forked from grafeas/kritis
/
main.go
179 lines (160 loc) · 5.08 KB
/
main.go
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/*
Copyright 2018 Google LLC
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"context"
"crypto/tls"
"flag"
"fmt"
"net/http"
_ "net/http/pprof"
"time"
"github.com/golang/glog"
"github.com/grafeas/kritis/cmd/kritis/version"
"github.com/grafeas/kritis/pkg/kritis/admission"
"github.com/grafeas/kritis/pkg/kritis/constants"
"github.com/grafeas/kritis/pkg/kritis/crd/kritisconfig"
"github.com/grafeas/kritis/pkg/kritis/cron"
kubernetesutil "github.com/grafeas/kritis/pkg/kritis/kubernetes"
"github.com/grafeas/kritis/pkg/kritis/metadata/grafeas"
"github.com/pkg/errors"
"k8s.io/client-go/kubernetes"
_ "k8s.io/client-go/plugin/pkg/client/auth"
)
const (
// Default values for the configuration
DefaultMetadataBackend = constants.ContainerAnalysisMetadata
DefaultCronInterval = "1h"
DefaultServerAddr = ":443"
)
var (
tlsCertFile string
tlsKeyFile string
grafeasCerts string
showVersion bool
runCron bool
)
func main() {
flag.StringVar(&tlsCertFile, "tls-cert-file", "/var/tls/tls.crt", "TLS certificate file.")
flag.StringVar(&tlsKeyFile, "tls-key-file", "/var/tls/tls.key", "TLS key file.")
flag.StringVar(&grafeasCerts, "grafeas-certs", "/etc/config/grafeascerts.yaml", "Grafeas certificates.")
flag.BoolVar(&showVersion, "version", false, "kritis-server version")
flag.BoolVar(&runCron, "run-cron", false, "Run cron job in foreground.")
flag.Parse()
if err := flag.Set("logtostderr", "true"); err != nil {
glog.Fatal(errors.Wrap(err, "unable to set logtostderr"))
}
if showVersion {
fmt.Println(version.Commit)
return
}
// KritisConfig is a cluster-wide CRD.
kritisConfigs, err := kritisconfig.KritisConfigs()
if err != nil {
errMsg := fmt.Sprintf("error getting kritis config: %v", err)
glog.Errorf(errMsg)
return
}
// Set the defaults that will be used if no KritisConfig is defined
metadataBackend := DefaultMetadataBackend
cronInterval := DefaultCronInterval
serverAddr := DefaultServerAddr
config := &admission.Config{
Metadata: metadataBackend,
}
if len(kritisConfigs) == 0 {
glog.Infof("No KritisConfigs found in any namespace, will assume the defaults")
} else if len(kritisConfigs) > 1 {
glog.Errorf("More than 1 KritisConfig found, expected to have only 1 in the cluster")
return
} else {
kritisConf := kritisConfigs[0]
// TODO(https://github.com/grafeas/kritis/issues/304): Use CRD validation instead
if kritisConf.Spec.MetadataBackend != "" {
config.Metadata = kritisConf.Spec.MetadataBackend
}
if kritisConf.Spec.CronInterval != "" {
cronInterval = kritisConf.Spec.CronInterval
}
if kritisConf.Spec.ServerAddr != "" {
serverAddr = kritisConf.Spec.ServerAddr
}
if config.Metadata == constants.GrafeasMetadata {
config.Grafeas = kritisConf.Spec.Grafeas
if err := grafeas.ValidateConfig(config.Grafeas); err != nil {
glog.Fatal(err)
}
certs, err := grafeas.LoadConfig(grafeasCerts)
if err != nil {
glog.Fatal(err)
}
config.Certs = certs
}
}
// TODO: (tejaldesai) This is getting complicated. Use CLI Library.
if runCron {
cronConfig, err := getCronConfig(config)
if err != nil {
glog.Fatalf("Could not run cron job in foreground: %s", err)
}
if err := cron.RunInForeground(*cronConfig); err != nil {
glog.Fatalf("Error Checking pods: %s", err)
}
return
}
// Kick off background cron job.
if err := StartCronJob(config, cronInterval); err != nil {
glog.Fatal(errors.Wrap(err, "starting background job"))
}
// Start the Kritis Server.
glog.Infof("Running the server, address: %s", serverAddr)
http.HandleFunc("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
admission.ReviewHandler(w, r, config)
}))
httpsServer := NewServer(serverAddr)
glog.Fatal(httpsServer.ListenAndServeTLS(tlsCertFile, tlsKeyFile))
}
func NewServer(addr string) *http.Server {
return &http.Server{
Addr: addr,
TLSConfig: &tls.Config{
// TODO: Change this to tls.RequireAndVerifyClientCert
ClientAuth: tls.NoClientCert,
},
}
}
// StartCron starts the cron.StartCronJob in background.
func StartCronJob(config *admission.Config, cronInterval string) error {
d, err := time.ParseDuration(cronInterval)
if err != nil {
return err
}
cronConfig, err := getCronConfig(config)
if err != nil {
return err
}
go cron.Start(context.Background(), *cronConfig, d)
return nil
}
func getCronConfig(config *admission.Config) (*cron.Config, error) {
ki, err := kubernetesutil.GetClientset()
if err != nil {
return nil, err
}
kcs := ki.(*kubernetes.Clientset)
client, err := admission.MetadataClient(config)
if err != nil {
return nil, err
}
return cron.NewCronConfig(kcs, client), nil
}