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validator.go
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validator.go
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/*
Copyright 2014 Google Inc. All rights reserved.
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 apiserver
import (
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"strconv"
"github.com/GoogleCloudPlatform/kubernetes/pkg/health"
)
// TODO: this basic interface is duplicated in N places. consolidate?
type httpGet interface {
Get(url string) (*http.Response, error)
}
type Server struct {
Addr string
Port int
Path string
}
// validator is responsible for validating the cluster and serving
type validator struct {
// a list of servers to health check
servers func() map[string]Server
client httpGet
}
func (s *Server) check(client httpGet) (health.Status, string, error) {
resp, err := client.Get("http://" + net.JoinHostPort(s.Addr, strconv.Itoa(s.Port)) + s.Path)
if err != nil {
return health.Unknown, "", err
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return health.Unknown, string(data), err
}
if resp.StatusCode != http.StatusOK {
return health.Unhealthy, string(data),
fmt.Errorf("unhealthy http status code: %d (%s)", resp.StatusCode, resp.Status)
}
return health.Healthy, string(data), nil
}
type ServerStatus struct {
Component string `json:"component,omitempty"`
Health string `json:"health,omitempty"`
HealthCode health.Status `json:"healthCode,omitempty"`
Msg string `json:"msg,omitempty"`
Err string `json:"err,omitempty"`
}
func (v *validator) ServeHTTP(w http.ResponseWriter, r *http.Request) {
reply := []ServerStatus{}
for name, server := range v.servers() {
status, msg, err := server.check(v.client)
var errorMsg string
if err != nil {
errorMsg = err.Error()
} else {
errorMsg = "nil"
}
reply = append(reply, ServerStatus{name, status.String(), status, msg, errorMsg})
}
data, err := json.MarshalIndent(reply, "", " ")
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return
}
w.WriteHeader(http.StatusOK)
w.Write(data)
}
// NewValidator creates a validator for a set of servers.
func NewValidator(servers func() map[string]Server) (http.Handler, error) {
return &validator{
servers: servers,
client: &http.Client{},
}, nil
}
func makeTestValidator(servers map[string]string, get httpGet) (http.Handler, error) {
result := map[string]Server{}
for name, value := range servers {
host, port, err := net.SplitHostPort(value)
if err != nil {
return nil, fmt.Errorf("invalid server spec: %s (%v)", value, err)
}
val, err := strconv.Atoi(port)
if err != nil {
return nil, fmt.Errorf("invalid server spec: %s (%v)", port, err)
}
result[name] = Server{Addr: host, Port: val, Path: "/healthz"}
}
v, e := NewValidator(func() map[string]Server { return result })
if e == nil {
v.(*validator).client = get
}
return v, e
}