[sql-32] accounts: add migration code from kvdb to SQL

.gitignore

@@ -15,6 +15,9 @@ itest/itest.test
 itest/.logs
 itest/*.log
 
+# Failed rapid test runs
+accounts/testdata/rapid/*
+
 vendor
 *.idea
 *.run

accounts/sql_migration.go

@@ -0,0 +1,233 @@
+package accounts
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+	"math"
+	"reflect"
+	"time"
+
+	"github.com/davecgh/go-spew/spew"
+	"github.com/lightninglabs/lightning-terminal/db/sqlc"
+	"github.com/pmezard/go-difflib/difflib"
+)
+
+var (
+	// ErrMigrationMismatch is returned when the migrated account does not
+	// match the original account.
+	ErrMigrationMismatch = fmt.Errorf("migrated account does not match " +
+		"original account")
+)
+
+// MigrateAccountStoreToSQL runs the migration of all accounts and indices from
+// the KV database to the SQL database. The migration is done in a single
+// transaction to ensure that all accounts are migrated or none at all.
+func MigrateAccountStoreToSQL(ctx context.Context, kvStore *BoltStore,
+	tx SQLQueries) error {
+
+	log.Infof("Starting migration of the KV accounts store to SQL")
+
+	err := migrateAccountsToSQL(ctx, kvStore, tx)
+	if err != nil {
+		return fmt.Errorf("unsuccessful migration of accounts to "+
+			"SQL: %w", err)
+	}
+
+	err = migrateAccountsIndicesToSQL(ctx, kvStore, tx)
+	if err != nil {
+		return fmt.Errorf("unsuccessful migration of account indices "+
+			"to SQL: %w", err)
+	}
+
+	return nil
+}
+
+// migrateAccountsToSQL runs the migration of all accounts from the KV database
+// to the SQL database. The migration is done in a single transaction to ensure
+// that all accounts are migrated or none at all.
+func migrateAccountsToSQL(ctx context.Context, kvStore *BoltStore,
+	tx SQLQueries) error {
+
+	log.Infof("Starting migration of accounts from KV to SQL")
+
+	kvAccounts, err := kvStore.Accounts(ctx)
+	if err != nil {
+		return err
+	}
+
+	for _, kvAccount := range kvAccounts {
+		migratedAccountID, err := migrateSingleAccountToSQL(
+			ctx, tx, kvAccount,
+		)
+		if err != nil {
+			return fmt.Errorf("unable to migrate account(%v): %w",
+				kvAccount.ID, err)
+		}
+
+		migratedAccount, err := getAndMarshalAccount(
+			ctx, tx, migratedAccountID,
+		)
+		if err != nil {
+			return fmt.Errorf("unable to fetch migrated "+
+				"account(%v): %w", kvAccount.ID, err)
+		}
+
+		overrideAccountTimeZone(kvAccount)
+		overrideAccountTimeZone(migratedAccount)
+
+		if !reflect.DeepEqual(kvAccount, migratedAccount) {
+			diff := difflib.UnifiedDiff{
+				A: difflib.SplitLines(
+					spew.Sdump(kvAccount),
+				),
+				B: difflib.SplitLines(
+					spew.Sdump(migratedAccount),
+				),
+				FromFile: "Expected",
+				FromDate: "",
+				ToFile:   "Actual",
+				ToDate:   "",
+				Context:  3,
+			}
+			diffText, _ := difflib.GetUnifiedDiffString(diff)
+
+			return fmt.Errorf("%w: %v.\n%v", ErrMigrationMismatch,
+				kvAccount.ID, diffText)
+		}
+	}
+
+	log.Infof("All accounts migrated from KV to SQL. Total number of "+
+		"accounts migrated: %d", len(kvAccounts))
+
+	return nil
+}
+
+// migrateSingleAccountToSQL runs the migration for a single account from the
+// KV database to the SQL database.
+func migrateSingleAccountToSQL(ctx context.Context,
+	tx SQLQueries, account *OffChainBalanceAccount) (int64, error) {
+
+	accountAlias, err := account.ID.ToInt64()
+	if err != nil {
+		return 0, err
+	}
+
+	insertAccountParams := sqlc.InsertAccountParams{
+		Type:               int16(account.Type),
+		InitialBalanceMsat: int64(account.InitialBalance),
+		CurrentBalanceMsat: account.CurrentBalance,
+		LastUpdated:        account.LastUpdate.UTC(),
+		Alias:              accountAlias,
+		Expiration:         account.ExpirationDate.UTC(),
+		Label: sql.NullString{
+			String: account.Label,
+			Valid:  len(account.Label) > 0,
+		},
+	}
+
+	sqlId, err := tx.InsertAccount(ctx, insertAccountParams)
+	if err != nil {
+		return 0, err
+	}
+
+	for hash := range account.Invoices {
+		addInvoiceParams := sqlc.AddAccountInvoiceParams{
+			AccountID: sqlId,
+			Hash:      hash[:],
+		}
+
+		err = tx.AddAccountInvoice(ctx, addInvoiceParams)
+		if err != nil {
+			return sqlId, err
+		}
+	}
+
+	for hash, paymentEntry := range account.Payments {
+		upsertPaymentParams := sqlc.UpsertAccountPaymentParams{
+			AccountID:      sqlId,
+			Hash:           hash[:],
+			Status:         int16(paymentEntry.Status),
+			FullAmountMsat: int64(paymentEntry.FullAmount),
+		}
+
+		err = tx.UpsertAccountPayment(ctx, upsertPaymentParams)
+		if err != nil {
+			return sqlId, err
+		}
+	}
+
+	return sqlId, nil
+}
+
+// migrateAccountsIndicesToSQL runs the migration for the account indices from
+// the KV database to the SQL database.
+func migrateAccountsIndicesToSQL(ctx context.Context, kvStore *BoltStore,
+	tx SQLQueries) error {
+
+	log.Infof("Starting migration of accounts indices from KV to SQL")
+
+	addIndex, settleIndex, err := kvStore.LastIndexes(ctx)
+	if errors.Is(err, ErrNoInvoiceIndexKnown) {
+		log.Infof("No indices found in KV store, skipping migration")
+		return nil
+	} else if err != nil {
+		return err
+	}
+
+	if addIndex > math.MaxInt64 {
+		return fmt.Errorf("%s:%v is above max int64 value",
+			addIndexName, addIndex)
+	}
+
+	if settleIndex > math.MaxInt64 {
+		return fmt.Errorf("%s:%v is above max int64 value",
+			settleIndexName, settleIndex)
+	}
+
+	setAddIndexParams := sqlc.SetAccountIndexParams{
+		Name:  addIndexName,
+		Value: int64(addIndex),
+	}
+
+	err = tx.SetAccountIndex(ctx, setAddIndexParams)
+	if err != nil {
+		return err
+	}
+
+	setSettleIndexParams := sqlc.SetAccountIndexParams{
+		Name:  settleIndexName,
+		Value: int64(settleIndex),
+	}
+
+	err = tx.SetAccountIndex(ctx, setSettleIndexParams)
+	if err != nil {
+		return err
+	}
+
+	log.Infof("Successfully migratated accounts indices from KV to SQL")
+
+	return nil
+}
+
+// overrideAccountTimeZone overrides the time zone of the account to the local
+// time zone and chops off the nanosecond part for comparison. This is needed
+// because KV database stores times as-is which as an unwanted side effect would
+// fail migration due to time comparison expecting both the original and
+// migrated accounts to be in the same local time zone and in microsecond
+// precision. Note that PostgresSQL stores times in microsecond precision while
+// SQLite can store times in nanosecond precision if using TEXT storage class.
+func overrideAccountTimeZone(account *OffChainBalanceAccount) {
+	fixTime := func(t time.Time) time.Time {
+		return t.In(time.Local).Truncate(time.Microsecond)
+	}
+
+	if !account.ExpirationDate.IsZero() {
+		account.ExpirationDate = fixTime(account.ExpirationDate)
+	}
+
+	if !account.LastUpdate.IsZero() {
+		account.LastUpdate = fixTime(account.LastUpdate)
+	}
+}