open-consul/agent/router/manager_internal_test.go

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package router
import (
"bytes"
"fmt"
"math/rand"
"net"
"testing"
"time"
"github.com/hashicorp/consul/agent/metadata"
"github.com/hashicorp/go-hclog"
"github.com/stretchr/testify/require"
)
var (
localLogBuffer *bytes.Buffer
)
func init() {
localLogBuffer = new(bytes.Buffer)
}
func GetBufferedLogger() hclog.Logger {
localLogBuffer = new(bytes.Buffer)
return hclog.New(&hclog.LoggerOptions{
Level: 0,
Output: localLogBuffer,
})
}
type fauxConnPool struct {
// failPct between 0.0 and 1.0 == pct of time a Ping should fail
failPct float64
}
func (cp *fauxConnPool) Ping(string, string, net.Addr) (bool, error) {
var success bool
successProb := rand.Float64()
if successProb > cp.failPct {
success = true
}
return success, nil
}
type fauxSerf struct {
numNodes int
}
func (s *fauxSerf) NumNodes() int {
return s.numNodes
}
func testManager() (m *Manager) {
logger := GetBufferedLogger()
shutdownCh := make(chan struct{})
m = New(logger, shutdownCh, &fauxSerf{numNodes: 16384}, &fauxConnPool{}, "")
return m
}
func testManagerFailProb(failPct float64) (m *Manager) {
logger := GetBufferedLogger()
shutdownCh := make(chan struct{})
m = New(logger, shutdownCh, &fauxSerf{}, &fauxConnPool{failPct: failPct}, "")
return m
}
// func (l *serverList) cycleServer() (servers []*metadata.Server) {
func TestManagerInternal_cycleServer(t *testing.T) {
m := testManager()
l := m.getServerList()
server0 := &metadata.Server{Name: "server1"}
server1 := &metadata.Server{Name: "server2"}
server2 := &metadata.Server{Name: "server3"}
l.servers = append(l.servers, server0, server1, server2)
m.saveServerList(l)
l = m.getServerList()
if len(l.servers) != 3 {
t.Fatalf("server length incorrect: %d/3", len(l.servers))
}
if l.servers[0] != server0 &&
l.servers[1] != server1 &&
l.servers[2] != server2 {
t.Fatalf("initial server ordering not correct")
}
l.servers = l.cycleServer()
if len(l.servers) != 3 {
t.Fatalf("server length incorrect: %d/3", len(l.servers))
}
if l.servers[0] != server1 &&
l.servers[1] != server2 &&
l.servers[2] != server0 {
t.Fatalf("server ordering after one cycle not correct")
}
l.servers = l.cycleServer()
if len(l.servers) != 3 {
t.Fatalf("server length incorrect: %d/3", len(l.servers))
}
if l.servers[0] != server2 &&
l.servers[1] != server0 &&
l.servers[2] != server1 {
t.Fatalf("server ordering after two cycles not correct")
}
l.servers = l.cycleServer()
if len(l.servers) != 3 {
t.Fatalf("server length incorrect: %d/3", len(l.servers))
}
if l.servers[0] != server0 &&
l.servers[1] != server1 &&
l.servers[2] != server2 {
t.Fatalf("server ordering after three cycles not correct")
}
}
// func (m *Manager) getServerList() serverList {
func TestManagerInternal_getServerList(t *testing.T) {
m := testManager()
l := m.getServerList()
if l.servers == nil {
t.Fatalf("serverList.servers nil")
}
if len(l.servers) != 0 {
t.Fatalf("serverList.servers length not zero")
}
}
func TestManagerInternal_New(t *testing.T) {
m := testManager()
if m == nil {
t.Fatalf("Manager nil")
}
if m.clusterInfo == nil {
t.Fatalf("Manager.clusterInfo nil")
}
if m.logger == nil {
t.Fatalf("Manager.logger nil")
}
if m.shutdownCh == nil {
t.Fatalf("Manager.shutdownCh nil")
}
}
// func (m *Manager) reconcileServerList(l *serverList) bool {
func TestManagerInternal_reconcileServerList(t *testing.T) {
tests := []int{0, 1, 2, 3, 4, 5, 10, 100}
for _, n := range tests {
ok, err := test_reconcileServerList(n)
if !ok {
t.Errorf("Expected %d to pass: %v", n, err)
}
}
}
func test_reconcileServerList(maxServers int) (bool, error) {
// Build a server list, reconcile, verify the missing servers are
// missing, the added have been added, and the original server is
// present.
const failPct = 0.5
m := testManagerFailProb(failPct)
var failedServers, healthyServers []*metadata.Server
for i := 0; i < maxServers; i++ {
nodeName := fmt.Sprintf("s%02d", i)
node := &metadata.Server{Name: nodeName}
// Add 66% of servers to Manager
if rand.Float64() > 0.33 {
m.AddServer(node)
// Of healthy servers, (ab)use connPoolPinger to
// failPct of the servers for the reconcile. This
// allows for the selected server to no longer be
// healthy for the reconcile below.
if ok, _ := m.connPoolPinger.Ping(node.Datacenter, node.ShortName, node.Addr); ok {
// Will still be present
healthyServers = append(healthyServers, node)
} else {
// Will be missing
failedServers = append(failedServers, node)
}
} else {
// Will be added from the call to reconcile
healthyServers = append(healthyServers, node)
}
}
// Randomize Manager's server list
m.RebalanceServers()
selectedServer := m.FindServer()
var selectedServerFailed bool
for _, s := range failedServers {
if selectedServer.Key().Equal(s.Key()) {
selectedServerFailed = true
break
}
}
// Update Manager's server list to be "healthy" based on Serf.
// Reconcile this with origServers, which is shuffled and has a live
// connection, but possibly out of date.
origServers := m.getServerList()
m.saveServerList(serverList{servers: healthyServers})
// This should always succeed with non-zero server lists
if !selectedServerFailed && !m.reconcileServerList(&origServers) &&
len(m.getServerList().servers) != 0 &&
len(origServers.servers) != 0 {
// If the random gods are unfavorable and we end up with zero
// length lists, expect things to fail and retry the test.
return false, fmt.Errorf("Expected reconcile to succeed: %v %d %d",
selectedServerFailed,
len(m.getServerList().servers),
len(origServers.servers))
}
// If we have zero-length server lists, test succeeded in degenerate
// case.
if len(m.getServerList().servers) == 0 &&
len(origServers.servers) == 0 {
// Failed as expected w/ zero length list
return true, nil
}
resultingServerMap := make(map[metadata.Key]bool)
for _, s := range m.getServerList().servers {
resultingServerMap[*s.Key()] = true
}
// Test to make sure no failed servers are in the Manager's
// list. Error if there are any failedServers in l.servers
for _, s := range failedServers {
_, ok := resultingServerMap[*s.Key()]
if ok {
return false, fmt.Errorf("Found failed server %v in merged list %v", s, resultingServerMap)
}
}
// Test to make sure all healthy servers are in the healthy list.
if len(healthyServers) != len(m.getServerList().servers) {
return false, fmt.Errorf("Expected healthy map and servers to match: %d/%d", len(healthyServers), len(healthyServers))
}
// Test to make sure all healthy servers are in the resultingServerMap list.
for _, s := range healthyServers {
_, ok := resultingServerMap[*s.Key()]
if !ok {
return false, fmt.Errorf("Server %v missing from healthy map after merged lists", s)
}
}
return true, nil
}
// func (l *serverList) refreshServerRebalanceTimer() {
func TestManagerInternal_refreshServerRebalanceTimer(t *testing.T) {
type clusterSizes struct {
numNodes int
numServers int
minRebalance time.Duration
}
clusters := []clusterSizes{
{0, 3, 2 * time.Minute},
{1, 0, 2 * time.Minute}, // partitioned cluster
{1, 3, 2 * time.Minute},
{2, 3, 2 * time.Minute},
{100, 0, 2 * time.Minute}, // partitioned
{100, 1, 2 * time.Minute}, // partitioned
{100, 3, 2 * time.Minute},
{1024, 1, 2 * time.Minute}, // partitioned
{1024, 3, 2 * time.Minute}, // partitioned
{1024, 5, 2 * time.Minute},
{16384, 1, 4 * time.Minute}, // partitioned
{16384, 2, 2 * time.Minute}, // partitioned
{16384, 3, 2 * time.Minute}, // partitioned
{16384, 5, 2 * time.Minute},
{65535, 0, 2 * time.Minute}, // partitioned
{65535, 1, 8 * time.Minute}, // partitioned
{65535, 2, 3 * time.Minute}, // partitioned
{65535, 3, 5 * time.Minute}, // partitioned
{65535, 5, 3 * time.Minute}, // partitioned
{65535, 7, 2 * time.Minute},
{1000000, 1, 4 * time.Hour}, // partitioned
{1000000, 2, 2 * time.Hour}, // partitioned
{1000000, 3, 80 * time.Minute}, // partitioned
{1000000, 5, 50 * time.Minute}, // partitioned
{1000000, 11, 20 * time.Minute}, // partitioned
{1000000, 19, 10 * time.Minute},
}
logger := GetBufferedLogger()
shutdownCh := make(chan struct{})
for _, s := range clusters {
m := New(logger, shutdownCh, &fauxSerf{numNodes: s.numNodes}, &fauxConnPool{}, "")
for i := 0; i < s.numServers; i++ {
nodeName := fmt.Sprintf("s%02d", i)
m.AddServer(&metadata.Server{Name: nodeName})
}
d := m.refreshServerRebalanceTimer()
if d < s.minRebalance {
t.Errorf("duration too short for cluster of size %d and %d servers (%s < %s)", s.numNodes, s.numServers, d, s.minRebalance)
}
}
}
// func (m *Manager) saveServerList(l serverList) {
func TestManagerInternal_saveServerList(t *testing.T) {
m := testManager()
// Initial condition
func() {
l := m.getServerList()
if len(l.servers) != 0 {
t.Fatalf("Manager.saveServerList failed to load init config")
}
newServer := new(metadata.Server)
l.servers = append(l.servers, newServer)
m.saveServerList(l)
}()
// Test that save works
func() {
l1 := m.getServerList()
t1NumServers := len(l1.servers)
if t1NumServers != 1 {
t.Fatalf("Manager.saveServerList failed to save mutated config")
}
}()
// Verify mutation w/o a save doesn't alter the original
func() {
newServer := new(metadata.Server)
l := m.getServerList()
l.servers = append(l.servers, newServer)
l_orig := m.getServerList()
origNumServers := len(l_orig.servers)
if origNumServers >= len(l.servers) {
t.Fatalf("Manager.saveServerList unsaved config overwrote original")
}
}()
}
func TestManager_healthyServer(t *testing.T) {
t.Run("checking itself", func(t *testing.T) {
m := testManager()
m.serverName = "s1"
server := metadata.Server{Name: m.serverName}
require.True(t, m.healthyServer(&server))
})
t.Run("checking another server with successful ping", func(t *testing.T) {
m := testManager()
server := metadata.Server{Name: "s1"}
require.True(t, m.healthyServer(&server))
})
t.Run("checking another server with failed ping", func(t *testing.T) {
m := testManagerFailProb(1)
server := metadata.Server{Name: "s1"}
require.False(t, m.healthyServer(&server))
})
}
func TestManager_Rebalance(t *testing.T) {
t.Run("single server cluster checking itself", func(t *testing.T) {
m := testManager()
m.serverName = "s1"
m.AddServer(&metadata.Server{Name: m.serverName})
m.RebalanceServers()
require.False(t, m.IsOffline())
})
t.Run("multi server cluster is unhealthy when pings always fail", func(t *testing.T) {
m := testManagerFailProb(1)
m.AddServer(&metadata.Server{Name: "s1"})
m.AddServer(&metadata.Server{Name: "s2"})
m.AddServer(&metadata.Server{Name: "s3"})
for i := 0; i < 100; i++ {
m.RebalanceServers()
require.True(t, m.IsOffline())
}
})
t.Run("multi server cluster checking itself remains healthy despite pings always fail", func(t *testing.T) {
m := testManagerFailProb(1)
m.serverName = "s1"
m.AddServer(&metadata.Server{Name: m.serverName})
m.AddServer(&metadata.Server{Name: "s2"})
m.AddServer(&metadata.Server{Name: "s3"})
for i := 0; i < 100; i++ {
m.RebalanceServers()
require.False(t, m.IsOffline())
}
})
}