/usr/share/gocode/src/github.com/weaveworks/mesh/gossip_test.go is in golang-github-weaveworks-mesh-dev 0+git20161024.3dd75b1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"fmt"
"io/ioutil"
"log"
"sync"
"testing"
"github.com/stretchr/testify/require"
)
// TODO test gossip unicast; atm we only test topology gossip and
// surrogates, neither of which employ unicast.
type mockGossipConnection struct {
remoteConnection
dest *Router
senders *gossipSenders
start chan struct{}
}
var _ gossipConnection = &mockGossipConnection{}
func newTestRouter(name string) *Router {
peerName, _ := PeerNameFromString(name)
router := NewRouter(Config{}, peerName, "nick", nil, log.New(ioutil.Discard, "", 0))
router.Start()
return router
}
func (conn *mockGossipConnection) breakTie(dupConn ourConnection) connectionTieBreak {
return tieBreakTied
}
func (conn *mockGossipConnection) shutdown(err error) {
}
func (conn *mockGossipConnection) logf(format string, args ...interface{}) {
format = "->[" + conn.remoteTCPAddr + "|" + conn.remote.String() + "]: " + format
if len(format) == 0 || format[len(format)-1] != '\n' {
format += "\n"
}
fmt.Printf(format, args...)
}
func (conn *mockGossipConnection) SendProtocolMsg(pm protocolMsg) error {
<-conn.start
return conn.dest.handleGossip(pm.tag, pm.msg)
}
func (conn *mockGossipConnection) gossipSenders() *gossipSenders {
return conn.senders
}
func (conn *mockGossipConnection) Start() {
close(conn.start)
}
func sendPendingGossip(routers ...*Router) {
// Loop until all routers report they didn't send anything
for sentSomething := true; sentSomething; {
sentSomething = false
for _, router := range routers {
sentSomething = router.sendPendingGossip() || sentSomething
}
}
}
func addTestGossipConnection(r1, r2 *Router) {
c1 := r1.newTestGossipConnection(r2)
c2 := r2.newTestGossipConnection(r1)
c1.Start()
c2.Start()
}
func (router *Router) newTestGossipConnection(r *Router) *mockGossipConnection {
to := r.Ourself.Peer
toPeer := newPeer(to.Name, to.NickName, to.UID, 0, to.ShortID)
toPeer = router.Peers.fetchWithDefault(toPeer) // Has side-effect of incrementing refcount
conn := &mockGossipConnection{
remoteConnection: *newRemoteConnection(router.Ourself.Peer, toPeer, "", false, true),
dest: r,
start: make(chan struct{}),
}
conn.senders = newGossipSenders(conn, make(chan struct{}))
router.Ourself.handleAddConnection(conn, false)
router.Ourself.handleConnectionEstablished(conn)
return conn
}
func (router *Router) DeleteTestGossipConnection(r *Router) {
toName := r.Ourself.Peer.Name
conn, _ := router.Ourself.ConnectionTo(toName)
router.Peers.dereference(conn.Remote())
router.Ourself.handleDeleteConnection(conn.(ourConnection))
}
// Create a Peer representing the receiver router, with connections to
// the routers supplied as arguments, carrying across all UID and
// version information.
func (router *Router) tp(routers ...*Router) *Peer {
peer := newPeerFrom(router.Ourself.Peer)
connections := make(map[PeerName]Connection)
for _, r := range routers {
p := newPeerFrom(r.Ourself.Peer)
connections[r.Ourself.Peer.Name] = newMockConnection(peer, p)
}
peer.Version = router.Ourself.Peer.Version
peer.connections = connections
return peer
}
// Check that the topology of router matches the peers and all of their connections
func checkTopology(t *testing.T, router *Router, wantedPeers ...*Peer) {
router.Peers.RLock()
checkTopologyPeers(t, true, router.Peers.allPeers(), wantedPeers...)
router.Peers.RUnlock()
}
func flushAndCheckTopology(t *testing.T, routers []*Router, wantedPeers ...*Peer) {
sendPendingGossip(routers...)
for _, r := range routers {
checkTopology(t, r, wantedPeers...)
}
}
func TestGossipTopology(t *testing.T) {
// Create some peers that will talk to each other
r1 := newTestRouter("01:00:00:01:00:00")
r2 := newTestRouter("02:00:00:02:00:00")
r3 := newTestRouter("03:00:00:03:00:00")
routers := []*Router{r1, r2, r3}
// Check state when they have no connections
checkTopology(t, r1, r1.tp())
checkTopology(t, r2, r2.tp())
// Now try adding some connections
addTestGossipConnection(r1, r2)
sendPendingGossip(r1, r2)
checkTopology(t, r1, r1.tp(r2), r2.tp(r1))
checkTopology(t, r2, r1.tp(r2), r2.tp(r1))
addTestGossipConnection(r2, r3)
flushAndCheckTopology(t, routers, r1.tp(r2), r2.tp(r1, r3), r3.tp(r2))
addTestGossipConnection(r3, r1)
flushAndCheckTopology(t, routers, r1.tp(r2, r3), r2.tp(r1, r3), r3.tp(r1, r2))
// Drop the connection from 2 to 3
r2.DeleteTestGossipConnection(r3)
flushAndCheckTopology(t, routers, r1.tp(r2, r3), r2.tp(r1), r3.tp(r1, r2))
// Drop the connection from 1 to 3
r1.DeleteTestGossipConnection(r3)
sendPendingGossip(r1, r2, r3)
checkTopology(t, r1, r1.tp(r2), r2.tp(r1))
checkTopology(t, r2, r1.tp(r2), r2.tp(r1))
// r3 still thinks r1 has a connection to it
checkTopology(t, r3, r1.tp(r2, r3), r2.tp(r1), r3.tp(r1, r2))
}
func TestGossipSurrogate(t *testing.T) {
// create the topology r1 <-> r2 <-> r3
r1 := newTestRouter("01:00:00:01:00:00")
r2 := newTestRouter("02:00:00:02:00:00")
r3 := newTestRouter("03:00:00:03:00:00")
routers := []*Router{r1, r2, r3}
addTestGossipConnection(r1, r2)
addTestGossipConnection(r3, r2)
flushAndCheckTopology(t, routers, r1.tp(r2), r2.tp(r1, r3), r3.tp(r2))
// create a gossiper at either end, but not the middle
g1 := newTestGossiper()
g3 := newTestGossiper()
s1 := r1.NewGossip("Test", g1)
s3 := r3.NewGossip("Test", g3)
// broadcast a message from each end, check it reaches the other
broadcast(s1, 1)
broadcast(s3, 2)
sendPendingGossip(r1, r2, r3)
g1.checkHas(t, 2)
g3.checkHas(t, 1)
// check that each end gets their message back through periodic
// gossip
r1.sendAllGossip()
r3.sendAllGossip()
sendPendingGossip(r1, r2, r3)
g1.checkHas(t, 1, 2)
g3.checkHas(t, 1, 2)
}
type testGossiper struct {
sync.RWMutex
state map[byte]struct{}
}
func newTestGossiper() *testGossiper {
return &testGossiper{state: make(map[byte]struct{})}
}
func (g *testGossiper) OnGossipUnicast(sender PeerName, msg []byte) error {
return nil
}
func (g *testGossiper) OnGossipBroadcast(_ PeerName, update []byte) (GossipData, error) {
g.Lock()
defer g.Unlock()
for _, v := range update {
g.state[v] = struct{}{}
}
return newSurrogateGossipData(update), nil
}
func (g *testGossiper) Gossip() GossipData {
g.RLock()
defer g.RUnlock()
state := make([]byte, len(g.state))
for v := range g.state {
state = append(state, v)
}
return newSurrogateGossipData(state)
}
func (g *testGossiper) OnGossip(update []byte) (GossipData, error) {
g.Lock()
defer g.Unlock()
var delta []byte
for _, v := range update {
if _, found := g.state[v]; !found {
delta = append(delta, v)
g.state[v] = struct{}{}
}
}
if len(delta) == 0 {
return nil, nil
}
return newSurrogateGossipData(delta), nil
}
func (g *testGossiper) checkHas(t *testing.T, vs ...byte) {
g.RLock()
defer g.RUnlock()
for _, v := range vs {
if _, found := g.state[v]; !found {
require.FailNow(t, fmt.Sprintf("%d is missing", v))
}
}
}
func broadcast(s Gossip, v byte) {
s.GossipBroadcast(newSurrogateGossipData([]byte{v}))
}
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