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main.go
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main.go
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package main
import (
"errors"
"flag"
"fmt"
"os"
"k8s.io/api/extensions/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
)
const (
exitSuccess = 0
exitInvalidCmdArgs = 1
exitK8sOperationErr = 2
exitNeutral = 78
)
var (
ingressName string
ingressHost string
serviceName string
servicePort int
namespace string
pathRule string
)
func usage() {
_, _ = fmt.Fprintf(flag.CommandLine.Output(), `Usage:
%s add -ingress=<INGRESS_NAME> -host=<INGRESS_HOST> -service=<SERVICE_NAME> -port=<SERVICE_PORT>
%s remove -ingress=<INGRESS_NAME> -host=<INGRESS_HOST>
Options:
`, os.Args[0], os.Args[0])
flag.PrintDefaults()
}
func main() {
flag.StringVar(&ingressName, "ingress", "", "name of kubernetes ingress (required).")
flag.StringVar(&ingressHost, "host", "", "ingress host (required).")
flag.StringVar(&pathRule, "path", "/*", "matching path rules of an incoming request (optional).")
flag.StringVar(&serviceName, "service", "", "name of kubernetes service (required when running 'add').")
flag.IntVar(&servicePort, "port", -1, "port number (optional if one port is opened in service).")
flag.StringVar(&namespace, "namespace", "", "kubernetes namespace (optional).")
flag.Usage = usage
flag.Parse()
op := flag.Arg(0)
err := validateCmdArgs(op)
if err != nil {
_, _ = fmt.Fprintln(os.Stderr, "error:", err)
os.Exit(exitInvalidCmdArgs)
}
status := run(op)
os.Exit(status)
}
func run(operation string) int {
client, err := initClient()
if err != nil {
_, _ = fmt.Fprintln(os.Stderr, "error:", err)
return exitK8sOperationErr
}
ingress, err := client.ExtensionsV1beta1().Ingresses(namespace).Get(ingressName, metav1.GetOptions{})
if err != nil {
_, _ = fmt.Fprintln(os.Stderr, "error:", err)
return exitK8sOperationErr
}
switch operation {
case "add":
if servicePort == -1 {
err = getServicePort(client)
if err != nil {
_, _ = fmt.Fprintln(os.Stderr, "error:", err)
return exitInvalidCmdArgs
}
}
rule := createRule()
if added := addRule(ingress, rule); !added {
return exitSuccess
}
case "remove":
if found := removeRule(ingress); !found {
return exitSuccess
}
}
_, err = client.ExtensionsV1beta1().Ingresses(namespace).Update(ingress)
if err != nil {
_, _ = fmt.Fprintln(os.Stderr, "error:", err)
return exitK8sOperationErr
}
return exitSuccess
}
func validateCmdArgs(op string) error {
switch op {
case "add":
if ingressName == "" || ingressHost == "" || serviceName == "" {
return errors.New("must specify 'ingress', 'host', 'service' and 'port' option")
}
case "remove":
if ingressName == "" || ingressHost == "" {
return errors.New("must specify 'ingress' and 'host'")
}
default:
return errors.New("command not found")
}
return nil
}
func initClient() (client *kubernetes.Clientset, err error) {
loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
loader := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
loadingRules,
&clientcmd.ConfigOverrides{},
)
config, err := loader.ClientConfig()
if err != nil {
return nil, err
}
if namespace == "" {
// Use namespace in context if it's empty.
namespace, _, err = loader.Namespace()
if err != nil {
return nil, err
}
}
return kubernetes.NewForConfig(config)
}
func createRule() v1beta1.IngressRule {
return v1beta1.IngressRule{
Host: ingressHost,
IngressRuleValue: v1beta1.IngressRuleValue{
HTTP: &v1beta1.HTTPIngressRuleValue{
Paths: []v1beta1.HTTPIngressPath{
{
Path: pathRule,
Backend: v1beta1.IngressBackend{
ServiceName: serviceName,
ServicePort: intstr.FromInt(servicePort),
},
},
},
},
},
}
}
func addRule(ingress *v1beta1.Ingress, rule v1beta1.IngressRule) (added bool) {
for _, r := range ingress.Spec.Rules {
if r.Host == rule.Host {
return false
}
}
ingress.Spec.Rules = append(ingress.Spec.Rules, rule)
return true
}
func removeRule(ingress *v1beta1.Ingress) (found bool) {
for i, r := range ingress.Spec.Rules {
if r.Host == ingressHost {
ingress.Spec.Rules = append(ingress.Spec.Rules[:i], ingress.Spec.Rules[i+1:]...)
return true
}
}
return false
}
func getServicePort(client *kubernetes.Clientset) error {
svc, err := client.CoreV1().Services(namespace).Get(serviceName, metav1.GetOptions{})
if err != nil {
return err
}
if len(svc.Spec.Ports) == 1 {
// if one port is opened, use it as a default.
servicePort = int(svc.Spec.Ports[0].Port)
return nil
}
// if no ports is opened or multiple ports are opened,
// we can't choice port number that ingress to specify.
return fmt.Errorf("please specify port number")
}