Introduce consensus peer application [FAB-473]

This work is based on Simon Schubert's previous work
from his 'separate-consensus' branch.

Change-Id: Id774a7f30f4564115245bdbf3f975d179cd524a9
Signed-off-by: Gabor Hosszu <gabor@digitalasset.com>
Signed-off-by: Simon Schubert <sis@zurich.ibm.com>

orderer/sbft/backend/backend_test.go

@@ -0,0 +1,61 @@
+/*
+Copyright Digital Asset Holdings, LLC 2016 All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package backend
+
+import (
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	crand "crypto/rand"
+	"crypto/rsa"
+	"testing"
+)
+
+func TestSignAndVerifyRsa(t *testing.T) {
+	data := []byte{1, 1, 1, 1, 1}
+	privateKey, err := rsa.GenerateKey(crand.Reader, 1024)
+	if err != nil {
+		panic("RSA failed to generate private key in test.")
+	}
+	s := Sign(privateKey, data)
+	if s == nil {
+		t.Error("Nil signature was generated.")
+	}
+
+	publicKey := privateKey.Public()
+	err = CheckSig(publicKey, data, s)
+	if err != nil {
+		t.Errorf("Signature check failed: %s", err)
+	}
+}
+
+func TestSignAndVerifyEcdsa(t *testing.T) {
+	data := []byte{1, 1, 1, 1, 1}
+	privateKey, err := ecdsa.GenerateKey(elliptic.P256(), crand.Reader)
+	if err != nil {
+		panic("ECDSA failed to generate private key in test.")
+	}
+	s := Sign(privateKey, data)
+	if s == nil {
+		t.Error("Nil signature was generated.")
+	}
+
+	publicKey := privateKey.Public()
+	err = CheckSig(publicKey, data, s)
+	if err != nil {
+		t.Errorf("Signature check failed: %s", err)
+	}
+}

orderer/sbft/backend/backendab.go

@@ -0,0 +1,67 @@
+/*
+Copyright Digital Asset Holdings, LLC 2016 All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package backend
+
+import (
+	"github.com/golang/protobuf/proto"
+	ab "github.com/hyperledger/fabric/protos/orderer"
+	"github.com/hyperledger/fabric/orderer/solo"
+)
+
+type BackendAB struct {
+	backend       *Backend
+	deliverserver *solo.DeliverServer
+}
+
+func NewBackendAB(backend *Backend) *BackendAB {
+	bab := &BackendAB{
+		backend:       backend,
+		deliverserver: solo.NewDeliverServer(backend.ledger, 1000),
+	}
+	return bab
+}
+
+// Broadcast receives a stream of messages from a client for ordering
+func (b *BackendAB) Broadcast(srv ab.AtomicBroadcast_BroadcastServer) error {
+	for {
+		envelope, err := srv.Recv()
+		if err != nil {
+			return err
+		}
+
+		if envelope.Payload == nil {
+			err = srv.Send(&ab.BroadcastResponse{ab.Status_BAD_REQUEST})
+			if err != nil {
+				return err
+			}
+		}
+		req, err := proto.Marshal(envelope)
+		if err != nil {
+			return err
+		}
+		b.backend.enqueueRequest(req)
+		err = srv.Send(&ab.BroadcastResponse{ab.Status_SUCCESS})
+		if err != nil {
+			return err
+		}
+	}
+}
+
+// Deliver sends a stream of blocks to a client after ordering
+func (b *BackendAB) Deliver(srv ab.AtomicBroadcast_DeliverServer) error {
+	return b.deliverserver.HandleDeliver(srv)
+}

orderer/sbft/backend/consensus.proto

@@ -0,0 +1,12 @@
+syntax = "proto3";
+
+package backend;
+
+import "github.com/hyperledger/fabric/consensus/simplebft/simplebft.proto";
+
+service consensus {
+    rpc consensus(handshake) returns (stream simplebft.msg) {}
+}
+
+message handshake {
+}

orderer/sbft/backend/events.go

@@ -0,0 +1,66 @@
+/*
+Copyright Digital Asset Holdings, LLC 2016 All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package backend
+
+import (
+	s "github.com/hyperledger/fabric/consensus/simplebft"
+)
+
+type Timer struct {
+	tf      func()
+	execute bool
+}
+
+func (t *Timer) Cancel() {
+	t.execute = false
+}
+
+type Executable interface {
+	Execute(*Backend)
+}
+
+func (t *Timer) Execute(backend *Backend) {
+	if t.execute {
+		t.tf()
+	}
+}
+
+type msgEvent struct {
+	msg *s.Msg
+	src uint64
+}
+
+func (m *msgEvent) Execute(backend *Backend) {
+	backend.consensus.Receive(m.msg, m.src)
+}
+
+type requestEvent struct {
+	req []byte
+}
+
+func (r *requestEvent) Execute(backend *Backend) {
+	backend.consensus.Request(r.req)
+}
+
+type connectionEvent struct {
+	peerid uint64
+}
+
+func (c *connectionEvent) Execute(backend *Backend) {
+	backend.consensus.Connection(c.peerid)
+}
+