server: Minor updates to the seeding process

server/app/com/xsn/explorer/data/anorm/BalancePostgresDataHandler.scala

@@ -18,7 +18,7 @@ class BalancePostgresDataHandler @Inject() (
     extends BalanceBlockingDataHandler
     with AnormPostgresDataHandler {
 
-  override def upsert(balance: Balance): ApplicationResult[Balance] = withConnection { implicit conn =>
+  override def upsert(balance: Balance): ApplicationResult[Balance] = withTransaction { implicit conn =>
     val maybe = balancePostgresDAO.upsert(balance)
 
     Or.from(maybe, One(BalanceUnknownError))

server/app/com/xsn/explorer/data/anorm/DatabasePostgresSeeder.scala

@@ -18,13 +18,13 @@ class DatabasePostgresSeeder @Inject() (
     override val database: Database,
     blockPostgresDAO: BlockPostgresDAO,
     transactionPostgresDAO: TransactionPostgresDAO,
-    addressPostgresDAO: BalancePostgresDAO)
+    balancePostgresDAO: BalancePostgresDAO)
     extends DatabaseBlockingSeeder
     with AnormPostgresDataHandler {
 
   private val logger = LoggerFactory.getLogger(this.getClass)
 
-  override def firstBlock(command: CreateBlockCommand): ApplicationResult[Unit] = database.withTransaction { implicit conn =>
+  override def firstBlock(command: CreateBlockCommand): ApplicationResult[Unit] = withTransaction { implicit conn =>
     val result = upsertBlockCascade(command)
 
     result
@@ -78,28 +78,17 @@ class DatabasePostgresSeeder @Inject() (
   private def upsertBlockCascade(command: CreateBlockCommand)(implicit conn: Connection): Option[Unit] = {
     for {
       // block
-      _ <- blockPostgresDAO
-            .delete(command.block.hash)
-            .orElse { Some(command.block) }
+      _ <- deleteBlockCascade(command.block)
+          .orElse(Some(()))
+
       _ <- blockPostgresDAO.insert(command.block)
 
       // transactions
       _ <- command.transactions.map(tx => transactionPostgresDAO.upsert(tx)).everything
 
       // balances
-      _ <- spendMap(command.transactions)
-          .map { case (address, value) =>
-            val balance = Balance(address, spent = value)
-            addressPostgresDAO.upsert(balance)
-          }
-          .toList
-          .everything
-
-      _ <- receiveMap(command.transactions)
-          .map { case (address, value) =>
-            val balance = Balance(address, received = value)
-            addressPostgresDAO.upsert(balance)
-          }
+      _ <- balances(command.transactions)
+          .map { b => balancePostgresDAO.upsert(b) }
           .toList
           .everything
     } yield ()
@@ -114,19 +103,9 @@ class DatabasePostgresSeeder @Inject() (
       deletedTransactions = transactionPostgresDAO.deleteBy(block.hash)
 
       // balances
-      _ <- spendMap(deletedTransactions)
-          .map { case (address, value) =>
-            val balance = Balance(address, spent = -value)
-            addressPostgresDAO.upsert(balance)
-          }
-          .toList
-          .everything
-
-      _ <- receiveMap(deletedTransactions)
-          .map { case (address, value) =>
-            val balance = Balance(address, received = -value)
-            addressPostgresDAO.upsert(balance)
-          }
+      _ <- balances(deletedTransactions)
+          .map { b => b.copy(spent = -b.spent, received = -b.received) }
+          .map { b => balancePostgresDAO.upsert(b) }
           .toList
           .everything
     } yield ()
@@ -158,4 +137,23 @@ class DatabasePostgresSeeder @Inject() (
         .groupBy(_._1)
         .mapValues { list => list.map(_._2).sum }
   }
+
+  private def balances(transactions: List[Transaction]) = {
+    val spentList = spendMap(transactions).map { case (address, spent) =>
+      Balance(address, spent = spent)
+    }
+
+    val receiveList = receiveMap(transactions).map { case (address, received) =>
+      Balance(address, received = received)
+    }
+
+    (spentList ++ receiveList)
+        .groupBy(_.address)
+        .mapValues { _.reduce(mergeBalances) }
+        .values
+  }
+
+  def mergeBalances(a: Balance, b: Balance): Balance = {
+    Balance(a.address, spent = a.spent + b.spent, received = a.received + b.received)
+  }
 }

server/app/com/xsn/explorer/data/anorm/dao/BalancePostgresDAO.scala

@@ -7,16 +7,23 @@ import anorm._
 import com.alexitc.playsonify.models.{Count, FieldOrdering, PaginatedQuery}
 import com.xsn.explorer.data.anorm.interpreters.FieldOrderingSQLInterpreter
 import com.xsn.explorer.data.anorm.parsers.BalanceParsers._
-import com.xsn.explorer.models.{Address, Balance}
 import com.xsn.explorer.models.fields.BalanceField
+import com.xsn.explorer.models.{Address, Balance}
 import org.slf4j.LoggerFactory
 
 class BalancePostgresDAO @Inject() (fieldOrderingSQLInterpreter: FieldOrderingSQLInterpreter) {
 
   private val logger = LoggerFactory.getLogger(this.getClass)
 
-  def upsert(balance: Balance)(implicit conn: Connection): Option[Balance] = {
-    val createdBalance = SQL(
+  /**
+   * create or update the balance for an address
+   *
+   * NOTE: ensure the connection has an open transaction, this is required
+   *       until the debug log is removed.
+   */
+  def upsert(partial: Balance)(implicit conn: Connection): Option[Balance] = {
+    val computedMaybe = computeBalance(partial.address)
+    val updatedBalance = SQL(
       """
         |INSERT INTO balances
         |  (address, received, spent)
@@ -28,19 +35,19 @@ class BalancePostgresDAO @Inject() (fieldOrderingSQLInterpreter: FieldOrderingSQ
         |RETURNING address, received, spent
       """.stripMargin
     ).on(
-      'address -> balance.address.string,
-      'received -> balance.received,
-      'spent -> balance.spent,
+      'address -> partial.address.string,
+      'received -> partial.received,
+      'spent -> partial.spent,
     ).as(parseBalance.singleOpt).flatten
 
     for {
-      balance <- createdBalance
-      computed <- computeBalance(balance.address) if computed != balance
+      balance <- updatedBalance
+      computed <- computedMaybe if computed != balance
     } {
       logger.warn(s"CORRUPTED_BALANCE, expected spent = ${computed.spent}, actual = ${balance.spent}, expected received = ${computed.received}, actual = ${balance.received}")
     }
 
-    createdBalance
+    updatedBalance
   }
 
   private def computeBalance(address: Address)(implicit conn: Connection) = {