409 lines
9.4 KiB
Go
409 lines
9.4 KiB
Go
package servers_test
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import (
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"fmt"
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"log"
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"math/rand"
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"os"
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"strings"
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"testing"
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"github.com/hashicorp/consul/consul/agent"
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"github.com/hashicorp/consul/consul/servers"
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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) PingConsulServer(server *agent.Server) (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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}
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func (s *fauxSerf) NumNodes() int {
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return 16384
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}
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func testManager() (m *servers.Manager) {
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logger := log.New(os.Stderr, "", log.LstdFlags)
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shutdownCh := make(chan struct{})
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m = servers.New(logger, shutdownCh, &fauxSerf{}, &fauxConnPool{})
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return m
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}
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func testManagerFailProb(failPct float64) (m *servers.Manager) {
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logger := log.New(os.Stderr, "", log.LstdFlags)
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shutdownCh := make(chan struct{})
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m = servers.New(logger, shutdownCh, &fauxSerf{}, &fauxConnPool{failPct: failPct})
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return m
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}
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// func (m *Manager) AddServer(server *agent.Server) {
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func TestServers_AddServer(t *testing.T) {
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m := testManager()
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var num int
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num = m.NumServers()
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if num != 0 {
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t.Fatalf("Expected zero servers to start")
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}
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s1 := &agent.Server{Name: "s1"}
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m.AddServer(s1)
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num = m.NumServers()
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if num != 1 {
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t.Fatalf("Expected one server")
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}
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m.AddServer(s1)
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num = m.NumServers()
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if num != 1 {
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t.Fatalf("Expected one server (still)")
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}
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s2 := &agent.Server{Name: "s2"}
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m.AddServer(s2)
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num = m.NumServers()
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if num != 2 {
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t.Fatalf("Expected two servers")
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}
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}
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// func (m *Manager) IsOffline() bool {
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func TestServers_IsOffline(t *testing.T) {
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m := testManager()
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if !m.IsOffline() {
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t.Fatalf("bad")
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}
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s1 := &agent.Server{Name: "s1"}
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m.AddServer(s1)
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if m.IsOffline() {
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t.Fatalf("bad")
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}
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m.RebalanceServers()
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if m.IsOffline() {
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t.Fatalf("bad")
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}
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m.RemoveServer(s1)
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m.RebalanceServers()
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if !m.IsOffline() {
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t.Fatalf("bad")
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}
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const failPct = 0.5
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m = testManagerFailProb(failPct)
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m.AddServer(s1)
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var on, off int
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for i := 0; i < 100; i++ {
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m.RebalanceServers()
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if m.IsOffline() {
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off++
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} else {
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on++
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}
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}
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if on == 0 || off == 0 {
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t.Fatalf("bad: %d %d", on, off)
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}
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}
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// func (m *Manager) FindServer() (server *agent.Server) {
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func TestServers_FindServer(t *testing.T) {
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m := testManager()
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if m.FindServer() != nil {
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t.Fatalf("Expected nil return")
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}
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m.AddServer(&agent.Server{Name: "s1"})
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if m.NumServers() != 1 {
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t.Fatalf("Expected one server")
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}
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s1 := m.FindServer()
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if s1 == nil {
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t.Fatalf("Expected non-nil server")
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}
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if s1.Name != "s1" {
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t.Fatalf("Expected s1 server")
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}
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s1 = m.FindServer()
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if s1 == nil || s1.Name != "s1" {
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t.Fatalf("Expected s1 server (still)")
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}
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m.AddServer(&agent.Server{Name: "s2"})
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if m.NumServers() != 2 {
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t.Fatalf("Expected two servers")
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}
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s1 = m.FindServer()
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if s1 == nil || s1.Name != "s1" {
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t.Fatalf("Expected s1 server (still)")
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}
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m.NotifyFailedServer(s1)
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s2 := m.FindServer()
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if s2 == nil || s2.Name != "s2" {
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t.Fatalf("Expected s2 server")
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}
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m.NotifyFailedServer(s2)
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s1 = m.FindServer()
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if s1 == nil || s1.Name != "s1" {
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t.Fatalf("Expected s1 server")
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}
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}
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// func New(logger *log.Logger, shutdownCh chan struct{}) (m *Manager) {
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func TestServers_New(t *testing.T) {
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logger := log.New(os.Stderr, "", log.LstdFlags)
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shutdownCh := make(chan struct{})
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m := servers.New(logger, shutdownCh, &fauxSerf{}, &fauxConnPool{})
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if m == nil {
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t.Fatalf("Manager nil")
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}
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}
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// func (m *Manager) NotifyFailedServer(server *agent.Server) {
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func TestServers_NotifyFailedServer(t *testing.T) {
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m := testManager()
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if m.NumServers() != 0 {
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t.Fatalf("Expected zero servers to start")
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}
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s1 := &agent.Server{Name: "s1"}
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s2 := &agent.Server{Name: "s2"}
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// Try notifying for a server that is not managed by Manager
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m.NotifyFailedServer(s1)
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if m.NumServers() != 0 {
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t.Fatalf("Expected zero servers to start")
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}
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m.AddServer(s1)
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// Test again w/ a server not in the list
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m.NotifyFailedServer(s2)
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if m.NumServers() != 1 {
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t.Fatalf("Expected one server")
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}
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m.AddServer(s2)
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if m.NumServers() != 2 {
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t.Fatalf("Expected two servers")
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}
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s1 = m.FindServer()
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if s1 == nil || s1.Name != "s1" {
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t.Fatalf("Expected s1 server")
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}
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m.NotifyFailedServer(s2)
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s1 = m.FindServer()
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if s1 == nil || s1.Name != "s1" {
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t.Fatalf("Expected s1 server (still)")
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}
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m.NotifyFailedServer(s1)
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s2 = m.FindServer()
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if s2 == nil || s2.Name != "s2" {
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t.Fatalf("Expected s2 server")
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}
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m.NotifyFailedServer(s2)
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s1 = m.FindServer()
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if s1 == nil || s1.Name != "s1" {
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t.Fatalf("Expected s1 server")
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}
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}
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// func (m *Manager) NumServers() (numServers int) {
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func TestServers_NumServers(t *testing.T) {
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m := testManager()
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var num int
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num = m.NumServers()
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if num != 0 {
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t.Fatalf("Expected zero servers to start")
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}
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s := &agent.Server{}
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m.AddServer(s)
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num = m.NumServers()
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if num != 1 {
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t.Fatalf("Expected one server after AddServer")
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}
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}
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// func (m *Manager) RebalanceServers() {
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func TestServers_RebalanceServers(t *testing.T) {
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const failPct = 0.5
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m := testManagerFailProb(failPct)
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const maxServers = 100
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const numShuffleTests = 100
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const uniquePassRate = 0.5
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// Make a huge list of nodes.
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for i := 0; i < maxServers; i++ {
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nodeName := fmt.Sprintf("s%02d", i)
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m.AddServer(&agent.Server{Name: nodeName})
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}
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// Keep track of how many unique shuffles we get.
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uniques := make(map[string]struct{}, maxServers)
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for i := 0; i < numShuffleTests; i++ {
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m.RebalanceServers()
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var names []string
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for j := 0; j < maxServers; j++ {
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server := m.FindServer()
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m.NotifyFailedServer(server)
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names = append(names, server.Name)
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}
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key := strings.Join(names, "|")
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uniques[key] = struct{}{}
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}
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// We have to allow for the fact that there won't always be a unique
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// shuffle each pass, so we just look for smell here without the test
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// being flaky.
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if len(uniques) < int(maxServers*uniquePassRate) {
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t.Fatalf("unique shuffle ratio too low: %d/%d", len(uniques), maxServers)
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}
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}
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// func (m *Manager) RemoveServer(server *agent.Server) {
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func TestManager_RemoveServer(t *testing.T) {
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const nodeNameFmt = "s%02d"
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m := testManager()
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if m.NumServers() != 0 {
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t.Fatalf("Expected zero servers to start")
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}
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// Test removing server before its added
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nodeName := fmt.Sprintf(nodeNameFmt, 1)
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s1 := &agent.Server{Name: nodeName}
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m.RemoveServer(s1)
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m.AddServer(s1)
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nodeName = fmt.Sprintf(nodeNameFmt, 2)
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s2 := &agent.Server{Name: nodeName}
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m.RemoveServer(s2)
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m.AddServer(s2)
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const maxServers = 19
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servers := make([]*agent.Server, maxServers)
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// Already added two servers above
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for i := maxServers; i > 2; i-- {
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nodeName := fmt.Sprintf(nodeNameFmt, i)
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server := &agent.Server{Name: nodeName}
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servers = append(servers, server)
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m.AddServer(server)
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}
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if m.NumServers() != maxServers {
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t.Fatalf("Expected %d servers, received %d", maxServers, m.NumServers())
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}
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m.RebalanceServers()
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if m.NumServers() != maxServers {
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t.Fatalf("Expected %d servers, received %d", maxServers, m.NumServers())
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}
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findServer := func(server *agent.Server) bool {
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for i := m.NumServers(); i > 0; i-- {
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s := m.FindServer()
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if s == server {
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return true
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}
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}
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return false
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}
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expectedNumServers := maxServers
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removedServers := make([]*agent.Server, 0, maxServers)
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// Remove servers from the front of the list
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for i := 3; i > 0; i-- {
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server := m.FindServer()
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if server == nil {
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t.Fatalf("FindServer returned nil")
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}
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m.RemoveServer(server)
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expectedNumServers--
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if m.NumServers() != expectedNumServers {
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t.Fatalf("Expected %d servers (got %d)", expectedNumServers, m.NumServers())
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}
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if findServer(server) == true {
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t.Fatalf("Did not expect to find server %s after removal from the front", server.Name)
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}
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removedServers = append(removedServers, server)
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}
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// Remove server from the end of the list
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for i := 3; i > 0; i-- {
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server := m.FindServer()
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m.NotifyFailedServer(server)
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m.RemoveServer(server)
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expectedNumServers--
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if m.NumServers() != expectedNumServers {
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t.Fatalf("Expected %d servers (got %d)", expectedNumServers, m.NumServers())
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}
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if findServer(server) == true {
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t.Fatalf("Did not expect to find server %s", server.Name)
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}
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removedServers = append(removedServers, server)
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}
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// Remove server from the middle of the list
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for i := 3; i > 0; i-- {
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server := m.FindServer()
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m.NotifyFailedServer(server)
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server2 := m.FindServer()
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m.NotifyFailedServer(server2) // server2 now at end of the list
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m.RemoveServer(server)
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expectedNumServers--
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if m.NumServers() != expectedNumServers {
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t.Fatalf("Expected %d servers (got %d)", expectedNumServers, m.NumServers())
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}
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if findServer(server) == true {
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t.Fatalf("Did not expect to find server %s", server.Name)
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}
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removedServers = append(removedServers, server)
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}
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if m.NumServers()+len(removedServers) != maxServers {
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t.Fatalf("Expected %d+%d=%d servers", m.NumServers(), len(removedServers), maxServers)
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}
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// Drain the remaining servers from the middle
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for i := m.NumServers(); i > 0; i-- {
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server := m.FindServer()
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m.NotifyFailedServer(server)
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server2 := m.FindServer()
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m.NotifyFailedServer(server2) // server2 now at end of the list
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m.RemoveServer(server)
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removedServers = append(removedServers, server)
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}
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if m.NumServers() != 0 {
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t.Fatalf("Expected an empty server list")
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}
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if len(removedServers) != maxServers {
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t.Fatalf("Expected all servers to be in removed server list")
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}
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}
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// func (m *Manager) Start() {
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