mirror of https://github.com/k3s-io/k3s
135 lines
3.7 KiB
Go
135 lines
3.7 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 apiserver
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import (
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"crypto/tls"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"strconv"
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"time"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/probe"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
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)
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// TODO: this basic interface is duplicated in N places. consolidate?
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type httpGet interface {
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Get(url string) (*http.Response, error)
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}
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type Server struct {
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Addr string
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Port int
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Path string
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EnableHTTPS bool
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}
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// validator is responsible for validating the cluster and serving
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type validator struct {
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// a list of servers to health check
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servers func() map[string]Server
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rt http.RoundTripper
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}
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type ServerStatus struct {
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Component string `json:"component,omitempty"`
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Health string `json:"health,omitempty"`
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HealthCode probe.Result `json:"healthCode,omitempty"`
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Msg string `json:"msg,omitempty"`
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Err string `json:"err,omitempty"`
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}
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// TODO: can this use pkg/probe/http
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func (server *Server) DoServerCheck(rt http.RoundTripper) (probe.Result, string, error) {
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var client *http.Client
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scheme := "http://"
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if server.EnableHTTPS {
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// TODO(roberthbailey): The servers that use HTTPS are currently the
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// kubelets, and we should be using a standard kubelet client library
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// to talk to them rather than a separate http client.
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transport := &http.Transport{
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Proxy: http.ProxyFromEnvironment,
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Dial: (&net.Dialer{
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Timeout: 30 * time.Second,
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KeepAlive: 30 * time.Second,
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}).Dial,
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TLSHandshakeTimeout: 10 * time.Second,
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TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
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}
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client = &http.Client{Transport: transport}
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scheme = "https://"
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} else {
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client = &http.Client{Transport: rt}
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}
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resp, err := client.Get(scheme + net.JoinHostPort(server.Addr, strconv.Itoa(server.Port)) + server.Path)
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if err != nil {
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return probe.Unknown, "", err
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}
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defer resp.Body.Close()
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data, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return probe.Unknown, string(data), err
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}
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if resp.StatusCode != http.StatusOK {
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return probe.Failure, string(data),
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fmt.Errorf("unhealthy http status code: %d (%s)", resp.StatusCode, resp.Status)
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}
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return probe.Success, string(data), nil
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}
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func (v *validator) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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verb := "get"
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apiResource := ""
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var httpCode int
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reqStart := time.Now()
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defer monitor(&verb, &apiResource, util.GetClient(r), &httpCode, reqStart)
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reply := []ServerStatus{}
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for name, server := range v.servers() {
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transport := v.rt
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status, msg, err := server.DoServerCheck(transport)
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var errorMsg string
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if err != nil {
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errorMsg = err.Error()
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} else {
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errorMsg = "nil"
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}
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reply = append(reply, ServerStatus{name, status.String(), status, msg, errorMsg})
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}
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data, err := json.MarshalIndent(reply, "", " ")
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if err != nil {
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httpCode = http.StatusInternalServerError
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w.WriteHeader(httpCode)
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w.Write([]byte(err.Error()))
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return
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}
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httpCode = http.StatusOK
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w.WriteHeader(httpCode)
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w.Write(data)
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}
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// NewValidator creates a validator for a set of servers.
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func NewValidator(servers func() map[string]Server) http.Handler {
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return &validator{servers: servers, rt: http.DefaultTransport}
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}
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