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interceptedMetaBlockHeader.go
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/
interceptedMetaBlockHeader.go
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package interceptedBlocks
import (
"fmt"
"github.com/ElrondNetwork/elrond-go/data"
"github.com/ElrondNetwork/elrond-go/data/block"
"github.com/ElrondNetwork/elrond-go/data/typeConverters"
"github.com/ElrondNetwork/elrond-go/hashing"
"github.com/ElrondNetwork/elrond-go/marshal"
"github.com/ElrondNetwork/elrond-go/process"
"github.com/ElrondNetwork/elrond-go/sharding"
)
// InterceptedMetaHeader represents the wrapper over the meta block header struct
type InterceptedMetaHeader struct {
hdr *block.MetaBlock
sigVerifier process.InterceptedHeaderSigVerifier
hasher hashing.Hasher
shardCoordinator sharding.Coordinator
hash []byte
chainID []byte
validityAttester process.ValidityAttester
epochStartTrigger process.EpochStartTriggerHandler
nonceConverter typeConverters.Uint64ByteSliceConverter
}
// NewInterceptedMetaHeader creates a new instance of InterceptedMetaHeader struct
func NewInterceptedMetaHeader(arg *ArgInterceptedBlockHeader) (*InterceptedMetaHeader, error) {
err := checkBlockHeaderArgument(arg)
if err != nil {
return nil, err
}
hdr, err := createMetaHdr(arg.Marshalizer, arg.HdrBuff)
if err != nil {
return nil, err
}
inHdr := &InterceptedMetaHeader{
hdr: hdr,
hasher: arg.Hasher,
sigVerifier: arg.HeaderSigVerifier,
shardCoordinator: arg.ShardCoordinator,
chainID: arg.ChainID,
validityAttester: arg.ValidityAttester,
epochStartTrigger: arg.EpochStartTrigger,
nonceConverter: arg.NonceConverter,
}
inHdr.processFields(arg.HdrBuff)
return inHdr, nil
}
func createMetaHdr(marshalizer marshal.Marshalizer, hdrBuff []byte) (*block.MetaBlock, error) {
hdr := &block.MetaBlock{
ShardInfo: make([]block.ShardData, 0),
}
err := marshalizer.Unmarshal(hdr, hdrBuff)
if err != nil {
return nil, err
}
return hdr, nil
}
func (imh *InterceptedMetaHeader) processFields(txBuff []byte) {
imh.hash = imh.hasher.Compute(string(txBuff))
}
// Hash gets the hash of this header
func (imh *InterceptedMetaHeader) Hash() []byte {
return imh.hash
}
// HeaderHandler returns the MetaBlock pointer that holds the data
func (imh *InterceptedMetaHeader) HeaderHandler() data.HeaderHandler {
return imh.hdr
}
// CheckValidity checks if the received meta header is valid (not nil fields, valid sig and so on)
func (imh *InterceptedMetaHeader) CheckValidity() error {
err := imh.integrity()
if err != nil {
return err
}
err = imh.validityAttester.CheckBlockAgainstFinal(imh.HeaderHandler())
if err != nil {
return err
}
err = imh.validityAttester.CheckBlockAgainstRounder(imh.HeaderHandler())
if err != nil {
return err
}
err = imh.sigVerifier.VerifyRandSeedAndLeaderSignature(imh.hdr)
if err != nil {
return err
}
err = imh.sigVerifier.VerifySignature(imh.hdr)
if err != nil {
return err
}
return imh.hdr.CheckChainID(imh.chainID)
}
// integrity checks the integrity of the meta header block wrapper
func (imh *InterceptedMetaHeader) integrity() error {
err := checkHeaderHandler(imh.HeaderHandler())
if err != nil {
return err
}
err = checkMetaShardInfo(imh.hdr.ShardInfo, imh.shardCoordinator)
if err != nil {
return err
}
return nil
}
// IsForCurrentShard always returns true
func (imh *InterceptedMetaHeader) IsForCurrentShard() bool {
return true
}
// Type returns the type of this intercepted data
func (imh *InterceptedMetaHeader) Type() string {
return "intercepted meta header"
}
// String returns the meta header's most important fields as string
func (imh *InterceptedMetaHeader) String() string {
return fmt.Sprintf("epoch=%d, round=%d, nonce=%d",
imh.hdr.Epoch,
imh.hdr.Round,
imh.hdr.Nonce,
)
}
// Identifiers returns the identifiers used in requests
func (imh *InterceptedMetaHeader) Identifiers() [][]byte {
nonceBytes := imh.nonceConverter.ToByteSlice(imh.hdr.Nonce)
return [][]byte{imh.hash, nonceBytes}
}
// IsInterfaceNil returns true if there is no value under the interface
func (imh *InterceptedMetaHeader) IsInterfaceNil() bool {
return imh == nil
}