113 lines
3.1 KiB
Go
113 lines
3.1 KiB
Go
package shard
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import (
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"github.com/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor"
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"github.com/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
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"github.com/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
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"github.com/TrueCloudLab/frostfs-node/pkg/local_object_storage/writecache"
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apistatus "github.com/TrueCloudLab/frostfs-sdk-go/client/status"
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"github.com/TrueCloudLab/frostfs-sdk-go/object"
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oid "github.com/TrueCloudLab/frostfs-sdk-go/object/id"
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)
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// RngPrm groups the parameters of GetRange operation.
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type RngPrm struct {
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ln uint64
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off uint64
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addr oid.Address
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skipMeta bool
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}
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// RngRes groups the resulting values of GetRange operation.
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type RngRes struct {
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obj *object.Object
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hasMeta bool
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}
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// SetAddress is a Rng 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 *RngPrm) SetAddress(addr oid.Address) {
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p.addr = addr
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}
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// SetRange is a GetRange option to set range of requested payload data.
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func (p *RngPrm) SetRange(off uint64, ln uint64) {
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p.off, p.ln = off, ln
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}
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// SetIgnoreMeta is a Get option try to fetch object from blobstor directly,
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// without accessing metabase.
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func (p *RngPrm) SetIgnoreMeta(ignore bool) {
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p.skipMeta = ignore
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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 RngRes) Object() *object.Object {
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return r.obj
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}
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// HasMeta returns true if info about the object was found in the metabase.
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func (r RngRes) HasMeta() bool {
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return r.hasMeta
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}
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// GetRange 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 ErrRangeOutOfBounds if the requested object range is out of bounds.
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// Returns an error of type apistatus.ObjectNotFound if the requested object is missing.
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// Returns an error of type apistatus.ObjectAlreadyRemoved if the requested object has been marked as removed in shard.
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// Returns the object.ErrObjectIsExpired if the object is presented but already expired.
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func (s *Shard) GetRange(prm RngPrm) (RngRes, error) {
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cb := func(stor *blobstor.BlobStor, id []byte) (*object.Object, error) {
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var getRngPrm common.GetRangePrm
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getRngPrm.Address = prm.addr
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getRngPrm.Range.SetOffset(prm.off)
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getRngPrm.Range.SetLength(prm.ln)
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getRngPrm.StorageID = id
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res, err := stor.GetRange(getRngPrm)
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if err != nil {
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return nil, err
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}
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obj := object.New()
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obj.SetPayload(res.Data)
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return obj, nil
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}
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wc := func(c writecache.Cache) (*object.Object, error) {
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res, err := c.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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payload := res.Payload()
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from := prm.off
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to := from + prm.ln
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if pLen := uint64(len(payload)); to < from || pLen < from || pLen < to {
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return nil, logicerr.Wrap(apistatus.ObjectOutOfRange{})
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}
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obj := object.New()
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obj.SetPayload(payload[from:to])
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return obj, nil
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}
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skipMeta := prm.skipMeta || s.GetMode().NoMetabase()
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obj, hasMeta, err := s.fetchObjectData(prm.addr, skipMeta, cb, wc)
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return RngRes{
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obj: obj,
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hasMeta: hasMeta,
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}, err
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}
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