70 lines
1.5 KiB
Go
70 lines
1.5 KiB
Go
package erasurecode
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import (
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"crypto/ecdsa"
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objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
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)
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// Split splits fully formed object into multiple chunks.
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func (c *Constructor) Split(obj *objectSDK.Object, key *ecdsa.PrivateKey) ([]*objectSDK.Object, error) {
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c.clear()
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header, err := obj.CutPayload().Marshal()
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if err != nil {
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return nil, err
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}
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headerShards, err := c.encodeRaw(header)
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if err != nil {
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return nil, err
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}
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payloadShards, err := c.encodeRaw(obj.Payload())
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if err != nil {
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return nil, err
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}
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parts := make([]*objectSDK.Object, len(payloadShards))
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parent, _ := obj.ID()
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for i := range parts {
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chunk := objectSDK.New()
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copyRequiredFields(chunk, obj)
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chunk.SetPayload(payloadShards[i])
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chunk.SetPayloadSize(uint64(len(payloadShards[i])))
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ec := objectSDK.NewECHeader(parent, uint32(i), uint32(len(payloadShards)), headerShards[i], uint32(len(header)))
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chunk.SetECHeader(ec)
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if err := setIDWithSignature(chunk, key); err != nil {
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return nil, err
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}
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parts[i] = chunk
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}
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return parts, nil
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}
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func setIDWithSignature(obj *objectSDK.Object, key *ecdsa.PrivateKey) error {
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objectSDK.CalculateAndSetPayloadChecksum(obj)
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if err := objectSDK.CalculateAndSetID(obj); err != nil {
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return err
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}
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if key == nil {
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return nil
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}
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return objectSDK.CalculateAndSetSignature(*key, obj)
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}
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func (c *Constructor) encodeRaw(data []byte) ([][]byte, error) {
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shards, err := c.enc.Split(data)
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if err != nil {
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return nil, err
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}
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if err := c.enc.Encode(shards); err != nil {
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return nil, err
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}
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return shards, nil
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}
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