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main.go
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main.go
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/*
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
https://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 (
"errors"
"flag"
"fmt"
"os"
goruntime "runtime"
"strings"
vaultsecret "github.com/nmaupu/vault-secret/controllers"
appVersion "github.com/nmaupu/vault-secret/version"
"k8s.io/apimachinery/pkg/runtime"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/cache"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/log/zap"
"sigs.k8s.io/controller-runtime/pkg/manager"
maupuv1beta1 "github.com/nmaupu/vault-secret/api/v1beta1"
// +kubebuilder:scaffold:imports
)
const (
// WatchMultiNamespacesEnvVar godoc
WatchMultiNamespacesEnvVar = "WATCH_MULTINAMESPACES"
)
var (
scheme = runtime.NewScheme()
setupLog = ctrl.Log.WithName("setup")
)
var log = logf.Log.WithName("cmd")
// stringArrayFlag is a way to provide a flag multiple times as command line argument
type stringArrayFlag []string
func (i *stringArrayFlag) String() string {
return "stringArrayFlag"
}
func (i *stringArrayFlag) Set(v string) error {
*i = append(*i, v)
return nil
}
func printVersion() {
log.Info(fmt.Sprintf("Vault-secret operator version: %v", appVersion.Version))
log.Info(fmt.Sprintf("Go Version: %s", goruntime.Version()))
log.Info(fmt.Sprintf("Go OS/Arch: %s/%s", goruntime.GOOS, goruntime.GOARCH))
}
func init() {
utilruntime.Must(clientgoscheme.AddToScheme(scheme))
utilruntime.Must(maupuv1beta1.AddToScheme(scheme))
// +kubebuilder:scaffold:scheme
}
func main() {
var metricsAddr string
var enableLeaderElection bool
var labels stringArrayFlag
flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
flag.BoolVar(&enableLeaderElection, "enable-leader-election", false,
"Enable leader election for controller manager. "+
"Enabling this will ensure there is only one active controller manager.")
flag.Var(&labels, "filter-label", "Process only VaultSecret custom resources containing the given labels")
flag.Parse()
ctrl.SetLogger(zap.New(zap.UseDevMode(true)))
// Log current version information
printVersion()
// Labels filtering
var labelsFilter = make(map[string]string)
for _, v := range labels {
toks := strings.Split(v, "=")
if len(toks) != 2 {
log.Error(errors.New("Incorrect label filter"), v)
} else {
key := toks[0]
val := toks[1]
log.Info(fmt.Sprintf("Adding label filter: %s = %s", key, val))
labelsFilter[key] = val
}
}
// Get namespace to watch from WATCH_NAMESPACE environment variable
// If set, use it. Otherwise, try WATCH_MULTINAMESPACES environment variable
// If not set, use cluster wide configuration
namespace, found := os.LookupEnv("WATCH_NAMESPACE")
if !found {
// WATCH_NAMESPACE not found
log.Info("WATCH_NAMESPACE env var not set")
}
multiNamespaces, err := getWatchMultiNamespaces()
if err != nil {
// WATCH_MULTINAMESPACES not found
log.Info(fmt.Sprintf("%s not set", WatchMultiNamespacesEnvVar))
}
if namespace == "" && len(multiNamespaces) == 0 {
log.Info(fmt.Sprintf("WATCH_NAMESPACE and %s are not set, operator is cluster wide", WatchMultiNamespacesEnvVar))
}
mgrOptions := manager.Options{
Scheme: scheme,
MetricsBindAddress: metricsAddr,
Port: 9443,
LeaderElection: enableLeaderElection,
LeaderElectionID: "cd2da758.maupu.org",
Namespace: namespace,
}
if len(multiNamespaces) > 0 {
log.Info(fmt.Sprintf("Using WATCH_MULTINAMESPACES value = %+v", multiNamespaces))
mgrOptions.NewCache = cache.MultiNamespacedCacheBuilder(multiNamespaces)
mgrOptions.Namespace = ""
} else {
log.Info(fmt.Sprintf("Using WATCH_NAMESPACE value = \"%s\"", namespace))
}
// Creating the manager
mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), mgrOptions)
if err != nil {
setupLog.Error(err, "unable to start manager")
os.Exit(1)
}
if err = (&vaultsecret.VaultSecretReconciler{
Client: mgr.GetClient(),
Log: ctrl.Log.WithName("controllers").WithName("VaultSecret"),
Scheme: mgr.GetScheme(),
LabelsFilter: labelsFilter,
}).SetupWithManager(mgr); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "VaultSecret")
os.Exit(1)
}
// +kubebuilder:scaffold:builder
setupLog.Info("starting manager")
if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
setupLog.Error(err, "problem running manager")
os.Exit(1)
}
}
// GetWatchMultiNamespaces returns the namespaces list the operator should be watching for changes
// Very similar to WATCH_NAMESPACE but for multiple namespaces
func getWatchMultiNamespaces() ([]string, error) {
var namespaces []string
ns, found := os.LookupEnv(WatchMultiNamespacesEnvVar)
if !found {
return namespaces, fmt.Errorf("%s env var is not set", WatchMultiNamespacesEnvVar)
}
namespaces = strings.Split(ns, ",")
return namespaces, nil
}