pod_args.go

/*
Copyright AppsCode Inc. and Contributors

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 doctor

import (
	"strconv"
	"strings"

	core_util "kmodules.xyz/client-go/core/v1"
	"kmodules.xyz/client-go/meta"
	"kmodules.xyz/client-go/tools/exec"

	"github.com/pkg/errors"
	core "k8s.io/api/core/v1"
)

func (d *Doctor) processPod(pod core.Pod) (*APIServerConfig, error) {
	running, err := core_util.PodRunningAndReady(pod)
	if err != nil {
		return nil, err
	}
	if !running {
		return nil, errors.Errorf("pod %s is not running", pod.Name)
	}

	if len(pod.Spec.Containers) != 1 {
		return nil, errors.Errorf("pod %s has %d containers, expected 1 container", pod.Name, len(pod.Spec.Containers))
	}
	container := pod.Spec.Containers[0]
	args := map[string]string{}
	if len(container.Command) > 1 {
		if container.Command[0] == "kube-apiserver" {
			args = meta.ParseArgumentListToMap(container.Command)
		} else if strings.HasSuffix(container.Command[0], "hyperkube") && container.Command[1] == "apiserver" {
			args = meta.ParseArgumentListToMap(container.Command[1:])
		} else {
			var cmd string
			for _, c := range container.Command {
				if strings.Contains(c, "kube-apiserver") {
					cmd = c
					break
				}
			}
			if cmd == "" {
				return nil, errors.Errorf(`pod %s is using command %s, expected "kube-apiserver"`, pod.Name, container.Command[0])
			}

			fields := strings.Fields(cmd)
			for i, w := range fields {
				if strings.HasSuffix(w, "kube-apiserver") {
					args = meta.ParseArgumentListToMap(fields[i:])
					break
				}
			}
		}
	} else if len(container.Args) > 0 {
		args = meta.ParseArgumentListToMap(container.Args)
	}

	var config APIServerConfig

	config.PodName = pod.Name
	config.NodeName = pod.Spec.NodeName
	config.PodIP = pod.Status.PodIP
	config.HostIP = pod.Status.HostIP

	{
		// ref: https://github.com/golang/go/blob/e5f0c1f6c9dc382bdc6a0ec1a0d5e1fc6f833485/src/net/http/transport.go#L35
		config.ProxySettings = map[string]string{}
		for _, e := range container.Env {
			switch e.Name {
			case "no_proxy":
			case "NO_PROXY":
			case "http_proxy":
			case "HTTP_PROXY":
				config.ProxySettings[e.Name] = e.Value
			}
		}
	}

	if v, ok := args["admission-control"]; ok && v != "" {
		config.AdmissionControl = strings.Split(v, ",")
	}
	if v, ok := args["enable-admission-plugins"]; ok && v != "" {
		config.AdmissionControl = strings.Split(v, ",")
	}

	if v, ok := args["client-ca-file"]; ok && v != "" {
		data, err := exec.ExecIntoPod(d.config, &pod, exec.Command("cat", v))
		if err != nil {
			return nil, err
		}
		config.ClientCAData = strings.TrimSpace(data)
	}

	if v, ok := args["tls-cert-file"]; ok && v != "" {
		data, err := exec.ExecIntoPod(d.config, &pod, exec.Command("cat", v))
		if err != nil {
			return nil, err
		}
		config.TLSCertData = strings.TrimSpace(data)
	}

	if v, ok := args["requestheader-client-ca-file"]; ok && v != "" {
		data, err := exec.ExecIntoPod(d.config, &pod, exec.Command("cat", v))
		if err != nil {
			return nil, err
		}
		config.RequestHeaderCAData = strings.TrimSpace(data)
	}

	config.AllowPrivileged, err = strconv.ParseBool(args["allow-privileged"])
	if err != nil {
		return nil, err
	}

	if v, ok := args["authorization-mode"]; ok && v != "" {
		config.AuthorizationMode = strings.Split(v, ",")
	}

	if v, ok := args["runtime-config"]; ok && v != "" {
		apis := strings.Split(v, ",")
		for _, api := range apis {
			parts := strings.SplitN(api, "=", 2)
			if len(parts) == 2 {
				if e, _ := strconv.ParseBool(parts[1]); e {
					config.RuntimeConfig.Enabled = append(config.RuntimeConfig.Enabled, parts[0])
				} else {
					config.RuntimeConfig.Disabled = append(config.RuntimeConfig.Disabled, parts[0])
				}
			} else {
				config.RuntimeConfig.Enabled = append(config.RuntimeConfig.Enabled, parts[0])
			}
		}
	}

	if v, ok := args["feature-gates"]; ok && v != "" {
		features := strings.Split(v, ",")
		for _, f := range features {
			parts := strings.SplitN(f, "=", 2)
			if len(parts) == 2 {
				if e, _ := strconv.ParseBool(parts[1]); e {
					config.FeatureGates.Enabled = append(config.FeatureGates.Enabled, parts[0])
				} else {
					config.FeatureGates.Disabled = append(config.FeatureGates.Disabled, parts[0])
				}
			} else {
				config.FeatureGates.Enabled = append(config.FeatureGates.Enabled, parts[0])
			}
		}
	}
	return &config, nil
}