openzeppelin_relayer/domain/transaction/stellar/prepare/

mod.rs

//! This module contains the preparation-related functionality for Stellar transactions.
//! It includes methods for preparing transactions with robust error handling,
//! ensuring lanes are always properly cleaned up on failure.

// Declare submodules from the prepare/ directory
pub mod common;
pub mod fee_bump;
pub mod operations;
pub mod unsigned_xdr;

use eyre::Result;
use tracing::{debug, info, warn};

use super::{is_final_state, lane_gate, StellarRelayerTransaction};
use crate::models::RelayerRepoModel;
use crate::{
    jobs::JobProducerTrait,
    models::{
        TransactionError, TransactionInput, TransactionRepoModel, TransactionStatus,
        TransactionUpdateRequest,
    },
    repositories::{Repository, TransactionCounterTrait, TransactionRepository},
    services::{provider::StellarProviderTrait, signer::Signer},
};

use common::{sign_and_finalize_transaction, update_and_notify_transaction};

impl<R, T, J, S, P, C, D> StellarRelayerTransaction<R, T, J, S, P, C, D>
where
    R: Repository<RelayerRepoModel, String> + Send + Sync,
    T: TransactionRepository + Send + Sync,
    J: JobProducerTrait + Send + Sync,
    S: Signer + Send + Sync,
    P: StellarProviderTrait + Send + Sync,
    C: TransactionCounterTrait + Send + Sync,
    D: crate::services::stellar_dex::StellarDexServiceTrait + Send + Sync + 'static,
{
    /// Main preparation method with robust error handling and guaranteed lane cleanup.
    pub async fn prepare_transaction_impl(
        &self,
        tx: TransactionRepoModel,
    ) -> Result<TransactionRepoModel, TransactionError> {
        debug!(status = ?tx.status, "preparing stellar transaction");

        // Defensive check: if transaction is in a final state or unexpected state, don't retry
        if is_final_state(&tx.status) {
            warn!(
                tx_id = %tx.id,
                status = ?tx.status,
                "transaction already in final state, skipping preparation"
            );
            return Ok(tx);
        }

        if tx.status != TransactionStatus::Pending {
            debug!(
                tx_id = %tx.id,
                status = ?tx.status,
                expected_status = ?TransactionStatus::Pending,
                "transaction in unexpected state for preparation, skipping"
            );
            return Ok(tx);
        }

        if !self.concurrent_transactions_enabled() && !lane_gate::claim(&self.relayer().id, &tx.id)
        {
            info!("relayer already has a transaction in flight, must wait");
            return Ok(tx);
        }

        debug!("preparing transaction {}", tx.id);

        // Call core preparation logic with error handling
        match self.prepare_core(tx.clone()).await {
            Ok(prepared_tx) => Ok(prepared_tx),
            Err(error) => {
                // Always cleanup on failure - this is the critical safety mechanism
                self.handle_prepare_failure(tx, error).await
            }
        }
    }

    /// Core preparation logic
    async fn prepare_core(
        &self,
        tx: TransactionRepoModel,
    ) -> Result<TransactionRepoModel, TransactionError> {
        let stellar_data = tx.network_data.get_stellar_transaction_data()?;

        // Simple dispatch to appropriate processing function based on input type
        let policy = self.relayer().policies.get_stellar_policy();
        match &stellar_data.transaction_input {
            TransactionInput::Operations(_) => {
                debug!("preparing operations-based transaction {}", tx.id);
                let stellar_data_with_sim = operations::process_operations(
                    self.transaction_counter_service(),
                    &self.relayer().id,
                    &self.relayer().address,
                    &tx,
                    stellar_data,
                    self.provider(),
                    self.signer(),
                    Some(&policy),
                )
                .await?;
                self.finalize_with_signature(tx, stellar_data_with_sim)
                    .await
            }
            TransactionInput::UnsignedXdr(_) => {
                debug!("preparing unsigned xdr transaction {}", tx.id);
                let stellar_data_with_sim = unsigned_xdr::process_unsigned_xdr(
                    self.transaction_counter_service(),
                    &self.relayer().id,
                    &self.relayer().address,
                    stellar_data,
                    self.provider(),
                    self.signer(),
                    Some(&policy),
                    self.dex_service(),
                )
                .await?;
                self.finalize_with_signature(tx, stellar_data_with_sim)
                    .await
            }
            TransactionInput::SignedXdr { .. } => {
                debug!("preparing fee-bump transaction {}", tx.id);
                let stellar_data_with_fee_bump = fee_bump::process_fee_bump(
                    &self.relayer().address,
                    stellar_data,
                    self.provider(),
                    self.signer(),
                    Some(&policy),
                    self.dex_service(),
                )
                .await?;
                update_and_notify_transaction(
                    self.transaction_repository(),
                    self.job_producer(),
                    tx.id,
                    stellar_data_with_fee_bump,
                    self.relayer().notification_id.as_deref(),
                )
                .await
            }
        }
    }

    /// Helper to sign and finalize transactions for Operations and UnsignedXdr inputs.
    async fn finalize_with_signature(
        &self,
        tx: TransactionRepoModel,
        stellar_data: crate::models::StellarTransactionData,
    ) -> Result<TransactionRepoModel, TransactionError> {
        let (tx, final_stellar_data) =
            sign_and_finalize_transaction(self.signer(), tx, stellar_data).await?;
        update_and_notify_transaction(
            self.transaction_repository(),
            self.job_producer(),
            tx.id,
            final_stellar_data,
            self.relayer().notification_id.as_deref(),
        )
        .await
    }

    /// Handles preparation failures with comprehensive cleanup and error reporting.
    /// This method ensures lanes are never left claimed after any failure.
    async fn handle_prepare_failure(
        &self,
        tx: TransactionRepoModel,
        error: TransactionError,
    ) -> Result<TransactionRepoModel, TransactionError> {
        let error_reason = format!("Preparation failed: {error}");
        let tx_id = tx.id.clone(); // Clone the ID before moving tx
        warn!(reason = %error_reason, "transaction preparation failed");

        // Step 1: Sync sequence from chain to recover from any potential sequence drift
        if let Ok(stellar_data) = tx.network_data.get_stellar_transaction_data() {
            info!("syncing sequence from chain after failed transaction preparation");
            // Always sync from chain on preparation failure to ensure correct sequence state
            match self
                .sync_sequence_from_chain(&stellar_data.source_account)
                .await
            {
                Ok(()) => {
                    info!("successfully synced sequence from chain");
                }
                Err(sync_error) => {
                    warn!(error = %sync_error, "failed to sync sequence from chain");
                }
            }
        }

        // Step 2: Mark transaction as Failed with detailed reason
        let update_request = TransactionUpdateRequest {
            status: Some(TransactionStatus::Failed),
            status_reason: Some(error_reason.clone()),
            ..Default::default()
        };
        let _failed_tx = match self
            .finalize_transaction_state(tx_id.clone(), update_request)
            .await
        {
            Ok(updated_tx) => updated_tx,
            Err(finalize_error) => {
                warn!(error = %finalize_error, "failed to mark transaction as failed, proceeding with lane cleanup");
                // Continue with cleanup even if we can't update the transaction
                tx
            }
        };

        // Step 3: Handle lane cleanup (only needed in sequential mode)
        if !self.concurrent_transactions_enabled() {
            // In sequential mode, attempt to hand off to next transaction or release lane
            if let Err(enqueue_error) = self.enqueue_next_pending_transaction(&tx_id).await {
                warn!(error = %enqueue_error, "failed to enqueue next pending transaction after failure, releasing lane directly");
                // Fallback: release lane directly if we can't hand it over
                lane_gate::free(&self.relayer().id, &tx_id);
            }
        }

        // Step 4: Log failure for monitoring (prepare_fail_total metric would go here)
        info!(error = %error_reason, "transaction preparation failure handled, lane cleaned up");

        // Step 5: Return original error to maintain API compatibility
        Err(error)
    }
}

#[cfg(test)]
mod prepare_transaction_tests {
    use std::future::ready;

    use super::*;
    use crate::{
        domain::SignTransactionResponse,
        models::{NetworkTransactionData, OperationSpec, RepositoryError, TransactionStatus},
        services::provider::ProviderError,
    };
    use soroban_rs::xdr::{Limits, ReadXdr, TransactionEnvelope};

    use crate::domain::transaction::stellar::test_helpers::*;

    #[tokio::test]
    async fn prepare_transaction_happy_path() {
        let relayer = create_test_relayer();
        let mut mocks = default_test_mocks();

        // sequence counter
        mocks
            .counter
            .expect_get_and_increment()
            .returning(|_, _| Box::pin(ready(Ok(1))));

        // signer
        mocks.signer.expect_sign_transaction().returning(|_| {
            Box::pin(async {
                Ok(SignTransactionResponse::Stellar(
                    crate::domain::SignTransactionResponseStellar {
                        signature: dummy_signature(),
                    },
                ))
            })
        });

        mocks
            .tx_repo
            .expect_partial_update()
            .withf(|_, upd| {
                upd.status == Some(TransactionStatus::Sent) && upd.network_data.is_some()
            })
            .returning(|id, upd| {
                let mut tx = create_test_transaction("relayer-1");
                tx.id = id;
                tx.status = upd.status.unwrap();
                tx.network_data = upd.network_data.unwrap();
                Ok::<_, RepositoryError>(tx)
            });

        // submit-job + notification
        mocks
            .job_producer
            .expect_produce_submit_transaction_job()
            .times(1)
            .returning(|_, _| Box::pin(async { Ok(()) }));

        mocks
            .job_producer
            .expect_produce_send_notification_job()
            .times(1)
            .returning(|_, _| Box::pin(async { Ok(()) }));

        let handler = make_stellar_tx_handler(relayer.clone(), mocks);
        let tx = create_test_transaction(&relayer.id);

        assert!(handler.prepare_transaction_impl(tx).await.is_ok());
    }

    #[tokio::test]
    async fn prepare_transaction_stores_signed_envelope_xdr() {
        let relayer = create_test_relayer();
        let mut mocks = default_test_mocks();

        // sequence counter
        mocks
            .counter
            .expect_get_and_increment()
            .returning(|_, _| Box::pin(ready(Ok(1))));

        // signer
        mocks.signer.expect_sign_transaction().returning(|_| {
            Box::pin(async {
                Ok(SignTransactionResponse::Stellar(
                    crate::domain::SignTransactionResponseStellar {
                        signature: dummy_signature(),
                    },
                ))
            })
        });

        mocks
            .tx_repo
            .expect_partial_update()
            .withf(|_, upd| {
                upd.status == Some(TransactionStatus::Sent) && upd.network_data.is_some()
            })
            .returning(move |id, upd| {
                let mut tx = create_test_transaction("relayer-1");
                tx.id = id;
                tx.status = upd.status.unwrap();
                tx.network_data = upd.network_data.clone().unwrap();
                Ok::<_, RepositoryError>(tx)
            });

        // submit-job + notification
        mocks
            .job_producer
            .expect_produce_submit_transaction_job()
            .times(1)
            .returning(|_, _| Box::pin(async { Ok(()) }));

        mocks
            .job_producer
            .expect_produce_send_notification_job()
            .times(1)
            .returning(|_, _| Box::pin(async { Ok(()) }));

        let handler = make_stellar_tx_handler(relayer.clone(), mocks);
        let tx = create_test_transaction(&relayer.id);

        let result = handler.prepare_transaction_impl(tx).await;
        assert!(result.is_ok());

        // Verify the signed_envelope_xdr was populated
        if let Ok(prepared_tx) = result {
            if let NetworkTransactionData::Stellar(stellar_data) = &prepared_tx.network_data {
                assert!(
                    stellar_data.signed_envelope_xdr.is_some(),
                    "signed_envelope_xdr should be populated"
                );

                // Verify it's valid XDR by attempting to parse it
                let xdr = stellar_data.signed_envelope_xdr.as_ref().unwrap();
                let envelope_result = TransactionEnvelope::from_xdr_base64(xdr, Limits::none());
                assert!(
                    envelope_result.is_ok(),
                    "signed_envelope_xdr should be valid XDR"
                );

                // Verify the envelope has signatures
                if let Ok(envelope) = envelope_result {
                    match envelope {
                        TransactionEnvelope::Tx(ref e) => {
                            assert!(!e.signatures.is_empty(), "Envelope should have signatures");
                        }
                        _ => panic!("Expected Tx envelope type"),
                    }
                }
            } else {
                panic!("Expected Stellar transaction data");
            }
        }
    }

    #[tokio::test]
    async fn prepare_transaction_sequence_failure_cleans_up_lane() {
        let relayer = create_test_relayer();
        let mut mocks = default_test_mocks();

        // Mock sequence counter to fail
        mocks.counter.expect_get_and_increment().returning(|_, _| {
            Box::pin(async {
                Err(RepositoryError::NotFound(
                    "Counter service failure".to_string(),
                ))
            })
        });

        // Mock sync_sequence_from_chain for error handling
        mocks.provider.expect_get_account().returning(|_| {
            Box::pin(async {
                use soroban_rs::xdr::{
                    AccountEntry, AccountEntryExt, AccountId, PublicKey, SequenceNumber, String32,
                    Thresholds, Uint256,
                };
                use stellar_strkey::ed25519;

                let pk = ed25519::PublicKey::from_string(TEST_PK).unwrap();
                let account_id = AccountId(PublicKey::PublicKeyTypeEd25519(Uint256(pk.0)));

                Ok(AccountEntry {
                    account_id,
                    balance: 1000000,
                    seq_num: SequenceNumber(0),
                    num_sub_entries: 0,
                    inflation_dest: None,
                    flags: 0,
                    home_domain: String32::default(),
                    thresholds: Thresholds([1, 1, 1, 1]),
                    signers: Default::default(),
                    ext: AccountEntryExt::V0,
                })
            })
        });

        mocks
            .counter
            .expect_set()
            .returning(|_, _, _| Box::pin(ready(Ok(()))));

        // Mock finalize_transaction_state for failure handling
        mocks
            .tx_repo
            .expect_partial_update()
            .withf(|_, upd| upd.status == Some(TransactionStatus::Failed))
            .returning(|id, upd| {
                let mut tx = create_test_transaction("relayer-1");
                tx.id = id;
                tx.status = upd.status.unwrap();
                Ok::<_, RepositoryError>(tx)
            });

        // Mock notification for failed transaction
        mocks
            .job_producer
            .expect_produce_send_notification_job()
            .times(1)
            .returning(|_, _| Box::pin(async { Ok(()) }));

        // Mock find_by_status for enqueue_next_pending_transaction
        mocks
            .tx_repo
            .expect_find_by_status()
            .returning(|_, _| Ok(vec![])); // No pending transactions

        let handler = make_stellar_tx_handler(relayer.clone(), mocks);
        let mut tx = create_test_transaction(&relayer.id);

        // Remove the sequence number since it wouldn't be set if get_and_increment fails
        if let NetworkTransactionData::Stellar(ref mut data) = tx.network_data {
            data.sequence_number = None;
        }

        // Verify that lane is claimed initially
        assert!(lane_gate::claim(&relayer.id, &tx.id));

        let result = handler.prepare_transaction_impl(tx.clone()).await;

        // Should return error but lane should be cleaned up
        assert!(result.is_err());

        // Verify lane is released - another transaction should be able to claim it
        let another_tx_id = "another-tx";
        assert!(lane_gate::claim(&relayer.id, another_tx_id));
        lane_gate::free(&relayer.id, another_tx_id)
    }

    #[tokio::test]
    async fn prepare_transaction_signer_failure_cleans_up_lane() {
        let relayer = create_test_relayer();
        let mut mocks = default_test_mocks();

        // sequence counter succeeds
        mocks
            .counter
            .expect_get_and_increment()
            .returning(|_, _| Box::pin(ready(Ok(1))));

        // Expect sync_sequence_from_chain to be called in handle_prepare_failure
        mocks.provider.expect_get_account().returning(|_| {
            Box::pin(async {
                use soroban_rs::xdr::{
                    AccountEntry, AccountEntryExt, AccountId, PublicKey, SequenceNumber, String32,
                    Thresholds, Uint256,
                };
                use stellar_strkey::ed25519;

                let pk = ed25519::PublicKey::from_string(TEST_PK).unwrap();
                let account_id = AccountId(PublicKey::PublicKeyTypeEd25519(Uint256(pk.0)));

                Ok(AccountEntry {
                    account_id,
                    balance: 1000000,
                    seq_num: SequenceNumber(0),
                    num_sub_entries: 0,
                    inflation_dest: None,
                    flags: 0,
                    home_domain: String32::default(),
                    thresholds: Thresholds([1, 1, 1, 1]),
                    signers: Default::default(),
                    ext: AccountEntryExt::V0,
                })
            })
        });

        mocks
            .counter
            .expect_set()
            .returning(|_, _, _| Box::pin(ready(Ok(()))));

        // signer fails
        mocks.signer.expect_sign_transaction().returning(|_| {
            Box::pin(async {
                Err(crate::models::SignerError::SigningError(
                    "Signer failure".to_string(),
                ))
            })
        });

        // Mock finalize_transaction_state for failure handling
        mocks
            .tx_repo
            .expect_partial_update()
            .withf(|_, upd| upd.status == Some(TransactionStatus::Failed))
            .returning(|id, upd| {
                let mut tx = create_test_transaction("relayer-1");
                tx.id = id;
                tx.status = upd.status.unwrap();
                Ok::<_, RepositoryError>(tx)
            });

        // Mock notification for failed transaction
        mocks
            .job_producer
            .expect_produce_send_notification_job()
            .times(1)
            .returning(|_, _| Box::pin(async { Ok(()) }));

        // Mock find_by_status for enqueue_next_pending_transaction
        mocks
            .tx_repo
            .expect_find_by_status()
            .returning(|_, _| Ok(vec![])); // No pending transactions

        let handler = make_stellar_tx_handler(relayer.clone(), mocks);
        let tx = create_test_transaction(&relayer.id);

        let result = handler.prepare_transaction_impl(tx.clone()).await;

        // Should return error but lane should be cleaned up
        assert!(result.is_err());

        // Verify lane is released
        let another_tx_id = "another-tx";
        assert!(lane_gate::claim(&relayer.id, another_tx_id));
        lane_gate::free(&relayer.id, another_tx_id); // cleanup
    }

    #[tokio::test]
    async fn prepare_transaction_already_claimed_lane_returns_original() {
        let mut relayer = create_test_relayer();
        relayer.id = "unique-relayer-for-lane-test".to_string(); // Use unique relayer ID
        let mocks = default_test_mocks();

        let handler = make_stellar_tx_handler(relayer.clone(), mocks);
        let tx = create_test_transaction(&relayer.id);

        // Claim lane with different transaction
        assert!(lane_gate::claim(&relayer.id, "other-tx"));

        let result = handler.prepare_transaction_impl(tx.clone()).await;

        // Should return Ok with original transaction (waiting)
        assert!(result.is_ok());
        let returned_tx = result.unwrap();
        assert_eq!(returned_tx.id, tx.id);
        assert_eq!(returned_tx.status, tx.status);

        // Cleanup
        lane_gate::free(&relayer.id, "other-tx");
    }

    #[tokio::test]
    async fn test_prepare_failure_syncs_sequence() {
        let relayer = create_test_relayer();
        let mut mocks = default_test_mocks();

        // Track sequence operations
        let sequence_value = 42u64;

        // Mock get_and_increment to return 42
        mocks
            .counter
            .expect_get_and_increment()
            .times(1)
            .returning(move |_, _| Box::pin(ready(Ok(sequence_value))));

        // Mock sync_sequence_from_chain to verify it's called on failure
        mocks.provider.expect_get_account().times(1).returning(|_| {
            Box::pin(async {
                use soroban_rs::xdr::{
                    AccountEntry, AccountEntryExt, AccountId, PublicKey, SequenceNumber, String32,
                    Thresholds, Uint256,
                };
                use stellar_strkey::ed25519;

                let pk = ed25519::PublicKey::from_string(TEST_PK).unwrap();
                let account_id = AccountId(PublicKey::PublicKeyTypeEd25519(Uint256(pk.0)));

                Ok(AccountEntry {
                    account_id,
                    balance: 1000000,
                    seq_num: SequenceNumber(41), // On-chain sequence is 41
                    num_sub_entries: 0,
                    inflation_dest: None,
                    flags: 0,
                    home_domain: String32::default(),
                    thresholds: Thresholds([1, 1, 1, 1]),
                    signers: Default::default(),
                    ext: AccountEntryExt::V0,
                })
            })
        });

        mocks
            .counter
            .expect_set()
            .times(1)
            .withf(|_, _, seq| *seq == 42) // Next usable = 41 + 1
            .returning(|_, _, _| Box::pin(ready(Ok(()))));

        // Mock signer to fail after sequence is incremented
        mocks
            .signer
            .expect_sign_transaction()
            .times(1)
            .returning(|_| {
                Box::pin(async {
                    Err(crate::models::SignerError::SigningError(
                        "Simulated signing failure".to_string(),
                    ))
                })
            });

        // Mock transaction update for failure
        mocks
            .tx_repo
            .expect_partial_update()
            .withf(|_, upd| upd.status == Some(TransactionStatus::Failed))
            .returning(|id, upd| {
                let mut tx = create_test_transaction("relayer-1");
                tx.id = id;
                tx.status = upd.status.unwrap();
                Ok::<_, RepositoryError>(tx)
            });

        // Mock notification
        mocks
            .job_producer
            .expect_produce_send_notification_job()
            .times(1)
            .returning(|_, _| Box::pin(async { Ok(()) }));

        // Mock find_by_status for enqueue_next_pending_transaction
        mocks
            .tx_repo
            .expect_find_by_status()
            .returning(|_, _| Ok(vec![]));

        let handler = make_stellar_tx_handler(relayer.clone(), mocks);
        let tx = create_test_transaction(&relayer.id);

        let result = handler.prepare_transaction_impl(tx).await;

        // Should fail with signing error
        assert!(result.is_err());
        match result.unwrap_err() {
            TransactionError::SignerError(msg) => {
                assert!(msg.contains("Simulated signing failure"));
            }
            _ => panic!("Expected SignerError"),
        }
    }

    #[tokio::test]
    async fn test_prepare_simulation_failure_syncs_sequence() {
        let relayer = create_test_relayer();
        let mut mocks = default_test_mocks();

        // Mock sequence increment
        mocks
            .counter
            .expect_get_and_increment()
            .times(1)
            .returning(|_, _| Box::pin(ready(Ok(100))));

        // Mock sync on failure
        mocks.provider.expect_get_account().times(1).returning(|_| {
            Box::pin(async {
                use soroban_rs::xdr::{
                    AccountEntry, AccountEntryExt, AccountId, PublicKey, SequenceNumber, String32,
                    Thresholds, Uint256,
                };
                use stellar_strkey::ed25519;

                let pk = ed25519::PublicKey::from_string(TEST_PK).unwrap();
                let account_id = AccountId(PublicKey::PublicKeyTypeEd25519(Uint256(pk.0)));

                Ok(AccountEntry {
                    account_id,
                    balance: 1000000,
                    seq_num: SequenceNumber(99),
                    num_sub_entries: 0,
                    inflation_dest: None,
                    flags: 0,
                    home_domain: String32::default(),
                    thresholds: Thresholds([1, 1, 1, 1]),
                    signers: Default::default(),
                    ext: AccountEntryExt::V0,
                })
            })
        });

        mocks
            .counter
            .expect_set()
            .times(1)
            .returning(|_, _, _| Box::pin(ready(Ok(()))));

        // Mock provider to fail simulation for Soroban operations
        mocks
            .provider
            .expect_simulate_transaction_envelope()
            .times(1)
            .returning(|_| {
                Box::pin(async {
                    Err(ProviderError::Other(
                        "Simulation failed: insufficient resources".to_string(),
                    ))
                })
            });

        // Mock transaction update for failure
        mocks
            .tx_repo
            .expect_partial_update()
            .withf(|_, upd| upd.status == Some(TransactionStatus::Failed))
            .returning(|id, upd| {
                let mut tx = create_test_transaction("relayer-1");
                tx.id = id;
                tx.status = upd.status.unwrap();
                Ok::<_, RepositoryError>(tx)
            });

        // Mock notification and enqueue
        mocks
            .job_producer
            .expect_produce_send_notification_job()
            .times(1)
            .returning(|_, _| Box::pin(async { Ok(()) }));

        mocks
            .tx_repo
            .expect_find_by_status()
            .returning(|_, _| Ok(vec![]));

        let handler = make_stellar_tx_handler(relayer.clone(), mocks);

        // Create transaction with Soroban operation to trigger simulation
        let mut tx = create_test_transaction(&relayer.id);
        if let NetworkTransactionData::Stellar(ref mut data) = tx.network_data {
            data.transaction_input =
                crate::models::TransactionInput::Operations(vec![OperationSpec::InvokeContract {
                    contract_address: "CA7QYNF7SOWQ3GLR2BGMZEHXAVIRZA4KVWLTJJFC7MGXUA74P7UJUWDA"
                        .to_string(),
                    function_name: "test".to_string(),
                    args: vec![],
                    auth: None,
                }]);
        }

        let result = handler.prepare_transaction_impl(tx).await;

        // Should fail with provider error
        assert!(result.is_err());
    }

    #[tokio::test]
    async fn test_prepare_xdr_parsing_failure_syncs_sequence() {
        let relayer = create_test_relayer();
        let mut mocks = default_test_mocks();

        // For unsigned XDR, validation happens before sequence increment
        // Source account mismatch is detected before get_and_increment is called
        // But we still sync sequence on any prepare failure

        // Mock sync_sequence_from_chain
        mocks.provider.expect_get_account().times(1).returning(|_| {
            Box::pin(async {
                use soroban_rs::xdr::{
                    AccountEntry, AccountEntryExt, AccountId, PublicKey, SequenceNumber, String32,
                    Thresholds, Uint256,
                };
                use stellar_strkey::ed25519;

                let pk = ed25519::PublicKey::from_string(TEST_PK).unwrap();
                let account_id = AccountId(PublicKey::PublicKeyTypeEd25519(Uint256(pk.0)));

                Ok(AccountEntry {
                    account_id,
                    balance: 1000000,
                    seq_num: SequenceNumber(50),
                    num_sub_entries: 0,
                    inflation_dest: None,
                    flags: 0,
                    home_domain: String32::default(),
                    thresholds: Thresholds([1, 1, 1, 1]),
                    signers: Default::default(),
                    ext: AccountEntryExt::V0,
                })
            })
        });

        mocks
            .counter
            .expect_set()
            .times(1)
            .returning(|_, _, _| Box::pin(ready(Ok(()))));

        // Mock transaction update for failure
        mocks
            .tx_repo
            .expect_partial_update()
            .withf(|_, upd| upd.status == Some(TransactionStatus::Failed))
            .returning(|id, upd| {
                let mut tx = create_test_transaction("relayer-1");
                tx.id = id;
                tx.status = upd.status.unwrap();
                Ok::<_, RepositoryError>(tx)
            });

        // Mock notification and enqueue
        mocks
            .job_producer
            .expect_produce_send_notification_job()
            .times(1)
            .returning(|_, _| Box::pin(async { Ok(()) }));

        mocks
            .tx_repo
            .expect_find_by_status()
            .returning(|_, _| Ok(vec![]));

        let handler = make_stellar_tx_handler(relayer.clone(), mocks);

        // Create transaction with invalid unsigned XDR
        let mut tx = create_test_transaction(&relayer.id);
        if let NetworkTransactionData::Stellar(ref mut data) = tx.network_data {
            // Remove sequence since it will never be set due to early validation failure
            data.sequence_number = None;
            // Use a different source account to trigger validation error
            data.transaction_input = crate::models::TransactionInput::UnsignedXdr(
                // This will fail validation due to source account mismatch
                "AAAAAgAAAAA5MbUzuTfU6p3NeJp5w3TpKhZmx6p1pR7mq9wFwCnEIgAAAGQAAAAAAAAAAQAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAQAAAADk4GIHV/3i2tOMBkqKqN3Y9x3FvNm8z4B5PEzPn7hEaAAAAAAAAAAAAAAAZAAAAAAAAAAA".to_string()
            );
        }

        let result = handler.prepare_transaction_impl(tx).await;

        // Should fail with validation error
        assert!(result.is_err());
        match result.unwrap_err() {
            TransactionError::ValidationError(msg) => {
                assert!(msg.contains("does not match relayer account"));
            }
            _ => panic!("Expected ValidationError"),
        }
    }
}

#[cfg(test)]
mod refactoring_tests {
    use crate::domain::transaction::stellar::prepare::common::update_and_notify_transaction;
    use crate::domain::transaction::stellar::test_helpers::*;
    use crate::domain::{stellar::lane_gate, SignTransactionResponse};
    use crate::models::{
        NetworkTransactionData, RepositoryError, StellarTransactionData, TransactionInput,
        TransactionStatus,
    };
    use std::future::ready;

    #[tokio::test]
    async fn test_prepare_with_concurrent_mode_no_lane_claiming() {
        // With concurrent transactions enabled, prepare should NOT claim lanes
        let mut relayer = create_test_relayer();
        if let crate::models::RelayerNetworkPolicy::Stellar(ref mut policy) = relayer.policies {
            policy.concurrent_transactions = Some(true);
        }
        let mut mocks = default_test_mocks();

        // Setup mocks for successful prepare
        mocks
            .counter
            .expect_get_and_increment()
            .returning(|_, _| Box::pin(ready(Ok(1))));

        mocks.signer.expect_sign_transaction().returning(|_| {
            Box::pin(async {
                Ok(SignTransactionResponse::Stellar(
                    crate::domain::SignTransactionResponseStellar {
                        signature: dummy_signature(),
                    },
                ))
            })
        });

        mocks.tx_repo.expect_partial_update().returning(|id, upd| {
            let mut tx = create_test_transaction("relayer-1");
            tx.id = id;
            tx.status = upd.status.unwrap();
            tx.network_data = upd.network_data.unwrap();
            Ok::<_, RepositoryError>(tx)
        });

        mocks
            .job_producer
            .expect_produce_submit_transaction_job()
            .returning(|_, _| Box::pin(async { Ok(()) }));

        mocks
            .job_producer
            .expect_produce_send_notification_job()
            .returning(|_, _| Box::pin(async { Ok(()) }));

        let handler = make_stellar_tx_handler(relayer.clone(), mocks);
        let tx = create_test_transaction(&relayer.id);

        // In concurrent mode, another transaction should be able to claim the lane
        // even while this one is being processed
        let other_tx_id = "concurrent-tx";
        assert!(lane_gate::claim(&relayer.id, other_tx_id));

        // Prepare should succeed without claiming the lane
        let result = handler.prepare_transaction_impl(tx).await;
        assert!(result.is_ok());

        // Cleanup
        lane_gate::free(&relayer.id, other_tx_id);
    }

    #[tokio::test]
    async fn test_prepare_failure_with_concurrent_mode_no_lane_cleanup() {
        // With concurrent transactions enabled, prepare failure should NOT manage lanes
        let mut relayer = create_test_relayer();
        if let crate::models::RelayerNetworkPolicy::Stellar(ref mut policy) = relayer.policies {
            policy.concurrent_transactions = Some(true);
        }
        let mut mocks = default_test_mocks();

        // Mock sequence counter to fail
        mocks.counter.expect_get_and_increment().returning(|_, _| {
            Box::pin(ready(Err(RepositoryError::Unknown(
                "Counter error".to_string(),
            ))))
        });

        // Mock sync_sequence_from_chain for error recovery
        mocks.provider.expect_get_account().returning(|_| {
            Box::pin(async {
                use soroban_rs::xdr::{
                    AccountEntry, AccountEntryExt, AccountId, PublicKey, SequenceNumber, String32,
                    Thresholds, Uint256,
                };
                use stellar_strkey::ed25519;

                let pk = ed25519::PublicKey::from_string(TEST_PK).unwrap();
                let account_id = AccountId(PublicKey::PublicKeyTypeEd25519(Uint256(pk.0)));

                Ok(AccountEntry {
                    account_id,
                    balance: 1000000,
                    seq_num: SequenceNumber(0),
                    num_sub_entries: 0,
                    inflation_dest: None,
                    flags: 0,
                    home_domain: String32::default(),
                    thresholds: Thresholds([1, 1, 1, 1]),
                    signers: Default::default(),
                    ext: AccountEntryExt::V0,
                })
            })
        });

        mocks
            .counter
            .expect_set()
            .returning(|_, _, _| Box::pin(ready(Ok(()))));

        // Mock finalize_transaction_state for failure
        mocks.tx_repo.expect_partial_update().returning(|id, upd| {
            let mut tx = create_test_transaction("relayer-1");
            tx.id = id;
            tx.status = upd.status.unwrap();
            Ok::<_, RepositoryError>(tx)
        });

        mocks
            .job_producer
            .expect_produce_send_notification_job()
            .returning(|_, _| Box::pin(async { Ok(()) }));

        // In concurrent mode, should NOT look for pending transactions
        mocks.tx_repo.expect_find_by_status().times(0); // Should not be called

        let handler = make_stellar_tx_handler(relayer.clone(), mocks);
        let tx = create_test_transaction(&relayer.id);

        let result = handler.prepare_transaction_impl(tx).await;
        assert!(result.is_err());
    }

    #[tokio::test]
    async fn test_update_and_notify_transaction_consistency() {
        let relayer = create_test_relayer();
        let mut mocks = default_test_mocks();

        // Mock the repository update
        let expected_stellar_data = StellarTransactionData {
            source_account: TEST_PK.to_string(),
            network_passphrase: "Test SDF Network ; September 2015".to_string(),
            fee: Some(100),
            sequence_number: Some(1),
            transaction_input: TransactionInput::Operations(vec![]),
            memo: None,
            valid_until: None,
            signatures: vec![],
            hash: None,
            simulation_transaction_data: None,
            signed_envelope_xdr: Some("test-xdr".to_string()),
        };

        let expected_xdr = expected_stellar_data.signed_envelope_xdr.clone();
        mocks
            .tx_repo
            .expect_partial_update()
            .withf(move |id, upd| {
                id == "tx-1"
                    && upd.status == Some(TransactionStatus::Sent)
                    && if let Some(NetworkTransactionData::Stellar(ref data)) = upd.network_data {
                        data.signed_envelope_xdr == expected_xdr
                    } else {
                        false
                    }
            })
            .returning(|id, upd| {
                let mut tx = create_test_transaction("relayer-1");
                tx.id = id;
                tx.status = upd.status.unwrap();
                tx.network_data = upd.network_data.unwrap();
                Ok::<_, RepositoryError>(tx)
            });

        // Mock job production
        mocks
            .job_producer
            .expect_produce_submit_transaction_job()
            .times(1)
            .returning(|_, _| Box::pin(async { Ok(()) }));

        mocks
            .job_producer
            .expect_produce_send_notification_job()
            .times(1)
            .returning(|_, _| Box::pin(async { Ok(()) }));

        let handler = make_stellar_tx_handler(relayer.clone(), mocks);

        // Test update_and_notify_transaction directly
        let result = update_and_notify_transaction(
            handler.transaction_repository(),
            handler.job_producer(),
            "tx-1".to_string(),
            expected_stellar_data,
            handler.relayer().notification_id.as_deref(),
        )
        .await;

        assert!(result.is_ok());
        let updated_tx = result.unwrap();
        assert_eq!(updated_tx.status, TransactionStatus::Sent);

        if let NetworkTransactionData::Stellar(data) = &updated_tx.network_data {
            assert_eq!(data.signed_envelope_xdr, Some("test-xdr".to_string()));
        } else {
            panic!("Expected Stellar transaction data");
        }
    }
}