forked from TrueCloudLab/frostfs-sdk-go
116 lines
2.5 KiB
Go
116 lines
2.5 KiB
Go
package transformer
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import (
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"crypto/ecdsa"
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"fmt"
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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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"github.com/TrueCloudLab/frostfs-sdk-go/session"
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"github.com/TrueCloudLab/frostfs-sdk-go/version"
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)
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type formatter struct {
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prm *FormatterParams
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obj *object.Object
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sz uint64
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}
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type EpochSource interface {
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CurrentEpoch() uint64
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}
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// FormatterParams groups NewFormatTarget parameters.
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type FormatterParams struct {
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Key *ecdsa.PrivateKey
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NextTarget ObjectTarget
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SessionToken *session.Object
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NetworkState EpochSource
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}
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// NewFormatTarget returns ObjectTarget instance that finalizes object structure
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// and writes it to the next target.
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//
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// Chunks must be written before the WriteHeader call.
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//
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// Object changes:
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// - sets version to current SDK version;
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// - sets payload size to the total length of all written chunks;
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// - sets session token;
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// - sets number of creation epoch;
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// - calculates and sets verification fields (ID, Signature).
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func NewFormatTarget(p *FormatterParams) ObjectTarget {
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return &formatter{
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prm: p,
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}
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}
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func (f *formatter) WriteHeader(obj *object.Object) error {
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f.obj = obj
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return nil
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}
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func (f *formatter) Write(p []byte) (n int, err error) {
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n, err = f.prm.NextTarget.Write(p)
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f.sz += uint64(n)
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return
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}
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func (f *formatter) Close() (*AccessIdentifiers, error) {
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curEpoch := f.prm.NetworkState.CurrentEpoch()
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ver := version.Current()
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f.obj.SetVersion(&ver)
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f.obj.SetPayloadSize(f.sz)
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f.obj.SetSessionToken(f.prm.SessionToken)
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f.obj.SetCreationEpoch(curEpoch)
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var (
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parID *oid.ID
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parHdr *object.Object
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)
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if par := f.obj.Parent(); par != nil && par.Signature() == nil {
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rawPar := object.NewFromV2(par.ToV2())
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rawPar.SetSessionToken(f.prm.SessionToken)
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rawPar.SetCreationEpoch(curEpoch)
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if err := object.SetIDWithSignature(*f.prm.Key, rawPar); err != nil {
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return nil, fmt.Errorf("could not finalize parent object: %w", err)
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}
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id, _ := rawPar.ID()
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parID = &id
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parHdr = rawPar
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f.obj.SetParent(parHdr)
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}
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if err := object.SetIDWithSignature(*f.prm.Key, f.obj); err != nil {
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return nil, fmt.Errorf("could not finalize object: %w", err)
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}
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if err := f.prm.NextTarget.WriteHeader(f.obj); err != nil {
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return nil, fmt.Errorf("could not write header to next target: %w", err)
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}
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if _, err := f.prm.NextTarget.Close(); err != nil {
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return nil, fmt.Errorf("could not close next target: %w", err)
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}
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id, _ := f.obj.ID()
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return new(AccessIdentifiers).
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WithSelfID(id).
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WithParentID(parID).
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WithParent(parHdr), nil
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}
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