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package chain
import (
"errors"
"fmt"
"io"
"codeberg.org/lindenii/furgit/objectid"
"codeberg.org/lindenii/furgit/objectstore"
"codeberg.org/lindenii/furgit/objecttype"
)
// ReadReaderFull reads a full serialized object stream from the first backend that has it.
func (chain *Chain) ReadReaderFull(id objectid.ObjectID) (io.ReadCloser, error) {
for i, backend := range chain.backends {
if backend == nil {
continue
}
reader, err := backend.ReadReaderFull(id)
if err == nil {
return reader, nil
}
if errors.Is(err, objectstore.ErrObjectNotFound) {
continue
}
return nil, fmt.Errorf("objectstore: backend %d read reader full: %w", i, err)
}
return nil, objectstore.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 objectid.ObjectID) (objecttype.Type, int64, io.ReadCloser, error) {
for i, backend := range chain.backends {
if backend == nil {
continue
}
ty, size, reader, err := backend.ReadReaderContent(id)
if err == nil {
return ty, size, reader, nil
}
if errors.Is(err, objectstore.ErrObjectNotFound) {
continue
}
return objecttype.TypeInvalid, 0, nil, fmt.Errorf("objectstore: backend %d read reader content: %w", i, err)
}
return objecttype.TypeInvalid, 0, nil, objectstore.ErrObjectNotFound
}
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