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135 lines
2.8 KiB
Go
135 lines
2.8 KiB
Go
/*
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Copyright 2017 The KUAR Authors
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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 debugprobe
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"sync"
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"time"
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"github.com/julienschmidt/httprouter"
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"github.com/kubernetes-up-and-running/kuard/pkg/apiutils"
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"github.com/kubernetes-up-and-running/kuard/pkg/htmlutils"
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)
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const maxHistory = 20
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type Probe struct {
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basePath string
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mu sync.Mutex
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lastID int
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c ProbeConfig
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history []*ProbeHistory
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}
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type ProbeHistory struct {
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ID int
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When time.Time
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Code int
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}
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func New() *Probe {
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return &Probe{}
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}
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func (p *Probe) AddRoutes(r *httprouter.Router, base string) {
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r.GET(base, p.Handle)
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r.GET(base+"/api", p.APIGet)
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r.PUT(base+"/api", p.APIPut)
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if p.basePath != "" {
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p.basePath = base
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}
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}
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func (p *Probe) APIGet(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.lockedGet(w, r)
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}
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func (p *Probe) lockedGet(w http.ResponseWriter, r *http.Request) {
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s := &ProbeStatus{
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ProbePath: p.basePath,
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FailNext: p.c.FailNext,
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}
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l := len(p.history)
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s.History = make([]ProbeStatusHistory, l)
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for i, v := range p.history {
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h := &s.History[l-1-i]
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h.ID = v.ID
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h.When = htmlutils.FriendlyTime(v.When)
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h.RelWhen = htmlutils.RelativeTime(v.When)
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h.Code = v.Code
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}
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apiutils.ServeJSON(w, s)
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}
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func (p *Probe) APIPut(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
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c := ProbeConfig{}
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err := json.NewDecoder(r.Body).Decode(&c)
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if err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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p.SetConfig(c)
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p.APIGet(w, r, params)
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}
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func (p *Probe) Handle(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
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p.mu.Lock()
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defer p.mu.Unlock()
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status := http.StatusOK
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message := "ok"
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if p.c.FailNext > 0 {
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status = http.StatusInternalServerError
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p.c.FailNext--
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message = fmt.Sprintf("fail, %d left", p.c.FailNext)
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} else if p.c.FailNext < 0 {
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status = http.StatusInternalServerError
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message = "fail, permanent"
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}
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w.Header().Set("Content-Type", "text/plain")
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w.WriteHeader(status)
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w.Write([]byte(message))
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p.recordRequest(r, status)
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}
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func (p *Probe) recordRequest(_ *http.Request, code int) {
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p.lastID++
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entry := &ProbeHistory{
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ID: p.lastID,
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When: time.Now(),
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Code: code,
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}
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p.history = append(p.history, entry)
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if len(p.history) > maxHistory {
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p.history = p.history[len(p.history)-maxHistory:]
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}
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}
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