forked from TrueCloudLab/frostfs-node
137 lines
2.9 KiB
Go
137 lines
2.9 KiB
Go
package engine
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import (
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"errors"
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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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"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/util"
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objectSDK "github.com/nspcc-dev/neofs-sdk-go/object"
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"go.uber.org/zap"
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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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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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// 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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// Object returns the requested 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 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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//
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// Returns an error if executions are blocked (see BlockExecution).
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func (e *StorageEngine) Get(prm *GetPrm) (res *GetRes, err error) {
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err = e.execIfNotBlocked(func() error {
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res, err = e.get(prm)
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return err
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})
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return
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}
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func (e *StorageEngine) get(prm *GetPrm) (*GetRes, error) {
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if e.metrics != nil {
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defer elapsed(e.metrics.AddGetDuration)()
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}
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var (
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obj *object.Object
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siErr *objectSDK.SplitInfoError
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outSI *objectSDK.SplitInfo
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outError = object.ErrNotFound
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)
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shPrm := new(shard.GetPrm).
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WithAddress(prm.addr)
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e.iterateOverSortedShards(prm.addr, func(_ int, sh *shard.Shard) (stop bool) {
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res, err := sh.Get(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.As(err, &siErr):
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siErr = err.(*objectSDK.SplitInfoError)
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if outSI == nil {
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outSI = objectSDK.NewSplitInfo()
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}
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util.MergeSplitInfo(siErr.SplitInfo(), outSI)
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// stop iterating over shards if SplitInfo structure is complete
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if outSI.Link() != nil && outSI.LastPart() != nil {
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return true
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}
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return false
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case errors.Is(err, object.ErrAlreadyRemoved):
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outError = err
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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 outSI != nil {
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return nil, objectSDK.NewSplitInfoError(outSI)
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}
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if obj == nil {
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return nil, outError
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}
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return &GetRes{
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obj: obj,
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}, nil
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}
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// Get reads object from local storage by provided address.
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func Get(storage *StorageEngine, addr *objectSDK.Address) (*object.Object, error) {
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res, err := storage.Get(new(GetPrm).
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WithAddress(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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return res.Object(), nil
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}
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