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/
main.go
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/
main.go
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/*
* Copyright 2022 The flomesh.io Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"context"
"flag"
"fmt"
"github.com/flomesh-io/ErieCanal/pkg/commons"
"github.com/flomesh-io/ErieCanal/pkg/config"
"github.com/flomesh-io/ErieCanal/pkg/kube"
"github.com/flomesh-io/ErieCanal/pkg/version"
"github.com/gin-gonic/gin"
"github.com/pkg/errors"
"github.com/spf13/pflag"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/rest"
"k8s.io/klog/v2"
"k8s.io/klog/v2/klogr"
"math/rand"
"net/http"
"os"
"os/exec"
ctrl "sigs.k8s.io/controller-runtime"
"time"
)
const (
HealthPath = "/healthz"
ReadyPath = "/readyz"
)
type startArgs struct {
erieCanalNamespace string
}
type ingress struct {
k8sApi *kube.K8sAPI
mc *config.MeshConfig
}
func main() {
// process CLI arguments and parse them to flags
args := processFlags()
klog.Infof(commons.AppVersionTemplate, version.Version, version.ImageVersion, version.GitVersion, version.GitCommit, version.BuildDate)
kubeconfig := ctrl.GetConfigOrDie()
k8sApi := newK8sAPI(kubeconfig, args)
if !version.IsSupportedK8sVersion(k8sApi) {
klog.Error(fmt.Errorf("kubernetes server version %s is not supported, requires at least %s",
version.ServerVersion.String(), version.MinK8sVersion.String()))
os.Exit(1)
}
configStore := config.NewStore(k8sApi)
mc := configStore.MeshConfig.GetConfig()
ing := &ingress{k8sApi: k8sApi, mc: mc}
// get ingress codebase
ingressRepoUrl := ing.ingressCodebase()
klog.Infof("Ingress Repo = %q", ingressRepoUrl)
// calculate pipy spawn
spawn := ing.calcPipySpawn()
klog.Infof("PIPY SPAWN = %d", spawn)
// start pipy
startPipy(spawn, ingressRepoUrl)
startHealthAndReadyProbeServer()
}
func processFlags() *startArgs {
klog.InitFlags(nil)
pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
pflag.Parse()
rand.Seed(time.Now().UnixNano())
ctrl.SetLogger(klogr.New())
return &startArgs{
erieCanalNamespace: config.GetErieCanalNamespace(),
}
}
func newK8sAPI(kubeconfig *rest.Config, args *startArgs) *kube.K8sAPI {
api, err := kube.NewAPIForConfig(kubeconfig, 30*time.Second)
if err != nil {
klog.Error(err, "unable to create k8s client")
os.Exit(1)
}
return api
}
func startHealthAndReadyProbeServer() {
router := gin.Default()
router.GET(HealthPath, health)
router.GET(ReadyPath, health)
if err := router.Run(":8081"); err != nil {
klog.Errorf("Failed to start probe server: %s", err)
os.Exit(1)
}
}
func health(c *gin.Context) {
// TODO: check pipy and returns status accordingly
c.String(http.StatusOK, "OK")
}
func (i *ingress) ingressCodebase() string {
if i.mc.Ingress.Namespaced {
return fmt.Sprintf("%s%s/", i.mc.RepoBaseURL(), i.mc.NamespacedIngressCodebasePath(config.GetErieCanalPodNamespace()))
} else {
return fmt.Sprintf("%s%s/", i.mc.RepoBaseURL(), i.mc.IngressCodebasePath())
}
}
func (i *ingress) calcPipySpawn() int64 {
cpuLimits, err := i.getIngressCpuLimitsQuota()
if err != nil {
klog.Fatal(err)
os.Exit(1)
}
klog.Infof("CPU Limits = %#v", cpuLimits)
spawn := int64(1)
if cpuLimits.Value() > 0 {
spawn = cpuLimits.Value()
}
return spawn
}
func (i *ingress) getIngressPod() (*corev1.Pod, error) {
podNamespace := config.GetErieCanalPodNamespace()
podName := config.GetErieCanalPodName()
pod, err := i.k8sApi.Client.CoreV1().Pods(podNamespace).Get(context.TODO(), podName, metav1.GetOptions{})
if err != nil {
klog.Errorf("Error retrieving ingress-pipy pod %s", podName)
return nil, err
}
return pod, nil
}
func (i *ingress) getIngressCpuLimitsQuota() (*resource.Quantity, error) {
pod, err := i.getIngressPod()
if err != nil {
return nil, err
}
for _, c := range pod.Spec.Containers {
if c.Name == "ingress" {
return c.Resources.Limits.Cpu(), nil
}
}
return nil, errors.Errorf("No container named 'ingress' in POD %q", pod.Name)
}
func startPipy(spawn int64, ingressRepoUrl string) {
args := []string{ingressRepoUrl}
if spawn > 1 {
args = append([]string{"--reuse-port", fmt.Sprintf("--threads=%d", spawn)}, args...)
}
cmd := exec.Command("pipy", args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
klog.Infof("cmd = %v", cmd)
if err := cmd.Start(); err != nil {
klog.Fatal(err)
os.Exit(1)
}
}