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logProxyGetter.go
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logProxyGetter.go
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package getter
import (
"bytes"
"context"
"fmt"
"github.com/stolostron/multicloud-operators-foundation/pkg/helpers"
"io"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/klog"
"net/http"
addonv1alpha1client "open-cluster-management.io/api/client/addon/clientset/versioned"
"strconv"
)
type LogProxyGetter struct {
AddonClient addonv1alpha1client.Interface
KubeClient kubernetes.Interface
ProxyServiceHost string
ProxyServiceCAFile string
}
func NewLogProxyGetter(addonClient addonv1alpha1client.Interface,
KubeClient kubernetes.Interface,
host, caFile string) *LogProxyGetter {
return &LogProxyGetter{
AddonClient: addonClient,
KubeClient: KubeClient,
ProxyServiceHost: host,
ProxyServiceCAFile: caFile,
}
}
func (c *LogProxyGetter) ProxyServiceAvailable(ctx context.Context, clusterName string) (bool, error) {
_, err := c.AddonClient.AddonV1alpha1().ManagedClusterAddOns(clusterName).Get(ctx, helpers.MsaAddonName, v1.GetOptions{})
if err != nil {
if errors.IsNotFound(err) {
return false, nil
}
return false, fmt.Errorf("failed to get msaCma. %v", err)
}
_, err = c.AddonClient.AddonV1alpha1().ManagedClusterAddOns(clusterName).Get(ctx, helpers.ClusterProxyAddonName, v1.GetOptions{})
if err != nil {
if errors.IsNotFound(err) {
return false, nil
}
return false, fmt.Errorf("failed to get clusterProxyCma. %v", err)
}
return true, nil
}
func (c *LogProxyGetter) NewHandler(ctx context.Context, clusterName, podNamespace, podName, containerName string) (*Handler, error) {
logTokenSecret, err := c.KubeClient.CoreV1().Secrets(clusterName).Get(ctx, helpers.LogManagedServiceAccountName, v1.GetOptions{})
if err != nil {
return nil, fmt.Errorf("faield to get log token secret in cluster %s. %v", clusterName, err)
}
clusterProxyCfg := &rest.Config{
Host: fmt.Sprintf("https://%s/%s", c.ProxyServiceHost, clusterName),
TLSClientConfig: rest.TLSClientConfig{
CAFile: c.ProxyServiceCAFile,
},
BearerToken: string(logTokenSecret.Data["token"]),
}
clusterProxyKubeClient, err := kubernetes.NewForConfig(clusterProxyCfg)
if err != nil {
return nil, err
}
return &Handler{
logClient: clusterProxyKubeClient,
podName: podName,
podNamespace: podNamespace,
containerName: containerName,
}, nil
}
type Handler struct {
logClient kubernetes.Interface
podNamespace, podName, containerName string
}
func (c *Handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
writeResponseErr := func(errInfo string) {
w.WriteHeader(http.StatusBadRequest)
if _, err := w.Write([]byte(errInfo)); err != nil {
klog.Errorf("failed write data to response. %v", err)
}
}
options := &corev1.PodLogOptions{
Container: c.containerName,
}
query := req.URL.Query()
if lines := query.Get("tailLines"); lines != "" {
numLine, err := strconv.ParseInt(lines, 10, 64)
if err == nil {
options.TailLines = &numLine
}
}
if follow := query.Get("follow"); follow == "true" {
options.Follow = true
}
if previous := query.Get("previous"); previous == "true" {
options.Previous = true
}
if timestamps := query.Get("timestamps"); timestamps == "true" {
options.Timestamps = true
}
if sinceSeconds := query.Get("sinceSeconds"); sinceSeconds != "" {
seconds, err := strconv.ParseInt(sinceSeconds, 10, 64)
if err == nil {
options.SinceSeconds = &seconds
}
}
logReq := c.logClient.CoreV1().Pods(c.podNamespace).GetLogs(c.podName, options)
podlogs, err := logReq.Stream(context.Background())
if err != nil {
writeResponseErr(fmt.Sprintf("faield to stream log. %v", err))
return
}
defer podlogs.Close()
buf := new(bytes.Buffer)
_, err = io.Copy(buf, podlogs)
if err != nil {
writeResponseErr(fmt.Sprintf("faield to copy log. %v", err))
return
}
w.Header().Set("Transfer-Encoding", "chunked")
_, err = w.Write(buf.Bytes())
if err != nil {
klog.Errorf("failed to write log to response. %v", err)
return
}
return
}