/
wired_getsheet.go
72 lines (57 loc) · 1.86 KB
/
wired_getsheet.go
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package wired
import (
"github.com/c0mm4nd/rlp"
"github.com/google/uuid"
"github.com/libp2p/go-libp2p/core/network"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/ngchain/ngcore/ngstate"
"github.com/pkg/errors"
)
func (w *Wired) SendGetSheet(peerID peer.ID, checkpointHeight uint64, checkpointHash []byte) (id []byte, stream network.Stream, err error) {
payload, err := rlp.EncodeToBytes(&GetSheetPayload{
Height: checkpointHeight,
Hash: checkpointHash,
})
if err != nil {
err = errors.Wrapf(err, "failed to encode data into rlp")
log.Debug(err)
return nil, nil, err
}
id, _ = uuid.New().MarshalBinary()
// create message data
req := &Message{
Header: NewHeader(w.host, w.network, id, GetChainMsg),
Payload: payload,
}
// sign the data
signature, err := Signature(w.host, req)
if err != nil {
err = errors.Wrap(err, "failed to sign pb data")
log.Debug(err)
return nil, nil, err
}
// add the signature to the message
req.Header.Sign = signature
stream, err = Send(w.host, w.protocolID, peerID, req)
if err != nil {
log.Debug(err)
return nil, nil, err
}
log.Debugf("getsheet to: %s was sent. Message Id: %x, request sheet @%d: %x", peerID, req.Header.ID, checkpointHeight, checkpointHash)
return req.Header.ID, stream, nil
}
func (w *Wired) onGetSheet(stream network.Stream, msg *Message) {
log.Debugf("Received getsheet request from %s.", stream.Conn().RemotePeer())
var getSheetPayload GetSheetPayload
err := rlp.DecodeBytes(msg.Payload, &getSheetPayload)
if err != nil {
w.sendReject(msg.Header.ID, stream, err)
return
}
log.Debugf("getsheet requests sheet@%d: %x", getSheetPayload.Height, getSheetPayload.Hash)
sheet := w.chain.GetSnapshot(getSheetPayload.Height, getSheetPayload.Hash)
if sheet == nil {
w.sendReject(msg.Header.ID, stream, ngstate.ErrSnapshotNofFound)
}
w.sendSheet(msg.Header.ID, stream, sheet)
}