84 lines
1.8 KiB
Go
84 lines
1.8 KiB
Go
package blobstor
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import (
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"io/ioutil"
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"os"
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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/pkg/errors"
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)
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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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// ErrObjectNotFound is returns on read operations requested on a missing object.
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var ErrObjectNotFound = errors.New("object not found")
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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 the object from BLOB storage.
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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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func (b *BlobStor) Get(prm *GetPrm) (*GetRes, error) {
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b.mtx.RLock()
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defer b.mtx.RUnlock()
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// get compressed object data
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data, err := b.fsTree.get(prm.addr)
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if err != nil {
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if errors.Is(err, errFileNotFound) {
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return nil, ErrObjectNotFound
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}
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return nil, errors.Wrap(err, "could not read object from fs tree")
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}
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data, err = b.decompressor(data)
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if err != nil {
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return nil, errors.Wrap(err, "could not decompress object data")
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}
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// unmarshal the object
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obj := object.New()
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if err := obj.Unmarshal(data); err != nil {
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return nil, errors.Wrap(err, "could not unmarshal the object")
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}
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return &GetRes{
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obj: obj,
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}, nil
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}
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func (t *fsTree) get(addr *objectSDK.Address) ([]byte, error) {
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p := t.treePath(addr)
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if _, err := os.Stat(p); os.IsNotExist(err) {
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return nil, errFileNotFound
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}
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return ioutil.ReadFile(p)
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}
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