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Merge pull request #761 from nuttycom/wallet/expose_transaction_propose 

Factor out a transaction proposal API from `spend`.
This commit is contained in:
str4d 2023-02-01 00:51:31 +00:00 committed by GitHub
parent 756f388e00 4fafd14d17
commit b6f7ff06ed
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 295 additions and 199 deletions
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6
zcash_client_backend/CHANGELOG.md
View File

@ -7,6 +7,12 @@ and this library adheres to Rust's notion of
## [Unreleased]
### Added
- `zcash_client_backend::data_api::wallet`:
- `propose_transfer`
- `propose_shielding`
- `create_proposed_transaction`
### Changed
- MSRV is now 1.60.0.

377
zcash_client_backend/src/data_api/wallet.rs
View File

@ -1,3 +1,4 @@
use std::convert::Infallible;
use std::fmt::Debug;
use zcash_primitives::{
@ -11,14 +12,14 @@ use zcash_primitives::{
fees::{fixed, FeeRule},
Transaction,
},
zip32::{sapling::DiversifiableFullViewingKey, sapling::ExtendedSpendingKey, Scope},
zip32::{sapling::DiversifiableFullViewingKey, sapling::ExtendedSpendingKey, AccountId, Scope},
};
use crate::{
address::RecipientAddress,
data_api::{
error::Error, DecryptedTransaction, PoolType, Recipient, SentTransaction,
SentTransactionOutput, WalletWrite,
error::Error, wallet::input_selection::Proposal, DecryptedTransaction, PoolType, Recipient,
SentTransaction, SentTransactionOutput, WalletWrite,
},
decrypt_transaction,
fees::{self, ChangeValue, DustOutputPolicy},
@ -31,9 +32,12 @@ pub mod input_selection;
use input_selection::{GreedyInputSelector, GreedyInputSelectorError, InputSelector};
#[cfg(feature = "transparent-inputs")]
use zcash_primitives::{
use {
crate::wallet::WalletTransparentOutput,
zcash_primitives::{
legacy::TransparentAddress, sapling::keys::OutgoingViewingKey,
transaction::components::amount::NonNegativeAmount,
},
};
/// Scans a [`Transaction`] for any information that can be decrypted by the accounts in
@ -192,7 +196,7 @@ pub fn create_spend_to_address<DbT, ParamsT>(
Error<
DbT::Error,
GreedyInputSelectorError<BalanceError, DbT::NoteRef>,
core::convert::Infallible,
Infallible,
DbT::NoteRef,
>,
>
@ -302,33 +306,153 @@ where
.map_err(Error::DataSource)?
.ok_or(Error::KeyNotRecognized)?;
let dfvk = usk.sapling().to_diversifiable_full_viewing_key();
let proposal = propose_transfer(
wallet_db,
params,
account,
input_selector,
request,
min_confirmations,
)?;
// Apply the outgoing viewing key policy.
let ovk = match ovk_policy {
OvkPolicy::Sender => Some(dfvk.fvk().ovk),
OvkPolicy::Custom(ovk) => Some(ovk),
OvkPolicy::Discard => None,
};
create_proposed_transaction(wallet_db, params, prover, usk, ovk_policy, proposal, None)
}
/// Select transaction inputs, compute fees, and construct a proposal for a transaction
/// that can then be authorized and made ready for submission to the network with
/// [`create_proposed_transaction`].
#[allow(clippy::too_many_arguments)]
#[allow(clippy::type_complexity)]
pub fn propose_transfer<DbT, ParamsT, InputsT>(
wallet_db: &mut DbT,
params: &ParamsT,
spend_from_account: AccountId,
input_selector: &InputsT,
request: zip321::TransactionRequest,
min_confirmations: u32,
) -> Result<
Proposal<InputsT::FeeRule, DbT::NoteRef>,
Error<DbT::Error, InputsT::Error, <InputsT::FeeRule as FeeRule>::Error, DbT::NoteRef>,
>
where
DbT: WalletWrite,
DbT::NoteRef: Copy + Eq + Ord,
ParamsT: consensus::Parameters + Clone,
InputsT: InputSelector<DataSource = DbT>,
{
// Target the next block, assuming we are up-to-date.
let (target_height, anchor_height) = wallet_db
.get_target_and_anchor_heights(min_confirmations)
.map_err(Error::DataSource)
.and_then(|x| x.ok_or(Error::ScanRequired))?;
let proposal = input_selector.propose_transaction(
input_selector
.propose_transaction(
params,
wallet_db,
account,
spend_from_account,
anchor_height,
target_height,
request,
)?;
)
.map_err(Error::from)
}
#[cfg(feature = "transparent-inputs")]
#[allow(clippy::too_many_arguments)]
#[allow(clippy::type_complexity)]
pub fn propose_shielding<DbT, ParamsT, InputsT>(
wallet_db: &mut DbT,
params: &ParamsT,
input_selector: &InputsT,
shielding_threshold: NonNegativeAmount,
from_addrs: &[TransparentAddress],
min_confirmations: u32,
) -> Result<
Proposal<InputsT::FeeRule, DbT::NoteRef>,
Error<DbT::Error, InputsT::Error, <InputsT::FeeRule as FeeRule>::Error, DbT::NoteRef>,
>
where
ParamsT: consensus::Parameters,
DbT: WalletWrite,
DbT::NoteRef: Copy + Eq + Ord,
InputsT: InputSelector<DataSource = DbT>,
{
let (target_height, latest_anchor) = wallet_db
.get_target_and_anchor_heights(min_confirmations)
.map_err(Error::DataSource)
.and_then(|x| x.ok_or(Error::ScanRequired))?;
input_selector
.propose_shielding(
params,
wallet_db,
shielding_threshold,
from_addrs,
latest_anchor,
target_height,
)
.map_err(Error::from)
}
/// Construct, prove, and sign a transaction using the inputs supplied by the given proposal,
/// and persist it to the wallet database.
///
/// Returns the database identifier for the newly constructed transaction, or an error if
/// an error occurs in transaction construction, proving, or signing.
#[allow(clippy::too_many_arguments)]
#[allow(clippy::type_complexity)]
pub fn create_proposed_transaction<DbT, ParamsT, InputsErrT, FeeRuleT>(
wallet_db: &mut DbT,
params: &ParamsT,
prover: impl SaplingProver,
usk: &UnifiedSpendingKey,
ovk_policy: OvkPolicy,
proposal: Proposal<FeeRuleT, DbT::NoteRef>,
change_memo: Option<MemoBytes>,
) -> Result<DbT::TxRef, Error<DbT::Error, InputsErrT, FeeRuleT::Error, DbT::NoteRef>>
where
DbT: WalletWrite,
DbT::TxRef: Copy + Debug,
DbT::NoteRef: Copy + Eq + Ord,
ParamsT: consensus::Parameters + Clone,
FeeRuleT: FeeRule,
{
let account = wallet_db
.get_account_for_ufvk(&usk.to_unified_full_viewing_key())
.map_err(Error::DataSource)?
.ok_or(Error::KeyNotRecognized)?;
let dfvk = usk.sapling().to_diversifiable_full_viewing_key();
// Apply the outgoing viewing key policy.
let external_ovk = match ovk_policy {
OvkPolicy::Sender => Some(dfvk.to_ovk(Scope::External)),
OvkPolicy::Custom(ovk) => Some(ovk),
OvkPolicy::Discard => None,
};
let internal_ovk = || {
#[cfg(feature = "transparent-inputs")]
return if proposal.is_shielding() {
Some(OutgoingViewingKey(
usk.transparent()
.to_account_pubkey()
.internal_ovk()
.as_bytes(),
))
} else {
Some(dfvk.to_ovk(Scope::Internal))
};
#[cfg(not(feature = "transparent-inputs"))]
Some(dfvk.to_ovk(Scope::Internal))
};
// Create the transaction. The type of the proposal ensures that there
// are no possible transparent inputs, so we ignore those
let mut builder = Builder::new(params.clone(), target_height);
let mut builder = Builder::new(params.clone(), proposal.target_height());
for selected in proposal.sapling_inputs() {
let (note, key, merkle_path) = select_key_for_note(selected, usk.sapling(), &dfvk)
.ok_or(Error::NoteMismatch(selected.note_id))?;
@ -336,23 +460,67 @@ where
builder.add_sapling_spend(key, selected.diversifier, note, merkle_path)?;
}
#[cfg(feature = "transparent-inputs")]
let utxos = {
let known_addrs = wallet_db
.get_transparent_receivers(account)
.map_err(Error::DataSource)?;
let mut utxos: Vec<WalletTransparentOutput> = vec![];
for utxo in proposal.transparent_inputs() {
utxos.push(utxo.clone());
let diversifier_index = known_addrs
.get(utxo.recipient_address())
.ok_or_else(|| Error::AddressNotRecognized(*utxo.recipient_address()))?
.diversifier_index();
let child_index = u32::try_from(*diversifier_index)
.map_err(|_| Error::ChildIndexOutOfRange(*diversifier_index))?;
let secret_key = usk
.transparent()
.derive_external_secret_key(child_index)
.unwrap();
builder.add_transparent_input(
secret_key,
utxo.outpoint().clone(),
utxo.txout().clone(),
)?;
}
utxos
};
let mut sapling_output_meta = vec![];
let mut transparent_output_meta = vec![];
for payment in proposal.transaction_request().payments() {
match &payment.recipient_address {
RecipientAddress::Unified(ua) => {
builder.add_sapling_output(
ovk,
external_ovk,
*ua.sapling().expect("TODO: Add Orchard support to builder"),
payment.amount,
payment.memo.clone().unwrap_or_else(MemoBytes::empty),
)?;
sapling_output_meta.push((
Recipient::Unified(ua.clone(), PoolType::Sapling),
payment.amount,
payment.memo.clone(),
));
}
RecipientAddress::Shielded(to) => {
RecipientAddress::Shielded(addr) => {
builder.add_sapling_output(
ovk,
*to,
external_ovk,
*addr,
payment.amount,
payment.memo.clone().unwrap_or_else(MemoBytes::empty),
)?;
sapling_output_meta.push((
Recipient::Sapling(*addr),
payment.amount,
payment.memo.clone(),
));
}
RecipientAddress::Transparent(to) => {
if payment.memo.is_some() {
@ -360,6 +528,7 @@ where
} else {
builder.add_transparent_output(to, payment.amount)?;
}
transparent_output_meta.push((*to, payment.amount));
}
}
}
@ -368,33 +537,44 @@ where
match change_value {
ChangeValue::Sapling(amount) => {
builder.add_sapling_output(
Some(dfvk.to_ovk(Scope::Internal)),
internal_ovk(),
dfvk.change_address().1,
*amount,
MemoBytes::empty(),
)?;
sapling_output_meta.push((
Recipient::InternalAccount(account, PoolType::Sapling),
*amount,
change_memo.clone(),
))
}
}
}
let (tx, tx_metadata) = builder.build(&prover, proposal.fee_rule())?;
// Build the transaction with the specified fee rule
let (tx, sapling_build_meta) = builder.build(&prover, proposal.fee_rule())?;
let sent_outputs = proposal.transaction_request().payments().iter().enumerate().map(|(i, payment)| {
let (output_index, recipient) = match &payment.recipient_address {
// Sapling outputs are shuffled, so we need to look up where the output ended up.
RecipientAddress::Shielded(addr) => {
let idx = tx_metadata.output_index(i).expect("An output should exist in the transaction for each shielded payment.");
(idx, Recipient::Sapling(*addr))
let sapling_outputs =
sapling_output_meta
.into_iter()
.enumerate()
.map(|(i, (recipient, value, memo))| {
let output_index = sapling_build_meta
.output_index(i)
.expect("An output should exist in the transaction for each shielded payment.");
SentTransactionOutput {
output_index,
recipient,
value,
memo,
}
RecipientAddress::Unified(addr) => {
// TODO: When we add Orchard support, we will need to trial-decrypt to find them,
// and return the appropriate pool type.
let idx = tx_metadata.output_index(i).expect("An output should exist in the transaction for each shielded payment.");
(idx, Recipient::Unified(addr.clone(), PoolType::Sapling))
}
RecipientAddress::Transparent(addr) => {
});
let transparent_outputs = transparent_output_meta.into_iter().map(|(addr, value)| {
let script = addr.script();
let idx = tx.transparent_bundle()
let output_index = tx
.transparent_bundle()
.and_then(|b| {
b.vout
.iter()
@ -404,27 +584,23 @@ where
.map(|(index, _)| index)
.expect("An output should exist in the transaction for each transparent payment.");
(idx, Recipient::Transparent(*addr))
}
};
SentTransactionOutput {
output_index,
recipient,
value: payment.amount,
memo: payment.memo.clone()
recipient: Recipient::Transparent(addr),
value,
memo: None,
}
}).collect();
});
wallet_db
.store_sent_tx(&SentTransaction {
tx: &tx,
created: time::OffsetDateTime::now_utc(),
account,
outputs: sent_outputs,
outputs: sapling_outputs.chain(transparent_outputs).collect(),
fee_amount: proposal.balance().fee_required(),
#[cfg(feature = "transparent-inputs")]
utxos_spent: vec![],
utxos_spent: utxos.iter().map(|utxo| utxo.outpoint().clone()).collect(),
})
.map_err(Error::DataSource)
}
@ -484,107 +660,24 @@ where
DbT::NoteRef: Copy + Eq + Ord,
InputsT: InputSelector<DataSource = DbT>,
{
let account = wallet_db
.get_account_for_ufvk(&usk.to_unified_full_viewing_key())
.map_err(Error::DataSource)?
.ok_or(Error::KeyNotRecognized)?;
let shielding_address = usk
.sapling()
.to_diversifiable_full_viewing_key()
.change_address()
.1;
let (target_height, latest_anchor) = wallet_db
.get_target_and_anchor_heights(min_confirmations)
.map_err(Error::DataSource)
.and_then(|x| x.ok_or(Error::ScanRequired))?;
let dfvk = usk.sapling().to_diversifiable_full_viewing_key();
let account_pubkey = usk.transparent().to_account_pubkey();
let ovk = OutgoingViewingKey(account_pubkey.internal_ovk().as_bytes());
// get UTXOs from DB for each address
let proposal = input_selector.propose_shielding(
params,
let proposal = propose_shielding(
wallet_db,
params,
input_selector,
shielding_threshold,
from_addrs,
latest_anchor,
target_height,
min_confirmations,
)?;
let known_addrs = wallet_db
.get_transparent_receivers(account)
.map_err(Error::DataSource)?;
let mut builder = Builder::new(params.clone(), target_height);
let mut utxos = vec![];
for selected in proposal.sapling_inputs() {
let (note, key, merkle_path) = select_key_for_note(selected, usk.sapling(), &dfvk)
.ok_or(Error::NoteMismatch(selected.note_id))?;
builder.add_sapling_spend(key, selected.diversifier, note, merkle_path)?;
}
for utxo in proposal.transparent_inputs() {
utxos.push(utxo);
let diversifier_index = known_addrs
.get(utxo.recipient_address())
.ok_or_else(|| Error::AddressNotRecognized(*utxo.recipient_address()))?
.diversifier_index();
let child_index = u32::try_from(*diversifier_index)
.map_err(|_| Error::ChildIndexOutOfRange(*diversifier_index))?;
let secret_key = usk
.transparent()
.derive_external_secret_key(child_index)
.unwrap();
builder.add_transparent_input(secret_key, utxo.outpoint().clone(), utxo.txout().clone())?;
}
for change_value in proposal.balance().proposed_change() {
match change_value {
ChangeValue::Sapling(amount) => {
builder.add_sapling_output(Some(ovk), shielding_address, *amount, memo.clone())?;
}
}
}
// The transaction build process will check that the inputs and outputs balance
let (tx, tx_metadata) = builder.build(&prover, proposal.fee_rule())?;
wallet_db
.store_sent_tx(&SentTransaction {
tx: &tx,
created: time::OffsetDateTime::now_utc(),
account,
// TODO: After Orchard is implemented, this will need to change to correctly
// determine the Sapling output indices; `enumerate` will no longer suffice
outputs: proposal
.balance()
.proposed_change()
.iter()
.enumerate()
.map(|(idx, change_value)| match change_value {
ChangeValue::Sapling(value) => {
let output_index = tx_metadata.output_index(idx).expect(
"Missing Sapling output of autoshielding transaction. This is a programming error.",
);
SentTransactionOutput {
output_index,
recipient: Recipient::InternalAccount(account, PoolType::Sapling),
value: *value,
memo: Some(memo.clone()),
}
}
})
.collect(),
fee_amount: proposal.balance().fee_required(),
utxos_spent: utxos.iter().map(|utxo| utxo.outpoint().clone()).collect(),
})
.map_err(Error::DataSource)
create_proposed_transaction(
wallet_db,
params,
prover,
usk,
OvkPolicy::Sender,
proposal,
Some(memo.clone()),
)
}
fn select_key_for_note<N>(

46
zcash_client_backend/src/data_api/wallet/input_selection.rs
View File

@ -65,21 +65,23 @@ impl<DE: fmt::Display, SE: fmt::Display> fmt::Display for InputSelectorError<DE,
/// A data structure that describes the inputs to be consumed and outputs to
/// be produced in a proposed transaction.
pub struct Proposal<FeeRuleT, TransparentInput, NoteRef> {
pub struct Proposal<FeeRuleT, NoteRef> {
transaction_request: TransactionRequest,
transparent_inputs: Vec<TransparentInput>,
transparent_inputs: Vec<WalletTransparentOutput>,
sapling_inputs: Vec<SpendableNote<NoteRef>>,
balance: TransactionBalance,
fee_rule: FeeRuleT,
target_height: BlockHeight,
is_shielding: bool,
}
impl<FeeRuleT, TransparentInput, NoteRef> Proposal<FeeRuleT, TransparentInput, NoteRef> {
impl<FeeRuleT, NoteRef> Proposal<FeeRuleT, NoteRef> {
/// Returns the transaction request that describes the payments to be made.
pub fn transaction_request(&self) -> &TransactionRequest {
&self.transaction_request
}
/// Returns the transparent inputs that have been selected to fund the transaction.
pub fn transparent_inputs(&self) -> &[TransparentInput] {
pub fn transparent_inputs(&self) -> &[WalletTransparentOutput] {
&self.transparent_inputs
}
/// Returns the Sapling inputs that have been selected to fund the transaction.
@ -94,6 +96,16 @@ impl<FeeRuleT, TransparentInput, NoteRef> Proposal<FeeRuleT, TransparentInput, N
pub fn fee_rule(&self) -> &FeeRuleT {
&self.fee_rule
}
/// Returns the target height for which the proposal was prepared.
pub fn target_height(&self) -> BlockHeight {
self.target_height
}
/// Returns a flag indicating whether or not the proposed transaction
/// is exclusively wallet-internal (if it does not involve any external
/// recipients).
pub fn is_shielding(&self) -> bool {
self.is_shielding
}
}
/// A strategy for selecting transaction inputs and proposing transaction outputs.
@ -138,11 +150,7 @@ pub trait InputSelector {
target_height: BlockHeight,
transaction_request: TransactionRequest,
) -> Result<
Proposal<
Self::FeeRule,
std::convert::Infallible,
<<Self as InputSelector>::DataSource as WalletRead>::NoteRef,
>,
Proposal<Self::FeeRule, <<Self as InputSelector>::DataSource as WalletRead>::NoteRef>,
InputSelectorError<<<Self as InputSelector>::DataSource as WalletRead>::Error, Self::Error>,
>
where
@ -167,11 +175,7 @@ pub trait InputSelector {
confirmed_height: BlockHeight,
target_height: BlockHeight,
) -> Result<
Proposal<
Self::FeeRule,
WalletTransparentOutput,
<<Self as InputSelector>::DataSource as WalletRead>::NoteRef,
>,
Proposal<Self::FeeRule, <<Self as InputSelector>::DataSource as WalletRead>::NoteRef>,
InputSelectorError<<<Self as InputSelector>::DataSource as WalletRead>::Error, Self::Error>,
>
where
@ -291,10 +295,7 @@ where
anchor_height: BlockHeight,
target_height: BlockHeight,
transaction_request: TransactionRequest,
) -> Result<
Proposal<Self::FeeRule, std::convert::Infallible, DbT::NoteRef>,
InputSelectorError<DbT::Error, Self::Error>,
>
) -> Result<Proposal<Self::FeeRule, DbT::NoteRef>, InputSelectorError<DbT::Error, Self::Error>>
where
ParamsT: consensus::Parameters,
{
@ -361,6 +362,8 @@ where
sapling_inputs,
balance,
fee_rule: (*self.change_strategy.fee_rule()).clone(),
target_height,
is_shielding: false,
});
}
Err(ChangeError::DustInputs { mut sapling, .. }) => {
@ -404,10 +407,7 @@ where
source_addrs: &[TransparentAddress],
confirmed_height: BlockHeight,
target_height: BlockHeight,
) -> Result<
Proposal<Self::FeeRule, WalletTransparentOutput, DbT::NoteRef>,
InputSelectorError<DbT::Error, Self::Error>,
>
) -> Result<Proposal<Self::FeeRule, DbT::NoteRef>, InputSelectorError<DbT::Error, Self::Error>>
where
ParamsT: consensus::Parameters,
{
@ -461,6 +461,8 @@ where
sapling_inputs: vec![],
balance,
fee_rule: (*self.change_strategy.fee_rule()).clone(),
target_height,
is_shielding: true,
})
} else {
Err(InputSelectorError::InsufficientFunds {

31
zcash_client_sqlite/src/wallet/transact.rs
View File

@ -194,7 +194,7 @@ mod tests {
legacy::TransparentAddress,
sapling::{note_encryption::try_sapling_output_recovery, prover::TxProver},
transaction::{components::Amount, fees::zip317::FeeRule as Zip317FeeRule, Transaction},
zip32::sapling::ExtendedSpendingKey,
zip32::{sapling::ExtendedSpendingKey, Scope},
};
use zcash_client_backend::{
@ -699,26 +699,21 @@ mod tests {
.unwrap();
let tx = Transaction::read(&raw_tx[..], BranchId::Canopy).unwrap();
// Fetch the output index from the database
let output_index: i64 = db_write
.wallet_db
.conn
.query_row(
"SELECT output_index FROM sent_notes
WHERE tx = ?",
[tx_row],
|row| row.get(0),
)
.unwrap();
let output = &tx.sapling_bundle().unwrap().shielded_outputs()[output_index as usize];
try_sapling_output_recovery(
for output in tx.sapling_bundle().unwrap().shielded_outputs() {
// Find the output that decrypts with the external OVK
let result = try_sapling_output_recovery(
&network,
sapling_activation_height(),
&dfvk.fvk().ovk,
&dfvk.to_ovk(Scope::External),
output,
)
);
if result.is_some() {
return result;
}
}
None
};
// Send some of the funds to another address, keeping history.