136 lines
2.8 KiB
Go
136 lines
2.8 KiB
Go
package shard
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import (
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"errors"
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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/blobstor"
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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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ln int64 // negative value for full range
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off uint64
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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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// WithFullRange is a Get option to receive full object payload.
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func (p *GetPrm) WithFullRange() *GetPrm {
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if p != nil {
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p.ln = -1
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}
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return p
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}
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// WithRange is a Get option to set range of requested payload data.
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//
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// Calling with negative length is equivalent
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// to getting the full payload range.
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//
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// Calling with zero length is equivalent
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// to getting the object header.
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func (p *GetPrm) WithRange(off uint64, ln int64) *GetPrm {
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if p != nil {
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p.off, p.ln = off, ln
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}
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return p
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}
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// Object returns the requested object part.
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//
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// Instance payload contains the requested range of the original 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 part of 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 ErrObjectNotFound if requested object is missing in shard.
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func (s *Shard) Get(prm *GetPrm) (*GetRes, error) {
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if prm.ln < 0 {
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// try to read from WriteCache
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// TODO: implement
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// form GetBig parameters
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getBigPrm := new(blobstor.GetBigPrm)
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getBigPrm.SetAddress(prm.addr)
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res, err := s.blobStor.GetBig(getBigPrm)
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if err != nil {
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if errors.Is(err, blobstor.ErrObjectNotFound) {
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err = ErrObjectNotFound
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}
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return nil, err
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}
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return &GetRes{
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obj: res.Object(),
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}, nil
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} else if prm.ln == 0 {
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head, err := s.metaBase.Get(prm.addr)
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if err != nil {
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return nil, err
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}
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return &GetRes{
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obj: head,
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}, nil
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}
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// try to read from WriteCache
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// TODO: implement
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// form GetRangeBig parameters
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getRngBigPrm := new(blobstor.GetRangeBigPrm)
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getRngBigPrm.SetAddress(prm.addr)
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rng := objectSDK.NewRange()
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rng.SetOffset(prm.off)
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rng.SetLength(uint64(prm.ln))
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getRngBigPrm.SetRange(rng)
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res, err := s.blobStor.GetRangeBig(getRngBigPrm)
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if err != nil {
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if errors.Is(err, blobstor.ErrObjectNotFound) {
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err = ErrObjectNotFound
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}
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return nil, err
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}
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obj := object.NewRaw()
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obj.SetPayload(res.RangeData())
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return &GetRes{
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obj: obj.Object(),
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}, nil
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}
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