet database. Returned by `WalletDB::get_update_ops`.
- `zcash_client_sqlite::NoteId`

### Changed
- MSRV is now 1.47.0.
- APIs now take `&BlockDB` and `&WalletDB<P>` arguments, instead of paths to the
  block cache and wallet databases.
- The library no longer uses the `mainnet` feature flag to specify the network
  type. APIs now take a `P: zcash_primitives::consensus::Parameters` variable.

### Removed
- `zcash_client_sqlite::address` module (moved to `zcash_client_backend`).

### Fixed
- Shielded transactions created by the wallet that have no change output (fully
  spending their input notes) are now correctly detected as mined when scanning
  compact blocks.
- Unshielding transactions created by the wallet (with a transparent recipient
  address) that have no change output no longer cause a panic.

## [0.2.1] - 2020-10-24
### Fixed
- `transact::create_to_address` now correctly reconstructs notes from the data
  DB after Canopy activation (zcash/librustzcash#311). This is critcal to correct
  operation of spends after Canopy.

## [0.2.0] - 2020-09-09
### Changed
- MSRV is now 1.44.1.
- Bumped dependencies to `ff 0.8`, `group 0.8`, `jubjub 0.5.1`, `protobuf 2.15`,
  `rusqlite 0.24`, `zcash_primitives 0.4`, `zcash_client_backend 0.4`.

## [0.1.0] - 2020-08-24
Initial release.