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