mirror of https://github.com/k3s-io/k3s
100 lines
2.5 KiB
Go
100 lines
2.5 KiB
Go
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/*
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Copyright 2014 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kubelet
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import (
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"fmt"
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"net/http"
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"strconv"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/golang/glog"
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)
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type HealthChecker interface {
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IsHealthy(container api.Container) (bool, error)
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}
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type httpDoInterface interface {
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Get(string) (*http.Response, error)
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}
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func MakeHealthChecker() HealthChecker {
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return &MuxHealthChecker{
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checkers: map[string]HealthChecker{
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"http": &HTTPHealthChecker{
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client: &http.Client{},
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},
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},
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}
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}
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type MuxHealthChecker struct {
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checkers map[string]HealthChecker
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}
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func (m *MuxHealthChecker) IsHealthy(container api.Container) (bool, error) {
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checker, ok := m.checkers[container.LivenessProbe.Type]
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if !ok || checker == nil {
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glog.Warningf("Failed to find health checker for %s %s", container.Name, container.LivenessProbe.Type)
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return true, nil
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}
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return checker.IsHealthy(container)
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}
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type HTTPHealthChecker struct {
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client httpDoInterface
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}
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func (h *HTTPHealthChecker) findPort(container api.Container, portName string) int64 {
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for _, port := range container.Ports {
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if port.Name == portName {
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// TODO This means you can only health check exposed ports
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return int64(port.HostPort)
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}
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}
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return -1
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}
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func (h *HTTPHealthChecker) IsHealthy(container api.Container) (bool, error) {
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params := container.LivenessProbe.HTTPGet
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port := h.findPort(container, params.Port)
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if port == -1 {
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var err error
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port, err = strconv.ParseInt(params.Port, 10, 0)
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if err != nil {
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return true, err
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}
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}
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var host string
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if len(params.Host) > 0 {
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host = params.Host
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} else {
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host = "localhost"
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}
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url := fmt.Sprintf("http://%s:%d%s", host, port, params.Path)
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res, err := h.client.Get(url)
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if res != nil && res.Body != nil {
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defer res.Body.Close()
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}
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if err != nil {
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// At this point, if it fails, its either a policy (unlikely) or HTTP protocol (likely) error.
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return false, nil
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}
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return res.StatusCode == http.StatusOK, nil
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}
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