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package files
import (
"errors"
"fmt"
"os"
"strings"
"codeberg.org/lindenii/furgit/objectid"
"codeberg.org/lindenii/furgit/ref/refname"
"codeberg.org/lindenii/furgit/refstore"
)
type txKind uint8
const (
txCreate txKind = iota
txUpdate
txDelete
txVerify
txCreateSymbolic
txUpdateSymbolic
txDeleteSymbolic
txVerifySymbolic
)
type txOp struct {
name string
kind txKind
newID objectid.ObjectID
oldID objectid.ObjectID
newTarget string
oldTarget string
}
type directKind uint8
const (
directMissing directKind = iota
directDetached
directSymbolic
)
type directRef struct {
kind directKind
name string
id objectid.ObjectID
target string
isLoose bool
isPacked bool
}
type resolvedWriteTarget struct {
name string
loc refPath
ref directRef
}
type preparedTxOp struct {
op txOp
target resolvedWriteTarget
}
type Transaction struct {
store *Store
ops []txOp
closed bool
}
var _ refstore.Transaction = (*Transaction)(nil)
// BeginTransaction creates one new files transaction.
//
//nolint:ireturn
func (store *Store) BeginTransaction() (refstore.Transaction, error) {
return &Transaction{
store: store,
ops: make([]txOp, 0, 8),
}, nil
}
func (tx *Transaction) Create(name string, newID objectid.ObjectID) error {
return tx.queue(txOp{name: name, kind: txCreate, newID: newID})
}
func (tx *Transaction) Update(name string, newID, oldID objectid.ObjectID) error {
return tx.queue(txOp{name: name, kind: txUpdate, newID: newID, oldID: oldID})
}
func (tx *Transaction) Delete(name string, oldID objectid.ObjectID) error {
return tx.queue(txOp{name: name, kind: txDelete, oldID: oldID})
}
func (tx *Transaction) Verify(name string, oldID objectid.ObjectID) error {
return tx.queue(txOp{name: name, kind: txVerify, oldID: oldID})
}
func (tx *Transaction) CreateSymbolic(name, newTarget string) error {
return tx.queue(txOp{name: name, kind: txCreateSymbolic, newTarget: newTarget})
}
func (tx *Transaction) UpdateSymbolic(name, newTarget, oldTarget string) error {
return tx.queue(txOp{name: name, kind: txUpdateSymbolic, newTarget: newTarget, oldTarget: oldTarget})
}
func (tx *Transaction) DeleteSymbolic(name, oldTarget string) error {
return tx.queue(txOp{name: name, kind: txDeleteSymbolic, oldTarget: oldTarget})
}
func (tx *Transaction) VerifySymbolic(name, oldTarget string) error {
return tx.queue(txOp{name: name, kind: txVerifySymbolic, oldTarget: oldTarget})
}
func (tx *Transaction) Commit() error {
err := tx.ensureOpen()
if err != nil {
return err
}
prepared, err := tx.prepare()
if err != nil {
tx.closed = true
return err
}
defer func() {
_ = tx.cleanup(prepared)
}()
for _, item := range prepared {
if item.op.kind == txDelete || item.op.kind == txDeleteSymbolic || item.op.kind == txVerify || item.op.kind == txVerifySymbolic {
continue
}
err = tx.writeLoose(item)
if err != nil {
tx.closed = true
return err
}
}
err = tx.applyPackedDeletes(prepared)
if err != nil {
tx.closed = true
return err
}
for _, item := range prepared {
switch item.op.kind {
case txDelete, txDeleteSymbolic:
if item.target.ref.isLoose {
err = tx.store.rootFor(item.target.loc.root).Remove(item.target.loc.path)
if err != nil && !errors.Is(err, os.ErrNotExist) {
tx.closed = true
return err
}
tx.tryRemoveEmptyParents(item.target.name)
}
case txCreate, txUpdate, txVerify, txCreateSymbolic, txUpdateSymbolic, txVerifySymbolic:
}
}
tx.closed = true
return nil
}
func (tx *Transaction) Abort() error {
err := tx.ensureOpen()
if err != nil {
return err
}
tx.closed = true
return nil
}
func (tx *Transaction) ensureOpen() error {
if tx.closed {
return fmt.Errorf("refstore/files: transaction already closed")
}
return nil
}
func (tx *Transaction) queue(op txOp) error {
err := tx.ensureOpen()
if err != nil {
return err
}
err = tx.validateOp(op)
if err != nil {
return err
}
tx.ops = append(tx.ops, op)
return nil
}
func (tx *Transaction) validateOp(op txOp) error {
if op.name == "" {
return fmt.Errorf("refstore/files: empty reference name")
}
switch op.kind {
case txCreate, txUpdate:
err := refname.ValidateUpdateName(op.name, true)
if err != nil {
return err
}
if op.newID.Size() == 0 {
return objectid.ErrInvalidAlgorithm
}
case txDelete, txVerify:
err := refname.ValidateUpdateName(op.name, false)
if err != nil {
return err
}
if op.oldID.Size() == 0 {
return objectid.ErrInvalidAlgorithm
}
case txCreateSymbolic, txUpdateSymbolic:
err := refname.ValidateUpdateName(op.name, true)
if err != nil {
return err
}
if strings.TrimSpace(op.newTarget) == "" {
return fmt.Errorf("refstore/files: empty symbolic target")
}
err = refname.ValidateSymbolicTarget(op.name, strings.TrimSpace(op.newTarget))
if err != nil {
return err
}
case txDeleteSymbolic, txVerifySymbolic:
err := refname.ValidateUpdateName(op.name, false)
if err != nil {
return err
}
default:
return fmt.Errorf("refstore/files: unsupported transaction operation %d", op.kind)
}
if op.kind == txUpdateSymbolic || op.kind == txDeleteSymbolic || op.kind == txVerifySymbolic {
if strings.TrimSpace(op.oldTarget) == "" {
return fmt.Errorf("refstore/files: empty symbolic old target")
}
}
return nil
}
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