func (s *TestSuite) TestStartStop(t *C) {
mockConn := mock.NewNullMySQL()
mockConnFactory := &mock.ConnectionFactory{
Conn: mockConn,
}
m := monitor.NewMonitor(s.logger, mockConnFactory)
dsn := "fake:dsn@tcp(127.0.0.1:3306)/?parseTime=true"
/**
* Register new subscriber
*/
// Set initial uptime
mockConn.SetUptime(10)
t.Assert(mockConn.GetUptimeCount(), Equals, uint(0))
subChan, err := m.Add(dsn)
t.Assert(err, IsNil)
t.Assert(mockConn.GetUptimeCount(), Equals, uint(1), Commentf("MRMS didn't checked uptime after adding first subscriber"))
/**
* Start MRMS
*/
interval := 1 * time.Second
err = m.Start(interval)
t.Assert(err, IsNil)
// Imitate MySQL restart by setting uptime to 5s (previously 10s)
mockConn.SetUptime(5)
// After max 1 second it should notify subscriber about MySQL restart
var notified bool
select {
case notified = <-subChan:
case <-time.After(1 * time.Second):
}
t.Assert(notified, Equals, true, Commentf("MySQL was restarted but MRMS didn't notify subscribers"))
/**
* Stop MRMS
*/
err = m.Stop()
t.Assert(err, IsNil)
// Check status
status := m.Status()
t.Assert(status, DeepEquals, map[string]string{
monitor.MONITOR_NAME: "Stopped",
})
// Imitate MySQL restart by setting uptime to 1s (previously 5s)
mockConn.SetUptime(1)
// After stopping service it should not notify subscribers anymore
time.Sleep(2 * time.Second)
select {
case notified = <-subChan:
default:
}
t.Assert(notified, Equals, true, Commentf("MRMS notified subscribers after being stopped"))
}
func (s *TestSuite) TestGlobalSubscribe(t *C) {
mockConn := mock.NewNullMySQL()
mockConnFactory := &mock.ConnectionFactory{
Conn: mockConn,
}
m := monitor.NewMonitor(s.logger, mockConnFactory)
dsn := "fake:dsn@tcp(127.0.0.1:3306)/?parseTime=true"
subChan, err := m.Add(dsn)
t.Assert(err, IsNil)
t.Assert(subChan, NotNil)
gc, err := m.GlobalSubscribe()
t.Assert(err, IsNil)
t.Assert(gc, NotNil)
}
func (s *TestSuite) TestRealMySQL(t *C) {
if dsn == "" {
t.Skip("PCT_TEST_MYSQL_DSN is not set")
}
m := monitor.NewMonitor(s.logger, &mysql.RealConnectionFactory{})
c, err := m.Add(dsn)
t.Assert(err, IsNil)
defer m.Remove(dsn, c)
for i := 0; i < 2; i++ {
time.Sleep(1 * time.Second)
m.Check()
select {
case <-c:
t.Logf("False-positive restart reported on check number %d", i)
t.FailNow()
default:
}
}
}
func (s *TestSuite) Test2Subscribers(t *C) {
mockConn := mock.NewNullMySQL()
mockConnFactory := &mock.ConnectionFactory{
Conn: mockConn,
}
m := monitor.NewMonitor(s.logger, mockConnFactory)
dsn := "fake:dsn@tcp(127.0.0.1:3306)/?parseTime=true"
c1, err := m.Add(dsn)
t.Assert(err, IsNil)
c2, err := m.Add(dsn)
t.Assert(err, IsNil)
var notified bool
mockConn.SetUptime(1)
m.Check()
select {
case notified = <-c1:
default:
}
t.Check(notified, Equals, false)
select {
case notified = <-c2:
default:
}
t.Check(notified, Equals, false)
mockConn.SetUptime(2)
m.Check()
select {
case notified = <-c1:
default:
}
t.Check(notified, Equals, false)
select {
case notified = <-c2:
default:
}
t.Check(notified, Equals, false)
}
func run() error {
version := fmt.Sprintf("percona-agent %s%s rev %s", agent.VERSION, agent.REL, agent.REVISION)
if flagVersion {
fmt.Println(version)
return nil
}
golog.Printf("Running %s pid %d\n", version, os.Getpid())
if err := pct.Basedir.Init(flagBasedir); err != nil {
return err
}
// Start-lock file is used to let agent1 self-update, create start-lock,
// start updated agent2, exit cleanly, then agent2 starts. agent1 may
// not use a PID file, so this special file is required.
if err := pct.WaitStartLock(); err != nil {
return err
}
// NOTE: This must run last, and defer if LIFO, so it must be declared first.
defer os.Remove(pct.Basedir.File("start-lock"))
/**
* Agent config (require API key and agent UUID)
*/
if !pct.FileExists(pct.Basedir.ConfigFile("agent")) {
return fmt.Errorf("Agent config file %s does not exist", pct.Basedir.ConfigFile("agent"))
}
bytes, err := agent.LoadConfig()
if err != nil {
return fmt.Errorf("Invalid agent config: %s\n", err)
}
agentConfig := &agent.Config{}
if err := json.Unmarshal(bytes, agentConfig); err != nil {
return fmt.Errorf("Error parsing "+pct.Basedir.ConfigFile("agent")+": ", err)
}
golog.Println("ApiHostname: " + agentConfig.ApiHostname)
golog.Println("AgentUuid: " + agentConfig.AgentUuid)
/**
* Ping and exit, maybe.
*/
// Set for all connections to API. X-Percona-API-Key is set automatically
// using the pct.APIConnector.
headers := map[string]string{
"X-Percona-Agent-Version": agent.VERSION,
}
if flagPing {
t0 := time.Now()
code, err := pct.Ping(agentConfig.ApiHostname, agentConfig.ApiKey, headers)
d := time.Now().Sub(t0)
if err != nil || code != 200 {
return fmt.Errorf("Ping FAIL (%d %d %s)", d, code, err)
} else {
golog.Printf("Ping OK (%s)", d)
return nil
}
}
/**
* PID file
*/
pidFilePath := agentConfig.PidFile
if flagPidFile != "" {
pidFilePath = flagPidFile
}
if pidFilePath != "" {
pidFile := pct.NewPidFile()
if err := pidFile.Set(pidFilePath); err != nil {
golog.Fatalln(err)
}
defer pidFile.Remove()
}
/**
* REST API
*/
retry := -1 // unlimited
if flagStatus {
retry = 1
}
api, err := ConnectAPI(agentConfig, retry)
if err != nil {
golog.Fatal(err)
}
// Get agent status via API and exit.
if flagStatus {
code, bytes, err := api.Get(agentConfig.ApiKey, api.AgentLink("self")+"/status")
if err != nil {
return err
}
if code == 404 {
return fmt.Errorf("Agent not found")
}
status := make(map[string]string)
if err := json.Unmarshal(bytes, &status); err != nil {
return err
}
golog.Println(status)
return nil
}
/**
* Connection factory
*/
connFactory := &mysql.RealConnectionFactory{}
/**
* Log relay
*/
logChan := make(chan *proto.LogEntry, log.BUFFER_SIZE*3)
// Log websocket client, possibly disabled later.
logClient, err := client.NewWebsocketClient(pct.NewLogger(logChan, "log-ws"), api, "log", headers)
if err != nil {
golog.Fatalln(err)
}
logManager := log.NewManager(
logClient,
logChan,
)
if err := logManager.Start(); err != nil {
return fmt.Errorf("Error starting logmanager: %s\n", err)
}
/**
* MRMS (MySQL Restart Monitoring Service)
*/
mrm := mrmsMonitor.NewMonitor(
pct.NewLogger(logChan, "mrms-monitor"),
connFactory,
)
mrmsManager := mrms.NewManager(
pct.NewLogger(logChan, "mrms-manager"),
mrm,
)
if err := mrmsManager.Start(); err != nil {
return fmt.Errorf("Error starting mrms manager: %s\n", err)
}
/**
* Instance manager
*/
itManager := instance.NewManager(
pct.NewLogger(logChan, "instance-manager"),
pct.Basedir.Dir("config"),
api,
mrm,
)
if err := itManager.Start(); err != nil {
return fmt.Errorf("Error starting instance manager: %s\n", err)
}
/**
* Data spooler and sender
*/
hostname, _ := os.Hostname()
dataClient, err := client.NewWebsocketClient(pct.NewLogger(logChan, "data-ws"), api, "data", headers)
if err != nil {
golog.Fatalln(err)
}
dataManager := data.NewManager(
pct.NewLogger(logChan, "data"),
pct.Basedir.Dir("data"),
pct.Basedir.Dir("trash"),
hostname,
dataClient,
)
if err := dataManager.Start(); err != nil {
return fmt.Errorf("Error starting data manager: %s\n", err)
}
/**
* Collecct/report ticker (master clock)
*/
nowFunc := func() int64 { return time.Now().UTC().UnixNano() }
clock := ticker.NewClock(&ticker.RealTickerFactory{}, nowFunc)
/**
* Metric and system config monitors
*/
mmManager := mm.NewManager(
pct.NewLogger(logChan, "mm"),
mmMonitor.NewFactory(logChan, itManager.Repo(), mrm),
clock,
dataManager.Spooler(),
itManager.Repo(),
mrm,
)
if err := mmManager.Start(); err != nil {
return fmt.Errorf("Error starting mm manager: %s\n", err)
}
sysconfigManager := sysconfig.NewManager(
pct.NewLogger(logChan, "sysconfig"),
sysconfigMonitor.NewFactory(logChan, itManager.Repo()),
clock,
dataManager.Spooler(),
itManager.Repo(),
)
if err := sysconfigManager.Start(); err != nil {
return fmt.Errorf("Error starting sysconfig manager: %s\n", err)
}
/**
* Query service (real-time EXPLAIN, SHOW CREATE TABLE, etc.)
*/
queryManager := query.NewManager(
pct.NewLogger(logChan, "query"),
itManager.Repo(),
&mysql.RealConnectionFactory{},
)
if err := queryManager.Start(); err != nil {
return fmt.Errorf("Error starting query manager: %s\n", err)
}
/**
* Query Analytics
*/
qanManager := qan.NewManager(
pct.NewLogger(logChan, "qan"),
clock,
itManager.Repo(),
mrm,
connFactory,
qanFactory.NewRealAnalyzerFactory(
logChan,
qanFactory.NewRealIntervalIterFactory(logChan),
slowlog.NewRealWorkerFactory(logChan),
perfschema.NewRealWorkerFactory(logChan),
dataManager.Spooler(),
clock,
),
)
if err := qanManager.Start(); err != nil {
return fmt.Errorf("Error starting qan manager: %s\n", err)
}
/**
* Sysinfo
*/
sysinfoManager := sysinfo.NewManager(
pct.NewLogger(logChan, "sysinfo"),
)
// MySQL Sysinfo
mysqlSysinfoService := mysqlSysinfo.NewMySQL(
pct.NewLogger(logChan, "sysinfo-mysql"),
itManager.Repo(),
)
if err := sysinfoManager.RegisterService("MySQLSummary", mysqlSysinfoService); err != nil {
return fmt.Errorf("Error registering Mysql Sysinfo service: %s\n", err)
}
// System Sysinfo
systemSysinfoService := systemSysinfo.NewSystem(
pct.NewLogger(logChan, "sysinfo-system"),
)
if err := sysinfoManager.RegisterService("SystemSummary", systemSysinfoService); err != nil {
return fmt.Errorf("Error registering System Sysinfo service: %s\n", err)
}
// Start Sysinfo manager
if err := sysinfoManager.Start(); err != nil {
return fmt.Errorf("Error starting Sysinfo manager: %s\n", err)
}
/**
* Signal handler
*/
// Generally the agent has a crash-only design, but QAN is so far the only service
// which reconfigures MySQL: it enables the slow log, sets long_query_time, etc.
// It's not terrible to leave slow log on, but it's nicer to turn it off.
sigChan := make(chan os.Signal, 1)
stopChan := make(chan error, 2)
signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
go func() {
sig := <-sigChan
golog.Printf("Caught %s signal, shutting down...\n", sig)
stopChan <- qanManager.Stop()
}()
/**
* Agent
*/
cmdClient, err := client.NewWebsocketClient(pct.NewLogger(logChan, "agent-ws"), api, "cmd", headers)
if err != nil {
golog.Fatal(err)
}
// The official list of services known to the agent. Adding a new service
// requires a manager, starting the manager as above, and adding the manager
// to this map.
services := map[string]pct.ServiceManager{
"log": logManager,
"data": dataManager,
"qan": qanManager,
"mm": mmManager,
"instance": itManager,
"mrms": mrmsManager,
"sysconfig": sysconfigManager,
"query": queryManager,
"sysinfo": sysinfoManager,
}
// Set the global pct/cmd.Factory, used for the Restart cmd.
pctCmd.Factory = &pctCmd.RealCmdFactory{}
agentLogger := pct.NewLogger(logChan, "agent")
agent := agent.NewAgent(
agentConfig,
agentLogger,
api,
cmdClient,
services,
)
/**
* Run agent, wait for it to stop, signal, or crash.
*/
var stopErr error
go func() {
defer func() {
if err := recover(); err != nil {
errMsg := fmt.Sprintf("Agent crashed: %s", err)
golog.Println(errMsg)
agentLogger.Error(errMsg)
stopChan <- fmt.Errorf("%s", errMsg)
}
}()
stopChan <- agent.Run()
}()
// Wait for agent to stop, or for signals.
agentRunning := true
statusSigChan := make(chan os.Signal, 1)
signal.Notify(statusSigChan, syscall.SIGUSR1) // kill -USER1 PID
reconnectSigChan := make(chan os.Signal, 1)
signal.Notify(reconnectSigChan, syscall.SIGHUP) // kill -HUP PID
for agentRunning {
select {
case stopErr = <-stopChan: // agent or signal
golog.Println("Agent stopped, shutting down...")
agentLogger.Info("Agent stopped")
agentRunning = false
case <-statusSigChan:
status := agent.AllStatus()
golog.Printf("Status: %+v\n", status)
case <-reconnectSigChan:
u, _ := user.Current()
cmd := &proto.Cmd{
Ts: time.Now().UTC(),
User: u.Username + " (SIGHUP)",
AgentUuid: agentConfig.AgentUuid,
Service: "agent",
Cmd: "Reconnect",
}
agent.Handle(cmd)
}
}
qanManager.Stop() // see Signal handler ^
time.Sleep(2 * time.Second) // wait for final replies and log entries
return stopErr
}
func (s *TestSuite) TestNotifications(t *C) {
mockConn := mock.NewNullMySQL()
mockConnFactory := &mock.ConnectionFactory{
Conn: mockConn,
}
m := monitor.NewMonitor(s.logger, mockConnFactory)
dsn := "fake:dsn@tcp(127.0.0.1:3306)/?parseTime=true"
/**
* Register new subscriber
*/
// Set initial uptime
mockConn.SetUptime(10)
subChan, err := m.Add(dsn)
t.Assert(err, IsNil)
/**
* MRMS should not send notification after first check for given dsn
*/
var notified bool
select {
case notified = <-subChan:
default:
}
t.Assert(notified, Equals, false, Commentf("MySQL was not restarted (first check of MySQL server), but MRMS notified subscribers"))
/**
* If MySQL was restarted then MRMS should notify subscriber
*/
// Imitate MySQL restart by returning 0s uptime (previously 10s)
mockConn.SetUptime(0)
m.Check()
notified = false
select {
case notified = <-subChan:
default:
}
t.Assert(notified, Equals, true, Commentf("MySQL was restarted, but MRMS didn't notify subscribers"))
/**
* If MySQL was not restarted then MRMS should not notify subscriber
*/
// 2s uptime is higher than previous 0s, this indicates MySQL was not restarted
mockConn.SetUptime(2)
m.Check()
notified = false
select {
case notified = <-subChan:
default:
}
t.Assert(notified, Equals, false, Commentf("MySQL was not restarted, but MRMS notified subscribers"))
/**
* Now let's imitate MySQL server restart and let's wait 3 seconds before next check.
* Since MySQL server was restarted and we waited 3s then uptime=3s
* which is higher than last registered uptime=2s
*
* However we expect in this test that this is properly detected as MySQL restart
* and the MRMS notifies subscribers
*/
waitTime := int64(3)
time.Sleep(time.Duration(waitTime) * time.Second)
mockConn.SetUptime(waitTime)
m.Check()
select {
case notified = <-subChan:
default:
}
t.Assert(notified, Equals, true, Commentf("MySQL was restarted (uptime overlaped last registered uptime), but MRMS didn't notify subscribers"))
/**
* After removing subscriber MRMS should not notify it anymore about MySQL restarts
*/
// Imitate MySQL restart by returning 0s uptime (previously 3s)
mockConn.SetUptime(0)
m.Remove(dsn, subChan)
m.Check()
notified = false
select {
case notified = <-subChan:
default:
}
t.Assert(notified, Equals, false, Commentf("Subscriber was removed but MRMS still notified it about MySQL restart"))
}