eaae5a5dd7
In previous implementation Blobovnicza's stored objects in protocol format which did not allow working with externally compressed objects. To achieve this goal, operations Get and Put no longer work with the structure of the object, but only with abstract binary data. Operation GetRange has become incorrect in its original purpose to receive the payload range. In this regard, BlobStor receives the payload range of the object through Get operation. In the future either Blobovnicza will learn to compress objects by itself, or the GetRange operation will be eliminated. Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
package blobovnicza
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import (
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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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// GetRangePrm groups the parameters of GetRange operation.
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type GetRangePrm struct {
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addr *objectSDK.Address
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rng *objectSDK.Range
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}
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// GetRangeRes groups resulting values of GetRange operation.
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type GetRangeRes struct {
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rngData []byte
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}
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// SetAddress sets address of the requested object.
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func (p *GetRangePrm) SetAddress(addr *objectSDK.Address) {
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p.addr = addr
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}
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// SetAddress sets range of the requested payload data .
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func (p *GetRangePrm) SetRange(rng *objectSDK.Range) {
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p.rng = rng
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}
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// RangeData returns the requested payload data range.
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func (p *GetRangeRes) RangeData() []byte {
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return p.rngData
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}
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// Get reads the object from Blobovnicza by address.
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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.
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//
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// Returns ErrNotFound if requested object is not
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// presented in Blobovnicza. Returns ErrRangeOutOfBounds
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// if requested range is outside the payload.
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func (b *Blobovnicza) GetRange(prm *GetRangePrm) (*GetRangeRes, error) {
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res, err := b.Get(&GetPrm{
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addr: prm.addr,
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})
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if err != nil {
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return nil, err
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}
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// FIXME: code below is incorrect because Get returns raw object data
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// so we should unmarshal payload from it before. If blobovnicza
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// stores objects in non-protocol format (e.g. compressed)
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// then it should not provide GetRange method.
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from := prm.rng.GetOffset()
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to := from + prm.rng.GetLength()
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payload := res.obj
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if from > to {
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return nil, errors.Errorf("invalid range [%d:%d]", from, to)
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} else if uint64(len(payload)) < to {
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return nil, object.ErrRangeOutOfBounds
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}
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return &GetRangeRes{
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rngData: payload[from:to],
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}, nil
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}
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