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proxy.go
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proxy.go
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package service_duplicator
import (
"context"
// "fmt"
"log"
// "strings"
"net/http"
// "net/http/httputil"
// "net/url"
// "regexp"
// "time"
// appsv1 "k8s.io/api/apps/v1"
// core_v1 "k8s.io/api/core/v1"
// autoscalingv1 "k8s.io/api/autoscaling/v1"
// metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
// "k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
// "k8s.io/client-go/tools/cache"
)
// Config the plugin configuration.
type Config struct {
Header string `json:"header,omitempty" yaml:"Header" mapstructure:"Header" default:"X-Forwarded-User"`
Namespace string `json:"namespace,omitempty" yaml:"Namespace" mapstructure:"Namespace" default:"default"`
}
type KubernetesProvider struct {
Client kubernetes.Interface
}
func newKubernetesProvider() (*KubernetesProvider, error) {
config, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
client, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
return &KubernetesProvider{
Client: client,
}, nil
}
// CreateConfig creates the default plugin configuration.
func CreateConfig() *Config {
return &Config{
Header: "X-Forwarded-User",
Namespace: "Asimovo-userspace",
}
}
type ServiceDup struct {
config *Config
provider *KubernetesProvider
next http.Handler
name string
}
// New created a new ServiceDup plugin.
func New(ctx context.Context, next http.Handler, config *Config, name string) (http.Handler, error) {
provider, err := newKubernetesProvider()
if err != nil {
return nil, err
}
return &ServiceDup{
config: config,
provider: provider,
next: next,
name: name,
}, nil
}
func (a *ServiceDup) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
//setup login to Kubernetes API
//Determine current hostname
//Get full config of my associated Service (should be the generic service)
//Get all yamls that are associated with my service
//Search and replace all occurances of the hostname -> servicehost to my current hostname
//Modify the Middleware list
//(optionally)Modify the amount of instances?
//Create all new elements
services := a.provider.Client.CoreV1().Services(a.config.Namespace)
log.Printf("services: %s", services)
a.next.ServeHTTP(rw, req)
}