frostfs-node/pkg/local_object_storage/blobstor/iterate.go

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package blobstor
import (
"fmt"
objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
"github.com/nspcc-dev/neofs-node/pkg/core/object"
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobovnicza"
)
// IterationElement represents a unit of elements through which Iterate operation passes.
type IterationElement struct {
data []byte
blzID *blobovnicza.ID
}
// ObjectData returns stored object in a binary representation.
func (x IterationElement) ObjectData() []byte {
return x.data
}
// BlobovniczaID returns identifier of Blobovnicza in which object is stored.
// Returns nil if object isn't in Blobovnicza.
func (x IterationElement) BlobovniczaID() *blobovnicza.ID {
return x.blzID
}
// IterationHandler is a generic processor of IterationElement.
type IterationHandler func(IterationElement) error
// IteratePrm groups the parameters of Iterate operation.
type IteratePrm struct {
handler IterationHandler
}
// IterateRes groups resulting values of Iterate operation.
type IterateRes struct{}
// SetIterationHandler sets the action to be performed on each iteration.
func (i *IteratePrm) SetIterationHandler(h IterationHandler) {
i.handler = h
}
// Iterate traverses the storage over the stored objects and calls the handler
// on each element.
//
// Returns any error encountered that
// did not allow to completely iterate over the storage.
//
// If handler returns an error, method wraps and returns it immediately.
func (b *BlobStor) Iterate(prm IteratePrm) (*IterateRes, error) {
var elem IterationElement
err := b.blobovniczas.iterateBlobovniczas(func(p string, blz *blobovnicza.Blobovnicza) error {
err := blobovnicza.IterateObjects(blz, func(data []byte) error {
var err error
// decompress the data
elem.data, err = b.decompressor(data)
if err != nil {
return fmt.Errorf("could not decompress object data: %w", err)
}
elem.blzID = blobovnicza.NewIDFromBytes([]byte(p))
return prm.handler(elem)
})
if err != nil {
return fmt.Errorf("blobovnicza iterator failure %s: %w", p, err)
}
return nil
})
if err != nil {
return nil, fmt.Errorf("blobovniczas iterator failure: %w", err)
}
elem.blzID = nil
err = b.fsTree.Iterate(func(_ *objectSDK.Address, data []byte) error {
// decompress the data
elem.data, err = b.decompressor(data)
if err != nil {
return fmt.Errorf("could not decompress object data: %w", err)
}
return prm.handler(elem)
})
if err != nil {
return nil, fmt.Errorf("fs tree iterator failure: %w", err)
}
return new(IterateRes), nil
}
// IterateBinaryObjects is a helper function which iterates over BlobStor and passes binary objects to f.
func IterateBinaryObjects(blz *BlobStor, f func(data []byte, blzID *blobovnicza.ID) error) error {
var prm IteratePrm
prm.SetIterationHandler(func(elem IterationElement) error {
return f(elem.ObjectData(), elem.BlobovniczaID())
})
_, err := blz.Iterate(prm)
return err
}
// IterateObjects is a helper function which iterates over BlobStor and passes decoded objects to f.
func IterateObjects(blz *BlobStor, f func(obj *object.Object, blzID *blobovnicza.ID) error) error {
var obj *object.Object
return IterateBinaryObjects(blz, func(data []byte, blzID *blobovnicza.ID) error {
if obj == nil {
obj = object.New()
}
if err := obj.Unmarshal(data); err != nil {
return fmt.Errorf("could not unmarshal the object: %w", err)
}
return f(obj, blzID)
})
}