func ServeMetrics(steno *gosteno.Logger, l logger.Logger, conf *config.Config) {
store := connectToStore(l, conf)
messageBus := connectToMessageBus(l, conf)
acquireLock(l, conf, "metrics-server")
collectorRegistrar := collectorregistrar.NewCollectorRegistrar(messageBus, steno)
metricsServer := metricsserver.New(
collectorRegistrar,
steno,
metricsaccountant.New(store),
l,
store,
buildTimeProvider(l),
conf,
)
err := metricsServer.Start()
if err != nil {
l.Error("Failed to serve metrics", err)
}
l.Info("Serving Metrics")
select {}
}
func Analyze(l logger.Logger, conf *config.Config, poll bool) {
store := connectToStore(l, conf)
if poll {
l.Info("Starting Analyze Daemon...")
adapter := connectToStoreAdapter(l, conf, nil)
err := Daemonize("Analyzer", func() error {
return analyze(l, conf, store)
}, conf.AnalyzerPollingInterval(), conf.AnalyzerTimeout(), l, adapter)
if err != nil {
l.Error("Analyze Daemon Errored", err)
}
l.Info("Analyze Daemon is Down")
os.Exit(1)
} else {
err := analyze(l, conf, store)
if err != nil {
os.Exit(1)
} else {
os.Exit(0)
}
}
}
func connectToMessageBus(l logger.Logger, conf *config.Config) yagnats.NATSConn {
members := make([]string, len(conf.NATS))
for _, natsConf := range conf.NATS {
uri := url.URL{
Scheme: "nats",
User: url.UserPassword(natsConf.User, natsConf.Password),
Host: fmt.Sprintf("%s:%d", natsConf.Host, natsConf.Port),
}
members = append(members, uri.String())
}
natsClient, err := yagnats.Connect(members)
if err != nil {
l.Error("Failed to connect to the message bus", err)
os.Exit(1)
}
natsClient.AddReconnectedCB(func(conn *nats.Conn) {
l.Info(fmt.Sprintf("NATS Client Reconnected. Server URL: %s", conn.Opts.Url))
})
natsClient.AddClosedCB(func(conn *nats.Conn) {
err := errors.New(fmt.Sprintf("NATS Client Closed. nats.Conn: %+v", conn))
l.Error("NATS Closed", err)
os.Exit(1)
})
return natsClient
}
func FetchDesiredState(l logger.Logger, conf *config.Config, poll bool) {
store, _ := connectToStore(l, conf)
if poll {
l.Info("Starting Desired State Daemon...")
adapter, _ := connectToStoreAdapter(l, conf)
err := Daemonize("Fetcher", func() error {
return fetchDesiredState(l, conf, store)
}, conf.FetcherPollingInterval(), conf.FetcherTimeout(), l, adapter)
if err != nil {
l.Error("Desired State Daemon Errored", err)
}
l.Info("Desired State Daemon is Down")
os.Exit(1)
} else {
err := fetchDesiredState(l, conf, store)
if err != nil {
os.Exit(1)
} else {
os.Exit(0)
}
}
}
func Send(l logger.Logger, conf *config.Config, poll bool) {
messageBus := connectToMessageBus(l, conf)
store, _ := connectToStore(l, conf)
if poll {
l.Info("Starting Sender Daemon...")
adapter, _ := connectToStoreAdapter(l, conf)
err := Daemonize("Sender", func() error {
return send(l, conf, messageBus, store)
}, conf.SenderPollingInterval(), conf.SenderTimeout(), l, adapter)
if err != nil {
l.Error("Sender Daemon Errored", err)
}
l.Info("Sender Daemon is Down")
os.Exit(1)
} else {
err := send(l, conf, messageBus, store)
if err != nil {
os.Exit(1)
} else {
os.Exit(0)
}
}
}
func acquireLock(l logger.Logger, conf *config.Config, lockName string) {
adapter, _ := connectToStoreAdapter(l, conf)
l.Info("Acquiring lock for " + lockName)
lock := storeadapter.StoreNode{
Key: "/hm/locks/" + lockName,
TTL: 10,
}
status, _, err := adapter.MaintainNode(lock)
if err != nil {
l.Error("Failed to talk to lock store", err)
os.Exit(1)
}
lockAcquired := make(chan bool)
go func() {
for {
if <-status {
if lockAcquired != nil {
close(lockAcquired)
lockAcquired = nil
}
} else {
l.Error("Lost the lock", errors.New("Lost the lock"))
os.Exit(197)
}
}
}()
<-lockAcquired
l.Info("Acquired lock for " + lockName)
}
func Daemonize(
component string,
callback func() error,
period time.Duration,
timeout time.Duration,
logger logger.Logger,
adapter storeadapter.StoreAdapter,
) error {
logger.Info("Acquiring lock for " + component)
lostLockChannel, releaseLockChannel, err := adapter.GetAndMaintainLock(component, 10)
if err != nil {
logger.Info(fmt.Sprintf("Failed to acquire lock: %s", err))
return err
}
go func() {
<-lostLockChannel
logger.Error("Lost the lock", errors.New("Lock the lock"))
os.Exit(197)
}()
logger.Info("Acquired lock for " + component)
logger.Info(fmt.Sprintf("Running Daemon every %d seconds with a timeout of %d", int(period.Seconds()), int(timeout.Seconds())))
for {
afterChan := time.After(period)
timeoutChan := time.After(timeout)
errorChan := make(chan error, 1)
t := time.Now()
go func() {
errorChan <- callback()
}()
select {
case err := <-errorChan:
logger.Info("Daemonize Time", map[string]string{
"Component": component,
"Duration": fmt.Sprintf("%.4f", time.Since(t).Seconds()),
})
if err != nil {
logger.Error("Daemon returned an error. Continuining...", err)
}
case <-timeoutChan:
releaseLockChannel <- true
return errors.New("Daemon timed out. Aborting!")
}
<-afterChan
}
return nil
}
func StartEvacuator(l logger.Logger, conf *config.Config) {
messageBus := connectToMessageBus(l, conf)
store, _ := connectToStore(l, conf)
acquireLock(l, conf, "evacuator")
evacuator := evacuatorpackage.New(messageBus, store, buildTimeProvider(l), conf, l)
evacuator.Listen()
l.Info("Listening for DEA Evacuations")
select {}
}
func send(l logger.Logger, conf *config.Config, messageBus yagnats.NATSClient, store store.Store) error {
l.Info("Sending...")
sender := sender.New(store, metricsaccountant.New(store), conf, messageBus, buildTimeProvider(l), l)
err := sender.Send()
if err != nil {
l.Error("Sender failed with error", err)
return err
} else {
l.Info("Sender completed succesfully")
return nil
}
}
func analyze(l logger.Logger, conf *config.Config, store store.Store) error {
l.Info("Analyzing...")
analyzer := analyzer.New(store, buildTimeProvider(l), l, conf)
err := analyzer.Analyze()
if err != nil {
l.Error("Analyzer failed with error", err)
return err
} else {
l.Info("Analyzer completed succesfully")
return nil
}
}
func StartListeningForActual(l logger.Logger, c *cli.Context) {
conf := loadConfig(l, c)
messageBus := connectToMessageBus(l, conf)
store := connectToStore(l, conf)
listener := actualstatelistener.New(conf,
messageBus,
store,
timeprovider.NewTimeProvider(),
l)
listener.Start()
l.Info("Listening for Actual State", nil)
select {}
}
func acquireLock(l logger.Logger, conf *config.Config, lockName string) {
adapter, _ := connectToStoreAdapter(l, conf)
l.Info("Acquiring lock for " + lockName)
lostLockChannel, _, err := adapter.GetAndMaintainLock(lockName, 10)
if err != nil {
l.Error("Failed to talk to lock store", err)
os.Exit(1)
}
go func() {
<-lostLockChannel
l.Error("Lost the lock", errors.New("Lock the lock"))
os.Exit(197)
}()
l.Info("Acquired lock for " + lockName)
}
func StartListeningForActual(l logger.Logger, conf *config.Config) {
messageBus := connectToMessageBus(l, conf)
store, usageTracker := connectToStoreAndTrack(l, conf)
acquireLock(l, conf, "listener")
listener := actualstatelistener.New(conf,
messageBus,
store,
usageTracker,
metricsaccountant.New(store),
buildClock(l),
l,
)
listener.Start()
l.Info("Listening for Actual State")
select {}
}
func ServeAPI(l logger.Logger, conf *config.Config) {
store, _ := connectToStore(l, conf)
messageBus := connectToMessageBus(l, conf)
//no locking necessary for the api server. it's ok to have multiples of these running.
//NATS will distribute the requests and ensure that only one api-server handles a given request
//because we use a NATS queue.
apiServer := apiserver.New(
messageBus,
store,
buildTimeProvider(l),
l,
)
apiServer.Listen()
l.Info(fmt.Sprintf("Serving API over NATS (subject: app.state)"))
select {}
}
func FetchDesiredState(l logger.Logger, c *cli.Context) {
conf := loadConfig(l, c)
messageBus := connectToMessageBus(l, conf)
store := connectToStore(l, conf)
fetcher := desiredstatefetcher.New(conf,
messageBus,
store,
httpclient.NewHttpClient(),
timeprovider.NewTimeProvider(),
)
resultChan := make(chan desiredstatefetcher.DesiredStateFetcherResult, 1)
fetcher.Fetch(resultChan)
select {
case result := <-resultChan:
if result.Success {
l.Info("Success", map[string]string{"Number of Desired Apps Fetched": strconv.Itoa(result.NumResults)})
os.Exit(0)
} else {
l.Info(result.Message, map[string]string{"Error": result.Error.Error(), "Message": result.Message})
os.Exit(1)
}
case <-time.After(600 * time.Second):
l.Info("Timed out when fetching desired state", nil)
os.Exit(1)
}
}
func ServeAPI(l logger.Logger, conf *config.Config) {
store := connectToStore(l, conf)
apiHandler, err := handlers.New(l, store, buildTimeProvider(l))
if err != nil {
l.Error("initialize-handler.failed", err)
panic(err)
}
handler := handlers.BasicAuthWrap(apiHandler, conf.APIServerUsername, conf.APIServerPassword)
listenAddr := fmt.Sprintf("%s:%d", conf.APIServerAddress, conf.APIServerPort)
members := grouper.Members{
{"api", http_server.New(listenAddr, handler)},
}
group := grouper.NewOrdered(os.Interrupt, members)
monitor := ifrit.Invoke(sigmon.New(group))
l.Info("started")
l.Info(listenAddr)
err = <-monitor.Wait()
if err != nil {
l.Error("exited", err)
os.Exit(1)
}
l.Info("exited")
os.Exit(0)
}
func acquireLock(l logger.Logger, conf *config.Config, lockName string) {
adapter, _ := connectToStoreAdapter(l, conf)
l.Info("Acquiring lock for " + lockName)
lock := storeadapter.StoreNode{
Key: "/hm/locks/" + lockName,
TTL: 10,
}
lostLockChannel, _, err := adapter.MaintainNode(lock)
if err != nil {
l.Error("Failed to talk to lock store", err)
os.Exit(1)
}
go func() {
<-lostLockChannel
l.Error("Lost the lock", errors.New("Lock the lock"))
os.Exit(197)
}()
l.Info("Acquired lock for " + lockName)
}
func fetchDesiredState(l logger.Logger, conf *config.Config, store store.Store) error {
l.Info("Fetching Desired State")
fetcher := desiredstatefetcher.New(conf,
store,
metricsaccountant.New(store),
httpclient.NewHttpClient(conf.SkipSSLVerification, conf.FetcherNetworkTimeout()),
buildTimeProvider(l),
l,
)
resultChan := make(chan desiredstatefetcher.DesiredStateFetcherResult, 1)
fetcher.Fetch(resultChan)
result := <-resultChan
if result.Success {
l.Info("Success", map[string]string{"Number of Desired Apps Fetched": strconv.Itoa(result.NumResults)})
return nil
} else {
l.Error(result.Message, result.Error)
return result.Error
}
return nil
}
func shred(l logger.Logger, store store.Store) error {
l.Info("Shredding Store")
theShredder := shredder.New(store)
return theShredder.Shred()
}
func Daemonize(
component string,
callback func() error,
period time.Duration,
timeout time.Duration,
logger logger.Logger,
adapter storeadapter.StoreAdapter,
) error {
logger.Info("Acquiring lock for " + component)
lock := storeadapter.StoreNode{
Key: "/hm/locks/" + component,
TTL: 10,
}
status, releaseLockChannel, err := adapter.MaintainNode(lock)
if err != nil {
logger.Info(fmt.Sprintf("Failed to acquire lock: %s", err))
return err
}
lockAcquired := make(chan bool)
go func() {
for {
if <-status {
if lockAcquired != nil {
close(lockAcquired)
lockAcquired = nil
}
} else {
logger.Error("Lost the lock", errors.New("Lock the lock"))
os.Exit(197)
}
}
}()
<-lockAcquired
logger.Info("Acquired lock for " + component)
logger.Info(fmt.Sprintf("Running Daemon every %d seconds with a timeout of %d", int(period.Seconds()), int(timeout.Seconds())))
for {
afterChan := time.After(period)
timeoutChan := time.After(timeout)
errorChan := make(chan error, 1)
t := time.Now()
go func() {
errorChan <- callback()
}()
select {
case err := <-errorChan:
logger.Info("Daemonize Time", map[string]string{
"Component": component,
"Duration": fmt.Sprintf("%.4f", time.Since(t).Seconds()),
})
if err != nil {
logger.Error("Daemon returned an error. Continuining...", err)
}
case <-timeoutChan:
released := make(chan bool)
releaseLockChannel <- released
<-released
return errors.New("Daemon timed out. Aborting!")
}
<-afterChan
}
return nil
}