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validator.go
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validator.go
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/*
Copyright 2014 The Kubernetes Authors.
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 componentstatus
import (
"context"
"crypto/tls"
"sync"
"time"
utilnet "k8s.io/apimachinery/pkg/util/net"
"k8s.io/apiserver/pkg/storage/storagebackend"
"k8s.io/apiserver/pkg/storage/storagebackend/factory"
"k8s.io/kubernetes/pkg/probe"
httpprober "k8s.io/kubernetes/pkg/probe/http"
)
const (
probeTimeOut = 20 * time.Second
)
type ValidatorFn func([]byte) error
type Server interface {
DoServerCheck() (probe.Result, string, error)
}
type HttpServer struct {
Addr string
Port int
Path string
EnableHTTPS bool
TLSConfig *tls.Config
Validate ValidatorFn
Prober httpprober.Prober
Once sync.Once
}
type ServerStatus struct {
// +optional
Component string `json:"component,omitempty"`
// +optional
Health string `json:"health,omitempty"`
// +optional
HealthCode probe.Result `json:"healthCode,omitempty"`
// +optional
Msg string `json:"msg,omitempty"`
// +optional
Err string `json:"err,omitempty"`
}
func (server *HttpServer) DoServerCheck() (probe.Result, string, error) {
// setup the prober
server.Once.Do(func() {
if server.Prober != nil {
return
}
const followNonLocalRedirects = true
server.Prober = httpprober.NewWithTLSConfig(server.TLSConfig, followNonLocalRedirects)
})
scheme := "http"
if server.EnableHTTPS {
scheme = "https"
}
url := utilnet.FormatURL(scheme, server.Addr, server.Port, server.Path)
result, data, err := server.Prober.Probe(url, nil, probeTimeOut)
if err != nil {
return probe.Unknown, "", err
}
if result == probe.Failure {
return probe.Failure, data, err
}
if server.Validate != nil {
if err := server.Validate([]byte(data)); err != nil {
return probe.Failure, data, err
}
}
return result, data, nil
}
type EtcdServer struct {
storagebackend.Config
}
func (server *EtcdServer) DoServerCheck() (probe.Result, string, error) {
prober, err := factory.CreateProber(server.Config)
if err != nil {
return probe.Failure, "", err
}
defer prober.Close()
ctx, cancel := context.WithTimeout(context.Background(), probeTimeOut)
defer cancel()
err = prober.Probe(ctx)
if err != nil {
return probe.Failure, "", err
}
return probe.Success, "", err
}