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manager.go
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manager.go
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package admission
import (
"os"
log "github.com/sirupsen/logrus"
klient "github.com/flant/kube-client/client"
"github.com/flant/shell-operator/pkg/webhook/server"
)
// DefaultConfigurationId is a ConfigurationId for ValidatingWebhookConfiguration/MutatingWebhookConfiguration
// without suffix.
const DefaultConfigurationId = "hooks"
// WebhookManager is a public interface to be used from operator.go.
//
// No dynamic configuration for now. The steps are:
// - Init manager
// - Call AddWebhook for every binding in hooks
// - Start() to run server and create ValidatingWebhookConfiguration/MutatingWebhookConfiguration
type WebhookManager struct {
KubeClient klient.Client
Settings *WebhookSettings
Namespace string
DefaultConfigurationId string
Server *server.WebhookServer
ValidatingResources map[string]*ValidatingWebhookResource
MutatingResources map[string]*MutatingWebhookResource
Handler *WebhookHandler
}
func NewWebhookManager() *WebhookManager {
return &WebhookManager{
ValidatingResources: make(map[string]*ValidatingWebhookResource),
MutatingResources: make(map[string]*MutatingWebhookResource),
}
}
func (m *WebhookManager) WithKubeClient(kubeClient klient.Client) {
m.KubeClient = kubeClient
}
func (m *WebhookManager) WithAdmissionEventHandler(handler AdmissionEventHandlerFn) {
if m.Handler == nil {
m.Handler = &WebhookHandler{
Handler: handler,
}
} else {
m.Handler.Handler = handler
}
}
// Init creates dependencies
func (m *WebhookManager) Init() error {
log.Info("Initialize admission webhooks manager. Load certificates.")
if m.DefaultConfigurationId == "" {
m.DefaultConfigurationId = DefaultConfigurationId
}
// settings
caBundleBytes, err := os.ReadFile(m.Settings.CAPath)
if err != nil {
return err
}
m.Settings.CABundle = caBundleBytes
m.Handler = NewWebhookHandler()
m.Server = &server.WebhookServer{
Settings: &m.Settings.Settings,
Namespace: m.Namespace,
Router: m.Handler.Router,
}
return nil
}
func (m *WebhookManager) AddValidatingWebhook(config *ValidatingWebhookConfig) {
confId := config.Metadata.ConfigurationId
if confId == "" {
confId = m.DefaultConfigurationId
}
r, ok := m.ValidatingResources[confId]
if !ok {
r = NewValidatingWebhookResource(
WebhookResourceOptions{
m.KubeClient,
m.Namespace,
m.Settings.ConfigurationName + "-" + confId,
m.Settings.ServiceName,
m.Settings.CABundle,
},
)
m.ValidatingResources[confId] = r
}
r.Set(config)
}
func (m *WebhookManager) AddMutatingWebhook(config *MutatingWebhookConfig) {
confId := config.Metadata.ConfigurationId
if confId == "" {
confId = m.DefaultConfigurationId
}
r, ok := m.MutatingResources[confId]
if !ok {
r = NewMutatingWebhookResource(
WebhookResourceOptions{
m.KubeClient,
m.Namespace,
m.Settings.ConfigurationName + "-" + confId,
m.Settings.ServiceName,
m.Settings.CABundle,
},
)
m.MutatingResources[confId] = r
}
r.Set(config)
}
func (m *WebhookManager) Start() error {
err := m.Server.Start()
if err != nil {
return err
}
for _, r := range m.ValidatingResources {
err = r.Register()
if err != nil {
return err
}
}
for _, r := range m.MutatingResources {
err = r.Register()
if err != nil {
return err
}
}
return nil
}