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package chain
import (
"errors"
"fmt"
"lindenii.org/go/furgit/object/id"
"lindenii.org/go/furgit/object/store"
"lindenii.org/go/furgit/object/typ"
)
// ReadHeader reads object header data
// from the first backend that has it.
func (chain *Chain) ReadHeader(id id.ObjectID) (typ.Type, int, error) {
for _, backend := range chain.backends {
ty, size, err := backend.ReadHeader(id)
if err == nil {
return ty, size, nil
}
if errors.Is(err, store.ErrObjectNotFound) {
continue
}
return typ.Unknown, 0, fmt.Errorf("object/store/chain: read header: %w", err)
}
return typ.Unknown, 0, store.ErrObjectNotFound
}
// ReadSize reads object content length
// from the first backend that has it.
func (chain *Chain) ReadSize(id id.ObjectID) (int, error) {
for _, backend := range chain.backends {
size, err := backend.ReadSize(id)
if err == nil {
return size, nil
}
if errors.Is(err, store.ErrObjectNotFound) {
continue
}
return 0, fmt.Errorf("object/store/chain: read size: %w", err)
}
return 0, store.ErrObjectNotFound
}
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