github.com/adnan-c/fabric_e2e_couchdb@v0.6.1-preview.0.20170228180935-21ce6b23cf91/gossip/election/adapter_test.go

/*
Copyright IBM Corp. 2017 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 election

import (
	"fmt"
	"strings"
	"sync"
	"testing"
	"time"

	"github.com/hyperledger/fabric/gossip/api"
	"github.com/hyperledger/fabric/gossip/common"
	"github.com/hyperledger/fabric/gossip/discovery"
	proto "github.com/hyperledger/fabric/protos/gossip"
)

func TestNewAdapter(t *testing.T) {
	selfNetworkMember := &discovery.NetworkMember{
		Endpoint: "p0",
		Metadata: []byte{},
		PKIid:    []byte{byte(0)},
	}
	mockGossip := newGossip("peer0", selfNetworkMember)

	peersCluster := newClusterOfPeers("0")
	peersCluster.addPeer("peer0", mockGossip)

	NewAdapter(mockGossip, selfNetworkMember, []byte("channel0"))
}

func TestAdapterImpl_CreateMessage(t *testing.T) {
	selfNetworkMember := &discovery.NetworkMember{
		Endpoint: "p0",
		Metadata: []byte{},
		PKIid:    []byte{byte(0)},
	}
	mockGossip := newGossip("peer0", selfNetworkMember)

	adapter := NewAdapter(mockGossip, selfNetworkMember, []byte("channel0"))
	msg := adapter.CreateMessage(true)

	if !msg.(*msgImpl).msg.IsLeadershipMsg() {
		t.Error("Newly created message should be LeadershipMsg")
	}

	if !msg.IsDeclaration() {
		t.Error("Newly created msg should be Declaration msg")
	}

	msg = adapter.CreateMessage(false)

	if !msg.(*msgImpl).msg.IsLeadershipMsg() {
		t.Error("Newly created message should be LeadershipMsg")
	}

	if !msg.IsProposal() || msg.IsDeclaration() {
		t.Error("Newly created msg should be Proposal msg")
	}
}

func TestAdapterImpl_Peers(t *testing.T) {
	_, adapters := createCluster(0, 1, 2, 3, 4, 5)

	peersPKIDs := make(map[string]string)
	peersPKIDs[string([]byte{0})] = string([]byte{0})
	peersPKIDs[string([]byte{1})] = string([]byte{1})
	peersPKIDs[string([]byte{2})] = string([]byte{2})
	peersPKIDs[string([]byte{3})] = string([]byte{2})
	peersPKIDs[string([]byte{4})] = string([]byte{4})
	peersPKIDs[string([]byte{5})] = string([]byte{5})

	for _, adapter := range adapters {
		peers := adapter.Peers()
		if len(peers) != 6 {
			t.Errorf("Should return 6 peers, not %d", len(peers))
		}

		for _, peer := range peers {
			if _, exist := peersPKIDs[peer.ID()]; !exist {
				t.Errorf("Peer %s PKID not found", peer.(*peerImpl).member.Endpoint)
			}
		}
	}

}

func TestAdapterImpl_Stop(t *testing.T) {
	_, adapters := createCluster(0, 1, 2, 3, 4, 5)
	var ch []<-chan Msg

	for _, adapter := range adapters {
		ch = append(ch, adapter.Accept())
	}

	for _, adapter := range adapters {
		adapter.Stop()
	}
}

func TestAdapterImpl_Gossip(t *testing.T) {
	_, adapters := createCluster(0, 1, 2)

	channels := make(map[string]<-chan Msg)

	for peerID, adapter := range adapters {
		channels[peerID] = adapter.Accept()
	}

	sender := adapters[fmt.Sprintf("Peer%d", 0)]

	sender.Gossip(sender.CreateMessage(true))

	totalMsg := 0

	timer := time.After(time.Duration(1) * time.Second)

	for {
		select {
		case <-timer:
			if totalMsg != 2 {
				t.Error("Not all messages accepted")
				t.FailNow()
			} else {
				return
			}
		case msg := <-channels[fmt.Sprintf("Peer%d", 1)]:
			if !msg.IsDeclaration() {
				t.Error("Msg should be declaration")
			} else if strings.Compare(msg.SenderID(), string(sender.self.PKIid)) != 0 {
				t.Error("Msg Sender is wrong")
			} else {
				totalMsg++
			}
		case msg := <-channels[fmt.Sprintf("Peer%d", 2)]:
			if !msg.IsDeclaration() {
				t.Error("Msg should be declaration")
			} else if strings.Compare(msg.SenderID(), string(sender.self.PKIid)) != 0 {
				t.Error("Msg Sender is wrong")
			} else {
				totalMsg++
			}
		}

	}

}

type mockMsgCrypto struct {
}

// Sign signs a message, returns a signed message on success
// or an error on failure
func (is *mockMsgCrypto) Sign(msg []byte) ([]byte, error) {
	return msg, nil
}

// Verify verifies a signed message
func (is *mockMsgCrypto) Verify(vkID, signature, message []byte) error {
	return nil
}

// Get returns the identity of a given pkiID, or error if such an identity
// isn't found
func (is *mockMsgCrypto) Get(pkiID common.PKIidType) (api.PeerIdentityType, error) {
	return nil, nil
}

type mockAcceptor struct {
	ch       chan *proto.GossipMessage
	acceptor common.MessageAcceptor
}

type peerMockGossip struct {
	cluster      *clusterOfPeers
	member       *discovery.NetworkMember
	acceptors    []*mockAcceptor
	acceptorLock *sync.RWMutex
	clusterLock  *sync.RWMutex
	id           string
}

func (g *peerMockGossip) Peers() []discovery.NetworkMember {

	g.clusterLock.RLock()
	if g.cluster == nil {
		return []discovery.NetworkMember{*g.member}
	}
	peerLock := g.cluster.peersLock
	g.clusterLock.RUnlock()

	peerLock.RLock()
	res := make([]discovery.NetworkMember, 0)
	g.clusterLock.RLock()
	for _, val := range g.cluster.peersGossip {
		res = append(res, *val.member)

	}
	g.clusterLock.RUnlock()
	peerLock.RUnlock()
	return res
}

func (g *peerMockGossip) Accept(acceptor common.MessageAcceptor, passThrough bool) (<-chan *proto.GossipMessage, <-chan proto.ReceivedMessage) {
	ch := make(chan *proto.GossipMessage, 100)
	g.acceptorLock.Lock()
	g.acceptors = append(g.acceptors, &mockAcceptor{
		ch:       ch,
		acceptor: acceptor,
	})
	g.acceptorLock.Unlock()
	return ch, nil
}

func (g *peerMockGossip) Gossip(msg *proto.GossipMessage) {
	g.clusterLock.RLock()
	if g.cluster == nil {
		return
	}
	peersLock := g.cluster.peersLock
	g.clusterLock.RUnlock()

	peersLock.RLock()
	g.clusterLock.RLock()
	for _, val := range g.cluster.peersGossip {
		if strings.Compare(val.id, g.id) != 0 {
			val.putToAcceptors(msg)
		}
	}
	g.clusterLock.RUnlock()
	peersLock.RUnlock()

}

func (g *peerMockGossip) putToAcceptors(msg *proto.GossipMessage) {
	g.acceptorLock.RLock()
	for _, acceptor := range g.acceptors {
		if acceptor.acceptor(msg) {
			if len(acceptor.ch) < 10 {
				acceptor.ch <- msg
			}
		}
	}
	g.acceptorLock.RUnlock()

}

func newGossip(peerID string, member *discovery.NetworkMember) *peerMockGossip {
	return &peerMockGossip{
		id:           peerID,
		member:       member,
		acceptorLock: &sync.RWMutex{},
		clusterLock:  &sync.RWMutex{},
		acceptors:    make([]*mockAcceptor, 0),
	}
}

type clusterOfPeers struct {
	peersGossip map[string]*peerMockGossip
	peersLock   *sync.RWMutex
	id          string
}

func (cop *clusterOfPeers) addPeer(peerID string, gossip *peerMockGossip) {
	cop.peersLock.Lock()
	cop.peersGossip[peerID] = gossip
	gossip.clusterLock.Lock()
	gossip.cluster = cop
	gossip.clusterLock.Unlock()
	cop.peersLock.Unlock()

}

func newClusterOfPeers(id string) *clusterOfPeers {
	return &clusterOfPeers{
		id:          id,
		peersGossip: make(map[string]*peerMockGossip),
		peersLock:   &sync.RWMutex{},
	}

}

func createCluster(peers ...int) (*clusterOfPeers, map[string]*adapterImpl) {
	adapters := make(map[string]*adapterImpl)
	cluster := newClusterOfPeers("0")
	for _, peer := range peers {
		peerEndpoint := fmt.Sprintf("Peer%d", peer)
		peerPKID := []byte{byte(peer)}
		peerMember := &discovery.NetworkMember{
			Metadata: []byte{},
			Endpoint: peerEndpoint,
			PKIid:    peerPKID,
		}

		mockGossip := newGossip(peerEndpoint, peerMember)
		adapter := NewAdapter(mockGossip, peerMember, []byte("channel0"))
		adapters[peerEndpoint] = adapter.(*adapterImpl)
		cluster.addPeer(peerEndpoint, mockGossip)
	}

	return cluster, adapters
}