forked from TrueCloudLab/frostfs-node
71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
package blobovnicza
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import (
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"fmt"
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"github.com/nspcc-dev/neofs-node/pkg/core/object"
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objectSDK "github.com/nspcc-dev/neofs-sdk-go/object"
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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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// SetRange 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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// GetRange reads range of 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, fmt.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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