425 lines
12 KiB
Go
425 lines
12 KiB
Go
package router
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import (
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"bytes"
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"fmt"
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"math/rand"
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"net"
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"testing"
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"time"
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"github.com/hashicorp/go-hclog"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"github.com/hashicorp/consul/agent/metadata"
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)
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var (
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localLogBuffer *bytes.Buffer
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)
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func init() {
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localLogBuffer = new(bytes.Buffer)
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}
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func GetBufferedLogger() hclog.Logger {
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localLogBuffer = new(bytes.Buffer)
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return hclog.New(&hclog.LoggerOptions{Output: localLogBuffer})
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}
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type fauxConnPool struct {
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// failPct between 0.0 and 1.0 == pct of time a Ping should fail
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failPct float64
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}
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func (cp *fauxConnPool) Ping(string, string, net.Addr) (bool, error) {
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var success bool
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successProb := rand.Float64()
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if successProb > cp.failPct {
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success = true
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}
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return success, nil
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}
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type fauxSerf struct {
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numNodes int
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}
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func (s *fauxSerf) NumNodes() int {
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return s.numNodes
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}
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func testManager() (m *Manager) {
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logger := GetBufferedLogger()
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shutdownCh := make(chan struct{})
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m = New(logger, shutdownCh, &fauxSerf{numNodes: 16384}, &fauxConnPool{}, "", noopRebalancer)
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return m
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}
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func noopRebalancer() {}
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func testManagerFailProb(failPct float64) (m *Manager) {
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logger := GetBufferedLogger()
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shutdownCh := make(chan struct{})
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m = New(logger, shutdownCh, &fauxSerf{}, &fauxConnPool{failPct: failPct}, "", noopRebalancer)
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return m
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}
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// func (l *serverList) cycleServer() (servers []*metadata.Server) {
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func TestManagerInternal_cycleServer(t *testing.T) {
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m := testManager()
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l := m.getServerList()
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server0 := &metadata.Server{Name: "server1"}
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server1 := &metadata.Server{Name: "server2"}
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server2 := &metadata.Server{Name: "server3"}
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l.servers = append(l.servers, server0, server1, server2)
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m.saveServerList(l)
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l = m.getServerList()
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if len(l.servers) != 3 {
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t.Fatalf("server length incorrect: %d/3", len(l.servers))
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}
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if l.servers[0] != server0 &&
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l.servers[1] != server1 &&
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l.servers[2] != server2 {
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t.Fatalf("initial server ordering not correct")
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}
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l.servers = l.cycleServer()
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if len(l.servers) != 3 {
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t.Fatalf("server length incorrect: %d/3", len(l.servers))
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}
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if l.servers[0] != server1 &&
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l.servers[1] != server2 &&
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l.servers[2] != server0 {
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t.Fatalf("server ordering after one cycle not correct")
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}
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l.servers = l.cycleServer()
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if len(l.servers) != 3 {
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t.Fatalf("server length incorrect: %d/3", len(l.servers))
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}
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if l.servers[0] != server2 &&
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l.servers[1] != server0 &&
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l.servers[2] != server1 {
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t.Fatalf("server ordering after two cycles not correct")
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}
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l.servers = l.cycleServer()
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if len(l.servers) != 3 {
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t.Fatalf("server length incorrect: %d/3", len(l.servers))
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}
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if l.servers[0] != server0 &&
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l.servers[1] != server1 &&
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l.servers[2] != server2 {
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t.Fatalf("server ordering after three cycles not correct")
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}
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}
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// func (m *Manager) getServerList() serverList {
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func TestManagerInternal_getServerList(t *testing.T) {
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m := testManager()
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l := m.getServerList()
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if l.servers == nil {
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t.Fatalf("serverList.servers nil")
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}
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if len(l.servers) != 0 {
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t.Fatalf("serverList.servers length not zero")
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}
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}
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func TestManagerInternal_New(t *testing.T) {
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m := testManager()
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if m == nil {
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t.Fatalf("Manager nil")
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}
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if m.clusterInfo == nil {
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t.Fatalf("Manager.clusterInfo nil")
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}
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if m.logger == nil {
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t.Fatalf("Manager.logger nil")
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}
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if m.shutdownCh == nil {
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t.Fatalf("Manager.shutdownCh nil")
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}
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}
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// func (m *Manager) reconcileServerList(l *serverList) bool {
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func TestManagerInternal_reconcileServerList(t *testing.T) {
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tests := []int{0, 1, 2, 3, 4, 5, 10, 100}
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for _, n := range tests {
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ok, err := test_reconcileServerList(n)
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if !ok {
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t.Errorf("Expected %d to pass: %v", n, err)
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}
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}
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}
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func test_reconcileServerList(maxServers int) (bool, error) {
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// Build a server list, reconcile, verify the missing servers are
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// missing, the added have been added, and the original server is
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// present.
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const failPct = 0.5
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m := testManagerFailProb(failPct)
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var failedServers, healthyServers []*metadata.Server
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for i := 0; i < maxServers; i++ {
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nodeName := fmt.Sprintf("s%02d", i)
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node := &metadata.Server{Name: nodeName}
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// Add 66% of servers to Manager
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if rand.Float64() > 0.33 {
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m.AddServer(node)
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// Of healthy servers, (ab)use connPoolPinger to
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// failPct of the servers for the reconcile. This
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// allows for the selected server to no longer be
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// healthy for the reconcile below.
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if ok, _ := m.connPoolPinger.Ping(node.Datacenter, node.ShortName, node.Addr); ok {
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// Will still be present
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healthyServers = append(healthyServers, node)
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} else {
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// Will be missing
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failedServers = append(failedServers, node)
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}
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} else {
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// Will be added from the call to reconcile
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healthyServers = append(healthyServers, node)
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}
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}
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// Randomize Manager's server list
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m.RebalanceServers()
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selectedServer := m.FindServer()
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var selectedServerFailed bool
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for _, s := range failedServers {
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if selectedServer.Key().Equal(s.Key()) {
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selectedServerFailed = true
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break
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}
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}
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// Update Manager's server list to be "healthy" based on Serf.
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// Reconcile this with origServers, which is shuffled and has a live
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// connection, but possibly out of date.
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origServers := m.getServerList()
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m.saveServerList(serverList{servers: healthyServers})
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// This should always succeed with non-zero server lists
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if !selectedServerFailed && !m.reconcileServerList(&origServers) &&
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len(m.getServerList().servers) != 0 &&
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len(origServers.servers) != 0 {
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// If the random gods are unfavorable and we end up with zero
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// length lists, expect things to fail and retry the test.
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return false, fmt.Errorf("Expected reconcile to succeed: %v %d %d",
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selectedServerFailed,
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len(m.getServerList().servers),
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len(origServers.servers))
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}
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// If we have zero-length server lists, test succeeded in degenerate
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// case.
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if len(m.getServerList().servers) == 0 &&
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len(origServers.servers) == 0 {
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// Failed as expected w/ zero length list
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return true, nil
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}
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resultingServerMap := make(map[metadata.Key]bool)
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for _, s := range m.getServerList().servers {
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resultingServerMap[*s.Key()] = true
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}
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// Test to make sure no failed servers are in the Manager's
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// list. Error if there are any failedServers in l.servers
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for _, s := range failedServers {
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_, ok := resultingServerMap[*s.Key()]
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if ok {
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return false, fmt.Errorf("Found failed server %v in merged list %v", s, resultingServerMap)
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}
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}
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// Test to make sure all healthy servers are in the healthy list.
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if len(healthyServers) != len(m.getServerList().servers) {
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return false, fmt.Errorf("Expected healthy map and servers to match: %d/%d", len(healthyServers), len(healthyServers))
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}
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// Test to make sure all healthy servers are in the resultingServerMap list.
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for _, s := range healthyServers {
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_, ok := resultingServerMap[*s.Key()]
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if !ok {
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return false, fmt.Errorf("Server %v missing from healthy map after merged lists", s)
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}
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}
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return true, nil
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}
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func TestRebalanceDelayer(t *testing.T) {
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type testCase struct {
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servers int
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nodes int
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expected time.Duration
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}
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testCases := []testCase{
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{servers: 0, nodes: 1},
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{servers: 0, nodes: 100},
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{servers: 0, nodes: 65535},
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{servers: 0, nodes: 1000000},
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{servers: 1, nodes: 100},
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{servers: 1, nodes: 1024},
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{servers: 1, nodes: 8192},
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{servers: 1, nodes: 11520},
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{servers: 1, nodes: 11521, expected: 3*time.Minute + 15625*time.Microsecond},
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{servers: 1, nodes: 16384, expected: 4*time.Minute + 16*time.Second},
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{servers: 1, nodes: 65535, expected: 17*time.Minute + 3984375000},
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{servers: 1, nodes: 1000000, expected: 4*time.Hour + 20*time.Minute + 25*time.Second},
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{servers: 2, nodes: 100},
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{servers: 2, nodes: 16384},
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{servers: 2, nodes: 23040},
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{servers: 2, nodes: 23041, expected: 3*time.Minute + 7812500},
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{servers: 2, nodes: 65535, expected: 8*time.Minute + 31992187500},
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{servers: 2, nodes: 1000000, expected: 2*time.Hour + 10*time.Minute + 12500*time.Millisecond},
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{servers: 3, nodes: 0},
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{servers: 3, nodes: 100},
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{servers: 3, nodes: 1024},
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{servers: 3, nodes: 16384},
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{servers: 3, nodes: 34560},
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{servers: 3, nodes: 34561, expected: 3*time.Minute + 5208333},
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{servers: 3, nodes: 65535, expected: 5*time.Minute + 41328125000},
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{servers: 3, nodes: 1000000, expected: 86*time.Minute + 48333333333},
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{servers: 5, nodes: 0},
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{servers: 5, nodes: 1024},
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{servers: 5, nodes: 16384},
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{servers: 5, nodes: 32768},
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{servers: 5, nodes: 57600},
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{servers: 5, nodes: 65535, expected: 3*time.Minute + 24796875000},
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{servers: 5, nodes: 1000000, expected: 52*time.Minute + 5*time.Second},
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{servers: 7, nodes: 65535},
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{servers: 7, nodes: 80500},
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{servers: 7, nodes: 131070, expected: 4*time.Minute + 52566964285},
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{servers: 11, nodes: 1000000, expected: 23*time.Minute + 40454545454},
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{servers: 19, nodes: 1000000, expected: 13*time.Minute + 42368421052},
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}
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for _, tc := range testCases {
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delay := delayer.Delay(tc.servers, tc.nodes)
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if tc.expected != 0 {
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assert.Equal(t, tc.expected, delay, "nodes=%d, servers=%d", tc.nodes, tc.servers)
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continue
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}
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min := 2 * time.Minute
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max := 3 * time.Minute
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if delay < min {
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t.Errorf("nodes=%d, servers=%d, expected >%v, actual %v", tc.nodes, tc.servers, min, delay)
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}
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if delay > max {
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t.Errorf("nodes=%d, servers=%d, expected <%v, actual %v", tc.nodes, tc.servers, max, delay)
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}
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}
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}
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// func (m *Manager) saveServerList(l serverList) {
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func TestManagerInternal_saveServerList(t *testing.T) {
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m := testManager()
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// Initial condition
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func() {
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l := m.getServerList()
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if len(l.servers) != 0 {
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t.Fatalf("Manager.saveServerList failed to load init config")
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}
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newServer := new(metadata.Server)
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l.servers = append(l.servers, newServer)
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m.saveServerList(l)
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}()
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// Test that save works
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func() {
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l1 := m.getServerList()
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t1NumServers := len(l1.servers)
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if t1NumServers != 1 {
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t.Fatalf("Manager.saveServerList failed to save mutated config")
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}
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}()
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// Verify mutation w/o a save doesn't alter the original
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func() {
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newServer := new(metadata.Server)
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l := m.getServerList()
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l.servers = append(l.servers, newServer)
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l_orig := m.getServerList()
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origNumServers := len(l_orig.servers)
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if origNumServers >= len(l.servers) {
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t.Fatalf("Manager.saveServerList unsaved config overwrote original")
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}
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}()
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}
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func TestManager_healthyServer(t *testing.T) {
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t.Run("checking itself", func(t *testing.T) {
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m := testManager()
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m.serverName = "s1"
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server := metadata.Server{Name: m.serverName}
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require.True(t, m.healthyServer(&server))
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})
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t.Run("checking another server with successful ping", func(t *testing.T) {
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m := testManager()
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server := metadata.Server{Name: "s1"}
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require.True(t, m.healthyServer(&server))
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})
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t.Run("checking another server with failed ping", func(t *testing.T) {
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m := testManagerFailProb(1)
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server := metadata.Server{Name: "s1"}
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require.False(t, m.healthyServer(&server))
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})
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}
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func TestManager_Rebalance(t *testing.T) {
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t.Run("single server cluster checking itself", func(t *testing.T) {
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m := testManager()
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m.serverName = "s1"
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m.AddServer(&metadata.Server{Name: m.serverName})
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m.RebalanceServers()
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require.False(t, m.IsOffline())
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})
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t.Run("multi server cluster is unhealthy when pings always fail", func(t *testing.T) {
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m := testManagerFailProb(1)
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m.AddServer(&metadata.Server{Name: "s1"})
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m.AddServer(&metadata.Server{Name: "s2"})
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m.AddServer(&metadata.Server{Name: "s3"})
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for i := 0; i < 100; i++ {
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m.RebalanceServers()
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require.True(t, m.IsOffline())
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}
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})
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t.Run("multi server cluster checking itself remains healthy despite pings always fail", func(t *testing.T) {
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m := testManagerFailProb(1)
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m.serverName = "s1"
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m.AddServer(&metadata.Server{Name: m.serverName})
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m.AddServer(&metadata.Server{Name: "s2"})
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m.AddServer(&metadata.Server{Name: "s3"})
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for i := 0; i < 100; i++ {
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m.RebalanceServers()
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require.False(t, m.IsOffline())
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}
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})
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}
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