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server.go
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server.go
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// Copyright 2018 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package sos
import (
"encoding/json"
"fmt"
"html/template"
"io/ioutil"
"log"
"net/http"
"path/filepath"
"github.com/gorilla/mux"
)
const (
PortNum = "8000"
DefHtmlPage = `
<head>
<style>
table {
font-family: arial, sans-serif;
border-collapse: collapse;
width: 100%;
}
td, th {
border: 1px solid #dddddd;
text-align: left;
padding: 8px;
}
</style>
<script>
</script>
</head>
<body>
<h1>Current Services (html embedded)</h1>
<table style="width:100%">
<tr>
<th>Service</th>
<th>Port Number</th>
<th></th>
</tr>
{{range $key, $value := .}}
<tr>
<td>{{$key}}</td>
<td>{{$value}}</td>
<td><a href="http://localhost:{{$value}}" target="_blank">Go there!</td>
</tr>
{{else}}
<tr>
<td colspan="3" style="text-align:center">No services</td>
</tr>
{{end}}
</table>
</body>
`
)
// default path
var htmlRoot = "/etc/sos/html"
type SosServer struct {
service *SosService
}
type RegisterReqJson struct {
Service string
Port uint
}
// set htmlRoot var to array of dirs p
func SetHTMLRoot(p ...string) {
if len(p) > 0 {
htmlRoot = filepath.Join(p...)
}
}
// HTMLPath returns the HTMLPath formed by joining the arguments together.
// If there are no arguments, it simply returns the HTML root directory.
func HTMLPath(n ...string) string {
return filepath.Join(htmlRoot, filepath.Join(n...))
}
func (s SosServer) registerHandle(w http.ResponseWriter, r *http.Request) {
var msg RegisterReqJson
decoder := json.NewDecoder(r.Body)
defer r.Body.Close()
if err := decoder.Decode(&msg); err != nil {
log.Printf("error: %v", err)
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(struct{ Error string }{err.Error()})
return
}
if err := s.service.Register(msg.Service, msg.Port); err != nil {
log.Printf("error: %v", err)
w.WriteHeader(http.StatusInternalServerError)
json.NewEncoder(w).Encode(struct{ Error string }{err.Error()})
return
}
json.NewEncoder(w).Encode(nil)
}
type UnRegisterReqJson struct {
ServiceName string
}
func (s SosServer) unregisterHandle(w http.ResponseWriter, r *http.Request) {
var msg UnRegisterReqJson
decoder := json.NewDecoder(r.Body)
defer r.Body.Close()
if err := decoder.Decode(&msg); err != nil {
log.Printf("error: %v", err)
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(struct{ Error string }{err.Error()})
return
}
s.service.Unregister(msg.ServiceName)
json.NewEncoder(w).Encode(nil)
}
type GetServiceResJson struct {
Port uint
}
func (s SosServer) getServiceHandle(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
port, err := s.service.Read(vars["service"])
if err != nil {
log.Printf("error: %v", err)
w.WriteHeader(http.StatusNotFound)
json.NewEncoder(w).Encode(struct{ Error string }{err.Error()})
return
}
json.NewEncoder(w).Encode(GetServiceResJson{port})
}
func (s SosServer) redirectToResourceHandle(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
port, err := s.service.Read(vars["service"])
if err != nil {
log.Printf("error: %v", err)
w.WriteHeader(http.StatusNotFound)
json.NewEncoder(w).Encode(struct{ Error string }{err.Error()})
return
}
http.Redirect(w, r, fmt.Sprintf("http://localhost:%v/", port), http.StatusTemporaryRedirect)
}
func (s SosServer) displaySosHandle(w http.ResponseWriter, r *http.Request) {
snap := s.service.SnapshotRegistry()
var tmpl *template.Template
file, err := ioutil.ReadFile(HTMLPath("sos.html"))
if err == nil {
html := string(file)
tmpl = template.Must(template.New("SoS").Parse(html))
} else {
tmpl = template.Must(template.New("SoS").Parse(DefHtmlPage))
}
tmpl.Execute(w, snap)
}
func (s SosServer) buildRouter() http.Handler {
r := mux.NewRouter()
r.HandleFunc("/", s.displaySosHandle).Methods("GET")
r.HandleFunc("/register", s.registerHandle).Methods("POST")
r.HandleFunc("/unregister", s.unregisterHandle).Methods("POST")
r.HandleFunc("/service/{service}", s.getServiceHandle).Methods("GET")
r.HandleFunc("/go/{service}", s.redirectToResourceHandle).Methods("GET")
r.PathPrefix("/css/").Handler(http.StripPrefix("/css/", http.FileServer(http.Dir(HTMLPath("css")))))
return r
}
func StartServer(service *SosService) {
server := SosServer{service}
fmt.Println(http.ListenAndServe(fmt.Sprintf(":%s", PortNum), server.buildRouter()))
}