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package chain
import (
"errors"
"fmt"
"io"
"lindenii.org/go/furgit/object/id"
"lindenii.org/go/furgit/object/store"
"lindenii.org/go/furgit/object/typ"
)
// ReadReaderFull reads a full serialized object stream
// from the first backend that has it.
func (chain *Chain) ReadReaderFull(id id.ObjectID) (io.ReadCloser, error) {
for _, backend := range chain.backends {
reader, err := backend.ReadReaderFull(id)
if err == nil {
return reader, nil
}
if errors.Is(err, store.ErrObjectNotFound) {
continue
}
return nil, fmt.Errorf("object/store/chain: read reader full: %w", err)
}
return nil, store.ErrObjectNotFound
}
// ReadReaderContent reads an object's type, declared content length,
// and content stream from the first backend that has it.
func (chain *Chain) ReadReaderContent(id id.ObjectID) (typ.Type, int, io.ReadCloser, error) {
for _, backend := range chain.backends {
ty, size, reader, err := backend.ReadReaderContent(id)
if err == nil {
return ty, size, reader, nil
}
if errors.Is(err, store.ErrObjectNotFound) {
continue
}
return typ.Unknown, 0, nil, fmt.Errorf("object/store/chain: read reader content: %w", err)
}
return typ.Unknown, 0, nil, store.ErrObjectNotFound
}
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