Fix edit failing when pg transaction is aborted (#294)

pkg/manager/edit/edit.go

@@ -120,6 +120,11 @@ func ApplyEdit(fac models.Repo, editID uuid.UUID, immediate bool) (*models.Edit,
 
 		success := true
 		if err := applyer.apply(); err != nil {
+			// Failed apply, so we reset the txn in case it was a postgres error which would block further queries
+			if err := fac.ResetTxn(); err != nil {
+				return fmt.Errorf("Failed to reset failed transaction: %w", err)
+			}
+
 			success = false
 			commentID, _ := uuid.NewV4()
 			text := "###### Edit application failed: ######\n"
@@ -130,6 +135,7 @@ func ApplyEdit(fac models.Repo, editID uuid.UUID, immediate bool) (*models.Edit,
 			}
 			modUser := user.GetModUser(fac)
 			comment := models.NewEditComment(commentID, modUser, edit, text)
+
 			if err := eqb.CreateComment(*comment); err != nil {
 				return err
 			}

pkg/sqlx/transaction.go

@@ -2,6 +2,7 @@ package sqlx
 
 import (
 	"database/sql"
+	"fmt"
 
 	"github.com/jmoiron/sqlx"
 	"github.com/stashapp/stash-box/pkg/models"
@@ -39,17 +40,18 @@ func (m *txnState) WithTxn(fn func() error) (err error) {
 	m.tx = tx
 
 	defer func() {
+		transaction := m.tx
 		m.tx = nil
 		//nolint:gocritic
 		if p := recover(); p != nil {
 			// a panic occurred, rollback and repanic
-			_ = tx.Rollback()
+			_ = transaction.Rollback()
 			panic(p)
 		} else if err != nil {
 			// something went wrong, rollback
-			_ = tx.Rollback()
+			_ = transaction.Rollback()
 		} else {
-			err = tx.Commit()
+			err = transaction.Commit()
 		}
 	}()
 
@@ -57,6 +59,24 @@ func (m *txnState) WithTxn(fn func() error) (err error) {
 	return
 }
 
+func (m *txnState) ResetTxn() error {
+	if !m.InTxn() {
+		return fmt.Errorf("not in transaction")
+	}
+
+	if err := m.tx.Rollback(); err != nil {
+		return err
+	}
+
+	tx, err := m.rootDB.Beginx()
+	if err != nil {
+		return err
+	}
+
+	m.tx = tx
+	return nil
+}
+
 func (m *txnState) InTxn() bool {
 	return m.tx != nil
 }

pkg/txn/state.go

@@ -14,6 +14,7 @@ type Mgr interface {
 type State interface {
 	WithTxn(fn func() error) error
 	InTxn() bool
+	ResetTxn() error
 }
 
 func MustBeIn(m State) {