/
discovery-config.go
223 lines (198 loc) · 6.65 KB
/
discovery-config.go
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package discovery
import (
"context"
"reflect"
rbacv1 "k8s.io/api/rbac/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/klog"
configv1alpha1 "github.com/liqotech/liqo/apis/config/v1alpha1"
crdclient "github.com/liqotech/liqo/pkg/crdClient"
"github.com/liqotech/liqo/pkg/utils"
)
// ConfigProvider interface provides methods to access the Discovery and API Server configuration.
type ConfigProvider interface {
GetConfig() *configv1alpha1.DiscoveryConfig
GetAPIServerConfig() *configv1alpha1.APIServerConfig
}
// GetConfig returns the configuration of the discovery component.
func (discovery *Controller) GetConfig() *configv1alpha1.DiscoveryConfig {
discovery.configMutex.RLock()
defer discovery.configMutex.RUnlock()
return discovery.Config
}
// GetAuthConfig returns the authentication configuration.
func (discovery *Controller) GetAuthConfig() *configv1alpha1.AuthConfig {
discovery.configMutex.RLock()
defer discovery.configMutex.RUnlock()
return discovery.authConfig
}
// GetAPIServerConfig returns the configuration of the local APIServer (address, port).
func (discovery *Controller) GetAPIServerConfig() *configv1alpha1.APIServerConfig {
discovery.configMutex.RLock()
defer discovery.configMutex.RUnlock()
return discovery.apiServerConfig
}
func (discovery *Controller) getDiscoveryConfig(client *crdclient.CRDClient, kubeconfigPath string) error {
waitFirst := make(chan bool)
isFirst := true
go utils.WatchConfiguration(func(configuration *configv1alpha1.ClusterConfig) {
discovery.handleConfiguration(&configuration.Spec.DiscoveryConfig)
discovery.handleDispatcherConfig(&configuration.Spec.DispatcherConfig)
discovery.handleAPIServerConfig(&configuration.Spec.APIServerConfig)
discovery.handleAuthConfig(&configuration.Spec.AuthConfig)
if isFirst {
waitFirst <- true
isFirst = false
}
}, client, kubeconfigPath)
<-waitFirst
close(waitFirst)
return nil
}
func (discovery *Controller) handleAuthConfig(config *configv1alpha1.AuthConfig) {
discovery.configMutex.Lock()
defer discovery.configMutex.Unlock()
if reflect.DeepEqual(&config, discovery.authConfig) {
klog.V(6).Info("New and old auth configs are deep equals")
klog.V(8).Infof("Old config: %v\nNew config: %v", discovery.authConfig, config)
return
}
discovery.authConfig = config.DeepCopy()
}
func (discovery *Controller) handleAPIServerConfig(config *configv1alpha1.APIServerConfig) {
discovery.configMutex.Lock()
defer discovery.configMutex.Unlock()
if reflect.DeepEqual(config, discovery.apiServerConfig) {
klog.V(6).Info("New and old apiServer configs are deep equals")
klog.V(8).Infof("Old config: %v\nNew config: %v", discovery.apiServerConfig, config)
return
}
discovery.apiServerConfig = config.DeepCopy()
}
func (discovery *Controller) handleDispatcherConfig(config *configv1alpha1.DispatcherConfig) {
discovery.configMutex.Lock()
defer discovery.configMutex.Unlock()
if reflect.DeepEqual(config, discovery.crdReplicatorConfig) {
klog.V(6).Info("New and old crdReplicator configs are deep equals")
klog.V(8).Infof("Old config: %v\nNew config: %v", discovery.crdReplicatorConfig, config)
return
}
role, err := discovery.crdClient.Client().RbacV1().ClusterRoles().Get(context.TODO(), "crdreplicator-role",
metav1.GetOptions{})
create := false
if errors.IsNotFound(err) {
// create it
role = &rbacv1.ClusterRole{
ObjectMeta: metav1.ObjectMeta{
Name: "crdreplicator-role",
},
Rules: []rbacv1.PolicyRule{},
}
create = true
} else if err != nil {
// other errors
klog.Error(err)
return
}
// create rules array
rules := []rbacv1.PolicyRule{}
for _, res := range config.ResourcesToReplicate {
rules = append(rules, rbacv1.PolicyRule{
Verbs: []string{"get", "update", "patch", "list", "watch", "delete", "create", "deletecollection"},
APIGroups: []string{res.GroupVersionResource.Group},
Resources: []string{res.GroupVersionResource.Resource, res.GroupVersionResource.Resource + "/status"},
})
}
role.Rules = rules
if create {
_, err = discovery.crdClient.Client().RbacV1().ClusterRoles().Create(context.TODO(), role, metav1.CreateOptions{})
} else {
_, err = discovery.crdClient.Client().RbacV1().ClusterRoles().Update(context.TODO(), role, metav1.UpdateOptions{})
}
if err != nil {
klog.Error(err)
return
}
discovery.crdReplicatorConfig = config.DeepCopy()
}
func (discovery *Controller) handleConfiguration(config *configv1alpha1.DiscoveryConfig) {
discovery.configMutex.Lock()
defer discovery.configMutex.Unlock()
reloadServer := false
reloadClient := false
if discovery.Config == nil {
// first iteration
discovery.Config = config.DeepCopy()
} else {
// other iterations
if discovery.Config.ClusterName != config.ClusterName {
discovery.Config.ClusterName = config.ClusterName
reloadClient = true
reloadServer = true
}
if discovery.Config.Domain != config.Domain {
discovery.Config.Domain = config.Domain
reloadServer = true
reloadClient = true
}
if discovery.Config.EnableAdvertisement != config.EnableAdvertisement {
discovery.Config.EnableAdvertisement = config.EnableAdvertisement
reloadServer = true
}
if discovery.Config.Name != config.Name {
discovery.Config.Name = config.Name
reloadServer = true
}
if discovery.Config.Port != config.Port {
discovery.Config.Port = config.Port
reloadServer = true
}
if discovery.Config.AuthService != config.AuthService {
discovery.Config.AuthService = config.AuthService
reloadServer = true
reloadClient = true
}
if discovery.Config.Service != config.Service {
discovery.Config.Service = config.Service
reloadServer = true
reloadClient = true
}
if discovery.Config.TTL != config.TTL {
discovery.Config.TTL = config.TTL
reloadServer = true
}
if discovery.Config.AutoJoin != config.AutoJoin {
discovery.Config.AutoJoin = config.AutoJoin
reloadClient = true
}
if discovery.Config.EnableDiscovery != config.EnableDiscovery {
discovery.Config.EnableDiscovery = config.EnableDiscovery
reloadClient = true
}
if reloadServer {
discovery.reloadServer()
}
if reloadClient {
discovery.reloadClient()
}
}
}
func (discovery *Controller) reloadServer() {
klog.Info("Reload mDNS server")
discovery.stopMDNS <- true
if discovery.Config.EnableAdvertisement {
close(discovery.stopMDNS)
discovery.stopMDNS = make(chan bool, 1)
go discovery.register()
}
}
func (discovery *Controller) reloadClient() {
klog.Info("Reload mDNS client")
discovery.stopMDNSClient <- true
if discovery.Config.EnableDiscovery {
close(discovery.stopMDNSClient)
discovery.stopMDNSClient = make(chan bool, 1)
go discovery.startResolver(discovery.stopMDNSClient)
}
}