122 lines
2.7 KiB
Go
122 lines
2.7 KiB
Go
package engine
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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/shard"
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"go.uber.org/zap"
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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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off, ln uint64
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addr *objectSDK.Address
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}
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// GetRes groups resulting values of GetRange operation.
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type RngRes struct {
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obj *object.Object
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}
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// WithAddress is a GetRng 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) WithAddress(addr *objectSDK.Address) *RngPrm {
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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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// WithPayloadRange is a GetRange option to set range of requested payload data.
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//
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// Missing an option or calling with zero length is equivalent
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// to getting the full payload range.
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func (p *RngPrm) WithPayloadRange(off, ln uint64) *RngPrm {
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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 *RngRes) Object() *object.Object {
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return r.obj
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}
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// GetRange reads part of an object from local 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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//
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// Returns ErrNotFound if requested object is missing in local storage.
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func (e *StorageEngine) GetRange(prm *RngPrm) (*RngRes, error) {
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var (
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obj *object.Object
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alreadyRemoved = false
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)
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shPrm := new(shard.RngPrm).
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WithAddress(prm.addr).
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WithRange(prm.off, prm.ln)
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e.iterateOverSortedShards(prm.addr, func(_ int, sh *shard.Shard) (stop bool) {
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res, err := sh.GetRange(shPrm)
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if err != nil {
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switch {
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case errors.Is(err, object.ErrNotFound):
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return false // ignore, go to next shard
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case errors.Is(err, object.ErrAlreadyRemoved):
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alreadyRemoved = true
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return true // stop, return it back
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default:
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// TODO: smth wrong with shard, need to be processed, but
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// still go to next shard
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e.log.Warn("could not get object from shard",
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zap.Stringer("shard", sh.ID()),
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zap.String("error", err.Error()),
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)
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return false
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}
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}
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obj = res.Object()
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return true
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})
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if obj == nil {
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if alreadyRemoved {
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return nil, object.ErrAlreadyRemoved
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}
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return nil, object.ErrNotFound
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}
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return &RngRes{
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obj: obj,
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}, nil
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}
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// GetRange reads object payload range from local storage by provided address.
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func GetRange(storage *StorageEngine, addr *objectSDK.Address, rng *objectSDK.Range) ([]byte, error) {
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res, err := storage.GetRange(new(RngPrm).
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WithAddress(addr).
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WithPayloadRange(rng.GetOffset(), rng.GetLength()),
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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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return res.Object().Payload(), nil
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}
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