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/
main.go
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/
main.go
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package main
import (
"code.cloudfoundry.org/app-autoscaler/src/autoscaler/db"
"code.cloudfoundry.org/app-autoscaler/src/autoscaler/db/sqldb"
"code.cloudfoundry.org/app-autoscaler/src/autoscaler/eventgenerator/aggregator"
"code.cloudfoundry.org/app-autoscaler/src/autoscaler/eventgenerator/config"
"code.cloudfoundry.org/app-autoscaler/src/autoscaler/eventgenerator/generator"
"code.cloudfoundry.org/app-autoscaler/src/autoscaler/eventgenerator/server"
"code.cloudfoundry.org/app-autoscaler/src/autoscaler/healthendpoint"
"code.cloudfoundry.org/app-autoscaler/src/autoscaler/helpers"
"code.cloudfoundry.org/app-autoscaler/src/autoscaler/models"
circuit "github.com/rubyist/circuitbreaker"
"flag"
"fmt"
"io/ioutil"
"net/http"
"os"
"code.cloudfoundry.org/cfhttp"
"code.cloudfoundry.org/clock"
"code.cloudfoundry.org/lager"
"github.com/prometheus/client_golang/prometheus"
"github.com/tedsuo/ifrit"
"github.com/tedsuo/ifrit/grouper"
"github.com/tedsuo/ifrit/sigmon"
)
func main() {
var path string
flag.StringVar(&path, "c", "", "config file")
flag.Parse()
if path == "" {
fmt.Fprintln(os.Stdout, "missing config file\nUsage:use '-c' option to specify the config file path")
os.Exit(1)
}
conf, err := loadConfig(path)
if err != nil {
fmt.Fprintf(os.Stdout, "%s\n", err.Error())
os.Exit(1)
}
cfhttp.Initialize(conf.HttpClientTimeout)
logger := helpers.InitLoggerFromConfig(&conf.Logging, "eventgenerator")
egClock := clock.NewClock()
appMetricDB, err := sqldb.NewAppMetricSQLDB(conf.DB.AppMetricDB, logger.Session("appMetric-db"))
if err != nil {
logger.Error("failed to connect app-metric database", err, lager.Data{"dbConfig": conf.DB.AppMetricDB})
os.Exit(1)
}
defer appMetricDB.Close()
var policyDB db.PolicyDB
policyDB, err = sqldb.NewPolicySQLDB(conf.DB.PolicyDB, logger.Session("policy-db"))
if err != nil {
logger.Error("failed to connect policy database", err, lager.Data{"dbConfig": conf.DB.PolicyDB})
os.Exit(1)
}
defer policyDB.Close()
httpStatusCollector := healthendpoint.NewHTTPStatusCollector("autoscaler", "eventgenerator")
promRegistry := prometheus.NewRegistry()
healthendpoint.RegisterCollectors(promRegistry, []prometheus.Collector{
healthendpoint.NewDatabaseStatusCollector("autoscaler", "eventgenerator", "appMetricDB", appMetricDB),
healthendpoint.NewDatabaseStatusCollector("autoscaler", "eventgenerator", "policyDB", policyDB),
httpStatusCollector,
}, true, logger.Session("eventgenerator-prometheus"))
appManager := aggregator.NewAppManager(logger, egClock, conf.Aggregator.PolicyPollerInterval,
len(conf.Server.NodeAddrs), conf.Server.NodeIndex, conf.Aggregator.MetricCacheSizePerApp, policyDB, appMetricDB)
triggersChan := make(chan []*models.Trigger, conf.Evaluator.TriggerArrayChannelSize)
evaluationManager, err := generator.NewAppEvaluationManager(logger, conf.Evaluator.EvaluationManagerInterval, egClock,
triggersChan, appManager.GetPolicies, conf.CircuitBreaker)
if err != nil {
logger.Error("failed to create Evaluation Manager", err)
os.Exit(1)
}
evaluators, err := createEvaluators(logger, conf, triggersChan, appMetricDB, appManager.QueryAppMetrics, evaluationManager.GetBreaker, evaluationManager.SetCoolDownExpired)
if err != nil {
logger.Error("failed to create Evaluators", err)
os.Exit(1)
}
appMonitorsChan := make(chan *models.AppMonitor, conf.Aggregator.AppMonitorChannelSize)
appMetricChan := make(chan *models.AppMetric, conf.Aggregator.AppMetricChannelSize)
metricPollers, err := createMetricPollers(logger, conf, appMonitorsChan, appMetricChan)
if err != nil {
logger.Error("failed to create MetricPoller", err)
os.Exit(1)
}
aggregator, err := aggregator.NewAggregator(logger, egClock, conf.Aggregator.AggregatorExecuteInterval, conf.Aggregator.SaveInterval,
appMonitorsChan, appManager.GetPolicies, appManager.SaveMetricToCache, conf.DefaultStatWindowSecs, appMetricChan, appMetricDB)
if err != nil {
logger.Error("failed to create Aggregator", err)
os.Exit(1)
}
eventGenerator := ifrit.RunFunc(func(signals <-chan os.Signal, ready chan<- struct{}) error {
appManager.Start()
for _, evaluator := range evaluators {
evaluator.Start()
}
evaluationManager.Start()
for _, metricPoller := range metricPollers {
metricPoller.Start()
}
aggregator.Start()
close(ready)
<-signals
aggregator.Stop()
evaluationManager.Stop()
appManager.Stop()
return nil
})
httpServer, err := server.NewServer(logger.Session("http_server"), conf, appManager.QueryAppMetrics, httpStatusCollector)
if err != nil {
logger.Error("failed to create http server", err)
os.Exit(1)
}
healthServer, err := healthendpoint.NewServerWithBasicAuth(logger.Session("health-server"), conf.Health.Port, promRegistry, conf.Health.HealthCheckUsername, conf.Health.HealthCheckPassword, conf.Health.HealthCheckUsernameHash, conf.Health.HealthCheckPasswordHash)
if err != nil {
logger.Error("failed to create health server", err)
os.Exit(1)
}
members := grouper.Members{
{"eventGenerator", eventGenerator},
{"http_server", httpServer},
{"health_server", healthServer},
}
monitor := ifrit.Invoke(sigmon.New(grouper.NewOrdered(os.Interrupt, members)))
logger.Info("started")
err = <-monitor.Wait()
if err != nil {
logger.Error("exited-with-failure", err)
os.Exit(1)
}
logger.Info("exited")
}
func loadConfig(path string) (*config.Config, error) {
configFile, err := os.Open(path)
if err != nil {
return nil, fmt.Errorf("failed to open config file %q: %w", path, err)
}
configFileBytes, err := ioutil.ReadAll(configFile)
configFile.Close()
if err != nil {
return nil, fmt.Errorf("failed to read data from config file %q: %w", path, err)
}
conf, err := config.LoadConfig(configFileBytes)
if err != nil {
return nil, fmt.Errorf("failed to parse config file %q: %w", path, err)
}
err = conf.Validate()
if err != nil {
return nil, fmt.Errorf("failed to validate configuration: %w", err)
}
return conf, nil
}
func createEvaluators(logger lager.Logger, conf *config.Config, triggersChan chan []*models.Trigger,
database db.AppMetricDB, queryMetrics aggregator.QueryAppMetricsFunc, getBreaker func(string) *circuit.Breaker, setCoolDownExpired func(string, int64)) ([]*generator.Evaluator, error) {
count := conf.Evaluator.EvaluatorCount
client, err := helpers.CreateHTTPClient(&conf.ScalingEngine.TLSClientCerts)
if err != nil {
logger.Error("failed to create http client for ScalingEngine", err, lager.Data{"scalingengineTLS": conf.ScalingEngine.TLSClientCerts})
os.Exit(1)
}
evaluators := make([]*generator.Evaluator, count)
for i := 0; i < count; i++ {
evaluators[i] = generator.NewEvaluator(logger, client, conf.ScalingEngine.ScalingEngineURL, triggersChan,
conf.DefaultBreachDurationSecs, queryMetrics, getBreaker, setCoolDownExpired)
}
return evaluators, nil
}
func createMetricPollers(logger lager.Logger, conf *config.Config, appChan chan *models.AppMonitor, appMetricChan chan *models.AppMetric) ([]*aggregator.MetricPoller, error) {
client, err := helpers.CreateHTTPClient(&conf.MetricCollector.TLSClientCerts)
if err != nil {
logger.Error("failed to create http client for MetricCollector", err, lager.Data{"metriccollectorTLS": conf.MetricCollector.TLSClientCerts})
os.Exit(1)
}
count := conf.Aggregator.MetricPollerCount
client.Transport.(*http.Transport).MaxIdleConnsPerHost = count
pollers := make([]*aggregator.MetricPoller, count)
for i := 0; i < count; i++ {
pollers[i] = aggregator.NewMetricPoller(logger, conf.MetricCollector.MetricCollectorURL, appChan, client, appMetricChan)
}
return pollers, nil
}