590745204c
All parameters and resulting values of all metabase operations are structured in new types. The most popular scenarios for using operations are moved to auxiliary functions. Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
128 lines
2.9 KiB
Go
128 lines
2.9 KiB
Go
package shard
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import (
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"fmt"
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objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
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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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)
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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) (*object.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 *objectSDK.Address
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}
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// GetRes groups resulting values of Get operation.
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type GetRes struct {
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obj *object.Object
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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 *objectSDK.Address) *GetPrm {
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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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// Object returns the requested object.
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func (r *GetRes) Object() *object.Object {
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return r.obj
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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 object.ErrNotFound if requested object is missing 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) (*object.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) (*object.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, err := s.fetchObjectData(prm.addr, big, small)
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return &GetRes{
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obj: obj,
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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 *objectSDK.Address, big, small storFetcher) (*object.Object, error) {
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var (
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err error
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res *object.Object
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)
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if s.hasWriteCache() {
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res, err = small(s.writeCache, nil)
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if err == nil {
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return res, nil
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}
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s.log.Debug("miss in writeCache blobovnicza")
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res, err = big(s.writeCache, nil)
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if err == nil {
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return res, nil
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}
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s.log.Debug("miss in writeCache shallow dir")
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}
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exists, err := meta.Exists(s.metaBase, addr)
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if err != nil {
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return nil, err
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}
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if !exists {
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return nil, object.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, 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, err
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}
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