157 lines
4 KiB
Go
157 lines
4 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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"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobovnicza"
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"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor"
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meta "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/metabase"
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"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/writecache"
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apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
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objectSDK "github.com/nspcc-dev/neofs-sdk-go/object"
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oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
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"go.uber.org/zap"
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)
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// storFetcher is a type to unify object fetching mechanism in `fetchObjectData`
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// method. It represents generalization of `getSmall` and `getBig` methods.
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type storFetcher = func(stor *blobstor.BlobStor, id *blobovnicza.ID) (*objectSDK.Object, error)
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// GetPrm groups the parameters of Get operation.
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type GetPrm struct {
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addr oid.Address
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skipMeta bool
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}
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// GetRes groups the resulting values of Get operation.
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type GetRes struct {
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obj *objectSDK.Object
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hasMeta bool
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}
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// WithAddress is a Get 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 *GetPrm) WithAddress(addr oid.Address) {
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if p != nil {
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p.addr = addr
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}
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}
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// WithIgnoreMeta is a Get option try to fetch object from blobstor directly,
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// without accessing metabase.
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func (p *GetPrm) WithIgnoreMeta(ignore bool) {
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p.skipMeta = ignore
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}
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// Object returns the requested object.
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func (r *GetRes) Object() *objectSDK.Object {
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return r.obj
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}
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// HasMeta returns true if info about the object was found in the metabase.
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func (r *GetRes) HasMeta() bool {
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return r.hasMeta
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}
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// Get reads an object from shard.
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//
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// Returns any error encountered that
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// did not allow to completely read the object part.
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//
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// Returns an error of type apistatus.ObjectNotFound if the requested 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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func (s *Shard) Get(prm GetPrm) (*GetRes, error) {
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var big, small storFetcher
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big = func(stor *blobstor.BlobStor, _ *blobovnicza.ID) (*objectSDK.Object, error) {
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getBigPrm := new(blobstor.GetBigPrm)
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getBigPrm.SetAddress(prm.addr)
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res, err := stor.GetBig(getBigPrm)
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if err != nil {
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return nil, err
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}
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return res.Object(), nil
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}
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small = func(stor *blobstor.BlobStor, id *blobovnicza.ID) (*objectSDK.Object, error) {
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getSmallPrm := new(blobstor.GetSmallPrm)
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getSmallPrm.SetAddress(prm.addr)
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getSmallPrm.SetBlobovniczaID(id)
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res, err := stor.GetSmall(getSmallPrm)
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if err != nil {
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return nil, err
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}
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return res.Object(), nil
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}
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obj, hasMeta, err := s.fetchObjectData(prm.addr, prm.skipMeta, big, small)
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return &GetRes{
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obj: obj,
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hasMeta: hasMeta,
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}, err
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}
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// fetchObjectData looks through writeCache and blobStor to find object.
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func (s *Shard) fetchObjectData(addr oid.Address, skipMeta bool, big, small storFetcher) (*objectSDK.Object, bool, error) {
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var (
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err error
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res *objectSDK.Object
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)
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if s.hasWriteCache() {
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res, err = s.writeCache.Get(addr)
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if err == nil {
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return res, false, nil
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}
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if writecache.IsErrNotFound(err) {
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s.log.Debug("object is missing in write-cache")
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} else {
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s.log.Error("failed to fetch object from write-cache", zap.Error(err))
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}
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}
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var exists bool
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if !skipMeta {
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exists, err = meta.Exists(s.metaBase, addr)
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if err != nil && s.GetMode() != ModeDegraded {
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return res, false, err
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}
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}
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if skipMeta || err != nil {
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res, err = small(s.blobStor, nil)
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if err == nil || errors.Is(err, object.ErrRangeOutOfBounds) {
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return res, false, err
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}
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res, err = big(s.blobStor, nil)
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return res, false, err
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}
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if !exists {
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var errNotFound apistatus.ObjectNotFound
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return nil, false, errNotFound
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}
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blobovniczaID, err := meta.IsSmall(s.metaBase, addr)
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if err != nil {
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return nil, true, fmt.Errorf("can't fetch blobovnicza id from metabase: %w", err)
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}
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if blobovniczaID != nil {
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res, err = small(s.blobStor, blobovniczaID)
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} else {
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res, err = big(s.blobStor, nil)
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}
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return res, true, err
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}
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