func (s *ManagerTestSuite) TestStartStopManager(t *C) {
/**
* mm is a proxy manager for monitors, so it's always running.
* It should implement the service manager interface anyway,
* but it doesn't actually start or stop. Its main work is done
* in Handle, starting and stopping monitors (tested later).
*/
mrm := mock.NewMrmsMonitor()
m := mm.NewManager(s.logger, s.factory, s.clock, s.spool, s.im, mrm)
if m == nil {
t.Fatal("Make new mm.Manager")
}
// It shouldn't have added a tickChan yet.
if len(s.clock.Added) != 0 {
t.Error("tickChan not added yet")
}
// First the API marshals an mm.Config.
config := &mm.Config{
ServiceInstance: proto.ServiceInstance{
Service: "mysql",
InstanceId: 1,
},
Collect: 1,
Report: 60,
// No monitor-specific config
}
err := pct.Basedir.WriteConfig("mm-mysql-1", config)
t.Assert(err, IsNil)
// The agent calls mm.Start().
err = m.Start()
t.Assert(err, IsNil)
// There is a monitor so there should be tickers.
if ok, diff := test.IsDeeply(s.clock.Added, []uint{1}); !ok {
test.Dump(s.clock.Added)
t.Errorf("Does not add tickChan, got %#v", diff)
}
// Its status should be "Running".
status := m.Status()
t.Check(status["mm"], Equals, "Running")
// Can't start mm twice.
err = m.Start()
t.Check(err, Not(Equals), "")
// Stopping should be idempotent.
err = m.Stop()
t.Check(err, IsNil)
err = m.Stop()
t.Check(err, IsNil)
status = m.Status()
t.Check(status["mm"], Equals, "Stopped")
}
func (s *ManagerTestSuite) TestGetConfig(t *C) {
m := mm.NewManager(s.logger, s.factory, s.clock, s.spool, s.im)
t.Assert(m, NotNil)
err := m.Start()
t.Assert(err, IsNil)
/**
* Start a mock MySQL monitor.
*/
mysqlMonitorConfig := &mysql.Config{
Config: mm.Config{
ServiceInstance: proto.ServiceInstance{
Service: "mysql",
InstanceId: 1,
},
Collect: 1,
Report: 60,
},
Status: map[string]string{
"threads_connected": "gauge",
"threads_running": "gauge",
},
}
mysqlData, err := json.Marshal(mysqlMonitorConfig)
t.Assert(err, IsNil)
cmd := &proto.Cmd{
User: "******",
Service: "mm",
Cmd: "StartService",
Data: mysqlData,
}
s.mysqlMonitor.SetConfig(mysqlMonitorConfig)
reply := m.Handle(cmd)
t.Assert(reply, NotNil)
t.Assert(reply.Error, Equals, "")
/**
* Start a mock system monitor.
*/
systemMonitorConfig := &system.Config{
Config: mm.Config{
ServiceInstance: proto.ServiceInstance{
Service: "server",
InstanceId: 1,
},
Collect: 10,
Report: 60,
},
}
systemData, err := json.Marshal(systemMonitorConfig)
t.Assert(err, IsNil)
cmd = &proto.Cmd{
User: "******",
Service: "mm",
Cmd: "StartService",
Data: systemData,
}
s.systemMonitor.SetConfig(systemMonitorConfig)
reply = m.Handle(cmd)
t.Assert(reply, NotNil)
t.Assert(reply.Error, Equals, "")
/**
* GetConfig from mm which should return all monitors' configs.
*/
cmd = &proto.Cmd{
Cmd: "GetConfig",
Service: "mm",
}
reply = m.Handle(cmd)
t.Assert(reply, NotNil)
t.Assert(reply.Error, Equals, "")
t.Assert(reply.Data, NotNil)
gotConfig := []proto.AgentConfig{}
if err := json.Unmarshal(reply.Data, &gotConfig); err != nil {
t.Fatal(err)
}
expectConfig := []proto.AgentConfig{
{
InternalService: "mm",
ExternalService: proto.ServiceInstance{
Service: "mysql",
InstanceId: 1,
},
Config: string(mysqlData),
Running: true,
},
{
InternalService: "mm",
ExternalService: proto.ServiceInstance{
Service: "server",
InstanceId: 1,
},
Config: string(systemData),
Running: true,
},
}
if same, diff := test.IsDeeply(gotConfig, expectConfig); !same {
test.Dump(gotConfig)
t.Error(diff)
}
}
/**
* Tests:
* - starting monitor
* - stopping monitor
* - starting monitor again (restarting monitor)
* - sneaked in:) unknown cmd test
*/
func (s *ManagerTestSuite) TestRestartMonitor(t *C) {
// Create and start mm, no monitors yet.
m := mm.NewManager(s.logger, s.factory, s.clock, s.spool, s.im)
t.Assert(m, NotNil)
err := m.Start()
t.Assert(err, IsNil)
// Start a monitor by sending StartService + monitor config.
// This is the config in test/mm/config/mm-mysql-1.conf.
mmConfig := &mysql.Config{
Config: mm.Config{
ServiceInstance: proto.ServiceInstance{
Service: "mysql",
InstanceId: 1,
},
Collect: 1,
Report: 60,
},
Status: map[string]string{
"threads_connected": "gauge",
"threads_running": "gauge",
},
}
mmConfigData, err := json.Marshal(mmConfig)
t.Assert(err, IsNil)
// If this were a real monitor, it would decode and set its own config.
// The mock monitor doesn't have any real config type, so we set it manually.
s.mysqlMonitor.SetConfig(mmConfig)
// The agent calls mm.Handle() with the cmd (for logging and status) and the config data.
cmd := &proto.Cmd{
User: "******",
Service: "mm",
Cmd: "StartService",
Data: mmConfigData,
}
reply := m.Handle(cmd)
t.Assert(reply, NotNil)
t.Check(reply.Error, Equals, "")
// The monitor should be running. The mock monitor returns "Running" if
// Start() has been called; else it returns "Stopped".
status := m.Status()
t.Check(status["monitor"], Equals, "Running")
// There should be a 1s collect ticker for the monitor.
if ok, diff := test.IsDeeply(s.clock.Added, []uint{1}); !ok {
t.Errorf("Make 1s ticker for collect interval\n%s", diff)
}
// After starting a monitor, mm should write its config to the dir
// it learned when mm.LoadConfig() was called. Next time agent starts,
// it will have mm start the monitor with this config.
data, err := ioutil.ReadFile(s.configDir + "/mm-mysql-1.conf")
t.Check(err, IsNil)
gotConfig := &mysql.Config{}
err = json.Unmarshal(data, gotConfig)
t.Check(err, IsNil)
if same, diff := test.IsDeeply(gotConfig, mmConfig); !same {
test.Dump(gotConfig)
t.Error(diff)
}
/**
* Stop the monitor.
*/
cmd = &proto.Cmd{
User: "******",
Service: "mm",
Cmd: "StopService",
Data: mmConfigData,
}
// Handles StopService without error.
reply = m.Handle(cmd)
t.Assert(reply, NotNil)
t.Check(reply.Error, Equals, "")
// Stop a monitor removes it from the managers list of monitors.
// So it's no longer present in a status request.
status = m.Status()
t.Check(status["monitor"], Equals, "")
// After stopping the monitor, the manager should remove its tickChan.
if len(s.clock.Removed) != 1 {
t.Error("Remove's monitor's tickChan from clock")
}
// After stopping a monitor, mm should remove its config file so agent
// doesn't start it on restart.
file := s.configDir + "/mm-mysql-1.conf"
if pct.FileExists(file) {
t.Error("Stopping monitor removes its config; ", file, " exists")
}
/**
* Start the monitor again (restarting monitor).
*/
cmd = &proto.Cmd{
User: "******",
Service: "mm",
Cmd: "StartService",
Data: mmConfigData,
}
// If this were a real monitor, it would decode and set its own config.
// The mock monitor doesn't have any real config type, so we set it manually.
s.mysqlMonitor.SetConfig(mmConfig)
// The agent calls mm.Handle() with the cmd (for logging and status) and the config data.
reply = m.Handle(cmd)
t.Assert(reply, NotNil)
t.Check(reply.Error, Equals, "")
// The monitor should be running. The mock monitor returns "Running" if
// Start() has been called; else it returns "Stopped".
status = m.Status()
t.Check(status["monitor"], Equals, "Running")
// There should be a 1s collect ticker for the monitor.
// (Actually two in s.clock.Added, as this is mock and we started monitor twice)
if ok, diff := test.IsDeeply(s.clock.Added, []uint{1, 1}); !ok {
t.Errorf("Make 1s ticker for collect interval\n%s", diff)
}
// After starting a monitor, mm should write its config to the dir
// it learned when mm.LoadConfig() was called. Next time agent starts,
// it will have mm start the monitor with this config.
data, err = ioutil.ReadFile(s.configDir + "/mm-mysql-1.conf")
t.Check(err, IsNil)
gotConfig = &mysql.Config{}
err = json.Unmarshal(data, gotConfig)
t.Check(err, IsNil)
if same, diff := test.IsDeeply(gotConfig, mmConfig); !same {
t.Logf("%+v", gotConfig)
t.Error(diff)
}
/**
* While we're all setup and working, let's sneak in an unknown cmd test.
*/
cmd = &proto.Cmd{
User: "******",
Service: "mm",
Cmd: "Pontificate",
Data: mmConfigData,
}
// Unknown cmd causes error.
reply = m.Handle(cmd)
t.Assert(reply, NotNil)
t.Check(reply.Error, Not(Equals), "")
}
func run() error {
version := fmt.Sprintf("percona-agent %s rev %s", agent.VERSION, 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.
*/
if flagPing {
t0 := time.Now()
code, err := pct.Ping(agentConfig.ApiHostname, agentConfig.ApiKey)
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
*/
if flagPidFile != "" {
pidFile := pct.NewPidFile()
if err := pidFile.Set(flagPidFile); err != nil {
golog.Fatalln(err)
}
defer pidFile.Remove()
}
/**
* REST API
*/
api, err := ConnectAPI(agentConfig)
if err != nil {
golog.Fatal(err)
}
/**
* 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")
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)
}
/**
* Instance manager
*/
itManager := instance.NewManager(
pct.NewLogger(logChan, "instance-manager"),
pct.Basedir.Dir("config"),
api,
)
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")
if err != nil {
golog.Fatalln(err)
}
dataManager := data.NewManager(
pct.NewLogger(logChan, "data"),
pct.Basedir.Dir("data"),
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()),
clock,
dataManager.Spooler(),
itManager.Repo(),
)
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 Analytics
*/
qanManager := qan.NewManager(
pct.NewLogger(logChan, "qan"),
&mysql.RealConnectionFactory{},
clock,
qan.NewFileIntervalIterFactory(logChan),
qan.NewSlowLogWorkerFactory(logChan),
dataManager.Spooler(),
itManager.Repo(),
)
if err := qanManager.Start(); err != nil {
return fmt.Errorf("Error starting qan 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")
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,
"sysconfig": sysconfigManager,
}
agent := agent.NewAgent(
agentConfig,
pct.NewLogger(logChan, "agent"),
api,
cmdClient,
services,
)
/**
* Run agent, wait for it to stop or signal.
*/
go func() {
stopChan <- agent.Run()
}()
stopErr := <-stopChan // agent or signal
golog.Println("Agent stopped, shutting down...")
qanManager.Stop() // see Signal handler ^
time.Sleep(2 * time.Second) // wait for final replies and log entries
return stopErr
}
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
}