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package memory
import (
objectid "codeberg.org/lindenii/furgit/object/id"
refstore "codeberg.org/lindenii/furgit/ref/store"
)
// Batch stages in-memory updates for one subset commit.
type Batch struct {
store *Store
ops []queuedUpdate
}
var _ refstore.Batch = (*Batch)(nil)
// BeginBatch creates one new in-memory batch.
//
//nolint:ireturn
func (store *Store) BeginBatch() (refstore.Batch, error) {
return &Batch{
store: store,
ops: make([]queuedUpdate, 0, 8),
}, nil
}
// Create queues a detached reference creation.
func (batch *Batch) Create(name string, newID objectid.ObjectID) error {
return batch.queue(queuedUpdate{name: name, kind: updateCreate, newID: newID})
}
// Update queues a detached reference update.
func (batch *Batch) Update(name string, newID, oldID objectid.ObjectID) error {
return batch.queue(queuedUpdate{name: name, kind: updateReplace, newID: newID, oldID: oldID})
}
// Delete queues a detached reference deletion.
func (batch *Batch) Delete(name string, oldID objectid.ObjectID) error {
return batch.queue(queuedUpdate{name: name, kind: updateDelete, oldID: oldID})
}
// Verify queues a detached reference verification.
func (batch *Batch) Verify(name string, oldID objectid.ObjectID) error {
return batch.queue(queuedUpdate{name: name, kind: updateVerify, oldID: oldID})
}
// CreateSymbolic queues a symbolic reference creation.
func (batch *Batch) CreateSymbolic(name, newTarget string) error {
return batch.queue(queuedUpdate{name: name, kind: updateCreateSymbolic, newTarget: newTarget})
}
// UpdateSymbolic queues a symbolic reference update.
func (batch *Batch) UpdateSymbolic(name, newTarget, oldTarget string) error {
return batch.queue(queuedUpdate{name: name, kind: updateReplaceSymbolic, newTarget: newTarget, oldTarget: oldTarget})
}
// DeleteSymbolic queues a symbolic reference deletion.
func (batch *Batch) DeleteSymbolic(name, oldTarget string) error {
return batch.queue(queuedUpdate{name: name, kind: updateDeleteSymbolic, oldTarget: oldTarget})
}
// VerifySymbolic queues a symbolic reference verification.
func (batch *Batch) VerifySymbolic(name, oldTarget string) error {
return batch.queue(queuedUpdate{name: name, kind: updateVerifySymbolic, oldTarget: oldTarget})
}
// Apply validates queued operations,
// drops rejected operations,
// and applies the remaining compatible set.
// Concurrent readers observe
// either the pre-Apply state
// or the post-Apply state.
func (batch *Batch) Apply() ([]refstore.BatchResult, error) {
results := make([]refstore.BatchResult, len(batch.ops))
remainingIdx := make([]int, 0, len(batch.ops))
remainingOps := make([]queuedUpdate, 0, len(batch.ops))
seenTargets := make(map[string]struct{}, len(batch.ops))
batch.store.mu.Lock()
defer batch.store.mu.Unlock()
for i, op := range batch.ops {
results[i].Name = op.name
target, err := resolveQueuedUpdateTarget(batch.store.refs, op)
if err != nil {
if isBatchRejected(err) {
results[i].Status = refstore.BatchStatusRejected
results[i].Error = batchResultError(err)
continue
}
results[i].Status = refstore.BatchStatusFatal
results[i].Error = batchResultError(err)
for j := i + 1; j < len(results); j++ {
results[j].Name = batch.ops[j].name
results[j].Status = refstore.BatchStatusNotAttempted
results[j].Error = batchResultError(err)
}
return results, err
}
if _, exists := seenTargets[target.name]; exists {
results[i].Status = refstore.BatchStatusRejected
results[i].Error = &refstore.DuplicateUpdateError{}
continue
}
seenTargets[target.name] = struct{}{}
remainingIdx = append(remainingIdx, i)
remainingOps = append(remainingOps, op)
}
for len(remainingOps) > 0 {
prepared, err := prepareUpdates(batch.store.refs, remainingOps)
if err == nil {
next := cloneRefs(batch.store.refs)
applyPreparedUpdates(next, prepared)
batch.store.refs = next
for _, idx := range remainingIdx {
results[idx].Status = refstore.BatchStatusApplied
}
return results, nil
}
if !isBatchRejected(err) {
fatalName := batchResultName(err)
fatalMarked := false
for i, idx := range remainingIdx {
if !fatalMarked && remainingOps[i].name == fatalName && fatalName != "" {
results[idx].Status = refstore.BatchStatusFatal
results[idx].Error = batchResultError(err)
fatalMarked = true
continue
}
results[idx].Status = refstore.BatchStatusNotAttempted
results[idx].Error = batchResultError(err)
}
return results, err
}
name := batchResultName(err)
rejectedAt := -1
for i, op := range remainingOps {
if op.name == name {
rejectedAt = i
break
}
}
if rejectedAt < 0 {
for _, idx := range remainingIdx {
results[idx].Status = refstore.BatchStatusNotAttempted
results[idx].Error = batchResultError(err)
}
return results, err
}
results[remainingIdx[rejectedAt]].Status = refstore.BatchStatusRejected
results[remainingIdx[rejectedAt]].Error = batchResultError(err)
remainingIdx = append(remainingIdx[:rejectedAt], remainingIdx[rejectedAt+1:]...)
remainingOps = append(remainingOps[:rejectedAt], remainingOps[rejectedAt+1:]...)
}
return results, nil
}
// Abort abandons the batch.
func (batch *Batch) Abort() error {
return nil
}
func (batch *Batch) queue(op queuedUpdate) error {
err := validateQueuedUpdate(op)
if err != nil {
return err
}
batch.ops = append(batch.ops, op)
return nil
}
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