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// Copyright (c) Authors of Clover
//
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Apache License, Version 2.0
// which accompanies this distribution, and is available at
// http://www.apache.org/licenses/LICENSE-2.0
package clovisor
import (
"bytes"
"fmt"
"strconv"
"strings"
core_v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/remotecommand"
)
type ClovisorK8s struct {
client *kubernetes.Clientset
config *rest.Config
}
type monitoring_info_t struct {
namespace string
svc_name string
pod_name string
container_name string
protocol string
port_num uint32
}
var DEFAULT_NAMESPACE = "default"
func K8s_client_init(nodeName string) (*ClovisorK8s, error) {
config, err := rest.InClusterConfig()
if err != nil {
fmt.Println(err.Error())
return nil, err
}
client, err := kubernetes.NewForConfig(config)
if err != nil {
fmt.Println(err.Error())
return nil, err
}
return &ClovisorK8s{
client: client,
config: config,
}, nil
}
func parse_label_cfg(label_cfg string) (string, string, string) {
label_slice := strings.Split(label_cfg, ":")
if len(label_slice) == 1 {
return label_slice[0], "", ""
}
return label_slice[0], label_slice[1], label_slice[2]
}
func (client *ClovisorK8s) Get_monitoring_info(nodeName string) (map[string]*monitoring_info_t,
error) {
labels_list, err := get_cfg_labels(nodeName)
if err != nil {
fmt.Printf("Error getting cfg labels: %v\n", err)
return nil, err
}
namespace, svcs, pods, err := client.fetch_svcs_pods(nodeName, labels_list)
if err != nil {
return nil, err
}
mon_info_map := make(map[string]*monitoring_info_t)
for idx, _ := range svcs {
svc := svcs[idx]
pod := pods[idx]
mon_info := client.get_monitoring_pods(namespace, nodeName, svc, pod)
for k, v := range mon_info {
mon_info_map[k] = v
}
}
return mon_info_map, nil
}
func (client *ClovisorK8s) fetch_svcs_pods(nodeName string,
labels_list []string) (string,
[]*core_v1.ServiceList,
[]*core_v1.PodList, error) {
namespace := DEFAULT_NAMESPACE
/*
* Three cases:
* 1.) no configured namespaces, monitoring all pods in default namesapce
* 2.) if any config only has namespace, monitoring all pods in namespace
* 3.) label is configured, only monitor pods with that label
*/
var svcs []*core_v1.ServiceList
var pods []*core_v1.PodList
if len(labels_list) == 0 {
if svcs_list, err :=
client.client.CoreV1().Services(namespace).List(metav1.ListOptions{});
err != nil {
fmt.Printf("Error fetching service list for namespace %s\n",
namespace)
return namespace, nil, nil, err
} else {
svcs = append(svcs, svcs_list)
}
if pods_list, err :=
client.client.CoreV1().Pods(namespace).List(metav1.ListOptions{});
err != nil {
fmt.Printf("Error fetching pods list for namespace %s\n",
namespace)
return namespace, nil, nil, err
} else {
pods = append(pods, pods_list)
}
} else {
for _, label_str := range labels_list {
var label_selector string
namespace, key, value := parse_label_cfg(label_str)
if len(namespace) == 0 {
fmt.Printf("Error in config: %s not a valid config\n", label_str)
continue
}
if len(key) == 0 {
fmt.Printf("Namespace only config for %s\n", namespace)
} else {
label_selector = fmt.Sprintf("%s=%s", key, value)
}
if svc_list, err :=
client.client.CoreV1().Services(namespace).List(metav1.ListOptions{
LabelSelector: label_selector,
}); err != nil {
fmt.Printf("Error listing services with label %v:%v:%v - %v\n",
key, value, namespace, err.Error())
continue
} else {
svcs = append(svcs, svc_list)
}
if pod_list, err :=
client.client.CoreV1().Pods(namespace).List(metav1.ListOptions{
LabelSelector: label_selector,
}); err != nil {
fmt.Printf("Error listing pods with label %v:%v:%v - %v\n",
key, value, namespace, err.Error())
continue
} else {
pods = append(pods, pod_list)
}
}
}
return namespace, svcs, pods, nil
}
func (client *ClovisorK8s) get_monitoring_pods(
namespace string,
node_name string,
svcs *core_v1.ServiceList,
pods *core_v1.PodList) (map[string]*monitoring_info_t) {
monitoring_info := make(map[string]*monitoring_info_t)
svc_map := make(map[string][]string)
for _, svc := range svcs.Items {
svc_port := svc.Spec.Ports[0]
target_port := svc_port.TargetPort.String()
svc_port_name := svc_port.Name
svc_map[target_port] = append(svc_map[target_port], svc.GetName())
if len(svc_port_name) > 0 {
svc_map[target_port] = append(svc_map[target_port], svc_port_name)
} else {
svc_map[target_port] = append(svc_map[target_port], "tcp")
}
}
for _, v := range pods.Items {
if v.Spec.NodeName == node_name {
pod_name := v.GetName()
monitoring_info[pod_name] = &(monitoring_info_t{})
monitoring_info[pod_name].namespace = namespace
monitoring_info[pod_name].pod_name = pod_name
monitoring_info[pod_name].container_name = v.Spec.Containers[0].Name
monitoring_info[pod_name].port_num = uint32(v.Spec.Containers[0].Ports[0].ContainerPort)
tp_string := strconv.Itoa(int(monitoring_info[pod_name].port_num))
svc_array := svc_map[tp_string]
monitoring_info[pod_name].svc_name = svc_array[0]
if (strings.Contains(svc_array[1], "-")) {
monitoring_info[pod_name].protocol = svc_array[1][:strings.Index(svc_array[1], "-")]
} else {
monitoring_info[pod_name].protocol = svc_array[1]
}
}
}
return monitoring_info
}
func (client *ClovisorK8s) exec_command(command string,
monitoring_info *monitoring_info_t) (string, error) {
// Following code based on:
// https://stackoverflow.com/questions/43314689/example-of-exec-in-k8ss-pod-by-using-go-client
// https://github.com/a4abhishek/Client-Go-Examples/blob/master/exec_to_pod/exec_to_pod.go
exec_req := client.client.CoreV1().RESTClient().Post().
Resource("pods").
Name(monitoring_info.pod_name).
Namespace(monitoring_info.namespace).
SubResource("exec")
scheme := runtime.NewScheme()
if err := core_v1.AddToScheme(scheme); err != nil {
fmt.Printf("Error in exec pods: %v\n", err.Error())
return "", err
}
parameterCodec := runtime.NewParameterCodec(scheme)
exec_req.VersionedParams(&core_v1.PodExecOptions{
Command: strings.Fields(command),
Container: monitoring_info.container_name,
Stdin: false,
Stdout: true,
Stderr: true,
TTY: false,
}, parameterCodec)
exec, err := remotecommand.NewSPDYExecutor(client.config, "POST", exec_req.URL())
if err != nil {
fmt.Printf("Error in remotecommand exec: %v\n", err.Error())
return "", err
}
var stdout, stderr bytes.Buffer
err = exec.Stream(remotecommand.StreamOptions{
Stdin: nil,
Stdout: &stdout,
Stderr: &stderr,
Tty: false,
})
if err != nil {
fmt.Printf("Error in exec stream: %v\n", err.Error())
return "", err
}
stdout_no_newline := strings.TrimSuffix(stdout.String(), "\n")
return stdout_no_newline, nil
}
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