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repository_iterator.go
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repository_iterator.go
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package ref
import (
"context"
"errors"
"github.com/treeverse/lakefs/pkg/graveler"
"github.com/treeverse/lakefs/pkg/kv"
)
type RepositoryIterator struct {
ctx context.Context
it kv.MessageIterator
err error
value *graveler.RepositoryRecord
store kv.Store
closed bool
}
func NewRepositoryIterator(ctx context.Context, store kv.Store) (*RepositoryIterator, error) {
it, err := kv.NewPrimaryIterator(ctx, store, (&graveler.RepositoryData{}).ProtoReflect().Type(), graveler.RepositoriesPartition(), []byte(graveler.RepoPath("")), kv.IteratorOptionsAfter([]byte{}))
if err != nil {
return nil, err
}
return &RepositoryIterator{
ctx: ctx,
it: it,
store: store,
closed: false,
}, nil
}
func (ri *RepositoryIterator) Next() bool {
if ri.Err() != nil || ri.closed {
return false
}
if !ri.it.Next() {
ri.value = nil
return false
}
e := ri.it.Entry()
if e == nil {
ri.err = graveler.ErrInvalid
return false
}
repo, ok := e.Value.(*graveler.RepositoryData)
if repo == nil || !ok {
ri.err = graveler.ErrReadingFromStore
return false
}
ri.value = graveler.RepoFromProto(repo)
return true
}
func (ri *RepositoryIterator) SeekGE(id graveler.RepositoryID) {
if errors.Is(ri.Err(), kv.ErrClosedEntries) {
return
}
ri.Close()
ri.it, ri.err = kv.NewPrimaryIterator(ri.ctx, ri.store, (&graveler.RepositoryData{}).ProtoReflect().Type(), graveler.RepositoriesPartition(), []byte(graveler.RepoPath("")), kv.IteratorOptionsFrom([]byte(graveler.RepoPath(id))))
ri.closed = ri.err != nil
ri.value = nil
}
func (ri *RepositoryIterator) Value() *graveler.RepositoryRecord {
if ri.Err() != nil {
return nil
}
return ri.value
}
func (ri *RepositoryIterator) Err() error {
if ri.err != nil {
return ri.err
}
if !ri.closed {
return ri.it.Err()
}
return nil
}
func (ri *RepositoryIterator) Close() {
if ri.closed {
return
}
ri.it.Close()
ri.closed = true
}