/
main.go
189 lines (161 loc) · 5.26 KB
/
main.go
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package main
import (
"context"
"errors"
"fmt"
"net/http"
"os"
"os/signal"
"strconv"
"syscall"
"time"
"github.com/go-logr/zerologr"
"github.com/rs/zerolog/log"
"golang.org/x/sync/errgroup"
"k8s.io/apimachinery/pkg/runtime"
"sigs.k8s.io/controller-runtime/pkg/event"
crlog "sigs.k8s.io/controller-runtime/pkg/log"
"github.com/berops/claudie/internal/envs"
"github.com/berops/claudie/internal/healthcheck"
"github.com/berops/claudie/internal/utils"
"github.com/berops/claudie/services/claudie-operator/pkg/controller"
"github.com/berops/claudie/services/claudie-operator/server/adapters/inbound/grpc"
outboundAdapters "github.com/berops/claudie/services/claudie-operator/server/adapters/outbound"
"github.com/berops/claudie/services/claudie-operator/server/domain/usecases"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/healthz"
)
const (
// healthcheckPort is the port on which Kubernetes readiness and liveness probes send request
// for performing health checks.
healthcheckPort = ":50000"
healthCheckInterval = 10 * time.Second
)
var (
// port is the port number that the server will serve. It will be defaulted to 9443 if unspecified.
portStr string
// certDir is the directory that contains the server key and certificate. The server key and certificate.
certDir string
// path under which the validation webhook will serve
webhookPath string
)
func main() {
// lookup environment variables
portStr = utils.GetEnvDefault("WEBHOOK_TLS_PORT", "9443")
certDir = utils.GetEnvDefault("WEBHOOK_CERT_DIR", "./tls")
webhookPath = utils.GetEnvDefault("WEBHOOK_PATH", "/validate-manifest")
utils.InitLog("claudie-operator")
if err := run(); err != nil {
log.Fatal().Msg(err.Error())
}
}
func run() error {
contextBoxConnector := outboundAdapters.NewContextBoxConnector(envs.ContextBoxURL)
err := contextBoxConnector.Connect()
if err != nil {
return err
}
autoscalerChan := make(chan event.GenericEvent)
usecaseContext, usecaseCancel := context.WithCancel(context.Background())
usecases := &usecases.Usecases{
ContextBox: contextBoxConnector,
Context: usecaseContext,
SaveAutoscalerEvent: autoscalerChan,
}
grpcAdapter := &grpc.GrpcAdapter{}
grpcAdapter.Init(usecases)
errGroup, errGroupContext := errgroup.WithContext(context.Background())
// Server goroutine
errGroup.Go(func() error {
return grpcAdapter.Serve()
})
// Interrupt signal listener
errGroup.Go(func() error {
shutdownSignalChan := make(chan os.Signal, 1)
signal.Notify(shutdownSignalChan, os.Interrupt, syscall.SIGTERM)
defer signal.Stop(shutdownSignalChan)
var err error
// Wait for either the received signal or
// check if an error occurred in other go-routines.
select {
case <-errGroupContext.Done():
err = errGroupContext.Err()
case sig := <-shutdownSignalChan:
log.Info().Msgf("Received program shutdown signal %v", sig)
err = errors.New("program interruption signal")
}
// Disconnect from context-box
if err := contextBoxConnector.Disconnect(); err != nil {
log.Err(err).Msgf("Failed to gracefully shutdown ContextBoxConnector")
}
// Cancel context for usecases functions to terminate manager.
defer usecaseCancel()
defer signal.Stop(shutdownSignalChan)
defer close(autoscalerChan)
// Perform graceful shutdown
log.Info().Msg("Gracefully shutting down GrpcAdapter")
grpcAdapter.Stop()
// Sometimes when the container terminates gRPC logs the following message:
// rpc error: code = Unknown desc = Error: No such container: hash of the container...
// It does not affect anything as everything will get terminated gracefully
// this time.Sleep fixes it so that the message won't be logged.
time.Sleep(1 * time.Second)
return err
})
// Setup inputManifest controller
crlog.SetLogger(zerologr.New(&log.Logger))
logger := crlog.Log
scheme := runtime.NewScheme()
mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
Scheme: scheme,
HealthProbeBindAddress: healthcheckPort,
Logger: logger,
})
if err != nil {
return err
}
// Register inputManifest controller
if err := controller.New(
mgr.GetClient(),
mgr.GetScheme(),
logger,
mgr.GetEventRecorderFor("InputManifest"),
*usecases,
).SetupWithManager(mgr); err != nil {
return err
}
// convert string from env to int
port, err := strconv.Atoi(portStr)
if err != nil {
return err
}
// Register inputManifest validation webhook
if err := mgr.Add(controller.NewWebhook(
mgr.GetScheme(),
port,
certDir,
webhookPath,
logger,
)); err != nil {
return err
}
hc := healthcheck.NewHealthCheck(&log.Logger, healthCheckInterval, []healthcheck.HealthCheck{{
Ping: usecases.ContextBox.PerformHealthCheck,
ServiceName: "contextbox",
}})
// Register a healthcheck and readiness endpoint, with path and /healthz
// https://github.com/kubernetes-sigs/controller-runtime/issues/2127
if err := mgr.AddHealthzCheck("health", func(req *http.Request) error {
if err := hc.CheckForFailures(); err != nil {
return err
}
return healthz.Ping(req)
}); err != nil {
return err
}
// Starting manager with inputManifest controller and validation webhook
if err := mgr.Start(usecaseContext); err != nil {
return err
}
return fmt.Errorf("program interrupt signal")
}