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// Copyright 2021 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0
use crate::{
client::secret::SecretManage,
types::{
api::core::response::LedgerInclusionState,
block::{input::Input, output::OutputId, payload::transaction::TransactionEssence, BlockId},
},
utils::unix_timestamp_now,
wallet::account::{
types::{InclusionState, Transaction},
Account, AccountDetails,
},
};
// ignore outputs and transactions from other networks
// check if outputs are unspent, rebroadcast, reattach...
// also revalidate that the locked outputs needs to be there, maybe there was a conflict or the transaction got
// confirmed, then they should get removed
impl<S: 'static + SecretManage> Account<S>
where
crate::wallet::Error: From<S::Error>,
{
/// Sync transactions and reattach them if unconfirmed. Returns the transaction with updated metadata and spent
/// output ids that don't need to be locked anymore
/// Return true if a transaction got confirmed for which we don't have an output already, based on this outputs will
/// be synced again
pub(crate) async fn sync_pending_transactions(&self) -> crate::wallet::Result<bool> {
log::debug!("[SYNC] sync pending transactions");
let account_details = self.details().await;
// only set to true if a transaction got confirmed for which we don't have an output
// (transaction_output.is_none())
let mut confirmed_unknown_output = false;
if account_details.pending_transactions.is_empty() {
return Ok(confirmed_unknown_output);
}
let network_id = self.client().get_network_id().await?;
let mut updated_transactions = Vec::new();
let mut spent_output_ids = Vec::new();
// Inputs from conflicting transactions that are unspent, but should be removed from the locked outputs so they
// are available again
let mut output_ids_to_unlock = Vec::new();
let mut transactions_to_reattach = Vec::new();
for transaction_id in &account_details.pending_transactions {
log::debug!("[SYNC] sync pending transaction {transaction_id}");
let transaction = account_details
.transactions
.get(transaction_id)
// panic during development to easier detect if something is wrong, should be handled different later
.expect("transaction id stored, but transaction is missing")
.clone();
// only check transaction from the network we're connected to
if transaction.network_id != network_id {
continue;
}
// check if we have an output (remainder, if not sending to an own address) that got created by this
// transaction, if that's the case, then the transaction got confirmed
let transaction_output = account_details
.outputs
.keys()
.find(|o| o.transaction_id() == transaction_id);
if let Some(transaction_output) = transaction_output {
// Save to unwrap, we just got the output
let confirmed_output_data = account_details.outputs.get(transaction_output).expect("output exists");
log::debug!(
"[SYNC] confirmed transaction {transaction_id} in block {}",
confirmed_output_data.metadata.block_id()
);
updated_transaction_and_outputs(
transaction,
Some(*confirmed_output_data.metadata.block_id()),
InclusionState::Confirmed,
&mut updated_transactions,
&mut spent_output_ids,
);
continue;
}
// Check if the inputs of the transaction are still unspent
let TransactionEssence::Regular(essence) = transaction.payload.essence();
let mut input_got_spent = false;
for input in essence.inputs() {
if let Input::Utxo(input) = input {
if let Some(input) = account_details.outputs.get(input.output_id()) {
if input.is_spent {
input_got_spent = true;
}
}
}
}
if let Some(block_id) = transaction.block_id {
match self.client().get_block_metadata(&block_id).await {
Ok(metadata) => {
if let Some(inclusion_state) = metadata.ledger_inclusion_state {
match inclusion_state {
LedgerInclusionState::Included => {
log::debug!(
"[SYNC] confirmed transaction {transaction_id} in block {}",
metadata.block_id
);
confirmed_unknown_output = true;
updated_transaction_and_outputs(
transaction,
Some(metadata.block_id),
InclusionState::Confirmed,
&mut updated_transactions,
&mut spent_output_ids,
);
}
LedgerInclusionState::Conflicting => {
// try to get the included block, because maybe only this attachment is
// conflicting because it got confirmed in another block
if let Ok(included_block) =
self.client().get_included_block(&transaction.payload.id()).await
{
confirmed_unknown_output = true;
updated_transaction_and_outputs(
transaction,
Some(included_block.id()),
// block metadata was Conflicting, but it's confirmed in another attachment
InclusionState::Confirmed,
&mut updated_transactions,
&mut spent_output_ids,
);
} else {
log::debug!("[SYNC] conflicting transaction {transaction_id}");
updated_transaction_and_outputs(
transaction,
None,
InclusionState::Conflicting,
&mut updated_transactions,
&mut spent_output_ids,
);
}
}
LedgerInclusionState::NoTransaction => {
unreachable!(
"We should only get the metadata for blocks with a transaction payload"
)
}
}
} else {
// no need to reattach if one input got spent
if input_got_spent {
process_transaction_with_unknown_state(
&account_details,
transaction,
&mut updated_transactions,
&mut output_ids_to_unlock,
)?;
} else {
let time_now = unix_timestamp_now().as_millis();
// Reattach if older than 30 seconds
if transaction.timestamp + 30000 < time_now {
// only reattach if inputs are still unspent
transactions_to_reattach.push(transaction);
}
}
}
}
Err(crate::client::Error::Node(crate::client::node_api::error::Error::NotFound(_))) => {
// no need to reattach if one input got spent
if input_got_spent {
process_transaction_with_unknown_state(
&account_details,
transaction,
&mut updated_transactions,
&mut output_ids_to_unlock,
)?;
} else {
let time_now = unix_timestamp_now().as_millis();
// Reattach if older than 30 seconds
if transaction.timestamp + 30000 < time_now {
// only reattach if inputs are still unspent
transactions_to_reattach.push(transaction);
}
}
}
Err(e) => return Err(e.into()),
}
} else {
// transaction wasn't submitted yet, so we have to send it again
// no need to reattach if one input got spent
if input_got_spent {
} else {
// only reattach if inputs are still unspent
transactions_to_reattach.push(transaction);
}
}
}
drop(account_details);
for mut transaction in transactions_to_reattach {
log::debug!("[SYNC] reattach transaction");
let reattached_block = self.submit_transaction_payload(transaction.payload.clone()).await?;
transaction.block_id.replace(reattached_block);
updated_transactions.push(transaction);
}
// updates account with balances, output ids, outputs
self.update_account_with_transactions(updated_transactions, spent_output_ids, output_ids_to_unlock)
.await?;
Ok(confirmed_unknown_output)
}
}
// Set the outputs as spent so they will not be used as input again
fn updated_transaction_and_outputs(
mut transaction: Transaction,
block_id: Option<BlockId>,
inclusion_state: InclusionState,
updated_transactions: &mut Vec<Transaction>,
spent_output_ids: &mut Vec<OutputId>,
) {
transaction.block_id = block_id;
transaction.inclusion_state = inclusion_state;
// get spent inputs
let TransactionEssence::Regular(essence) = transaction.payload.essence();
for input in essence.inputs() {
if let Input::Utxo(input) = input {
spent_output_ids.push(*input.output_id());
}
}
updated_transactions.push(transaction);
}
// When a transaction got pruned, the inputs and outputs are also not available, then this could mean that it was
// confirmed and the created outputs got also already spent and pruned or the inputs got spent in another transaction
fn process_transaction_with_unknown_state(
account: &AccountDetails,
mut transaction: Transaction,
updated_transactions: &mut Vec<Transaction>,
output_ids_to_unlock: &mut Vec<OutputId>,
) -> crate::wallet::Result<()> {
let mut all_inputs_spent = true;
let TransactionEssence::Regular(essence) = transaction.payload.essence();
for input in essence.inputs() {
if let Input::Utxo(input) = input {
if let Some(output_data) = account.outputs.get(input.output_id()) {
if !output_data.metadata.is_spent() {
// unspent output needs to be made available again
output_ids_to_unlock.push(*input.output_id());
all_inputs_spent = false;
}
} else {
all_inputs_spent = false;
}
}
}
// If only a part of the inputs got spent, then it couldn't happen with this transaction, so it's conflicting
if all_inputs_spent {
transaction.inclusion_state = InclusionState::UnknownPruned;
} else {
log::debug!("[SYNC] conflicting transaction {}", transaction.transaction_id);
transaction.inclusion_state = InclusionState::Conflicting;
}
updated_transactions.push(transaction);
Ok(())
}