/
deployer.go
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/
deployer.go
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package deploy
import (
"bytes"
"context"
"fmt"
"strings"
"text/template"
"github.com/Masterminds/sprig/v3"
apierrors "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/client-go/dynamic"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"sigs.k8s.io/yaml"
"github.com/seal-io/walrus/utils/bytespool"
"github.com/seal-io/walrus/utils/files"
"github.com/seal-io/walrus/utils/log"
"github.com/seal-io/walrus/utils/version"
)
type Deployer struct {
logger log.Logger
restCfg *rest.Config
}
type ChartApp struct {
Name string
Namespace string
ChartPath string
ChartURL string
Values map[string]any
// The following fields used for generate Values.
ValuesContext map[string]any
ValuesTemplate string
}
func New(restCfg *rest.Config) (*Deployer, error) {
copyCfg := rest.CopyConfig(restCfg)
copyCfg.Timeout = 0
copyCfg.QPS = 16
copyCfg.Burst = 64
copyCfg.UserAgent = version.GetUserAgent()
return &Deployer{
restCfg: copyCfg,
logger: log.WithName("k8s").WithName("deployer"),
}, nil
}
func NewWithKubeconfig(kubeconfig string) (*Deployer, error) {
restCfg, err := clientcmd.RESTConfigFromKubeConfig([]byte(kubeconfig))
if err != nil {
return nil, err
}
return New(restCfg)
}
func (d *Deployer) EnsureYaml(ctx context.Context, yamlContent []byte) error {
d.logger.Debugf("ensuring yaml")
dynamicClient, err := dynamic.NewForConfig(d.restCfg)
if err != nil {
return fmt.Errorf("error create dynamic client: %w", err)
}
var (
decoder = scheme.Codecs.UniversalDeserializer()
yamls = bytes.Split(yamlContent, []byte("\n---\n"))
objs = make([]*unstructured.Unstructured, 0, len(yamls))
)
for _, v := range yamls {
obj := &unstructured.Unstructured{}
if _, _, err = decoder.Decode(v, nil, obj); err != nil {
return err
}
objs = append(objs, obj)
}
for _, obj := range objs {
var (
name = obj.GetName()
ns = obj.GetNamespace()
gvk = obj.GetObjectKind().GroupVersionKind()
resource, _ = meta.UnsafeGuessKindToResource(gvk)
)
switch {
case ns != "":
exist, err := dynamicClient.Resource(resource).Namespace(ns).Get(ctx, name, metav1.GetOptions{})
if err != nil && !apierrors.IsNotFound(err) {
return fmt.Errorf("error get namespaced resource %v from yaml: %w", resource, err)
}
// Update.
if exist != nil {
_, err = dynamicClient.Resource(resource).Namespace(ns).Update(ctx, obj, metav1.UpdateOptions{})
if err != nil {
return fmt.Errorf("error update namespaced resource %v from yaml: %w", resource, err)
}
continue
}
// Create.
_, err = dynamicClient.Resource(resource).Namespace(ns).Create(ctx, obj, metav1.CreateOptions{})
if err != nil && !apierrors.IsAlreadyExists(err) {
return fmt.Errorf("error create namespaced resource %v from yaml: %w", resource, err)
}
default:
exist, err := dynamicClient.Resource(resource).Get(ctx, name, metav1.GetOptions{})
if err != nil && !apierrors.IsNotFound(err) {
return fmt.Errorf("error get resource %v from yaml: %w", resource, err)
}
if exist != nil {
_, err = dynamicClient.Resource(resource).Update(ctx, obj, metav1.UpdateOptions{})
if err != nil {
return fmt.Errorf("error update resource %v from yaml: %w", resource, err)
}
continue
}
_, err = dynamicClient.Resource(resource).Create(ctx, obj, metav1.CreateOptions{})
if err != nil && !apierrors.IsAlreadyExists(err) {
return fmt.Errorf("error create resource %v from yaml: %w", resource, err)
}
}
}
return nil
}
func (d *Deployer) EnsureChart(app *ChartApp, createNamespace, replace bool) error {
d.logger.Debugf("ensuring helm chart")
helm, err := NewHelm(d.restCfg, Options{
CreateNamespace: createNamespace,
Namespace: app.Namespace,
})
if err != nil {
return err
}
res, err := helm.GetRelease(app.Name)
if err != nil {
// Error isn't found.
if !strings.Contains(err.Error(), "not found") {
return fmt.Errorf("error get release %s:%s, %w", app.Namespace, app.Name, err)
}
// Error is not found, continue to install.
} else {
switch {
case isSucceed(res) && !replace:
return nil
case isUnderway(res):
return fmt.Errorf("helm chart %s:%s is under status %s", app.Namespace, app.Name, res.Info.Status)
case isFailed(res) && !replace:
return fmt.Errorf("helm chart %s:%s deploy failed: %s", app.Namespace, app.Name, res.Info.Description)
}
}
if replace {
if err = helm.Uninstall(app.Name); err != nil &&
!strings.Contains(err.Error(), "not found") {
return err
}
}
// Download chart if isn't existed.
if !files.Exists(app.ChartPath) {
err = helm.Download(app.ChartURL, app.ChartPath)
if err != nil {
return err
}
}
// Render values if needed.
if app.ValuesContext != nil && app.ValuesTemplate != "" {
tmpl, err := template.New(app.Name + "-values").
Funcs(funcMap()).
Parse(app.ValuesTemplate)
if err != nil {
return err
}
buf := bytespool.GetBuffer()
defer bytespool.Put(buf)
if err = tmpl.Execute(buf, app.ValuesContext); err != nil {
return err
}
values := map[string]any{}
if err = yaml.Unmarshal(buf.Bytes(), &values); err != nil {
return err
}
app.Values = values
}
if err = helm.Install(app.Name, app.ChartPath, app.Values); err != nil {
return err
}
return nil
}
func funcMap() template.FuncMap {
fm := sprig.HermeticTxtFuncMap()
fm["toYaml"] = toYAML
return fm
}
// toYAML borrows from helm.sh/helm/pkg/engine/engine.go.
func toYAML(v any) string {
data, err := yaml.Marshal(v)
if err != nil {
// Swallow errors inside of a template.
return ""
}
return strings.TrimSuffix(string(data), "\n")
}