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controller.go
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controller.go
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package deploy
import (
"bufio"
"bytes"
"context"
"crypto/sha256"
"encoding/hex"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
"time"
errors2 "github.com/pkg/errors"
v1 "github.com/rancher/k3s/types/apis/k3s.cattle.io/v1"
"github.com/rancher/norman"
"github.com/rancher/norman/objectclient"
"github.com/rancher/norman/pkg/objectset"
"github.com/rancher/norman/types"
"github.com/sirupsen/logrus"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
yamlDecoder "k8s.io/apimachinery/pkg/util/yaml"
"k8s.io/client-go/discovery"
"k8s.io/client-go/rest"
)
const (
ns = "kube-system"
startKey = "_start_"
)
func WatchFiles(ctx context.Context, bases ...string) error {
server := norman.GetServer(ctx)
addons := v1.ClientsFrom(ctx).Addon
w := &watcher{
addonCache: addons.Cache(),
addons: addons,
bases: bases,
restConfig: *server.Runtime.LocalConfig,
discovery: server.K8sClient.Discovery(),
clients: map[schema.GroupVersionKind]*objectclient.ObjectClient{},
}
addons.Enqueue("", startKey)
addons.Interface().AddHandler(ctx, "addon-start", func(key string, _ *v1.Addon) (runtime.Object, error) {
if key == startKey {
go w.start(ctx)
}
return nil, nil
})
return nil
}
type watcher struct {
addonCache v1.AddonClientCache
addons v1.AddonClient
bases []string
restConfig rest.Config
discovery discovery.DiscoveryInterface
clients map[schema.GroupVersionKind]*objectclient.ObjectClient
namespaced map[schema.GroupVersionKind]bool
}
func (w *watcher) start(ctx context.Context) {
force := true
for {
if err := w.listFiles(force); err == nil {
force = false
} else {
logrus.Errorf("failed to process config: %v", err)
}
select {
case <-ctx.Done():
return
case <-time.After(15 * time.Second):
}
}
}
func (w *watcher) listFiles(force bool) error {
var errs []error
for _, base := range w.bases {
if err := w.listFilesIn(base, force); err != nil {
errs = append(errs, err)
}
}
return types.NewErrors(errs...)
}
func (w *watcher) listFilesIn(base string, force bool) error {
files, err := ioutil.ReadDir(base)
if os.IsNotExist(err) {
return nil
} else if err != nil {
return err
}
skips := map[string]bool{}
for _, file := range files {
if strings.HasSuffix(file.Name(), ".skip") {
skips[strings.TrimSuffix(file.Name(), ".skip")] = true
}
}
var errs []error
for _, file := range files {
if skipFile(file.Name(), skips) {
continue
}
p := filepath.Join(base, file.Name())
if err := w.deploy(p, !force); err != nil {
errs = append(errs, errors2.Wrapf(err, "failed to process %s", p))
}
}
return types.NewErrors(errs...)
}
func (w *watcher) deploy(path string, compareChecksum bool) error {
content, err := ioutil.ReadFile(path)
if err != nil {
return err
}
name := name(path)
addon, err := w.addon(name)
if err != nil {
return err
}
checksum := checksum(content)
if compareChecksum && checksum == addon.Spec.Checksum {
logrus.Debugf("Skipping existing deployment of %s, check=%v, checksum %s=%s", path, compareChecksum, checksum, addon.Spec.Checksum)
return nil
}
objectSet, err := objectSet(content)
if err != nil {
return err
}
clients, err := w.apply(addon, objectSet)
if err != nil {
return err
}
if w.clients == nil {
w.clients = map[schema.GroupVersionKind]*objectclient.ObjectClient{}
}
addon.Spec.Source = path
addon.Spec.Checksum = checksum
addon.Status.GVKs = nil
for gvk, client := range clients {
addon.Status.GVKs = append(addon.Status.GVKs, gvk)
w.clients[gvk] = client
}
if addon.UID == "" {
_, err := w.addons.Create(&addon)
return err
}
_, err = w.addons.Update(&addon)
return err
}
func (w *watcher) addon(name string) (v1.Addon, error) {
addon, err := w.addonCache.Get(ns, name)
if errors.IsNotFound(err) {
addon = v1.NewAddon(ns, name, v1.Addon{})
} else if err != nil {
return v1.Addon{}, err
}
return *addon, nil
}
func (w *watcher) apply(addon v1.Addon, set *objectset.ObjectSet) (map[schema.GroupVersionKind]*objectclient.ObjectClient, error) {
var (
err error
)
op := objectset.NewProcessor(addon.Name)
op.AllowDiscovery(w.discovery, w.restConfig)
ds := op.NewDesiredSet(nil, set)
for _, gvk := range addon.Status.GVKs {
var (
namespaced bool
)
client, ok := w.clients[gvk]
if ok {
namespaced = w.namespaced[gvk]
} else {
client, namespaced, err = objectset.NewDiscoveredClient(gvk, w.restConfig, w.discovery)
if err != nil {
return nil, err
}
if w.namespaced == nil {
w.namespaced = map[schema.GroupVersionKind]bool{}
}
w.namespaced[gvk] = namespaced
}
ds.AddDiscoveredClient(gvk, client, namespaced)
}
if err := ds.Apply(); err != nil {
return nil, err
}
return ds.DiscoveredClients(), nil
}
func objectSet(content []byte) (*objectset.ObjectSet, error) {
objs, err := yamlToObjects(bytes.NewBuffer(content))
if err != nil {
return nil, err
}
os := objectset.NewObjectSet()
os.Add(objs...)
return os, nil
}
func name(path string) string {
name := filepath.Base(path)
return strings.SplitN(name, ".", 2)[0]
}
func checksum(bytes []byte) string {
d := sha256.Sum256(bytes)
return hex.EncodeToString(d[:])
}
func isEmptyYaml(yaml []byte) bool {
isEmpty := true
lines := bytes.Split(yaml, []byte("\n"))
for _, l := range lines {
s := bytes.TrimSpace(l)
if string(s) != "---" && !bytes.HasPrefix(s, []byte("#")) && string(s) != "" {
isEmpty = false
}
}
return isEmpty
}
func yamlToObjects(in io.Reader) ([]runtime.Object, error) {
var result []runtime.Object
reader := yamlDecoder.NewYAMLReader(bufio.NewReaderSize(in, 4096))
for {
raw, err := reader.Read()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
if !isEmptyYaml(raw) {
obj, err := toObjects(raw)
if err != nil {
return nil, err
}
result = append(result, obj...)
}
}
return result, nil
}
func toObjects(bytes []byte) ([]runtime.Object, error) {
bytes, err := yamlDecoder.ToJSON(bytes)
if err != nil {
return nil, err
}
obj, _, err := unstructured.UnstructuredJSONScheme.Decode(bytes, nil, nil)
if err != nil {
return nil, err
}
if l, ok := obj.(*unstructured.UnstructuredList); ok {
var result []runtime.Object
for _, obj := range l.Items {
copy := obj
result = append(result, ©)
}
return result, nil
}
return []runtime.Object{obj}, nil
}
func skipFile(fileName string, skips map[string]bool) bool {
switch {
case strings.HasPrefix(fileName, "."):
return true
case skips[fileName]:
return true
case strings.HasSuffix(fileName, ".json"):
return false
case strings.HasSuffix(fileName, ".yml"):
return false
case strings.HasSuffix(fileName, ".yaml"):
return false
default:
return true
}
}