Serge Bazanski | de0330a | 2020-07-30 20:48:48 +0200 | [diff] [blame] | 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "flag" |
| 6 | "fmt" |
| 7 | "html/template" |
| 8 | "net" |
| 9 | "net/http" |
| 10 | "math/rand" |
| 11 | "strings" |
| 12 | "time" |
| 13 | |
| 14 | "github.com/golang/glog" |
| 15 | |
| 16 | mirko "code.hackerspace.pl/hscloud/go/mirko" |
| 17 | "code.hackerspace.pl/hscloud/hswaw/laserproxy/tpl" |
| 18 | ) |
| 19 | |
| 20 | var ( |
| 21 | flagLaserAddress = "10.11.0.10" |
| 22 | flagLaserNetworkAddress = "10.11.0.1" |
| 23 | flagClientNetworkAddress = "10.8.1.2" |
| 24 | flagWebAddress = "127.0.0.1:8080" |
| 25 | |
| 26 | tplIndex = template.Must(template.New("index.html").Parse(tpl.MustAssetString("index.html"))) |
| 27 | ) |
| 28 | |
| 29 | type service struct { |
| 30 | lockCtrl chan *lockCtrl |
| 31 | } |
| 32 | |
| 33 | func main() { |
| 34 | flag.StringVar(&flagLaserAddress, "laser_address", flagLaserAddress, "Address of Ruida controller on laser network") |
| 35 | flag.StringVar(&flagLaserNetworkAddress, "laser_network", flagLaserNetworkAddress, "Address of proxy on laser network") |
| 36 | flag.StringVar(&flagClientNetworkAddress, "client_network", flagClientNetworkAddress, "Address of proxy on client network") |
| 37 | flag.StringVar(&flagWebAddress, "web_address", flagWebAddress, "Address and port to listen on for public web connections") |
| 38 | |
| 39 | flag.Parse() |
| 40 | m := mirko.New() |
| 41 | if err := m.Listen(); err != nil { |
| 42 | glog.Exitf("Could not listen: %v", err) |
| 43 | } |
| 44 | |
| 45 | lisLaser, err := net.ListenPacket("udp", fmt.Sprintf("%s:40200", flagLaserNetworkAddress)) |
| 46 | if err != nil { |
| 47 | glog.Fatalf("could not listen on laser network: %v", err) |
| 48 | } |
| 49 | defer lisLaser.Close() |
| 50 | |
| 51 | lisClient, err := net.ListenPacket("udp", fmt.Sprintf("%s:50200", flagClientNetworkAddress)) |
| 52 | if err != nil { |
| 53 | glog.Fatalf("could not listen on client network: %v", err) |
| 54 | } |
| 55 | defer lisClient.Close() |
| 56 | |
| 57 | laserIP := net.ParseIP(flagLaserAddress) |
| 58 | if laserIP == nil { |
| 59 | glog.Fatalf("could not parse laser IP address %q", flagLaserAddress) |
| 60 | } |
| 61 | laserAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:50200", laserIP.String())) |
| 62 | if err != nil { |
| 63 | glog.Fatalf("could not make laser UDP address: %v", err) |
| 64 | } |
| 65 | |
| 66 | ctx := m.Context() |
| 67 | s := &service{ |
| 68 | lockCtrl: make(chan *lockCtrl), |
| 69 | } |
| 70 | updates := make(chan *lockUpdate) |
| 71 | go s.runProxy(ctx, updates, laserAddr, lisLaser, lisClient) |
| 72 | go s.runLocker(ctx, s.lockCtrl) |
| 73 | s.lockCtrl <- &lockCtrl{ |
| 74 | subscribe: &lockCtrlSubscribe{ |
| 75 | subscriber: updates, |
| 76 | }, |
| 77 | } |
| 78 | |
| 79 | mux := http.NewServeMux() |
| 80 | mux.HandleFunc("/", s.handlerIndex) |
| 81 | mux.HandleFunc("/take", s.handlerTake) |
| 82 | mux.HandleFunc("/release", s.handlerRelease) |
| 83 | mux.HandleFunc("/force", s.handlerForce) |
| 84 | httpSrv := &http.Server{Addr: flagWebAddress, Handler: mux} |
| 85 | |
| 86 | glog.Infof("Listening for web connections on %q...", flagWebAddress) |
| 87 | go func() { |
| 88 | if err := httpSrv.ListenAndServe(); err != nil { |
| 89 | glog.Error(err) |
| 90 | } |
| 91 | }() |
| 92 | |
| 93 | if err := m.Serve(); err != nil { |
| 94 | glog.Exitf("Could not run: %v", err) |
| 95 | } |
| 96 | |
| 97 | glog.Info("Running.") |
| 98 | <-m.Done() |
| 99 | ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) |
| 100 | defer cancel() |
| 101 | httpSrv.Shutdown(ctx) |
| 102 | } |
| 103 | |
| 104 | var ( |
| 105 | sampleNames = []string{ |
| 106 | "enleth", "radex", "qdot", "hans acker", "makłowicz", |
| 107 | } |
| 108 | ) |
| 109 | |
| 110 | func remoteAddr(r *http.Request) string { |
| 111 | if fwd := r.Header.Get("X-Forwarded-For"); fwd != "" { |
| 112 | return strings.Split(fwd, ":")[0] |
| 113 | } |
| 114 | return strings.Split(r.RemoteAddr, ":")[0] |
| 115 | } |
| 116 | |
| 117 | func (s *service) handlerIndex(w http.ResponseWriter, r *http.Request) { |
| 118 | res := make(chan *lockResCurrent) |
| 119 | s.lockCtrl <- &lockCtrl{ |
| 120 | getCurrent: &lockCtrlGetCurrent{ |
| 121 | res: res, |
| 122 | }, |
| 123 | } |
| 124 | cur := <-res |
| 125 | |
| 126 | err := tplIndex.Execute(w, struct { |
| 127 | You bool |
| 128 | CurrentAddress string |
| 129 | CurrentNote string |
| 130 | CurrentDeadline string |
| 131 | SampleName string |
| 132 | }{ |
| 133 | You: cur.addr == remoteAddr(r), |
| 134 | CurrentAddress: cur.addr, |
| 135 | CurrentNote: cur.note, |
| 136 | CurrentDeadline: fmt.Sprintf("%d minute(s)", int(cur.deadline.Sub(time.Now()).Minutes())), |
| 137 | SampleName: sampleNames[rand.Intn(len(sampleNames))], |
| 138 | }) |
| 139 | if err != nil { |
| 140 | glog.Errorf("rendering template: %v", err) |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | func (s *service) handlerTake(w http.ResponseWriter, r *http.Request) { |
| 145 | if r.Method != "POST" { |
| 146 | return |
| 147 | } |
| 148 | r.ParseForm() |
| 149 | who := r.Form.Get("who") |
| 150 | prev := r.Form.Get("prev") |
| 151 | if who == "" { |
| 152 | fmt.Fprintf(w, "sorry, who are you? please specify a name") |
| 153 | return |
| 154 | } |
| 155 | |
| 156 | res := make(chan bool) |
| 157 | take := &lockCtrlTake{ |
| 158 | note: who, |
| 159 | addr: remoteAddr(r), |
| 160 | prev: prev, |
| 161 | res: res, |
| 162 | } |
| 163 | s.lockCtrl <- &lockCtrl{ |
| 164 | take: take, |
| 165 | } |
| 166 | won := <-res |
| 167 | |
| 168 | if won { |
| 169 | http.Redirect(w, r, "/", 302) |
| 170 | } else { |
| 171 | fmt.Fprintf(w, "lock not taken") |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | func (s *service) handlerRelease(w http.ResponseWriter, r *http.Request) { |
| 176 | if r.Method != "POST" { |
| 177 | return |
| 178 | } |
| 179 | res := make(chan struct{}) |
| 180 | s.lockCtrl <- &lockCtrl{ |
| 181 | release: &lockCtrlRelease{ |
| 182 | addr: remoteAddr(r), |
| 183 | res: res, |
| 184 | }, |
| 185 | } |
| 186 | <-res |
| 187 | |
| 188 | http.Redirect(w, r, "/", 302) |
| 189 | } |
| 190 | |
| 191 | func (s *service) handlerForce(w http.ResponseWriter, r *http.Request) { |
| 192 | if r.Method != "POST" { |
| 193 | return |
| 194 | } |
| 195 | res := make(chan struct{}) |
| 196 | s.lockCtrl <- &lockCtrl{ |
| 197 | release: &lockCtrlRelease{ |
| 198 | force: true, |
| 199 | res: res, |
| 200 | }, |
| 201 | } |
| 202 | <-res |
| 203 | |
| 204 | http.Redirect(w, r, "/", 302) |
| 205 | } |