89 lines
2.3 KiB
Go
89 lines
2.3 KiB
Go
package shard
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import (
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"fmt"
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meta "github.com/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
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objectSDK "github.com/TrueCloudLab/frostfs-sdk-go/object"
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oid "github.com/TrueCloudLab/frostfs-sdk-go/object/id"
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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 oid.Address
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raw bool
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}
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// HeadRes groups the resulting values of Head operation.
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type HeadRes struct {
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obj *objectSDK.Object
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}
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// SetAddress 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) SetAddress(addr oid.Address) {
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p.addr = addr
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}
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// SetRaw 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) SetRaw(raw bool) {
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p.raw = raw
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}
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// Object returns the requested object header.
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func (r HeadRes) Object() *objectSDK.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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//
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// Returns an error of type apistatus.ObjectNotFound if object is missing in Shard.
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// Returns an error of type apistatus.ObjectAlreadyRemoved if the requested object has been marked as removed in shard.
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// Returns the object.ErrObjectIsExpired if the object is presented but already expired.
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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 !IsErrNotFound(err) {
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// in this case we think that object is presented in write-cache, but corrupted
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return HeadRes{}, 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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var obj *objectSDK.Object
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var err error
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if s.GetMode().NoMetabase() {
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var getPrm GetPrm
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getPrm.SetAddress(prm.addr)
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getPrm.SetIgnoreMeta(true)
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var res GetRes
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res, err = s.Get(getPrm)
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obj = res.Object()
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} else {
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var headParams meta.GetPrm
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headParams.SetAddress(prm.addr)
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headParams.SetRaw(prm.raw)
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var res meta.GetRes
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res, err = s.metaBase.Get(headParams)
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obj = res.Header()
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}
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return HeadRes{
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obj: obj,
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}, err
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}
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