feat: add last_derivation_index to sync service

lib/core/src/persist/cache.rs

@@ -2,13 +2,14 @@ use anyhow::Result;
 use rusqlite::{Transaction, TransactionBehavior};
 use std::str::FromStr;
 
+use crate::sync::model::{data::LAST_DERIVATION_INDEX_DATA_ID, RecordType};
+
 use super::Persister;
 
 const KEY_SWAPPER_PROXY_URL: &str = "swapper_proxy_url";
 const KEY_IS_FIRST_SYNC_COMPLETE: &str = "is_first_sync_complete";
 const KEY_WEBHOOK_URL: &str = "webhook_url";
-// TODO: The `last_derivation_index` needs to be synced
-const KEY_LAST_DERIVATION_INDEX: &str = "last_derivation_index";
+pub(crate) const KEY_LAST_DERIVATION_INDEX: &str = "last_derivation_index";
 
 impl Persister {
     fn get_cached_item_inner(tx: &Transaction, key: &str) -> Result<Option<String>> {
@@ -20,7 +21,11 @@ impl Persister {
         Ok(res.ok())
     }
 
-    fn update_cached_item_inner(tx: &Transaction, key: &str, value: String) -> Result<()> {
+    pub(crate) fn update_cached_item_inner(
+        tx: &Transaction,
+        key: &str,
+        value: String,
+    ) -> Result<()> {
         tx.execute(
             "INSERT OR REPLACE INTO cached_items (key, value) VALUES (?1,?2)",
             (key, value),
@@ -92,7 +97,21 @@ impl Persister {
     }
 
     pub fn set_last_derivation_index(&self, index: u32) -> Result<()> {
-        self.update_cached_item(KEY_LAST_DERIVATION_INDEX, index.to_string())
+        let mut con = self.get_connection()?;
+        let tx = con.transaction_with_behavior(TransactionBehavior::Immediate)?;
+
+        Self::update_cached_item_inner(&tx, KEY_LAST_DERIVATION_INDEX, index.to_string())?;
+        self.commit_outgoing(
+            &tx,
+            LAST_DERIVATION_INDEX_DATA_ID,
+            RecordType::LastDerivationIndex,
+            // insert a mock updated field so that merging with incoming data works as expected
+            Some(vec!["last-derivation-index".to_string()]),
+        )?;
+        tx.commit()?;
+        self.sync_trigger.try_send(())?;
+
+        Ok(())
     }
 
     pub fn get_last_derivation_index(&self) -> Result<Option<u32>> {

lib/core/src/persist/mod.rs

@@ -1,6 +1,6 @@
 mod address;
 mod backup;
-mod cache;
+pub(crate) mod cache;
 pub(crate) mod chain;
 mod migrations;
 pub(crate) mod receive;

lib/core/src/persist/sync.rs

@@ -5,10 +5,10 @@ use rusqlite::{
     named_params, Connection, OptionalExtension, Row, Statement, Transaction, TransactionBehavior,
 };
 
-use super::{PaymentState, Persister};
+use super::{cache::KEY_LAST_DERIVATION_INDEX, PaymentState, Persister};
 use crate::{
     sync::model::{
-        data::{ChainSyncData, ReceiveSyncData, SendSyncData},
+        data::{ChainSyncData, ReceiveSyncData, SendSyncData, LAST_DERIVATION_INDEX_DATA_ID},
         sync::Record,
         RecordType, SyncOutgoingChanges, SyncSettings, SyncState,
     },
@@ -701,4 +701,42 @@ impl Persister {
 
         Ok(())
     }
+
+    pub(crate) fn commit_incoming_address_index(
+        &self,
+        new_address_index: u32,
+        sync_state: SyncState,
+        last_commit_time: Option<u32>,
+    ) -> Result<()> {
+        let mut con = self.get_connection()?;
+        let tx = con.transaction_with_behavior(TransactionBehavior::Immediate)?;
+
+        if let Some(last_commit_time) = last_commit_time {
+            Self::check_commit_update(
+                &tx,
+                &Record::get_id_from_record_type(
+                    RecordType::LastDerivationIndex,
+                    LAST_DERIVATION_INDEX_DATA_ID,
+                ),
+                last_commit_time,
+            )?;
+        }
+
+        Self::update_cached_item_inner(
+            &tx,
+            KEY_LAST_DERIVATION_INDEX,
+            new_address_index.to_string(),
+        )?;
+
+        Self::set_sync_state_stmt(&tx)?.execute(named_params! {
+            ":data_id": &sync_state.data_id,
+            ":record_id": &sync_state.record_id,
+            ":record_revision": &sync_state.record_revision,
+            ":is_local": &sync_state.is_local,
+        })?;
+
+        tx.commit()?;
+
+        Ok(())
+    }
 }

lib/core/src/sync/mod.rs

@@ -9,7 +9,10 @@ use tokio::sync::{watch, Mutex};
 
 use crate::sync::model::sync::{Record, SetRecordRequest, SetRecordStatus};
 use crate::utils;
-use crate::{persist::Persister, prelude::Signer};
+use crate::{
+    persist::{cache::KEY_LAST_DERIVATION_INDEX, Persister},
+    prelude::Signer,
+};
 
 use self::client::SyncerClient;
 use self::model::{
@@ -127,6 +130,9 @@ impl SyncService {
                 is_update,
                 last_commit_time,
             )?,
+            SyncData::LastDerivationIndex(new_address_index) => self
+                .persister
+                .commit_incoming_address_index(new_address_index, sync_state, last_commit_time)?,
         }
         Ok(())
     }
@@ -157,6 +163,12 @@ impl SyncService {
                     .into();
                 SyncData::Chain(chain_data)
             }
+            RecordType::LastDerivationIndex => SyncData::LastDerivationIndex(
+                self.persister
+                    .get_cached_item(KEY_LAST_DERIVATION_INDEX)?
+                    .ok_or(anyhow!("Could not find last derivation index"))?
+                    .parse()?,
+            ),
         };
         Ok(data)
     }
@@ -351,9 +363,9 @@ mod tests {
     use std::{collections::HashMap, sync::Arc};
 
     use crate::{
-        persist::Persister,
+        persist::{cache::KEY_LAST_DERIVATION_INDEX, Persister},
         prelude::{Direction, PaymentState, Signer},
-        sync::model::SyncState,
+        sync::model::{data::LAST_DERIVATION_INDEX_DATA_ID, SyncState},
         test_utils::{
             chain_swap::new_chain_swap,
             persist::{create_persister, new_receive_swap, new_send_swap},
@@ -649,4 +661,89 @@ mod tests {
 
         Ok(())
     }
+
+    #[tokio::test]
+    async fn test_last_derivation_index_update() -> Result<()> {
+        create_persister!(persister);
+        let signer: Arc<Box<dyn Signer>> = Arc::new(Box::new(MockSigner::new()));
+
+        let (incoming_tx, outgoing_records, sync_service) =
+            new_sync_service(persister.clone(), signer.clone())?;
+
+        // Check pull
+        assert_eq!(persister.get_cached_item(KEY_LAST_DERIVATION_INDEX)?, None);
+
+        let new_last_derivation_index = 10;
+        let data = SyncData::LastDerivationIndex(new_last_derivation_index);
+        incoming_tx
+            .send(Record::new(data, 0, signer.clone())?)
+            .await?;
+
+        sync_service.pull().await?;
+
+        assert_eq!(
+            persister.get_cached_item(KEY_LAST_DERIVATION_INDEX)?,
+            Some(new_last_derivation_index.to_string())
+        );
+
+        // Check push
+        let new_last_derivation_index = 20;
+        persister.set_last_derivation_index(new_last_derivation_index)?;
+
+        sync_service.push().await?;
+
+        let outgoing = outgoing_records.lock().await;
+        let record = get_outgoing_record(
+            persister.clone(),
+            &outgoing,
+            LAST_DERIVATION_INDEX_DATA_ID,
+            RecordType::LastDerivationIndex,
+        )?;
+        let decrypted_record = record.clone().decrypt(signer.clone())?;
+        match decrypted_record.data {
+            SyncData::LastDerivationIndex(last_derivation_index) => {
+                assert_eq!(last_derivation_index, new_last_derivation_index);
+            }
+            _ => {
+                return Err(anyhow::anyhow!("Unexpected sync data type received."));
+            }
+        }
+
+        // Check pull with merge
+        let new_local_last_derivation_index = 30;
+        persister.set_last_derivation_index(new_local_last_derivation_index)?;
+
+        let new_remote_last_derivation_index = 25;
+        let data = SyncData::LastDerivationIndex(new_remote_last_derivation_index);
+        incoming_tx
+            .send(Record::new(data, 0, signer.clone())?)
+            .await?;
+
+        sync_service.pull().await?;
+
+        // Newer one is persisted (local > remote)
+        assert_eq!(
+            persister.get_cached_item(KEY_LAST_DERIVATION_INDEX)?,
+            Some(new_local_last_derivation_index.to_string())
+        );
+
+        let new_local_last_derivation_index = 35;
+        persister.set_last_derivation_index(new_local_last_derivation_index)?;
+
+        let new_remote_last_derivation_index = 40;
+        let data = SyncData::LastDerivationIndex(new_remote_last_derivation_index);
+        incoming_tx
+            .send(Record::new(data, 2, signer.clone())?)
+            .await?;
+
+        sync_service.pull().await?;
+
+        // Newer one is persisted (remote > local)
+        assert_eq!(
+            persister.get_cached_item(KEY_LAST_DERIVATION_INDEX)?,
+            Some(new_remote_last_derivation_index.to_string())
+        );
+
+        Ok(())
+    }
 }

lib/core/src/sync/model/data.rs

@@ -2,6 +2,8 @@ use serde::{Deserialize, Serialize};
 
 use crate::prelude::{ChainSwap, Direction, ReceiveSwap, SendSwap};
 
+pub(crate) const LAST_DERIVATION_INDEX_DATA_ID: &str = "last-derivation-index";
+
 #[derive(Serialize, Deserialize, Clone, Debug)]
 pub(crate) struct ChainSyncData {
     pub(crate) swap_id: String,
@@ -155,6 +157,7 @@ pub(crate) enum SyncData {
     Chain(ChainSyncData),
     Send(SendSyncData),
     Receive(ReceiveSyncData),
+    LastDerivationIndex(u32),
 }
 
 impl SyncData {
@@ -163,6 +166,7 @@ impl SyncData {
             SyncData::Chain(chain_data) => &chain_data.swap_id,
             SyncData::Send(send_data) => &send_data.swap_id,
             SyncData::Receive(receive_data) => &receive_data.swap_id,
+            SyncData::LastDerivationIndex(_) => LAST_DERIVATION_INDEX_DATA_ID,
         }
     }
 
@@ -181,6 +185,12 @@ impl SyncData {
             (SyncData::Receive(ref mut base), SyncData::Receive(other)) => {
                 base.merge(other, updated_fields)
             }
+            (
+                SyncData::LastDerivationIndex(our_index),
+                SyncData::LastDerivationIndex(their_index),
+            ) => {
+                *our_index = std::cmp::max(*their_index, *our_index);
+            }
             _ => return Err(anyhow::anyhow!("Cannot merge data from two separate types")),
         };
         Ok(())

lib/core/src/sync/model/mod.rs

@@ -26,6 +26,7 @@ pub(crate) enum RecordType {
     Receive = 0,
     Send = 1,
     Chain = 2,
+    LastDerivationIndex = 3,
 }
 
 impl ToSql for RecordType {
@@ -41,6 +42,7 @@ impl FromSql for RecordType {
                 0 => Ok(Self::Receive),
                 1 => Ok(Self::Send),
                 2 => Ok(Self::Chain),
+                3 => Ok(Self::LastDerivationIndex),
                 _ => Err(FromSqlError::OutOfRange(i)),
             },
             _ => Err(FromSqlError::InvalidType),
@@ -105,6 +107,7 @@ impl Record {
             SyncData::Chain(_) => "chain-swap",
             SyncData::Send(_) => "send-swap",
             SyncData::Receive(_) => "receive-swap",
+            SyncData::LastDerivationIndex(_) => "wallet-address",
         }
         .to_string();
         Self::id(prefix, data.id())
@@ -115,6 +118,7 @@ impl Record {
             RecordType::Chain => "chain-swap",
             RecordType::Send => "send-swap",
             RecordType::Receive => "receive-swap",
+            RecordType::LastDerivationIndex => "wallet-address",
         }
         .to_string();
         Self::id(prefix, data_id)