frostfs-node/pkg/local_object_storage/shard/head.go

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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"
oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
)
// HeadPrm groups the parameters of Head operation.
type HeadPrm struct {
addr oid.Address
raw bool
}
// HeadRes groups the 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 oid.Address) {
if p != nil {
p.addr = addr
}
}
// 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) {
if p != nil {
p.raw = raw
}
}
// 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 an error of type apistatus.ObjectNotFound if object is missing in Shard.
// Returns an error of type apistatus.ObjectAlreadyRemoved if the 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
}
var headParams meta.GetPrm
headParams.WithAddress(prm.addr)
headParams.WithRaw(prm.raw)
res, err := s.metaBase.Get(headParams)
if err != nil {
return nil, err
}
return &HeadRes{
obj: res.Header(),
}, nil
}