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package memory
import (
objectid "codeberg.org/lindenii/furgit/object/id"
refstore "codeberg.org/lindenii/furgit/ref/store"
)
// Transaction stages in-memory updates for one atomic commit.
type Transaction struct {
store *Store
ops []queuedUpdate
}
var _ refstore.Transaction = (*Transaction)(nil)
// BeginTransaction creates one new in-memory transaction.
//
//nolint:ireturn
func (store *Store) BeginTransaction() (refstore.Transaction, error) {
return &Transaction{
store: store,
ops: make([]queuedUpdate, 0, 8),
}, nil
}
// Create queues a detached reference creation.
func (tx *Transaction) Create(name string, newID objectid.ObjectID) error {
return tx.queue(queuedUpdate{name: name, kind: updateCreate, newID: newID})
}
// Update queues a detached reference update.
func (tx *Transaction) Update(name string, newID, oldID objectid.ObjectID) error {
return tx.queue(queuedUpdate{name: name, kind: updateReplace, newID: newID, oldID: oldID})
}
// Delete queues a detached reference deletion.
func (tx *Transaction) Delete(name string, oldID objectid.ObjectID) error {
return tx.queue(queuedUpdate{name: name, kind: updateDelete, oldID: oldID})
}
// Verify queues a detached reference verification.
func (tx *Transaction) Verify(name string, oldID objectid.ObjectID) error {
return tx.queue(queuedUpdate{name: name, kind: updateVerify, oldID: oldID})
}
// CreateSymbolic queues a symbolic reference creation.
func (tx *Transaction) CreateSymbolic(name, newTarget string) error {
return tx.queue(queuedUpdate{name: name, kind: updateCreateSymbolic, newTarget: newTarget})
}
// UpdateSymbolic queues a symbolic reference update.
func (tx *Transaction) UpdateSymbolic(name, newTarget, oldTarget string) error {
return tx.queue(queuedUpdate{name: name, kind: updateReplaceSymbolic, newTarget: newTarget, oldTarget: oldTarget})
}
// DeleteSymbolic queues a symbolic reference deletion.
func (tx *Transaction) DeleteSymbolic(name, oldTarget string) error {
return tx.queue(queuedUpdate{name: name, kind: updateDeleteSymbolic, oldTarget: oldTarget})
}
// VerifySymbolic queues a symbolic reference verification.
func (tx *Transaction) VerifySymbolic(name, oldTarget string) error {
return tx.queue(queuedUpdate{name: name, kind: updateVerifySymbolic, oldTarget: oldTarget})
}
// Commit validates and applies the queued updates atomically.
func (tx *Transaction) Commit() error {
tx.store.mu.Lock()
defer tx.store.mu.Unlock()
prepared, err := prepareUpdates(tx.store.refs, tx.ops)
if err != nil {
return err
}
next := cloneRefs(tx.store.refs)
applyPreparedUpdates(next, prepared)
tx.store.refs = next
return nil
}
// Abort abandons the transaction.
func (tx *Transaction) Abort() error {
return nil
}
func (tx *Transaction) queue(op queuedUpdate) error {
err := validateQueuedUpdate(op)
if err != nil {
return err
}
tx.ops = append(tx.ops, op)
return nil
}
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