Gossip integration auxilary

This commits provides code that assists integration
of the gossip component to the peer by providing
naive method implementations of needed methods

Change-Id: Ic44d02b236912b83282530121f7d5448f68461c5
Signed-off-by: Yacov Manevich <yacovm@il.ibm.com>

gossip/integration/integration.go

@@ -0,0 +1,126 @@
+/*
+Copyright IBM Corp. 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 integration
+
+import (
+	"bytes"
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/hyperledger/fabric/gossip/comm"
+	"github.com/hyperledger/fabric/gossip/gossip"
+	"github.com/hyperledger/fabric/gossip/proto"
+	"google.golang.org/grpc"
+)
+
+// This file is used to bootstrap a gossip instance for integration/demo purposes ONLY
+
+func newConfig(selfEndpoint string, bootPeers ...string) *gossip.Config {
+	port, err := strconv.ParseInt(strings.Split(selfEndpoint, ":")[1], 10, 64)
+	if err != nil {
+		panic(err)
+	}
+	return &gossip.Config{
+		BindPort:       int(port),
+		BootstrapPeers: bootPeers,
+		ID:             selfEndpoint,
+		MaxMessageCountToStore:     100,
+		MaxPropagationBurstLatency: time.Millisecond * 50,
+		MaxPropagationBurstSize:    3,
+		PropagateIterations:        1,
+		PropagatePeerNum:           3,
+		PullInterval:               time.Second * 5,
+		PullPeerNum:                3,
+		SelfEndpoint:               selfEndpoint,
+	}
+}
+
+func newComm(selfEndpoint string, s *grpc.Server, dialOpts ...grpc.DialOption) comm.Comm {
+	comm, err := comm.NewCommInstance(s, NewGossipCryptoService(), []byte(selfEndpoint), dialOpts...)
+	if err != nil {
+		panic(err)
+	}
+	return comm
+}
+
+// NewGossipComponent creates a gossip component that attaches itself to the given gRPC server
+func NewGossipComponent(endpoint string, s *grpc.Server, bootPeers ...string) (gossip.Gossip, comm.Comm) {
+	conf := newConfig(endpoint, bootPeers...)
+	comm := newComm(endpoint, s, grpc.WithInsecure())
+	return gossip.NewGossipService(conf, comm, NewGossipCryptoService()), comm
+}
+
+// GossipCryptoService is an interface that conforms to both
+// the comm.SecurityProvider and to discovery.CryptoService
+type GossipCryptoService interface {
+
+	// isEnabled returns whether authentication is enabled
+	IsEnabled() bool
+
+	// Sign signs msg with this peers signing key and outputs
+	// the signature if no error occurred.
+	Sign(msg []byte) ([]byte, error)
+
+	// Verify checks that signature if a valid signature of message under vkID's verification key.
+	// If the verification succeeded, Verify returns nil meaning no error occurred.
+	// If vkID is nil, then the signature is verified against this validator's verification key.
+	Verify(vkID, signature, message []byte) error
+
+	// validateAliveMsg validates that an Alive message is authentic
+	ValidateAliveMsg(*proto.AliveMessage) bool
+
+	// SignMessage signs an AliveMessage and updates its signature field
+	SignMessage(*proto.AliveMessage) *proto.AliveMessage
+}
+
+// NewGossipCryptoService returns an instance that implements naively every security
+// interface that the gossip layer needs
+func NewGossipCryptoService() GossipCryptoService {
+	return &naiveCryptoServiceImpl{}
+}
+
+type naiveCryptoServiceImpl struct {
+}
+
+func (cs *naiveCryptoServiceImpl) ValidateAliveMsg(*proto.AliveMessage) bool {
+	return true
+}
+
+// SignMessage signs an AliveMessage and updates its signature field
+func (cs *naiveCryptoServiceImpl) SignMessage(msg *proto.AliveMessage) *proto.AliveMessage {
+	return msg
+}
+
+// IsEnabled returns true whether authentication is enabled
+func (cs *naiveCryptoServiceImpl) IsEnabled() bool {
+	return false
+}
+
+// Sign signs a message with the local peer's private key
+func (cs *naiveCryptoServiceImpl) Sign(msg []byte) ([]byte, error) {
+	return msg, nil
+}
+
+// Verify verifies a signature on a message that came from a peer with a certain vkID
+func (cs *naiveCryptoServiceImpl) Verify(vkID, signature, message []byte) error {
+	if !bytes.Equal(signature, message) {
+		return fmt.Errorf("Invalid signature!")
+	}
+	return nil
+}

gossip/integration/integration_test.go

@@ -0,0 +1,54 @@
+/*
+Copyright IBM Corp. 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 integration
+
+import (
+	"fmt"
+	"net"
+	"testing"
+	"time"
+
+	"google.golang.org/grpc"
+)
+
+// This is just a test that shows how to instantiate a gossip component
+func TestNewGossipCryptoService(t *testing.T) {
+	s1 := grpc.NewServer()
+	s2 := grpc.NewServer()
+	s3 := grpc.NewServer()
+
+	ll1, _ := net.Listen("tcp", fmt.Sprintf("%s:%d", "", 5611))
+	ll2, _ := net.Listen("tcp", fmt.Sprintf("%s:%d", "", 5612))
+	ll3, _ := net.Listen("tcp", fmt.Sprintf("%s:%d", "", 5613))
+
+	endpoint1 := "localhost:5611"
+	endpoint2 := "localhost:5612"
+	endpoint3 := "localhost:5613"
+
+	g1, _ := NewGossipComponent(endpoint1, s1)
+	g2, _ := NewGossipComponent(endpoint2, s2, "localhost:5611")
+	g3, _ := NewGossipComponent(endpoint3, s3, "localhost:5611")
+	go s1.Serve(ll1)
+	go s2.Serve(ll2)
+	go s2.Serve(ll3)
+
+	time.Sleep(time.Second * 5)
+	fmt.Println(g1.GetPeers())
+	fmt.Println(g2.GetPeers())
+	fmt.Println(g3.GetPeers())
+	time.Sleep(time.Second)
+}