mirror of https://github.com/k3s-io/k3s
108 lines
3.5 KiB
Go
108 lines
3.5 KiB
Go
/*
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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 health
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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/GoogleCloudPlatform/kubernetes/pkg/util"
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"github.com/golang/glog"
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)
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// HTTPGetInterface is an abstract interface for testability. It abstracts the interface of http.Client.Get.
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// This is exported because some other packages may want to do direct HTTP checks.
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type HTTPGetInterface interface {
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Get(url string) (*http.Response, error)
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}
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// HTTPHealthChecker is an implementation of HealthChecker which checks container health by sending HTTP Get requests.
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type HTTPHealthChecker struct {
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client HTTPGetInterface
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}
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func NewHTTPHealthChecker(client *http.Client) HealthChecker {
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return &HTTPHealthChecker{client: &http.Client{}}
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}
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// getURLParts parses the components of the target URL. For testability.
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func getURLParts(currentState api.PodState, container api.Container) (string, int, string, error) {
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params := container.LivenessProbe.HTTPGet
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if params == nil {
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return "", -1, "", fmt.Errorf("no HTTP parameters specified: %v", container)
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}
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port := -1
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switch params.Port.Kind {
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case util.IntstrInt:
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port = params.Port.IntVal
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case util.IntstrString:
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port = findPortByName(container, params.Port.StrVal)
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if port == -1 {
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// Last ditch effort - maybe it was an int stored as string?
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var err error
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if port, err = strconv.Atoi(params.Port.StrVal); err != nil {
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return "", -1, "", err
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}
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}
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}
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if port == -1 {
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return "", -1, "", fmt.Errorf("unknown port: %v", params.Port)
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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 = currentState.PodIP
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}
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return host, port, params.Path, nil
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}
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// formatURL formats a URL from args. For testability.
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func formatURL(host string, port int, path string) string {
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return fmt.Sprintf("http://%s:%d%s", host, port, path)
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}
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// DoHTTPCheck checks if a GET request to the url succeeds.
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// If the HTTP response code is successful (i.e. 400 > code >= 200), it returns Healthy.
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// If the HTTP response code is unsuccessful, it returns Unhealthy.
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// It returns Unknown and err if the HTTP communication itself fails.
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// This is exported because some other packages may want to do direct HTTP checks.
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func DoHTTPCheck(url string, client HTTPGetInterface) (Status, error) {
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res, err := client.Get(url)
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if err != nil {
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return Unknown, err
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}
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defer res.Body.Close()
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if res.StatusCode >= http.StatusOK && res.StatusCode < http.StatusBadRequest {
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return Healthy, nil
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}
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glog.V(1).Infof("Health check failed for %s, Response: %v", url, *res)
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return Unhealthy, nil
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}
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// HealthCheck checks if the container is healthy by trying sending HTTP Get requests to the container.
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func (h *HTTPHealthChecker) HealthCheck(podFullName string, currentState api.PodState, container api.Container) (Status, error) {
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host, port, path, err := getURLParts(currentState, container)
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if err != nil {
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return Unknown, err
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}
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return DoHTTPCheck(formatURL(host, port, path), h.client)
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}
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