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k8s.go
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package k8s
import (
"cmp"
"context"
"encoding/json"
"errors"
"fmt"
"runtime"
"strconv"
"sync"
"time"
corev1 "k8s.io/api/core/v1"
kerrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/discovery/cached/memory"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/metadata"
"k8s.io/client-go/rest"
"k8s.io/client-go/restmapper"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/retry"
"github.com/davidmdm/x/xerr"
"github.com/davidmdm/yoke/internal"
)
const (
ResourceReleaseMapping = "yoke-resource-release-mapping"
NSKubeSystem = "kube-system"
yoke = "yoke"
)
func yokePrefix(release string) string { return yoke + "-" + release }
type Client struct {
dynamic *dynamic.DynamicClient
clientset *kubernetes.Clientset
meta metadata.Interface
mapper *restmapper.DeferredDiscoveryRESTMapper
}
func NewClientFromKubeConfig(path string) (*Client, error) {
restcfg, err := clientcmd.BuildConfigFromFlags("", path)
if err != nil {
return nil, fmt.Errorf("failed to build k8 config: %w", err)
}
restcfg.Burst = cmp.Or(restcfg.Burst, 300)
restcfg.QPS = cmp.Or(restcfg.QPS, 50)
return NewClient(restcfg)
}
func NewClient(cfg *rest.Config) (*Client, error) {
dynamicClient, err := dynamic.NewForConfig(cfg)
if err != nil {
return nil, fmt.Errorf("failed to create dynamic client component: %w", err)
}
meta, err := metadata.NewForConfig(cfg)
if err != nil {
return nil, fmt.Errorf("failed to create metadata client component: %w", err)
}
clientset, err := kubernetes.NewForConfig(cfg)
if err != nil {
return nil, fmt.Errorf("failed to create k8 clientset: %w", err)
}
return &Client{
dynamic: dynamicClient,
clientset: clientset,
meta: meta,
mapper: restmapper.NewDeferredDiscoveryRESTMapper(memory.NewMemCacheClient(clientset.DiscoveryClient)),
}, nil
}
type ApplyResourcesOpts struct {
SkipDryRun bool
ForceConflicts bool
}
func (client Client) ApplyResources(ctx context.Context, resources []*unstructured.Unstructured, opts ApplyResourcesOpts) error {
defer internal.DebugTimer(ctx, "apply resources")()
if !opts.SkipDryRun {
dryOpts := ApplyOpts{DryRun: true}
if err := xerr.MultiErrOrderedFrom("dry run", client.applyMany(ctx, resources, dryOpts)...); err != nil {
return err
}
}
applyOpts := ApplyOpts{DryRun: false, ForceConflicts: opts.ForceConflicts}
return xerr.MultiErrOrderedFrom("", client.applyMany(ctx, resources, applyOpts)...)
}
func (client Client) applyMany(ctx context.Context, resources []*unstructured.Unstructured, opts ApplyOpts) []error {
var wg sync.WaitGroup
wg.Add(len(resources))
errs := make([]error, len(resources))
semaphore := make(chan struct{}, runtime.NumCPU())
for i, resource := range resources {
go func() {
defer wg.Done()
semaphore <- struct{}{}
defer func() { <-semaphore }()
err := client.ApplyResource(ctx, resource, opts)
if err != nil {
err = fmt.Errorf("%s: %w", internal.Canonical(resource), err)
}
errs[i] = err
}()
}
wg.Wait()
return errs
}
type ApplyOpts struct {
DryRun bool
ForceConflicts bool
}
func (client Client) ApplyResource(ctx context.Context, resource *unstructured.Unstructured, opts ApplyOpts) error {
defer internal.DebugTimer(
ctx,
fmt.Sprintf(
"%sapply resource %s/%s",
func() string {
if opts.DryRun {
return "dry "
}
return ""
}(),
resource.GetKind(),
resource.GetName(),
),
)()
resourceInterface, err := client.GetDynamicResourceInterface(resource)
if err != nil {
return fmt.Errorf("failed to resolve resource: %w", err)
}
dryRun := func() []string {
if opts.DryRun {
return []string{metav1.DryRunAll}
}
return nil
}()
data, err := json.Marshal(resource)
if err != nil {
return err
}
_, err = resourceInterface.Patch(
ctx,
resource.GetName(),
types.ApplyPatchType,
data,
metav1.PatchOptions{
FieldManager: yoke,
Force: &opts.ForceConflicts,
DryRun: dryRun,
},
)
return err
}
func (client Client) RemoveOrphans(ctx context.Context, previous, current []*unstructured.Unstructured) ([]*unstructured.Unstructured, error) {
defer internal.DebugTimer(ctx, "remove orphaned resources")()
set := make(map[string]struct{})
for _, resource := range current {
set[internal.Canonical(resource)] = struct{}{}
}
var errs []error
var removedResources []*unstructured.Unstructured
for _, resource := range previous {
func() {
name := internal.Canonical(resource)
if _, ok := set[name]; ok {
return
}
defer internal.DebugTimer(ctx, "delete resource "+name)()
resourceInterface, err := client.GetDynamicResourceInterface(resource)
if err != nil {
errs = append(errs, fmt.Errorf("failed to resolve resource %s: %w", name, err))
return
}
if err := resourceInterface.Delete(ctx, resource.GetName(), metav1.DeleteOptions{}); err != nil {
errs = append(errs, fmt.Errorf("failed to delete %s: %w", name, err))
return
}
removedResources = append(removedResources, resource)
}()
}
return removedResources, xerr.MultiErrOrderedFrom("", errs...)
}
func (client Client) GetRevisions(ctx context.Context, release string) (*internal.Revisions, error) {
defer internal.DebugTimer(ctx, "get revisions for "+release)
mapping, err := client.mapper.RESTMapping(schema.GroupKind{Kind: "Secret"})
if err != nil {
return nil, fmt.Errorf("failed to get resource mapping for Secret: %w", err)
}
var labelSelector metav1.LabelSelector
metav1.AddLabelToSelector(&labelSelector, internal.LabelRelease, release)
list, err := client.meta.Resource(mapping.Resource).Namespace(NSKubeSystem).List(ctx, metav1.ListOptions{
LabelSelector: metav1.FormatLabelSelector(&labelSelector),
})
if err != nil {
return nil, fmt.Errorf("failed to list revision items: %w", err)
}
revisions := internal.Revisions{Release: release}
for _, item := range list.Items {
revisions.Add(internal.Revision{
Name: item.Name,
Source: internal.Source{
Ref: item.Annotations[internal.AnnotationSourceURL],
Checksum: item.Annotations[internal.AnnotationSourceChecksum],
},
CreatedAt: internal.MustParseTime(item.Annotations[internal.AnnotationCreatedAt]),
ActiveAt: internal.MustParseTime(item.Annotations[internal.AnnotationActiveAt]),
Resources: internal.MustParseInt(item.Annotations[internal.AnnotationResourceCount]),
})
}
return &revisions, nil
}
func (client Client) DeleteRevisions(ctx context.Context, revisions internal.Revisions) error {
defer internal.DebugTimer(ctx, "delete revision history "+revisions.Release)()
secrets := client.clientset.CoreV1().Secrets(NSKubeSystem)
var errs []error
for _, revision := range revisions.History {
if err := secrets.Delete(ctx, revision.Name, metav1.DeleteOptions{}); err != nil {
errs = append(errs, fmt.Errorf("%s: %w", revision.Name, err))
}
}
return xerr.MultiErrOrderedFrom("removing revision history secrets", errs...)
}
func (client Client) GetAllRevisions(ctx context.Context) ([]internal.Revisions, error) {
mapping, err := client.mapper.RESTMapping(schema.GroupKind{Kind: "Secret"})
if err != nil {
return nil, fmt.Errorf("failed to get resource mapping for Secret: %w", err)
}
var selector metav1.LabelSelector
metav1.AddLabelToSelector(&selector, internal.LabelKind, "revision")
list, err := client.meta.Resource(mapping.Resource).Namespace(NSKubeSystem).List(ctx, metav1.ListOptions{
LabelSelector: metav1.FormatLabelSelector(&selector),
})
if err != nil {
return nil, err
}
releases := map[string]struct{}{}
for _, item := range list.Items {
releases[item.Labels[internal.LabelRelease]] = struct{}{}
}
var result []internal.Revisions
for release := range releases {
revisions, err := client.GetRevisions(ctx, release)
if err != nil {
return nil, fmt.Errorf("failed to get revisions for release %s: %w", release, err)
}
result = append(result, *revisions)
}
return result, nil
}
func (client Client) CreateRevision(ctx context.Context, release string, revision internal.Revision, resources []*unstructured.Unstructured) error {
name := yokePrefix(release) + "-" + internal.RandomString()
data, err := json.Marshal(resources)
if err != nil {
return fmt.Errorf("failed to marshal resources: %w", err)
}
_, err = client.clientset.CoreV1().Secrets(NSKubeSystem).Create(
ctx,
&corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: name,
Labels: map[string]string{
internal.LabelKind: "revision",
internal.LabelRelease: release,
},
Annotations: map[string]string{
internal.AnnotationCreatedAt: revision.CreatedAt.Format(time.RFC3339),
internal.AnnotationActiveAt: revision.ActiveAt.Format(time.RFC3339),
internal.AnnotationResourceCount: strconv.Itoa(revision.Resources),
internal.AnnotationSourceURL: revision.Source.Ref,
internal.AnnotationSourceChecksum: revision.Source.Checksum,
},
},
StringData: map[string]string{
internal.KeyResources: string(data),
},
},
metav1.CreateOptions{FieldManager: yoke},
)
return err
}
func (client Client) UpdateRevisionActiveState(ctx context.Context, name string) error {
secrets := client.clientset.CoreV1().Secrets(NSKubeSystem)
secret, err := secrets.Get(ctx, name, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("failed to get revision secret: %w", err)
}
secret.Annotations[internal.AnnotationActiveAt] = time.Now().Format(time.RFC3339)
_, err = secrets.Update(ctx, secret, metav1.UpdateOptions{FieldManager: yoke})
return err
}
func (client Client) GetRevisionResources(ctx context.Context, revision internal.Revision) ([]*unstructured.Unstructured, error) {
secret, err := client.clientset.CoreV1().Secrets(NSKubeSystem).Get(ctx, revision.Name, metav1.GetOptions{})
if err != nil {
return nil, err
}
var resources []*unstructured.Unstructured
err = json.Unmarshal(secret.Data[internal.KeyResources], &resources)
return resources, err
}
func (client Client) GetDynamicResourceInterface(resource *unstructured.Unstructured) (dynamic.ResourceInterface, error) {
apiResource, err := client.LookupResourceMapping(resource)
if err != nil {
return nil, err
}
if apiResource.Scope.Name() == meta.RESTScopeNameNamespace {
return client.dynamic.Resource(apiResource.Resource).Namespace(resource.GetNamespace()), nil
}
return client.dynamic.Resource(apiResource.Resource), nil
}
func (client *Client) LookupResourceMapping(resource *unstructured.Unstructured) (*meta.RESTMapping, error) {
gvk := schema.FromAPIVersionAndKind(resource.GetAPIVersion(), resource.GetKind())
mapping, err := client.mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
if err != nil && meta.IsNoMatchError(err) {
client.mapper.Reset()
mapping, err = client.mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
}
return mapping, err
}
func (client Client) UpdateResourceReleaseMapping(ctx context.Context, release string, create, remove []string) error {
defer internal.DebugTimer(ctx, "update resource to release mapping")()
configMaps := client.clientset.CoreV1().ConfigMaps(NSKubeSystem)
return retry.RetryOnConflict(retry.DefaultRetry, func() error {
configMap, err := configMaps.Get(ctx, ResourceReleaseMapping, metav1.GetOptions{})
if kerrors.IsNotFound(err) {
mapping := map[string]string{}
for _, value := range create {
mapping[value] = release
}
_, err := configMaps.Create(
ctx,
&corev1.ConfigMap{
ObjectMeta: metav1.ObjectMeta{
Name: ResourceReleaseMapping,
Labels: map[string]string{"internal.yoke/kind": "resource-mapping"},
},
Data: mapping,
},
metav1.CreateOptions{FieldManager: yoke},
)
return err
}
if err != nil {
return fmt.Errorf("failed to get resource to release mapping: %w", err)
}
if configMap.Data == nil {
configMap.Data = make(map[string]string, len(create))
}
for _, value := range remove {
delete(configMap.Data, value)
}
for _, value := range create {
configMap.Data[value] = release
}
_, err = configMaps.Update(ctx, configMap, metav1.UpdateOptions{FieldManager: yoke})
return err
})
}
func (client Client) GetResourceReleaseMapping(ctx context.Context) (map[string]string, error) {
configMaps := client.clientset.CoreV1().ConfigMaps(NSKubeSystem)
configMap, err := configMaps.Get(ctx, ResourceReleaseMapping, metav1.GetOptions{})
if err != nil {
if kerrors.IsNotFound(err) {
return make(map[string]string), nil
}
return nil, err
}
mapping := configMap.Data
if mapping == nil {
mapping = make(map[string]string)
}
return mapping, nil
}
func (client Client) ValidateOwnership(ctx context.Context, release string, resources []*unstructured.Unstructured) error {
resourceReleaseMapping, err := client.GetResourceReleaseMapping(ctx)
if err != nil {
return fmt.Errorf("failed to get release to resource mapping: %w", err)
}
var errs []error
for _, resource := range internal.CanonicalNameList(resources) {
if currentRelease, ok := resourceReleaseMapping[resource]; ok && currentRelease != release {
errs = append(errs, fmt.Errorf("resource %+q is owned by release %+q", resource, currentRelease))
}
}
return xerr.MultiErrOrderedFrom("conflict(s)", errs...)
}
func (client Client) EnsureNamespace(ctx context.Context, namespace string) error {
defer internal.DebugTimer(ctx, "ensuring namespace: "+namespace)()
if _, err := client.clientset.CoreV1().Namespaces().Get(ctx, namespace, metav1.GetOptions{}); err != nil {
if !kerrors.IsNotFound(err) {
return err
}
if _, err := client.clientset.CoreV1().Namespaces().Create(
ctx,
&corev1.Namespace{ObjectMeta: metav1.ObjectMeta{Name: namespace}},
metav1.CreateOptions{},
); err != nil {
return fmt.Errorf("failed to create namespace: %w", err)
}
}
return nil
}
func (client Client) GetInClusterState(ctx context.Context, resource *unstructured.Unstructured) (*unstructured.Unstructured, error) {
defer internal.DebugTimer(ctx, "get in-cluster state for "+internal.Canonical(resource))()
resourceInterface, err := client.GetDynamicResourceInterface(resource)
if err != nil {
return nil, fmt.Errorf("failed to get dynamic resource interface: %w", err)
}
state, err := resourceInterface.Get(ctx, resource.GetName(), metav1.GetOptions{})
if kerrors.IsNotFound(err) {
err = nil
}
return state, err
}
type WaitOptions struct {
Timeout time.Duration
Interval time.Duration
}
func (client Client) WaitForReady(ctx context.Context, resource *unstructured.Unstructured, opts WaitOptions) error {
defer internal.DebugTimer(ctx, fmt.Sprintf("waiting for %s to be ready", internal.Canonical(resource)))()
// TODO: let user configure these values?
var (
interval = cmp.Or(opts.Interval, time.Second)
timeout = cmp.Or(opts.Timeout, 2*time.Minute)
)
timer := time.NewTimer(0)
defer timer.Stop()
ctx, cancel := context.WithTimeoutCause(ctx, timeout, fmt.Errorf("%s timeout reached", timeout))
defer cancel()
for {
select {
case <-ctx.Done():
return context.Cause(ctx)
case <-timer.C:
state, err := client.GetInClusterState(ctx, resource)
if err != nil {
if errors.Is(err, context.DeadlineExceeded) {
err = fmt.Errorf("%w: %w", err, context.Cause(ctx))
}
return fmt.Errorf("failed to get in cluster state: %w", err)
}
if state == nil {
return fmt.Errorf("resource not found")
}
if isReady(ctx, state) {
return nil
}
timer.Reset(interval)
}
}
}
func (client Client) WaitForReadyMany(ctx context.Context, resources []*unstructured.Unstructured, opts WaitOptions) error {
defer internal.DebugTimer(ctx, "waiting for resources to become ready")()
var wg sync.WaitGroup
wg.Add(len(resources))
defer wg.Wait()
ctx, cancel := context.WithCancel(ctx)
defer cancel()
errs := make(chan error, len(resources))
go func() {
wg.Wait()
close(errs)
}()
for _, resource := range resources {
go func() {
defer wg.Done()
if err := client.WaitForReady(ctx, resource, opts); err != nil {
errs <- fmt.Errorf("failed to get readiness for %s: %w", internal.Canonical(resource), err)
}
}()
}
return <-errs
}