package shard import ( "fmt" meta "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/metabase" "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/writecache" objectSDK "github.com/nspcc-dev/neofs-sdk-go/object" addressSDK "github.com/nspcc-dev/neofs-sdk-go/object/address" ) // HeadPrm groups the parameters of Head operation. type HeadPrm struct { addr *addressSDK.Address raw bool } // HeadRes groups resulting values of Head operation. type HeadRes struct { obj *objectSDK.Object } // WithAddress is a Head option to set the address of the requested object. // // Option is required. func (p *HeadPrm) WithAddress(addr *addressSDK.Address) *HeadPrm { if p != nil { p.addr = addr } return p } // WithRaw is a Head option to set raw flag value. If flag is unset, then Head // returns header of virtual object, otherwise it returns SplitInfo of virtual // object. func (p *HeadPrm) WithRaw(raw bool) *HeadPrm { if p != nil { p.raw = raw } return p } // Object returns the requested object header. func (r *HeadRes) Object() *objectSDK.Object { return r.obj } // Head reads header of the object from the shard. // // Returns any error encountered. // // Returns apistatus.ObjectNotFound if object is missing in Shard. // Returns apistatus.ObjectAlreadyRemoved if requested object has been marked as removed in shard. func (s *Shard) Head(prm *HeadPrm) (*HeadRes, error) { // object can be saved in write-cache (if enabled) or in metabase if s.hasWriteCache() { // try to read header from write-cache header, err := s.writeCache.Head(prm.addr) if err == nil { return &HeadRes{ obj: header, }, nil } else if !writecache.IsErrNotFound(err) { // in this case we think that object is presented in write-cache, but corrupted return nil, fmt.Errorf("could not read header from write-cache: %w", err) } // otherwise object seems to be flushed to metabase } headParams := new(meta.GetPrm). WithAddress(prm.addr). WithRaw(prm.raw) res, err := s.metaBase.Get(headParams) if err != nil { return nil, err } return &HeadRes{ obj: res.Header(), }, nil }