consensus: drop NextConsensus from the prepareRequest

Follow neo-project/neo#744 to make our requests compatible with C# node.

pkg/consensus/consensus.go

@@ -464,15 +464,8 @@ func (s *service) getValidators(_ ...block.Transaction) []crypto.PublicKey {
 	return pubs
 }
 
-func (s *service) getConsensusAddress(validators ...crypto.PublicKey) (h util.Uint160) {
-	pubs := convertKeys(validators)
-
-	script, err := smartcontract.CreateMultiSigRedeemScript(s.dbft.M(), pubs)
-	if err != nil {
-		return
-	}
-
-	return crypto.Hash160(script)
+func (s *service) getConsensusAddress(validators ...crypto.PublicKey) util.Uint160 {
+	return util.Uint160{}
 }
 
 func convertKeys(validators []crypto.PublicKey) (pubs []*keys.PublicKey) {
@@ -493,7 +486,16 @@ func (s *service) newBlockFromContext(ctx *dbft.Context) block.Block {
 	block.Block.Network = s.network
 	block.Block.Timestamp = ctx.Timestamp / 1000000
 	block.Block.Index = ctx.BlockIndex
-	block.Block.NextConsensus = ctx.NextConsensus
+
+	validators, err := s.Chain.GetValidators()
+	if err != nil {
+		return nil
+	}
+	script, err := smartcontract.CreateMultiSigRedeemScript(len(validators)-(len(validators)-1)/3, validators)
+	if err != nil {
+		return nil
+	}
+	block.Block.NextConsensus = crypto.Hash160(script)
 	block.Block.PrevHash = ctx.PrevHash
 	block.Block.Version = ctx.Version
 	block.Block.ConsensusData.Nonce = ctx.Nonce

pkg/consensus/payload_test.go

@@ -256,7 +256,6 @@ func randomPrepareRequest(t *testing.T) *prepareRequest {
 	for i := 0; i < txCount; i++ {
 		req.transactionHashes[i] = random.Uint256()
 	}
-	req.nextConsensus = random.Uint160()
 
 	return req
 }

pkg/consensus/prepare_request.go

@@ -11,7 +11,6 @@ type prepareRequest struct {
 	timestamp         uint64
 	nonce             uint64
 	transactionHashes []util.Uint256
-	nextConsensus     util.Uint160
 }
 
 var _ payload.PrepareRequest = (*prepareRequest)(nil)
@@ -20,7 +19,6 @@ var _ payload.PrepareRequest = (*prepareRequest)(nil)
 func (p *prepareRequest) EncodeBinary(w *io.BinWriter) {
 	w.WriteU64LE(p.timestamp)
 	w.WriteU64LE(p.nonce)
-	w.WriteBytes(p.nextConsensus[:])
 	w.WriteArray(p.transactionHashes)
 }
 
@@ -28,7 +26,6 @@ func (p *prepareRequest) EncodeBinary(w *io.BinWriter) {
 func (p *prepareRequest) DecodeBinary(r *io.BinReader) {
 	p.timestamp = r.ReadU64LE()
 	p.nonce = r.ReadU64LE()
-	r.ReadBytes(p.nextConsensus[:])
 	r.ReadArray(&p.transactionHashes)
 }
 
@@ -51,7 +48,7 @@ func (p *prepareRequest) TransactionHashes() []util.Uint256 { return p.transacti
 func (p *prepareRequest) SetTransactionHashes(hs []util.Uint256) { p.transactionHashes = hs }
 
 // NextConsensus implements payload.PrepareRequest interface.
-func (p *prepareRequest) NextConsensus() util.Uint160 { return p.nextConsensus }
+func (p *prepareRequest) NextConsensus() util.Uint160 { return util.Uint160{} }
 
 // SetNextConsensus implements payload.PrepareRequest interface.
-func (p *prepareRequest) SetNextConsensus(nc util.Uint160) { p.nextConsensus = nc }
+func (p *prepareRequest) SetNextConsensus(_ util.Uint160) {}

pkg/consensus/prepare_request_test.go

@@ -20,7 +20,7 @@ func TestPrepareRequest_Setters(t *testing.T) {
 	require.EqualValues(t, 1000000, p.Timestamp())
 
 	p.SetNextConsensus(util.Uint160{5, 6, 7})
-	require.Equal(t, util.Uint160{5, 6, 7}, p.NextConsensus())
+	require.Equal(t, util.Uint160{}, p.NextConsensus())
 
 	p.SetNonce(8765)
 	require.EqualValues(t, 8765, p.Nonce())

pkg/consensus/recovery_message_test.go

@@ -31,7 +31,6 @@ func TestRecoveryMessage_Setters(t *testing.T) {
 		timestamp:         87,
 		nonce:             321,
 		transactionHashes: []util.Uint256{{1}},
-		nextConsensus:     util.Uint160{1, 2},
 	}
 	p1 := new(Payload)
 	p1.message = &message{}