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clusternamespace.go
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clusternamespace.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package kubernetes
import (
"context"
"encoding/json"
"fmt"
"io"
"net"
"time"
"google.golang.org/protobuf/types/known/anypb"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"namespacelabs.dev/foundation/framework/kubernetes/kubedef"
"namespacelabs.dev/foundation/internal/artifacts/oci"
"namespacelabs.dev/foundation/internal/console"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/runtime"
"namespacelabs.dev/foundation/internal/runtime/kubernetes/client"
"namespacelabs.dev/foundation/internal/runtime/kubernetes/kubeobserver"
"namespacelabs.dev/foundation/schema"
runtimepb "namespacelabs.dev/foundation/schema/runtime"
"namespacelabs.dev/foundation/schema/storage"
"namespacelabs.dev/foundation/std/cfg"
"namespacelabs.dev/foundation/std/tasks"
)
type ClusterNamespace struct {
cluster *Cluster
target clusterTarget
}
type clusterTarget struct {
env *schema.Environment
namespace string
}
var _ runtime.ClusterNamespace = &ClusterNamespace{}
var _ kubedef.KubeClusterNamespace = &ClusterNamespace{}
func ConnectToNamespace(ctx context.Context, env cfg.Context) (*ClusterNamespace, error) {
cluster, err := ConnectToCluster(ctx, env.Configuration())
if err != nil {
return nil, err
}
bound, err := cluster.Bind(env)
if err != nil {
return nil, err
}
return bound.(*ClusterNamespace), nil
}
func (r *ClusterNamespace) KubeConfig() kubedef.KubeConfig {
return kubedef.KubeConfig{
Context: r.cluster.computedClient.HostEnv.GetContext(),
Environment: r.target.env,
Namespace: r.target.namespace,
}
}
func (cn *ClusterNamespace) Cluster() runtime.Cluster {
return cn.cluster
}
func (cn *ClusterNamespace) Planner() runtime.Planner {
return Planner{fetchSystemInfo: cn.cluster.SystemInfo, target: cn.target}
}
func (r *ClusterNamespace) FetchEnvironmentDiagnostics(ctx context.Context) (*storage.EnvironmentDiagnostics, error) {
systemInfo, err := r.cluster.SystemInfo(ctx)
if err != nil {
return nil, err
}
events, err := r.cluster.cli.CoreV1().Events(r.target.namespace).List(ctx, metav1.ListOptions{})
if err != nil {
return nil, fnerrors.New("kubernetes: failed to obtain event list: %w", err)
}
// Ignore failures, this is best effort.
eventsBytes, _ := json.Marshal(events)
kube := &kubedef.KubernetesEnvDiagnostics{
SystemInfo: systemInfo,
SerializedEventList: string(eventsBytes),
}
diag := &storage.EnvironmentDiagnostics{Runtime: "kubernetes"}
serializedKube, err := anypb.New(kube)
if err != nil {
return nil, fnerrors.New("kubernetes: failed to serialize KubernetesEnvDiagnostics")
}
diag.RuntimeSpecific = append(diag.RuntimeSpecific, serializedKube)
return diag, nil
}
func (r *ClusterNamespace) startTerminal(ctx context.Context, cli *kubernetes.Clientset, server runtime.Deployable, rio runtime.TerminalIO, cmd []string) error {
pod, err := r.resolvePod(ctx, cli, rio.Stderr, server)
if err != nil {
return err
}
return r.cluster.lowLevelAttachTerm(ctx, cli, pod.Namespace, pod.Name, rio, "exec", &corev1.PodExecOptions{
Command: cmd,
Stdin: rio.Stdin != nil,
Stdout: rio.Stdout != nil,
Stderr: rio.Stderr != nil,
TTY: rio.TTY,
})
}
func (r *ClusterNamespace) WaitUntilReady(ctx context.Context, srv runtime.Deployable) error {
fmt.Fprintf(console.Debug(ctx), "wait-until-ready: asPods: %v deployable: %+v\n", deployAsPods(r.target.env), srv)
return tasks.Action("deployable.wait-until-ready").
Scope(srv.GetPackageRef().AsPackageName()).
Arg("id", srv.GetId()).Run(ctx, func(ctx context.Context) error {
return client.PollImmediateWithContext(ctx, 500*time.Millisecond, 5*time.Minute, func(ctx context.Context) (bool, error) {
if ready, err := r.areServicesReady(ctx, srv); err != nil || !ready {
return ready, err
}
if deployAsPods(r.target.env) {
return r.isPodReady(ctx, srv)
}
switch srv.GetDeployableClass() {
case string(schema.DeployableClass_STATELESS):
deployment, err := r.cluster.cli.AppsV1().Deployments(r.target.namespace).Get(ctx, kubedef.MakeDeploymentId(srv), metav1.GetOptions{})
if err != nil {
return false, err
}
replicas := deployment.Status.Replicas
readyReplicas := deployment.Status.ReadyReplicas
updatedReplicas := deployment.Status.UpdatedReplicas
return kubeobserver.AreReplicasReady(replicas, readyReplicas, updatedReplicas), nil
case string(schema.DeployableClass_STATEFUL):
deployment, err := r.cluster.cli.AppsV1().StatefulSets(r.target.namespace).Get(ctx, kubedef.MakeDeploymentId(srv), metav1.GetOptions{})
if err != nil {
return false, err
}
replicas := deployment.Status.Replicas
readyReplicas := deployment.Status.ReadyReplicas
updatedReplicas := deployment.Status.UpdatedReplicas
return kubeobserver.AreReplicasReady(replicas, readyReplicas, updatedReplicas), nil
case string(schema.DeployableClass_MANUAL), string(schema.DeployableClass_ONESHOT):
return r.isPodReady(ctx, srv)
default:
return false, fnerrors.InternalError("don't how to check for readiness of %q", srv.GetDeployableClass())
}
})
})
}
func (r *ClusterNamespace) areServicesReady(ctx context.Context, srv runtime.Deployable) (bool, error) {
if !client.IsInclusterClient(r.cluster.cli) {
// Emitting this debug message as only incluster deployments know how to determine service readiness.
fmt.Fprintf(console.Debug(ctx), "will not wait for services of server %s...\n", srv.GetName())
// Assume service is always ready for now.
// TODO implement readiness check that also supports non-incluster deployments.
return true, nil
}
// TODO only check services that are required
services, err := r.cluster.cli.CoreV1().Services(r.target.namespace).List(ctx, metav1.ListOptions{
LabelSelector: kubedef.SerializeSelector(kubedef.SelectById(srv)),
})
if err != nil {
return false, err
}
for _, s := range services.Items {
for _, port := range s.Spec.Ports {
addr := fmt.Sprintf("%s.%s.svc.cluster.local:%d", s.Name, s.Namespace, port.Port)
conn, err := net.DialTimeout("tcp", addr, 100*time.Millisecond)
if err != nil {
fmt.Fprintf(console.Debug(ctx), "failed to dial %s:%d: %v\n", s.Name, port.Port, err)
// Service not ready.
return false, nil
}
conn.Close()
}
}
return true, nil
}
func (r *ClusterNamespace) isPodReady(ctx context.Context, srv runtime.Deployable) (bool, error) {
pod, err := r.cluster.cli.CoreV1().Pods(r.target.namespace).Get(ctx, kubedef.MakeDeploymentId(srv), metav1.GetOptions{})
if err != nil {
return false, err
}
if pod.Status.Phase == corev1.PodSucceeded || pod.Status.Phase == corev1.PodFailed {
return true, nil
}
for _, reason := range pod.Status.Conditions {
if reason.Type == corev1.PodReady && reason.Status == corev1.ConditionTrue {
return true, nil
}
}
return false, nil
}
// Return true on the callback to signal you're done observing.
func (r *ClusterNamespace) Observe(ctx context.Context, srv runtime.Deployable, opts runtime.ObserveOpts, onInstance func(runtime.ObserveEvent) (bool, error)) error {
type Entry struct {
Instance *runtimepb.ContainerReference
Version string
Deployable *runtimepb.Deployable
}
announced := map[string]Entry{}
trackContainer := func(pod corev1.Pod, instance *runtimepb.ContainerReference) (bool, error) {
if _, has := announced[instance.UniqueId]; has {
return false, nil
}
proto := runtime.DeployableToProto(srv)
entry := Entry{
Instance: instance,
Version: pod.ResourceVersion,
Deployable: proto,
}
announced[instance.UniqueId] = entry
return onInstance(runtime.ObserveEvent{
Deployable: entry.Deployable,
ContainerReference: instance,
Version: entry.Version,
Added: true,
})
}
untrackContainer := func(_ corev1.Pod, instance *runtimepb.ContainerReference) (bool, error) {
existing, has := announced[instance.UniqueId]
if !has {
return false, nil
}
delete(announced, instance.UniqueId)
return onInstance(runtime.ObserveEvent{
Deployable: existing.Deployable,
ContainerReference: instance,
Version: existing.Version,
Removed: true,
})
}
_, err := kubeobserver.WatchPods(ctx, r.cluster.cli, r.target.namespace, kubedef.SelectById(srv), func(pod corev1.Pod) (any, bool, error) {
instance := kubedef.MakePodRef(r.target.namespace, pod.Name, kubedef.ServerCtrName(srv), srv)
t := untrackContainer
if pod.Status.Phase == corev1.PodRunning {
t = trackContainer
}
if done, err := t(pod, instance); err != nil {
return nil, false, err
} else if done {
return nil, true, nil
}
if ObserveInitContainerLogs {
for _, container := range pod.Spec.InitContainers {
instance := kubedef.MakePodRef(r.target.namespace, pod.Name, container.Name, srv)
if done, err := t(pod, instance); err != nil {
return nil, false, err
} else if done {
return nil, true, nil
}
}
}
return nil, false, nil
})
return err
}
func (r *ClusterNamespace) WaitForTermination(ctx context.Context, object runtime.Deployable) ([]runtime.ContainerStatus, error) {
if object.GetDeployableClass() != string(schema.DeployableClass_ONESHOT) && object.GetDeployableClass() != string(schema.DeployableClass_MANUAL) {
return nil, fnerrors.InternalError("WaitForTermination: only support one-shot deployments")
}
cli := r.cluster.cli
namespace := r.target.namespace
podName := kubedef.MakeDeploymentId(object)
return kubeobserver.WatchDeployable(ctx, "deployable.wait-until-done", cli, namespace, object, func(pod corev1.Pod) ([]runtime.ContainerStatus, bool, error) {
if pod.Status.Phase != corev1.PodFailed && pod.Status.Phase != corev1.PodSucceeded {
return nil, false, nil
}
var all []corev1.ContainerStatus
all = append(all, pod.Status.ContainerStatuses...)
all = append(all, pod.Status.InitContainerStatuses...)
var status []runtime.ContainerStatus
for _, container := range all {
st := runtime.ContainerStatus{
Reference: kubedef.MakePodRef(namespace, podName, container.Name, object),
}
if container.State.Terminated != nil {
if container.State.Terminated.ExitCode != 0 {
st.TerminationError = runtime.ErrContainerExitStatus{ExitCode: container.State.Terminated.ExitCode}
}
}
status = append(status, st)
}
return status, true, nil
})
}
func (r *ClusterNamespace) ForwardPort(ctx context.Context, server runtime.Deployable, containerPort int32, localAddrs []string, callback runtime.SinglePortForwardedFunc) (io.Closer, error) {
if containerPort <= 0 {
return nil, fnerrors.BadInputError("invalid port number: %d", containerPort)
}
return r.cluster.RawForwardPort(ctx, server.GetPackageRef().GetPackageName(), r.target.namespace, kubedef.SelectById(server), int(containerPort), localAddrs, callback)
}
func (r *ClusterNamespace) DialServer(ctx context.Context, server runtime.Deployable, containerPort int32) (net.Conn, error) {
if containerPort <= 0 {
return nil, fnerrors.BadInputError("invalid port number: %d", containerPort)
}
return r.cluster.RawDialServer(ctx, r.target.namespace, kubedef.SelectById(server), int(containerPort))
}
func (r *ClusterNamespace) ResolveContainers(ctx context.Context, object runtime.Deployable) ([]*runtimepb.ContainerReference, error) {
return kubeobserver.WatchDeployable(ctx, "deployable.resolve-containers", r.cluster.cli, r.target.namespace, object,
func(pod corev1.Pod) ([]*runtimepb.ContainerReference, bool, error) {
if pod.Status.Phase != corev1.PodRunning && pod.Status.Phase != corev1.PodFailed && pod.Status.Phase != corev1.PodSucceeded {
return nil, false, nil
}
var refs []*runtimepb.ContainerReference
for _, init := range pod.Status.InitContainerStatuses {
refs = append(refs, kubedef.MakePodRef(pod.Namespace, pod.Name, init.Name, object))
}
for _, container := range pod.Status.ContainerStatuses {
refs = append(refs, kubedef.MakePodRef(pod.Namespace, pod.Name, container.Name, object))
}
return refs, true, nil
})
}
func (r *ClusterNamespace) resolvePod(ctx context.Context, cli *kubernetes.Clientset, w io.Writer, obj runtime.Deployable) (corev1.Pod, error) {
return resolvePodByLabels(ctx, cli, w, r.target.namespace, kubedef.SelectById(obj))
}
func (r *ClusterNamespace) DeployedConfigImageID(ctx context.Context, server runtime.Deployable) (oci.ImageID, error) {
return tasks.Return(ctx, tasks.Action("kubernetes.resolve-config-image-id").Scope(schema.PackageName(server.GetPackageRef().GetPackageName())),
func(ctx context.Context) (oci.ImageID, error) {
// XXX need a StatefulSet variant.
d, err := r.cluster.cli.AppsV1().Deployments(r.target.namespace).Get(ctx, kubedef.MakeDeploymentId(server), metav1.GetOptions{})
if err != nil {
// XXX better error messages.
return oci.ImageID{}, err
}
cfgimage, ok := d.Annotations[kubedef.K8sConfigImage]
if !ok {
return oci.ImageID{}, fnerrors.BadInputError("%s: %q is missing as an annotation in %q",
server.GetPackageRef().GetPackageName(), kubedef.K8sConfigImage, kubedef.MakeDeploymentId(server))
}
imgid, err := oci.ParseImageID(cfgimage)
if err != nil {
return imgid, err
}
tasks.Attachments(ctx).AddResult("ref", imgid.ImageRef())
return imgid, nil
})
}
func (r *ClusterNamespace) StartTerminal(ctx context.Context, server runtime.Deployable, rio runtime.TerminalIO, command string, rest ...string) error {
cmd := append([]string{command}, rest...)
return r.startTerminal(ctx, r.cluster.cli, server, rio, cmd)
}
func (r *ClusterNamespace) DeleteRecursively(ctx context.Context, wait bool) (bool, error) {
return DeleteAllRecursively(ctx, r.cluster.cli, wait, nil, r.target.namespace)
}
func (r *ClusterNamespace) DeleteDeployable(ctx context.Context, deployable runtime.Deployable) error {
listOpts := metav1.ListOptions{LabelSelector: kubedef.SerializeSelector(kubedef.SelectById(deployable))}
switch deployable.GetDeployableClass() {
case string(schema.DeployableClass_ONESHOT), string(schema.DeployableClass_MANUAL):
return r.cluster.cli.CoreV1().Pods(r.target.namespace).DeleteCollection(ctx, metav1.DeleteOptions{}, listOpts)
case string(schema.DeployableClass_STATEFUL):
return r.cluster.cli.AppsV1().StatefulSets(r.target.namespace).DeleteCollection(ctx, metav1.DeleteOptions{}, listOpts)
case string(schema.DeployableClass_STATELESS):
return r.cluster.cli.AppsV1().Deployments(r.target.namespace).DeleteCollection(ctx, metav1.DeleteOptions{}, listOpts)
default:
return fnerrors.InternalError("%s: unsupported deployable class", deployable.GetDeployableClass())
}
}