/
simulator.go
168 lines (145 loc) · 4.54 KB
/
simulator.go
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package simulator
import (
"context"
"fmt"
"strings"
"github.com/rancher/fleet/modules/agent/pkg/agent"
"github.com/rancher/fleet/modules/agent/pkg/register"
"github.com/rancher/fleet/pkg/config"
"github.com/rancher/wrangler/pkg/kubeconfig"
"github.com/rancher/wrangler/pkg/name"
"github.com/rancher/wrangler/pkg/ratelimit"
"github.com/sirupsen/logrus"
"golang.org/x/sync/errgroup"
"golang.org/x/sync/semaphore"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
var (
semMax = int64(50)
sem = semaphore.NewWeighted(semMax)
)
func Simulate(ctx context.Context, count int, kubeConfig, namespace, defaultNamespace string, opts agent.Options) error {
logrus.Infof("Starting %d simulators", count)
startAfter := make(chan struct{})
opts.StartAfter = startAfter
eg, ctx := errgroup.WithContext(ctx)
for i := 0; i < count; i++ {
i := i
if err := sem.Acquire(ctx, 1); err != nil {
close(startAfter)
return err
}
logrus.Infof("STARING %s%05d", namespace, i)
eg.Go(func() error {
defer sem.Release(1)
if err := simulateAgent(ctx, i, kubeConfig, namespace, defaultNamespace, opts); err != nil {
logrus.Errorf("Failed to start simulator %s: %v", namespace, err)
return err
}
return nil
})
}
if err := sem.Acquire(ctx, semMax); err != nil {
close(startAfter)
return err
}
close(startAfter)
eg.Go(func() error {
// wait forever unless one of the simulators dies
<-ctx.Done()
return ctx.Err()
})
return eg.Wait()
}
func simulateAgent(ctx context.Context, i int, kubeConfig, namespace, defaultNamespace string, opts agent.Options) error {
simNamespace := fmt.Sprintf("%s%05d", namespace, i)
simDefaultNamespace := fmt.Sprintf("%s%05d", defaultNamespace, i)
clusterID, err := setupNamespace(ctx, kubeConfig, namespace, simNamespace)
if err != nil {
return err
}
opts.DefaultNamespace = simDefaultNamespace
opts.ClusterID = clusterID
opts.NoLeaderElect = true
return agent.Start(ctx, kubeConfig, simNamespace, simNamespace, &opts)
}
func setupNamespace(ctx context.Context, kubeConfig, namespace, simNamespace string) (string, error) {
cfg, err := kubeconfig.GetNonInteractiveClientConfig(kubeConfig).ClientConfig()
if err != nil {
return "", err
}
cfg.RateLimiter = ratelimit.None
k8s, err := kubernetes.NewForConfig(cfg)
if err != nil {
return "", err
}
kubeSystem, err := k8s.CoreV1().Namespaces().Get(ctx, "kube-system", metav1.GetOptions{})
if err != nil {
return "", err
}
clusterID := name.SafeConcatName(simNamespace, strings.SplitN(string(kubeSystem.UID), "-", 2)[0])
if _, err = k8s.CoreV1().Secrets(simNamespace).Get(ctx, register.CredName, metav1.GetOptions{}); err != nil {
secret, err := k8s.CoreV1().Secrets(namespace).Get(ctx, register.BootstrapCredName, metav1.GetOptions{})
if err != nil {
return "", err
}
conf, err := k8s.CoreV1().ConfigMaps(namespace).Get(ctx, config.AgentConfigName, metav1.GetOptions{})
if apierrors.IsNotFound(err) {
conf = nil
} else if err != nil {
return "", err
}
_, err = k8s.CoreV1().Namespaces().Create(ctx, &corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: simNamespace,
},
}, metav1.CreateOptions{})
if err != nil && !apierrors.IsAlreadyExists(err) {
return "", err
}
_, err = k8s.CoreV1().Secrets(simNamespace).Create(ctx, &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: secret.Name,
Namespace: simNamespace,
},
Data: secret.Data,
}, metav1.CreateOptions{})
if err != nil && !apierrors.IsAlreadyExists(err) {
return "", err
}
if conf != nil {
conf, err := injectConfig(conf, simNamespace)
if err != nil {
return "", err
}
_, err = k8s.CoreV1().ConfigMaps(simNamespace).Create(ctx, &corev1.ConfigMap{
ObjectMeta: metav1.ObjectMeta{
Name: conf.Name,
Namespace: simNamespace,
Labels: conf.Labels,
Annotations: conf.Annotations,
},
Data: conf.Data,
}, metav1.CreateOptions{})
if err != nil && !apierrors.IsAlreadyExists(err) {
return "", err
}
}
}
return clusterID, agent.Register(ctx, kubeConfig, simNamespace, clusterID)
}
func injectConfig(cm *corev1.ConfigMap, simNamespace string) (*corev1.ConfigMap, error) {
cfg, err := config.ReadConfig(cm)
if err != nil {
return nil, err
}
if cfg.Labels == nil {
cfg.Labels = map[string]string{}
}
cfg.Labels["fleet.cattle.io/non-managed-agent"] = "true"
cfg.Labels["simulator-namespace"] = simNamespace
return config.ToConfigMap(cm.Namespace, cm.Name, cfg)
}